diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index c43dfbffa6..9e83fdc897 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -25,20 +25,20 @@ jobs:
                 options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3
 
         steps:
-            -  name: Checkout
-               uses: actions/checkout@v1
+            - name: Checkout
+              uses: actions/checkout@v1
 
-            -  name: Setup PHP Action
-               uses: shivammathur/setup-php@1.6.1
-               with:
-                   php-version: ${{ matrix.php-versions }}
-                   extensions: mbstring, xml, ctype, iconv, mysql, gd, soap, intl, zip, bcmath
+            - name: Setup PHP Action
+              uses: shivammathur/setup-php@1.6.1
+              with:
+                php-version: ${{ matrix.php-versions }}
+                extensions: mbstring, xml, ctype, iconv, mysql, gd, soap, intl, zip, bcmath
 
-            -  name: Install dependencies
-               run: composer install --prefer-dist --no-progress --no-suggest
+            - name: Install dependencies
+              run: composer install --prefer-dist --no-progress --no-suggest
 
-            -  name: Composer analyse
-               run: composer analyse
+            - name: Composer analyse
+              run: composer analyse
 
         # Add a test script to composer.json, for instance: "test": "vendor/bin/phpunit"
         # Docs: https://getcomposer.org/doc/articles/scripts.md
diff --git a/public/main/admin/access_url_add_courses_to_url.php b/public/main/admin/access_url_add_courses_to_url.php
index 6ed564b431..d19d829110 100644
--- a/public/main/admin/access_url_add_courses_to_url.php
+++ b/public/main/admin/access_url_add_courses_to_url.php
@@ -5,7 +5,6 @@
  * It displays a list of users and a list of courses;
  * you can select multiple users and courses and then click on.
  *
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
diff --git a/public/main/admin/access_url_add_usergroup_to_url.php b/public/main/admin/access_url_add_usergroup_to_url.php
index 90186a5a1a..dfc47bc045 100644
--- a/public/main/admin/access_url_add_usergroup_to_url.php
+++ b/public/main/admin/access_url_add_usergroup_to_url.php
@@ -5,7 +5,6 @@
  *  It displays a list of users and a list of courses;
  *  you can select multiple users and courses and then click on.
  *
- *
  *  @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
diff --git a/public/main/admin/access_url_add_users_to_url.php b/public/main/admin/access_url_add_users_to_url.php
index bf9f8766d5..2f34824601 100644
--- a/public/main/admin/access_url_add_users_to_url.php
+++ b/public/main/admin/access_url_add_users_to_url.php
@@ -5,7 +5,6 @@
  *    It displays a list of users and a list of courses;
  *    you can select multiple users and courses and then click on.
  *
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
diff --git a/public/main/admin/access_url_edit_users_to_url.php b/public/main/admin/access_url_edit_users_to_url.php
index c43b227472..f0fe915a51 100644
--- a/public/main/admin/access_url_edit_users_to_url.php
+++ b/public/main/admin/access_url_edit_users_to_url.php
@@ -98,7 +98,7 @@ if (isset($_POST['form_sent']) && $_POST['form_sent']) {
                     $user_info = api_get_user_info($user);
                     if (!empty($user_info)) {
                         $user_added_list[] = $i.'. '.api_get_person_name($user_info['firstname'], $user_info['lastname'], null, null, null, $user_info['username']);
-                        ++$i;
+                        $i++;
                     }
                 }
                 if (!empty($user_added_list)) {
@@ -114,7 +114,7 @@ if (isset($_POST['form_sent']) && $_POST['form_sent']) {
                     $user_info = api_get_user_info($user);
                     if (!empty($user_info)) {
                         $user_deleted_list[] = $i.'. '.api_get_person_name($user_info['firstname'], $user_info['lastname']);
-                        ++$i;
+                        $i++;
                     }
                 }
                 if (!empty($user_deleted_list)) {
diff --git a/public/main/admin/access_urls.php b/public/main/admin/access_urls.php
index 1dc3aaa856..728a3049e4 100644
--- a/public/main/admin/access_urls.php
+++ b/public/main/admin/access_urls.php
@@ -5,7 +5,6 @@
 /**
  * Frontend script for multiple access urls.
  *
- *
  * @author Julio Montoya <gugli100@gmail.com>
  * @author Yannick Warnier <yannick.warnier@beeznest.com>
  */
diff --git a/public/main/admin/add_users_to_usergroup.php b/public/main/admin/add_users_to_usergroup.php
index bcbe9c5c08..efcf642b6d 100644
--- a/public/main/admin/add_users_to_usergroup.php
+++ b/public/main/admin/add_users_to_usergroup.php
@@ -169,7 +169,7 @@ if (is_array($extra_field_list)) {
 if ($use_extra_fields) {
     $final_result = [];
     if (count($extra_field_result) > 1) {
-        for ($i = 0; $i < count($extra_field_result) - 1; ++$i) {
+        for ($i = 0; $i < count($extra_field_result) - 1; $i++) {
             if (is_array($extra_field_result[$i + 1])) {
                 $final_result = array_intersect($extra_field_result[$i], $extra_field_result[$i + 1]);
             }
diff --git a/public/main/admin/course_request_accepted.php b/public/main/admin/course_request_accepted.php
index fa2b0747c7..e468b2317a 100644
--- a/public/main/admin/course_request_accepted.php
+++ b/public/main/admin/course_request_accepted.php
@@ -5,7 +5,6 @@
 /**
  * A list containig the accepted course requests.
  *
- *
  * @author José Manuel Abuin Mosquera <chema@cesga.es>, 2010
  * @author Bruno Rubio Gayo <brubio@cesga.es>, 2010
  * Centro de Supercomputacion de Galicia (CESGA)
diff --git a/public/main/admin/course_request_edit.php b/public/main/admin/course_request_edit.php
index 3229661aed..06521521d0 100644
--- a/public/main/admin/course_request_edit.php
+++ b/public/main/admin/course_request_edit.php
@@ -5,7 +5,6 @@
 /**
  * A page for detailed preview or edition of a given course request.
  *
- *
  * @author Ivan Tcholakov <ivantcholakov@gmail.com>, 2010
  */
 $cidReset = true;
diff --git a/public/main/admin/course_request_rejected.php b/public/main/admin/course_request_rejected.php
index 793c80fcba..b9e91335fe 100644
--- a/public/main/admin/course_request_rejected.php
+++ b/public/main/admin/course_request_rejected.php
@@ -5,7 +5,6 @@
 /**
  * A list containing the rejected course requests.
  *
- *
  * @author José Manuel Abuin Mosquera <chema@cesga.es>, 2010
  * @author Bruno Rubio Gayo <brubio@cesga.es>, 2010
  * Centro de Supercomputacion de Galicia (CESGA)
diff --git a/public/main/admin/course_request_review.php b/public/main/admin/course_request_review.php
index 7c05a3802f..3f3e364961 100644
--- a/public/main/admin/course_request_review.php
+++ b/public/main/admin/course_request_review.php
@@ -5,7 +5,6 @@
 /**
  * A list containing the pending course requests.
  *
- *
  * @author José Manuel Abuin Mosquera <chema@cesga.es>, 2010
  * Centro de Supercomputacion de Galicia (CESGA)
  * @author Ivan Tcholakov <ivantcholakov@gmail.com> (technical adaptation for Chamilo 1.8.8), 2010
diff --git a/public/main/admin/dashboard_add_users_to_user.php b/public/main/admin/dashboard_add_users_to_user.php
index a32e8b4cd1..2aae315f90 100644
--- a/public/main/admin/dashboard_add_users_to_user.php
+++ b/public/main/admin/dashboard_add_users_to_user.php
@@ -153,7 +153,7 @@ function search_users($needle, $type = 'multiple')
             $rs = Database::query($sql);
             $i = 0;
             while ($user = Database :: fetch_array($rs)) {
-                ++$i;
+                $i++;
                 if ($i <= 10) {
                     $person_name = api_get_person_name($user['firstname'], $user['lastname']);
                     $return .= '<a href="javascript: void(0);" onclick="javascript: add_user_to_user(\''.$user['user_id'].'\',\''.$person_name.' ('.$user['username'].')'.'\')">'.$person_name.' ('.$user['username'].')</a><br />';
diff --git a/public/main/admin/email_tester.php b/public/main/admin/email_tester.php
index 7a7f78a503..14e77dfb38 100644
--- a/public/main/admin/email_tester.php
+++ b/public/main/admin/email_tester.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Index page of the admin tools.
- *
- * @package chamilo.admin
  */
 // Resetting the course id.
 $cidReset = true;
diff --git a/public/main/admin/export_certificates.php b/public/main/admin/export_certificates.php
index 34aeeba24d..6d37fdb605 100644
--- a/public/main/admin/export_certificates.php
+++ b/public/main/admin/export_certificates.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 Display::display_header(null);
diff --git a/public/main/admin/extra_field_options.php b/public/main/admin/extra_field_options.php
index d9bbe9e411..9c34063f33 100644
--- a/public/main/admin/extra_field_options.php
+++ b/public/main/admin/extra_field_options.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -36,7 +33,7 @@ $extra_field_info = $extra_field->get($field_id);
 $check = Security::check_token('request');
 $token = Security::get_token();
 
-if ($action == 'add') {
+if ('add' == $action) {
     $interbreadcrumb[] = ['url' => 'extra_fields.php?type='.$extra_field->type, 'name' => $extra_field->pageName];
     $interbreadcrumb[] = [
         'url' => 'extra_fields.php?type='.$extra_field->type.'&action=edit&id='.$extra_field_info['id'],
@@ -47,7 +44,7 @@ if ($action == 'add') {
         'name' => get_lang('Edit extra field options'),
     ];
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Add')];
-} elseif ($action == 'edit') {
+} elseif ('edit' == $action) {
     $interbreadcrumb[] = ['url' => 'extra_fields.php?type='.$extra_field->type, 'name' => $extra_field->pageName];
     $interbreadcrumb[] = [
         'url' => 'extra_fields.php?type='.$extra_field->type.'&action=edit&id='.$extra_field_info['id'],
@@ -148,7 +145,7 @@ $obj->fieldId = $field_id;
 // Action handling: Add
 switch ($action) {
     case 'add':
-        if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+        if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
             api_not_allowed();
         }
         $url = api_get_self().'?action='.Security::remove_XSS($_GET['action']).'&'.$params;
diff --git a/public/main/admin/extra_field_workflow.php b/public/main/admin/extra_field_workflow.php
index 28e9f27f8a..467a696206 100644
--- a/public/main/admin/extra_field_workflow.php
+++ b/public/main/admin/extra_field_workflow.php
@@ -3,9 +3,6 @@
 
 use Chamilo\CoreBundle\Entity\ExtraFieldOptionRelFieldOption;
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -35,7 +32,7 @@ $extraFieldInfo = $extraField->get($field_id);
 $check = Security::check_token('request');
 $token = Security::get_token();
 
-if ($action == 'add') {
+if ('add' == $action) {
     $interbreadcrumb[] = ['url' => 'extra_fields.php?type='.$extraField->type, 'name' => $extraField->pageName];
     $interbreadcrumb[] = [
         'url' => 'extra_fields.php?type='.$extraField->type.'&action=edit&id='.$extraFieldInfo['id'],
@@ -46,7 +43,7 @@ if ($action == 'add') {
         'name' => get_lang('Edit extra field options'),
     ];
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Add')];
-} elseif ($action == 'edit') {
+} elseif ('edit' == $action) {
     $interbreadcrumb[] = [
         'url' => 'extra_fields.php?type='.$extraField->type,
         'name' => $extraField->pageName,
@@ -234,7 +231,7 @@ if ($form->validate()) {
                     ]
                 );
 
-                if ($value == 1) {
+                if (1 == $value) {
                     if (empty($extraFieldOptionRelFieldOption)) {
                         $extraFieldOptionRelFieldOption = new ExtraFieldOptionRelFieldOption();
                         $extraFieldOptionRelFieldOption
diff --git a/public/main/admin/extra_fields.php b/public/main/admin/extra_fields.php
index 33582f7f69..aa1cde0c3f 100644
--- a/public/main/admin/extra_fields.php
+++ b/public/main/admin/extra_fields.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
@@ -112,7 +109,7 @@ Display::display_header($tool_name);
 // Action handling: Add
 switch ($action) {
     case 'add':
-        if (api_get_session_id() != 0 &&
+        if (0 != api_get_session_id() &&
             !api_is_allowed_to_session_edit(false, true)
         ) {
             api_not_allowed();
diff --git a/public/main/admin/filler.php b/public/main/admin/filler.php
index c3fa0748b3..f7d396425d 100644
--- a/public/main/admin/filler.php
+++ b/public/main/admin/filler.php
@@ -3,8 +3,6 @@
 
 /**
  * Index of the admin tools.
- *
- * @package chamilo.admin
  */
 
 // resetting the course id
diff --git a/public/main/admin/grade_models.php b/public/main/admin/grade_models.php
index 54fbfbcd1a..4e52c108c3 100644
--- a/public/main/admin/grade_models.php
+++ b/public/main/admin/grade_models.php
@@ -8,7 +8,7 @@ $this_section = SECTION_PLATFORM_ADMIN;
 
 api_protect_admin_script();
 
-if (api_get_setting('gradebook_enable_grade_model') != 'true') {
+if ('true' != api_get_setting('gradebook_enable_grade_model')) {
     api_not_allowed(true);
 }
 
@@ -23,10 +23,10 @@ $action = isset($_GET['action']) ? $_GET['action'] : null;
 $check = Security::check_token('request');
 $token = Security::get_token();
 
-if ($action === 'add') {
+if ('add' === $action) {
     $interbreadcrumb[] = ['url' => 'grade_models.php', 'name' => get_lang('Grading model')];
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Add')];
-} elseif ($action == 'edit') {
+} elseif ('edit' == $action) {
     $interbreadcrumb[] = ['url' => 'grade_models.php', 'name' => get_lang('Grading model')];
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Edit')];
 } else {
@@ -136,7 +136,7 @@ $obj = new GradeModel();
 // Action handling: Add
 switch ($action) {
     case 'add':
-        if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+        if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
             api_not_allowed();
         }
 
diff --git a/public/main/admin/gradebook_dependency.php b/public/main/admin/gradebook_dependency.php
index 4eab16f3ce..419c929699 100644
--- a/public/main/admin/gradebook_dependency.php
+++ b/public/main/admin/gradebook_dependency.php
@@ -8,7 +8,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 api_protect_admin_script();
 
 $allow = api_get_configuration_value('gradebook_dependency');
-if ($allow == false) {
+if (false == $allow) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/admin/gradebook_list.php b/public/main/admin/gradebook_list.php
index c2ca71510b..0d8e1e1628 100644
--- a/public/main/admin/gradebook_list.php
+++ b/public/main/admin/gradebook_list.php
@@ -10,7 +10,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 api_protect_admin_script();
 
 $allow = api_get_configuration_value('gradebook_dependency');
-if ($allow == false) {
+if (false == $allow) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/admin/index.php b/public/main/admin/index.php
index 9b29fb9e19..76644d4c0a 100644
--- a/public/main/admin/index.php
+++ b/public/main/admin/index.php
@@ -7,8 +7,6 @@ use League\Flysystem\Filesystem;
 
 /**
  * Index page of the admin tools.
- *
- * @package chamilo.admin
  */
 // Resetting the course id.
 $cidReset = true;
@@ -162,7 +160,7 @@ if (api_is_platform_admin()) {
     $items[] = ['url' => 'course_list.php', 'label' => get_lang('Course list')];
     $items[] = ['url' => 'course_add.php', 'label' => get_lang('Add course')];
 
-    if (api_get_setting('course_validation') == 'true') {
+    if ('true' == api_get_setting('course_validation')) {
         $items[] = ['url' => 'course_request_review.php', 'label' => get_lang('Review incoming course requests')];
         $items[] = ['url' => 'course_request_accepted.php', 'label' => get_lang('Accepted course requests')];
         $items[] = ['url' => 'course_request_rejected.php', 'label' => get_lang('Rejected course requests')];
@@ -174,7 +172,7 @@ if (api_is_platform_admin()) {
     $items[] = ['url' => 'subscribe_user2course.php', 'label' => get_lang('Add a user to a course')];
     $items[] = ['url' => 'course_user_import.php', 'label' => get_lang('Import users list')];
 
-    if (api_get_setting('gradebook_enable_grade_model') == 'true') {
+    if ('true' == api_get_setting('gradebook_enable_grade_model')) {
         $items[] = ['url' => 'grade_models.php', 'label' => get_lang('Grading model')];
     }
 
@@ -381,14 +379,14 @@ if (api_is_platform_admin()) {
         }
     }
 
-    if (api_get_plugin_setting('dictionary', 'enable_plugin_dictionary') == 'true') {
+    if ('true' == api_get_plugin_setting('dictionary', 'enable_plugin_dictionary')) {
         $items[] = [
             'url' => api_get_path(WEB_PLUGIN_PATH).'dictionary/terms.php',
             'label' => get_lang('Dictionary'),
         ];
     }
 
-    if (api_get_setting('allow_terms_conditions') == 'true') {
+    if ('true' == api_get_setting('allow_terms_conditions')) {
         $items[] = ['url' => 'legal_add.php', 'label' => get_lang('Terms and Conditions')];
     }
 
@@ -452,7 +450,7 @@ if (api_is_platform_admin()) {
         'label' => get_lang('Tickets'),
     ];
 
-    if (api_get_configuration_value('db_manager_enabled') == true &&
+    if (true == api_get_configuration_value('db_manager_enabled') &&
         api_is_global_platform_admin()
     ) {
         $host = $_configuration['db_host'];
@@ -601,7 +599,7 @@ $tpl = new Template();
 
 // Display the Site Use Cookie Warning Validation
 $useCookieValidation = api_get_setting('cookie_warning');
-if ($useCookieValidation === 'true') {
+if ('true' === $useCookieValidation) {
     if (isset($_POST['acceptCookies'])) {
         api_set_site_use_cookie_warning_cookie();
     } elseif (!api_site_use_cookie_warning_cookie_exist()) {
diff --git a/public/main/admin/languages.php b/public/main/admin/languages.php
index aba7509c66..a333210aa9 100644
--- a/public/main/admin/languages.php
+++ b/public/main/admin/languages.php
@@ -27,9 +27,9 @@ $action = isset($_GET['action']) ? $_GET['action'] : null;
 //Ajax request
 if (isset($_POST['sent_http_request'])) {
     if (isset($_POST['visibility']) &&
-        $_POST['visibility'] == strval(intval($_POST['visibility'])) && $_POST['visibility'] == 0) {
+        $_POST['visibility'] == strval(intval($_POST['visibility'])) && 0 == $_POST['visibility']) {
         if (isset($_POST['id']) && $_POST['id'] == strval(intval($_POST['id']))) {
-            if (SubLanguageManager::check_if_language_is_used($_POST['id']) == false) {
+            if (false == SubLanguageManager::check_if_language_is_used($_POST['id'])) {
                 SubLanguageManager::make_unavailable_language($_POST['id']);
                 echo 'set_hidden';
             } else {
@@ -38,7 +38,7 @@ if (isset($_POST['sent_http_request'])) {
         }
     }
     if (isset($_POST['visibility']) &&
-        $_POST['visibility'] == strval(intval($_POST['visibility'])) && $_POST['visibility'] == 1
+        $_POST['visibility'] == strval(intval($_POST['visibility'])) && 1 == $_POST['visibility']
     ) {
         if (isset($_POST['id']) && $_POST['id'] == strval(intval($_POST['id']))) {
             SubLanguageManager::make_available_language($_POST['id']);
@@ -186,7 +186,7 @@ switch ($action) {
         $failedDisabledLanguages = '';
         $checkFailed = false;
         foreach ($allLanguages as $language) {
-            if (SubLanguageManager::check_if_language_is_used($language['id']) == false) {
+            if (false == SubLanguageManager::check_if_language_is_used($language['id'])) {
                 SubLanguageManager::make_unavailable_language($language['id']);
             } else {
                 if (intval(SubLanguageManager::get_platform_language_id()) !== intval($language['id'])) {
@@ -205,7 +205,7 @@ switch ($action) {
         break;
     case 'make_unavailable_confirmed':
         $language_info = SubLanguageManager::get_all_information_of_language($id);
-        if ($language_info['available'] == 1) {
+        if (1 == $language_info['available']) {
             SubLanguageManager::make_unavailable_language($id);
             $platform_language = api_get_setting('platformLanguage');
             UserManager::update_all_user_languages($language_info['english_name'], $platform_language);
@@ -224,7 +224,7 @@ if (isset($_POST['Submit']) && $_POST['Submit']) {
             WHERE id='$postId'";
     $result = Database::query($sql);
     // changing the Platform language
-    if ($_POST['platformlanguage'] && $_POST['platformlanguage'] != '') {
+    if ($_POST['platformlanguage'] && '' != $_POST['platformlanguage']) {
         api_set_setting('platformLanguage', $_POST['platformlanguage'], null, null, api_get_current_access_url_id());
         header("Location: $url");
         exit;
@@ -285,7 +285,7 @@ while ($row = Database::fetch_array($result_select)) {
     $row_td[] = $row['id'];
     $checked = '';
     // the first column is the original name of the language OR a form containing the original name
-    if ($action == 'edit' && $row['id'] == $id) {
+    if ('edit' == $action && $row['id'] == $id) {
         if ($row['english_name'] == api_get_setting('platformLanguage')) {
             $checked = ' checked="checked" ';
         }
@@ -321,13 +321,13 @@ while ($row = Database::fetch_array($result_select)) {
     $allow_add_term_sub_language = null;
     $allow_use_sub_language = '';
     $allow_add_term_sub_language = '';
-    if (api_get_setting('allow_use_sub_language') === 'true') {
+    if ('true' === api_get_setting('allow_use_sub_language')) {
         $verified_if_is_sub_language = SubLanguageManager::check_if_language_is_sub_language($row['id']);
-        if ($verified_if_is_sub_language === false) {
+        if (false === $verified_if_is_sub_language) {
             $verified_if_is_father = SubLanguageManager::check_if_language_is_father($row['id']);
             $allow_use_sub_language = "&nbsp;<a href='sub_language_add.php?action=definenewsublanguage&id=".$row['id']."'>".
                 Display::return_icon('new_language.png', get_lang('Create sub-language'), [], ICON_SIZE_SMALL)."</a>";
-            if ($verified_if_is_father === true) {
+            if (true === $verified_if_is_father) {
                 $allow_add_term_sub_language = '';
             } else {
                 $allow_add_term_sub_language = '';
@@ -346,7 +346,7 @@ while ($row = Database::fetch_array($result_select)) {
             Display::return_icon('edit.png', get_lang('Edit'), '', ICON_SIZE_SMALL)."</a>
                      &nbsp;".$setplatformlanguage.$allow_use_sub_language.$allow_add_term_sub_language.$allow_delete_sub_language;
     } else {
-        if ($row['available'] == 1) {
+        if (1 == $row['available']) {
             $row_td[] = "<a class=\"make_visible_and_invisible\" id=\"linktool_".$row['id']."\" href='".api_get_self()."?action=makeunavailable&id=".$row['id']."'>".
                 Display::return_icon('visible.png', get_lang('Make unavailable'), ['id' => 'imglinktool_'.$row['id']], ICON_SIZE_SMALL)."</a> <a href='".api_get_self()."?action=edit&id=".$row['id']."#value'>".Display::return_icon('edit.png', get_lang('Edit'), '', ICON_SIZE_SMALL)."</a>&nbsp;".$setplatformlanguage.$allow_use_sub_language.$allow_add_term_sub_language.$allow_delete_sub_language;
         } else {
diff --git a/public/main/admin/ldap_form_add_users_group.php b/public/main/admin/ldap_form_add_users_group.php
index 29f4eff775..2ff3d51801 100644
--- a/public/main/admin/ldap_form_add_users_group.php
+++ b/public/main/admin/ldap_form_add_users_group.php
@@ -2,9 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Form to add users through LDAP (deprecated?).
- *
- * @package chamilo.admin
- * Copyright (c) 2007 Mustapha Alouani (supervised by Michel Moreau-Belliard)
  */
 
 /**
@@ -12,7 +9,7 @@
  */
 $nbre = 0;
 echo '<form name="form" method="post" action="'.api_get_self().'?annee='.Security::remove_XSS($annee).'">';
-if ($statut == 1) {
+if (1 == $statut) {
     echo get_lang(
             'e-mailNotifySubscription'
         ).': <input type="checkbox" name="mailling" value="1" checked="checked"><i>'.get_lang(
diff --git a/public/main/admin/ldap_import_students.php b/public/main/admin/ldap_import_students.php
index 1e422e1179..1fab273f80 100644
--- a/public/main/admin/ldap_import_students.php
+++ b/public/main/admin/ldap_import_students.php
@@ -3,9 +3,6 @@
 
 /**
  * Script to import students from LDAP.
- *
- * @package chamilo.admin
- * Copyright (c) 2007 Mustapha Alouani (supervised by Michel Moreau-Belliard)
  */
 // resetting the course id
 $cidReset = true;
@@ -127,7 +124,7 @@ if (empty($annee) && empty($course)) {
     echo '<a href="ldap_import_students.php?annee=&composante=&etape=">'.get_lang('Back to start new search').'</a>';
     echo '<br /><br />';
     echo '</div>';
-} elseif (!empty($annee) && !empty($course) && ($_POST['confirmed'] == 'yes')) {
+} elseif (!empty($annee) && !empty($course) && ('yes' == $_POST['confirmed'])) {
     $id = $_POST['username_form'];
     $UserList = [];
     $userid_match_login = [];
diff --git a/public/main/admin/ldap_import_students_to_session.php b/public/main/admin/ldap_import_students_to_session.php
index 80202b8e99..149a0f221d 100644
--- a/public/main/admin/ldap_import_students_to_session.php
+++ b/public/main/admin/ldap_import_students_to_session.php
@@ -2,9 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Edition script for sessions categories.
- *
- * @package chamilo.admin
- * Copyright (c) 2007 Mustapha Alouani (supervised by Michel Moreau-Belliard)
  */
 
 // resetting the course id
@@ -131,7 +128,7 @@ elseif (!empty($annee) && !empty($id_session) && empty($_POST['confirmed'])) {
     echo '<a href="ldap_import_students.php?annee=">'.get_lang('Back to start new search').'</a>';
     echo '<br /><br />';
     echo '</div>';
-} elseif (!empty($annee) && !empty($id_session) && ($_POST['confirmed'] == 'yes')) {
+} elseif (!empty($annee) && !empty($id_session) && ('yes' == $_POST['confirmed'])) {
     $id = $_POST['username_form'];
     $UserList = [];
     $userid_match_login = [];
@@ -155,7 +152,7 @@ elseif (!empty($annee) && !empty($id_session) && empty($_POST['confirmed'])) {
                     'registered_at' => api_get_utc_datetime(),
                 ]
             );
-            if ($res_user !== false) {
+            if (false !== $res_user) {
                 $num++;
             }
         }
diff --git a/public/main/admin/ldap_users_list.php b/public/main/admin/ldap_users_list.php
index 0e46cf3017..4102206440 100644
--- a/public/main/admin/ldap_users_list.php
+++ b/public/main/admin/ldap_users_list.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * @author Mustapha Alouani
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -16,7 +14,7 @@ $action = @$_GET["action"] ?: null;
 $login_as_user_id = @$_GET["user_id"] ?: null;
 
 // Login as ...
-if ($action == "login_as" && !empty($login_as_user_id)) {
+if ("login_as" == $action && !empty($login_as_user_id)) {
     login_user($login_as_user_id);
 }
 
@@ -123,7 +121,7 @@ if (isset($_POST['action'])) {
                         $UserList[] = ldap_add_user($user_id);
                     }
                 }
-                if (isset($_GET['id_session']) && (trim($_GET['id_session']) != "")) {
+                if (isset($_GET['id_session']) && ("" != trim($_GET['id_session']))) {
                     addUserToSession($UserList, $_GET['id_session']);
                 }
                 if (count($UserList) > 0) {
diff --git a/public/main/admin/ldap_users_synchro.php b/public/main/admin/ldap_users_synchro.php
index ffbfebcc38..0831d3a461 100644
--- a/public/main/admin/ldap_users_synchro.php
+++ b/public/main/admin/ldap_users_synchro.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.admin
- */
+
 /**
  * Code.
  */
@@ -57,7 +55,7 @@ Display::display_header($tool_name);
 		</form>
 
 <?php
-if (isset($action) && ($action == "synchro")) {
+if (isset($action) && ("synchro" == $action)) {
     $included = true;
     require 'ldap_synchro.php';
     echo Display::return_message($message, 'normal', false);
diff --git a/public/main/admin/legal_add.php b/public/main/admin/legal_add.php
index ed3aba6c9b..e08625a0fe 100644
--- a/public/main/admin/legal_add.php
+++ b/public/main/admin/legal_add.php
@@ -3,8 +3,6 @@
 
 /**
  * Management of legal conditions.
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -12,7 +10,7 @@ $this_section = SECTION_PLATFORM_ADMIN;
 
 api_protect_admin_script();
 
-if (api_get_setting('allow_terms_conditions') !== 'true') {
+if ('true' !== api_get_setting('allow_terms_conditions')) {
     api_not_allowed(true);
 }
 
@@ -70,10 +68,10 @@ if ($form->validate()) {
 
         $default['content'] = $content;
         if (isset($values['language'])) {
-            if ($submit == 'back') {
+            if ('back' == $submit) {
                 header('Location: legal_add.php');
                 exit;
-            } elseif ($submit === 'save') {
+            } elseif ('save' === $submit) {
                 $id = LegalManager::add($lang, $content, $type, $changes, $values);
                 if (!empty($id)) {
                     Display::addFlash(Display::return_message(get_lang('Term and condition saved'), 'success'));
@@ -84,7 +82,7 @@ if ($form->validate()) {
                 $tok = Security::get_token();
                 header('Location: legal_list.php?sec_token='.$tok);
                 exit();
-            } elseif ($submit === 'preview') {
+            } elseif ('preview' === $submit) {
                 $defaults['type'] = $type;
                 $defaults['content'] = $content;
                 $defaults['changes'] = $changes;
@@ -138,7 +136,7 @@ if (isset($_POST['language'])) {
 
     $preview = LegalManager::show_last_condition($term_preview);
 
-    if ($term_preview['type'] != -1) {
+    if (-1 != $term_preview['type']) {
         $preview = LegalManager::replaceTags($preview);
         $form->addElement('label', get_lang('Preview'), $preview);
     }
diff --git a/public/main/admin/legal_list.php b/public/main/admin/legal_list.php
index 33ea338284..33dd15e2f3 100644
--- a/public/main/admin/legal_list.php
+++ b/public/main/admin/legal_list.php
@@ -5,8 +5,6 @@ use Chamilo\CoreBundle\Repository\LegalRepository;
 
 /**
  * Sessions list script.
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/admin/promotions.php b/public/main/admin/promotions.php
index afc5cc4379..b2f467300c 100644
--- a/public/main/admin/promotions.php
+++ b/public/main/admin/promotions.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -23,13 +20,13 @@ $action = isset($_GET['action']) ? $_GET['action'] : null;
 $check = Security::check_token('request');
 $token = Security::get_token();
 
-if ($action == 'add') {
+if ('add' == $action) {
     $interbreadcrumb[] = [
         'url' => 'promotions.php',
         'name' => get_lang('Promotions'),
     ];
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Add')];
-} elseif ($action == 'edit') {
+} elseif ('edit' == $action) {
     $interbreadcrumb[] = [
         'url' => 'promotions.php',
         'name' => get_lang('Promotions'),
@@ -43,14 +40,14 @@ if ($action == 'add') {
 Display::display_header('');
 
 // Tool name
-if (isset($_GET['action']) && $_GET['action'] == 'add') {
+if (isset($_GET['action']) && 'add' == $_GET['action']) {
     $tool = 'Add';
     $interbreadcrumb[] = [
         'url' => api_get_self(),
         'name' => get_lang('Promotion'),
     ];
 }
-if (isset($_GET['action']) && $_GET['action'] == 'edit') {
+if (isset($_GET['action']) && 'edit' == $_GET['action']) {
     $tool = 'Modify';
     $interbreadcrumb[] = [
         'url' => api_get_self(),
@@ -120,7 +117,7 @@ $promotion = new Promotion();
 
 switch ($action) {
     case 'add':
-        if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+        if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
             api_not_allowed();
         }
 
@@ -200,7 +197,7 @@ switch ($action) {
         $promotion->display();
         break;
     case 'copy':
-        if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+        if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
             api_not_allowed();
         }
         if ($check) {
diff --git a/public/main/admin/questions.php b/public/main/admin/questions.php
index b3aa89c305..f6e3165e0f 100644
--- a/public/main/admin/questions.php
+++ b/public/main/admin/questions.php
@@ -7,9 +7,6 @@ use ChamiloSession as Session;
 use Doctrine\Common\Collections\Criteria;
 use Knp\Component\Pager\Paginator;
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -177,7 +174,7 @@ if ($formSent) {
                         /** @var CQuiz $exercise */
                         foreach ($exerciseList as $exercise) {
                             $question->questionData .= $exercise->getTitle();
-                            if ($exercise->getActive() == -1) {
+                            if (-1 == $exercise->getActive()) {
                                 $question->questionData .= '- ('.get_lang('The test has been deleted').' #'.$exercise->getIid().') ';
                             }
                             $question->questionData .= '<br />';
diff --git a/public/main/admin/settings.lib.php b/public/main/admin/settings.lib.php
index 281450fe88..44ba28560c 100644
--- a/public/main/admin/settings.lib.php
+++ b/public/main/admin/settings.lib.php
@@ -13,8 +13,6 @@ use Symfony\Component\Filesystem\Filesystem;
  * @author Guillaume Viguier <guillaume@viguierjust.com>
  *
  * @since Chamilo 1.8.7
- *
- * @package chamilo.admin
  */
 define('CSS_UPLOAD_PATH', api_get_path(SYS_PATH).'Resources/public/css/themes/');
 
@@ -314,7 +312,7 @@ function handleStylesheets()
         );
     } else {
         // Uploading a new stylesheet.
-        if ($urlId == 1) {
+        if (1 == $urlId) {
             $show_upload_form = true;
         } else {
             if ($is_style_changeable) {
@@ -385,7 +383,7 @@ function handleStylesheets()
         )
     );
 
-    if ($webPlatformLogoPath !== null) {
+    if (null !== $webPlatformLogoPath) {
         $logoForm->addLabel(
             get_lang('Current logo'),
             '<img id="header-logo-custom" src="'.$webPlatformLogoPath.'?'.time().'">'
@@ -540,7 +538,7 @@ function uploadStylesheet($values, $picture)
 
     $info = pathinfo($picture['name']);
 
-    if ($info['extension'] == 'zip') {
+    if ('zip' == $info['extension']) {
         // Try to open the file and extract it in the theme.
         $zip = new ZipArchive();
         if ($zip->open($picture['tmp_name'])) {
@@ -554,7 +552,7 @@ function uploadStylesheet($values, $picture)
 
             for ($i = 0; $i < $num_files; $i++) {
                 $file = $zip->statIndex($i);
-                if (substr($file['name'], -1) != '/') {
+                if ('/' != substr($file['name'], -1)) {
                     $path_parts = pathinfo($file['name']);
                     if (!in_array($path_parts['extension'], $allowedFiles)) {
                         $valid = false;
@@ -562,7 +560,7 @@ function uploadStylesheet($values, $picture)
                     }
                 }
 
-                if (strpos($file['name'], '/') === false) {
+                if (false === strpos($file['name'], '/')) {
                     $single_directory = false;
                 }
             }
@@ -588,14 +586,14 @@ function uploadStylesheet($values, $picture)
                     $mode = api_get_permissions_for_new_directories();
                     for ($i = 0; $i < $num_files; $i++) {
                         $entry = $zip->getNameIndex($i);
-                        if (substr($entry, -1) == '/') {
+                        if ('/' == substr($entry, -1)) {
                             continue;
                         }
 
                         $pos_slash = strpos($entry, '/');
                         $entry_without_first_dir = substr($entry, $pos_slash + 1);
                         // If there is still a slash, we need to make sure the directories are created.
-                        if (strpos($entry_without_first_dir, '/') !== false) {
+                        if (false !== strpos($entry_without_first_dir, '/')) {
                             if (!is_dir($extraction_path.dirname($entry_without_first_dir))) {
                                 // Create it.
                                 @mkdir($extraction_path.dirname($entry_without_first_dir), $mode, true);
@@ -664,7 +662,7 @@ function storeRegions()
             if (!empty($areas_to_installed)) {
                 $plugin_obj->removeAllRegions($plugin);
                 foreach ($areas_to_installed as $region) {
-                    if (!empty($region) && $region != '-1') {
+                    if (!empty($region) && '-1' != $region) {
                         $plugin_obj->add_to_region($plugin, $region);
                     }
                 }
@@ -781,7 +779,7 @@ function handleSearch()
     }
     $specific_fields = get_specific_field_list();
 
-    if ($search_enabled == 'true') {
+    if ('true' == $search_enabled) {
         $values = api_get_settings_options('search_show_unlinked_results');
         $group = formGenerateElementsGroup(
             $form,
@@ -834,7 +832,7 @@ function handleSearch()
     $form->display();
     echo '</div>';
 
-    if ($search_enabled == 'true') {
+    if ('true' == $search_enabled) {
         $xapianPath = api_get_path(SYS_UPLOAD_PATH).'plugins/xapian/searchdb';
 
         /*
@@ -913,14 +911,14 @@ function handleTemplates()
      * isset() combos all over the place. */
     $action = isset($_GET['action']) ? $_GET['action'] : "invalid";
 
-    if ($action != 'add') {
+    if ('add' != $action) {
         echo '<div class="actions" style="margin-left: 1px;">';
         echo '<a href="settings.php?category=Templates&action=add">'.
                 Display::return_icon('new_template.png', get_lang('Add a template'), '', ICON_SIZE_MEDIUM).'</a>';
         echo '</div>';
     }
 
-    if ($action == 'add' || ($action == 'edit' && is_numeric($_GET['id']))) {
+    if ('add' == $action || ('edit' == $action && is_numeric($_GET['id']))) {
         addEditTemplate();
 
         // Add event to the system log.
@@ -934,7 +932,7 @@ function handleTemplates()
             $user_id
         );
     } else {
-        if ($action == 'delete' && is_numeric($_GET['id'])) {
+        if ('delete' == $action && is_numeric($_GET['id'])) {
             deleteTemplate($_GET['id']);
 
             // Add event to the system log
@@ -1108,7 +1106,7 @@ function addEditTemplate()
     );
 
     // Setting the form elements: the header.
-    if ($_GET['action'] == 'add') {
+    if ('add' == $_GET['action']) {
         $title = get_lang('Add a template');
     } else {
         $title = get_lang('Template edition');
@@ -1137,7 +1135,7 @@ function addEditTemplate()
     $form->addElement('static', 'file_comment', '', get_lang('This image will represent the template in the templates list. It should be no larger than 100x70 pixels'));
 
     // Getting all the information of the template when editing a template.
-    if ($_GET['action'] == 'edit') {
+    if ('edit' == $_GET['action']) {
         $defaults['template_id'] = $id;
         $defaults['template_text'] = $template->getContent();
         // Forcing get_lang().
@@ -1231,7 +1229,7 @@ function addEditTemplate()
             $bootstrap = api_get_bootstrap_and_font_awesome();
             $viewport = '<meta name="viewport" content="width=device-width, initial-scale=1.0">';
 
-            if ($_GET['action'] == 'add') {
+            if ('add' == $_GET['action']) {
                 $templateContent = '<head>'.$viewport.'<title>'.$values['title'].'</title>'.$bootstrap.'</head>'
                     .$values['template_text'];
                 $template
@@ -1414,9 +1412,9 @@ function generateSettingsForm($settings, $settings_by_access_list)
 
         if (!empty($_configuration['multiple_access_urls'])) {
             if (api_is_global_platform_admin()) {
-                if ($row['access_url_locked'] == 0) {
-                    if ($url_id == 1) {
-                        if ($row['access_url_changeable'] == '1') {
+                if (0 == $row['access_url_locked']) {
+                    if (1 == $url_id) {
+                        if ('1' == $row['access_url_changeable']) {
                             $form->addElement(
                                 'html',
                                 '<div class="float-right"><a class="share_this_setting" data_status = "0"  data_to_send = "'.$row['variable'].'" href="javascript:void(0);">'.
@@ -1430,7 +1428,7 @@ function generateSettingsForm($settings, $settings_by_access_list)
                             );
                         }
                     } else {
-                        if ($row['access_url_changeable'] == '1') {
+                        if ('1' == $row['access_url_changeable']) {
                             $form->addElement(
                                 'html',
                                 '<div class="float-right">'.
@@ -1451,12 +1449,12 @@ function generateSettingsForm($settings, $settings_by_access_list)
         $hideme = [];
         $hide_element = false;
 
-        if ($_configuration['access_url'] != 1) {
-            if ($row['access_url_changeable'] == 0) {
+        if (1 != $_configuration['access_url']) {
+            if (0 == $row['access_url_changeable']) {
                 // We hide the element in other cases (checkbox, radiobutton) we 'freeze' the element.
                 $hide_element = true;
                 $hideme = ['disabled'];
-            } elseif ($url_info['active'] == 1) {
+            } elseif (1 == $url_info['active']) {
                 // We show the elements.
                 if (empty($row['variable'])) {
                     $row['variable'] = 0;
@@ -1472,7 +1470,7 @@ function generateSettingsForm($settings, $settings_by_access_list)
                     is_array($settings_by_access_list[$row['variable']][$row['subkey']][$row['category']])
                 ) {
                     // We are sure that the other site have a selected value.
-                    if ($settings_by_access_list[$row['variable']][$row['subkey']][$row['category']]['selected_value'] != '') {
+                    if ('' != $settings_by_access_list[$row['variable']][$row['subkey']][$row['category']]['selected_value']) {
                         $row['selected_value'] = $settings_by_access_list[$row['variable']][$row['subkey']][$row['category']]['selected_value'];
                     }
                 }
@@ -1495,7 +1493,7 @@ function generateSettingsForm($settings, $settings_by_access_list)
                     );
                     $form->applyFilter($row['variable'], 'html_filter');
                     $default_values[$row['variable']] = round($row['selected_value'] / 1024 / 1024, 1);
-                } elseif ($row['variable'] == 'account_valid_duration') {
+                } elseif ('account_valid_duration' == $row['variable']) {
                     $form->addElement(
                         'text',
                         $row['variable'],
@@ -1510,7 +1508,7 @@ function generateSettingsForm($settings, $settings_by_access_list)
                     // For platform character set selection:
                     // Conversion of the textfield to a select box with valid values.
                     $default_values[$row['variable']] = $row['selected_value'];
-                } elseif ($row['variable'] == 'platform_charset') {
+                } elseif ('platform_charset' == $row['variable']) {
                     break;
                 } else {
                     $hideme['class'] = 'col-md-4';
@@ -1529,7 +1527,7 @@ function generateSettingsForm($settings, $settings_by_access_list)
                 }
                 break;
             case 'textarea':
-                if ($row['variable'] == 'header_extra_content') {
+                if ('header_extra_content' == $row['variable']) {
                     $file = api_get_home_path().'header_extra_content.txt';
                     $value = '';
                     if (file_exists($file)) {
@@ -1543,7 +1541,7 @@ function generateSettingsForm($settings, $settings_by_access_list)
                         $hideme
                     );
                     $default_values[$row['variable']] = $value;
-                } elseif ($row['variable'] == 'footer_extra_content') {
+                } elseif ('footer_extra_content' == $row['variable']) {
                     $file = api_get_home_path().'footer_extra_content.txt';
                     $value = '';
                     if (file_exists($file)) {
@@ -1605,14 +1603,14 @@ function generateSettingsForm($settings, $settings_by_access_list)
                 $group = [];
                 while ($rowkeys = Database::fetch_array($result)) {
                     // Profile tab option should be hidden when the social tool is enabled.
-                    if (api_get_setting('allow_social_tool') == 'true') {
-                        if ($rowkeys['variable'] === 'show_tabs' && $rowkeys['subkey'] === 'my_profile') {
+                    if ('true' == api_get_setting('allow_social_tool')) {
+                        if ('show_tabs' === $rowkeys['variable'] && 'my_profile' === $rowkeys['subkey']) {
                             continue;
                         }
                     }
 
                     // Hiding the gradebook option.
-                    if ($rowkeys['variable'] === 'show_tabs' && $rowkeys['subkey'] === 'my_gradebook') {
+                    if ('show_tabs' === $rowkeys['variable'] && 'my_gradebook' === $rowkeys['subkey']) {
                         continue;
                     }
 
@@ -1623,7 +1621,7 @@ function generateSettingsForm($settings, $settings_by_access_list)
                         get_lang($rowkeys['subkeytext'])
                     );
 
-                    if ($row['access_url_changeable'] == 1) {
+                    if (1 == $row['access_url_changeable']) {
                         // 2. We look into the DB if there is a setting for a specific access_url.
                         $access_url = $_configuration['access_url'];
                         if (empty($access_url)) {
@@ -1637,11 +1635,11 @@ function generateSettingsForm($settings, $settings_by_access_list)
                                     access_url =  $access_url";
                         $result_access = Database::query($sql);
                         $row_access = Database::fetch_array($result_access);
-                        if ($row_access['selected_value'] === 'true' && !$form->isSubmitted()) {
+                        if ('true' === $row_access['selected_value'] && !$form->isSubmitted()) {
                             $element->setChecked(true);
                         }
                     } else {
-                        if ($rowkeys['selected_value'] === 'true' && !$form->isSubmitted()) {
+                        if ('true' === $rowkeys['selected_value'] && !$form->isSubmitted()) {
                             $element->setChecked(true);
                         }
                     }
@@ -1706,7 +1704,7 @@ function generateSettingsForm($settings, $settings_by_access_list)
             case 'pdf_export_watermark_enable':
                 $url = PDF::get_watermark(null);
 
-                if ($url != false) {
+                if (false != $url) {
                     $delete_url = '<a href="?delete_watermark">'.get_lang('Remove picture').' '.Display::return_icon('delete.png', get_lang('Remove picture')).'</a>';
                     $form->addElement('html', '<div style="max-height:100px; max-width:100px; margin-left:162px; margin-bottom:10px; clear:both;"><img src="'.$url.'" style="margin-bottom:10px;" />'.$delete_url.'</div>');
                 }
@@ -1767,12 +1765,12 @@ function searchSetting($search)
 
             $title = api_strtolower(get_lang($setting['title']));
             // try the title
-            if (strpos($title, $search) === false) {
+            if (false === strpos($title, $search)) {
                 $comment = api_strtolower(get_lang($setting['comment']));
                 //Try the comment
-                if (strpos($comment, $search) === false) {
+                if (false === strpos($comment, $search)) {
                     //Try the variable name
-                    if (strpos($setting['variable'], $search) === false) {
+                    if (false === strpos($setting['variable'], $search)) {
                         continue;
                     } else {
                         $found = true;
@@ -1870,7 +1868,7 @@ function showSearchSettingsTable($data)
 function showSearchToolsStatusTable()
 {
     //@todo windows support
-    if (api_is_windows_os() == false) {
+    if (false == api_is_windows_os()) {
         $list_of_programs = ['pdftotext', 'ps2pdf', 'catdoc', 'html2text', 'unrtf', 'catppt', 'xls2csv'];
         foreach ($list_of_programs as $program) {
             $output = [];
@@ -1940,7 +1938,7 @@ function isStyleChangeable()
     if ($urlId) {
         $style_info = api_get_settings('stylesheets', '', 1, 0);
         $url_info = api_get_access_url($urlId);
-        if ($style_info[0]['access_url_changeable'] == 1 && $url_info['active'] == 1) {
+        if (1 == $style_info[0]['access_url_changeable'] && 1 == $url_info['active']) {
             $changeable = true;
         }
     } else {
@@ -1962,13 +1960,13 @@ function getCategorySettings($category = '')
     $url_id = api_get_current_access_url_id();
     $settings_by_access_list = [];
 
-    if ($url_id == 1) {
+    if (1 == $url_id) {
         $settings = api_get_settings($category, 'group', $url_id);
     } else {
         $url_info = api_get_access_url($url_id);
-        if ($url_info['active'] == 1) {
+        if (1 == $url_info['active']) {
             $categoryToSearch = $category;
-            if ($category == 'search_setting') {
+            if ('search_setting' == $category) {
                 $categoryToSearch = '';
             }
             // The default settings of Chamilo
@@ -1988,7 +1986,7 @@ function getCategorySettings($category = '')
                 }
 
                 // One more validation if is changeable.
-                if ($row['access_url_changeable'] == 1) {
+                if (1 == $row['access_url_changeable']) {
                     $settings_by_access_list[$row['variable']][$row['subkey']][$row['category']] = $row;
                 } else {
                     $settings_by_access_list[$row['variable']][$row['subkey']][$row['category']] = [];
@@ -1997,7 +1995,7 @@ function getCategorySettings($category = '')
         }
     }
 
-    if (isset($category) && $category == 'search_setting') {
+    if (isset($category) && 'search_setting' == $category) {
         if (!empty($_REQUEST['search_field'])) {
             $settings = searchSetting($_REQUEST['search_field']);
         }
diff --git a/public/main/admin/settings.php b/public/main/admin/settings.php
index 884e79ca5a..6ecb425f84 100644
--- a/public/main/admin/settings.php
+++ b/public/main/admin/settings.php
@@ -9,8 +9,6 @@ use ChamiloSession as Session;
  *
  * @author Patrick Cool
  * @author Julio Montoya - Multiple URL site
- *
- * @package chamilo.admin
  */
 
 // Resetting the course id.
@@ -27,7 +25,7 @@ $_SESSION['this_section'] = $this_section;
 api_protect_admin_script();
 
  // Submit stylesheets.
-if (isset($_POST['save']) && isset($_GET['category']) && $_GET['category'] === 'Stylesheets') {
+if (isset($_POST['save']) && isset($_GET['category']) && 'Stylesheets' === $_GET['category']) {
     storeStylesheets();
     Display::addFlash(Display::return_message(get_lang('Saved.')));
 }
@@ -68,7 +66,7 @@ if (isset($_GET['delete_watermark'])) {
     Display::addFlash(Display::return_message(get_lang('File deleted')));
 }
 
-if (isset($_GET['action']) && $_GET['action'] == 'delete_grading') {
+if (isset($_GET['action']) && 'delete_grading' == $_GET['action']) {
     $id = intval($_GET['id']);
     api_delete_setting_option($id);
 }
@@ -166,19 +164,19 @@ if (!empty($_GET['category']) &&
             }
         }
 
-        if (isset($values['allow_social_tool']) && $values['allow_social_tool'] == 'true') {
+        if (isset($values['allow_social_tool']) && 'true' == $values['allow_social_tool']) {
             $values['allow_message_tool'] = 'true';
         }
 
         foreach ($settings as $item) {
             $key = $item['variable'];
-            if ($key === 'prevent_multiple_simultaneous_login') {
+            if ('prevent_multiple_simultaneous_login' === $key) {
                 Session::write('first_user_login', 1);
             }
             if (in_array($key, $settings_to_avoid)) {
                 continue;
             }
-            if ($key == 'search_field' || $key == 'submit_fixed_in_bottom') {
+            if ('search_field' == $key || 'submit_fixed_in_bottom' == $key) {
                 continue;
             }
             $key = Database::escape_string($key);
@@ -195,14 +193,14 @@ if (!empty($_GET['category']) &&
         $keys = [];
 
         foreach ($values as $key => $value) {
-            if (strcmp($key, 'MAX_FILE_SIZE') === 0) {
+            if (0 === strcmp($key, 'MAX_FILE_SIZE')) {
                 continue;
             }
             if (in_array($key, $settings_to_avoid)) {
                 continue;
             }
             // Avoid form elements which have nothing to do with settings
-            if ($key == 'search_field' || $key == 'submit_fixed_in_bottom') {
+            if ('search_field' == $key || 'submit_fixed_in_bottom' == $key) {
                 continue;
             }
 
@@ -223,9 +221,9 @@ if (!empty($_GET['category']) &&
                     case 'course_validation_terms_and_conditions_url':
                         // URL validation for some settings.
                         $value = trim(Security::remove_XSS($value));
-                        if ($value != '') {
+                        if ('' != $value) {
                             // Here we accept absolute URLs only.
-                            if (strpos($value, '://') === false) {
+                            if (false === strpos($value, '://')) {
                                 $value = 'http://'.$value;
                             }
                             if (!api_valid_url($value, true)) {
@@ -238,7 +236,7 @@ if (!empty($_GET['category']) &&
                     case 'emailAdministrator':
                         // Validation against e-mail address for some settings.
                         $value = trim(Security::remove_XSS($value));
-                        if ($value != '' && !api_valid_email($value)) {
+                        if ('' != $value && !api_valid_email($value)) {
                             // If the new (non-empty) e-mail address is invalid, then the old e-mail address stays.
                             // If the new e-mail address is empty, then it will be stored (i.e. the setting will be deleted).
                             $value = $old_value;
@@ -256,8 +254,8 @@ if (!empty($_GET['category']) &&
 
                 while ($row_subkeys = Database::fetch_array($res)) {
                     // If subkey is changed:
-                    if ((isset($value[$row_subkeys['subkey']]) && api_get_setting($key, $row_subkeys['subkey']) == 'false') ||
-                        (!isset($value[$row_subkeys['subkey']]) && api_get_setting($key, $row_subkeys['subkey']) == 'true')
+                    if ((isset($value[$row_subkeys['subkey']]) && 'false' == api_get_setting($key, $row_subkeys['subkey'])) ||
+                        (!isset($value[$row_subkeys['subkey']]) && 'true' == api_get_setting($key, $row_subkeys['subkey']))
                     ) {
                         $keys[] = $key;
                         break;
diff --git a/public/main/admin/skill.php b/public/main/admin/skill.php
index d84efdba5e..58f86cc3b9 100644
--- a/public/main/admin/skill.php
+++ b/public/main/admin/skill.php
@@ -5,8 +5,6 @@ use Chamilo\CoreBundle\Entity\Skill;
 
 /**
  * This script manages the skills, levels and profiles assignments.
- *
- * @package chamilo.skill
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/admin/skill_badge.php b/public/main/admin/skill_badge.php
index 69aef43e05..16de1eb6a3 100644
--- a/public/main/admin/skill_badge.php
+++ b/public/main/admin/skill_badge.php
@@ -4,8 +4,6 @@
  * Show information about Mozilla OpenBadges.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.admin.openbadges
  */
 $cidReset = true;
 
@@ -19,7 +17,7 @@ Skill::isAllowed();
 $backpack = 'https://backpack.openbadges.org/';
 
 $configBackpack = api_get_setting('openbadges_backpack');
-if (strcmp($backpack, $configBackpack) !== 0) {
+if (0 !== strcmp($backpack, $configBackpack)) {
     $backpack = $configBackpack;
 }
 
diff --git a/public/main/admin/skill_badge_create.php b/public/main/admin/skill_badge_create.php
index 6eb970928f..138c5752e4 100644
--- a/public/main/admin/skill_badge_create.php
+++ b/public/main/admin/skill_badge_create.php
@@ -5,8 +5,6 @@
  * Show information about Mozilla OpenBadges.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.admin.openbadges
  */
 $cidReset = true;
 
@@ -32,12 +30,12 @@ $badgeStudio = [
     'script_js' => '<script src="'.api_get_path(WEB_LIBRARY_JS_PATH).'badge-studio/media/js/studio.js?"></script>',
 ];
 
-if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+if ('POST' === $_SERVER['REQUEST_METHOD']) {
     $params = [
         'id' => $skillId,
     ];
 
-    if ((isset($_FILES['image']) && $_FILES['image']['error'] == 0) ||
+    if ((isset($_FILES['image']) && 0 == $_FILES['image']['error']) ||
         !empty($_POST['badge_studio_image'])
     ) {
         $dirPermissions = api_get_permissions_for_new_directories();
diff --git a/public/main/admin/skill_badge_list.php b/public/main/admin/skill_badge_list.php
index 4a6f1fe456..46258bab37 100644
--- a/public/main/admin/skill_badge_list.php
+++ b/public/main/admin/skill_badge_list.php
@@ -6,8 +6,6 @@
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
  *
- * @package chamilo.admin.openbadges
- *
  * @deprecated use skill_list.php
  */
 $cidReset = true;
diff --git a/public/main/admin/skill_create.php b/public/main/admin/skill_create.php
index d7b3e03e2a..b77b57b082 100644
--- a/public/main/admin/skill_create.php
+++ b/public/main/admin/skill_create.php
@@ -5,8 +5,6 @@
  * Create skill form.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 
diff --git a/public/main/admin/skill_edit.php b/public/main/admin/skill_edit.php
index 87d9b04a6c..e44c6055a2 100644
--- a/public/main/admin/skill_edit.php
+++ b/public/main/admin/skill_edit.php
@@ -5,8 +5,6 @@
  * Skill edit form.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 
diff --git a/public/main/admin/skill_level.php b/public/main/admin/skill_level.php
index 61b4bb3de2..f53fa99bbb 100644
--- a/public/main/admin/skill_level.php
+++ b/public/main/admin/skill_level.php
@@ -5,8 +5,6 @@ use Chamilo\SkillBundle\Entity\Level;
 
 /**
  * Add a skill Level.
- *
- * @package chamilo.skill
  */
 $cidReset = true;
 
diff --git a/public/main/admin/skill_list.php b/public/main/admin/skill_list.php
index 463e94d316..e482304a78 100644
--- a/public/main/admin/skill_list.php
+++ b/public/main/admin/skill_list.php
@@ -5,8 +5,6 @@
  * Skill list for management.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 
diff --git a/public/main/admin/skill_profile.php b/public/main/admin/skill_profile.php
index 072813b8f7..1c32075733 100644
--- a/public/main/admin/skill_profile.php
+++ b/public/main/admin/skill_profile.php
@@ -6,8 +6,6 @@ use Chamilo\SkillBundle\Entity\Profile;
 
 /**
  * Add a skill Profile.
- *
- * @package chamilo.skill
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/admin/skill_rel_course.php b/public/main/admin/skill_rel_course.php
index fc973f44e6..ed79005424 100644
--- a/public/main/admin/skill_rel_course.php
+++ b/public/main/admin/skill_rel_course.php
@@ -6,7 +6,7 @@ use Chamilo\SkillBundle\Entity\SkillRelCourse;
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
-if (api_get_configuration_value('allow_skill_rel_items') == false) {
+if (false == api_get_configuration_value('allow_skill_rel_items')) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/admin/skill_translate.php b/public/main/admin/skill_translate.php
index b07286c7e5..7ef1ca60e0 100644
--- a/public/main/admin/skill_translate.php
+++ b/public/main/admin/skill_translate.php
@@ -23,13 +23,13 @@ if (isset($_GET['skill'])) {
     /** @var Skill $skill */
     $skill = $em->find('ChamiloCoreBundle:Skill', intval($_GET['skill']));
 
-    if ($action === 'name') {
+    if ('name' === $action) {
         $variableLanguage = ChamiloApi::getLanguageVar(
             $skill->getName(false),
             'Skill'
         );
         $originalName = $skill->getName(false);
-    } elseif ($action === 'code') {
+    } elseif ('code' === $action) {
         $variableLanguage = ChamiloApi::getLanguageVar(
             $skill->getShortCode(false),
             'SkillCode'
@@ -93,7 +93,7 @@ $form->setDefaults([
     'variable_language' => '$'.$variableLanguage,
     'original_name' => $originalName,
     'sub_language' => $languageId,
-    'new_language' => $action === 'code' ? $skill->getShortCode() : $skill->getName(),
+    'new_language' => 'code' === $action ? $skill->getShortCode() : $skill->getName(),
 ]);
 $form->addRule('sub_language', get_lang('Required'), 'required');
 $form->freeze(['variable_language', 'original_name']);
diff --git a/public/main/admin/skills.php b/public/main/admin/skills.php
index 0d8db2379a..e1e0c945d3 100644
--- a/public/main/admin/skills.php
+++ b/public/main/admin/skills.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/admin/skills_gradebook.php b/public/main/admin/skills_gradebook.php
index 0ad69dae80..1314652bf0 100644
--- a/public/main/admin/skills_gradebook.php
+++ b/public/main/admin/skills_gradebook.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -20,7 +17,7 @@ $action = isset($_REQUEST['action']) ? $_REQUEST['action'] : 'display';
 // setting breadcrumbs
 $tool_name = get_lang('Skills and assessments');
 $interbreadcrumb[] = ['url' => 'index.php', 'name' => get_lang('Administration')];
-if ($action == 'add_skill') {
+if ('add_skill' == $action) {
     $interbreadcrumb[] = ['url' => 'skills_gradebook.php', 'name' => get_lang('Skills and assessments')];
     $tool_name = get_lang('Add');
 }
diff --git a/public/main/admin/skills_import.php b/public/main/admin/skills_import.php
index f50e5e1ff4..f25223604a 100644
--- a/public/main/admin/skills_import.php
+++ b/public/main/admin/skills_import.php
@@ -3,7 +3,6 @@
 /**
  * This tool allows platform admins to add skills by uploading a CSV or XML file.
  *
- * @package chamilo.admin
  * @documentation Some interesting basic skills can be found in the "Skills"
  * section here: http://en.wikipedia.org/wiki/Personal_knowledge_management
  */
@@ -112,7 +111,7 @@ $extra_fields = UserManager::get_extra_fields(0, 0, 5, 'ASC', true);
 $user_id_error = [];
 $error_message = '';
 
-if (!empty($_POST['formSent']) && $_FILES['import_file']['size'] !== 0) {
+if (!empty($_POST['formSent']) && 0 !== $_FILES['import_file']['size']) {
     $file_type = $_POST['file_type'];
     Security::clear_token();
     $tok = Security::get_token();
@@ -123,7 +122,7 @@ if (!empty($_POST['formSent']) && $_FILES['import_file']['size'] !== 0) {
     $ext_import_file = substr($_FILES['import_file']['name'], (strrpos($_FILES['import_file']['name'], '.') + 1));
 
     if (in_array($ext_import_file, $allowed_file_mimetype)) {
-        if (strcmp($file_type, 'csv') === 0 && $ext_import_file == $allowed_file_mimetype[0]) {
+        if (0 === strcmp($file_type, 'csv') && $ext_import_file == $allowed_file_mimetype[0]) {
             $skills = parse_csv_data($_FILES['import_file']['tmp_name']);
             $errors = validate_data($skills);
             $error_kind_file = false;
@@ -149,7 +148,7 @@ if (!empty($_POST['formSent']) && $_FILES['import_file']['size'] !== 0) {
         }
     }
 
-    if (strcmp($file_type, 'csv') === 0) {
+    if (0 === strcmp($file_type, 'csv')) {
         save_data($skills_to_insert);
     } else {
         $error_message = get_lang('You must import a file corresponding to the selected format');
@@ -161,7 +160,7 @@ if (!empty($_POST['formSent']) && $_FILES['import_file']['size'] !== 0) {
         $see_message_import = get_lang('File imported');
     }
 
-    if (count($errors) != 0) {
+    if (0 != count($errors)) {
         $warning_message = '<ul>';
         foreach ($errors as $index => $error_skill) {
             $warning_message .= '<li><b>'.$error_skill['error'].'</b>: ';
diff --git a/public/main/admin/skills_profile.php b/public/main/admin/skills_profile.php
index 7ca942cdfe..1a0ad9a60e 100644
--- a/public/main/admin/skills_profile.php
+++ b/public/main/admin/skills_profile.php
@@ -3,9 +3,6 @@
 
 use ChamiloSession as Session;
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 $this_section = SECTION_PLATFORM_ADMIN;
diff --git a/public/main/admin/skills_wheel.php b/public/main/admin/skills_wheel.php
index 0852e80843..14234f44a0 100644
--- a/public/main/admin/skills_wheel.php
+++ b/public/main/admin/skills_wheel.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/admin/special_exports.php b/public/main/admin/special_exports.php
index e46d90bb80..43a6ddae71 100644
--- a/public/main/admin/special_exports.php
+++ b/public/main/admin/special_exports.php
@@ -27,18 +27,18 @@ Display::display_header($nameTools);
 
 echo Display::page_header($nameTools);
 
-if (count($_POST) == 0) {
+if (0 == count($_POST)) {
     echo Display::return_message(get_lang('Special exportsIntroduction'));
 }
 $error = 0;
 $tbl_session = Database::get_main_table(TABLE_MAIN_SESSION);
 $tbl_session_course = Database::get_main_table(TABLE_MAIN_SESSION_COURSE);
 
-if ((isset($_POST['action']) && $_POST['action'] == 'course_select_form') ||
-    (isset($_POST['backup_option']) && $_POST['backup_option'] == 'full_backup')
+if ((isset($_POST['action']) && 'course_select_form' == $_POST['action']) ||
+    (isset($_POST['backup_option']) && 'full_backup' == $_POST['backup_option'])
 ) {
     $export = false;
-    if (isset($_POST['action']) && $_POST['action'] == 'course_select_form') {
+    if (isset($_POST['action']) && 'course_select_form' == $_POST['action']) {
         $FileZip = create_zip();
         $to_group_id = 0;
         $sql_session = "SELECT id, name FROM $tbl_session ";
@@ -54,7 +54,7 @@ if ((isset($_POST['action']) && $_POST['action'] == 'course_select_form') ||
         }
 
         $zip_folder = new PclZip($FileZip['TEMP_FILE_ZIP']);
-        if (!isset($_POST['resource']) || count($_POST['resource']) == 0) {
+        if (!isset($_POST['resource']) || 0 == count($_POST['resource'])) {
             echo Display::return_message(get_lang('There were no courses registered or may not have made the association with the sessions'), 'error');
         } else {
             $Resource = $_POST['resource'];
@@ -125,10 +125,10 @@ if ($export && $name) {
     echo '<br /><a class="btn btn-default" href="'.api_get_path(WEB_CODE_PATH).'course_info/download.php?archive_path=&archive='.urlencode($name).'">'.get_lang('Download').'</a>';
 } else {
     // Display forms especial export
-    if (isset($_POST['backup_option']) && $_POST['backup_option'] == 'select_items') {
+    if (isset($_POST['backup_option']) && 'select_items' == $_POST['backup_option']) {
         $cb = new CourseBuilder();
         $course = $cb->build_session_course();
-        if ($course === false) {
+        if (false === $course) {
             echo Display::return_message(get_lang('There were no courses registered or may not have made the association with the sessions'), 'error');
             form_special_export();
         } else {
@@ -163,7 +163,7 @@ function create_zip()
     if (empty($path)) {
         $path = '/';
     }
-    $remove_dir = ($path != '/') ? substr($path, 0, strlen($path) - strlen(basename($path))) : '/';
+    $remove_dir = ('/' != $path) ? substr($path, 0, strlen($path) - strlen(basename($path))) : '/';
     $sys_archive_path = api_get_path(SYS_ARCHIVE_PATH).'special_export/';
     $sys_course_path = api_get_path(SYS_COURSE_PATH);
     $temp_zip_dir = $sys_archive_path;
@@ -172,7 +172,7 @@ function create_zip()
     } else {
         $handle = opendir($temp_zip_dir);
         while (false !== ($file = readdir($handle))) {
-            if ($file != "." && $file != "..") {
+            if ("." != $file && ".." != $file) {
                 $Diff = (time() - filemtime("$temp_zip_dir/$file")) / 60 / 60; //the "age" of the file in hours
                 if ($Diff > 4) {
                     unlink("$temp_zip_dir/$file");
@@ -193,8 +193,8 @@ function create_zip()
 
 function rename_zip($FileZip)
 {
-    Event::event_download(($FileZip['PATH'] == '/') ? 'full_export_'.date('Ymd').'.zip (folder)' : basename($FileZip['PATH']).'.zip (folder)');
-    $name = ($FileZip['PATH'] == '/') ? 'full_export_'.date('Ymd').'.zip' : basename($FileZip['PATH']).'.zip';
+    Event::event_download(('/' == $FileZip['PATH']) ? 'full_export_'.date('Ymd').'.zip (folder)' : basename($FileZip['PATH']).'.zip (folder)');
+    $name = ('/' == $FileZip['PATH']) ? 'full_export_'.date('Ymd').'.zip' : basename($FileZip['PATH']).'.zip';
     if (file_exists($FileZip['PATH_TEMP_ARCHIVE'].'/'.$name)) {
         unlink($FileZip['PATH_TEMP_ARCHIVE'].'/'.$name);
     }
@@ -227,7 +227,7 @@ function fullexportspecial()
 
     if (count($list_course) > 0) {
         foreach ($list_course as $_course) {
-            if ($FileZip['PATH'] == '/') {
+            if ('/' == $FileZip['PATH']) {
                 $querypath = ''; // to prevent ...path LIKE '//%'... in query
             } else {
                 $querypath = $FileZip['PATH'];
@@ -290,7 +290,7 @@ function fullexportspecial()
         }
 
         $name = rename_zip($FileZip);
-        if ($name === false) {
+        if (false === $name) {
             $export = false;
 
             return false;
diff --git a/public/main/admin/specific_fields.php b/public/main/admin/specific_fields.php
index 4949ff473c..b822972bba 100644
--- a/public/main/admin/specific_fields.php
+++ b/public/main/admin/specific_fields.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Manage specific fields.
- *
- * @package chamilo.admin
  */
 // Resetting the course id.
 $cidReset = true;
@@ -64,7 +62,7 @@ function edit_filter($id, $url_params, $row)
     return $return;
 }
 
-if (isset($_REQUEST['action']) && $_REQUEST['action'] == 'delete') {
+if (isset($_REQUEST['action']) && 'delete' == $_REQUEST['action']) {
     delete_specific_field($_REQUEST['field_id']);
     header('Location: specific_fields.php?message='.get_lang('Field removed'));
     exit;
diff --git a/public/main/admin/specific_fields_add.php b/public/main/admin/specific_fields_add.php
index a2d6730cf7..6e13a10093 100644
--- a/public/main/admin/specific_fields_add.php
+++ b/public/main/admin/specific_fields_add.php
@@ -3,8 +3,6 @@
 
 /**
  * Add form.
- *
- * @package chamilo.admin
  */
 
 // Resetting the course id.
@@ -35,7 +33,7 @@ $interbreadcrumb[] = [
 
 $tool_name = get_lang('Add a specific search field');
 
-if (isset($_GET['action']) && $_GET['action'] === 'edit') {
+if (isset($_GET['action']) && 'edit' === $_GET['action']) {
     $tool_name = get_lang('Edit specific search field');
 }
 // Create the form
@@ -63,7 +61,7 @@ $form->addButtonCreate(get_lang('Add'), 'submit');
 if ($form->validate()) {
     $field = $form->exportValues();
     $field_name = $field['field_name'];
-    if (is_numeric($field['field_id']) && $field['field_id'] != 0 && !empty($field['field_id'])) {
+    if (is_numeric($field['field_id']) && 0 != $field['field_id'] && !empty($field['field_id'])) {
         edit_specific_field($field['field_id'], $field['field_name']);
         $message = get_lang('Field added.');
     } else {
diff --git a/public/main/admin/statistics.php b/public/main/admin/statistics.php
index 33e1cacf2f..7761b5ae9f 100644
--- a/public/main/admin/statistics.php
+++ b/public/main/admin/statistics.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *   @package chamilo.admin
- */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 $this_section = SECTION_PLATFORM_ADMIN;
diff --git a/public/main/admin/statistics/index.php b/public/main/admin/statistics/index.php
index b7b7f77471..d7f364bfe2 100644
--- a/public/main/admin/statistics/index.php
+++ b/public/main/admin/statistics/index.php
@@ -313,7 +313,7 @@ if (
     }
 }
 
-if ($report === 'user_session') {
+if ('user_session' === $report) {
     $htmlHeadXtra[] = api_get_jqgrid_js();
 }
 
@@ -439,13 +439,13 @@ switch ($report) {
             $averageUser = 0;
             $averageCoach = 0;
             if (!empty($numberOfWeeks)) {
-                $sessionAverage = api_number_format($sessionCount/$numberOfWeeks, 2);
+                $sessionAverage = api_number_format($sessionCount / $numberOfWeeks, 2);
             }
             if (!empty($numberUsers)) {
-                $averageUser = api_number_format($sessionCount/$numberUsers, 2);
+                $averageUser = api_number_format($sessionCount / $numberUsers, 2);
             }
             if (!empty($uniqueCoaches)) {
-                $averageCoach = api_number_format($sessionCount/$uniqueCoaches, 2);
+                $averageCoach = api_number_format($sessionCount / $uniqueCoaches, 2);
             }
 
             $table = new HTML_Table(['class' => 'table table-responsive']);
@@ -541,7 +541,7 @@ switch ($report) {
             $content .= $table->toHtml();
         }
 
-        if (isset($_REQUEST['action']) && $_REQUEST['action'] === 'export') {
+        if (isset($_REQUEST['action']) && 'export' === $_REQUEST['action']) {
             $data = $table->toArray();
             Export::arrayToXls($data);
             exit;
@@ -674,7 +674,7 @@ switch ($report) {
         $content .= Statistics::printToolStats();
         break;
     case 'coursebylanguage':
-        $content .=  '<canvas class="col-md-12" id="canvas" height="300px" style="margin-bottom: 20px"></canvas>';
+        $content .= '<canvas class="col-md-12" id="canvas" height="300px" style="margin-bottom: 20px"></canvas>';
         $result = Statistics::printCourseByLanguageStats();
         $content .= Statistics::printStats(get_lang('CountCourseByLanguage'), $result, true);
         break;
@@ -687,21 +687,21 @@ switch ($report) {
             $startDate = $values['daterange_start'];
             $endDate = $values['daterange_end'];
 
-            $content .=  '<div class="row">';
-            $content .=  '<div class="col-md-4"><canvas id="canvas1" style="margin-bottom: 20px"></canvas></div>';
-            $content .=  '<div class="col-md-4"><canvas id="canvas2" style="margin-bottom: 20px"></canvas></div>';
-            $content .=  '<div class="col-md-4"><canvas id="canvas3" style="margin-bottom: 20px"></canvas></div>';
-            $content .=  '</div>';
+            $content .= '<div class="row">';
+            $content .= '<div class="col-md-4"><canvas id="canvas1" style="margin-bottom: 20px"></canvas></div>';
+            $content .= '<div class="col-md-4"><canvas id="canvas2" style="margin-bottom: 20px"></canvas></div>';
+            $content .= '<div class="col-md-4"><canvas id="canvas3" style="margin-bottom: 20px"></canvas></div>';
+            $content .= '</div>';
 
-            $content .=  '<div class="row">';
-            $content .=  '<div class="col-md-6"><canvas id="canvas4" style="margin-bottom: 20px"></canvas></div>';
-            $content .=  '<div class="col-md-6"><canvas id="canvas5" style="margin-bottom: 20px"></canvas></div>';
-            $content .=  '</div>';
+            $content .= '<div class="row">';
+            $content .= '<div class="col-md-6"><canvas id="canvas4" style="margin-bottom: 20px"></canvas></div>';
+            $content .= '<div class="col-md-6"><canvas id="canvas5" style="margin-bottom: 20px"></canvas></div>';
+            $content .= '</div>';
 
-            $content .=  '<div class="row">';
-            $content .=  '<div class="col-md-6"><canvas id="canvas6" style="margin-bottom: 20px"></canvas></div>';
-            $content .=  '<div class="col-md-6"><canvas id="canvas7" style="margin-bottom: 20px"></canvas></div>';
-            $content .=  '</div>';
+            $content .= '<div class="row">';
+            $content .= '<div class="col-md-6"><canvas id="canvas6" style="margin-bottom: 20px"></canvas></div>';
+            $content .= '<div class="col-md-6"><canvas id="canvas7" style="margin-bottom: 20px"></canvas></div>';
+            $content .= '</div>';
 
             $conditions = [];
             $extraConditions = '';
@@ -751,7 +751,7 @@ switch ($report) {
                 get_lang('UserBirthday'),
             ];
 
-            if (isset($_REQUEST['action_table']) && $_REQUEST['action_table'] === 'export') {
+            if (isset($_REQUEST['action_table']) && 'export' === $_REQUEST['action_table']) {
                 $first = 0;
                 $limit = $totalCount;
                 $data[] = $headers;
@@ -798,14 +798,14 @@ switch ($report) {
                 $item[] = $residence;
                 $item[] = $career;
                 $item[] = $statusList[$user['status']];
-                $item[] = $user['active'] == 1 ? get_lang('Yes') : get_lang('No');
+                $item[] = 1 == $user['active'] ? get_lang('Yes') : get_lang('No');
                 $item[] = $certificate ? get_lang('Yes') : get_lang('No');
                 $item[] = $birthDate;
                 $data[] = $item;
                 $row++;
             }
 
-            if (isset($_REQUEST['action_table']) && $_REQUEST['action_table'] === 'export') {
+            if (isset($_REQUEST['action_table']) && 'export' === $_REQUEST['action_table']) {
                 Export::arrayToXls($data);
                 exit;
             }
@@ -821,10 +821,10 @@ switch ($report) {
                 $table->set_header($column, $header, false);
                 $column++;
             }
-            $content .=  $table->return_table();
+            $content .= $table->return_table();
         }
 
-        $content =  $form->returnForm().$content;
+        $content = $form->returnForm().$content;
 
         break;
     case 'users':
@@ -880,7 +880,7 @@ switch ($report) {
         $content .= ZombieReport::create(['report' => 'zombies'])->display(true);
         break;
     case 'activities':
-        $content .=Statistics::printActivitiesStats();
+        $content .= Statistics::printActivitiesStats();
         break;
     case 'messagesent':
         $messages_sent = Statistics::getMessages('sent');
diff --git a/public/main/admin/sub_language.php b/public/main/admin/sub_language.php
index aceb5c1d8b..13bc3ca9ca 100644
--- a/public/main/admin/sub_language.php
+++ b/public/main/admin/sub_language.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Script for sub-language administration.
- *
- * @package chamilo.admin.sub_language
  */
 $cidReset = true;
 $this_script = 'sub_language';
@@ -76,7 +74,7 @@ if (isset($_GET['id']) && $_GET['id'] == strval(intval($_GET['id']))) {
     if (!file_exists($sub_language_file) || !is_writable($sub_language_file)) {
         $sublanguage_folder_error = $sub_language_file.' '.get_lang('is not writeable');
     }
-    if (SubLanguageManager::check_if_exist_language_by_id($_GET['id']) === true) {
+    if (true === SubLanguageManager::check_if_exist_language_by_id($_GET['id'])) {
         $language_id_exist = true;
     } else {
         $language_id_exist = false;
@@ -89,7 +87,7 @@ if (isset($_GET['id']) && $_GET['id'] == strval(intval($_GET['id']))) {
 $intro = sprintf(get_lang('Define new terms for sub-language %s by searching some term, then save each translation by clicking the save button. You will then have to switch your own user language to see the new terms appear.'), strtolower($sub_language_name));
 $path_folder = api_get_path(SYS_LANG_PATH).$all_data_of_language['dokeos_folder'];
 
-if (!is_dir($path_folder) || strlen($all_data_of_language['dokeos_folder']) == 0) {
+if (!is_dir($path_folder) || 0 == strlen($all_data_of_language['dokeos_folder'])) {
     api_not_allowed(true);
 }
 
@@ -162,7 +160,7 @@ function search_language_term(
                 }
                 $founded = false;
                 // searching the item in the parent tool
-                if (preg_match($term, $parent_variable_value) !== 0) {
+                if (0 !== preg_match($term, $parent_variable_value)) {
                     $founded = true;
                 }
                 if ($founded) {
@@ -230,16 +228,16 @@ function search_language_term(
                 $founded = false;
                 if ($search_in_english && $search_in_variable) {
                     // searching the item in the parent tool
-                    if (preg_match($term, $variable_value) !== 0 || preg_match($term, $name_variable) !== 0) {
+                    if (0 !== preg_match($term, $variable_value) || 0 !== preg_match($term, $name_variable)) {
                         $founded = true;
                     }
                 } else {
                     if ($search_in_english) {
-                        if (preg_match($term, $variable_value) !== 0) {
+                        if (0 !== preg_match($term, $variable_value)) {
                             $founded = true;
                         }
                     } else {
-                        if (preg_match($term, $name_variable) !== 0) {
+                        if (0 !== preg_match($term, $name_variable)) {
                             $founded = true;
                         }
                     }
@@ -305,7 +303,7 @@ function search_language_term(
 
                 $founded = false;
                 // searching the item in the parent tool
-                if (preg_match($term, $variable_value) !== 0) {
+                if (0 !== preg_match($term, $variable_value)) {
                     $founded = true;
                 }
                 if ($founded) {
diff --git a/public/main/admin/sub_language_add.php b/public/main/admin/sub_language_add.php
index c7eda54f27..88a333a90d 100644
--- a/public/main/admin/sub_language_add.php
+++ b/public/main/admin/sub_language_add.php
@@ -3,8 +3,6 @@
 
 /**
  * This script allows for the addition of sub-languages.
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -45,7 +43,7 @@ function add_sub_language($original_name, $english_name, $isocode, $sublanguage_
     $sql = 'INSERT INTO '.$tbl_admin_languages.'(original_name,english_name,isocode,dokeos_folder,available,parent_id)
     	  VALUES ("'.$original_name.'","'.$english_name.'","'.$isocode.'","'.$english_name.'","'.$sublanguage_available.'","'.$parent_id.'")';
     $res = Database::query($sql);
-    if ($res === false) {
+    if (false === $res) {
         return false;
     }
 
@@ -84,11 +82,11 @@ function check_if_language_exist($original_name, $english_name, $isocode, $subla
     $has_error = false;
     $message_information = [];
 
-    if ($count_original_name == 1) {
+    if (1 == $count_original_name) {
         $has_error = true;
         $message_information['original_name'] = true;
     }
-    if ($count_english_name == 1) {
+    if (1 == $count_english_name) {
         $has_error = true;
         $message_information['english_name'] = true;
     }
@@ -100,10 +98,10 @@ function check_if_language_exist($original_name, $english_name, $isocode, $subla
         $has_error = true;
         $message_information['isocode'] = true;
     }
-    if ($has_error === true) {
+    if (true === $has_error) {
         $message_information['execute_add'] = false;
     }
-    if ($has_error === false) {
+    if (false === $has_error) {
         $message_information['execute_add'] = true;
     }
 
@@ -136,7 +134,7 @@ function ckeck_if_is_parent_of_sub_language($parent_id)
 {
     $sql = 'SELECT count(*) AS count FROM language WHERE parent_id= '.intval($parent_id);
     $rs = Database::query($sql);
-    if (Database::num_rows($rs) > 0 && Database::result($rs, 0, 'count') == 1) {
+    if (Database::num_rows($rs) > 0 && 1 == Database::result($rs, 0, 'count')) {
         return true;
     } else {
         return false;
@@ -162,7 +160,7 @@ function allow_get_all_information_of_sub_language($parent_id, $sub_language_id)
 
 if (isset($_GET['sub_language_id']) && $_GET['sub_language_id'] == strval(intval($_GET['sub_language_id']))) {
     $language_name = SubLanguageManager::get_name_of_language_by_id($_GET['sub_language_id']);
-    if (check_if_exist_language_by_id($_GET['sub_language_id']) === true) {
+    if (true === check_if_exist_language_by_id($_GET['sub_language_id'])) {
         $sub_language_id = $_GET['sub_language_id'];
         $sub_language_id_exist = true;
     } else {
@@ -174,7 +172,7 @@ $language_name = '';
 if (isset($_GET['id']) && $_GET['id'] == strval(intval($_GET['id']))) {
     $language_details = SubLanguageManager::get_all_information_of_language($_GET['id']);
     $language_name = $language_details['original_name'];
-    if (check_if_exist_language_by_id($_GET['id']) === true) {
+    if (true === check_if_exist_language_by_id($_GET['id'])) {
         $parent_id = $_GET['id'];
         $language_id_exist = true;
     } else {
@@ -189,7 +187,7 @@ if (isset($_GET['id']) && $_GET['id'] == strval(intval($_GET['id']))) {
 if ((isset($_GET['id']) && $_GET['id'] == strval(intval($_GET['id']))) &&
     (isset($_GET['sub_language_id']) && $_GET['sub_language_id'] == strval(intval($_GET['sub_language_id'])))
 ) {
-    if (check_if_exist_language_by_id($_GET['id']) === true && check_if_exist_language_by_id($_GET['sub_language_id']) === true) {
+    if (true === check_if_exist_language_by_id($_GET['id']) && true === check_if_exist_language_by_id($_GET['sub_language_id'])) {
         $get_all_information = allow_get_all_information_of_sub_language($_GET['id'], $_GET['sub_language_id']);
         $original_name = $get_all_information['original_name'];
         $english_name = $get_all_information['english_name'];
@@ -199,8 +197,8 @@ if ((isset($_GET['id']) && $_GET['id'] == strval(intval($_GET['id']))) &&
 
 $language_name = get_lang('Create sub-languageForLanguage').' ( '.strtolower($language_name).' )';
 
-if (ckeck_if_is_parent_of_sub_language($parent_id) === true &&
-    isset($_GET['action']) && $_GET['action'] == 'deletesublanguage'
+if (true === ckeck_if_is_parent_of_sub_language($parent_id) &&
+    isset($_GET['action']) && 'deletesublanguage' == $_GET['action']
 ) {
     $language_name = get_lang('Delete sub-language');
 }
@@ -219,28 +217,28 @@ if (isset($_POST['SubmitAddNewLanguage'])) {
     $check_information = check_if_language_exist($original_name, $english_name, $isocode, $sublanguage_available);
     foreach ($check_information as $index_information => $value_information) {
         $allow_insert_info = false;
-        if ($index_information == 'original_name') {
+        if ('original_name' == $index_information) {
             $msg .= Display::return_message(
                 get_lang('Already exists').' "'.get_lang('Original name').'" '.'('.$original_name.')',
                 'error'
             );
         }
-        if ($index_information == 'english_name') {
+        if ('english_name' == $index_information) {
             $msg .= Display::return_message(
                 get_lang('Already exists').' "'.get_lang('English name').'" '.'('.$english_name.')',
                 'error'
             );
         }
-        if ($index_information == 'isocode') {
+        if ('isocode' == $index_information) {
             $msg .= Display::return_message(get_lang('This code does not exist').': '.$isocode.'', 'error');
         }
-        if ($index_information == 'execute_add' && $value_information === true) {
+        if ('execute_add' == $index_information && true === $value_information) {
             $allow_insert_info = true;
         }
     }
 
     if (strlen($original_name) > 0 && strlen($english_name) > 0 && strlen($isocode) > 0) {
-        if ($allow_insert_info === true && $language_id_exist === true) {
+        if (true === $allow_insert_info && true === $language_id_exist) {
             $english_name = str_replace(' ', '_', $english_name);
             //Fixes BT#1636
             $english_name = api_strtolower($english_name);
@@ -251,7 +249,7 @@ if (isset($_POST['SubmitAddNewLanguage'])) {
             $mkdir_result = SubLanguageManager::add_language_directory($english_name);
             if ($mkdir_result) {
                 $sl_id = add_sub_language($original_name, $english_name, $isocode, $sublanguage_available, $parent_id);
-                if ($sl_id === false) {
+                if (false === $sl_id) {
                     SubLanguageManager::remove_language_directory($english_name);
                     $msg .= Display::return_message(get_lang('The /main/lang directory, used on this portal to store the languages, is not writable. Please contact your platform administrator and report this message.'), 'error');
                 } else {
@@ -267,7 +265,7 @@ if (isset($_POST['SubmitAddNewLanguage'])) {
                 $msg .= Display::return_message(get_lang('The /main/lang directory, used on this portal to store the languages, is not writable. Please contact your platform administrator and report this message.'), 'error');
             }
         } else {
-            if ($language_id_exist === false) {
+            if (false === $language_id_exist) {
                 $msg .= Display::return_message(get_lang('The parent language does not exist.'), 'error');
             }
         }
@@ -282,14 +280,14 @@ echo $msg;
 
 if (isset($_POST['SubmitAddDeleteLanguage'])) {
     $rs = SubLanguageManager::remove_sub_language($_GET['id'], $_GET['sub_language_id']);
-    if ($rs === true) {
+    if (true === $rs) {
         echo Display::return_message(get_lang('The sub language has been removed'), 'confirm');
     } else {
         echo Display::return_message(get_lang('The sub-language has not been removed.'), 'error');
     }
 }
 // ckeck_if_is_parent_of_sub_language($parent_id)===false
-if (isset($_GET['action']) && $_GET['action'] == 'definenewsublanguage') {
+if (isset($_GET['action']) && 'definenewsublanguage' == $_GET['action']) {
     $text = $language_name;
     $form = new FormValidator(
         'addsublanguage',
@@ -313,7 +311,7 @@ if (isset($_GET['action']) && $_GET['action'] == 'definenewsublanguage') {
     $form->setDefaults($values);
     $form->display();
 } else {
-    if (isset($_GET['action']) && $_GET['action'] == 'deletesublanguage') {
+    if (isset($_GET['action']) && 'deletesublanguage' == $_GET['action']) {
         $text = $language_name;
         $form = new FormValidator(
             'deletesublanguage',
@@ -328,7 +326,7 @@ if (isset($_GET['action']) && $_GET['action'] == 'definenewsublanguage') {
         $form->addButtonCreate(get_lang('Delete sub-language'), 'SubmitAddDeleteLanguage');
         $form->display();
     }
-    if (isset($_GET['action']) && $_GET['action'] == 'definenewsublanguage') {
+    if (isset($_GET['action']) && 'definenewsublanguage' == $_GET['action']) {
         echo Display::return_message(get_lang('The sub-language of this language has been added'));
     }
 }
diff --git a/public/main/admin/sub_language_ajax.inc.php b/public/main/admin/sub_language_ajax.inc.php
index e449450545..2bf6c765cb 100644
--- a/public/main/admin/sub_language_ajax.inc.php
+++ b/public/main/admin/sub_language_ajax.inc.php
@@ -5,8 +5,6 @@ use Chamilo\CoreBundle\Entity\ExtraField;
 
 /**
  * Sub language AJAX script to update variables.
- *
- * @package chamilo.admin.sub_language
  */
 $this_script = 'sub_language';
 require_once __DIR__.'/../inc/global.inc.php';
@@ -41,7 +39,7 @@ if (isset($new_language) && isset($language_variable) && isset($file_id)) {
     $variables_with_problems = '';
     if (!empty($result_array)) {
         foreach ($result_array as $key => $result) {
-            if ($result == false) {
+            if (false == $result) {
                 $variables_with_problems .= $key.' <br />';
             }
         }
diff --git a/public/main/admin/subscribe_user2course.php b/public/main/admin/subscribe_user2course.php
index 222ed57455..35d84128db 100644
--- a/public/main/admin/subscribe_user2course.php
+++ b/public/main/admin/subscribe_user2course.php
@@ -7,8 +7,6 @@
  *	you can select multiple users and courses and then click on
  *	'Add to this(these) course(s)'.
  *
- *	@package chamilo.admin
- *
  * 	@todo use formvalidator for the form
  */
 $cidReset = true;
@@ -55,7 +53,7 @@ $new_field_list = [];
 if (is_array($extra_field_list)) {
     foreach ($extra_field_list as $extra_field) {
         // if is enabled to filter and is a "<select>" field type
-        if ($extra_field[8] == 1 && $extra_field[2] == ExtraField::FIELD_TYPE_SELECT) {
+        if (1 == $extra_field[8] && ExtraField::FIELD_TYPE_SELECT == $extra_field[2]) {
             $new_field_list[] = [
                 'name' => $extra_field[3],
                 'type' => $extra_field[2],
@@ -63,7 +61,7 @@ if (is_array($extra_field_list)) {
                 'data' => $extra_field[9],
             ];
         }
-        if ($extra_field[8] == 1 && $extra_field[2] == ExtraField::FIELD_TYPE_TAG) {
+        if (1 == $extra_field[8] && ExtraField::FIELD_TYPE_TAG == $extra_field[2]) {
             $options = UserManager::get_extra_user_data_for_tags($extra_field[1]);
 
             $new_field_list[] = [
@@ -88,15 +86,15 @@ if (isset($_POST['form_sent']) && $_POST['form_sent']) {
         $users[$key] = intval($value);
     }
 
-    if ($form_sent == 1) {
-        if (count($users) == 0 || count($courses) == 0) {
+    if (1 == $form_sent) {
+        if (0 == count($users) || 0 == count($courses)) {
             echo Display::return_message(get_lang('You must select at least one user and one course'), 'error');
         } else {
             $errorDrh = 0;
             foreach ($courses as $course_code) {
                 foreach ($users as $user_id) {
                     $user = api_get_user_info($user_id);
-                    if ($user['status'] != DRH) {
+                    if (DRH != $user['status']) {
                         CourseManager::subscribeUser($user_id, $course_code);
                     } else {
                         $errorDrh = 1;
@@ -104,7 +102,7 @@ if (isset($_POST['form_sent']) && $_POST['form_sent']) {
                 }
             }
 
-            if ($errorDrh == 0) {
+            if (0 == $errorDrh) {
                 echo Display::return_message(get_lang('The selected users are subscribed to the selected course'), 'confirm');
             } else {
                 echo Display::return_message(get_lang('Human resources managers should not be registered to courses. The corresponding users you selected have not been subscribed.'), 'error');
@@ -137,9 +135,9 @@ if (is_array($extra_field_list)) {
             $varname = 'field_'.$new_field['variable'];
             $fieldtype = $new_field['type'];
             if (UserManager::is_extra_field_available($new_field['variable'])) {
-                if (isset($_POST[$varname]) && $_POST[$varname] != '0') {
+                if (isset($_POST[$varname]) && '0' != $_POST[$varname]) {
                     $use_extra_fields = true;
-                    if ($fieldtype == ExtraField::FIELD_TYPE_TAG) {
+                    if (ExtraField::FIELD_TYPE_TAG == $fieldtype) {
                         $extra_field_result[] = UserManager::get_extra_user_data_by_tags(
                             intval($_POST['field_id']),
                             $_POST[$varname]
@@ -189,7 +187,7 @@ $target_name = 'lastname';
 $orderBy = $target_name;
 $showOfficialCode = false;
 $orderListByOfficialCode = api_get_setting('order_user_list_by_official_code');
-if ($orderListByOfficialCode === 'true') {
+if ('true' === $orderListByOfficialCode) {
     $showOfficialCode = true;
     $orderBy = " official_code, lastname, firstname";
 }
@@ -202,7 +200,7 @@ $sql = "SELECT user_id, lastname, firstname, username, official_code
 if (api_is_multiple_url_enabled()) {
     $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
     $access_url_id = api_get_current_access_url_id();
-    if ($access_url_id != -1) {
+    if (-1 != $access_url_id) {
         $sql = "SELECT u.user_id,lastname,firstname,username, official_code
                 FROM $tbl_user u
                 INNER JOIN $tbl_user_rel_access_url user_rel_url
@@ -228,7 +226,7 @@ $sql = "SELECT code,visual_code,title
 if (api_is_multiple_url_enabled()) {
     $tbl_course_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
     $access_url_id = api_get_current_access_url_id();
-    if ($access_url_id != -1) {
+    if (-1 != $access_url_id) {
         $sql = "SELECT code, visual_code, title
                 FROM $tbl_course as course
                 INNER JOIN $tbl_course_rel_access_url course_rel_url
@@ -257,7 +255,7 @@ if (is_array($extra_field_list)) {
             echo '<option value="0">--'.get_lang('Select').'--</option>';
             foreach ($new_field['data'] as $option) {
                 $checked = '';
-                if ($fieldtype == ExtraField::FIELD_TYPE_TAG) {
+                if (ExtraField::FIELD_TYPE_TAG == $fieldtype) {
                     if (isset($_POST[$varname])) {
                         if ($_POST[$varname] == $option['tag']) {
                             $checked = 'selected="true"';
@@ -274,7 +272,7 @@ if (is_array($extra_field_list)) {
                 }
             }
             echo '</select>';
-            $extraHidden = $fieldtype == ExtraField::FIELD_TYPE_TAG ? '<input type="hidden" name="field_id" value="'.$option['field_id'].'" />' : '';
+            $extraHidden = ExtraField::FIELD_TYPE_TAG == $fieldtype ? '<input type="hidden" name="field_id" value="'.$option['field_id'].'" />' : '';
             echo $extraHidden;
             echo '&nbsp;&nbsp;';
         }
diff --git a/public/main/admin/system_announcements.php b/public/main/admin/system_announcements.php
index ca8aa4d31c..bb424f61cf 100644
--- a/public/main/admin/system_announcements.php
+++ b/public/main/admin/system_announcements.php
@@ -4,8 +4,6 @@
 
 /**
  * This page allows the administrator to manage the system announcements.
- *
- * @package chamilo.admin.announcement
  */
 
 // Resetting the course id.
@@ -44,13 +42,13 @@ if (!empty($action)) {
         "url" => "system_announcements.php",
         "name" => get_lang('Portal news'),
     ];
-    if ($action == 'add') {
+    if ('add' == $action) {
         $interbreadcrumb[] = [
             "url" => '#',
             "name" => get_lang('Add an announcement'),
         ];
     }
-    if ($action == 'edit') {
+    if ('edit' == $action) {
         $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Edit')];
     }
 } else {
@@ -87,7 +85,7 @@ function showCareer() {
 
 // Displaying the header.
 Display::display_header($tool_name);
-if ($action != 'add' && $action != 'edit') {
+if ('add' != $action && 'edit' != $action) {
     echo '<div class="actions">';
     echo '<a href="?action=add">'.Display::return_icon('add.png', get_lang('Add an announcement'), [], 32).'</a>';
     echo '</div>';
@@ -107,7 +105,7 @@ switch ($action) {
     case 'make_visible':
     case 'make_invisible':
         $status = false;
-        if ($action == 'make_visible') {
+        if ('make_visible' == $action) {
             $status = true;
         }
 
@@ -172,10 +170,10 @@ switch ($action) {
 }
 
 if ($action_todo) {
-    if (isset($_REQUEST['action']) && $_REQUEST['action'] == 'add') {
+    if (isset($_REQUEST['action']) && 'add' == $_REQUEST['action']) {
         $form_title = get_lang('Add news');
         $url = api_get_self();
-    } elseif (isset($_REQUEST['action']) && $_REQUEST['action'] == 'edit') {
+    } elseif (isset($_REQUEST['action']) && 'edit' == $_REQUEST['action']) {
         $form_title = get_lang('Edit News');
         $url = api_get_self().'?id='.intval($_GET['id']);
     }
@@ -316,12 +314,12 @@ if ($action_todo) {
     $values['group'] = isset($values['group']) ? $values['group'] : '0';
     $form->addElement('checkbox', 'send_mail', null, get_lang('Send mail'));
 
-    if (isset($_REQUEST['action']) && $_REQUEST['action'] == 'add') {
+    if (isset($_REQUEST['action']) && 'add' == $_REQUEST['action']) {
         $form->addElement('checkbox', 'add_to_calendar', null, get_lang('Add to calendar'));
         $text = get_lang('Add news');
         $class = 'add';
         $form->addElement('hidden', 'action', 'add');
-    } elseif (isset($_REQUEST['action']) && $_REQUEST['action'] == 'edit') {
+    } elseif (isset($_REQUEST['action']) && 'edit' == $_REQUEST['action']) {
         $text = get_lang('Edit News');
         $class = 'save';
         $form->addElement('hidden', 'action', 'edit');
@@ -340,7 +338,7 @@ if ($action_todo) {
             $visibilityResult[$key] = (int) $values[$key];
         }
 
-        if ($values['lang'] == 'all') {
+        if ('all' == $values['lang']) {
             $values['lang'] = null;
         }
 
@@ -360,7 +358,7 @@ if ($action_todo) {
                     empty($values['send_email_test']) ? false : true
                 );
 
-                if ($announcement_id !== false) {
+                if (false !== $announcement_id) {
                     // ADD Picture
                     $picture = $_FILES['picture'];
                     if (!empty($picture['name'])) {
diff --git a/public/main/admin/teachers_time_by_session_report.php b/public/main/admin/teachers_time_by_session_report.php
index b82a1232b3..837c4cd21c 100644
--- a/public/main/admin/teachers_time_by_session_report.php
+++ b/public/main/admin/teachers_time_by_session_report.php
@@ -7,8 +7,6 @@ use Doctrine\Common\Collections\Criteria;
 
 /**
  * Generate a teacher time report in platform by session only.
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 
diff --git a/public/main/admin/update_schema.php b/public/main/admin/update_schema.php
index df58d8c5f4..aee5a2ed32 100644
--- a/public/main/admin/update_schema.php
+++ b/public/main/admin/update_schema.php
@@ -8,7 +8,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 // Access restrictions
 api_protect_admin_script(true);
 
-if (api_get_configuration_value('sync_db_with_schema') != true) {
+if (true != api_get_configuration_value('sync_db_with_schema')) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/admin/user_add.php b/public/main/admin/user_add.php
index 8549a122f4..fa1699abe6 100644
--- a/public/main/admin/user_add.php
+++ b/public/main/admin/user_add.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.admin
- */
 $cidReset = true;
 // Including necessary libraries.
 require_once __DIR__.'/../inc/global.inc.php';
@@ -141,11 +138,11 @@ $form->applyFilter('official_code', 'trim');
 // e-mail
 $form->addElement('text', 'email', get_lang('e-mail'), ['size' => '40', 'autocomplete' => 'off', 'id' => 'email']);
 $form->addRule('email', get_lang('e-mailWrong'), 'email');
-if (api_get_setting('registration', 'email') == 'true') {
+if ('true' == api_get_setting('registration', 'email')) {
     $form->addRule('email', get_lang('e-mailWrong'), 'required');
 }
 
-if (api_get_setting('login_is_email') == 'true') {
+if ('true' == api_get_setting('login_is_email')) {
     $form->addRule('email', sprintf(get_lang('The login needs to be maximum %s characters long'), (string) USERNAME_MAX_LENGTH), 'maxlength', USERNAME_MAX_LENGTH);
     $form->addRule('email', get_lang('This login is already in use'), 'username_available');
 }
@@ -163,7 +160,7 @@ $allowed_picture_types = api_get_supported_image_extensions(false);
 $form->addRule('picture', get_lang('Only PNG, JPG or GIF images allowed').' ('.implode(',', $allowed_picture_types).')', 'filetype', $allowed_picture_types);
 
 // Username
-if (api_get_setting('login_is_email') != 'true') {
+if ('true' != api_get_setting('login_is_email')) {
     $form->addElement('text', 'username', get_lang('Login'), ['id' => 'username', 'maxlength' => USERNAME_MAX_LENGTH, 'autocomplete' => 'off']);
     $form->addRule('username', get_lang('Required field'), 'required');
     $form->addRule('username', sprintf(get_lang('The login needs to be maximum %s characters long'), (string) USERNAME_MAX_LENGTH), 'maxlength', USERNAME_MAX_LENGTH);
@@ -182,7 +179,7 @@ if (isset($extAuthSource) && count($extAuthSource) > 0) {
         // Special case for CAS. CAS is activated from Chamilo > Administration > Configuration > CAS
         // extAuthSource always on for CAS even if not activated
         // same action for file user_edit.php
-        if (($key == CAS_AUTH_SOURCE && api_get_setting('cas_activate') === 'true') || ($key != CAS_AUTH_SOURCE)) {
+        if ((CAS_AUTH_SOURCE == $key && 'true' === api_get_setting('cas_activate')) || (CAS_AUTH_SOURCE != $key)) {
             $auth_sources[$key] = $key;
             $nb_ext_auth_source_added++;
         }
@@ -245,7 +242,7 @@ $form->addElement(
 );
 
 //drh list (display only if student)
-$display = (isset($_POST['status']) && $_POST['status'] == STUDENT) || !isset($_POST['status']) ? 'block' : 'none';
+$display = (isset($_POST['status']) && STUDENT == $_POST['status']) || !isset($_POST['status']) ? 'block' : 'none';
 
 //@todo remove the drh list here. This code is unused
 $form->addElement('html', '<div id="drh_list" style="display:'.$display.';">');
@@ -368,28 +365,28 @@ if ($form->validate()) {
         $hr_dept_id = isset($user['hr_dept_id']) ? (int) $user['hr_dept_id'] : 0;
 
         if (isset($extAuthSource) && count($extAuthSource) > 0 &&
-            $user['password']['password_auto'] == '2'
+            '2' == $user['password']['password_auto']
         ) {
             $auth_source = $user['password']['auth_source'];
             $password = 'PLACEHOLDER';
         } else {
             $auth_source = PLATFORM_AUTH_SOURCE;
-            $password = $user['password']['password_auto'] == '1' ? api_generate_password() : $user['password']['password'];
+            $password = '1' == $user['password']['password_auto'] ? api_generate_password() : $user['password']['password'];
         }
 
         $expiration_date = null;
-        if ($user['radio_expiration_date'] == '1') {
+        if ('1' == $user['radio_expiration_date']) {
             $expiration_date = $user['expiration_date'];
         }
 
         $active = (int) $user['active'];
-        if (api_get_setting('login_is_email') == 'true') {
+        if ('true' == api_get_setting('login_is_email')) {
             $username = $email;
         }
 
         $extra = [];
         foreach ($user as $key => $value) {
-            if (substr($key, 0, 6) == 'extra_') {
+            if ('extra_' == substr($key, 0, 6)) {
                 // An extra field
                 $extra[substr($key, 6)] = $value;
             }
diff --git a/public/main/admin/user_edit.php b/public/main/admin/user_edit.php
index 5ef41e57b1..45b0ad8608 100644
--- a/public/main/admin/user_edit.php
+++ b/public/main/admin/user_edit.php
@@ -3,9 +3,6 @@
 
 use ChamiloSession as Session;
 
-/**
- * @package chamilo.admin
- */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -80,7 +77,7 @@ $sql = "SELECT u.*, a.user_id AS is_admin FROM $table_user u
         LEFT JOIN $table_admin a ON a.user_id = u.id
         WHERE u.id = '".$user_id."'";
 $res = Database::query($sql);
-if (Database::num_rows($res) != 1) {
+if (1 != Database::num_rows($res)) {
     header('Location: user_list.php');
     exit;
 }
@@ -136,11 +133,11 @@ $form->applyFilter('official_code', 'trim');
 // e-mail
 $form->addElement('text', 'email', get_lang('e-mail'));
 $form->addRule('email', get_lang('e-mailWrong'), 'email');
-if (api_get_setting('registration', 'email') == 'true') {
+if ('true' == api_get_setting('registration', 'email')) {
     $form->addRule('email', get_lang('e-mailWrong'), 'required');
 }
 
-if (api_get_setting('login_is_email') == 'true') {
+if ('true' == api_get_setting('login_is_email')) {
     $form->addRule('email', sprintf(get_lang('The login needs to be maximum %s characters long'), (string) USERNAME_MAX_LENGTH), 'maxlength', USERNAME_MAX_LENGTH);
     $form->addRule('email', get_lang('This login is already in use'), 'username_available', $user_data['username']);
 }
@@ -167,7 +164,7 @@ if (strlen($user_data['picture_uri']) > 0) {
 }
 
 // Username
-if (api_get_setting('login_is_email') != 'true') {
+if ('true' != api_get_setting('login_is_email')) {
     $form->addElement('text', 'username', get_lang('Login'), ['maxlength' => USERNAME_MAX_LENGTH]);
     $form->addRule('username', get_lang('Required field'), 'required');
     $form->addRule('username', sprintf(get_lang('The login needs to be maximum %s characters long'), (string) USERNAME_MAX_LENGTH), 'maxlength', USERNAME_MAX_LENGTH);
@@ -192,7 +189,7 @@ if (isset($extAuthSource) && !empty($extAuthSource) && count($extAuthSource) > 0
         // Special case for CAS. CAS is activated from Chamilo > Administration > Configuration > CAS
         // extAuthSource always on for CAS even if not activated
         // same action for file user_add.php
-        if (($key == CAS_AUTH_SOURCE && api_get_setting('cas_activate') === 'true') || ($key != CAS_AUTH_SOURCE)) {
+        if ((CAS_AUTH_SOURCE == $key && 'true' === api_get_setting('cas_activate')) || (CAS_AUTH_SOURCE != $key)) {
             $auth_sources[$key] = $key;
             $nb_ext_auth_source_added++;
         }
@@ -238,7 +235,7 @@ $form->addElement(
     ]
 );
 
-$display = isset($user_data['status']) && ($user_data['status'] == STUDENT || (isset($_POST['status']) && $_POST['status'] == STUDENT)) ? 'block' : 'none';
+$display = isset($user_data['status']) && (STUDENT == $user_data['status'] || (isset($_POST['status']) && STUDENT == $_POST['status'])) ? 'block' : 'none';
 
 // Platform admin
 if (api_is_platform_admin()) {
@@ -246,7 +243,7 @@ if (api_is_platform_admin()) {
     $group[] = $form->createElement('radio', 'platform_admin', null, get_lang('Yes'), 1);
     $group[] = $form->createElement('radio', 'platform_admin', null, get_lang('No'), 0);
 
-    $user_data['status'] == 1 ? $display = 'block' : $display = 'none';
+    1 == $user_data['status'] ? $display = 'block' : $display = 'none';
 
     $form->addElement('html', '<div id="id_platform_admin" style="display:'.$display.'">');
     $form->addGroup($group, 'admin', get_lang('Administration'), null, false);
@@ -367,7 +364,7 @@ $error_drh = false;
 if ($form->validate()) {
     $user = $form->getSubmitValues(1);
     $reset_password = intval($user['reset_password']);
-    if ($reset_password == 2 && empty($user['password'])) {
+    if (2 == $reset_password && empty($user['password'])) {
         Display::addFlash(Display::return_message(get_lang('The password is too short')));
         header('Location: '.api_get_self().'?user_id='.$user_id);
         exit();
@@ -375,7 +372,7 @@ if ($form->validate()) {
 
     $is_user_subscribed_in_course = CourseManager::is_user_subscribed_in_course($user['user_id']);
 
-    if ($user['status'] == DRH && $is_user_subscribed_in_course) {
+    if (DRH == $user['status'] && $is_user_subscribed_in_course) {
         $error_drh = true;
     } else {
         $picture_element = $form->getElement('picture');
@@ -409,7 +406,7 @@ if ($form->validate()) {
         $language = $user['language'];
         $address = isset($user['address']) ? $user['address'] : null;
 
-        if (!$user_data['platform_admin'] && $user['radio_expiration_date'] == '1') {
+        if (!$user_data['platform_admin'] && '1' == $user['radio_expiration_date']) {
             $expiration_date = $user['expiration_date'];
         } else {
             $expiration_date = null;
@@ -418,11 +415,11 @@ if ($form->validate()) {
         $active = $user_data['platform_admin'] ? 1 : intval($user['active']);
 
         //If the user is set to admin the status will be overwrite by COURSEMANAGER = 1
-        if ($platform_admin == 1) {
+        if (1 == $platform_admin) {
             $status = COURSEMANAGER;
         }
 
-        if (api_get_setting('login_is_email') == 'true') {
+        if ('true' == api_get_setting('login_is_email')) {
             $username = $email;
         }
 
@@ -467,7 +464,7 @@ if ($form->validate()) {
         UserManager::add_user_as_admin($userObj);
 
         if ($user_id != $currentUserId) {
-            if ($platform_admin == 1) {
+            if (1 == $platform_admin) {
                 $userObj = api_get_user_entity($user_id);
                 UserManager::add_user_as_admin($userObj);
             } else {
diff --git a/public/main/admin/user_export.php b/public/main/admin/user_export.php
index bdc300fac7..9c4cf71afb 100644
--- a/public/main/admin/user_export.php
+++ b/public/main/admin/user_export.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.admin
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
@@ -35,7 +32,7 @@ global $_configuration;
 if (api_is_multiple_url_enabled()) {
     $tbl_course_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
     $access_url_id = api_get_current_access_url_id();
-    if ($access_url_id != -1) {
+    if (-1 != $access_url_id) {
         $sql = "SELECT code,visual_code,title
             FROM $course_table as c
             INNER JOIN $tbl_course_rel_access_url as course_rel_url
@@ -86,7 +83,7 @@ if ($form->validate()) {
                 u.firstname 	AS FirstName,
                 u.email 		AS Email,
                 u.username	AS UserName,
-                ".(($_configuration['password_encryption'] != 'none') ? " " : "u.password AS Password, ")."
+                ".(('none' != $_configuration['password_encryption']) ? " " : "u.password AS Password, ")."
                 u.auth_source	AS AuthSource,
                 u.status		AS Status,
                 u.official_code	AS OfficialCode,
@@ -112,7 +109,7 @@ if ($form->validate()) {
         if (api_is_multiple_url_enabled()) {
             $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql .= " FROM $user_table u
                           INNER JOIN $tbl_user_rel_access_url as user_rel_url
                           ON (u.user_id= user_rel_url.user_id)
@@ -128,8 +125,8 @@ if ($form->validate()) {
     $extra_fields = UserManager::get_extra_fields(0, 0, 5, 'ASC', false);
 
     if (!empty($export['addcsvheader'])) {
-        if ($export['addcsvheader'] == '1' && ($export['file_type'] == 'csv' || $export['file_type'] == 'xls')) {
-            if ($_configuration['password_encryption'] != 'none') {
+        if ('1' == $export['addcsvheader'] && ('csv' == $export['file_type'] || 'xls' == $export['file_type'])) {
+            if ('none' != $_configuration['password_encryption']) {
                 $data[] = [
                     'UserId',
                     'LastName',
diff --git a/public/main/admin/user_import.php b/public/main/admin/user_import.php
index adbc5528fd..e0e4c88af4 100644
--- a/public/main/admin/user_import.php
+++ b/public/main/admin/user_import.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 
 /**
  * This tool allows platform admins to add users by uploading a CSV or XML file.
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -33,7 +31,7 @@ function validate_data($users, $checkUniqueEmail = false)
 
     // 1. Check if mandatory fields are set.
     $mandatory_fields = ['LastName', 'FirstName'];
-    if (api_get_setting('registration', 'email') == 'true' || $checkUniqueEmail) {
+    if ('true' == api_get_setting('registration', 'email') || $checkUniqueEmail) {
         $mandatory_fields[] = 'Email';
     }
 
@@ -60,7 +58,7 @@ function validate_data($users, $checkUniqueEmail = false)
             }
             // 2.1.1
             $hasDash = strpos($username, '-');
-            if ($hasDash !== false) {
+            if (false !== $hasDash) {
                 $user['message'] .= Display::return_message(
                     get_lang('The username cannot contain the \' - \' character'),
                     'warning'
@@ -82,7 +80,7 @@ function validate_data($users, $checkUniqueEmail = false)
 
         if (isset($user['Email'])) {
             $result = api_valid_email($user['Email']);
-            if ($result === false) {
+            if (false === $result) {
                 $user['message'] .= Display::return_message(get_lang('Please enter a valid e-mail address !'), 'warning');
                 $user['has_error'] = true;
             }
@@ -356,7 +354,7 @@ function parse_csv_data($users, $fileName, $sendEmail = 0, $checkUniqueEmail = t
         $users = array_splice($users, 0, $readMax);
     }
 
-    if ($resumeImport === false) {
+    if (false === $resumeImport) {
         $users = $usersFromOrigin;
     }
 
@@ -435,7 +433,7 @@ function parse_xml_data($file)
     foreach ($crawler as $domElement) {
         $row = [];
         foreach ($domElement->childNodes as $node) {
-            if ($node->nodeName != '#text') {
+            if ('#text' != $node->nodeName) {
                 $row[$node->nodeName] = $node->nodeValue;
             }
         }
@@ -507,11 +505,11 @@ if (isset($extAuthSource) && is_array($extAuthSource)) {
 
 $tool_name = get_lang('Import users list');
 $interbreadcrumb[] = ['url' => 'index.php', 'name' => get_lang('Administration')];
-$reloadImport = (isset($_REQUEST['reload_import']) && (int) $_REQUEST['reload_import'] === 1);
+$reloadImport = (isset($_REQUEST['reload_import']) && 1 === (int) $_REQUEST['reload_import']);
 
 $extra_fields = UserManager::get_extra_fields(0, 0, 5, 'ASC', true);
 
-if (isset($_POST['formSent']) && $_POST['formSent'] && $_FILES['import_file']['size'] !== 0) {
+if (isset($_POST['formSent']) && $_POST['formSent'] && 0 !== $_FILES['import_file']['size']) {
     $file_type = $_POST['file_type'];
     Security::clear_token();
     $tok = Security::get_token();
@@ -526,7 +524,7 @@ if (isset($_POST['formSent']) && $_POST['formSent'] && $_FILES['import_file']['s
 
     $users = [];
     if (in_array($ext_import_file, $allowed_file_mimetype)) {
-        if (strcmp($file_type, 'csv') === 0 &&
+        if (0 === strcmp($file_type, 'csv') &&
             $ext_import_file == $allowed_file_mimetype[0]
         ) {
             Session::erase('user_import_data_'.$userId);
@@ -540,7 +538,7 @@ if (isset($_POST['formSent']) && $_POST['formSent'] && $_FILES['import_file']['s
             );
             $users = validate_data($users, $checkUniqueEmail);
             $error_kind_file = false;
-        } elseif (strcmp($file_type, 'xml') === 0 && $ext_import_file == $allowed_file_mimetype[1]) {
+        } elseif (0 === strcmp($file_type, 'xml') && $ext_import_file == $allowed_file_mimetype[1]) {
             $users = parse_xml_data($_FILES['import_file']['tmp_name']);
             $users = validate_data($users, $checkUniqueEmail);
             $error_kind_file = false;
@@ -622,7 +620,7 @@ if (!empty($importData)) {
 
     if ($isResume) {
         $resumeStop = $importData['counter'] >= count($importData['complete_list']);
-        if ($resumeStop == false) {
+        if (false == $resumeStop) {
             $formContinue->addButtonImport(get_lang('ContinueImport'), 'import_continue');
         }
     }
@@ -642,7 +640,7 @@ if (!empty($importData)) {
         processUsers($users, $importData['send_email']);
 
         $reload = '';
-        if ($isResume && $resumeStop === false) {
+        if ($isResume && false === $resumeStop) {
             $reload = '?reload_import=1';
         }
 
@@ -778,7 +776,7 @@ if (api_get_configuration_value('plugin_redirection_enabled')) {
         &lt;OfficialCode&gt;xxx&lt;/OfficialCode&gt;
         &lt;language&gt;english/spanish/(other)&lt;/language&gt;
         &lt;PhoneNumber&gt;xxx&lt;/PhoneNumber&gt;
-        &lt;Status&gt;user/teacher/drh&lt;/Status&gt;<?php if ($result_xml != '') {
+        &lt;Status&gt;user/teacher/drh&lt;/Status&gt;<?php if ('' != $result_xml) {
     echo '<br /><span style="color:red;">', $result_xml;
     echo '</span><br />';
 } ?>
diff --git a/public/main/admin/user_information.php b/public/main/admin/user_information.php
index 53dc5aa8c2..4463a5bf70 100644
--- a/public/main/admin/user_information.php
+++ b/public/main/admin/user_information.php
@@ -8,8 +8,6 @@ use Chamilo\UserBundle\Entity\User;
  * Script showing information about a user (name, e-mail, courses and sessions).
  *
  * @author Bart Mollet
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -158,7 +156,7 @@ $data = [
     get_lang('Phone') => $user['phone'],
     get_lang('Course code') => $user['official_code'],
     get_lang('Online') => !empty($user['user_is_online']) ? Display::return_icon('online.png') : Display::return_icon('offline.png'),
-    get_lang('Status') => $user['status'] == 1 ? get_lang('Trainer') : get_lang('Learner'),
+    get_lang('Status') => 1 == $user['status'] ? get_lang('Trainer') : get_lang('Learner'),
 ];
 
 $userInfo = [
@@ -167,7 +165,7 @@ $userInfo = [
     'phone' => $user['phone'],
     'official_code' => $user['official_code'],
     'user_is_online' => !empty($user['user_is_online']) ? Display::return_icon('online.png') : Display::return_icon('offline.png'),
-    'status' => $user['status'] == 1 ? get_lang('Trainer') : get_lang('Learner'),
+    'status' => 1 == $user['status'] ? get_lang('Trainer') : get_lang('Learner'),
     'avatar' => $user['avatar'],
 ];
 
@@ -204,7 +202,7 @@ $data = [
     get_lang('Latest login') => $userInfo['last_connection'],
 ];
 
-if (api_get_setting('allow_terms_conditions') === 'true') {
+if ('true' === api_get_setting('allow_terms_conditions')) {
     $extraFieldValue = new ExtraFieldValue('user');
     $value = $extraFieldValue->get_values_by_handler_and_field_variable(
         $userId,
@@ -250,12 +248,12 @@ foreach ($data as $label => $item) {
 /**
  * Show social activity.
  */
-if (api_get_setting('allow_social_tool') === 'true') {
+if ('true' === api_get_setting('allow_social_tool')) {
     $userObject = api_get_user_entity($userId);
     $data = [];
 
     // Calculate values
-    if (api_get_setting('allow_message_tool') === 'true') {
+    if ('true' === api_get_setting('allow_message_tool')) {
         $messagesSent = SocialManager::getCountMessagesSent($userId);
         $data[] = [get_lang('Number of messages sent'), $messagesSent];
         $messagesReceived = SocialManager::getCountMessagesReceived($userId);
@@ -342,7 +340,7 @@ if (count($sessions) > 0) {
                 '<a href="'.$courseInfo['course_public_url'].'?id_session='.$id_session.'">'.
                 Display::return_icon('course_home.png', get_lang('Course home')).'</a>';
 
-            if (!empty($my_course['status']) && $my_course['status'] == STUDENT) {
+            if (!empty($my_course['status']) && STUDENT == $my_course['status']) {
                 $tools .= '<a href="user_information.php?action=unsubscribe_session_course&course_id='.$courseInfo['real_id'].'&user_id='.$userId.'&id_session='.$id_session.'">'.
                     Display::return_icon('delete.png', get_lang('Delete')).'</a>';
             }
@@ -457,7 +455,7 @@ if (Database::num_rows($res) > 0) {
             Display::return_icon('course_home.png', get_lang('Course home')).'</a>'.
             '<a href="course_edit.php?id='.$course->c_id.'">'.
             Display::return_icon('edit.png', get_lang('Edit')).'</a>';
-        if ($course->status == STUDENT) {
+        if (STUDENT == $course->status) {
             $tools .= '<a href="user_information.php?action=unsubscribe&course_id='.$courseInfo['real_id'].'&user_id='.$userId.'">'.
                 Display::return_icon('delete.png', get_lang('Delete')).'</a>';
         }
@@ -478,7 +476,7 @@ if (Database::num_rows($res) > 0) {
         $row = [
             Display::url($courseCode, $courseInfo['course_public_url']),
             $course->title,
-            $course->status == STUDENT ? get_lang('Learner') : get_lang('Trainer'),
+            STUDENT == $course->status ? get_lang('Learner') : get_lang('Trainer'),
             $timeSpent,
             $totalForumMessages,
             $tools,
@@ -571,7 +569,7 @@ if (isset($_GET['action'])) {
                 break;
             }
 
-            if (CourseManager::getUserInCourseStatus($userId, $courseInfo['real_id']) == STUDENT) {
+            if (STUDENT == CourseManager::getUserInCourseStatus($userId, $courseInfo['real_id'])) {
                 CourseManager::unsubscribe_user($userId, $courseInfo['code'], $sessionId);
                 Display::addFlash(Display::return_message(get_lang('User is now unsubscribed')));
             } else {
@@ -658,7 +656,7 @@ if ($hrmList) {
     echo '</div>';
 }
 
-if ($user['status'] == DRH) {
+if (DRH == $user['status']) {
     $usersAssigned = UserManager::get_users_followed_by_drh($userId);
 
     if ($usersAssigned) {
diff --git a/public/main/admin/user_linking_requests.php b/public/main/admin/user_linking_requests.php
index 1d044d3725..3dee1d7dc7 100644
--- a/public/main/admin/user_linking_requests.php
+++ b/public/main/admin/user_linking_requests.php
@@ -121,7 +121,7 @@ function getData(User $hrm, $status = HRM_REQUEST)
         $line = [];
         $studentLink = api_get_path(WEB_CODE_PATH).'mySpace/myStudents.php?student='.$request['user_id'];
         $line[] = '<a href="'.$studentLink.'">'.api_get_person_name($request['firstname'], $request['lastname']).'</a>';
-        if ($status == HRM_REQUEST) {
+        if (HRM_REQUEST == $status) {
             $line[] = Display::url(
                     $iconAccept,
                     $urlAccept.$request['user_id']
diff --git a/public/main/admin/user_list.php b/public/main/admin/user_list.php
index 57dc478120..c2ec46ead9 100644
--- a/public/main/admin/user_list.php
+++ b/public/main/admin/user_list.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * @author Bart Mollet
  * @author Julio Montoya <gugli100@gmail.com> BeezNest 2011
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -20,7 +18,7 @@ $currentUserId = api_get_user_id();
 $action = isset($_REQUEST['action']) ? $_REQUEST['action'] : '';
 
 // Login as can be used by different roles
-if (isset($_GET['user_id']) && $action == 'login_as') {
+if (isset($_GET['user_id']) && 'login_as' == $action) {
     $check = Security::check_token('get');
     if ($check && api_can_login_as($_GET['user_id'])) {
         $result = UserManager::loginAsUser($_GET['user_id']);
@@ -268,7 +266,7 @@ function prepare_user_sql_query($getCount)
         }
     }
 
-    if ($atLeastOne == false) {
+    if (false == $atLeastOne) {
         $keywordListValues = [];
     }
 
@@ -296,7 +294,7 @@ function prepare_user_sql_query($getCount)
         $keyword_admin = '';
 
         if (isset($keywordListValues['keyword_status']) &&
-            $keywordListValues['keyword_status'] == PLATFORM_ADMIN
+            PLATFORM_ADMIN == $keywordListValues['keyword_status']
         ) {
             $query_admin_table = " , $admin_table a ";
             $keyword_admin = ' AND a.user_id = u.id ';
@@ -341,7 +339,7 @@ function prepare_user_sql_query($getCount)
     }
 
     $preventSessionAdminsToManageAllUsers = api_get_setting('prevent_session_admins_to_manage_all_users');
-    if (api_is_session_admin() && $preventSessionAdminsToManageAllUsers === 'true') {
+    if (api_is_session_admin() && 'true' === $preventSessionAdminsToManageAllUsers) {
         $sql .= ' AND u.creator_id = '.$currentUserId;
     }
 
@@ -374,7 +372,7 @@ function prepare_user_sql_query($getCount)
                     if (empty($value)) {
                         continue;
                     }
-                    if ($info['field_type'] == ExtraField::FIELD_TYPE_TAG) {
+                    if (ExtraField::FIELD_TYPE_TAG == $info['field_type']) {
                         $result = $extraField->getAllUserPerTag(
                             $info['id'],
                             $value
@@ -468,7 +466,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
             alt="'.api_get_person_name($user[2], $user[3]).'"
             title="'.api_get_person_name($user[2], $user[3]).'" />';
 
-        if ($user[7] == 1 && !empty($user['exp'])) {
+        if (1 == $user[7] && !empty($user['exp'])) {
             // check expiration date
             $expiration_time = convert_sql_date($user['exp']);
             // if expiration date is passed, store a special value for active field
@@ -805,20 +803,20 @@ function active_filter($active, $params, $row)
 {
     $_user = api_get_user_info();
 
-    if ($active == '1') {
+    if ('1' == $active) {
         $action = 'Lock';
         $image = 'accept';
-    } elseif ($active == '-1') {
+    } elseif ('-1' == $active) {
         $action = 'edit';
         $image = 'warning';
-    } elseif ($active == '0') {
+    } elseif ('0' == $active) {
         $action = 'Unlock';
         $image = 'error';
     }
 
     $result = '';
 
-    if ($action === 'edit') {
+    if ('edit' === $action) {
         $result = Display::return_icon(
             $image.'.png',
             get_lang('Account expired'),
@@ -1116,7 +1114,7 @@ $table->set_column_filter(8, 'active_filter');
 $table->set_column_filter(11, 'modify_filter');
 
 // Hide email column if login is email, to avoid column with same data
-if (api_get_setting('login_is_email') === 'true') {
+if ('true' === api_get_setting('login_is_email')) {
     $table->setHideColumn(6);
 }
 
@@ -1135,7 +1133,7 @@ $table_result = $table->return_table();
 $extra_search_options = '';
 
 // Try to search the user everywhere
-if ($table->get_total_number_of_items() == 0) {
+if (0 == $table->get_total_number_of_items()) {
     if (api_get_multiple_access_url() && isset($_REQUEST['keyword'])) {
         $keyword = Database::escape_string($_REQUEST['keyword']);
         $conditions = ['username' => $keyword];
diff --git a/public/main/admin/user_list_consent.php b/public/main/admin/user_list_consent.php
index dfa022293f..a666631a87 100644
--- a/public/main/admin/user_list_consent.php
+++ b/public/main/admin/user_list_consent.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * @author Bart Mollet
  * @author Julio Montoya <gugli100@gmail.com> BeezNest 2011
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -100,7 +98,7 @@ function prepare_user_sql_query($getCount)
         }
     }
 
-    if ($atLeastOne == false) {
+    if (false == $atLeastOne) {
         $keywordListValues = [];
     }
 
@@ -121,7 +119,7 @@ function prepare_user_sql_query($getCount)
         $keyword_admin = '';
 
         if (isset($keywordListValues['keyword_status']) &&
-            $keywordListValues['keyword_status'] == PLATFORM_ADMIN
+            PLATFORM_ADMIN == $keywordListValues['keyword_status']
         ) {
             $query_admin_table = " , $admin_table a ";
             $keyword_admin = ' AND a.user_id = u.id ';
@@ -159,7 +157,7 @@ function prepare_user_sql_query($getCount)
     }
 
     $preventSessionAdminsToManageAllUsers = api_get_setting('prevent_session_admins_to_manage_all_users');
-    if (api_is_session_admin() && $preventSessionAdminsToManageAllUsers === 'true') {
+    if (api_is_session_admin() && 'true' === $preventSessionAdminsToManageAllUsers) {
         $sql .= " AND u.creator_id = ".api_get_user_id();
     }
 
@@ -225,7 +223,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
             alt="'.api_get_person_name($user[2], $user[3]).'" 
             title="'.api_get_person_name($user[2], $user[3]).'" />';
 
-        if ($user[7] == 1 && !empty($user[10])) {
+        if (1 == $user[7] && !empty($user[10])) {
             // check expiration date
             $expiration_time = convert_sql_date($user[10]);
             // if expiration date is passed, store a special value for active field
@@ -396,20 +394,20 @@ function active_filter($active, $params, $row)
 {
     $_user = api_get_user_info();
 
-    if ($active == '1') {
+    if ('1' == $active) {
         $action = 'Lock';
         $image = 'accept';
-    } elseif ($active == '-1') {
+    } elseif ('-1' == $active) {
         $action = 'edit';
         $image = 'warning';
-    } elseif ($active == '0') {
+    } elseif ('0' == $active) {
         $action = 'Unlock';
         $image = 'error';
     }
 
     $result = '';
 
-    if ($action === 'edit') {
+    if ('edit' === $action) {
         $result = Display::return_icon(
             $image.'.png',
             get_lang('Account expired'),
diff --git a/public/main/admin/user_move_stats.php b/public/main/admin/user_move_stats.php
index 3f8e4a792f..90f13d7f8c 100644
--- a/public/main/admin/user_move_stats.php
+++ b/public/main/admin/user_move_stats.php
@@ -3,8 +3,6 @@
 
 /**
  * User move script (to move between courses and sessions).
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -19,18 +17,18 @@ function compare_data($result_message)
 {
     foreach ($result_message as $table => $data) {
         $title = $table;
-        if ($table == 'TRACK_E_EXERCISES') {
+        if ('TRACK_E_EXERCISES' == $table) {
             $title = get_lang('Tests');
-        } elseif ($table == 'TRACK_E_EXERCISES_IN_LP') {
+        } elseif ('TRACK_E_EXERCISES_IN_LP' == $table) {
             $title = get_lang('TestsInLp');
-        } elseif ($table == 'LP_VIEW') {
+        } elseif ('LP_VIEW' == $table) {
             $title = get_lang('Learning paths');
         }
         echo '<br / ><h3>'.get_lang($title).' </h3><hr />';
 
         if (is_array($data)) {
             foreach ($data as $id => $item) {
-                if ($table == 'TRACK_E_EXERCISES' || $table == 'TRACK_E_EXERCISES_IN_LP') {
+                if ('TRACK_E_EXERCISES' == $table || 'TRACK_E_EXERCISES_IN_LP' == $table) {
                     echo "<br /><h3>".get_lang('Attempt')." #$id</h3>";
                     echo '<h3>';
                     echo get_lang('Test').' #'.$item['exe_exo_id'];
@@ -102,7 +100,7 @@ if (isset($_REQUEST['load_ajax'])) {
             $result_message_compare = [];
 
             $update_database = true;
-            if (isset($_REQUEST['view_stat']) && $_REQUEST['view_stat'] == 1) {
+            if (isset($_REQUEST['view_stat']) && 1 == $_REQUEST['view_stat']) {
                 $update_database = false;
             }
 
@@ -610,7 +608,7 @@ if (isset($_REQUEST['load_ajax'])) {
                     echo '<tr>';
                     echo '<td width="50%" valign="top">';
 
-                    if ($origin_session_id == 0) {
+                    if (0 == $origin_session_id) {
                         echo '<h4>'.get_lang('Original course').'</h4>';
                     } else {
                         echo '<h4>'.get_lang('Original session').' #'.$origin_session_id.'</h4>';
@@ -618,7 +616,7 @@ if (isset($_REQUEST['load_ajax'])) {
                     compare_data($result_message);
                     echo '</td>';
                     echo '<td width="50%" valign="top">';
-                    if ($new_session_id == 0) {
+                    if (0 == $new_session_id) {
                         echo '<h4>'.get_lang('Destination course').'</h4>';
                     } else {
                         echo '<h4>'.get_lang('Destination session').' #'.$new_session_id.'</h4>';
diff --git a/public/main/admin/user_update_import.php b/public/main/admin/user_update_import.php
index 639b2de1df..8bb8ba0753 100644
--- a/public/main/admin/user_update_import.php
+++ b/public/main/admin/user_update_import.php
@@ -4,8 +4,6 @@
 
 /**
  * This tool allows platform admins to add users by uploading a CSV or XML file.
- *
- * @package chamilo.admin
  */
 
 /**
@@ -26,7 +24,7 @@ function validate_data($users)
     // 1. Check if mandatory fields are set.
     $mandatory_fields = ['LastName', 'FirstName'];
 
-    if (api_get_setting('registration', 'email') == 'true') {
+    if ('true' == api_get_setting('registration', 'email')) {
         $mandatory_fields[] = 'Email';
     }
     $classExistList = [];
@@ -153,7 +151,7 @@ function updateUsers($users)
             $userName = $user['UserName'];
             $userInfo = api_get_user_info_from_username($userName);
             $user_id = $userInfo['user_id'];
-            if ($user_id == 0) {
+            if (0 == $user_id) {
                 return false;
             }
             $firstName = isset($user['FirstName']) ? $user['FirstName'] : $userInfo['firstname'];
@@ -165,7 +163,7 @@ function updateUsers($users)
                 $changePassMethod = 2;
             }
             $authSource = isset($user['AuthSource']) ? $user['AuthSource'] : '';
-            if ($changePassMethod === 2 && !empty($authSource) && $authSource != $userInfo['auth_source']) {
+            if (2 === $changePassMethod && !empty($authSource) && $authSource != $userInfo['auth_source']) {
                 $changePassMethod = 3;
             }
             $email = isset($user['Email']) ? $user['Email'] : $userInfo['email'];
@@ -272,7 +270,7 @@ function parse_xml_data($file)
     foreach ($crawler as $domElement) {
         $row = [];
         foreach ($domElement->childNodes as $node) {
-            if ($node->nodeName != '#text') {
+            if ('#text' != $node->nodeName) {
                 $row[$node->nodeName] = $node->nodeValue;
             }
         }
@@ -301,7 +299,7 @@ $extra_fields = UserManager::get_extra_fields(0, 0, 5, 'ASC', true);
 $user_id_error = [];
 $error_message = '';
 
-if (isset($_POST['formSent']) && $_POST['formSent'] && $_FILES['import_file']['size'] !== 0) {
+if (isset($_POST['formSent']) && $_POST['formSent'] && 0 !== $_FILES['import_file']['size']) {
     $file_type = 'csv';
     Security::clear_token();
     $tok = Security::get_token();
@@ -312,11 +310,11 @@ if (isset($_POST['formSent']) && $_POST['formSent'] && $_FILES['import_file']['s
     $ext_import_file = $uploadInfo['extension'];
 
     if (in_array($ext_import_file, $allowed_file_mimetype)) {
-        if (strcmp($file_type, 'csv') === 0 && $ext_import_file == $allowed_file_mimetype[0]) {
+        if (0 === strcmp($file_type, 'csv') && $ext_import_file == $allowed_file_mimetype[0]) {
             $users = parse_csv_data($_FILES['import_file']['tmp_name']);
             $errors = validate_data($users);
             $error_kind_file = false;
-        } elseif (strcmp($file_type, 'xml') === 0 && $ext_import_file == $allowed_file_mimetype[1]) {
+        } elseif (0 === strcmp($file_type, 'xml') && $ext_import_file == $allowed_file_mimetype[1]) {
             $users = parse_xml_data($_FILES['import_file']['tmp_name']);
             $errors = validate_data($users);
             $error_kind_file = false;
@@ -345,7 +343,7 @@ if (isset($_POST['formSent']) && $_POST['formSent'] && $_FILES['import_file']['s
     }
 
     $inserted_in_course = [];
-    if (strcmp($file_type, 'csv') === 0) {
+    if (0 === strcmp($file_type, 'csv')) {
         updateUsers($users_to_insert);
     }
 
@@ -356,7 +354,7 @@ if (isset($_POST['formSent']) && $_POST['formSent'] && $_FILES['import_file']['s
     }
 
     $warning_message = '';
-    if (count($errors) != 0) {
+    if (0 != count($errors)) {
         $warning_message = '<ul>';
         foreach ($errors as $index => $error_user) {
             $warning_message .= '<li><b>'.$error_user['error'].'</b>: ';
diff --git a/public/main/admin/usergroup_export.php b/public/main/admin/usergroup_export.php
index 8cdc7ed534..09b149469e 100644
--- a/public/main/admin/usergroup_export.php
+++ b/public/main/admin/usergroup_export.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *	@package chamilo.admin
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/admin/usergroup_import.php b/public/main/admin/usergroup_import.php
index 3a15945c12..695d156c04 100644
--- a/public/main/admin/usergroup_import.php
+++ b/public/main/admin/usergroup_import.php
@@ -5,8 +5,6 @@
  *  This tool allows platform admins to add classes by uploading a CSV file.
  *
  * @todo Add some langvars to DLTT
- *
- * @package chamilo.admin
  */
 
 /**
@@ -18,7 +16,7 @@ function validate_data($classes)
     $usergroup = new UserGroup();
     foreach ($classes as $index => $class) {
         // 1. Check of class name is available.
-        if (!isset($class['name']) || strlen(trim($class['name'])) == 0) {
+        if (!isset($class['name']) || 0 == strlen(trim($class['name']))) {
             $class['line'] = $index + 2;
             $class['error'] = get_lang('Missing class name');
             $errors[] = $class;
@@ -109,7 +107,7 @@ $form->addButtonImport(get_lang('Import'));
 if ($form->validate()) {
     $classes = Import::csvToArray($_FILES['import_file']['tmp_name']);
     $errors = validate_data($classes);
-    if (count($errors) == 0) {
+    if (0 == count($errors)) {
         $number_of_added_classes = save_data($classes);
         Display::addFlash(Display::return_message($number_of_added_classes.' '.get_lang('Added'), 'normal'));
     } else {
diff --git a/public/main/admin/usergroup_user_import.php b/public/main/admin/usergroup_user_import.php
index 2bc71bf5f3..f478a5a880 100644
--- a/public/main/admin/usergroup_user_import.php
+++ b/public/main/admin/usergroup_user_import.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.admin
- */
+
 /**
  * Code
  * This tool allows platform admins to update class-user relations by uploading
@@ -25,14 +23,14 @@ function validate_data($user_classes)
         $mandatory_fields = ['UserName', 'ClassName'];
 
         foreach ($mandatory_fields as $field) {
-            if (!isset($user_class[$field]) || strlen($user_class[$field]) == 0) {
+            if (!isset($user_class[$field]) || 0 == strlen($user_class[$field])) {
                 $user_class['error'] = get_lang($field.'Mandatory');
                 $errors[] = $user_class;
             }
         }
 
         // 2. Check whether class code exists.
-        if (isset($user_class['ClassName']) && strlen($user_class['ClassName']) != 0) {
+        if (isset($user_class['ClassName']) && 0 != strlen($user_class['ClassName'])) {
             // 2.1 Check whether code has been already used in this CVS-file.
             if (!isset($classcodes[$user_class['ClassName']])) {
                 // 2.1.1 Check whether code exists in DB
@@ -157,7 +155,7 @@ $errors = [];
 if ($form->validate()) {
     $users_classes = parse_csv_data($_FILES['import_file']['tmp_name']);
     $errors = validate_data($users_classes);
-    if (count($errors) == 0) {
+    if (0 == count($errors)) {
         $deleteUsersNotInList = isset($_REQUEST['unsubscribe']) && !empty($_REQUEST['unsubscribe']) ? true : false;
         $return = save_data($users_classes, $deleteUsersNotInList);
     }
@@ -169,7 +167,7 @@ if (isset($return) && $return) {
     echo $return;
 }
 
-if (count($errors) != 0) {
+if (0 != count($errors)) {
     $error_message = "\n";
     foreach ($errors as $index => $error_class_user) {
         $error_message .= get_lang('Line').' '.$error_class_user['line'].': '.$error_class_user['error'].'</b>';
diff --git a/public/main/admin/usergroup_users.php b/public/main/admin/usergroup_users.php
index a298908600..fb26ff4fed 100644
--- a/public/main/admin/usergroup_users.php
+++ b/public/main/admin/usergroup_users.php
@@ -17,7 +17,7 @@ $usergroup->protectScript($userGroupInfo, true, true);
 $allowEdit = api_is_platform_admin() || isset($userGroupInfo['author_id']) && $userGroupInfo['author_id'] == api_get_user_id();
 
 $calendarPlugin = null;
-if ($allowEdit && api_get_plugin_setting('learning_calendar', 'enabled') === 'true') {
+if ($allowEdit && 'true' === api_get_plugin_setting('learning_calendar', 'enabled')) {
     $calendarPlugin = LearningCalendarPlugin::create();
 }
 
@@ -326,7 +326,7 @@ $(function() {
 
 $usergroup->showGroupTypeSetting = true;
 // Action handling: Adding a note
-if ($allowEdit && $action === 'delete' && is_numeric($_GET['id'])) {
+if ($allowEdit && 'delete' === $action && is_numeric($_GET['id'])) {
     $res = $usergroup->delete_user_rel_group($_GET['user_id'], $_GET['id']);
     Display::addFlash(Display::return_message(get_lang('Deleted'), 'confirmation'));
     header('Location: '.api_get_self().'?id='.$id);
diff --git a/public/main/admin/usergroups.php b/public/main/admin/usergroups.php
index 00fb4ba92c..1931878075 100644
--- a/public/main/admin/usergroups.php
+++ b/public/main/admin/usergroups.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
@@ -75,7 +72,7 @@ switch ($action) {
         $interbreadcrumb[] = ['url' => 'usergroups.php', 'name' => get_lang('Classes')];
         $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Add')];
 
-        if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+        if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
             api_not_allowed();
         }
         $form = new FormValidator(
diff --git a/public/main/announcements/announcements.php b/public/main/announcements/announcements.php
index d3c0656a8f..d6ae8e2453 100644
--- a/public/main/announcements/announcements.php
+++ b/public/main/announcements/announcements.php
@@ -14,7 +14,6 @@ use Chamilo\CourseBundle\Entity\CAnnouncement;
  *             Announcements tool and also add the resource linker here. The database also needed refactoring
  *             as there was no title field (the title was merged into the content field)
  */
-
 $use_anonymous = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/attendance/attendance_controller.php b/public/main/attendance/attendance_controller.php
index cd61ab0136..9cff8b882b 100644
--- a/public/main/attendance/attendance_controller.php
+++ b/public/main/attendance/attendance_controller.php
@@ -603,9 +603,9 @@ class AttendanceController
                     } else {
                         $result[$class_day['id']] = ' ';
                     }
-                    ++$cols;
+                    $cols++;
                 }
-                ++$count;
+                $count++;
                 $data_table[] = $result;
             }
         }
@@ -620,7 +620,7 @@ class AttendanceController
             $tables = [];
             $changed = 1;
 
-            for ($i = 0; $i <= $rows; ++$i) {
+            for ($i = 0; $i <= $rows; $i++) {
                 $row = isset($data_table[$i]) ? $data_table[$i] : null;
                 $key = 1;
                 $max_dates_per_page = 10;
@@ -630,14 +630,14 @@ class AttendanceController
                 if (!empty($item)) {
                     foreach ($item as $value) {
                         if ($count_j >= $max_dates_per_page) {
-                            ++$key;
+                            $key++;
                             $max_dates_per_page = $max_dates_per_page_original * $key;
                             //magic hack
                             $tables[$key][$i][] = $tables[1][$i][0];
                             $tables[$key][$i][] = $tables[1][$i][1];
                         }
                         $tables[$key][$i][] = $value;
-                        ++$count_j;
+                        $count_j++;
                     }
                 }
             }
diff --git a/public/main/attendance/attendance_sheet.php b/public/main/attendance/attendance_sheet.php
index 5953c248f4..1e7a1ca03d 100644
--- a/public/main/attendance/attendance_sheet.php
+++ b/public/main/attendance/attendance_sheet.php
@@ -251,7 +251,7 @@ if (api_is_allowed_to_edit(null, true) ||
                                 </td>
                             </tr>
                             <?php
-                            ++$i;
+                            $i++;
         } ?>
                         </tbody>
                     </table>
@@ -393,7 +393,7 @@ if (api_is_allowed_to_edit(null, true) ||
                         </td>';
             }
             echo '</tr>';
-            ++$i;
+            $i++;
         }
         echo '</tbody></table>';
         echo '</div></div>'; ?>
diff --git a/public/main/auth/catalog_layout.php b/public/main/auth/catalog_layout.php
index 0a1602e528..89c2d323fa 100644
--- a/public/main/auth/catalog_layout.php
+++ b/public/main/auth/catalog_layout.php
@@ -4,10 +4,8 @@
  * Layout (principal view) used for structuring course/session catalog.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.auth
  */
-if (api_get_setting('course_catalog_published') !== 'true') {
+if ('true' !== api_get_setting('course_catalog_published')) {
     // Access rights: anonymous users can't do anything usefull here.
     api_block_anonymous_users();
 }
diff --git a/public/main/auth/courses.php b/public/main/auth/courses.php
index 9f0d8b28c3..69729af1a8 100644
--- a/public/main/auth/courses.php
+++ b/public/main/auth/courses.php
@@ -23,14 +23,14 @@ $limit = CoursesController::getLimitArray();
 // Section for the tabs.
 $this_section = SECTION_CATALOG;
 
-if (api_get_setting('course_catalog_published') !== 'true') {
+if ('true' !== api_get_setting('course_catalog_published')) {
     // Access rights: anonymous users can't do anything useful here.
     api_block_anonymous_users();
 }
 
 // For students
 $user_can_view_page = true;
-if (api_get_setting('allow_students_to_browse_courses') === 'false') {
+if ('false' === api_get_setting('allow_students_to_browse_courses')) {
     $user_can_view_page = false;
 }
 
@@ -224,7 +224,7 @@ switch ($action) {
         }
 
         $registrationAllowed = api_get_setting('catalog_allow_session_auto_subscription');
-        if ($registrationAllowed === 'true') {
+        if ('true' === $registrationAllowed) {
             $entityManager = Database::getManager();
             $repository = $entityManager->getRepository('ChamiloCoreBundle:SequenceResource');
 
@@ -262,7 +262,7 @@ switch ($action) {
             if ($count <= 0) {
                 // no course in session -> return to catalog
                 $url = api_get_path(WEB_CODE_PATH).'auth/courses.php';
-            } elseif ($count == 1) {
+            } elseif (1 == $count) {
                 // only one course, so redirect directly to this course
                 foreach ($coursesList as $course) {
                     $url = api_get_path(WEB_COURSE_PATH).$course['directory'].'/index.php?id_session='.$sessionId;
diff --git a/public/main/auth/courses_categories.php b/public/main/auth/courses_categories.php
index fa23f757fa..5701f7a5e3 100644
--- a/public/main/auth/courses_categories.php
+++ b/public/main/auth/courses_categories.php
@@ -9,7 +9,7 @@ use Chamilo\CoreBundle\Framework\Container;
  *
  * @author Christian Fasanando <christian1827@gmail.com> - Beeznest
  */
-if (isset($_REQUEST['action']) && Security::remove_XSS($_REQUEST['action']) !== 'subscribe') {
+if (isset($_REQUEST['action']) && 'subscribe' !== Security::remove_XSS($_REQUEST['action'])) {
     $stok = Security::get_token();
 } else {
     $stok = Security::getTokenFromSession();
@@ -74,7 +74,7 @@ echo '<div class="row">
 
 if ($showCourses) {
     echo '<div class="col-md-'.($showSessions ? '4' : '6').'">';
-    if (!isset($_GET['hidden_links']) || intval($_GET['hidden_links']) != 1) {
+    if (!isset($_GET['hidden_links']) || 1 != intval($_GET['hidden_links'])) {
         ?>
         <form method="post"
               action="<?php echo CourseCategory::getCourseCategoryUrl(1, $pageLength, 'ALL', 0, 'subscribe'); ?>">
@@ -114,7 +114,7 @@ if ($showCourses) {
 
 echo '</div></div></div></div>';
 
-if ($showCourses && $action != 'display_sessions') {
+if ($showCourses && 'display_sessions' != $action) {
     if (!empty($message)) {
         echo Display::return_message($message, 'confirmation', false);
     }
@@ -130,7 +130,7 @@ if ($showCourses && $action != 'display_sessions') {
         echo "<p><strong>".get_lang('Search results for:')." ".$searchTerm."</strong><br />";
     }
 
-    $showTeacher = api_get_setting('display_teacher_in_courselist') === 'true';
+    $showTeacher = 'true' === api_get_setting('display_teacher_in_courselist');
     $ajax_url = api_get_path(WEB_AJAX_PATH).'course.ajax.php?a=add_course_vote';
     $user_id = api_get_user_id();
     $categoryListFromDatabase = CourseCategory::getCategories();
@@ -145,7 +145,7 @@ if ($showCourses && $action != 'display_sessions') {
     if (!empty($browse_courses_in_category)) {
         echo '<div class="grid-courses row">';
         foreach ($browse_courses_in_category as $course) {
-            $course_hidden = $course['visibility'] == COURSE_VISIBILITY_HIDDEN;
+            $course_hidden = COURSE_VISIBILITY_HIDDEN == $course['visibility'];
 
             if ($course_hidden) {
                 continue;
@@ -155,13 +155,13 @@ if ($showCourses && $action != 'display_sessions') {
             $userRegisteredInCourseAsTeacher = CourseManager::is_course_teacher($user_id, $course['code']);
             $userRegistered = $userRegisteredInCourse && $userRegisteredInCourseAsTeacher;
 
-            $course_public = $course['visibility'] == COURSE_VISIBILITY_OPEN_WORLD;
-            $course_open = $course['visibility'] == COURSE_VISIBILITY_OPEN_PLATFORM;
-            $course_private = $course['visibility'] == COURSE_VISIBILITY_REGISTERED;
-            $course_closed = $course['visibility'] == COURSE_VISIBILITY_CLOSED;
+            $course_public = COURSE_VISIBILITY_OPEN_WORLD == $course['visibility'];
+            $course_open = COURSE_VISIBILITY_OPEN_PLATFORM == $course['visibility'];
+            $course_private = COURSE_VISIBILITY_REGISTERED == $course['visibility'];
+            $course_closed = COURSE_VISIBILITY_CLOSED == $course['visibility'];
 
-            $course_subscribe_allowed = $course['subscribe'] == 1;
-            $course_unsubscribe_allowed = $course['unsubscribe'] == 1;
+            $course_subscribe_allowed = 1 == $course['subscribe'];
+            $course_unsubscribe_allowed = 1 == $course['unsubscribe'];
             $count_connections = $course['count_connections'];
             $creation_date = substr($course['creation_date'], 0, 10);
 
@@ -405,7 +405,7 @@ function return_title($course)
     $html .= '<a title="'.$course['title'].'" href="'.$course['about_url'].'">'.$course['title'].'</a>';
     $html .= '</h4></div>';
 
-    if (api_get_configuration_value('hide_course_rating') === false) {
+    if (false === api_get_configuration_value('hide_course_rating')) {
         $ajax_url = api_get_path(WEB_AJAX_PATH).'course.ajax.php?a=add_course_vote';
         $rating = Display::return_rating_system(
             'star_'.$course['real_id'],
@@ -452,7 +452,7 @@ function return_already_registered_label($in_status)
 {
     $icon = '<em class="fa fa-check"></em>';
     $title = get_lang("YouAreATrainerOfThisCourse");
-    if ($in_status == 'student') {
+    if ('student' == $in_status) {
         $icon = '<em class="fa fa-check"></em>';
         $title = get_lang("Already subscribed");
     }
diff --git a/public/main/auth/courses_controller.php b/public/main/auth/courses_controller.php
index 1996374a12..7dba9d110d 100644
--- a/public/main/auth/courses_controller.php
+++ b/public/main/auth/courses_controller.php
@@ -16,8 +16,6 @@ use Chamilo\CoreBundle\Repository\SequenceRepository;
  * it should be included inside a dispatcher file (e.g: index.php)
  *
  * @author Christian Fasanando <christian1827@gmail.com> - BeezNest
- *
- * @package chamilo.auth
  */
 class CoursesController
 {
@@ -62,7 +60,7 @@ class CoursesController
         $listCategories = CoursesAndSessionsCatalog::getCourseCategoriesTree();
 
         $data['countCoursesInCategory'] = CourseCategory::countCoursesInCategory($category_code);
-        if ($action === 'display_random_courses') {
+        if ('display_random_courses' === $action) {
             // Random value is used instead limit filter
             $data['browse_courses_in_category'] = CoursesAndSessionsCatalog::getCoursesInCategory(null, 12);
             $data['countCoursesInCategory'] = count($data['browse_courses_in_category']);
@@ -85,7 +83,7 @@ class CoursesController
         $user_coursecodes = [];
 
         // we need only the course codes as these will be used to match against the courses of the category
-        if ($user_courses != '') {
+        if ('' != $user_courses) {
             foreach ($user_courses as $key => $value) {
                 $user_coursecodes[] = $value['code'];
             }
@@ -150,7 +148,7 @@ class CoursesController
         $user_coursecodes = [];
 
         // we need only the course codes as these will be used to match against the courses of the category
-        if ($user_courses != '') {
+        if ('' != $user_courses) {
             foreach ($user_courses as $value) {
                 $user_coursecodes[] = $value['code'];
             }
@@ -254,7 +252,7 @@ class CoursesController
         }
 
         $catalogSessionAutoSubscriptionAllowed = false;
-        if (api_get_setting('catalog_allow_session_auto_subscription') === 'true') {
+        if ('true' === api_get_setting('catalog_allow_session_auto_subscription')) {
             $catalogSessionAutoSubscriptionAllowed = true;
         }
 
@@ -357,7 +355,7 @@ class CoursesController
     public function sessionList($action, $nameTools, $limit = [])
     {
         $date = isset($_POST['date']) ? $_POST['date'] : date('Y-m-d');
-        $hiddenLinks = isset($_GET['hidden_links']) ? $_GET['hidden_links'] == 1 : false;
+        $hiddenLinks = isset($_GET['hidden_links']) ? 1 == $_GET['hidden_links'] : false;
         $limit = isset($limit) ? $limit : self::getLimitArray();
 
         $countSessions = CoursesAndSessionsCatalog::browseSessions($date, [], false, true);
@@ -381,7 +379,7 @@ class CoursesController
         $tpl->assign('actions', self::getTabList(2));
         $tpl->assign('show_courses', CoursesAndSessionsCatalog::showCourses());
         $tpl->assign('show_sessions', CoursesAndSessionsCatalog::showSessions());
-        $tpl->assign('show_tutor', api_get_setting('show_session_coach') === 'true');
+        $tpl->assign('show_tutor', 'true' === api_get_setting('show_session_coach'));
         $tpl->assign('course_url', $courseUrl);
         $tpl->assign('catalog_pagination', $pagination);
         $tpl->assign('hidden_links', $hiddenLinks);
@@ -405,7 +403,7 @@ class CoursesController
     public function sessionsListByName(array $limit)
     {
         $keyword = isset($_POST['keyword']) ? $_POST['keyword'] : null;
-        $hiddenLinks = isset($_GET['hidden_links']) ? (int) $_GET['hidden_links'] == 1 : false;
+        $hiddenLinks = isset($_GET['hidden_links']) ? 1 == (int) $_GET['hidden_links'] : false;
         $courseUrl = CourseCategory::getCourseCategoryUrl(
             1,
             $limit['length'],
@@ -421,7 +419,7 @@ class CoursesController
         $tpl->assign('actions', self::getTabList(2));
         $tpl->assign('show_courses', CoursesAndSessionsCatalog::showCourses());
         $tpl->assign('show_sessions', CoursesAndSessionsCatalog::showSessions());
-        $tpl->assign('show_tutor', api_get_setting('show_session_coach') === 'true' ? true : false);
+        $tpl->assign('show_tutor', 'true' === api_get_setting('show_session_coach') ? true : false);
         $tpl->assign('course_url', $courseUrl);
         $tpl->assign('already_subscribed_label', $this->getAlreadyRegisteredInSessionLabel());
         $tpl->assign('hidden_links', $hiddenLinks);
@@ -429,7 +427,7 @@ class CoursesController
         $tpl->assign('keyword', Security::remove_XSS($keyword));
         $tpl->assign('sessions', $sessionsBlocks);
 
-         $layout = $tpl->get_template('auth/session_catalog.html.twig');
+        $layout = $tpl->get_template('auth/session_catalog.html.twig');
         $content = $tpl->fetch($layout);
         $tpl->assign('content', $content);
         $tpl->display_one_col_template();
@@ -447,14 +445,14 @@ class CoursesController
         $url = CourseCategory::getCourseCategoryUrl(1, $pageLength, null, 0, 'display_sessions');
         $headers = [];
         if (CoursesAndSessionsCatalog::showCourses()) {
-            $headers[] =  [
+            $headers[] = [
                 'url' => api_get_self(),
                 'content' => get_lang('CourseManagement'),
             ];
         }
 
         if (CoursesAndSessionsCatalog::showSessions()) {
-            $headers[] =  [
+            $headers[] = [
                 'url' => $url,
                 'content' => get_lang('SessionList'),
             ];
@@ -472,7 +470,7 @@ class CoursesController
     {
         $searchTag = isset($_POST['search_tag']) ? $_POST['search_tag'] : null;
         $searchDate = isset($_POST['date']) ? $_POST['date'] : date('Y-m-d');
-        $hiddenLinks = isset($_GET['hidden_links']) ? (int) $_GET['hidden_links'] == 1 : false;
+        $hiddenLinks = isset($_GET['hidden_links']) ? 1 == (int) $_GET['hidden_links'] : false;
         $courseUrl = CourseCategory::getCourseCategoryUrl(
             1,
             $limit['length'],
@@ -487,7 +485,7 @@ class CoursesController
         $tpl = new Template();
         $tpl->assign('show_courses', CoursesAndSessionsCatalog::showCourses());
         $tpl->assign('show_sessions', CoursesAndSessionsCatalog::showSessions());
-        $tpl->assign('show_tutor', api_get_setting('show_session_coach') === 'true' ? true : false);
+        $tpl->assign('show_tutor', 'true' === api_get_setting('show_session_coach') ? true : false);
         $tpl->assign('course_url', $courseUrl);
         $tpl->assign('already_subscribed_label', $this->getAlreadyRegisteredInSessionLabel());
         $tpl->assign('hidden_links', $hiddenLinks);
@@ -584,7 +582,7 @@ class CoursesController
 
             $hasRequirements = false;
             foreach ($sequences['sequences'] as $sequence) {
-                if (count($sequence['requirements']) === 0) {
+                if (0 === count($sequence['requirements'])) {
                     continue;
                 }
                 $hasRequirements = true;
diff --git a/public/main/auth/inscription.php b/public/main/auth/inscription.php
index e5469b82eb..7243daa80a 100644
--- a/public/main/auth/inscription.php
+++ b/public/main/auth/inscription.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 
 /**
  * This script displays a form for registering new users.
- *
- * @package    chamilo.auth
  */
 
 //quick hack to adapt the registration form result to the selected registration language
@@ -27,7 +25,7 @@ $allowedFields = [
 ];
 
 $allowedFieldsConfiguration = api_get_configuration_value('allow_fields_inscription');
-if ($allowedFieldsConfiguration !== false) {
+if (false !== $allowedFieldsConfiguration) {
     $allowedFields = isset($allowedFieldsConfiguration['fields']) ? $allowedFieldsConfiguration['fields'] : [];
     $allowedFields['extra_fields'] = isset($allowedFieldsConfiguration['extra_fields']) ? $allowedFieldsConfiguration['extra_fields'] : [];
 }
@@ -36,8 +34,8 @@ $extraFieldsLoaded = false;
 $htmlHeadXtra[] = api_get_password_checker_js('#username', '#pass1');
 // User is not allowed if Terms and Conditions are disabled and
 // registration is disabled too.
-$isNotAllowedHere = api_get_setting('allow_terms_conditions') === 'false' &&
-    api_get_setting('allow_registration') === 'false';
+$isNotAllowedHere = 'false' === api_get_setting('allow_terms_conditions') &&
+    'false' === api_get_setting('allow_registration');
 
 if ($isNotAllowedHere) {
     api_not_allowed(true, get_lang('Sorry, you are trying to access the registration page for this portal, but registration is currently disabled. Please contact the administrator (see contact information in the footer). If you already have an account on this site.'));
@@ -59,7 +57,7 @@ if ($extraConditions && isset($extraConditions['conditions'])) {
     $extraConditions = $extraConditions['conditions'];
     foreach ($extraConditions as $condition) {
         $exists = $userExtraField->get_handler_field_info_by_field_variable($condition['variable']);
-        if ($exists == false) {
+        if (false == $exists) {
             $params = [
                 'field_type' => ExtraField::FIELD_TYPE_CHECKBOX,
                 'variable' => $condition['variable'],
@@ -77,7 +75,7 @@ if ($extraConditions && isset($extraConditions['conditions'])) {
 
 $form = new FormValidator('registration');
 $user_already_registered_show_terms = false;
-if (api_get_setting('allow_terms_conditions') === 'true') {
+if ('true' === api_get_setting('allow_terms_conditions')) {
     $user_already_registered_show_terms = isset($_SESSION['term_and_condition']['user_id']);
 }
 
@@ -104,11 +102,11 @@ if (!empty($course_code_redirect)) {
     Session::write('exercise_redirect', $exercise_redirect);
 }
 
-if ($user_already_registered_show_terms === false &&
-    api_get_setting('allow_registration') !== 'false'
+if (false === $user_already_registered_show_terms &&
+    'false' !== api_get_setting('allow_registration')
 ) {
     // STUDENT/TEACHER
-    if (api_get_setting('allow_registration_as_teacher') != 'false') {
+    if ('false' != api_get_setting('allow_registration_as_teacher')) {
         if (in_array('status', $allowedFields)) {
             $form->addRadio(
                 'status',
@@ -138,13 +136,13 @@ if ($user_already_registered_show_terms === false &&
 
     // EMAIL
     $form->addElement('text', 'email', get_lang('e-mail'), ['size' => 40]);
-    if (api_get_setting('registration', 'email') === 'true') {
+    if ('true' === api_get_setting('registration', 'email')) {
         $form->addRule('email', get_lang('Required field'), 'required');
     }
 
-    if (api_get_setting('login_is_email') === 'true') {
+    if ('true' === api_get_setting('login_is_email')) {
         $form->applyFilter('email', 'trim');
-        if (api_get_setting('registration', 'email') != 'true') {
+        if ('true' != api_get_setting('registration', 'email')) {
             $form->addRule('email', get_lang('Required field'), 'required');
         }
         $form->addRule(
@@ -162,7 +160,7 @@ if ($user_already_registered_show_terms === false &&
     $form->addRule('email', get_lang('e-mailWrong'), 'email');
 
     // USERNAME
-    if (api_get_setting('login_is_email') != 'true') {
+    if ('true' != api_get_setting('login_is_email')) {
         $form->addText(
             'username',
             get_lang('Username'),
@@ -215,7 +213,7 @@ if ($user_already_registered_show_terms === false &&
             get_lang('Phone'),
             ['size' => 20]
         );
-        if (api_get_setting('registration', 'phone') == 'true') {
+        if ('true' == api_get_setting('registration', 'phone')) {
             $form->addRule(
                 'phone',
                 get_lang('Required field'),
@@ -226,7 +224,7 @@ if ($user_already_registered_show_terms === false &&
 
     // Language
     if (in_array('language', $allowedFields)) {
-        if (api_get_setting('registration', 'language') == 'true') {
+        if ('true' == api_get_setting('registration', 'language')) {
             $form->addSelectLanguage(
                 'language',
                 get_lang('Language')
@@ -241,7 +239,7 @@ if ($user_already_registered_show_terms === false &&
             get_lang('Code'),
             ['size' => 40]
         );
-        if (api_get_setting('registration', 'officialcode') == 'true') {
+        if ('true' == api_get_setting('registration', 'officialcode')) {
             $form->addRule(
                 'official_code',
                 get_lang('Required field'),
@@ -251,8 +249,8 @@ if ($user_already_registered_show_terms === false &&
     }
 
     // EXTENDED FIELDS
-    if (api_get_setting('extended_profile') == 'true' &&
-        api_get_setting('extendedprofile_registration', 'mycomptetences') == 'true'
+    if ('true' == api_get_setting('extended_profile') &&
+        'true' == api_get_setting('extendedprofile_registration', 'mycomptetences')
     ) {
         $form->addHtmlEditor(
             'competences',
@@ -263,8 +261,8 @@ if ($user_already_registered_show_terms === false &&
         );
     }
 
-    if (api_get_setting('extended_profile') == 'true' &&
-        api_get_setting('extendedprofile_registration', 'mydiplomas') == 'true'
+    if ('true' == api_get_setting('extended_profile') &&
+        'true' == api_get_setting('extendedprofile_registration', 'mydiplomas')
     ) {
         $form->addHtmlEditor(
             'diplomas',
@@ -275,8 +273,8 @@ if ($user_already_registered_show_terms === false &&
         );
     }
 
-    if (api_get_setting('extended_profile') == 'true' &&
-        api_get_setting('extendedprofile_registration', 'myteach') == 'true'
+    if ('true' == api_get_setting('extended_profile') &&
+        'true' == api_get_setting('extendedprofile_registration', 'myteach')
     ) {
         $form->addHtmlEditor(
             'teach',
@@ -287,8 +285,8 @@ if ($user_already_registered_show_terms === false &&
         );
     }
 
-    if (api_get_setting('extended_profile') == 'true' &&
-        api_get_setting('extendedprofile_registration', 'mypersonalopenarea') == 'true'
+    if ('true' == api_get_setting('extended_profile') &&
+        'true' == api_get_setting('extendedprofile_registration', 'mypersonalopenarea')
     ) {
         $form->addHtmlEditor(
             'openarea',
@@ -299,24 +297,24 @@ if ($user_already_registered_show_terms === false &&
         );
     }
 
-    if (api_get_setting('extended_profile') === 'true') {
-        if (api_get_setting('extendedprofile_registration', 'mycomptetences') === 'true' &&
-            api_get_setting('extendedprofile_registrationrequired', 'mycomptetences') === 'true'
+    if ('true' === api_get_setting('extended_profile')) {
+        if ('true' === api_get_setting('extendedprofile_registration', 'mycomptetences') &&
+            'true' === api_get_setting('extendedprofile_registrationrequired', 'mycomptetences')
         ) {
             $form->addRule('competences', get_lang('Required field'), 'required');
         }
-        if (api_get_setting('extendedprofile_registration', 'mydiplomas') === 'true' &&
-            api_get_setting('extendedprofile_registrationrequired', 'mydiplomas') === 'true'
+        if ('true' === api_get_setting('extendedprofile_registration', 'mydiplomas') &&
+            'true' === api_get_setting('extendedprofile_registrationrequired', 'mydiplomas')
         ) {
             $form->addRule('diplomas', get_lang('Required field'), 'required');
         }
-        if (api_get_setting('extendedprofile_registration', 'myteach') === 'true' &&
-            api_get_setting('extendedprofile_registrationrequired', 'myteach') === 'true'
+        if ('true' === api_get_setting('extendedprofile_registration', 'myteach') &&
+            'true' === api_get_setting('extendedprofile_registrationrequired', 'myteach')
         ) {
             $form->addRule('teach', get_lang('Required field'), 'required');
         }
-        if (api_get_setting('extendedprofile_registration', 'mypersonalopenarea') === 'true' &&
-            api_get_setting('extendedprofile_registrationrequired', 'mypersonalopenarea') === 'true'
+        if ('true' === api_get_setting('extendedprofile_registration', 'mypersonalopenarea') &&
+            'true' === api_get_setting('extendedprofile_registrationrequired', 'mypersonalopenarea')
         ) {
             $form->addRule('openarea', get_lang('Required field'), 'required');
         }
@@ -359,7 +357,7 @@ if ($user_already_registered_show_terms === false &&
 
     // CAPTCHA
     $captcha = api_get_setting('allow_captcha');
-    $allowCaptcha = $captcha === 'true';
+    $allowCaptcha = 'true' === $captcha;
 
     if ($allowCaptcha) {
         $ajax = api_get_path(WEB_AJAX_PATH).'form.ajax.php?a=get_captcha';
@@ -406,7 +404,7 @@ if ($user_already_registered_show_terms === false &&
     }
 }
 
-if (isset($_SESSION['user_language_choice']) && $_SESSION['user_language_choice'] != '') {
+if (isset($_SESSION['user_language_choice']) && '' != $_SESSION['user_language_choice']) {
     $defaults['language'] = $_SESSION['user_language_choice'];
 } else {
     $defaults['language'] = api_get_setting('platformLanguage');
@@ -435,10 +433,10 @@ $tool_name = get_lang('Registration');
 
 if (!CustomPages::enabled()) {
     // Load terms & conditions from the current lang
-    if (api_get_setting('allow_terms_conditions') === 'true') {
+    if ('true' === api_get_setting('allow_terms_conditions')) {
         $get = array_keys($_GET);
         if (isset($get)) {
-            if (isset($get[0]) && $get[0] == 'legal') {
+            if (isset($get[0]) && 'legal' == $get[0]) {
                 $language = api_get_interface_language();
                 $language = api_get_language_id($language);
                 $term_preview = LegalManager::get_last_condition($language);
@@ -466,7 +464,7 @@ if (!CustomPages::enabled()) {
         }
     }
 
-    if (api_get_setting('allow_terms_conditions') === 'true' && $user_already_registered_show_terms) {
+    if ('true' === api_get_setting('allow_terms_conditions') && $user_already_registered_show_terms) {
         $tool_name = get_lang('Terms and Conditions');
     }
 }
@@ -476,18 +474,18 @@ if ($isNotAllowedHere) {
     api_not_allowed(true, get_lang('Sorry, you are trying to access the registration page for this portal, but registration is currently disabled. Please contact the administrator (see contact information in the footer). If you already have an account on this site.'));
 }
 
-if (api_get_setting('allow_registration') === 'approval') {
+if ('approval' === api_get_setting('allow_registration')) {
     $content .= Display::return_message(get_lang('Your account has to be approved'));
 }
 
 $showTerms = false;
 // Terms and conditions
-if (api_get_setting('allow_terms_conditions') === 'true' && $user_already_registered_show_terms) {
+if ('true' === api_get_setting('allow_terms_conditions') && $user_already_registered_show_terms) {
     if (!api_is_platform_admin()) {
-        if (api_get_setting('show_terms_if_profile_completed') === 'true') {
+        if ('true' === api_get_setting('show_terms_if_profile_completed')) {
             $userInfo = api_get_user_info();
-            if ($userInfo && $userInfo['status'] != ANONYMOUS) {
-                if ((int) $userInfo['profile_completed'] !== 1) {
+            if ($userInfo && ANONYMOUS != $userInfo['status']) {
+                if (1 !== (int) $userInfo['profile_completed']) {
                     api_not_allowed(true);
                 }
             }
@@ -517,7 +515,7 @@ if (api_get_setting('allow_terms_conditions') === 'true' && $user_already_regist
     $form->addHidden('legal_info', $term_preview['id'].':'.$term_preview['language_id']);
 
     // Show if only HTML type
-    if ($term_preview['type'] == '2') {
+    if ('2' == $term_preview['type']) {
         $termExtraFields = new ExtraFieldValue('terms_and_condition');
         $values = $termExtraFields->getAllValuesByItem($term_preview['id']);
         foreach ($values as $value) {
@@ -527,7 +525,7 @@ if (api_get_setting('allow_terms_conditions') === 'true' && $user_already_regist
         }
     }
 
-    if ($term_preview['type'] == 1) {
+    if (1 == $term_preview['type']) {
         $form->addElement(
             'checkbox',
             'legal_accept',
@@ -547,7 +545,7 @@ if (api_get_setting('allow_terms_conditions') === 'true' && $user_already_regist
 $allowDoubleValidation = api_get_configuration_value('allow_double_validation_in_registration');
 
 $formContainsSendButton = false;
-if ($allowDoubleValidation && $showTerms == false) {
+if ($allowDoubleValidation && false == $showTerms) {
     $htmlHeadXtra[] = '<script>
         $(function() {
             $("#pre_validation").click(function() {
@@ -578,9 +576,9 @@ if ($allowDoubleValidation && $showTerms == false) {
     // registration is allowed in any way or if the user is already registered
     // but needs to confirm terms. If not, send not allowed message
     if (
-        api_get_setting('allow_registration') === 'approval' ||
-        api_get_setting('allow_registration') === 'true' ||
-        api_get_setting('allow_registration') === 'confirmation' ||
+        'approval' === api_get_setting('allow_registration') ||
+        'true' === api_get_setting('allow_registration') ||
+        'confirmation' === api_get_setting('allow_registration') ||
         $user_already_registered_show_terms ||
         $showTerms
     ) {
@@ -630,7 +628,7 @@ if ($form->validate()) {
         $values['username'] = api_substr($values['username'], 0, USERNAME_MAX_LENGTH);
     }
 
-    if (api_get_setting('allow_registration_as_teacher') === 'false') {
+    if ('false' === api_get_setting('allow_registration_as_teacher')) {
         $values['status'] = STUDENT;
     }
 
@@ -638,12 +636,12 @@ if ($form->validate()) {
         $values['official_code'] = api_strtoupper($values['username']);
     }
 
-    if (api_get_setting('login_is_email') === 'true') {
+    if ('true' === api_get_setting('login_is_email')) {
         $values['username'] = $values['email'];
     }
 
     if ($user_already_registered_show_terms &&
-        api_get_setting('allow_terms_conditions') === 'true'
+        'true' === api_get_setting('allow_terms_conditions')
     ) {
         $user_id = $_SESSION['term_and_condition']['user_id'];
         $is_admin = UserManager::is_admin($user_id);
@@ -653,10 +651,10 @@ if ($form->validate()) {
         // Register extra fields
         $extras = [];
         foreach ($values as $key => $value) {
-            if (substr($key, 0, 6) == 'extra_') {
+            if ('extra_' == substr($key, 0, 6)) {
                 //an extra field
                 $extras[substr($key, 6)] = $value;
-            } elseif (strpos($key, 'remove_extra_') !== false) {
+            } elseif (false !== strpos($key, 'remove_extra_')) {
                 $extra_value = Security::filter_filename(urldecode(key($value)));
                 // To remove from user_field_value and folder
                 UserManager::update_extra_field_value(
@@ -726,29 +724,29 @@ if ($form->validate()) {
             $store_extended = false;
             $sql = "UPDATE ".Database::get_main_table(TABLE_MAIN_USER)." SET ";
 
-            if (api_get_setting('extended_profile') == 'true' &&
-                api_get_setting('extendedprofile_registration', 'mycomptetences') == 'true'
+            if ('true' == api_get_setting('extended_profile') &&
+                'true' == api_get_setting('extendedprofile_registration', 'mycomptetences')
             ) {
                 $sql_set[] = "competences = '".Database::escape_string($values['competences'])."'";
                 $store_extended = true;
             }
 
-            if (api_get_setting('extended_profile') == 'true' &&
-                api_get_setting('extendedprofile_registration', 'mydiplomas') == 'true'
+            if ('true' == api_get_setting('extended_profile') &&
+                'true' == api_get_setting('extendedprofile_registration', 'mydiplomas')
             ) {
                 $sql_set[] = "diplomas = '".Database::escape_string($values['diplomas'])."'";
                 $store_extended = true;
             }
 
-            if (api_get_setting('extended_profile') == 'true' &&
-                api_get_setting('extendedprofile_registration', 'myteach') == 'true'
+            if ('true' == api_get_setting('extended_profile') &&
+                'true' == api_get_setting('extendedprofile_registration', 'myteach')
             ) {
                 $sql_set[] = "teach = '".Database::escape_string($values['teach'])."'";
                 $store_extended = true;
             }
 
-            if (api_get_setting('extended_profile') == 'true' &&
-                api_get_setting('extendedprofile_registration', 'mypersonalopenarea') == 'true'
+            if ('true' == api_get_setting('extended_profile') &&
+                'true' == api_get_setting('extendedprofile_registration', 'mypersonalopenarea')
             ) {
                 $sql_set[] = "openarea = '".Database::escape_string($values['openarea'])."'";
                 $store_extended = true;
@@ -795,7 +793,7 @@ if ($form->validate()) {
 
             /* If the account has to be approved then we set the account to inactive,
             sent a mail to the platform admin and exit the page.*/
-            if (api_get_setting('allow_registration') === 'approval') {
+            if ('approval' === api_get_setting('allow_registration')) {
                 // 1. Send mail to all platform admin
                 $emailsubject = get_lang('Approval for new account').': '.$values['username'];
                 $emailbody = get_lang('Approval for new account')."\n";
@@ -853,7 +851,7 @@ if ($form->validate()) {
                 echo $content;
                 Display::display_footer();
                 exit;
-            } elseif (api_get_setting('allow_registration') === 'confirmation') {
+            } elseif ('confirmation' === api_get_setting('allow_registration')) {
                 // 1. Send mail to the user
                 $thisUser = api_get_user_entity($user_id);
                 UserManager::sendUserConfirmationMail($thisUser);
@@ -880,7 +878,7 @@ if ($form->validate()) {
     }
 
     // Terms & Conditions
-    if (api_get_setting('allow_terms_conditions') === 'true') {
+    if ('true' === api_get_setting('allow_terms_conditions')) {
         // Update the terms & conditions.
         if (isset($values['legal_accept_type'])) {
             $cond_array = explode(':', $values['legal_accept_type']);
@@ -937,7 +935,7 @@ if ($form->validate()) {
     $_user['user_id'] = $user_id;
     Session::write('_user', $_user);
 
-    $is_allowedCreateCourse = isset($values['status']) && $values['status'] == 1;
+    $is_allowedCreateCourse = isset($values['status']) && 1 == $values['status'];
     $usersCanCreateCourse = api_is_allowed_to_create_course();
 
     Session::write('is_allowedCreateCourse', $is_allowedCreateCourse);
@@ -966,8 +964,8 @@ if ($form->validate()) {
         'go_button' => '',
     ];
 
-    if (api_get_setting('allow_terms_conditions') === 'true' && $user_already_registered_show_terms) {
-        if (api_get_setting('load_term_conditions_section') === 'login') {
+    if ('true' === api_get_setting('allow_terms_conditions') && $user_already_registered_show_terms) {
+        if ('login' === api_get_setting('load_term_conditions_section')) {
             $form_data['action'] = api_get_path(WEB_PATH).'user_portal.php';
         } else {
             $courseInfo = api_get_course_info();
@@ -991,7 +989,7 @@ if ($form->validate()) {
             }
             $form_data['action'] = api_get_path(WEB_CODE_PATH).'create_course/add_course.php';
 
-            if (api_get_setting('course_validation') === 'true') {
+            if ('true' === api_get_setting('course_validation')) {
                 $form_data['button'] = Display::button(
                     'next',
                     get_lang('Create a course request'),
@@ -1010,7 +1008,7 @@ if ($form->validate()) {
                     ).'</a>';
             }
         } else {
-            if (api_get_setting('allow_students_to_browse_courses') == 'true') {
+            if ('true' == api_get_setting('allow_students_to_browse_courses')) {
                 $form_data['action'] = 'courses.php?action=subscribe';
                 $form_data['message'] = '<p>'.get_lang('You can now select, in the list, the course you want access to').".</p>";
             } else {
diff --git a/public/main/auth/justification.php b/public/main/auth/justification.php
index d09304baa7..1c91aea075 100644
--- a/public/main/auth/justification.php
+++ b/public/main/auth/justification.php
@@ -6,7 +6,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users(true);
 
-$allowJustification = api_get_plugin_setting('justification', 'tool_enable') === 'true';
+$allowJustification = 'true' === api_get_plugin_setting('justification', 'tool_enable');
 
 if (!$allowJustification) {
     api_not_allowed(true);
@@ -79,7 +79,7 @@ switch ($action) {
         $justificationId = isset($_REQUEST['justification_id']) ? (int) $_REQUEST['justification_id'] : '';
         $userJustification = $plugin->getUserJustification($justificationId);
         $justification = $plugin->getJustification($userJustification['justification_document_id']);
-        if ($justification['date_manual_on'] == 0) {
+        if (0 == $justification['date_manual_on']) {
             api_not_allowed(true);
         }
         $formEdit = new FormValidator('edit', 'post', api_get_self().'?a=edit_justification&justification_id='.$justificationId);
@@ -146,7 +146,7 @@ if (!empty($userJustifications)) {
         $table->setCellContents($row, $col++, $date);
         $actions = '';
 
-        if ($justification['date_manual_on'] == 1) {
+        if (1 == $justification['date_manual_on']) {
             $actions .= Display::url(get_lang('Edit'), api_get_self().'?a=edit_justification&justification_id='.$userJustification['id'], ['class' => 'btn btn-primary']);
         }
         $actions .= '&nbsp;'.Display::url(get_lang('Delete'), api_get_self().'?a=delete_justification&justification_id='.$userJustification['id'], ['class' => 'btn btn-danger']);
@@ -170,10 +170,8 @@ $headers = [
 ];
 $justificationTab = Display::tabsOnlyLink($headers, 2);
 
-
 $justification = $justificationTab.$formValidator->returnForm().$userJustificationList;
 
-
 $tpl = new Template(get_lang('ModifyProfile'));
 
 SocialManager::setSocialUserBlock($tpl, api_get_user_id(), 'home');
diff --git a/public/main/auth/layout.php b/public/main/auth/layout.php
index 4cee822aa8..04e1deeb8a 100644
--- a/public/main/auth/layout.php
+++ b/public/main/auth/layout.php
@@ -5,8 +5,6 @@
  * Layout (principal view) used for structuring other views.
  *
  * @author Christian Fasanando <christian1827@gmail.com> - Beeznest
- *
- * @package chamilo.auth
  */
 
 // Header
diff --git a/public/main/auth/lostPassword.php b/public/main/auth/lostPassword.php
index e548b6dfa6..77bbe17d2e 100644
--- a/public/main/auth/lostPassword.php
+++ b/public/main/auth/lostPassword.php
@@ -12,8 +12,6 @@
  * to generate a new one.
  *
  * @todo refactor, move relevant functions to code libraries
- *
- * @package chamilo.auth
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -22,7 +20,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 // already be some display output.
 
 // Forbidden to retrieve the lost password
-if (api_get_setting('allow_lostpassword') == 'false') {
+if ('false' == api_get_setting('allow_lostpassword')) {
     api_not_allowed(true);
 }
 
@@ -63,7 +61,7 @@ $form->addText(
 );
 
 $captcha = api_get_setting('allow_captcha');
-$allowCaptcha = $captcha === 'true';
+$allowCaptcha = 'true' === $captcha;
 
 if ($allowCaptcha) {
     $ajax = api_get_path(WEB_AJAX_PATH).'form.ajax.php?a=get_captcha';
@@ -120,7 +118,7 @@ if ($form->validate()) {
 
     $passwordEncryption = api_get_configuration_value('password_encryption');
 
-    if ($passwordEncryption === 'none') {
+    if ('none' === $passwordEncryption) {
         $messageText = Login::send_password_to_user($user, true);
 
         if (CustomPages::enabled() && CustomPages::exists(CustomPages::INDEX_UNLOGGED)) {
@@ -138,7 +136,7 @@ if ($form->validate()) {
         exit;
     }
 
-    if ($user['auth_source'] == 'extldap') {
+    if ('extldap' == $user['auth_source']) {
         Display::addFlash(
             Display::return_message(get_lang('Could not reset password, contact your helpdesk.'), 'info', false)
         );
@@ -148,7 +146,7 @@ if ($form->validate()) {
 
     $userResetPasswordSetting = api_get_setting('user_reset_password');
 
-    if ($userResetPasswordSetting === 'true') {
+    if ('true' === $userResetPasswordSetting) {
         $userObj = api_get_user_entity($user['uid']);
         Login::sendResetEmail($userObj);
 
diff --git a/public/main/auth/my_progress.php b/public/main/auth/my_progress.php
index bb528f0ee1..a14e7a6486 100644
--- a/public/main/auth/my_progress.php
+++ b/public/main/auth/my_progress.php
@@ -3,8 +3,6 @@
 
 /**
  * Reporting page on the user's own progress.
- *
- * @package chamilo.tracking
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -28,7 +26,7 @@ $(function() {
 });
 </script>";
 
-$pluginCalendar = api_get_plugin_setting('learning_calendar', 'enabled') === 'true';
+$pluginCalendar = 'true' === api_get_plugin_setting('learning_calendar', 'enabled');
 
 if ($pluginCalendar) {
     $plugin = LearningCalendarPlugin::create();
@@ -55,7 +53,7 @@ if (!empty($courseUserList)) {
         $courseId = $result['c_id'];
         $courseInfo = api_get_course_info_by_id($courseId);
 
-        if ($count == 1) {
+        if (1 == $count) {
             $first = '<a href="#'.$login.'">'.get_lang('First').'</a>';
         }
         if ($count == $last_item) {
@@ -99,9 +97,9 @@ if (!empty($dates)) {
     $content .= '</div></div>';
 }
 
-if (api_get_configuration_value('private_messages_about_user_visible_to_user') === true) {
+if (true === api_get_configuration_value('private_messages_about_user_visible_to_user')) {
     $allowMessages = api_get_configuration_value('private_messages_about_user');
-    if ($allowMessages === true) {
+    if (true === $allowMessages) {
         // Messages
         $content .= Display::page_subheader2(get_lang('Messages'));
         $content .= MessageManager::getMessagesAboutUserToString(api_get_user_info());
diff --git a/public/main/auth/profile.php b/public/main/auth/profile.php
index fdf5906a2a..d7399ecc1f 100644
--- a/public/main/auth/profile.php
+++ b/public/main/auth/profile.php
@@ -16,7 +16,7 @@ $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
 $this_section = SECTION_MYPROFILE;
-$allowSocialTool = api_get_setting('allow_social_tool') == 'true';
+$allowSocialTool = 'true' == api_get_setting('allow_social_tool');
 if ($allowSocialTool) {
     $this_section = SECTION_SOCIAL;
 }
@@ -74,7 +74,7 @@ function show_image(image,width,height) {
 </script>';
 
 $jquery_ready_content = '';
-if (api_get_setting('allow_message_tool') === 'true') {
+if ('true' === api_get_setting('allow_message_tool')) {
     $jquery_ready_content = <<<EOF
     $(".message-content .message-delete").click(function(){
         $(this).parents(".message-content").animate({ opacity: "hide" }, "slow");
@@ -83,7 +83,7 @@ if (api_get_setting('allow_message_tool') === 'true') {
 EOF;
 }
 
-$tool_name = api_get_setting('profile.is_editable') === 'true' ? get_lang('Edit Profile') : get_lang('View my e-portfolio');
+$tool_name = 'true' === api_get_setting('profile.is_editable') ? get_lang('Edit Profile') : get_lang('View my e-portfolio');
 $table_user = Database::get_main_table(TABLE_MAIN_USER);
 
 /*
@@ -103,8 +103,8 @@ $id_temp_key = UserManager::get_api_key_id(api_get_user_id(), 'dokeos');
 $value_array = $array_list_key[$id_temp_key];
 $user_data['api_key_generate'] = $value_array;
 
-if ($user_data !== false) {
-    if (api_get_setting('login_is_email') == 'true') {
+if (false !== $user_data) {
+    if ('true' == api_get_setting('login_is_email')) {
         $user_data['username'] = $user_data['email'];
     }
     if (is_null($user_data['language'])) {
@@ -146,7 +146,7 @@ $form->addElement(
         'size' => USERNAME_MAX_LENGTH,
     ]
 );
-if (!in_array('login', $profileList) || api_get_setting('login_is_email') == 'true') {
+if (!in_array('login', $profileList) || 'true' == api_get_setting('login_is_email')) {
     $form->freeze('username');
 }
 $form->applyFilter('username', 'stripslashes');
@@ -162,7 +162,7 @@ if (!in_array('officialcode', $profileList)) {
 $form->applyFilter('official_code', 'stripslashes');
 $form->applyFilter('official_code', 'trim');
 $form->applyFilter('official_code', 'html_filter');
-if (api_get_setting('registration', 'officialcode') === 'true' &&
+if ('true' === api_get_setting('registration', 'officialcode') &&
     in_array('officialcode', $profileList)
 ) {
     $form->addRule('official_code', get_lang('Required field'), 'required');
@@ -174,7 +174,7 @@ if (!in_array('email', $profileList)) {
     $form->freeze('email');
 }
 
-if (api_get_setting('registration', 'email') == 'true' && in_array('email', $profileList)
+if ('true' == api_get_setting('registration', 'email') && in_array('email', $profileList)
 ) {
     $form->applyFilter('email', 'stripslashes');
     $form->applyFilter('email', 'trim');
@@ -192,11 +192,11 @@ $form->applyFilter('phone', 'trim');
 $form->applyFilter('phone', 'html_filter');
 
 //  PICTURE
-if (api_get_setting('profile.is_editable') === 'true' && in_array('picture', $profileList)) {
+if ('true' === api_get_setting('profile.is_editable') && in_array('picture', $profileList)) {
     $form->addFile(
         'picture',
         [
-            $user_data['picture_uri'] != '' ? get_lang('Update Image') : get_lang('Add image'),
+            '' != $user_data['picture_uri'] ? get_lang('Update Image') : get_lang('Add image'),
             get_lang('Only PNG, JPG or GIF images allowed'),
         ],
         [
@@ -228,7 +228,7 @@ if (!in_array('language', $profileList)) {
 }
 
 // THEME
-if (api_get_setting('profile.is_editable') === 'true' && api_get_setting('user_selected_theme') === 'true') {
+if ('true' === api_get_setting('profile.is_editable') && 'true' === api_get_setting('user_selected_theme')) {
     $form->addElement('SelectTheme', 'theme', get_lang('Graphical theme'));
     if (!in_array('theme', $profileList)) {
         $form->freeze('theme');
@@ -237,7 +237,7 @@ if (api_get_setting('profile.is_editable') === 'true' && api_get_setting('user_s
 }
 
 //    EXTENDED PROFILE  this make the page very slow!
-if (api_get_setting('extended_profile') === 'true') {
+if ('true' === api_get_setting('extended_profile')) {
     $width_extended_profile = 500;
     //    MY COMPETENCES
     $form->addHtmlEditor(
@@ -299,8 +299,8 @@ if (api_get_setting('extended_profile') === 'true') {
 }
 
 //    PASSWORD, if auth_source is platform
-if ($user_data['auth_source'] == PLATFORM_AUTH_SOURCE &&
-    api_get_setting('profile.is_editable') === 'true' &&
+if (PLATFORM_AUTH_SOURCE == $user_data['auth_source'] &&
+    'true' === api_get_setting('profile.is_editable') &&
     in_array('password', $profileList)
 ) {
     $form->addElement('password', 'password0', [get_lang('Pass'), get_lang('Enter2passToChange')], ['size' => 40]);
@@ -348,7 +348,7 @@ if (in_array('apikeys', $profileList)) {
     );
 }
 //    SUBMIT
-if (api_get_setting('profile.is_editable') === 'true') {
+if ('true' === api_get_setting('profile.is_editable')) {
     $form->addButtonUpdate(get_lang('Save settings'), 'apply_change');
 } else {
     $form->freeze();
@@ -414,8 +414,8 @@ if ($form->validate()) {
     }
 
     $allow_users_to_change_email_with_no_password = true;
-    if (isset($user_data['auth_source']) && $user_data['auth_source'] == PLATFORM_AUTH_SOURCE &&
-        api_get_setting('allow_users_to_change_email_with_no_password') === 'false'
+    if (isset($user_data['auth_source']) && PLATFORM_AUTH_SOURCE == $user_data['auth_source'] &&
+        'false' === api_get_setting('allow_users_to_change_email_with_no_password')
     ) {
         $allow_users_to_change_email_with_no_password = false;
     }
@@ -573,9 +573,9 @@ if ($form->validate()) {
     unset($user_data['api_key_generate']);
 
     foreach ($user_data as $key => $value) {
-        if (substr($key, 0, 6) === 'extra_') { //an extra field
+        if ('extra_' === substr($key, 0, 6)) { //an extra field
             continue;
-        } elseif (strpos($key, 'remove_extra_') !== false) {
+        } elseif (false !== strpos($key, 'remove_extra_')) {
         } else {
             if (in_array($key, $available_values_to_modify)) {
                 $sql .= " $key = '".Database::escape_string($value)."',";
@@ -624,7 +624,7 @@ if ($form->validate()) {
         Session::write('_locale_user', $user_data['language']);
     }
 
-    if ($passwordWasChecked == false) {
+    if (false == $passwordWasChecked) {
         Display::addFlash(
             Display:: return_message(get_lang('Your new profile has been saved'), 'normal', false)
         );
@@ -666,8 +666,8 @@ if ($form->validate()) {
 
 $actions = '';
 if ($allowSocialTool) {
-    if (api_get_setting('extended_profile') === 'true') {
-        if (api_get_setting('allow_message_tool') === 'true') {
+    if ('true' === api_get_setting('extended_profile')) {
+        if ('true' === api_get_setting('allow_message_tool')) {
             $actions .= '<a href="'.api_get_path(WEB_PATH).'main/social/profile.php">'.
                 Display::return_icon('shared_profile.png', get_lang('View shared profile')).'</a>';
             $actions .= '<a href="'.api_get_path(WEB_PATH).'main/messages/inbox.php">'.
@@ -675,7 +675,7 @@ if ($allowSocialTool) {
         }
         $show = isset($_GET['show']) ? '&amp;show='.Security::remove_XSS($_GET['show']) : '';
 
-        if (isset($_GET['type']) && $_GET['type'] === 'extended') {
+        if (isset($_GET['type']) && 'extended' === $_GET['type']) {
             $actions .= '<a href="profile.php?type=reduced'.$show.'">'.
                 Display::return_icon('edit.png', get_lang('Edit normal profile'), '', 16).'</a>';
         } else {
@@ -685,7 +685,7 @@ if ($allowSocialTool) {
     }
 }
 
-$show_delete_account_button = api_get_setting('platform_unsubscribe_allowed') === 'true' ? true : false;
+$show_delete_account_button = 'true' === api_get_setting('platform_unsubscribe_allowed') ? true : false;
 
 $tpl = new Template(get_lang('Profile'));
 
@@ -698,7 +698,7 @@ if ($actions) {
 
 SocialManager::setSocialUserBlock($tpl, api_get_user_id(), 'messages');
 
-$allowJustification = api_get_plugin_setting('justification', 'tool_enable') === 'true';
+$allowJustification = 'true' === api_get_plugin_setting('justification', 'tool_enable');
 $justification = '';
 if ($allowJustification) {
     $plugin = Justification::create();
diff --git a/public/main/auth/sort_my_courses.php b/public/main/auth/sort_my_courses.php
index 0c20f916e1..a7aab9f71e 100644
--- a/public/main/auth/sort_my_courses.php
+++ b/public/main/auth/sort_my_courses.php
@@ -194,7 +194,7 @@ switch ($action) {
         Database::query($sql);
         Display::addFlash(Display::return_message(get_lang('Update successful')));
 
-        if ($redirect === 'home') {
+        if ('home' === $redirect) {
             $url = api_get_path(WEB_PATH).'user_portal.php';
             header('Location: '.$url);
             exit;
@@ -211,7 +211,7 @@ Display::display_header();
 $stok = Security::get_token();
 $courses_without_category = isset($courses_in_category[0]) ? $courses_in_category[0] : null;
 echo '<div id="actions" class="actions">';
-if ($action != 'createcoursecategory') {
+if ('createcoursecategory' != $action) {
     echo '<a class="ajax" href="'.$currentUrl.'?action=createcoursecategory">';
     echo Display::return_icon('new_folder.png', get_lang('Create a personal courses category'), '', '32');
     echo '</a>';
@@ -234,7 +234,7 @@ if (!empty($user_course_categories)) {
         echo '<a name="category'.$row['id'].'"></a>';
         $url = $currentUrl.'?categoryid='.$row['id'].'&sec_token='.$stok;
         if ($allowCollapsable) {
-            if (isset($row['collapsed']) && $row['collapsed'] == 0) {
+            if (isset($row['collapsed']) && 0 == $row['collapsed']) {
                 echo Display::url(
                     '<i class="fa fa-folder-open"></i>',
                     $url.'&action=set_collapsable&option=1'
@@ -306,13 +306,13 @@ if (!empty($user_course_categories)) {
                 echo CourseManager::getTeacherListFromCourseCodeToString($course['code']);
                 echo '<br />';
 
-                if (api_get_setting('display_teacher_in_courselist') === 'true') {
+                if ('true' === api_get_setting('display_teacher_in_courselist')) {
                     echo $course['tutor'];
                 }
                 echo '</td><td valign="top">'; ?>
                 <div style="float:left;width:110px;">
                 <?php
-                    if (api_get_setting('show_courses_descriptions_in_catalog') == 'true') {
+                    if ('true' == api_get_setting('show_courses_descriptions_in_catalog')) {
                         $icon_title = get_lang('Course description').' - '.$course['title']; ?>
                 <a href="<?php echo api_get_path(WEB_CODE_PATH); ?>inc/ajax/course_home.ajax.php?a=show_course_information&code=<?php echo $course['code']; ?>" data-title="<?php echo $icon_title; ?>" title="<?php echo $icon_title; ?>" class="ajax">
                     <?php
@@ -347,8 +347,8 @@ if (!empty($user_course_categories)) {
               </div>
               <div style="float:left; margin-right:10px;">
                 <?php
-                    if ($course['status'] != 1) {
-                        if ($course['unsubscr'] == 1) {
+                    if (1 != $course['status']) {
+                        if (1 == $course['unsubscr']) {
                             ?>
 
                 <form action="<?php echo api_get_self(); ?>" method="post" onsubmit="javascript: if (!confirm('<?php echo addslashes(api_htmlentities(get_lang("Are you sure you want to unsubscribe?"), ENT_QUOTES, api_get_system_encoding())); ?>')) return false">
@@ -386,13 +386,13 @@ if (!empty($courses_without_category)) {
         echo CourseManager::getTeacherListFromCourseCodeToString($course['code']);
         echo '<br />';
 
-        if (api_get_setting('display_teacher_in_courselist') === 'true') {
+        if ('true' === api_get_setting('display_teacher_in_courselist')) {
             echo $course['tutor'];
         }
         echo '</td><td valign="top">'; ?>
             <div style="float:left; width:110px">
             <?php
-            if (api_get_setting('show_courses_descriptions_in_catalog') == 'true') {
+            if ('true' == api_get_setting('show_courses_descriptions_in_catalog')) {
                 $icon_title = get_lang('Course description').' - '.$course['title']; ?>
             <a href="<?php echo api_get_path(WEB_CODE_PATH); ?>inc/ajax/course_home.ajax.php?a=show_course_information&code=<?php echo $course['code']; ?>" data-title="<?php echo $icon_title; ?>" title="<?php echo $icon_title; ?>" class="ajax">
                 <?php echo Display::return_icon('info.png', $icon_title, '', '22'); ?>
@@ -430,8 +430,8 @@ if (!empty($courses_without_category)) {
                 </div>
                  <div style="float:left; margin-right:10px;">
             <?php
-                if ($course['status'] != 1) {
-                    if ($course['unsubscr'] == 1) {
+                if (1 != $course['status']) {
+                    if (1 == $course['unsubscr']) {
                         ?>
                 <!-- changed link to submit to avoid action by the search tool indexer -->
                 <form action="<?php echo api_get_self(); ?>" method="post" onsubmit="javascript: if (!confirm('<?php echo addslashes(api_htmlentities(get_lang("Are you sure you want to unsubscribe?"), ENT_QUOTES, api_get_system_encoding())); ?>')) return false;">
diff --git a/public/main/auth/unsubscribe_account.php b/public/main/auth/unsubscribe_account.php
index 755834539d..8f18c35b29 100644
--- a/public/main/auth/unsubscribe_account.php
+++ b/public/main/auth/unsubscribe_account.php
@@ -3,7 +3,7 @@
 
 require_once __DIR__.'/../inc/global.inc.php';
 
-if (api_get_setting('platform_unsubscribe_allowed') != 'true') {
+if ('true' != api_get_setting('platform_unsubscribe_allowed')) {
     api_not_allowed();
 }
 
diff --git a/public/main/badge/assertion.php b/public/main/badge/assertion.php
index 132e0f4464..7fe0786fdb 100644
--- a/public/main/badge/assertion.php
+++ b/public/main/badge/assertion.php
@@ -5,8 +5,6 @@
  * Show information about a new assertion.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.badge
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -15,7 +13,7 @@ $skillId = isset($_GET['skill']) ? (int) $_GET['skill'] : 0;
 $courseId = isset($_GET['course']) ? (int) $_GET['course'] : 0;
 $sessionId = isset($_GET['session']) ? (int) $_GET['session'] : 0;
 
-if ($userId === 0 || $skillId === 0) {
+if (0 === $userId || 0 === $skillId) {
     exit;
 }
 
@@ -32,7 +30,7 @@ $userSkill = $objSkillRelUser->getByUserAndSkill(
     $sessionId
 );
 
-if ($userSkill == false) {
+if (false == $userSkill) {
     exit;
 }
 
diff --git a/public/main/badge/assign.php b/public/main/badge/assign.php
index ab241f1e00..4a3d7eea3d 100644
--- a/public/main/badge/assign.php
+++ b/public/main/badge/assign.php
@@ -120,7 +120,7 @@ if (!$profile) {
             break;
         }
 
-        if (!$profile && $parent['parent_id'] == 0) {
+        if (!$profile && 0 == $parent['parent_id']) {
             $profile = $skillLevelRepo->findAll();
             $profile = isset($profile[0]) ? $profile[0] : false;
         }
@@ -227,7 +227,7 @@ $form->addHidden('user', $user->getId());
 $form->addHidden('id', $skillId);
 $form->addRule('skill', get_lang('Required field'), 'required');
 
-$showLevels = api_get_configuration_value('hide_skill_levels') === false;
+$showLevels = false === api_get_configuration_value('hide_skill_levels');
 
 if ($showLevels) {
     $form->addSelect('acquired_level', get_lang('Level acquired'), $acquiredLevel);
@@ -364,7 +364,7 @@ if (api_is_drh()) {
         'url' => api_get_path(WEB_CODE_PATH).'mySpace/index.php',
         "name" => get_lang('Reporting'),
     ];
-    if ($user->getStatus() == COURSEMANAGER) {
+    if (COURSEMANAGER == $user->getStatus()) {
         $interbreadcrumb[] = [
             "url" => api_get_path(WEB_CODE_PATH).'mySpace/teachers.php',
             'name' => get_lang('Trainers'),
diff --git a/public/main/badge/class.php b/public/main/badge/class.php
index a880b85e92..2c23e93ff3 100644
--- a/public/main/badge/class.php
+++ b/public/main/badge/class.php
@@ -5,8 +5,6 @@
  * Show information about the OpenBadge class.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.badge
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/badge/criteria.php b/public/main/badge/criteria.php
index 847ca27262..1f1ebf0c7e 100644
--- a/public/main/badge/criteria.php
+++ b/public/main/badge/criteria.php
@@ -5,8 +5,6 @@
  * Show information about OpenBadge criteria.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.badge
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/badge/issued.php b/public/main/badge/issued.php
index be3d143d7b..dce091b4c7 100644
--- a/public/main/badge/issued.php
+++ b/public/main/badge/issued.php
@@ -10,8 +10,6 @@ use SkillRelUser as SkillRelUserManager;
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
  * @author José Loguercio Silva <jose.loguercio@beeznest.com>
- *
- * @package chamilo.badge
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -55,7 +53,7 @@ if (!Skill::isToolAvailable()) {
     api_not_allowed(true);
 }
 
-$showLevels = api_get_configuration_value('hide_skill_levels') === false;
+$showLevels = false === api_get_configuration_value('hide_skill_levels');
 
 $skillInfo = [
     'id' => $skill->getId(),
@@ -145,7 +143,7 @@ if (!$profile) {
             break;
         }
 
-        if (!$profile && $parent['parent_id'] == 0) {
+        if (!$profile && 0 == $parent['parent_id']) {
             $profile = $skillLevelRepo->findAll();
             if ($profile) {
                 $profile = $profile[0];
@@ -233,7 +231,7 @@ if ($allowExport) {
     $backpack = 'https://backpack.openbadges.org/';
     $configBackpack = api_get_setting('openbadges_backpack');
 
-    if (strcmp($backpack, $configBackpack) !== 0) {
+    if (0 !== strcmp($backpack, $configBackpack)) {
         $backpack = $configBackpack;
     }
 
diff --git a/public/main/badge/issued_all.php b/public/main/badge/issued_all.php
index 346741fa97..b06e6d9a29 100644
--- a/public/main/badge/issued_all.php
+++ b/public/main/badge/issued_all.php
@@ -9,8 +9,6 @@ use SkillRelUser as SkillRelUserManager;
  * Show information about all issued badges with same skill by user.
  *
  * @author José Loguercio Silva <jose.loguercio@beeznest.com>
- *
- * @package chamilo.badge
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -130,7 +128,7 @@ foreach ($userSkills as $index => $skillIssue) {
                 break;
             }
 
-            if (!$profile && $parent['parent_id'] == 0) {
+            if (!$profile && 0 == $parent['parent_id']) {
                 $profile = $skillLevelRepo->findAll();
                 $profile = !empty($profile) ? $profile[0] : [];
             }
@@ -220,7 +218,7 @@ foreach ($userSkills as $index => $skillIssue) {
         $backpack = 'https://backpack.openbadges.org/';
         $configBackpack = api_get_setting('openbadges_backpack');
 
-        if (strcmp($backpack, $configBackpack) !== 0) {
+        if (0 !== strcmp($backpack, $configBackpack)) {
             $backpack = $configBackpack;
         }
 
@@ -275,7 +273,7 @@ foreach ($userSkills as $index => $skillIssue) {
 
 $template = new Template(get_lang('Issued badge information'));
 $template->assign('user_badges', $allUserBadges);
-$template->assign('show_level', api_get_configuration_value('hide_skill_levels') == false);
+$template->assign('show_level', false == api_get_configuration_value('hide_skill_levels'));
 
 $content = $template->fetch(
     $template->get_template('skill/issued_all.tpl')
diff --git a/public/main/badge/issuer.php b/public/main/badge/issuer.php
index 1bfb97e834..9302200dd6 100644
--- a/public/main/badge/issuer.php
+++ b/public/main/badge/issuer.php
@@ -5,8 +5,6 @@
  * Show information about the OpenBadge issuer.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.badge
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/blog/blog.php b/public/main/blog/blog.php
index 7d04c30aa7..93fd38fcc2 100644
--- a/public/main/blog/blog.php
+++ b/public/main/blog/blog.php
@@ -135,15 +135,15 @@ if (!empty($_GET['unregister'])) {
     Blog::unsubscribeUser($_GET['blog_id'], $_GET['user_id']);
 }
 
-if (isset($_GET['action']) && $_GET['action'] == 'manage_tasks') {
-    if (isset($_GET['do']) && $_GET['do'] == 'delete') {
+if (isset($_GET['action']) && 'manage_tasks' == $_GET['action']) {
+    if (isset($_GET['do']) && 'delete' == $_GET['do']) {
         Blog::deleteTask($blog_id, (int) $_GET['task_id']);
         Display::addFlash(
             Display::return_message(get_lang('The task has been deleted.'), 'success')
         );
     }
 
-    if (isset($_GET['do']) && $_GET['do'] == 'delete_assignment') {
+    if (isset($_GET['do']) && 'delete_assignment' == $_GET['do']) {
         Blog::deleteAssignedTask($blog_id, intval($_GET['task_id']), intval($_GET['user_id']));
         Display::addFlash(
             Display::return_message(get_lang('The task assignment has been deleted.'), 'success')
@@ -151,10 +151,10 @@ if (isset($_GET['action']) && $_GET['action'] == 'manage_tasks') {
     }
 }
 
-if (isset($_GET['action']) && $_GET['action'] == 'view_post') {
+if (isset($_GET['action']) && 'view_post' == $_GET['action']) {
     $task_id = (isset($_GET['task_id']) && is_numeric($_GET['task_id'])) ? $_GET['task_id'] : 0;
 
-    if (isset($_GET['do']) && $_GET['do'] == 'delete_comment') {
+    if (isset($_GET['do']) && 'delete_comment' == $_GET['do']) {
         if (api_is_allowed('BLOG_'.$blog_id, 'article_comments_delete', $task_id)) {
             Blog::deleteComment($blog_id, (int) $_GET['post_id'], (int) $_GET['comment_id']);
             Display::addFlash(
@@ -167,7 +167,7 @@ if (isset($_GET['action']) && $_GET['action'] == 'view_post') {
         }
     }
 
-    if (isset($_GET['do']) && $_GET['do'] == 'delete_article') {
+    if (isset($_GET['do']) && 'delete_article' == $_GET['do']) {
         if (api_is_allowed('BLOG_'.$blog_id, 'article_delete', $task_id)) {
             Blog::deletePost($blog_id, (int) $_GET['article_id']);
             $action = ''; // Article is gone, go to blog home
@@ -180,8 +180,8 @@ if (isset($_GET['action']) && $_GET['action'] == 'view_post') {
             );
         }
     }
-    if (isset($_GET['do']) && $_GET['do'] == 'rate') {
-        if (isset($_GET['type']) && $_GET['type'] == 'post') {
+    if (isset($_GET['do']) && 'rate' == $_GET['do']) {
+        if (isset($_GET['type']) && 'post' == $_GET['type']) {
             if (api_is_allowed('BLOG_'.$blog_id, 'article_rate')) {
                 Blog::addRating('post', $blog_id, (int) $_GET['post_id'], (int) $_GET['rating']);
                 Display::addFlash(
@@ -189,7 +189,7 @@ if (isset($_GET['action']) && $_GET['action'] == 'view_post') {
                 );
             }
         }
-        if (isset($_GET['type']) && $_GET['type'] == 'comment') {
+        if (isset($_GET['type']) && 'comment' == $_GET['type']) {
             if (api_is_allowed('BLOG_'.$blog_id, 'article_comments_add')) {
                 Blog::addRating('comment', $blog_id, (int) $_GET['comment_id'], (int) $_GET['rating']);
                 Display::addFlash(
@@ -269,7 +269,7 @@ $calendarBlog = Blog::displayMiniMonthCalendar($month, $year, $blog_id);
 //task blogs
 $taskBlog = Blog::getPersonalTasksList();
 
-if (isset($flag) && $flag == '1') {
+if (isset($flag) && '1' == $flag) {
     $action = "manage_tasks";
     Blog::displayTaskAssignmentForm($blog_id);
 }
@@ -295,7 +295,7 @@ if (isset($_GET['task_id']) && is_numeric($_GET['task_id'])) {
     $result = Database::query($sql);
     $row = Database::fetch_array($result);
 
-    if ($row['number'] == 1) {
+    if (1 == $row['number']) {
         $user_task = true;
     }
 }
@@ -368,19 +368,19 @@ switch ($action) {
     case 'manage_tasks':
         if (api_is_allowed('BLOG_'.$blog_id, 'task_management')) {
             $task = null;
-            if (isset($_GET['do']) && $_GET['do'] == 'add') {
+            if (isset($_GET['do']) && 'add' == $_GET['do']) {
                 $task .= Blog::displayTaskCreateForm($blog_id);
             }
-            if (isset($_GET['do']) && $_GET['do'] == 'assign') {
+            if (isset($_GET['do']) && 'assign' == $_GET['do']) {
                 $task .= Blog::displayTaskAssignmentForm($blog_id);
             }
-            if (isset($_GET['do']) && $_GET['do'] == 'edit') {
+            if (isset($_GET['do']) && 'edit' == $_GET['do']) {
                 $task .= Blog::displayTaskEditForm(
                     $blog_id,
                     intval($_GET['task_id'])
                 );
             }
-            if (isset($_GET['do']) && $_GET['do'] == 'edit_assignment') {
+            if (isset($_GET['do']) && 'edit_assignment' == $_GET['do']) {
                 $task .= Blog::displayAssignedTaskEditForm(
                     $blog_id,
                     intval($_GET['task_id']),
diff --git a/public/main/blog/blog_admin.php b/public/main/blog/blog_admin.php
index 8053cd05d8..b7307561d5 100644
--- a/public/main/blog/blog_admin.php
+++ b/public/main/blog/blog_admin.php
@@ -26,16 +26,16 @@ if (api_is_allowed_to_edit()) {
     // showing the header if we are not in the learning path, if we are in
     // the learning path, we do not include the banner so we have to explicitly
     // include the stylesheet, which is normally done in the header
-    if ($origin != 'learnpath') {
+    if ('learnpath' != $origin) {
         $interbreadcrumb[] = [
             'url' => 'blog_admin.php?'.api_get_cidreq(),
             'name' => $nameTools,
         ];
         $my_url = '';
-        if ($action == 'add') {
+        if ('add' == $action) {
             $current_section = get_lang('Create a new project');
             $my_url = 'action=add';
-        } elseif ($action == 'edit') {
+        } elseif ('edit' == $action) {
             $current_section = get_lang('Edit a project');
             $my_url = 'action=edit&amp;blog_id='.Security::remove_XSS($_GET['blog_id']);
         }
@@ -58,16 +58,16 @@ if (api_is_allowed_to_edit()) {
             echo Display::return_message(get_lang('The project has been edited.'), 'confirmation');
         }
     }
-    if (isset($_GET['action']) && $_GET['action'] == 'visibility') {
+    if (isset($_GET['action']) && 'visibility' == $_GET['action']) {
         Blog::changeBlogVisibility(intval($_GET['blog_id']));
         echo Display::return_message(get_lang('The visibility has been changed.'), 'confirmation');
     }
-    if (isset($_GET['action']) && $_GET['action'] == 'delete') {
+    if (isset($_GET['action']) && 'delete' == $_GET['action']) {
         Blog::deleteBlog(intval($_GET['blog_id']));
         echo Display::return_message(get_lang('The project has been deleted.'), 'confirmation');
     }
 
-    if (isset($_GET['action']) && $_GET['action'] == 'add') {
+    if (isset($_GET['action']) && 'add' == $_GET['action']) {
         // we show the form if
         // 1. no post data
         // 2. there is post data and one of the required form elements is empty
@@ -76,7 +76,7 @@ if (api_is_allowed_to_edit()) {
         }
     }
 
-    if (isset($_GET['action']) && $_GET['action'] == 'edit') {
+    if (isset($_GET['action']) && 'edit' == $_GET['action']) {
         // we show the form if
         // 1. no post data
         // 2. there is post data and one of the three form elements is empty
diff --git a/public/main/calendar/agenda.php b/public/main/calendar/agenda.php
index 470873fbcc..3aa543c3f3 100644
--- a/public/main/calendar/agenda.php
+++ b/public/main/calendar/agenda.php
@@ -86,7 +86,7 @@ $nameTools = get_lang('Agenda');
 
 Event::event_access_tool(TOOL_CALENDAR_EVENT);
 
-if ($type === 'fromjs') {
+if ('fromjs' === $type) {
     // split the "id" parameter only if string and there are _ separators
     if (preg_match('/_/', $eventId)) {
         $id_list = explode('_', $eventId);
@@ -95,18 +95,18 @@ if ($type === 'fromjs') {
     }
     $eventId = $id_list[1];
     $event_type = $id_list[0];
-    $event_type = $event_type === 'platform' ? 'admin' : $event_type;
+    $event_type = 'platform' === $event_type ? 'admin' : $event_type;
 }
 
 $agenda = new Agenda($event_type);
 $allowToEdit = $agenda->getIsAllowedToEdit();
 $actions = $agenda->displayActions('calendar');
 
-if (!$allowToEdit && $event_type === 'course') {
+if (!$allowToEdit && 'course' === $event_type) {
     api_not_allowed(true);
 }
 
-if ($event_type === 'course') {
+if ('course' === $event_type) {
     $agendaUrl = api_get_path(WEB_CODE_PATH).'calendar/agenda_js.php?'.api_get_cidreq().'&type=course';
 } else {
     $agendaUrl = api_get_path(WEB_CODE_PATH).'calendar/agenda_js.php?&type='.$event_type;
diff --git a/public/main/calendar/agenda_js.php b/public/main/calendar/agenda_js.php
index a174ecdb10..13f0f9a2bc 100644
--- a/public/main/calendar/agenda_js.php
+++ b/public/main/calendar/agenda_js.php
@@ -9,7 +9,7 @@ $typeList = ['personal', 'course', 'admin', 'platform'];
 $type = isset($_REQUEST['type']) && in_array($_REQUEST['type'], $typeList) ? $_REQUEST['type'] : 'personal';
 $userId = isset($_REQUEST['user_id']) ? $_REQUEST['user_id'] : null;
 
-if ($type == 'personal' || $type == 'admin') {
+if ('personal' == $type || 'admin' == $type) {
     $cidReset = true; // fixes #5162
 }
 require_once __DIR__.'/../inc/global.inc.php';
@@ -22,12 +22,12 @@ $htmlHeadXtra[] = api_get_asset('fullcalendar/dist/locale-all.js');
 $htmlHeadXtra[] = api_get_asset('fullcalendar/dist/gcal.js');
 $htmlHeadXtra[] = api_get_css_asset('fullcalendar/dist/fullcalendar.min.css');*/
 
-if (api_is_platform_admin() && ($type == 'admin' || $type == 'platform')) {
+if (api_is_platform_admin() && ('admin' == $type || 'platform' == $type)) {
     $type = 'admin';
 }
 
 if (isset($_REQUEST['cidReq']) && !empty($_REQUEST['cidReq'])) {
-    if ($_REQUEST['cidReq'] == -1) {
+    if (-1 == $_REQUEST['cidReq']) {
         // When is out of the course tool (e.g My agenda)
         header('Location: '.api_get_self());
         exit;
@@ -109,7 +109,7 @@ switch ($type) {
 $tpl->assign('js_format_date', 'll');
 $region_value = api_get_language_isocode();
 
-if ($region_value == 'en') {
+if ('en' == $region_value) {
     $region_value = 'en-GB';
 }
 $tpl->assign('region_value', $region_value);
@@ -156,7 +156,7 @@ $tpl->assign('type', $type);
 
 $type_event_class = $type.'_event';
 $type_label = get_lang(ucfirst($type).'Calendar');
-if ($type == 'course' && !empty($group_id)) {
+if ('course' == $type && !empty($group_id)) {
     $type_event_class = 'group_event';
     $type_label = get_lang('Agenda');
 }
@@ -170,7 +170,7 @@ if (empty($defaultView)) {
 /* month, basicWeek, agendaWeek, agendaDay */
 $tpl->assign('default_view', $defaultView);
 
-if ($type == 'course' && !empty($session_id)) {
+if ('course' == $type && !empty($session_id)) {
     $type_event_class = 'session_event';
     $type_label = get_lang('Session calendar');
 }
@@ -219,7 +219,7 @@ if (!empty($userId)) {
     $agenda_ajax_url = api_get_path(WEB_AJAX_PATH).'agenda.ajax.php?type='.$type;
 }
 
-if ($type == 'course' && !empty($courseId)) {
+if ('course' == $type && !empty($courseId)) {
     $agenda_ajax_url .= '&'.api_get_cidreq();
 }
 
@@ -268,7 +268,7 @@ $form->addHtmlEditor(
     ]
 );
 
-if ($agenda->type === 'course') {
+if ('course' === $agenda->type) {
     $form->addHtml('<div id="add_as_announcement_div" style="display: none">');
     $form->addElement('checkbox', 'add_as_annonuncement', null, get_lang('Add as an announcement'));
     $form->addHtml('</div>');
diff --git a/public/main/calendar/agenda_list.php b/public/main/calendar/agenda_list.php
index 5b91400f92..9e7d28e1a9 100644
--- a/public/main/calendar/agenda_list.php
+++ b/public/main/calendar/agenda_list.php
@@ -47,7 +47,7 @@ $events = $agenda->getEvents(
 
 $this_section = SECTION_MYAGENDA;
 
-if (!empty($currentCourseId) && $currentCourseId != -1) {
+if (!empty($currentCourseId) && -1 != $currentCourseId) {
     // Agenda is inside a course tool
     $url = api_get_self().'?'.api_get_cidreq();
     $this_section = SECTION_COURSES;
@@ -89,11 +89,11 @@ $tpl->assign('agenda_actions', $actions);
 $tpl->assign('is_allowed_to_edit', api_is_allowed_to_edit());
 
 if (api_is_allowed_to_edit()) {
-    if ($action === 'change_visibility') {
+    if ('change_visibility' === $action) {
         $courseInfo = api_get_course_info();
         $courseCondition = '';
         // This happens when list agenda is not inside a course
-        if (($type === 'course' || $type === 'session' && !empty($courseInfo))) {
+        if (('course' === $type || 'session' === $type && !empty($courseInfo))) {
             // For course and session event types
             // Just needs course ID
             $agenda->changeVisibility($_GET['id'], $_GET['visibility'], $courseInfo);
diff --git a/public/main/calendar/download.php b/public/main/calendar/download.php
index 3dfe8fdc35..a6fa1bf461 100644
--- a/public/main/calendar/download.php
+++ b/public/main/calendar/download.php
@@ -6,8 +6,6 @@
  * Html files are parsed to fix a few problems with URLs,
  * but this code will hopefully be replaced soon by an Apache URL
  * rewrite mechanism.
- *
- * @package chamilo.calendar
  */
 session_cache_limiter('public');
 
@@ -50,7 +48,7 @@ $full_file_name = api_get_path(SYS_COURSE_PATH).$course_info['path'].'/upload/ca
 
 //if the rewrite rule asks for a directory, we redirect to the document explorer
 if (is_dir($full_file_name)) {
-    while ($doc_url[$dul = strlen($doc_url) - 1] == '/') {
+    while ('/' == $doc_url[$dul = strlen($doc_url) - 1]) {
         $doc_url = substr($doc_url, 0, $dul);
     }
     // create the path
@@ -79,7 +77,7 @@ if (Database::num_rows($result)) {
         api_get_path(SYS_COURSE_PATH).$course_info['path'].'/upload/calendar/'
     )) {
         $result = DocumentManager::file_send_for_download($full_file_name, true, $title);
-        if ($result === false) {
+        if (false === $result) {
             api_not_allowed(true);
         }
     }
diff --git a/public/main/course_description/add.php b/public/main/course_description/add.php
index 472f05d7f9..c5a58b2edc 100644
--- a/public/main/course_description/add.php
+++ b/public/main/course_description/add.php
@@ -5,8 +5,6 @@
  * View (MVC patter) for adding a course description.
  *
  * @author Christian Fasanando <christian1827@gmail.com>
- *
- * @package chamilo.course_description
  */
 
 // protect a course script
@@ -26,7 +24,7 @@ echo '<a href="index.php?'.api_get_cidreq().'">'.
     '</a>';
 ksort($categories);
 foreach ($categories as $id => $title) {
-    if ($i == ADD_BLOCK) {
+    if (ADD_BLOCK == $i) {
         echo '<a href="index.php?'.api_get_cidreq().'&action=add">'.
             Display::return_icon($default_description_icon[$id], $title, '', ICON_SIZE_MEDIUM).'</a>';
         break;
@@ -39,7 +37,7 @@ foreach ($categories as $id => $title) {
 echo '</div>';
 
 // error messages
-if (isset($error) && intval($error) == 1) {
+if (isset($error) && 1 == intval($error)) {
     echo Display::return_message(
         get_lang('The form contains incorrect or incomplete data. Please check your input.'),
         'error',
diff --git a/public/main/course_description/course_description_controller.php b/public/main/course_description/course_description_controller.php
index 66f8d1f7e7..f28df0e225 100644
--- a/public/main/course_description/course_description_controller.php
+++ b/public/main/course_description/course_description_controller.php
@@ -7,8 +7,6 @@
  * it should be included inside a dispatcher file (e.g: index.php).
  *
  * @author Christian Fasanando <christian1827@gmail.com>
- *
- * @package chamilo.course_description
  */
 class CourseDescriptionController
 {
@@ -66,8 +64,8 @@ class CourseDescriptionController
 
         foreach ($data['descriptions'] as $id => $description) {
             if (!empty($description['content'])
-                && strpos($description['content'], '<iframe') !== false
-                && $browser['name'] == 'Chrome'
+                && false !== strpos($description['content'], '<iframe')
+                && 'Chrome' == $browser['name']
             ) {
                 header("X-XSS-Protection: 0");
             }
@@ -89,7 +87,7 @@ class CourseDescriptionController
 
             ksort($categories);
             foreach ($categories as $id => $title) {
-                if ($i == ADD_BLOCK) {
+                if (ADD_BLOCK == $i) {
                     $actionLeft .= '<a href="index.php?'.api_get_cidreq().'&action=add">'.
                         Display::return_icon(
                             $data['default_description_icon'][$id],
@@ -140,7 +138,7 @@ class CourseDescriptionController
         $data = [];
         $data['id'] = $id;
         $affected_rows = null;
-        if (strtoupper($_SERVER['REQUEST_METHOD']) == "POST") {
+        if ("POST" == strtoupper($_SERVER['REQUEST_METHOD'])) {
             if (!empty($_POST['title']) && !empty($_POST['contentDescription'])) {
                 if (1) {
                     $title = $_POST['title'];
@@ -251,7 +249,7 @@ class CourseDescriptionController
         $course_description->set_session_id($session_id);
 
         $data = [];
-        if (strtoupper($_SERVER['REQUEST_METHOD']) == "POST") {
+        if ("POST" == strtoupper($_SERVER['REQUEST_METHOD'])) {
             if (!empty($_POST['title']) && !empty($_POST['contentDescription'])) {
                 if (1) {
                     $title = $_POST['title'];
diff --git a/public/main/course_description/edit.php b/public/main/course_description/edit.php
index aa6da33de2..40dd298eb9 100644
--- a/public/main/course_description/edit.php
+++ b/public/main/course_description/edit.php
@@ -5,8 +5,6 @@
  * View (MVC patter) for editing a course description.
  *
  * @author Christian Fasanando <christian1827@gmail.com>
- *
- * @package chamilo.course_description
  */
 
 // protect a course script
@@ -45,7 +43,7 @@ echo '<a href="index.php?'.api_get_cidreq().'">'.
 
 ksort($categories);
 foreach ($categories as $id => $title) {
-    if ($i == ADD_BLOCK) {
+    if (ADD_BLOCK == $i) {
         echo '<a href="index.php?'.api_get_cidreq().'&action=add">'.
             Display::return_icon($default_description_icon[$id], $title, '', ICON_SIZE_MEDIUM).'</a>';
         break;
@@ -58,7 +56,7 @@ foreach ($categories as $id => $title) {
 echo '</div>';
 
 // error messages
-if (isset($error) && intval($error) == 1) {
+if (isset($error) && 1 == intval($error)) {
     echo Display::return_message(get_lang('The form contains incorrect or incomplete data. Please check your input.'), 'error', false);
 }
 
diff --git a/public/main/course_description/index.php b/public/main/course_description/index.php
index b8e4673b9f..83ff56843e 100644
--- a/public/main/course_description/index.php
+++ b/public/main/course_description/index.php
@@ -6,8 +6,6 @@
  * to the controllers depend on the current action.
  *
  * @author Christian Fasanando <christian1827@gmail.com>
- *
- * @package chamilo.course_description
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_COURSE_DESCRIPTION;
@@ -42,34 +40,34 @@ if (isset($_GET['id'])) {
     $id = intval($_GET['id']);
 }
 
-if (isset($_GET['isStudentView']) && $_GET['isStudentView'] == 'true') {
+if (isset($_GET['isStudentView']) && 'true' == $_GET['isStudentView']) {
     $action = 'listing';
 }
 
 // interbreadcrumb
 $interbreadcrumb[] = ["url" => "index.php?".api_get_cidreq(), "name" => get_lang('Description')];
-if ($description_type == 1) {
+if (1 == $description_type) {
     $interbreadcrumb[] = ["url" => "#", "name" => get_lang('Description')];
 }
-if ($description_type == 2) {
+if (2 == $description_type) {
     $interbreadcrumb[] = ["url" => "#", "name" => get_lang('Objectives')];
 }
-if ($description_type == 3) {
+if (3 == $description_type) {
     $interbreadcrumb[] = ["url" => "#", "name" => get_lang('Topics')];
 }
-if ($description_type == 4) {
+if (4 == $description_type) {
     $interbreadcrumb[] = ["url" => "#", "name" => get_lang('Methodology')];
 }
-if ($description_type == 5) {
+if (5 == $description_type) {
     $interbreadcrumb[] = ["url" => "#", "name" => get_lang('Course material')];
 }
-if ($description_type == 6) {
+if (6 == $description_type) {
     $interbreadcrumb[] = ["url" => "#", "name" => get_lang('Resources')];
 }
-if ($description_type == 7) {
+if (7 == $description_type) {
     $interbreadcrumb[] = ["url" => "#", "name" => get_lang('Assessment')];
 }
-if ($description_type == 8) {
+if (8 == $description_type) {
     $interbreadcrumb[] = ["url" => "#", "name" => get_lang('Thematic advance')];
 }
 if ($description_type >= 9) {
diff --git a/public/main/course_description/layout.php b/public/main/course_description/layout.php
index 997b971d6c..acd6b76898 100644
--- a/public/main/course_description/layout.php
+++ b/public/main/course_description/layout.php
@@ -5,8 +5,6 @@
  * Layout (principal view) used for structuring other views.
  *
  * @author Christian Fasanando <christian1827@gmail.com>
- *
- * @package chamilo.course_description
  */
 
 // protect a course script
diff --git a/public/main/course_info/delete_course.php b/public/main/course_info/delete_course.php
index 554d9f42fd..beda829704 100644
--- a/public/main/course_info/delete_course.php
+++ b/public/main/course_info/delete_course.php
@@ -7,8 +7,6 @@ use ChamiloSession as Session;
  * This script is about deleting a course.
  * It displays a message box ('are you sure you wish to delete this course')
  * and deletes the course if the user answers affirmatively.
- *
- * @package chamilo.course_info
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $this_section = SECTION_COURSES;
@@ -26,7 +24,7 @@ if (!api_is_allowed_to_edit()) {
 
 $tool_name = get_lang('Completely delete this course');
 
-if (isset($_GET['delete']) && $_GET['delete'] === 'yes') {
+if (isset($_GET['delete']) && 'yes' === $_GET['delete']) {
     CourseManager::delete_course($_course['sysCode']);
 
     // DELETE CONFIRMATION MESSAGE
diff --git a/public/main/course_info/download.php b/public/main/course_info/download.php
index 737d07ac0e..fa6f5a7c58 100644
--- a/public/main/course_info/download.php
+++ b/public/main/course_info/download.php
@@ -5,8 +5,6 @@ use Chamilo\CourseBundle\Component\CourseCopy\CourseArchiver;
 
 /**
  * Download script for course info.
- *
- * @package chamilo.course_info
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $this_section = SECTION_COURSES;
@@ -32,7 +30,7 @@ if (in_array($extension, ['xml', 'csv']) &&
     (api_is_platform_admin(true) || api_is_drh())
 ) {
     $content_type = 'application/force-download';
-} elseif ($extension === 'zip' && $_cid && (api_is_platform_admin(true) || api_is_course_admin())) {
+} elseif ('zip' === $extension && $_cid && (api_is_platform_admin(true) || api_is_course_admin())) {
     $content_type = 'application/force-download';
 }
 
diff --git a/public/main/course_info/infocours.php b/public/main/course_info/infocours.php
index 43e2a4c1d1..7a7b2f5d93 100644
--- a/public/main/course_info/infocours.php
+++ b/public/main/course_info/infocours.php
@@ -40,7 +40,7 @@ $router = Container::getRouter();
 $translator = Container::getTranslator();
 
 $show_delete_watermark_text_message = false;
-if (api_get_setting('pdf_export_watermark_by_course') == 'true') {
+if ('true' == api_get_setting('pdf_export_watermark_by_course')) {
     if (isset($_GET['delete_watermark'])) {
         PDF::delete_watermark($course_code);
         $show_delete_watermark_text_message = true;
@@ -165,11 +165,11 @@ $form->addRule(
 );
 $form->addElement('checkbox', 'delete_picture', null, get_lang('Delete picture'));
 
-if (api_get_setting('pdf_export_watermark_by_course') == 'true') {
+if ('true' == api_get_setting('pdf_export_watermark_by_course')) {
     $url = PDF::get_watermark($course_code);
     $form->addText('pdf_export_watermark_text', get_lang('PDF watermark text'), false, ['size' => '60']);
     $form->addElement('file', 'pdf_export_watermark_path', get_lang('Upload a watermark image'));
-    if ($url != false) {
+    if (false != $url) {
         $delete_url = '<a href="?delete_watermark">'.Display::return_icon('delete.png', get_lang('Remove picture')).'</a>';
         $form->addElement(
             'html',
@@ -184,7 +184,7 @@ if (api_get_setting('pdf_export_watermark_by_course') == 'true') {
     );
 }
 
-if (api_get_setting('allow_course_theme') == 'true') {
+if ('true' == api_get_setting('allow_course_theme')) {
     $group = [];
     $group[] = $form->createElement(
         'SelectTheme',
@@ -311,7 +311,7 @@ $form->addPanelOption(
 
 // Documents
 $globalGroup = [];
-if (api_get_setting('documents_default_visibility_defined_in_course') == 'true') {
+if ('true' == api_get_setting('documents_default_visibility_defined_in_course')) {
     $group = [
         $form->createElement('radio', 'documents_default_visibility', null, get_lang('Visible'), 'visible'),
         $form->createElement('radio', 'documents_default_visibility', null, get_lang('invisible'), 'invisible'),
@@ -610,7 +610,7 @@ $group[] = $form->createElement('radio', 'enable_lp_auto_launch', null, get_lang
 
 $globalGroup[get_lang('Enable learning path auto-launch')] = $group;
 
-if (api_get_setting('allow_course_theme') == 'true') {
+if ('true' == api_get_setting('allow_course_theme')) {
     // Allow theme into Learning path
     $group = [];
     $group[] = $form->createElement(
@@ -632,7 +632,7 @@ if (api_get_setting('allow_course_theme') == 'true') {
 }
 
 $allowLPReturnLink = api_get_setting('allow_lp_return_link');
-if ($allowLPReturnLink === 'true') {
+if ('true' === $allowLPReturnLink) {
     $group = [
         $form->createElement(
             'radio',
@@ -662,8 +662,8 @@ if ($allowLPReturnLink === 'true') {
 $exerciseInvisible = api_get_setting('exercise_invisible_in_session');
 $configureExerciseVisibility = api_get_setting('configure_exercise_visibility_in_course');
 
-if ($exerciseInvisible === 'true' &&
-    $configureExerciseVisibility === 'true'
+if ('true' === $exerciseInvisible &&
+    'true' === $configureExerciseVisibility
 ) {
     $group = [
         $form->createElement(
@@ -795,7 +795,7 @@ $form->addPanelOption(
     'accordionSettings'
 );
 
-if (api_get_setting('allow_public_certificates') === 'true') {
+if ('true' === api_get_setting('allow_public_certificates')) {
     $group = [];
     $group[] = $form->createElement(
         'radio',
@@ -926,7 +926,7 @@ $courseSettings = CourseManager::getCourseSettingVariables($appPlugin);
 
 foreach ($courseSettings as $setting) {
     $result = api_get_course_setting($setting);
-    if ($result != '-1') {
+    if ('-1' != $result) {
         $values[$setting] = $result;
     }
 }
@@ -969,7 +969,7 @@ if ($form->validate() && $isEditable) {
         $courseInfo = api_get_course_info_by_id($courseId);
 
         // Check if
-        if ($courseInfo['visibility'] == COURSE_VISIBILITY_HIDDEN &&
+        if (COURSE_VISIBILITY_HIDDEN == $courseInfo['visibility'] &&
             $visibility != $courseInfo['visibility']
         ) {
             $num = CourseManager::countActiveCourses($urlId);
diff --git a/public/main/course_info/legal.php b/public/main/course_info/legal.php
index eee5cfd5ff..88b750c3b2 100644
--- a/public/main/course_info/legal.php
+++ b/public/main/course_info/legal.php
@@ -23,7 +23,7 @@ $enabled = api_get_plugin_setting('courselegal', 'tool_enable');
 $pluginExtra = null;
 $pluginLegal = false;
 
-if ($enabled == 'true') {
+if ('true' == $enabled) {
     $pluginLegal = true;
     require_once api_get_path(SYS_PLUGIN_PATH).'courselegal/config.php';
     $plugin = CourseLegalPlugin::create();
@@ -54,7 +54,7 @@ $form = new FormValidator('legal', 'GET', api_get_self().'?course_code='.$course
 $pluginMessage = null;
 $hideForm = false;
 if ($pluginLegal && isset($userData) && !empty($userData)) {
-    if ($userData['web_agreement'] == 1) {
+    if (1 == $userData['web_agreement']) {
         if (empty($userData['mail_agreement'])) {
             $pluginMessage = Display::return_message(
                 $plugin->get_lang('You need to confirm your agreement to our terms first. Please check your e-mail.')
@@ -80,7 +80,7 @@ $url = api_get_course_url($course_code, $session_id);
 if ($form->validate()) {
     $accept_legal = $form->exportValue('accept_legal');
 
-    if ($accept_legal == 1) {
+    if (1 == $accept_legal) {
         CourseManager::save_user_legal($user_id, $course_code, $session_id);
         if (api_check_user_access_to_legal($course_info['visibility'])) {
             Session::write($variable, true);
@@ -140,7 +140,7 @@ if (empty($session_id)) {
 
 Display :: display_header();
 echo $pluginMessage;
-if ($hideForm == false) {
+if (false == $hideForm) {
     $form->display();
 }
 Display :: display_footer();
diff --git a/public/main/course_info/maintenance.php b/public/main/course_info/maintenance.php
index 0f03471555..8a6b8e603b 100644
--- a/public/main/course_info/maintenance.php
+++ b/public/main/course_info/maintenance.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * @author Created on 18 October 2006 by Elixir Interactive http://www.elixir-interactive.com
- *
- * @package chamilo.course_info
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_COURSE_MAINTENANCE;
diff --git a/public/main/course_info/maintenance_coach.php b/public/main/course_info/maintenance_coach.php
index fd928dd352..032e30b15b 100644
--- a/public/main/course_info/maintenance_coach.php
+++ b/public/main/course_info/maintenance_coach.php
@@ -5,8 +5,6 @@
  *
  * @author Julio Montoya <julio.montoya@beeznest.com>
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.course_info
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -19,7 +17,7 @@ api_protect_course_script(true);
 api_block_anonymous_users();
 
 $sessionsCopy = api_get_setting('allow_session_course_copy_for_teachers');
-if ($sessionsCopy !== 'true') {
+if ('true' !== $sessionsCopy) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/course_progress/index.php b/public/main/course_progress/index.php
index 7e751e1620..cc1f66929b 100644
--- a/public/main/course_progress/index.php
+++ b/public/main/course_progress/index.php
@@ -8,8 +8,6 @@ use ChamiloSession as Session;
  *
  * @author Christian Fasanando <christian1827@gmail.com>
  * @author Julio Montoya <gugli100@gmail.com> Bugfixes session support
- *
- * @package chamilo.course_progress
  */
 
 // including files
@@ -55,15 +53,15 @@ if (isset($_REQUEST['action']) && in_array($_REQUEST['action'], $actions)) {
     $action = $_REQUEST['action'];
 }
 
-if (isset($_POST['action']) && $_POST['action'] == 'thematic_delete_select') {
+if (isset($_POST['action']) && 'thematic_delete_select' == $_POST['action']) {
     $action = 'thematic_delete_select';
 }
 
-if (isset($_GET['isStudentView']) && $_GET['isStudentView'] == 'true') {
+if (isset($_GET['isStudentView']) && 'true' == $_GET['isStudentView']) {
     $action = 'thematic_details';
 }
 
-if ($action == 'thematic_details' || $action == 'thematic_list') {
+if ('thematic_details' == $action || 'thematic_list' == $action) {
     Session::write('thematic_control', $action);
 }
 
@@ -181,27 +179,27 @@ function check_per_custom_date(obj) {
 
 $thematicControl = Session::read('thematic_control');
 
-if ($action == 'thematic_list') {
+if ('thematic_list' == $action) {
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Thematic control')];
 }
-if ($action == 'thematic_add') {
+if ('thematic_add' == $action) {
     $interbreadcrumb[] = [
         'url' => 'index.php?'.api_get_cidreq().'&action='.$thematicControl,
         'name' => get_lang('Thematic control'),
     ];
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('New thematic section')];
 }
-if ($action == 'thematic_edit') {
+if ('thematic_edit' == $action) {
     $interbreadcrumb[] = [
         'url' => 'index.php?'.api_get_cidreq().'&action='.$thematicControl,
         'name' => get_lang('Thematic control'),
     ];
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Edit thematic section')];
 }
-if ($action == 'thematic_details') {
+if ('thematic_details' == $action) {
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Thematic control')];
 }
-if ($action == 'thematic_plan_list' || $action == 'thematic_plan_delete') {
+if ('thematic_plan_list' == $action || 'thematic_plan_delete' == $action) {
     $interbreadcrumb[] = [
         'url' => 'index.php?'.api_get_cidreq().'&action='.$thematicControl,
         'name' => get_lang('Thematic control'),
@@ -213,7 +211,7 @@ if ($action == 'thematic_plan_list' || $action == 'thematic_plan_delete') {
         ];
     }
 }
-if ($action == 'thematic_plan_add' || $action == 'thematic_plan_edit') {
+if ('thematic_plan_add' == $action || 'thematic_plan_edit' == $action) {
     $interbreadcrumb[] = [
         'url' => 'index.php?'.api_get_cidreq().'&action='.$thematicControl,
         'name' => get_lang('Thematic control'),
@@ -223,14 +221,14 @@ if ($action == 'thematic_plan_add' || $action == 'thematic_plan_edit') {
         'name' => get_lang('Thematic plan').' ('.$cleanThematicTitle.')',
     ];
 }
-if ($action == 'thematic_advance_list' || $action == 'thematic_advance_delete') {
+if ('thematic_advance_list' == $action || 'thematic_advance_delete' == $action) {
     $interbreadcrumb[] = [
         'url' => 'index.php?'.api_get_cidreq().'&action='.$thematicControl,
         'name' => get_lang('Thematic control'),
     ];
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Thematic advance').' ('.$cleanThematicTitle.')'];
 }
-if ($action == 'thematic_advance_add' || $action == 'thematic_advance_edit') {
+if ('thematic_advance_add' == $action || 'thematic_advance_edit' == $action) {
     $interbreadcrumb[] = [
         'url' => 'index.php?'.api_get_cidreq().'&action='.$thematicControl,
         'name' => get_lang('Thematic control'),
@@ -242,7 +240,7 @@ if ($action == 'thematic_advance_add' || $action == 'thematic_advance_edit') {
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('NewThematic advance')];
 }
 
-if ($action == 'thematic_plan_list') {
+if ('thematic_plan_list' == $action) {
     $htmlHeadXtra[] = "
         <script>
             $(function () {
diff --git a/public/main/course_progress/layout.php b/public/main/course_progress/layout.php
index 30c757ed1a..519c631ff6 100644
--- a/public/main/course_progress/layout.php
+++ b/public/main/course_progress/layout.php
@@ -5,8 +5,6 @@
  * Layout (principal view) used for structuring other views.
  *
  * @author Christian Fasanando <christian1827@gmail.com>
- *
- * @package chamilo.course_progress
  */
 
 // protect a course script
diff --git a/public/main/course_progress/thematic.php b/public/main/course_progress/thematic.php
index 716a27f4a1..3c97993f6c 100644
--- a/public/main/course_progress/thematic.php
+++ b/public/main/course_progress/thematic.php
@@ -6,8 +6,6 @@
  *
  * @author Christian Fasanando <christian1827@gmail.com>
  * @author Julio Montoya <gugli100@gmail.com> Bug fixing
- *
- * @package chamilo.course_progress
  */
 
 // protect a course script
@@ -69,7 +67,7 @@ if ($isTeacher) {
     $toolbar = Display::toolbarAction('thematic-bar', [$actionLeft]);
 }
 
-if ($action == 'thematic_list') {
+if ('thematic_list' == $action) {
     $table = new SortableTable(
         'thematic_list',
         ['Thematic', 'get_number_of_thematics'],
@@ -90,9 +88,9 @@ if ($action == 'thematic_list') {
         $table->set_form_actions(['thematic_delete_select' => get_lang('Delete all thematics')]);
     }
     $table->display();
-} elseif ($action == 'thematic_details') {
+} elseif ('thematic_details' == $action) {
     if (isset($_GET['thematic_plan_save_message']) &&
-        $_GET['thematic_plan_save_message'] == 'ok'
+        'ok' == $_GET['thematic_plan_save_message']
     ) {
         Display::addFlash(
             Display::return_message(
@@ -158,7 +156,7 @@ if ($action == 'thematic_list') {
                     'index.php?'.api_get_cidreq().'&action=thematic_copy&thematic_id='.$my_thematic_id.$params.$url_token,
                     ['class' => 'btn btn-default']
                 );
-                if (api_get_session_id() == 0) {
+                if (0 == api_get_session_id()) {
                     if ($thematic['display_order'] > 1) {
                         $toolbarThematic .= ' <a class="btn btn-default" href="'.api_get_self().'?action=moveup&'.api_get_cidreq().'&thematic_id='.$my_thematic_id.$params.$url_token.'">'.
                             Display::return_icon('up.png', get_lang('Up'), '', ICON_SIZE_TINY).'</a>';
@@ -223,10 +221,10 @@ if ($action == 'thematic_list') {
     $thematicLayout = $tpl->get_template('course_progress/progress.html.twig');
     $content = $tpl->fetch($thematicLayout);
     $tpl->assign('content', $content);
-} elseif ($action == 'thematic_add' || $action == 'thematic_edit') {
+} elseif ('thematic_add' == $action || 'thematic_edit' == $action) {
     // Display form
     $form = new FormValidator('thematic_add', 'POST', 'index.php?action=thematic_add&'.api_get_cidreq());
-    if ($action == 'thematic_edit') {
+    if ('thematic_edit' == $action) {
         $form->addElement('header', '', get_lang('Edit thematic section'));
     }
 
@@ -279,7 +277,7 @@ if ($action == 'thematic_list') {
     if ($show_form) {
         $html = $form->returnForm();
     }
-} elseif ($action == 'thematic_import_select') {
+} elseif ('thematic_import_select' == $action) {
     // Create form to upload csv file.
     $form = new FormValidator(
         'thematic_import',
diff --git a/public/main/course_progress/thematic_advance.php b/public/main/course_progress/thematic_advance.php
index 7d6c62d2f3..0d1088576a 100644
--- a/public/main/course_progress/thematic_advance.php
+++ b/public/main/course_progress/thematic_advance.php
@@ -6,8 +6,6 @@
  *
  * @author Christian Fasanando <christian1827@gmail.com>
  * @author Julio Montoya <gugli100@gmail.com> BeezNest 2011 Bug fixing
- *
- * @package chamilo.course_progress
  */
 
 // protect a course script
@@ -16,9 +14,9 @@ $tpl = new Template(get_lang('Thematic control'));
 $toolbar = null;
 $formLayout = null;
 
-if ($action === 'thematic_advance_add' || $action === 'thematic_advance_edit') {
+if ('thematic_advance_add' === $action || 'thematic_advance_edit' === $action) {
     $header_form = get_lang('New thematic advance');
-    if ($action === 'thematic_advance_edit') {
+    if ('thematic_advance_edit' === $action) {
         $header_form = get_lang('Edit thematic advance');
     }
 
@@ -65,7 +63,7 @@ if ($action === 'thematic_advance_add' || $action === 'thematic_advance_edit') {
     $form->addGroup($radios, null, get_lang('Start date options'));
 
     if (isset($thematic_advance_data['attendance_id']) &&
-        $thematic_advance_data['attendance_id'] == 0) {
+        0 == $thematic_advance_data['attendance_id']) {
         $form->addElement('html', '<div id="div_custom_datetime" style="display:block">');
     } else {
         $form->addElement('html', '<div id="div_custom_datetime" style="display:none">');
@@ -75,7 +73,7 @@ if ($action === 'thematic_advance_add' || $action === 'thematic_advance_edit') {
     $form->addElement('html', '</div>');
 
     if (isset($thematic_advance_data['attendance_id']) &&
-        $thematic_advance_data['attendance_id'] == 0
+        0 == $thematic_advance_data['attendance_id']
     ) {
         $form->addElement('html', '<div id="div_datetime_by_attendance" style="display:none">');
     } else {
@@ -134,7 +132,7 @@ if ($action === 'thematic_advance_add' || $action === 'thematic_advance_edit') {
         ]
     );
 
-    if ($action == 'thematic_advance_add') {
+    if ('thematic_advance_add' == $action) {
         $form->addButtonSave(get_lang('Save'));
     } else {
         $form->addButtonUpdate(get_lang('Save'));
@@ -144,7 +142,7 @@ if ($action === 'thematic_advance_add' || $action === 'thematic_advance_edit') {
     if (count($attendance_select) > 1) {
         $i = 1;
         foreach ($attendance_select as $key => $attendance_select_item) {
-            if ($i == 2) {
+            if (2 == $i) {
                 $attendance_select_item_id = $key;
                 break;
             }
@@ -199,9 +197,9 @@ if ($action === 'thematic_advance_add' || $action === 'thematic_advance_edit') {
         $thematic->set_thematic_advance_attributes(
             isset($values['thematic_advance_id']) ? $values['thematic_advance_id'] : null,
             $values['thematic_id'],
-            $values['start_date_type'] == 1 && isset($values['attendance_select']) ? $values['attendance_select'] : 0,
+            1 == $values['start_date_type'] && isset($values['attendance_select']) ? $values['attendance_select'] : 0,
             $values['content'],
-            $values['start_date_type'] == 2 ? $values['custom_start_date'] : $values['start_date_by_attendance'],
+            2 == $values['start_date_type'] ? $values['custom_start_date'] : $values['start_date_by_attendance'],
             $values['duration_in_hours']
         );
 
@@ -229,7 +227,7 @@ if ($action === 'thematic_advance_add' || $action === 'thematic_advance_edit') {
     }
 
     $formLayout = $form->returnForm();
-} elseif ($action == 'thematic_advance_list') {
+} elseif ('thematic_advance_list' == $action) {
     // thematic advance list
     echo '<div class="actions">';
     echo '<a href="'.api_get_self().'?'.api_get_cidreq().'&action=thematic_details">'.
diff --git a/public/main/course_progress/thematic_controller.php b/public/main/course_progress/thematic_controller.php
index a1a324e3e7..cbe2c3b6e9 100644
--- a/public/main/course_progress/thematic_controller.php
+++ b/public/main/course_progress/thematic_controller.php
@@ -16,8 +16,6 @@ use ChamiloSession as Session;
  *
  * @author Christian Fasanando <christian1827@gmail.com>
  * @author Julio Montoya <gugli100@gmail.com> token support improving UI
- *
- * @package chamilo.course_progress
  */
 class ThematicController
 {
@@ -42,7 +40,7 @@ class ThematicController
         $data = [];
         $check = Security::check_token('request');
         $thematic_id = isset($_REQUEST['thematic_id']) ? intval($_REQUEST['thematic_id']) : null;
-        $displayHeader = !empty($_REQUEST['display']) && $_REQUEST['display'] === 'no_header' ? false : true;
+        $displayHeader = !empty($_REQUEST['display']) && 'no_header' === $_REQUEST['display'] ? false : true;
         $courseId = api_get_course_int_id();
 
         if ($check) {
@@ -50,8 +48,8 @@ class ThematicController
                 case 'thematic_add':
                 case 'thematic_edit':
                     // insert or update a thematic
-                    if (strtoupper($_SERVER['REQUEST_METHOD']) == "POST") {
-                        if (trim($_POST['title']) !== '') {
+                    if ("POST" == strtoupper($_SERVER['REQUEST_METHOD'])) {
+                        if ('' !== trim($_POST['title'])) {
                             if (api_is_allowed_to_edit(null, true)) {
                                 $id = isset($_POST['thematic_id']) ? $_POST['thematic_id'] : null;
                                 $title = trim($_POST['title']);
@@ -59,7 +57,7 @@ class ThematicController
                                 $session_id = api_get_session_id();
                                 $thematic->set_thematic_attributes($id, $title, $content, $session_id);
                                 $last_id = $thematic->thematic_save();
-                                if ($_POST['action'] == 'thematic_add') {
+                                if ('thematic_add' == $_POST['action']) {
                                     $action = 'thematic_details';
                                     $thematic_id = null;
                                     if ($last_id) {
@@ -92,7 +90,7 @@ class ThematicController
                     break;
                 case 'thematic_delete_select':
                     // Delete many thematics
-                    if (strtoupper($_SERVER['REQUEST_METHOD']) == "POST") {
+                    if ("POST" == strtoupper($_SERVER['REQUEST_METHOD'])) {
                         if (api_is_allowed_to_edit(null, true)) {
                             $thematic_ids = $_POST['id'];
                             $thematic->delete($thematic_ids);
@@ -237,13 +235,13 @@ class ThematicController
                     $view->assign('data', $listFinish);
                     $template = $view->get_template('course_progress/pdf_general_thematic.tpl');
 
-                    $format = $pdfOrientation !== 'portrait' ? 'A4-L' : 'A4-P';
-                    $orientation = $pdfOrientation !== 'portrait' ? 'L' : 'P';
+                    $format = 'portrait' !== $pdfOrientation ? 'A4-L' : 'A4-P';
+                    $orientation = 'portrait' !== $pdfOrientation ? 'L' : 'P';
                     $fileName = get_lang('Thematic').'-'.api_get_local_time();
                     $title = get_lang('Thematic');
                     $signatures = ['Drh', 'Teacher', 'Date'];
 
-                    if ($action === 'export_documents') {
+                    if ('export_documents' === $action) {
                         $pdf = new PDF(
                             $format,
                             $orientation,
@@ -290,13 +288,13 @@ class ThematicController
                     $template = $view->get_template('course_progress/pdf_single_thematic.tpl');
 
                     $pdfOrientation = api_get_configuration_value('thematic_pdf_orientation');
-                    $format = $pdfOrientation !== 'portrait' ? 'A4-L' : 'A4-P';
-                    $orientation = $pdfOrientation !== 'portrait' ? 'L' : 'P';
+                    $format = 'portrait' !== $pdfOrientation ? 'A4-L' : 'A4-P';
+                    $orientation = 'portrait' !== $pdfOrientation ? 'L' : 'P';
                     $title = get_lang('Thematic').'-'.$theme['title'];
                     $fileName = $title.'-'.api_get_local_time();
                     $signatures = ['Drh', 'Teacher', 'Date'];
 
-                    if ($action === 'export_single_documents') {
+                    if ('export_single_documents' === $action) {
                         $pdf = new PDF(
                             $format,
                             $orientation,
@@ -348,7 +346,7 @@ class ThematicController
             $data['thematic_id'] = $thematic_id;
         }
 
-        if ($action == 'thematic_details') {
+        if ('thematic_details' == $action) {
             if (isset($thematic_id)) {
                 $thematic_data_result = $thematic->get_thematic_list($thematic_id);
                 if (!empty($thematic_data_result)) {
@@ -397,9 +395,9 @@ class ThematicController
     {
         $thematic = new Thematic();
         $data = [];
-        if (strtoupper($_SERVER['REQUEST_METHOD']) == "POST") {
+        if ("POST" == strtoupper($_SERVER['REQUEST_METHOD'])) {
             if (isset($_POST['action']) &&
-                ($_POST['action'] == 'thematic_plan_add' || $_POST['action'] == 'thematic_plan_edit')
+                ('thematic_plan_add' == $_POST['action'] || 'thematic_plan_edit' == $_POST['action'])
             ) {
                 if (isset($_POST['title'])) {
                     $token = Session::read('thematic_plan_token');
@@ -470,13 +468,13 @@ class ThematicController
         }
 
         $thematic_id = intval($_GET['thematic_id']);
-        if ($action == 'thematic_plan_list') {
+        if ('thematic_plan_list' == $action) {
             $data['thematic_plan_data'] = $thematic->get_thematic_plan_data($thematic_id);
         }
 
         $description_type = isset($_GET['description_type']) ? intval($_GET['description_type']) : null;
         if (!empty($thematic_id) && !empty($description_type)) {
-            if ($action === 'thematic_plan_delete') {
+            if ('thematic_plan_delete' === $action) {
                 if (api_is_allowed_to_edit(null, true)) {
                     $thematic->thematic_plan_destroy(
                         $thematic_id,
@@ -490,7 +488,7 @@ class ThematicController
             }
             $data['thematic_id'] = $thematic_id;
             $data['description_type'] = $description_type;
-        } elseif (!empty($thematic_id) && $action === 'thematic_plan_list') {
+        } elseif (!empty($thematic_id) && 'thematic_plan_list' === $action) {
             $data['thematic_plan_data'] = $thematic->get_thematic_plan_data($thematic_id);
             $data['thematic_id'] = $thematic_id;
         }
@@ -522,7 +520,7 @@ class ThematicController
         $thematic = new Thematic();
         $attendance = new Attendance();
         $data = [];
-        $displayHeader = !empty($_REQUEST['display']) && $_REQUEST['display'] === 'no_header' ? false : true;
+        $displayHeader = !empty($_REQUEST['display']) && 'no_header' === $_REQUEST['display'] ? false : true;
 
         // get data for attendance input select
         $attendance_list = $attendance->get_attendances_list();
diff --git a/public/main/course_progress/thematic_plan.php b/public/main/course_progress/thematic_plan.php
index 292485a5ee..23e1a60207 100644
--- a/public/main/course_progress/thematic_plan.php
+++ b/public/main/course_progress/thematic_plan.php
@@ -7,8 +7,6 @@ use ChamiloSession as Session;
  * View (MVC patter) for thematic plan.
  *
  * @author Christian Fasanando <christian1827@gmail.com>
- *
- * @package chamilo.course_progress
  */
 $tpl = new Template(get_lang('Thematic control'));
 $toolbar = null;
@@ -33,11 +31,11 @@ if (!empty($thematic_simple_list)) {
     }
 }
 
-if (isset($message) && $message == 'ok') {
+if (isset($message) && 'ok' == $message) {
     echo Display::return_message(get_lang('Thematic section has been created successfully'), 'normal');
 }
 
-if ($action === 'thematic_plan_list') {
+if ('thematic_plan_list' === $action) {
     $token = Security::get_token();
 
     Session::write('thematic_plan_token', $token);
@@ -101,7 +99,7 @@ if ($action === 'thematic_plan_list') {
         $form->addButtonSave(get_lang('Save'), 'submit', true),
     ]);
     $formLayout = $form->returnForm();
-} elseif ($action == 'thematic_plan_add' || $action == 'thematic_plan_edit') {
+} elseif ('thematic_plan_add' == $action || 'thematic_plan_edit' == $action) {
     if ($description_type >= ADD_THEMATIC_PLAN) {
         $header_form = get_lang('Other');
     } else {
diff --git a/public/main/coursecopy/copy_course.php b/public/main/coursecopy/copy_course.php
index ae80ef5986..a88eec9595 100644
--- a/public/main/coursecopy/copy_course.php
+++ b/public/main/coursecopy/copy_course.php
@@ -7,8 +7,6 @@ use Chamilo\CourseBundle\Component\CourseCopy\CourseSelectForm;
 
 /**
  * @todo rework file in order to use addFlash
- *
- * @package chamilo.backup
  */
 
 // Setting the global file that gets the general configuration, the databases, the languages, ...
@@ -39,13 +37,13 @@ $action = isset($_POST['action']) ? $_POST['action'] : '';
 
 // If a CourseSelectForm is posted or we should copy all resources, then copy them
 if (Security::check_token('post') && (
-    ($action === 'course_select_form') ||
-    (isset($_POST['copy_option']) && $_POST['copy_option'] === 'full_copy')
+    ('course_select_form' === $action) ||
+    (isset($_POST['copy_option']) && 'full_copy' === $_POST['copy_option'])
     )
 ) {
     // Clear token
     Security::clear_token();
-    if ($action === 'course_select_form') {
+    if ('course_select_form' === $action) {
         $course = CourseSelectForm::get_posted_course('copy_course');
     } else {
         $cb = new CourseBuilder();
@@ -63,7 +61,7 @@ if (Security::check_token('post') && (
     );
 } elseif (Security::check_token('post') && (
         isset($_POST['copy_option']) &&
-        $_POST['copy_option'] === 'select_items'
+        'select_items' === $_POST['copy_option']
     )
 ) {
     // Clear token
diff --git a/public/main/coursecopy/copy_course_session.php b/public/main/coursecopy/copy_course_session.php
index 412d6ab214..4ca391e34f 100644
--- a/public/main/coursecopy/copy_course_session.php
+++ b/public/main/coursecopy/copy_course_session.php
@@ -11,8 +11,6 @@ use ChamiloSession as Session;
  *
  * @author Christian Fasanando
  * @author Julio Montoya <gugli100@gmail.com> Lots of bug fixes/improvements
- *
- * @package chamilo.backup
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -62,7 +60,7 @@ function make_select_session_list($name, $sessions, $attr = [])
     }
     $output = '<select id="session" class="form-control" name="'.$name.'" '.$attributes.'>';
 
-    if (count($sessions) == 0) {
+    if (0 == count($sessions)) {
         $output .= '<option value = "0">'.get_lang('There are no sessions available').'</option>';
     } else {
         $output .= '<option value = "0">'.get_lang('Select a session').'</option>';
@@ -164,7 +162,7 @@ function search_courses($id_session, $type)
 
     if (!empty($type)) {
         $id_session = (int) $id_session;
-        if ($type == 'origin') {
+        if ('origin' == $type) {
             $course_list = SessionManager::get_course_list_by_session_id($id_session);
             $temp_course_list = [];
             $return .= '<select id="origin" name="SessionCoursesListOrigin[]" class="form-control" onclick="javascript: checkSelected(this.id,\'copy_option_2\',\'title_option2\',\'destination\');">';
@@ -279,16 +277,16 @@ if (isset($_POST['copy_only_session_items']) && $_POST['copy_only_session_items'
 
 /*  MAIN CODE  */
 if (Security::check_token('post') && (
-        ($action === 'course_select_form') || (
+        ('course_select_form' === $action) || (
             isset($_POST['copy_option']) &&
-            $_POST['copy_option'] == 'full_copy'
+            'full_copy' == $_POST['copy_option']
         )
     )
 ) {
     // Clear token
     Security::clear_token();
     $destination_course = $origin_course = $destination_session = $origin_session = '';
-    if ($action === 'course_select_form') {
+    if ('course_select_form' === $action) {
         $destination_course = $_POST['destination_course'];
         $origin_course = $_POST['origin_course'];
         $destination_session = $_POST['destination_session'];
@@ -359,14 +357,14 @@ if (Security::check_token('post') && (
     }
 } elseif (Security::check_token('post') && (
         isset($_POST['copy_option']) &&
-        $_POST['copy_option'] == 'select_items'
+        'select_items' == $_POST['copy_option']
     )
 ) {
     // Clear token
     Security::clear_token();
 
     // Else, if a CourseSelectForm is requested, show it
-    if (api_get_setting('show_glossary_in_documents') != 'none') {
+    if ('none' != api_get_setting('show_glossary_in_documents')) {
         echo Display::return_message(get_lang('To export a document that has glossary terms with its references to the glossary, you have to make sure you include the glossary tool in the export'), 'normal');
     }
 
diff --git a/public/main/coursecopy/copy_course_session_selected.php b/public/main/coursecopy/copy_course_session_selected.php
index a56cb9f07f..3bc14eb290 100644
--- a/public/main/coursecopy/copy_course_session_selected.php
+++ b/public/main/coursecopy/copy_course_session_selected.php
@@ -12,8 +12,6 @@ use ChamiloSession as Session;
  * @author Christian Fasanando
  * @author Julio Montoya <gugli100@gmail.com> Lots of bug fixes/improvements
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com> Code conventions
- *
- * @package chamilo.backup
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -72,7 +70,7 @@ function make_select_session_list($name, $sessions, $attr = [])
     }
     $output = '<select name="'.$name.'" '.$attrs.'>';
 
-    if (count($sessions) == 0) {
+    if (0 == count($sessions)) {
         $output .= '<option value = "0">'.get_lang(
                 'ThereIsNotStillASession'
             ).'</option>';
@@ -280,14 +278,14 @@ Display::display_header($nameTools);
 
 /* MAIN CODE */
 
-if (($action === 'course_select_form') ||
-    (isset($_POST['copy_option']) && $_POST['copy_option'] == 'full_copy')
+if (('course_select_form' === $action) ||
+    (isset($_POST['copy_option']) && 'full_copy' == $_POST['copy_option'])
 ) {
     $destinationCourse = $destinationSession = '';
     $originCourse = api_get_course_id();
     $originSession = api_get_session_id();
 
-    if ($action === 'course_select_form') {
+    if ('course_select_form' === $action) {
         $destinationCourse = $_POST['destination_course'];
         $destinationSession = $_POST['destination_session'];
         $course = CourseSelectForm::get_posted_course(
@@ -350,9 +348,9 @@ if (($action === 'course_select_form') ||
             displayForm();
         }
     }
-} elseif (isset($_POST['copy_option']) && $_POST['copy_option'] == 'select_items') {
+} elseif (isset($_POST['copy_option']) && 'select_items' == $_POST['copy_option']) {
     // Else, if a CourseSelectForm is requested, show it
-    if (api_get_setting('show_glossary_in_documents') != 'none') {
+    if ('none' != api_get_setting('show_glossary_in_documents')) {
         echo Display::return_message(
             get_lang('To export a document that has glossary terms with its references to the glossary, you have to make sure you include the glossary tool in the export'),
             'normal'
diff --git a/public/main/coursecopy/create_backup.php b/public/main/coursecopy/create_backup.php
index 71e4cd10c8..8d59adb1a6 100644
--- a/public/main/coursecopy/create_backup.php
+++ b/public/main/coursecopy/create_backup.php
@@ -9,8 +9,6 @@ use Chamilo\CourseBundle\Component\CourseCopy\CourseSelectForm;
  * Create a backup.
  *
  * @author Bart Mollet <bart.mollet@hogent.be>
- *
- * @package chamilo.backup
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_COURSE_MAINTENANCE;
@@ -44,12 +42,12 @@ $action = isset($_POST['action']) ? $_POST['action'] : '';
 $backupOption = isset($_POST['backup_option']) ? $_POST['backup_option'] : '';
 
 if (Security::check_token('post') &&
-    ($action === 'course_select_form' || $backupOption === 'full_backup')
+    ('course_select_form' === $action || 'full_backup' === $backupOption)
 ) {
     // Clear token
     Security::clear_token();
 
-    if ($action === 'course_select_form') {
+    if ('course_select_form' === $action) {
         $cb = new CourseBuilder('partial');
         $course = $cb->build(0, null, false, array_keys($_POST['resource']), $_POST['resource']);
         $course = CourseSelectForm::get_posted_course(null, 0, '', $course);
@@ -65,7 +63,7 @@ if (Security::check_token('post') &&
         api_get_path(WEB_CODE_PATH).'course_info/download.php?archive='.$zipFile.'&'.api_get_cidreq(),
         ['class' => 'btn btn-primary btn-large']
     );
-} elseif (Security::check_token('post') && $backupOption === 'select_items') {
+} elseif (Security::check_token('post') && 'select_items' === $backupOption) {
     // Clear token
     Security::clear_token();
     $cb = new CourseBuilder('partial');
diff --git a/public/main/coursecopy/import_backup.php b/public/main/coursecopy/import_backup.php
index 8cc748713b..edfcabf784 100644
--- a/public/main/coursecopy/import_backup.php
+++ b/public/main/coursecopy/import_backup.php
@@ -10,8 +10,6 @@ use ChamiloSession as Session;
  * Import a backup.
  *
  * @author Bart Mollet <bart.mollet@hogent.be>
- *
- * @package chamilo.backup
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -47,24 +45,24 @@ $importOption = isset($_POST['import_option']) ? $_POST['import_option'] : '';
 
 /* MAIN CODE */
 $filename = '';
-if (Security::check_token('post') && ($action === 'course_select_form' || $importOption === 'full_backup')) {
+if (Security::check_token('post') && ('course_select_form' === $action || 'full_backup' === $importOption)) {
     // Clear token
     Security::clear_token();
 
     $error = false;
-    if ($action === 'course_select_form') {
+    if ('course_select_form' === $action) {
         // Partial backup here we recover the documents posted
         $filename = Session::read('backup_file');
         $course = CourseArchiver::readCourse($filename, false);
         $course = CourseSelectForm::get_posted_course(null, null, null, $course);
     } else {
-        if ($_POST['backup_type'] === 'server') {
+        if ('server' === $_POST['backup_type']) {
             $filename = $_POST['backup_server'];
             $delete_file = false;
         } else {
-            if ($_FILES['backup']['error'] == 0) {
+            if (0 == $_FILES['backup']['error']) {
                 $filename = CourseArchiver::importUploadedFile($_FILES['backup']['tmp_name']);
-                if ($filename === false) {
+                if (false === $filename) {
                     $error = true;
                 } else {
                     $delete_file = false;
@@ -92,11 +90,11 @@ if (Security::check_token('post') && ($action === 'course_select_form' || $impor
         if (!$error) {
             echo Display::return_message(get_lang('There are no resources in backup file'), 'warning');
             echo '<a class="btn btn-default" href="import_backup.php?'.api_get_cidreq().'">'.get_lang('Try again').'</a>';
-        } elseif ($filename === false) {
+        } elseif (false === $filename) {
             echo Display::return_message(get_lang('The app/cache/ directory, used by this tool, is not writeable. Please contact your platform administrator.'), 'error');
             echo '<a class="btn btn-default" href="import_backup.php?'.api_get_cidreq().'">'.get_lang('Try again').'</a>';
         } else {
-            if ($filename == '') {
+            if ('' == $filename) {
                 echo Display::return_message(get_lang('Select a backup file'), 'error');
                 echo '<a class="btn btn-default" href="import_backup.php?'.api_get_cidreq().'">'.get_lang('Try again').'</a>';
             } else {
@@ -106,11 +104,11 @@ if (Security::check_token('post') && ($action === 'course_select_form' || $impor
         }
     }
     CourseArchiver::cleanBackupDir();
-} elseif (Security::check_token('post') && $importOption === 'select_items') {
+} elseif (Security::check_token('post') && 'select_items' === $importOption) {
     // Clear token
     Security::clear_token();
 
-    if ($_POST['backup_type'] === 'server') {
+    if ('server' === $_POST['backup_type']) {
         $filename = $_POST['backup_server'];
         $delete_file = false;
     } else {
@@ -120,12 +118,12 @@ if (Security::check_token('post') && ($action === 'course_select_form' || $impor
     }
     $course = CourseArchiver::readCourse($filename, $delete_file);
 
-    if ($course->has_resources() && $filename !== false) {
+    if ($course->has_resources() && false !== $filename) {
         $hiddenFields['same_file_name_option'] = $_POST['same_file_name_option'];
         // Add token to Course select form
         $hiddenFields['sec_token'] = Security::get_token();
         CourseSelectForm::display_form($course, $hiddenFields);
-    } elseif ($filename === false) {
+    } elseif (false === $filename) {
         echo Display::return_message(get_lang('The app/cache/ directory, used by this tool, is not writeable. Please contact your platform administrator.'), 'error');
         echo '<a class="btn btn-default" href="import_backup.php?'.api_get_cidreq().'">'.get_lang('Try again').'</a>';
     } else {
diff --git a/public/main/coursecopy/import_moodle.php b/public/main/coursecopy/import_moodle.php
index 0a992ff1d2..d6858e3c06 100644
--- a/public/main/coursecopy/import_moodle.php
+++ b/public/main/coursecopy/import_moodle.php
@@ -5,8 +5,6 @@
  * Import a backup from moodle system.
  *
  * @author José Loguercio <jose.loguercio@beeznest.com>
- *
- * @package chamilo.backup
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/coursecopy/recycle_course.php b/public/main/coursecopy/recycle_course.php
index 44f205b95b..25130e74d4 100644
--- a/public/main/coursecopy/recycle_course.php
+++ b/public/main/coursecopy/recycle_course.php
@@ -9,8 +9,6 @@ use Chamilo\CourseBundle\Component\CourseCopy\CourseSelectForm;
  * Delete resources from a course.
  *
  * @author Bart Mollet <bart.mollet@hogent.be>
- *
- * @package chamilo.backup
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_COURSE_MAINTENANCE;
@@ -39,25 +37,25 @@ echo Display::page_header($nameTools);
 $action = isset($_POST['action']) ? $_POST['action'] : '';
 
 if (Security::check_token('post') && (
-        $action === 'course_select_form' ||
+        'course_select_form' === $action ||
         (
             isset($_POST['recycle_option']) &&
-            $_POST['recycle_option'] == 'full_backup'
+            'full_backup' == $_POST['recycle_option']
         )
     )
 ) {
     // Clear token
     Security::clear_token();
-    if (isset($_POST['action']) && $_POST['action'] === 'course_select_form') {
+    if (isset($_POST['action']) && 'course_select_form' === $_POST['action']) {
         $course = CourseSelectForm::get_posted_course();
     } else {
         $cb = new CourseBuilder();
         $course = $cb->build();
     }
     $recycle_type = '';
-    if (isset($_POST['recycle_option']) && $_POST['recycle_option'] === 'full_backup') {
+    if (isset($_POST['recycle_option']) && 'full_backup' === $_POST['recycle_option']) {
         $recycle_type = 'full_backup';
-    } elseif (isset($_POST['action']) && $_POST['action'] === 'course_select_form') {
+    } elseif (isset($_POST['action']) && 'course_select_form' === $_POST['action']) {
         $recycle_type = 'select_items';
     }
     $cr = new CourseRecycler($course);
@@ -65,7 +63,7 @@ if (Security::check_token('post') && (
     echo Display::return_message(get_lang('Recycle is finished'), 'confirm');
 } elseif (Security::check_token('post') && (
         isset($_POST['recycle_option']) &&
-        $_POST['recycle_option'] === 'select_items'
+        'select_items' === $_POST['recycle_option']
     )
 ) {
     // Clear token
diff --git a/public/main/cron/add_gradebook_certificates.php b/public/main/cron/add_gradebook_certificates.php
index 7d0445f995..06637bc24a 100644
--- a/public/main/cron/add_gradebook_certificates.php
+++ b/public/main/cron/add_gradebook_certificates.php
@@ -5,8 +5,6 @@
  * Adds gradebook certificates to gradebook_certificate table from users
  * who have achieved the requirements but have not reviewed them yet.
  *
- * @package chamilo.cron
- *
  * @author Imanol Losada <imanol.losada@beeznest.com>
  */
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/cron/course_finished.php b/public/main/cron/course_finished.php
index b55e54f4bc..077fdb3a52 100644
--- a/public/main/cron/course_finished.php
+++ b/public/main/cron/course_finished.php
@@ -5,16 +5,14 @@
  * Cron for send a email when the course are finished.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.cron
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
-if (php_sapi_name() != 'cli') {
+if ('cli' != php_sapi_name()) {
     exit; //do not run from browser
 }
 
-$isActive = api_get_setting('cron_remind_course_expiration_activate') === 'true';
+$isActive = 'true' === api_get_setting('cron_remind_course_expiration_activate');
 
 if (!$isActive) {
     exit;
diff --git a/public/main/cron/create_course_sessions.php b/public/main/cron/create_course_sessions.php
index cf60f2b467..ae2613afe7 100644
--- a/public/main/cron/create_course_sessions.php
+++ b/public/main/cron/create_course_sessions.php
@@ -4,15 +4,13 @@
  * Create course sessions procedure. It creates sessions for courses that haven't it yet.
  * If today is greater than OFFSET, it will create them also for the next quarter.
  *
- * @package chamilo.cron
- *
  * @author Imanol Losada <imanol.losada@beeznest.com>
  */
 
 /**
  * Initialization.
  */
-if (php_sapi_name() != 'cli') {
+if ('cli' != php_sapi_name()) {
     exit; //do not run from browser
 }
 
@@ -67,7 +65,7 @@ function getQuarter($month)
 {
     $quarter = 1;
     // Remove the leading 0 if any
-    if (substr($month, 0, 1) == '0') {
+    if ('0' == substr($month, 0, 1)) {
         $month = substr($month, 1);
     }
     // reduce to 4 quarters: 1..3=1; 4..6=2
diff --git a/public/main/cron/fix_fill_blank.php b/public/main/cron/fix_fill_blank.php
index 9349e057e5..b12477527f 100644
--- a/public/main/cron/fix_fill_blank.php
+++ b/public/main/cron/fix_fill_blank.php
@@ -58,7 +58,7 @@ while ($row = Database::fetch_array($res2)) {
              WHERE id = $id AND c_id = $courseId AND id_auto  = $idAuto ";
 
     if ($answerOriginal != $answerFixedNotEscape) {
-        if (!empty($execute) && $execute == 1) {
+        if (!empty($execute) && 1 == $execute) {
             Database::query($sql4);
             echo '<pre>';
             var_dump($sql4);
diff --git a/public/main/cron/fix_online_time.php b/public/main/cron/fix_online_time.php
index 1f336f1bfc..24585aff3c 100644
--- a/public/main/cron/fix_online_time.php
+++ b/public/main/cron/fix_online_time.php
@@ -17,14 +17,12 @@
  *
  * Where "5" is the value of the 'STUDENT' constant.
  *
- * @package chamilo.cron
- *
  * @author Imanol Losada <imanol.losada@beeznest.com>
  * @author Julio Montoya
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
-if (php_sapi_name() != 'cli') {
+if ('cli' != php_sapi_name()) {
     exit; //do not run from browser
 }
 
diff --git a/public/main/cron/import_csv.php b/public/main/cron/import_csv.php
index 2e2b1f4229..b086cc290d 100644
--- a/public/main/cron/import_csv.php
+++ b/public/main/cron/import_csv.php
@@ -130,7 +130,7 @@ class ImportCsv
         if (!empty($files)) {
             foreach ($files as $file) {
                 $fileInfo = pathinfo($file);
-                if (isset($fileInfo['extension']) && $fileInfo['extension'] === 'csv') {
+                if (isset($fileInfo['extension']) && 'csv' === $fileInfo['extension']) {
                     // Checking teachers_yyyymmdd.csv,
                     // courses_yyyymmdd.csv, students_yyyymmdd.csv and sessions_yyyymmdd.csv
                     $parts = explode('_', $fileInfo['filename']);
@@ -140,37 +140,37 @@ class ImportCsv
 
                     $isStatic = strpos($method, 'Static');
 
-                    if ($method == 'importSessionsextidStatic') {
+                    if ('importSessionsextidStatic' == $method) {
                         $method = 'importSessionsExtIdStatic';
                     }
 
-                    if ($method == 'importCourseinsertStatic') {
+                    if ('importCourseinsertStatic' == $method) {
                         $method = 'importSubscribeUserToCourse';
                     }
 
-                    if ($method == 'importUnsubsessionsextidStatic') {
+                    if ('importUnsubsessionsextidStatic' == $method) {
                         $method = 'importUnsubsessionsExtidStatic';
                     }
 
-                    if ($method == 'importCareersdiagram') {
+                    if ('importCareersdiagram' == $method) {
                         $method = 'importCareersDiagram';
                     }
 
-                    if ($method == 'importCareersresults') {
+                    if ('importCareersresults' == $method) {
                         $method = 'importCareersResults';
                     }
 
-                    if ($method == 'importOpensessions') {
+                    if ('importOpensessions' == $method) {
                         $method = 'importOpenSessions';
                     }
 
-                    if ($method == 'importSubsessionsextidStatic') {
+                    if ('importSubsessionsextidStatic' == $method) {
                         $method = 'importSubscribeUserToCourseSessionExtStatic';
                     }
                     if (method_exists($this, $method)) {
                         if ((
-                                $method == 'importSubscribeStatic' ||
-                                $method == 'importSubscribeUserToCourse'
+                                'importSubscribeStatic' == $method ||
+                                'importSubscribeUserToCourse' == $method
                             ) ||
                             empty($isStatic)
                         ) {
@@ -230,7 +230,7 @@ class ImportCsv
                         $this->logger->addInfo('====================================================');
                         $this->logger->addInfo("Reading file: $file");
                         $this->logger->addInfo("Loading method $method ");
-                        if ($method == 'importSessions' || $method == 'importOpenSessions') {
+                        if ('importSessions' == $method || 'importOpenSessions' == $method) {
                             $this->$method(
                                 $file,
                                 true,
@@ -404,7 +404,7 @@ class ImportCsv
 
                 $this->logger->addInfo("Post id saved #".$post->getId());
 
-                if (($counter % $batchSize) === 0) {
+                if (0 === ($counter % $batchSize)) {
                     $em->flush();
                     $em->clear(); // Detaches all objects from Doctrine!
                 }
@@ -436,7 +436,7 @@ class ImportCsv
      */
     public function updateUsersEmails()
     {
-        if ($this->getUpdateEmailToDummy() === true) {
+        if (true === $this->getUpdateEmailToDummy()) {
             $sql = "UPDATE user SET email = CONCAT(username,'@example.com') WHERE id NOT IN (SELECT user_id FROM admin)";
             Database::query($sql);
         }
@@ -690,7 +690,7 @@ class ImportCsv
 
                     if ($userId) {
                         foreach ($row as $key => $value) {
-                            if (substr($key, 0, 6) == 'extra_') {
+                            if ('extra_' == substr($key, 0, 6)) {
                                 //an extra field
                                 UserManager::update_extra_field_value(
                                     $userId,
@@ -737,7 +737,7 @@ class ImportCsv
 
                     if ($result) {
                         foreach ($row as $key => $value) {
-                            if (substr($key, 0, 6) == 'extra_') {
+                            if ('extra_' == substr($key, 0, 6)) {
                                 //an extra field
                                 UserManager::update_extra_field_value(
                                     $userInfo['user_id'],
@@ -752,7 +752,7 @@ class ImportCsv
                     }
                 }
 
-                if (($counter % $batchSize) === 0) {
+                if (0 === ($counter % $batchSize)) {
                     $em->flush();
                     $em->clear(); // Detaches all objects from Doctrine!
                 }
@@ -889,7 +889,7 @@ class ImportCsv
 
                     if ($result) {
                         foreach ($row as $key => $value) {
-                            if (substr($key, 0, 6) === 'extra_') {
+                            if ('extra_' === substr($key, 0, 6)) {
                                 //an extra field
                                 UserManager::update_extra_field_value(
                                     $result,
@@ -910,7 +910,7 @@ class ImportCsv
                         continue;
                     }
 
-                    if (isset($row['action']) && $row['action'] === 'delete') {
+                    if (isset($row['action']) && 'delete' === $row['action']) {
                         // Inactive one year later
                         $userInfo['expiration_date'] = api_get_utc_datetime(api_strtotime(time() + $secondsInYear));
                     }
@@ -999,7 +999,7 @@ class ImportCsv
                             $this->logger->addInfo("Students - Username was changes from '".$userInfo['username']."' to '".$row['username']."' ");
                         }
                         foreach ($row as $key => $value) {
-                            if (substr($key, 0, 6) === 'extra_') {
+                            if ('extra_' === substr($key, 0, 6)) {
                                 //an extra field
                                 UserManager::update_extra_field_value(
                                     $userInfo['user_id'],
@@ -1014,7 +1014,7 @@ class ImportCsv
                     }
                 }
 
-                if (($counter % $batchSize) === 0) {
+                if (0 === ($counter % $batchSize)) {
                     $em->flush();
                     $em->clear(); // Detaches all objects from Doctrine!
                     $this->logger->addInfo("Detaches all objects");
@@ -1085,7 +1085,7 @@ class ImportCsv
                     'disable_import_calendar'
                 );
 
-                if (!empty($item) && isset($item['value']) && $item['value'] == 1) {
+                if (!empty($item) && isset($item['value']) && 1 == $item['value']) {
                     $this->logger->addInfo(
                         "Course '".$courseInfo['code']."' has 'disable_import_calendar' turn on. Skip"
                     );
@@ -1095,7 +1095,7 @@ class ImportCsv
                 if (empty($courseInfo)) {
                     $this->logger->addInfo("Course '$courseCode' does not exists");
                 } else {
-                    if ($courseInfo['visibility'] == COURSE_VISIBILITY_HIDDEN) {
+                    if (COURSE_VISIBILITY_HIDDEN == $courseInfo['visibility']) {
                         $this->logger->addInfo("Course '".$courseInfo['code']."' has hidden visiblity. Skip");
                         $errorFound = true;
                     }
@@ -1113,7 +1113,7 @@ class ImportCsv
                         $courseInfo['real_id']
                     );
 
-                    if ($courseIncluded == false) {
+                    if (false == $courseIncluded) {
                         $this->logger->addInfo(
                             "Course '$courseCode' is not included in session: $sessionId"
                         );
@@ -1177,7 +1177,7 @@ class ImportCsv
                     }
                 }
 
-                if ($errorFound == false) {
+                if (false == $errorFound) {
                     $eventsToCreate[] = [
                         'start' => $startDate,
                         'end' => $endDate,
@@ -1410,7 +1410,7 @@ class ImportCsv
                 }
 
                 // Send announcement to users
-                if ($sendMail && $alreadyAdded == false) {
+                if ($sendMail && false == $alreadyAdded) {
                     $start = $firstDate;
                     $end = $firstEndDate;
 
@@ -1442,7 +1442,7 @@ class ImportCsv
                         'careerid'
                     );
                     $externalCareerIdList = $externalCareerIdList['value'];
-                    if (substr($externalCareerIdList, 0, 1) === '[') {
+                    if ('[' === substr($externalCareerIdList, 0, 1)) {
                         $externalCareerIdList = substr($externalCareerIdList, 1, -1);
                         $externalCareerIds = preg_split('/,/', $externalCareerIdList);
                     } else {
@@ -1507,7 +1507,7 @@ class ImportCsv
                         1
                     );
 
-                    if (count($announcementsWithTitleList) === 0) {
+                    if (0 === count($announcementsWithTitleList)) {
                         $this->logger->addInfo(
                             'Mail to be sent because start date: '.$event['start'].' and no announcement found.'
                         );
@@ -1562,7 +1562,7 @@ class ImportCsv
                     $this->logger->addInfo(
                         "Send Mail: ".intval($sendMail).' - Already added: '.intval($alreadyAdded)
                     );
-                    if ($sendMail == false) {
+                    if (false == $sendMail) {
                         $report['mail_not_sent_because_date']++;
                     }
                 }
@@ -1630,7 +1630,7 @@ class ImportCsv
                             $this->defaultAdminId
                         );
 
-                        if ($eventResult !== false) {
+                        if (false !== $eventResult) {
                             $this->logger->addInfo(
                                 "Event updated #".$item['item_id']." External cal Id: (".$externalEventId.") $info"
                             );
@@ -1675,7 +1675,7 @@ class ImportCsv
                     }
                 }
 
-                if (($counter % $batchSize) === 0) {
+                if (0 === ($counter % $batchSize)) {
                     $em->flush();
                     $em->clear(); // Detaches all objects from Doctrine!
                 }
@@ -2267,7 +2267,7 @@ class ImportCsv
                                     $courseCoachId = UserManager::get_user_id_from_username(
                                         $courseCoach
                                     );
-                                    if ($courseCoachId !== false) {
+                                    if (false !== $courseCoachId) {
                                         // Just insert new coaches
                                         $coachList[] = $courseCoachId;
                                     }
@@ -2709,7 +2709,7 @@ class ImportCsv
                     }
                 }
 
-                if (UserManager::userHasCareer($studentId, $careerChamiloId) === false) {
+                if (false === UserManager::userHasCareer($studentId, $careerChamiloId)) {
                     $this->logger->addInfo(
                         "User $studentId (".$row['StudentId'].") has no career #$careerChamiloId (ext #$careerId)"
                     );
@@ -3195,7 +3195,7 @@ if (isset($argv[1]) && $argv[1] = '--dump') {
 }
 
 if (isset($_configuration['import_csv_disable_dump']) &&
-    $_configuration['import_csv_disable_dump'] == true
+    true == $_configuration['import_csv_disable_dump']
 ) {
     $import->setDumpValues(false);
 } else {
@@ -3231,7 +3231,7 @@ $executionTime = round(($timeEnd - $timeStart) / 60, 2);
 $logger->addInfo("Total execution Time $executionTime Min");
 
 if (isset($_configuration['import_csv_fix_permissions']) &&
-    $_configuration['import_csv_fix_permissions'] == true
+    true == $_configuration['import_csv_fix_permissions']
 ) {
     $command = "sudo find ".api_get_path(SYS_COURSE_PATH)." -type d -exec chmod 777 {} \; ";
     echo "Executing: ".$command.PHP_EOL;
diff --git a/public/main/cron/lang/check_parse_lang.php b/public/main/cron/lang/check_parse_lang.php
index af27d451e1..1f7d58e201 100644
--- a/public/main/cron/lang/check_parse_lang.php
+++ b/public/main/cron/lang/check_parse_lang.php
@@ -1,8 +1,6 @@
 <?php /* For licensing terms, see /license.txt */
 /**
  * Script to check that no language file has parse errors.
- *
- * @package chamilo.cron.lang
  */
 /**
  * Includes and declarations.
@@ -19,7 +17,7 @@ $list = SubLanguageManager::get_lang_folder_files_list($path);
 $langs = scandir(api_get_path(SYS_LANG_PATH));
 foreach ($langs as $lang) {
     $dir = api_get_path(SYS_LANG_PATH).$lang;
-    if (is_dir($dir) && substr($lang, 0, 1) != '.' && !empty($lang)) {
+    if (is_dir($dir) && '.' != substr($lang, 0, 1) && !empty($lang)) {
         echo "$lang...";
         $ok = true;
         foreach ($list as $entry) {
@@ -28,7 +26,7 @@ foreach ($langs as $lang) {
             if (is_file($file)) {
                 //$terms = array_merge($terms,SubLanguageManager::get_all_language_variable_in_file($file,true));
                 @exec('php -l '.$file, $out);
-                if (substr($out[0], 0, 2) != 'No') {
+                if ('No' != substr($out[0], 0, 2)) {
                     echo $out[0]."\n";
                     $ok = false;
                 }
diff --git a/public/main/cron/lang/langstats.class.php b/public/main/cron/lang/langstats.class.php
index 60c630d125..a24f64133c 100644
--- a/public/main/cron/lang/langstats.class.php
+++ b/public/main/cron/lang/langstats.class.php
@@ -5,8 +5,6 @@
  * This class takes the creation and querying of an SQLite DB in charge. The
  * goal of this DB is to get stats on the usage of language vars for a common
  * user.
- *
- * @package chamilo.cron.lang
  */
 
 /**
@@ -50,7 +48,7 @@ class langstats
                         .' id integer PRIMARY KEY AUTOINCREMENT, ' //autoincrement in SQLITE
                         .' term_name text, term_file text, term_count integer default 0)'
                     );
-                    if ($err === false) {
+                    if (false === $err) {
                         $this->error = 'CouldNotCreateTable';
 
                         return false;
@@ -58,7 +56,7 @@ class langstats
                     $err = $this->db->exec(
                         'CREATE INDEX lang_freq_terms_idx ON lang_freq(term_name, term_file)'
                     );
-                    if ($err === false) {
+                    if (false === $err) {
                         $this->error = 'CouldNotCreateIndex';
 
                         return false;
@@ -73,13 +71,13 @@ class langstats
                     return false; //cannot use if sqlite not installed
                 }
                 $err = Database::query('SELECT * FROM lang_freq');
-                if ($err === false) { //the database probably does not exist, create it
+                if (false === $err) { //the database probably does not exist, create it
                     $err = Database::query(
                         'CREATE TABLE lang_freq ('
                         .' id int PRIMARY KEY AUTO_INCREMENT, '
                         .' term_name text, term_file text default \'\', term_count int default 0)'
                     );
-                    if ($err === false) {
+                    if (false === $err) {
                         $this->error = 'CouldNotCreateTable';
 
                         return false;
@@ -105,7 +103,7 @@ class langstats
         $term_file = $this->db->escapeString($term_file);
         $sql = "SELECT id, term_name, term_file, term_count FROM lang_freq WHERE term_name='$term' and term_file='$term_file'";
         $ress = $this->db->query($sql);
-        if ($ress === false) {
+        if (false === $ress) {
             $this->error = 'CouldNotQueryTermFromTable';
 
             return false;
@@ -118,7 +116,7 @@ class langstats
             $res = $this->db->query(
                 'UPDATE lang_freq SET term_count = '.$num.' WHERE id = '.$row[0]
             );
-            if ($res === false) {
+            if (false === $res) {
                 $this->error = 'CouldNotUpdateTerm';
 
                 return false;
@@ -126,12 +124,12 @@ class langstats
                 return $row[0];
             }
         }
-        if ($i == 0) {
+        if (0 == $i) {
             //No term found in the table, register as new term
             $resi = $this->db->query(
                 "INSERT INTO lang_freq(term_name, term_file, term_count) VALUES ('$term', '$term_file', 1)"
             );
-            if ($resi === false) {
+            if (false === $resi) {
                 $this->error = 'CouldNotInsertRow';
 
                 return false;
@@ -198,7 +196,7 @@ class langstats
         }
         $files = scandir($path);
         foreach ($files as $file) {
-            if (substr($file, 0, 1) == '.' or in_array($file, $priority)) {
+            if ('.' == substr($file, 0, 1) or in_array($file, $priority)) {
                 continue;
             }
             $list = SubLanguageManager::get_all_language_variable_in_file(
diff --git a/public/main/cron/lang/langstats.php b/public/main/cron/lang/langstats.php
index 36b02c300d..1b7eaac568 100644
--- a/public/main/cron/lang/langstats.php
+++ b/public/main/cron/lang/langstats.php
@@ -21,18 +21,18 @@ $terms_limit = 10000 + 50;
 $x_most_popular = 2000;
 $output = false;
 $ls = new langstats();
-if ($ls === false) {
+if (false === $ls) {
     exit($ls->error);
 }
 $list = $ls->get_popular_terms($x_most_popular);
-if ($_GET['output'] == 1) {
+if (1 == $_GET['output']) {
     $output = true;
     $variables_origin = $ls->get_variables_origin();
 }
 /**
  * Display.
  */
-if (count($list) == 0) {
+if (0 == count($list)) {
     echo 'No terms loaded so far';
 }
 if (count($list) > 0) {
@@ -42,7 +42,7 @@ if (count($list) > 0) {
     $files = [];
     $trans = [];
     echo 'Number of records: '.count($list).'<br />';
-    echo '<table><tr><th>Index</th><th>Registration order</th><th>Term</th>'.($output == 1 ? '<th>Origin</th>' : '').'<th>Count</th></tr>';
+    echo '<table><tr><th>Index</th><th>Registration order</th><th>Term</th>'.(1 == $output ? '<th>Origin</th>' : '').'<th>Count</th></tr>';
     foreach ($list as $elem) {
         if ($k > $terms_limit) {
             break;
diff --git a/public/main/cron/lang/langstats_file_builder.php b/public/main/cron/lang/langstats_file_builder.php
index 1616c1252e..c120873bb8 100644
--- a/public/main/cron/lang/langstats_file_builder.php
+++ b/public/main/cron/lang/langstats_file_builder.php
@@ -59,7 +59,7 @@ $words_found = 0;
 $global_var = []; //keep the combination of all vars
 $terms_in_limit = array_flip($terms_in_limit);
 foreach ($list_files as $file) {
-    if (substr($file, 0, 1) == '.') {
+    if ('.' == substr($file, 0, 1)) {
         continue;
     }
     //echo "'".substr($file,0,-8)."',<br />"; //print in a PHP array format
diff --git a/public/main/cron/lang/list_undefined_langvars.php b/public/main/cron/lang/list_undefined_langvars.php
index 35b6dbd4e7..6fbaec4e22 100644
--- a/public/main/cron/lang/list_undefined_langvars.php
+++ b/public/main/cron/lang/list_undefined_langvars.php
@@ -1,8 +1,6 @@
 <?php /* For licensing terms, see /license.txt */
 /**
  * Cron script to list used, but undefined, language variables.
- *
- * @package chamilo.cron
  */
 /**
  * Includes and declarations.
@@ -71,7 +69,7 @@ if (count($undefined_terms) < 1) {
 }
 $i = 1;
 foreach ($undefined_terms as $term => $file) {
-    $isPlugin = substr($file, 0, 7) == 'plugin/';
+    $isPlugin = 'plugin/' == substr($file, 0, 7);
     echo "<tr><td>$i</td><td>$term</td><td>in $file";
     if ($isPlugin) {
         echo " <span style=\"color: #00ff00;\">(this one should be taken care of by the plugin's language files)</span>";
diff --git a/public/main/cron/lang/list_unused_langvars.php b/public/main/cron/lang/list_unused_langvars.php
index 68154b99e5..b6e3683b1c 100644
--- a/public/main/cron/lang/list_unused_langvars.php
+++ b/public/main/cron/lang/list_unused_langvars.php
@@ -1,8 +1,6 @@
 <?php /* For licensing terms, see /license.txt */
 /**
  * Cron script to list unused, but defined, language variables.
- *
- * @package chamilo.cron.lang
  */
 /**
  * Includes and declarations.
@@ -40,7 +38,7 @@ foreach ($files as $file) {
     //echo 'Analyzing '.$shortFile."<br />";
     $lines = file($file);
     $isDataSQL = false;
-    if (substr($file, -21) === 'main/install/data.sql') {
+    if ('main/install/data.sql' === substr($file, -21)) {
         $isDataSQL = true;
     }
     // Browse lines inside file $file
@@ -56,7 +54,7 @@ foreach ($files as $file) {
             $res = preg_match_all('/\'(\w*)\',/', $line, $myTerms);
             if ($res > 0) {
                 foreach ($myTerms[1] as $term) {
-                    if (substr($term, 0, 4) == 'lang') {
+                    if ('lang' == substr($term, 0, 4)) {
                         $term = substr($term, 4);
                     }
                     $usedTerms[$term] = $shortFile;
@@ -67,7 +65,7 @@ foreach ($files as $file) {
             $res = preg_match_all('/get_lang\(\'(\\w*)\'\)/', $line, $myTerms);
             if ($res > 0) {
                 foreach ($myTerms[1] as $term) {
-                    if (substr($term, 0, 4) == 'lang') {
+                    if ('lang' == substr($term, 0, 4)) {
                         $term = substr($term, 4);
                     }
                     $usedTerms[$term] = $shortFile;
@@ -82,7 +80,7 @@ foreach ($files as $file) {
                 $res = preg_match_all('/\{\s*[\'"](\w*)[\'"]\s*\|\s*get_lang\s*(\|\s*\w*(\s*\([\w_\.,\s]*\))?\s*)?\}/', $line, $myTerms);
                 if ($res > 0) {
                     foreach ($myTerms[1] as $term) {
-                        if (substr($term, 0, 4) == 'lang') {
+                        if ('lang' == substr($term, 0, 4)) {
                             $term = substr($term, 4);
                         }
                         $usedTerms[$term] = $shortFile;
@@ -94,7 +92,7 @@ foreach ($files as $file) {
                 $res = preg_match_all('/\{\s*[\w\.]*\([\'"](\w*)[\'"]\s*\|\s*get_lang\s*(,\s*[\w_\.,\s\|\'"]*\s*)?\)\s*\}/', $line, $myTerms);
                 if ($res > 0) {
                     foreach ($myTerms[1] as $term) {
-                        if (substr($term, 0, 4) == 'lang') {
+                        if ('lang' == substr($term, 0, 4)) {
                             $term = substr($term, 4);
                         }
                         $usedTerms[$term] = $shortFile;
@@ -117,7 +115,7 @@ if (count($usedTerms) < 1) {
 $i = 1;
 foreach ($defined_terms as $term => $file) {
     // remove "lang" prefix just in case
-    if (substr($term, 0, 4) == 'lang') {
+    if ('lang' == substr($term, 0, 4)) {
         $term = substr($term, 4);
     }
     if (!isset($usedTerms[$term])) {
diff --git a/public/main/cron/lang/switch_files_to_gettext.php b/public/main/cron/lang/switch_files_to_gettext.php
index 690f404b89..603c83c2d6 100644
--- a/public/main/cron/lang/switch_files_to_gettext.php
+++ b/public/main/cron/lang/switch_files_to_gettext.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Script to switch all PHP files in Chamilo to a more Gettext-like syntax.
- *
- * @package chamilo.cron.lang
  */
 /**
  * Includes and declarations.
@@ -40,7 +38,7 @@ $countFiles = 0;
 $countReplaces = 0;
 // Browse files
 foreach ($files as $file) {
-    if (substr($file, $rootLength, 6) === 'vendor' || substr($file, $rootLength, 3) === 'web') {
+    if ('vendor' === substr($file, $rootLength, 6) || 'web' === substr($file, $rootLength, 3)) {
         continue;
     }
     //echo 'Analyzing '.$file.PHP_EOL;
@@ -54,7 +52,7 @@ foreach ($files as $file) {
         if ($res > 0) {
             foreach ($myTerms[2] as $term) {
                 echo "Found term $term - ".print_r($myTerms, 1).PHP_EOL;
-                if (substr($term, 0, 4) == 'lang') {
+                if ('lang' == substr($term, 0, 4)) {
                     $term = substr($term, 4);
                 }
                 if (!empty($terms[$term])) {
@@ -71,7 +69,7 @@ foreach ($files as $file) {
             if ($res > 0) {
                 foreach ($myTerms[2] as $term) {
                     echo "Found term $term".PHP_EOL;
-                    if (substr($term, 0, 4) == 'lang') {
+                    if ('lang' == substr($term, 0, 4)) {
                         $term = substr($term, 4);
                     }
                     if (!empty($terms[$term])) {
diff --git a/public/main/cron/notification.php b/public/main/cron/notification.php
index dbcbde136b..13137af122 100644
--- a/public/main/cron/notification.php
+++ b/public/main/cron/notification.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 /**
- * @package chamilo.notification
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 if (PHP_SAPI != 'cli') {
diff --git a/public/main/cron/remind_course_expiration.php b/public/main/cron/remind_course_expiration.php
index 92c6a6e652..9af9c4c2a7 100644
--- a/public/main/cron/remind_course_expiration.php
+++ b/public/main/cron/remind_course_expiration.php
@@ -3,8 +3,6 @@
 /**
  * Course expiration reminder.
  *
- * @package chamilo.cron
- *
  * @author Imanol Losada <imanol.losada@beeznest.com>
  */
 require_once __DIR__.'/../inc/global.inc.php';
@@ -12,11 +10,11 @@ require_once __DIR__.'/../inc/global.inc.php';
 /**
  * Initialization.
  */
-if (php_sapi_name() != 'cli') {
+if ('cli' != php_sapi_name()) {
     exit; //do not run from browser
 }
 
-$isActive = api_get_setting('cron_remind_course_expiration_activate') === 'true';
+$isActive = 'true' === api_get_setting('cron_remind_course_expiration_activate');
 
 if (!$isActive) {
     exit;
diff --git a/public/main/cron/run.php b/public/main/cron/run.php
index 2719d28673..c2af608769 100644
--- a/public/main/cron/run.php
+++ b/public/main/cron/run.php
@@ -4,8 +4,6 @@
  * For more information, check the installation guide in the documentation
  * folder.
  * Add your own executable scripts below the inclusion of notification.php.
- *
- * @package chamilo.cron
  */
 /**
  * Settings that will influence the execution of the cron tasks.
diff --git a/public/main/cron/user_import/client.php b/public/main/cron/user_import/client.php
index 843b0c84f1..70c39dc0f3 100644
--- a/public/main/cron/user_import/client.php
+++ b/public/main/cron/user_import/client.php
@@ -9,15 +9,13 @@
  * @uses /main/webservices/user_import/
  *
  * @author Eric Marguin <eric.marguin@dokeos.com>
- *
- * @package chamilo.cron
  */
 /**
  * Global cycle: init, execute, output.
  */
 require_once __DIR__.'/../../inc/global.inc.php';
 // check if this client has been called by php_cli (command line or cron)
-if (php_sapi_name() != 'cli') {
+if ('cli' != php_sapi_name()) {
     echo 'You can\'t call this service through a browser';
     die();
 }
diff --git a/public/main/cron/user_import/get_data_from_mail.php b/public/main/cron/user_import/get_data_from_mail.php
index 8e4fb171bc..6972743e59 100644
--- a/public/main/cron/user_import/get_data_from_mail.php
+++ b/public/main/cron/user_import/get_data_from_mail.php
@@ -3,8 +3,6 @@
  * This script gets users details of a given list of users
  * (given by e-mail) and prints the details in /tmp/list.txt
  * To enable script, prefix the first die(); with //.
- *
- * @package chamilo.cron.user_import
  */
 /**
  * Initialization.
@@ -24,7 +22,7 @@ foreach ($list as $mail) {
     $mail = trim($mail);
     $sql = "SELECT user_id, official_code, firstname, lastname, email FROM $users WHERE email = '$mail'\n";
     $res = Database::query($sql);
-    if (Database::num_rows($res) == 0) {
+    if (0 == Database::num_rows($res)) {
         $string .= 'No encontrado;'.$row['email'];
     } else {
         $row = Database::fetch_assoc($res);
diff --git a/public/main/cron/user_import/resend_email_with_new_password.php b/public/main/cron/user_import/resend_email_with_new_password.php
index 8854b17fa4..04ba205e75 100644
--- a/public/main/cron/user_import/resend_email_with_new_password.php
+++ b/public/main/cron/user_import/resend_email_with_new_password.php
@@ -7,8 +7,6 @@
  * Note that the password generation has been simplified, which
  * means the password below is not really "safe"
  * To enable script, prefix the first die(); with //.
- *
- * @package chamilo.cron.user_import
  */
 /**
  * Initialization.
@@ -34,10 +32,10 @@ foreach ($list as $mail) {
     $sql = "SELECT user_id, official_code, firstname, lastname, email, username, language
             FROM $users WHERE email = '$mail'\n";
     $res = Database::query($sql);
-    if ($res === false) {
+    if (false === $res) {
         echo 'Error in database with email '.$mail."\n";
     }
-    if (Database::num_rows($res) == 0) {
+    if (0 == Database::num_rows($res)) {
         echo '[Error] Email not found in database: '.$row['email']."\n";
     } else {
         $row = Database::fetch_assoc($res);
diff --git a/public/main/dashboard/block.class.php b/public/main/dashboard/block.class.php
index 8760aa4316..84529a5cc9 100644
--- a/public/main/dashboard/block.class.php
+++ b/public/main/dashboard/block.class.php
@@ -7,8 +7,6 @@
  * Parent class for controller Blocks from dashboard plugin.
  *
  * @author Christian Fasanando <christian1827@gmail.com>
- *
- * @package chamilo.dashboard
  */
 class Block
 {
diff --git a/public/main/dashboard/dashboard_controller.php b/public/main/dashboard/dashboard_controller.php
index 8027cb3fe4..78973c1f42 100644
--- a/public/main/dashboard/dashboard_controller.php
+++ b/public/main/dashboard/dashboard_controller.php
@@ -9,8 +9,6 @@
  * @author Christian Fasanando <christian1827@gmail.com>
  *
  * @todo move to main/inc/lib
- *
- * @package chamilo.dashboard
  */
 class DashboardController
 {
@@ -69,7 +67,7 @@ class DashboardController
         $view = isset($_GET['view']) ? $_GET['view'] : 'blocks';
         api_block_anonymous_users();
         $link_blocks_view = $link_list_view = null;
-        if ($view == 'list') {
+        if ('list' == $view) {
             $link_blocks_view = '<a href="'.api_get_self().'?view=blocks">'.
                 Display::return_icon('blocks.png', get_lang('Dashboard blocks'), '', ICON_SIZE_MEDIUM).'</a>';
         } else {
@@ -94,7 +92,7 @@ class DashboardController
         // block dashboard view
         $columns = [];
         $blockList = null;
-        if (isset($view) && $view == 'blocks') {
+        if (isset($view) && 'blocks' == $view) {
             if (isset($blocks) && count($blocks) > 0) {
                 // group content html by number of column
                 if (is_array($blocks)) {
@@ -126,7 +124,7 @@ class DashboardController
      */
     public function store_user_block()
     {
-        if (strtoupper($_SERVER['REQUEST_METHOD']) == "POST") {
+        if ("POST" == strtoupper($_SERVER['REQUEST_METHOD'])) {
             $enabled_blocks = $_POST['enabled_blocks'];
             $columns = $_POST['columns'];
             DashboardManager::store_user_blocks($this->user_id, $enabled_blocks, $columns);
diff --git a/public/main/dashboard/index.php b/public/main/dashboard/index.php
index a7ff14771c..581948d928 100644
--- a/public/main/dashboard/index.php
+++ b/public/main/dashboard/index.php
@@ -8,8 +8,6 @@ use ChamiloSession as Session;
  * the controllers depend on the current action.
  *
  * @author Christian Fasanando <christian1827@gmail.com>
- *
- * @package chamilo.dashboard
  */
 $cidReset = true;
 
diff --git a/public/main/document/add_link.php b/public/main/document/add_link.php
index 9f2d7e71d3..a19357cfc1 100644
--- a/public/main/document/add_link.php
+++ b/public/main/document/add_link.php
@@ -3,8 +3,6 @@
 
 /**
  * This script allows to add cloud file links to the document structure.
- *
- * @package chamilo.document
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -28,7 +26,7 @@ if (empty($document_data)) {
     $document_id = $parent_id = 0;
     $path = '/';
 } else {
-    if ($document_data['filetype'] == 'folder') {
+    if ('folder' == $document_data['filetype']) {
         $document_id = $document_data['id'];
         $path = $document_data['path'].'/';
         $parent_id = DocumentManager::get_document_id(api_get_course_info(), dirname($path));
@@ -65,7 +63,7 @@ if (api_get_group_id()) {
 }
 
 // Group docs can only be uploaded in the group directory
-if ($groupIid != 0 && $path == '/') {
+if (0 != $groupIid && '/' == $path) {
     $path = $group_properties['directory']."/";
 }
 
@@ -78,13 +76,13 @@ $interbreadcrumb[] = [
 // Interbreadcrumb for the current directory root path
 if (empty($document_data['parents'])) {
     // Hack in order to not add the document to the breadcrumb in case it is a link
-    if ($document_data['filetype'] != 'link') {
+    if ('link' != $document_data['filetype']) {
         $interbreadcrumb[] = ['url' => '#', 'name' => $document_data['title']];
     }
 } else {
     foreach ($document_data['parents'] as $document_sub_data) {
         // Hack in order to not add the document to the breadcrumb in case it is a link
-        if ($document_data['filetype'] != 'link') {
+        if ('link' != $document_data['filetype']) {
             $interbreadcrumb[] = [
                 'url' => $document_sub_data['document_url'],
                 'name' => $document_sub_data['title'],
diff --git a/public/main/document/create_audio.php b/public/main/document/create_audio.php
index abbfd09a90..f90687f868 100644
--- a/public/main/document/create_audio.php
+++ b/public/main/document/create_audio.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * This file allows creating audio files from a text.
  *
- * @package chamilo.document
- *
  * @author Juan Carlos Raña Trabado
  *
  * @since 8/January/2011
@@ -26,7 +24,7 @@ $courseInfo = api_get_course_info();
 $groupRights = Session::read('group_member_with_upload_rights');
 $groupId = api_get_group_id();
 
-if (api_get_setting('enabled_text2audio') === 'false') {
+if ('false' === api_get_setting('enabled_text2audio')) {
     api_not_allowed(true);
 }
 
@@ -64,15 +62,15 @@ if (strstr($dir, '..')) {
     $dir = '/';
 }
 
-if ($dir[0] == '.') {
+if ('.' == $dir[0]) {
     $dir = substr($dir, 1);
 }
 
-if ($dir[0] != '/') {
+if ('/' != $dir[0]) {
     $dir = '/'.$dir;
 }
 
-if ($dir[strlen($dir) - 1] != '/') {
+if ('/' != $dir[strlen($dir) - 1]) {
     $dir .= '/';
 }
 
@@ -140,7 +138,7 @@ for ($i = 0; $i < $array_len; $i++) {
 
 $service = isset($_GET['service']) ? $_GET['service'] : 'google';
 
-if (isset($_POST['text2voice_mode']) && $_POST['text2voice_mode'] == 'google') {
+if (isset($_POST['text2voice_mode']) && 'google' == $_POST['text2voice_mode']) {
     downloadAudioGoogle($dir);
 }
 
@@ -222,7 +220,7 @@ while ($row = Database::fetch_array($result_select)) {
     }
 }
 
-if ($service == 'google') {
+if ('google' == $service) {
     $selected_language = api_get_language_isocode(); //lang default is the course language
     $form = new FormValidator('form1', 'post', api_get_self().'?'.api_get_cidreq(), '', ['id' => 'form1']);
     $form->addHeader(get_lang('Convert your text to speech'));
diff --git a/public/main/document/create_document.php b/public/main/document/create_document.php
index 5952e9e5ff..1c917b07af 100644
--- a/public/main/document/create_document.php
+++ b/public/main/document/create_document.php
@@ -5,8 +5,6 @@ use ChamiloSession as Session;
 
 /**
  * This file allows creating new html documents with an online WYSIWYG html editor.
- *
- * @package chamilo.document
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -59,7 +57,7 @@ $(window).on("load", function () {
 //I'm in the certification module?
 $is_certificate_mode = false;
 
-if (isset($_REQUEST['certificate']) && $_REQUEST['certificate'] == 'true') {
+if (isset($_REQUEST['certificate']) && 'true' == $_REQUEST['certificate']) {
     $is_certificate_mode = true;
 }
 
@@ -122,15 +120,15 @@ if (strstr($dir, '..')) {
     $dir = '/';
 }
 
-if ($dir[0] == '.') {
+if ('.' == $dir[0]) {
     $dir = substr($dir, 1);
 }
 
-if ($dir[0] != '/') {
+if ('/' != $dir[0]) {
     $dir = '/'.$dir;
 }
 
-if ($dir[strlen($dir) - 1] != '/') {
+if ('/' != $dir[strlen($dir) - 1]) {
     $dir .= '/';
 }
 
@@ -164,7 +162,7 @@ for ($i = 0; $i < ($count_dir); $i++) {
     $relative_url .= '../';
 }
 
-if ($relative_url == '') {
+if ('' == $relative_url) {
     $relative_url = '/';
 }
 
@@ -362,21 +360,21 @@ if (!$is_certificate_mode &&
         $escaped_folders = [];
         foreach ($folders as $key => &$val) {
             // Hide some folders
-            if ($val == '/HotPotatoes_files' || $val == '/certificates' || basename($val) == 'css') {
+            if ('/HotPotatoes_files' == $val || '/certificates' == $val || 'css' == basename($val)) {
                 continue;
             }
             // Admin setting for Hide/Show the folders of all users
-            if (api_get_setting('show_users_folders') == 'false' &&
+            if ('false' == api_get_setting('show_users_folders') &&
                 (strstr($val, '/shared_folder') || strstr($val, 'shared_folder_session_'))
             ) {
                 continue;
             }
             // Admin setting for Hide/Show Default folders to all users
-            if (api_get_setting('show_default_folders') == 'false' && ($val == '/images' || $val == '/flash' || $val == '/audio' || $val == '/video' || strstr($val, '/images/gallery') || $val == '/video/flv')) {
+            if ('false' == api_get_setting('show_default_folders') && ('/images' == $val || '/flash' == $val || '/audio' == $val || '/video' == $val || strstr($val, '/images/gallery') || '/video/flv' == $val)) {
                 continue;
             }
             // Admin setting for Hide/Show chat history folder
-            if (api_get_setting('show_chat_folder') == 'false' && $val == '/chat_files') {
+            if ('false' == api_get_setting('show_chat_folder') && '/chat_files' == $val) {
                 continue;
             }
 
@@ -401,31 +399,31 @@ if (!$is_certificate_mode &&
         if (is_array($folders)) {
             foreach ($folders as &$folder) {
                 //Hide some folders
-                if ($folder == '/HotPotatoes_files' || $folder == '/certificates' || basename($folder) == 'css') {
+                if ('/HotPotatoes_files' == $folder || '/certificates' == $folder || 'css' == basename($folder)) {
                     continue;
                 }
                 //Admin setting for Hide/Show the folders of all users
-                if (api_get_setting('show_users_folders') == 'false' &&
+                if ('false' == api_get_setting('show_users_folders') &&
                     (strstr($folder, '/shared_folder') || strstr($folder, 'shared_folder_session_'))
                 ) {
                     continue;
                 }
                 //Admin setting for Hide/Show Default folders to all users
-                if (api_get_setting('show_default_folders') == 'false' &&
+                if ('false' == api_get_setting('show_default_folders') &&
                     (
-                        $folder == '/images' ||
-                        $folder == '/flash' ||
-                        $folder == '/audio' ||
-                        $folder == '/video' ||
+                        '/images' == $folder ||
+                        '/flash' == $folder ||
+                        '/audio' == $folder ||
+                        '/video' == $folder ||
                         strstr($folder, '/images/gallery') ||
-                        $folder == '/video/flv'
+                        '/video/flv' == $folder
                     )
                 ) {
                     continue;
                 }
                 //Admin setting for Hide/Show chat history folder
-                if (api_get_setting('show_chat_folder') == 'false' &&
-                    $folder == '/chat_files'
+                if ('false' == api_get_setting('show_chat_folder') &&
+                    '/chat_files' == $folder
                 ) {
                     continue;
                 }
@@ -440,7 +438,7 @@ if (!$is_certificate_mode &&
                     $label = ' &mdash; '.$folder_titles[$folder];
                 }
                 $parent_select->addOption($label, $folder);
-                if ($selected != '') {
+                if ('' != $selected) {
                     $parent_select->setSelected($folder);
                 }
             }
@@ -458,7 +456,7 @@ if (!$is_certificate_mode &&
                     $label = str_repeat('&nbsp;&nbsp;&nbsp;', count($path_parts) - 2).' &mdash; '.$label;
                 }
                 $parent_select->addOption($label, $folder);
-                if ($selected != '') {
+                if ('' != $selected) {
                     $parent_select->setSelected($folder);
                 }
             }
@@ -486,7 +484,7 @@ if ($form->validate()) {
         $dir = $values['dirValue'];
     }
 
-    if ($dir[strlen($dir) - 1] != '/') {
+    if ('/' != $dir[strlen($dir) - 1]) {
         $dir .= '/';
     }
     $filepath = $filepath.$dir;
diff --git a/public/main/document/create_draw.php b/public/main/document/create_draw.php
index 30c39cf390..3cfe823173 100644
--- a/public/main/document/create_draw.php
+++ b/public/main/document/create_draw.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * This file allows creating new svg and png documents with an online editor.
  *
- * @package chamilo.document
- *
  * @author Juan Carlos Raña Trabado
  *
  * @since 25/september/2010
@@ -48,7 +46,7 @@ $dir = $document_data['path'];
 
 // path for svg-edit save
 Session::write('draw_dir', Security::remove_XSS($dir));
-if ($dir == '/') {
+if ('/' == $dir) {
     Session::write('draw_dir', '');
 }
 
@@ -60,15 +58,15 @@ if (strstr($dir, '..')) {
     $dir = '/';
 }
 
-if ($dir[0] == '.') {
+if ('.' == $dir[0]) {
     $dir = substr($dir, 1);
 }
 
-if ($dir[0] != '/') {
+if ('/' != $dir[0]) {
     $dir = '/'.$dir;
 }
 
-if ($dir[strlen($dir) - 1] != '/') {
+if ('/' != $dir[strlen($dir) - 1]) {
     $dir .= '/';
 }
 
diff --git a/public/main/document/create_paint.php b/public/main/document/create_paint.php
index 7ed25120f9..92385c72c0 100644
--- a/public/main/document/create_paint.php
+++ b/public/main/document/create_paint.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * This file allows creating audio files from a text.
  *
- * @package chamilo.document
- *
  * @author Juan Carlos Raña Trabado
  *
  * @since 30/January/2011
@@ -16,7 +14,7 @@ use ChamiloSession as Session;
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
-if (api_get_setting('enabled_support_paint') === 'false') {
+if ('false' === api_get_setting('enabled_support_paint')) {
     api_not_allowed(true);
 }
 
@@ -54,15 +52,15 @@ if (strstr($dir, '..')) {
     $dir = '/';
 }
 
-if ($dir[0] == '.') {
+if ('.' == $dir[0]) {
     $dir = substr($dir, 1);
 }
 
-if ($dir[0] != '/') {
+if ('/' != $dir[0]) {
     $dir = '/'.$dir;
 }
 
-if ($dir[strlen($dir) - 1] != '/') {
+if ('/' != $dir[strlen($dir) - 1]) {
     $dir .= '/';
 }
 
@@ -148,7 +146,7 @@ $locktarget = 'true';
 $locktitle = 'false';
 $referrer = 'Chamilo';
 
-if ($_SERVER['HTTP_HOST'] == "localhost") {
+if ("localhost" == $_SERVER['HTTP_HOST']) {
     $path_and_file = api_get_path(SYS_PATH).'/crossdomain.xml';
     if (!file_exists($path_and_file)) {
         $crossdomain = '<?xml version="1.0"?>
diff --git a/public/main/document/document.php b/public/main/document/document.php
index 9147fc166b..86ee4beaa7 100644
--- a/public/main/document/document.php
+++ b/public/main/document/document.php
@@ -23,7 +23,7 @@ $url = "../../../resources/document/files?cid=$courseCode&sid=$sessionId";
 header("Location: $url");
 exit;
 
-$allowDownloadDocumentsByApiKey = api_get_setting('allow_download_documents_by_api_key') === 'true';
+$allowDownloadDocumentsByApiKey = 'true' === api_get_setting('allow_download_documents_by_api_key');
 $current_course_tool = TOOL_DOCUMENT;
 $this_section = SECTION_COURSES;
 $to_user_id = null;
@@ -37,7 +37,7 @@ $allowUseTool = false;
 
 if ($allowDownloadDocumentsByApiKey) {
     try {
-        if ($action !== 'download') {
+        if ('download' !== $action) {
             throw new Exception(get_lang('Select an action'));
         }
 
@@ -66,7 +66,7 @@ $_user = api_get_user_info();
 $courseInfo = api_get_course_info();
 $courseId = $courseInfo['real_id'];
 $course_dir = $courseInfo['directory'].'/document';
-$usePpt2lp = api_get_setting('service_ppt2lp', 'active') == 'true';
+$usePpt2lp = 'true' == api_get_setting('service_ppt2lp', 'active');
 $currentUrl = api_get_self().'?'.api_get_cidreq();
 
 // I'm in the certification module?
@@ -74,7 +74,7 @@ $is_certificate_mode = false;
 if (isset($_GET['curdirpath'])) {
     $is_certificate_mode = DocumentManager::is_certificate_mode($_GET['curdirpath']);
 }
-if (isset($_REQUEST['certificate']) && $_REQUEST['certificate'] == 'true') {
+if (isset($_REQUEST['certificate']) && 'true' == $_REQUEST['certificate']) {
     $is_certificate_mode = true;
 }
 
@@ -144,7 +144,7 @@ $group_properties = [];
 $group_properties['directory'] = null;
 
 // For sessions we should check the parameters of visibility
-if (api_get_session_id() != 0) {
+if (0 != api_get_session_id()) {
     $groupMemberWithUploadRights = $groupMemberWithUploadRights && api_is_allowed_to_session_edit(false, true);
 }
 
@@ -164,7 +164,7 @@ if (!empty($groupId)) {
 
     // Let's assume the user cannot upload files for the group
     $groupMemberWithUploadRights = false;
-    if ($group_properties['doc_state'] == 2) {
+    if (2 == $group_properties['doc_state']) {
         // Documents are private
         if ($isAllowedToEdit || GroupManager::is_user_in_group($userId, $group_properties)) {
             // Only courseadmin or group members (members + tutors) allowed
@@ -181,7 +181,7 @@ if (!empty($groupId)) {
         } else {
             $groupId = 0;
         }
-    } elseif ($group_properties['doc_state'] == 1) {
+    } elseif (1 == $group_properties['doc_state']) {
         // Documents are public
         $interbreadcrumb[] = [
             'url' => api_get_path(WEB_CODE_PATH).'group/group.php?'.api_get_cidreq(),
@@ -236,7 +236,7 @@ switch ($action) {
         $document = $repo->find($documentIdToEdit);
 
         // Make visible or invisible?
-        if ($action === 'set_visible') {
+        if ('set_visible' === $action) {
             $repo->setVisibilityPublished($document);
         } else {
             $repo->setVisibilityDraft($document);
@@ -289,7 +289,7 @@ switch ($action) {
 
                 // Check whether the document is in the database.
                 if (!empty($documentInfo)) {
-                    if ($documentInfo['filetype'] != 'link') {
+                    if ('link' != $documentInfo['filetype']) {
                         $deleteDocument = DocumentManager::delete_document(
                             $courseInfo,
                             null,
@@ -345,7 +345,7 @@ switch ($action) {
             $sessionId
         );
 
-        if ($sessionId != 0 && !$document_data) {
+        if (0 != $sessionId && !$document_data) {
             // If there is a session defined and asking for the document *from
             // the session* didn't work, try it from the course (out of a
             // session context)
@@ -371,7 +371,7 @@ switch ($action) {
         exit;
         break;
     case 'downloadfolder':
-        if (api_get_setting('students_download_folders') == 'true' || $isAllowedToEdit) {
+        if ('true' == api_get_setting('students_download_folders') || $isAllowedToEdit) {
             // Get the document data from the ID
             $document_data = DocumentManager::get_document_data_by_id(
                 $document_id,
@@ -380,7 +380,7 @@ switch ($action) {
                 $sessionId
             );
 
-            if ($sessionId != 0 && !$document_data) {
+            if (0 != $sessionId && !$document_data) {
                 // If there is a session defined and asking for the
                 // document * from the session* didn't work, try it from the
                 // course (out of a session context)
@@ -408,7 +408,7 @@ switch ($action) {
     case 'export_to_pdf':
         // @todo disabled for v2
         break;
-        if (api_get_setting('students_export2pdf') == 'true' ||
+        if ('true' == api_get_setting('students_export2pdf') ||
             $isAllowedToEdit || api_is_platform_admin()
         ) {
             $orientation = api_get_configuration_value('document_pdf_orientation');
@@ -420,7 +420,7 @@ switch ($action) {
                 $orientation = in_array($certificateOrientation, ['landscape', 'portrait'])
                     ? $certificateOrientation
                     : 'landscape';
-                $showHeaderAndFooter = !api_get_configuration_value('certificate.hide_header_footer') === 'true';
+                $showHeaderAndFooter = 'true' === !api_get_configuration_value('certificate.hide_header_footer');
             }
 
             DocumentManager::export_to_pdf($document_id, $course_code, $orientation, $showHeaderAndFooter);
@@ -430,9 +430,9 @@ switch ($action) {
         // @todo disabled for v2
         break;
         // Copy a file to general my files user's
-        if (api_get_setting('allow_my_files') == 'true' &&
-            api_get_setting('users_copy_files') == 'true' &&
-            api_get_user_id() != 0 &&
+        if ('true' == api_get_setting('allow_my_files') &&
+            'true' == api_get_setting('users_copy_files') &&
+            0 != api_get_user_id() &&
             !api_is_anonymous()
         ) {
             // Get the document data from the ID
@@ -442,7 +442,7 @@ switch ($action) {
                 true,
                 $sessionId
             );
-            if ($sessionId != 0 && !$document_info) {
+            if (0 != $sessionId && !$document_info) {
                 /* If there is a session defined and asking for the document
                   from the session didn't work, try it from the course
                 (out of a session context)*/
@@ -487,7 +487,7 @@ switch ($action) {
                 '&parent_id='.$parent_id
             );
 
-            if (api_get_setting('allow_my_files') === 'false') {
+            if ('false' === api_get_setting('allow_my_files')) {
                 $file_link = '';
             }
 
@@ -508,7 +508,7 @@ switch ($action) {
                 if (!isset($_GET['copy'])) {
                     Display::addFlash(Display::return_message($message, 'warning', false));
                 }
-                if (isset($_GET['copy']) && $_GET['copy'] === 'yes') {
+                if (isset($_GET['copy']) && 'yes' === $_GET['copy']) {
                     if (!copy($file, $copyfile)) {
                         Display::addFlash(Display::return_message(get_lang('Copy failed'), 'error'));
                     } else {
@@ -615,7 +615,7 @@ if (isset($document_id) && empty($action)) {
         $sessionId
     );
 
-    if ($sessionId != 0 && !$document_data) {
+    if (0 != $sessionId && !$document_data) {
         // If there is a session defined and asking for the
         // document * from the session* didn't work, try it from the course
         // (out of a session context)
@@ -631,7 +631,7 @@ if (isset($document_id) && empty($action)) {
     if ($document_data) {
         $parent_id = $document_data['parent_id'];
         // Hack in order to clean the document id in case of false positive from links
-        if ($document_data['filetype'] == 'link') {
+        if ('link' == $document_data['filetype']) {
             $document_id = null;
         }
 
@@ -644,7 +644,7 @@ if (isset($document_id) && empty($action)) {
         );
 
         if (!empty($document_data['filetype']) &&
-            ($document_data['filetype'] == 'file' || $document_data['filetype'] == 'link')
+            ('file' == $document_data['filetype'] || 'link' == $document_data['filetype'])
         ) {
             if ($visibility && api_is_allowed_to_session_edit()) {
                 $url = api_get_path(WEB_COURSE_PATH).$courseInfo['path'].'/document'.$document_data['path'].'?'.api_get_cidreq();
@@ -661,9 +661,9 @@ if (isset($document_id) && empty($action)) {
 
     // What's the current path?
     // We will verify this a bit further down
-    if (isset($_GET['curdirpath']) && $_GET['curdirpath'] != '') {
+    if (isset($_GET['curdirpath']) && '' != $_GET['curdirpath']) {
         $curdirpath = Security::remove_XSS($_GET['curdirpath']);
-    } elseif (isset($_POST['curdirpath']) && $_POST['curdirpath'] != '') {
+    } elseif (isset($_POST['curdirpath']) && '' != $_POST['curdirpath']) {
         $curdirpath = Security::remove_XSS($_POST['curdirpath']);
     } else {
         $curdirpath = '/';
@@ -672,9 +672,9 @@ if (isset($document_id) && empty($action)) {
 } else {
     // What's the current path?
     // We will verify this a bit further down
-    if (isset($_GET['curdirpath']) && $_GET['curdirpath'] != '') {
+    if (isset($_GET['curdirpath']) && '' != $_GET['curdirpath']) {
         $curdirpath = Security::remove_XSS($_GET['curdirpath']);
-    } elseif (isset($_POST['curdirpath']) && $_POST['curdirpath'] != '') {
+    } elseif (isset($_POST['curdirpath']) && '' != $_POST['curdirpath']) {
         $curdirpath = Security::remove_XSS($_POST['curdirpath']);
     } else {
         $curdirpath = '/';
@@ -699,7 +699,7 @@ if (isset($document_id) && empty($action)) {
     $parent_id = $document_data['parent_id'];
 }
 
-if (isset($document_data) && $document_data['path'] == '/certificates') {
+if (isset($document_data) && '/certificates' == $document_data['path']) {
     $is_certificate_mode = true;
 }
 
@@ -723,7 +723,7 @@ if (!$parent_id) {
 $current_folder_id = $document_id;
 
 // Show preview
-if (isset($_GET['curdirpath']) && $_GET['curdirpath'] == '/certificates' &&
+if (isset($_GET['curdirpath']) && '/certificates' == $_GET['curdirpath'] &&
     isset($_GET['set_preview']) &&
     $_GET['set_preview'] == strval(intval($_GET['set_preview']))
 ) {
@@ -828,7 +828,7 @@ function convertModal (id, format) {
 </script>';
 
 // If they are looking at group documents they can't see the root
-if ($groupId != 0 && $curdirpath == '/') {
+if (0 != $groupId && '/' == $curdirpath) {
     $curdirpath = $group_properties['directory'];
     $curdirpathurl = urlencode($group_properties['directory']);
 }
@@ -838,7 +838,7 @@ if ($groupId != 0 && $curdirpath == '/') {
 //if (!$isAllowedToEdit || api_is_coach()) { before
 
 if (!$isAllowedToEdit && api_is_coach()) {
-    if ($curdirpath != '/' &&
+    if ('/' != $curdirpath &&
         !(DocumentManager::is_visible($curdirpath, $courseInfo, $sessionId, 'folder'))
     ) {
         api_not_allowed(true);
@@ -854,7 +854,7 @@ if ($is_certificate_mode) {
         'name' => get_lang('Assessments'),
     ];
 } else {
-    if ((isset($_GET['id']) && $_GET['id'] != 0) || isset($_GET['curdirpath']) || isset($_GET['createdir'])) {
+    if ((isset($_GET['id']) && 0 != $_GET['id']) || isset($_GET['curdirpath']) || isset($_GET['createdir'])) {
         $interbreadcrumb[] = [
             'url' => 'document.php?'.api_get_cidreq(),
             'name' => get_lang('Documents'),
@@ -876,7 +876,7 @@ if (empty($document_data['parents'])) {
         ];
     } else {
         // Hack in order to not add the document to the breadcrumb in case it is a link
-        if ($document_data['filetype'] != 'link') {
+        if ('link' != $document_data['filetype']) {
             $interbreadcrumb[] = [
                 'url' => '#',
                 'name' => $document_data['title'],
@@ -888,7 +888,7 @@ if (empty($document_data['parents'])) {
     foreach ($document_data['parents'] as $document_sub_data) {
         //fixing double group folder in breadcrumb
         if ($groupId) {
-            if ($counter == 0) {
+            if (0 == $counter) {
                 $counter++;
                 continue;
             }
@@ -922,7 +922,7 @@ $jquery = null;
 
 if (!empty($documentAndFolders)) {
     foreach ($documentAndFolders as $file) {
-        if ($file['filetype'] == 'file') {
+        if ('file' == $file['filetype']) {
             $path_info = pathinfo($file['path']);
             $extension = '';
             if (!empty($path_info['extension'])) {
@@ -938,7 +938,7 @@ if (!empty($documentAndFolders)) {
                     false,
                     $sessionId
                 );
-                if ($sessionId != 0 && !$document_data) {
+                if (0 != $sessionId && !$document_data) {
                     /* If there is a session defined and asking for the document
                      * from the session* didn't work, try it from the
                      course (out of a session context) */
@@ -950,7 +950,7 @@ if (!empty($documentAndFolders)) {
                     );
                 }
 
-                if ($extension == 'ogg') {
+                if ('ogg' == $extension) {
                     $extension = 'oga';
                 }
 
@@ -979,7 +979,7 @@ $htmlHeadXtra[] = '
 Event::event_access_tool(TOOL_DOCUMENT);
 
 /* DISPLAY */
-if ($groupId != 0) { // Add group name after for group documents
+if (0 != $groupId) { // Add group name after for group documents
     $add_group_to_title = ' ('.$group_properties['name'].')';
 }
 $moveForm = '';
@@ -989,7 +989,7 @@ if ($isAllowedToEdit || $groupMemberWithUploadRights ||
     DocumentManager::is_my_shared_folder(api_get_user_id(), $curdirpath, $sessionId) ||
     DocumentManager::is_my_shared_folder(api_get_user_id(), $moveTo, $sessionId)
 ) {
-    if (isset($_GET['move']) && $_GET['move'] != '') {
+    if (isset($_GET['move']) && '' != $_GET['move']) {
         $my_get_move = intval($_REQUEST['move']);
 
         if (api_is_coach()) {
@@ -1095,7 +1095,7 @@ if ($isAllowedToEdit || $groupMemberWithUploadRights ||
 
         // Security fix: make sure they can't move files that are not in the document table
         if (!empty($document_to_move)) {
-            if ($document_to_move['filetype'] === 'link') {
+            if ('link' === $document_to_move['filetype']) {
                 if (!DocumentManager::cloudLinkExists($_course, $moveTo, $document_to_move['comment'])) {
                     DocumentManager::updateDbInfo(
                         'update',
@@ -1121,7 +1121,7 @@ if ($isAllowedToEdit || $groupMemberWithUploadRights ||
                 $curdirpath = $moveTo;
                 $curdirpathurl = urlencode($moveTo);
             } else {
-                if ($moveTo === '/') {
+                if ('/' === $moveTo) {
                     // Move to course root
                     $newParent = api_get_course_entity();
                 } else {
@@ -1220,7 +1220,7 @@ if ($isAllowedToEdit ||
                             }
                             $readonlyAlreadyChecked = true;
                         }
-                        if ($data['filetype'] != 'link') {
+                        if ('link' != $data['filetype']) {
                             // Files and folders
                             $deleteDocument = DocumentManager::delete_document(
                                 $courseInfo,
@@ -1269,10 +1269,10 @@ if ($isAllowedToEdit ||
     DocumentManager::is_my_shared_folder(api_get_user_id(), $curdirpath, $sessionId)
 ) {
     // Create directory with $_POST data
-    if (isset($_POST['create_dir']) && $_POST['dirname'] != '') {
+    if (isset($_POST['create_dir']) && '' != $_POST['dirname']) {
         // Needed for directory creation
         $post_dir_name = $_POST['dirname'];
-        if ($post_dir_name == '../' || $post_dir_name == '.' || $post_dir_name == '..') {
+        if ('../' == $post_dir_name || '.' == $post_dir_name || '..' == $post_dir_name) {
             $message = Display::return_message(get_lang('CannotCreate folder'), 'error');
         } else {
             // dir_id is the parent folder id.
@@ -1284,7 +1284,7 @@ if ($isAllowedToEdit ||
                     false,
                     $sessionId
                 );
-                if ($sessionId != 0 && !$document_data) {
+                if (0 != $sessionId && !$document_data) {
                     // If there is a session defined and asking for the
                     // document * from the session* didn't work, try it from
                     // the course (out of a session context)
@@ -1297,7 +1297,7 @@ if ($isAllowedToEdit ||
                 }
                 $curdirpath = $document_data['path'];
             }
-            $added_slash = $curdirpath == '/' ? '' : '/';
+            $added_slash = '/' == $curdirpath ? '' : '/';
             $dir_name = $curdirpath.$added_slash.api_replace_dangerous_char($post_dir_name);
             $dir_name = disable_dangerous_file($dir_name);
             $visibility = empty($groupId) ? null : 1;
@@ -1449,7 +1449,7 @@ if ($isAllowedToEdit ||
 // END ACTION MENU
 // Attach certificate in the gradebook
 if (isset($_GET['curdirpath']) &&
-    strpos($_GET['curdirpath'], '/certificates') !== false &&
+    false !== strpos($_GET['curdirpath'], '/certificates') &&
     isset($_GET['set_certificate']) &&
     $_GET['set_certificate'] == strval(intval($_GET['set_certificate']))
 ) {
@@ -1486,7 +1486,7 @@ if (isset($_GET['keyword']) && !empty($_GET['keyword'])) {
     );
 }
 
-if ($groupId != 0) {
+if (0 != $groupId) {
     $userAccess = GroupManager::user_has_access(
         api_get_user_id(),
         $groupIid,
@@ -1511,13 +1511,13 @@ if ($groupId != 0) {
     );
 }
 
-if (!isset($folders) || $folders === false) {
+if (!isset($folders) || false === $folders) {
     $folders = [];
 }
 $btngroup = ['class' => 'btn btn-default'];
 /* GO TO PARENT DIRECTORY */
 $actionsLeft = '';
-if ($curdirpath != '/' &&
+if ('/' != $curdirpath &&
     $curdirpath != $group_properties['directory'] &&
     !$is_certificate_mode
 ) {
@@ -1526,7 +1526,7 @@ if ($curdirpath != '/' &&
     $actionsLeft .= '</a>';
 }
 
-if ($is_certificate_mode && $curdirpath != '/certificates') {
+if ($is_certificate_mode && '/certificates' != $curdirpath) {
     $actionsLeft .= Display::url(
         Display::return_icon('folder_up.png', get_lang('Up'), '', ICON_SIZE_MEDIUM),
         api_get_self().'?'.api_get_cidreq().'&id='.$parent_id.$certificateLink
@@ -1555,7 +1555,7 @@ if ($isAllowedToEdit ||
         );
 
         // Create new draw
-        if (api_get_setting('enabled_support_svg') == 'true') {
+        if ('true' == api_get_setting('enabled_support_svg')) {
             if (api_browser_support('svg')) {
                 $actionsLeft .= Display::url(
                     Display::return_icon('new_draw.png', get_lang('Draw'), '', ICON_SIZE_MEDIUM),
@@ -1572,7 +1572,7 @@ if ($isAllowedToEdit ||
         }
 
         // Create new paint
-        if (api_get_setting('enabled_support_pixlr') == 'true') {
+        if ('true' == api_get_setting('enabled_support_pixlr')) {
             $actionsLeft .= Display::url(
                 Display::return_icon(
                     'new_paint.png',
@@ -1586,7 +1586,7 @@ if ($isAllowedToEdit ||
         }
 
         // Record an image clip from my webcam
-        if (api_get_setting('enable_webcam_clip') == 'true') {
+        if ('true' == api_get_setting('enable_webcam_clip')) {
             $actionsLeft .= Display::url(
                 Display::return_icon('webcam.png', get_lang('Webcam Clip'), '', ICON_SIZE_MEDIUM),
                 api_get_path(WEB_CODE_PATH).'document/webcam_clip.php?'.api_get_cidreq().'&id='.$document_id
@@ -1594,7 +1594,7 @@ if ($isAllowedToEdit ||
         }
 
         // Record audio (nanogong)
-        if (api_get_setting('enable_record_audio') === 'true') {
+        if ('true' === api_get_setting('enable_record_audio')) {
             $actionsLeft .= Display::url(
                 Display::return_icon('new_recording.png', get_lang('Record my voice'), '', ICON_SIZE_MEDIUM),
                 api_get_path(WEB_CODE_PATH).'document/record_audio.php?'.api_get_cidreq().'&id='.$document_id
@@ -1602,7 +1602,7 @@ if ($isAllowedToEdit ||
         }
 
         // Create new audio from text
-        if (api_get_setting('enabled_text2audio') == 'true') {
+        if ('true' == api_get_setting('enabled_text2audio')) {
             $actionsLeft .= Display::url(
                 Display::return_icon('new_sound.png', get_lang('Create audio'), '', ICON_SIZE_MEDIUM),
                 api_get_path(WEB_CODE_PATH).'document/create_audio.php?'.api_get_cidreq().'&id='.$document_id
@@ -1699,7 +1699,7 @@ $total_size = 0;
 $getSizeURL = api_get_path(WEB_AJAX_PATH).'document.ajax.php?a=get_dir_size&'.api_get_cidreq();
 
 $sortable_data = [];
-if (!empty($documentAndFolders) && ($groupId === 0 || $userAccess)) {
+if (!empty($documentAndFolders) && (0 === $groupId || $userAccess)) {
     $sortable_data = DocumentManager::processDocumentAndFolders(
         $documentAndFolders,
         $courseInfo,
@@ -1712,14 +1712,14 @@ if (!empty($documentAndFolders) && ($groupId === 0 || $userAccess)) {
 if (!empty($documentAndFolders)) {
     // Show download zipped folder icon
     if (!$is_certificate_mode && (
-            api_get_setting('students_download_folders') == 'true' ||
+            'true' == api_get_setting('students_download_folders') ||
             $isAllowedToEdit ||
             api_is_platform_admin()
         )
     ) {
         //for student does not show icon into other shared folder, and does not show into main path (root)
         if (DocumentManager::is_my_shared_folder(api_get_user_id(), $curdirpath, $sessionId) &&
-            $curdirpath != '/' ||
+            '/' != $curdirpath ||
             $isAllowedToEdit ||
             api_is_platform_admin()
         ) {
@@ -1749,7 +1749,7 @@ if (!empty($moveTo)) {
     $document_id = DocumentManager::get_document_id($courseInfo, $moveTo);
 }
 
-if (isset($_GET['createdir']) && isset($_POST['dirname']) && $_POST['dirname'] != '') {
+if (isset($_GET['createdir']) && isset($_POST['dirname']) && '' != $_POST['dirname']) {
     $post_dir_name = $_POST['dirname'];
     $document_id = DocumentManager::get_document_id($courseInfo, $_POST['dirname']);
 }
@@ -1785,12 +1785,12 @@ if (!empty($documentAndFolders) && !empty($sortable_data)) {
     $column_show[] = 0;
     $column_order = [];
 
-    if (count(reset($sortable_data)) == 12) {
+    if (12 == count(reset($sortable_data))) {
         //teacher
         $column_order[2] = 8; //name
         $column_order[3] = 7;
         $column_order[4] = 6;
-    } elseif (count(reset($sortable_data)) == 10) {
+    } elseif (10 == count(reset($sortable_data))) {
         //student
         $column_order[1] = 6;
         $column_order[2] = 5;
diff --git a/public/main/document/document_quota.php b/public/main/document/document_quota.php
index f89f10df49..e2a7086a46 100644
--- a/public/main/document/document_quota.php
+++ b/public/main/document/document_quota.php
@@ -3,8 +3,6 @@
 
 /**
  * Document quota management script.
- *
- * @package chamilo.document
  */
 use Chamilo\CoreBundle\Framework\Container;
 
@@ -90,11 +88,11 @@ if (!empty($group_list)) {
 $document_list = DocumentManager::getAllDocumentData(api_get_course_info());
 if (!empty($document_list)) {
     foreach ($document_list as $document_data) {
-        if ($document_data['creator_id'] == api_get_user_id() && $document_data['filetype'] === 'file') {
+        if ($document_data['creator_id'] == api_get_user_id() && 'file' === $document_data['filetype']) {
             $quota_bytes += $document_data['size'];
         }
     }
-    if ($quota_bytes != 0) {
+    if (0 != $quota_bytes) {
         $quotaPercentage = round($quota_bytes / $total_quota_bytes, 2) * 100;
     }
 
@@ -103,7 +101,7 @@ if (!empty($document_list)) {
         $quotaPercentage,
     ];
     //if a sesson is active
-    if ($sessionId != 0) {
+    if (0 != $sessionId) {
         if (!empty($course_list)) {
             $total_courses_quota = 0;
             $total_quota_bytes = 0;
@@ -112,7 +110,7 @@ if (!empty($document_list)) {
                     $total_quota_bytes += DocumentManager::get_course_quota($course_data['id']);
                 }
             }
-            if ($quota_bytes != 0) {
+            if (0 != $quota_bytes) {
                 $quotaPercentage = round($quota_bytes / $total_quota_bytes, 2) * 100;
             }
         }
diff --git a/public/main/document/document_slideshow.inc.php b/public/main/document/document_slideshow.inc.php
index d4edbf770d..47ae1b92f5 100644
--- a/public/main/document/document_slideshow.inc.php
+++ b/public/main/document/document_slideshow.inc.php
@@ -17,8 +17,6 @@
  *
  * @author Patrick Cool, responsible author
  * @author Roan Embrechts, minor cleanup
- *
- * @package chamilo.document
  */
 /**
  * General code that belongs in document.php.
@@ -53,7 +51,7 @@ if (isset($all_files) && is_array($all_files) && count($all_files) > 0) {
 }*/
 
 $tablename_column = isset($_GET['tablename_column']) ? Security::remove_XSS($_GET['tablename_column']) : 0;
-if ($tablename_column == 0) {
+if (0 == $tablename_column) {
     $tablename_column = 1;
 } else {
     $tablename_column = intval($tablename_column) - 1;
@@ -68,7 +66,7 @@ function sort_files($table)
     $temp = [];
 
     foreach ($table as &$file_array) {
-        if ($file_array['filetype'] == 'file') {
+        if ('file' == $file_array['filetype']) {
             $slideshow_extension = strrchr($file_array['path'], '.');
             $slideshow_extension = strtolower($slideshow_extension);
             if (in_array($slideshow_extension, $accepted_extensions)) {
@@ -78,7 +76,7 @@ function sort_files($table)
         }
     }
 
-    if ($tablename_direction == 'DESC') {
+    if ('DESC' == $tablename_direction) {
         usort($temp, 'rsort_table');
     } else {
         usort($temp, 'sort_table');
diff --git a/public/main/document/download_scorm.php b/public/main/document/download_scorm.php
index f5ae5fd6bf..37023632d3 100644
--- a/public/main/document/download_scorm.php
+++ b/public/main/document/download_scorm.php
@@ -5,8 +5,6 @@ use ChamiloSession as Session;
 
 /**
  * This file is responsible for passing requested documents to the browser.
- *
- * @package chamilo.document
  */
 session_cache_limiter('none');
 
@@ -57,7 +55,7 @@ if (Security::check_abs_path($sys_course_path.$doc_url, $sys_course_path.'/')) {
 
     $fixLinks = api_get_configuration_value('lp_replace_http_to_https');
     $result = DocumentManager::file_send_for_download($full_file_name, false, '', $fixLinks);
-    if ($result === false) {
+    if (false === $result) {
         api_not_allowed(true, get_lang('The file was not found'), 404);
     }
 } else {
diff --git a/public/main/document/download_uploaded_files.php b/public/main/document/download_uploaded_files.php
index 7bb24eb2e3..58f44bf661 100644
--- a/public/main/document/download_uploaded_files.php
+++ b/public/main/document/download_uploaded_files.php
@@ -29,7 +29,7 @@ if (!is_dir($toolPath)) {
 if (Security::check_abs_path($toolPath.$file, $toolPath.'/')) {
     $fullFilePath = $toolPath.$file;
     $result = DocumentManager::file_send_for_download($fullFilePath, false, '');
-    if ($result === false) {
+    if (false === $result) {
         api_not_allowed(true);
     }
 }
diff --git a/public/main/document/downloadfolder.inc.php b/public/main/document/downloadfolder.inc.php
index 0a449b8aff..f243a7c41d 100644
--- a/public/main/document/downloadfolder.inc.php
+++ b/public/main/document/downloadfolder.inc.php
@@ -7,8 +7,6 @@ use ChamiloSession as Session;
 
 /**
  * Functions and main code for the download folder feature.
- *
- * @package chamilo.document
  */
 set_time_limit(0);
 
@@ -52,7 +50,7 @@ if (empty($path)) {
 }
 
 // A student should not be able to download a root shared directory
-if (($path == '/shared_folder' ||
+if (('/shared_folder' == $path ||
     $path == '/shared_folder_session_'.api_get_session_id()) &&
     (!api_is_allowed_to_edit() || !api_is_platform_admin())
 ) {
@@ -62,14 +60,14 @@ if (($path == '/shared_folder' ||
 // Creating a ZIP file.
 $tempZipFile = api_get_path(SYS_ARCHIVE_PATH).api_get_unique_id().".zip";
 
-$name = ($path == '/') ? 'documents.zip' : $documentInfo['title'].'.zip';
+$name = ('/' == $path) ? 'documents.zip' : $documentInfo['title'].'.zip';
 $zip = api_create_zip($name);
 $doc_table = Database::get_course_table(TABLE_DOCUMENT);
 $prop_table = Database::get_course_table(TABLE_ITEM_PROPERTY);
 
 // We need this path to clean it out of the zip file
 // I'm not using dir name as it gives too much problems (cfr.)
-$remove_dir = ($path != '/') ? substr($path, 0, strlen($path) - strlen(basename($path))) : '/';
+$remove_dir = ('/' != $path) ? substr($path, 0, strlen($path) - strlen(basename($path))) : '/';
 
 // Put the files in the zip
 // 2 possibilities: Admins get all files and folders in the selected folder (except for the deleted ones)
@@ -101,9 +99,9 @@ function fixDocumentNameCallback($p_event, &$p_header)
         $documentNameFixed
     );
 
-    if ($remove_dir != '/') {
+    if ('/' != $remove_dir) {
         $documentNameFixed = str_replace($remove_dir, '/', $documentNameFixed);
-        if (substr($documentNameFixed, 0, 1) == '/') {
+        if ('/' == substr($documentNameFixed, 0, 1)) {
             $documentNameFixed = substr($documentNameFixed, 1, api_strlen($documentNameFixed));
         }
     } else {
@@ -131,7 +129,7 @@ Event::event_download($name);
 // Admins are allowed to download invisible files
 if (api_is_allowed_to_edit()) {
     // Set the path that will be used in the query
-    if ($path === '/') {
+    if ('/' === $path) {
         $querypath = ''; // To prevent ...path LIKE '//%'... in query
     } else {
         $querypath = $path;
@@ -192,7 +190,7 @@ if (api_is_allowed_to_edit()) {
     $zip->finish();
 } else {
     // For other users, we need to create a zip  file with only visible files and folders
-    if ($path == '/') {
+    if ('/' == $path) {
         $querypath = ''; // To prevent ...path LIKE '//%'... in query
     } else {
         $querypath = $path;
diff --git a/public/main/document/edit_document.php b/public/main/document/edit_document.php
index 74c2933b49..3202b89739 100644
--- a/public/main/document/edit_document.php
+++ b/public/main/document/edit_document.php
@@ -24,8 +24,6 @@ use ChamiloSession as Session;
  * database, regardless of wether they are visible/invisible, have
  * comments or not.
  *
- * @package chamilo.document
- *
  * @todo improve script structure (FormValidator is used to display form, but
  * not for validation at the moment)
  */
@@ -244,7 +242,7 @@ if (isset($_POST['comment'])) {
 
     if (!empty($document_id)) {
         $linkExists = false;
-        if ($file_type == 'link') {
+        if ('link' == $file_type) {
             $linkExists = DocumentManager::cloudLinkExists($course_info, $file, $_POST['comment']);
         }
 
@@ -256,7 +254,7 @@ if (isset($_POST['comment'])) {
             $em->persist($document);
             $em->flush();
 
-            if ($file_type != 'link') {
+            if ('link' != $file_type) {
                 Display::addFlash(Display::return_message(get_lang('Update successful')));
             } else {
                 Display::addFlash(Display::return_message(get_lang('Cloud file link updated.')));
@@ -268,17 +266,17 @@ if (isset($_POST['comment'])) {
 }
 
 if ($is_allowed_to_edit) {
-    if (isset($_POST['formSent']) && $_POST['formSent'] == 1 && !empty($document_id)) {
+    if (isset($_POST['formSent']) && 1 == $_POST['formSent'] && !empty($document_id)) {
         $content = isset($_POST['content']) ? trim(str_replace(["\r", "\n"], '', stripslashes($_POST['content']))) : null;
         $content = Security::remove_XSS($content, COURSEMANAGERLOWSECURITY);
-        if ($dir == '/') {
+        if ('/' == $dir) {
             $dir = '';
         }
 
         $read_only_flag = isset($_POST['readonly']) ? $_POST['readonly'] : null;
         $read_only_flag = empty($read_only_flag) ? 0 : 1;
 
-        if ($read_only_flag == 0 && !empty($content)) {
+        if (0 == $read_only_flag && !empty($content)) {
             $documentRepository->updateDocumentContent($document, $content);
         }
 
@@ -339,7 +337,7 @@ if ($owner_id == api_get_user_id() ||
 
     // Form title
     $form->addHeader($nameTools);
-    $key_label_title = $file_type != 'link' ? 'Title' : 'LinkName';
+    $key_label_title = 'link' != $file_type ? 'Title' : 'LinkName';
     $form->addText(
         'title',
         get_lang($key_label_title),
@@ -356,13 +354,13 @@ if ($owner_id == api_get_user_id() ||
 
     // HotPotatoes tests are html files, but they should not be edited in order their functionality to be preserved.
     $showSystemFolders = api_get_course_setting('show_system_folders');
-    $condition = stripos($dir, '/HotPotatoes_files') === false;
-    if ($showSystemFolders == 1) {
+    $condition = false === stripos($dir, '/HotPotatoes_files');
+    if (1 == $showSystemFolders) {
         $condition = true;
     }
 
-    if (($extension == 'htm' || $extension == 'html') && $condition) {
-        if (empty($readonly) && $readonly == 0) {
+    if (('htm' == $extension || 'html' == $extension) && $condition) {
+        if (empty($readonly) && 0 == $readonly) {
             $form->addHtmlEditor('content', get_lang('Content'), true, true, $editorConfig);
         }
     }
@@ -371,7 +369,7 @@ if ($owner_id == api_get_user_id() ||
         $form->addLabel(get_lang('Created on'), Display::dateToStringAgoAndLongDate($createdDate));
     }
 
-    if ($file_type != 'link') {
+    if ('link' != $file_type) {
         if (!$group_document && !DocumentManager::is_my_shared_folder(api_get_user_id(), $currentDirPath, $sessionId)) {
             $form->addLabel(get_lang('Update successfulOn'), Display::dateToStringAgoAndLongDate($last_edit_date));
         }
@@ -384,7 +382,7 @@ if ($owner_id == api_get_user_id() ||
         }
     }
 
-    if ($file_type == 'link') {
+    if ('link' == $file_type) {
         // URLs in whitelist
         $urlWL = DocumentManager::getFileHostingWhiteList();
         sort($urlWL);
@@ -405,16 +403,16 @@ if ($owner_id == api_get_user_id() ||
         $form->addElement('textarea', 'comment', get_lang('Comment'), ['cols-size' => [2, 10, 0]]);
     }
 
-    if ($file_type != 'link') {
+    if ('link' != $file_type) {
         if ($owner_id == api_get_user_id() || api_is_platform_admin()) {
             $checked = &$form->addElement('checkbox', 'readonly', null, get_lang('Read only'));
-            if ($readonly == 1) {
+            if (1 == $readonly) {
                 $checked->setChecked(true);
             }
         }
     }
 
-    if ($file_type == 'link') {
+    if ('link' == $file_type) {
         $form->addRule('title', get_lang('Please enter a name for this Cloud link'), 'required');
         $form->addRule('comment', get_lang('Please enter the URL'), 'required');
         // Well formed url pattern (must have the protocol)
@@ -427,7 +425,7 @@ if ($owner_id == api_get_user_id() ||
 
     if ($is_certificate_mode) {
         $form->addButtonUpdate(get_lang('Save certificate'));
-    } elseif ($file_type == 'link') {
+    } elseif ('link' == $file_type) {
         $form->addButtonUpdate(get_lang('Save link'));
     } else {
         $form->addButtonUpdate(get_lang('Save document'));
@@ -470,12 +468,12 @@ if ($owner_id == api_get_user_id() ||
         );
     }
 
-    if ($extension == 'svg' && !api_browser_support('svg') &&
-        api_get_setting('enabled_support_svg') == 'true'
+    if ('svg' == $extension && !api_browser_support('svg') &&
+        'true' == api_get_setting('enabled_support_svg')
     ) {
         echo Display::return_message(get_lang('Your browser does not support SVG files. To use the drawing tool you must have an advanced browser such as Firefox or Chrome'), 'warning');
     }
-    if ($file_type != 'link') {
+    if ('link' != $file_type) {
         // HTML-editor
         echo '<div class="page-create">
                 <div class="row" style="overflow:hidden">
@@ -523,20 +521,20 @@ function show_return($document_id, $path, $call_from_tool = '', $slide_id = 0, $
         $actionsLeft .= '<a href="document.php?curdirpath='.$selectedCategory.'&selectcat='.$selectedCategory.'">'.
             Display::return_icon('back.png', get_lang('Back').' '.get_lang('To').' '.get_lang('Certificate overview'), '', ICON_SIZE_MEDIUM).'</a>';
         $actionsLeft .= '<a id="hide_bar_template" href="#" role="button">'.Display::return_icon('expand.png', get_lang('Expand'), ['id' => 'expand'], ICON_SIZE_MEDIUM).Display::return_icon('contract.png', get_lang('Collapse'), ['id' => 'contract', 'class' => 'hide'], ICON_SIZE_MEDIUM).'</a>';
-    } elseif ($call_from_tool == 'slideshow') {
+    } elseif ('slideshow' == $call_from_tool) {
         /*$actionsLeft .= '<a href="'.api_get_path(WEB_PATH).'main/document/slideshow.php?slide_id='.$slide_id.'&curdirpath='.Security::remove_XSS(urlencode($_GET['curdirpath'])).'">'.
             Display::return_icon('slideshow.png', get_lang('Back to').' '.get_lang('View Slideshow'), '', ICON_SIZE_MEDIUM).'</a>';
         */
-    } elseif ($call_from_tool == 'editdraw') {
+    } elseif ('editdraw' == $call_from_tool) {
         $actionsLeft .= '<a href="'.$url.'">'.
             Display::return_icon('back.png', get_lang('Back to').' '.get_lang('Documents overview'), '', ICON_SIZE_MEDIUM).'</a>';
         $actionsLeft .= '<a href="javascript:history.back(1)">'.Display::return_icon('draw.png', get_lang('Back to').' '.get_lang('Draw'), [], 32).'</a>';
-    } elseif ($call_from_tool == 'editodf') {
+    } elseif ('editodf' == $call_from_tool) {
         $actionsLeft .= '<a href="'.$url.'">'.
             Display::return_icon('back.png', get_lang('Back to').' '.get_lang('Documents overview'), '', ICON_SIZE_MEDIUM).'</a>';
         $actionsLeft .= '<a href="javascript:history.back(1)">'.Display::return_icon('draw.png', get_lang('Back to').' '.get_lang('Write'), [], 32).'</a>';
         $actionsLeft .= '<a id="hide_bar_template" href="#" role="button">'.Display::return_icon('expand.png', get_lang('Expand'), ['id' => 'expand'], ICON_SIZE_MEDIUM).Display::return_icon('contract.png', get_lang('Collapse'), ['id' => 'contract', 'class' => 'hide'], ICON_SIZE_MEDIUM).'</a>';
-    } elseif ($call_from_tool == 'editpaint' && api_get_setting('enabled_support_pixlr') === 'true') {
+    } elseif ('editpaint' == $call_from_tool && 'true' === api_get_setting('enabled_support_pixlr')) {
         $actionsLeft .= '<a href="'.$url.'">'.
             Display::return_icon('back.png', get_lang('Back to').' '.get_lang('Documents overview'), [], ICON_SIZE_MEDIUM).'</a>';
         $actionsLeft .= '<a href="javascript:history.back(1)">'.Display::return_icon('paint.png', get_lang('Back to').' '.get_lang('Paint'), [], 32).'</a>';
diff --git a/public/main/document/edit_draw.php b/public/main/document/edit_draw.php
index 7d9f682b9a..000bcc6f8c 100644
--- a/public/main/document/edit_draw.php
+++ b/public/main/document/edit_draw.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * This file allows creating new svg and png documents with an online editor.
  *
- * @package chamilo.document
- *
  * @author Juan Carlos Ra�a Trabado
  *
  * @since 25/september/2010
@@ -45,7 +43,7 @@ $group_id = api_get_group_id();
 
 //path for svg-edit save
 Session::write('draw_dir', Security::remove_XSS($dir));
-if ($dir == '/') {
+if ('/' == $dir) {
     Session::write('draw_dir', '');
 }
 Session::write('draw_file', basename(Security::remove_XSS($file_path)));
@@ -65,15 +63,15 @@ if (strstr($dir, '..')) {
     $dir = '/';
 }
 
-if ($dir[0] == '.') {
+if ('.' == $dir[0]) {
     $dir = substr($dir, 1);
 }
 
-if ($dir[0] != '/') {
+if ('/' != $dir[0]) {
     $dir = '/'.$dir;
 }
 
-if ($dir[strlen($dir) - 1] != '/') {
+if ('/' != $dir[strlen($dir) - 1]) {
     $dir .= '/';
 }
 
diff --git a/public/main/document/edit_odf.php b/public/main/document/edit_odf.php
index 75fe56e84b..6c1802857d 100644
--- a/public/main/document/edit_odf.php
+++ b/public/main/document/edit_odf.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * ODF document editor script.
- *
- * @package chamilo.document
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -43,7 +41,7 @@ $showOdfEditor = false;
 $webOdfSupportedFiles = DocumentManager::get_web_odf_extension_list();
 
 if (in_array(strtolower($pathinfo['extension']), $webOdfSupportedFiles) &&
-    api_get_configuration_value('enabled_support_odf') === true
+    true === api_get_configuration_value('enabled_support_odf')
 ) {
     $showOdfEditor = true;
 }
diff --git a/public/main/document/edit_paint.php b/public/main/document/edit_paint.php
index cf1a4b7997..d67160c268 100644
--- a/public/main/document/edit_paint.php
+++ b/public/main/document/edit_paint.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * This file allows creating new svg and png documents with an online editor.
  *
- * @package chamilo.document
- *
  * @todo used the document_id instead of the curdirpath
  *
  * @author Juan Carlos Raña Trabado
@@ -63,15 +61,15 @@ if (strstr($dir, '..')) {
     $dir = '/';
 }
 
-if ($dir[0] == '.') {
+if ('.' == $dir[0]) {
     $dir = substr($dir, 1);
 }
 
-if ($dir[0] != '/') {
+if ('/' != $dir[0]) {
     $dir = '/'.$dir;
 }
 
-if ($dir[strlen($dir) - 1] != '/') {
+if ('/' != $dir[strlen($dir) - 1]) {
     $dir .= '/';
 }
 
@@ -148,7 +146,7 @@ $target = $target_path;
 $locktarget = "true";
 $locktitle = "false";
 
-if ($_SERVER['HTTP_HOST'] == "localhost") {
+if ("localhost" == $_SERVER['HTTP_HOST']) {
     $path_and_file = api_get_path(SYS_PATH).'/crossdomain.xml';
     if (!file_exists($path_and_file)) {
         $crossdomain = '<?xml version="1.0"?>
diff --git a/public/main/document/exit_pixlr.php b/public/main/document/exit_pixlr.php
index ff6f7a1dab..449314be29 100644
--- a/public/main/document/exit_pixlr.php
+++ b/public/main/document/exit_pixlr.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * This file allows creating new svg and png documents with an online editor.
  *
- * @package chamilo.document
- *
  * @author Juan Carlos Ra�a Trabado
  *
  * @since 30/january/2011
diff --git a/public/main/document/record_audio.php b/public/main/document/record_audio.php
index 2c645512cf..2c1726ca04 100644
--- a/public/main/document/record_audio.php
+++ b/public/main/document/record_audio.php
@@ -5,8 +5,6 @@ use ChamiloSession as Session;
 
 /**
  * This file allows record audio files.
- *
- * @package chamilo.document
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $this_section = SECTION_COURSES;
@@ -43,7 +41,7 @@ $dir = $document_data['path'];
 
 //make some vars
 $wamidir = $dir;
-if ($wamidir == "/") {
+if ("/" == $wamidir) {
     $wamidir = '';
 }
 $wamiurlplay = api_get_path(WEB_COURSE_PATH).api_get_course_path().'/document'.$wamidir."/";
@@ -56,15 +54,15 @@ if (strstr($dir, '..')) {
     $dir = '/';
 }
 
-if ($dir[0] == '.') {
+if ('.' == $dir[0]) {
     $dir = substr($dir, 1);
 }
 
-if ($dir[0] != '/') {
+if ('/' != $dir[0]) {
     $dir = '/'.$dir;
 }
 
-if ($dir[strlen($dir) - 1] != '/') {
+if ('/' != $dir[strlen($dir) - 1]) {
     $dir .= '/';
 }
 
@@ -117,7 +115,7 @@ if (isset($document_data['parents'])) {
     foreach ($document_data['parents'] as $document_sub_data) {
         //fixing double group folder in breadcrumb
         if (api_get_group_id()) {
-            if ($counter == 0) {
+            if (0 == $counter) {
                 $counter++;
                 continue;
             }
diff --git a/public/main/document/save_pixlr.php b/public/main/document/save_pixlr.php
index 4fba030414..fef375c6ac 100644
--- a/public/main/document/save_pixlr.php
+++ b/public/main/document/save_pixlr.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * This file allows creating new svg and png documents with an online editor.
  *
- * @package chamilo.document
- *
  * @author Juan Carlos Raña Trabado
  *
  * @since 30/january/2011
@@ -74,23 +72,23 @@ $filename = Security::remove_XSS($filename);
 $filename = api_replace_dangerous_char($filename);
 $filename = disable_dangerous_file($filename);
 
-if (strlen(trim($filename)) == 0) {
+if (0 == strlen(trim($filename))) {
     echo "The title is empty"; //if title is empty, headers Content-Type = application/octet-stream,
     // then not create a new title here please
     exit;
 }
 
 //check file_get_contents
-if ($contents === false) {
+if (false === $contents) {
     echo "I cannot read: ".$urlcontents;
     exit;
 }
 
 // Extension security
-if ($extension != 'jpg' && $extension != 'png' && $extension != 'pxd') {
+if ('jpg' != $extension && 'png' != $extension && 'pxd' != $extension) {
     die();
 }
-if ($extension == 'pxd') {
+if ('pxd' == $extension) {
     echo "pxd file type does not supported";
     // not secure because check security headers and finfo() return  Content-Type = application/octet-stream
     exit;
@@ -99,7 +97,7 @@ if ($extension == 'pxd') {
 //Verify that the file is an image. Headers method
 $headers = get_headers($urlcontents, 1);
 $content_type = explode("/", $headers['Content-Type']);
-if ($content_type[0] != "image") {
+if ("image" != $content_type[0]) {
     echo "Invalid file type";
     exit;
 }
@@ -108,7 +106,7 @@ if ($content_type[0] != "image") {
 $finfo = new finfo(FILEINFO_MIME);
 $current_mime = $finfo->buffer($contents);
 
-if (strpos($current_mime, 'image') === false) {
+if (false === strpos($current_mime, 'image')) {
     echo "Invalid mime type file";
     exit;
 }
diff --git a/public/main/document/show_content.php b/public/main/document/show_content.php
index 41c11b5478..1df8e13a59 100644
--- a/public/main/document/show_content.php
+++ b/public/main/document/show_content.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * @author jmontoya
- *
- * @package chamilo.document
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -33,7 +31,7 @@ $document_data = DocumentManager::get_document_data_by_id(
     $session_id
 );
 
-if ($session_id != 0 && !$document_data) {
+if (0 != $session_id && !$document_data) {
     $document_data = DocumentManager::get_document_data_by_id(
         $document_id,
         $course_code,
@@ -78,7 +76,7 @@ if (is_dir($file_url_sys)) {
 //fix the screen when you try to access a protected course through the url
 $is_allowed_in_course = api_is_allowed_in_course();
 
-if ($is_allowed_in_course == false) {
+if (false == $is_allowed_in_course) {
     api_not_allowed(true);
 }
 
@@ -107,7 +105,7 @@ $browser_display_title = 'Documents - '.Security::remove_XSS($_GET['cidReq']).'
 $file_url_web = api_get_path(WEB_COURSE_PATH).$course_info['path'].'/document'.$header_file.'?'.api_get_cidreq();
 $pathinfo = pathinfo($header_file);
 
-if ($pathinfo['extension'] == 'swf') {
+if ('swf' == $pathinfo['extension']) {
     $width = '83%';
     $height = '83%';
 } else {
diff --git a/public/main/document/showinframes.php b/public/main/document/showinframes.php
index d9c9a1f49b..674b598311 100644
--- a/public/main/document/showinframes.php
+++ b/public/main/document/showinframes.php
@@ -19,8 +19,6 @@
  * @version 0.6
  *
  * @author Roan Embrechts (roan.embrechts@vub.ac.be)
- *
- * @package chamilo.document
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -28,7 +26,7 @@ api_protect_course_script();
 
 $header_file = isset($_GET['file']) ? Security::remove_XSS($_GET['file']) : null;
 $document_id = (int) $_GET['id'];
-$originIsLearnpath = isset($_GET['origin']) && $_GET['origin'] === 'learnpathitem';
+$originIsLearnpath = isset($_GET['origin']) && 'learnpathitem' === $_GET['origin'];
 $courseInfo = api_get_course_info();
 $course_code = api_get_course_id();
 $session_id = api_get_session_id();
@@ -50,7 +48,7 @@ $document_data = DocumentManager::get_document_data_by_id(
     $session_id
 );
 
-if ($session_id != 0 && !$document_data) {
+if (0 != $session_id && !$document_data) {
     $document_data = DocumentManager::get_document_data_by_id(
         $document_id,
         $course_code,
@@ -76,7 +74,7 @@ $file_url_web = api_get_path(WEB_COURSE_PATH).$file_root;
 $is_allowed_to_edit = api_is_allowed_to_edit();
 //fix the screen when you try to access a protected course through the url
 $is_allowed_in_course = api_is_allowed_in_course() || $is_allowed_to_edit;
-if ($is_allowed_in_course == false) {
+if (false == $is_allowed_in_course) {
     api_not_allowed(true);
 }
 
@@ -105,7 +103,7 @@ $group_id = api_get_group_id();
 $current_group = GroupManager::get_group_properties($group_id);
 $current_group_name = $current_group['name'];
 
-if (isset($group_id) && $group_id != '') {
+if (isset($group_id) && '' != $group_id) {
     $interbreadcrumb[] = [
         'url' => api_get_path(WEB_CODE_PATH).'group/group.php?'.api_get_cidreq(),
         'name' => get_lang('Groups'),
@@ -191,7 +189,7 @@ if (in_array(strtolower($pathinfo['extension']), $web_odf_supported_files)) {
 $isChatFolder = false;
 if (isset($document_data['parents']) && isset($document_data['parents'][0])) {
     $chatFolder = $document_data['parents'][0];
-    if (isset($chatFolder['path']) && $chatFolder['path'] == '/chat_files') {
+    if (isset($chatFolder['path']) && '/chat_files' == $chatFolder['path']) {
         $isChatFolder = true;
     }
 }
@@ -250,7 +248,7 @@ if ($show_web_odf) {
     echo '<div class="text-center">';
     $browser = api_get_navigator();
     $pdfUrl = api_get_path(WEB_LIBRARY_PATH).'javascript/ViewerJS/index.html#'.$file_url;
-    if ($browser['name'] == 'Mozilla' && preg_match('|.*\.pdf|i', $header_file)) {
+    if ('Mozilla' == $browser['name'] && preg_match('|.*\.pdf|i', $header_file)) {
         $pdfUrl = $file_url;
     }
     echo '<div id="viewerJS">';
diff --git a/public/main/document/slideshow.php b/public/main/document/slideshow.php
index a30f9f020d..cd1510c09b 100644
--- a/public/main/document/slideshow.php
+++ b/public/main/document/slideshow.php
@@ -7,8 +7,6 @@ use ChamiloSession as Session;
  * @author Patrick Cool patrick.cool@UGent.be Ghent University Mai 2004
  * @author Julio Montoya Lots of improvements, cleaning, adding security
  * @author Juan Carlos Raña Trabado herodoto@telefonica.net	January 2008
- *
- * @package chamilo.document
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -27,7 +25,7 @@ if (empty($slide_id)) {
     $edit_slide_id = $slide_id;
 }
 
-if ($path != '/') {
+if ('/' != $path) {
     $folder = $path.'/';
 } else {
     $folder = '/';
@@ -70,7 +68,7 @@ require 'document_slideshow.inc.php';
 
 // Calculating the current slide, next slide, previous slide and the number of slides
 $slide = null;
-if ($slide_id != 'all') {
+if ('all' != $slide_id) {
     $slide = $slide_id ? $slide_id : 0;
     $previous_slide = $slide - 1;
     $next_slide = $slide + 1;
@@ -79,7 +77,7 @@ $total_slides = count($image_files_only);
 
 echo '<div class="actions">';
 
-if ($slide_id != 'all') {
+if ('all' != $slide_id) {
     $image = null;
     if (isset($image_files_only[$slide])) {
         $image = $sys_course_path.$_course['path'].'/document'.$folder.$image_files_only[$slide];
@@ -87,7 +85,7 @@ if ($slide_id != 'all') {
     if (file_exists($image)) {
         echo '<div class="actions-pagination">';
         // Back forward buttons
-        if ($slide == 0) {
+        if (0 == $slide) {
             $imgp = 'action_prev_na.png';
             $first = Display::return_icon('action_first_na.png');
         } else {
@@ -144,7 +142,7 @@ echo Display::url(
 );
 
 // Show thumbnails
-if ($slide_id != 'all') {
+if ('all' != $slide_id) {
     echo '<a href="slideshow.php?slide_id=all&curdirpath='.$pathurl.'&'.api_get_cidreq().'">'.
         Display::return_icon('thumbnails.png', get_lang('Show Thumbnails'), '', ICON_SIZE_MEDIUM).'</a>';
 } else {
@@ -161,7 +159,7 @@ echo '<br />';
 if (isset($_POST['Submit'])) {
     // We come from slideshowoptions.php
     Session::write('image_resizing', Security::remove_XSS($_POST['radio_resizing']));
-    if ($_POST['radio_resizing'] == 'resizing' && $_POST['width'] != '' && $_POST['height'] != '') {
+    if ('resizing' == $_POST['radio_resizing'] && '' != $_POST['width'] && '' != $_POST['height']) {
         Session::write('image_resizing_width', Security::remove_XSS($_POST['width']));
         Session::write('image_resizing_height', Security::remove_XSS($_POST['height']));
     } else {
@@ -173,7 +171,7 @@ if (isset($_POST['Submit'])) {
 $target_width = $target_height = null;
 $imageResize = Session::read('image_resizing');
 // The target height and width depends if we choose resizing or no resizing
-if ($imageResize == 'resizing') {
+if ('resizing' == $imageResize) {
     $target_width = Session::read('image_resizing_width');
     $target_height = Session::read('image_resizing_height');
 }
@@ -182,7 +180,7 @@ if ($imageResize == 'resizing') {
 // This is for viewing all the images in the slideshow as thumbnails.
 $image_tag = [];
 $html = '';
-if ($slide_id == 'all') {
+if ('all' == $slide_id) {
     // Config for make thumbnails
     $allowed_thumbnail_types = ['jpg', 'jpeg', 'gif', 'png'];
     $max_thumbnail_width = 250;
@@ -252,13 +250,13 @@ if ($slide_id == 'all') {
                         $crop = imagecreatetruecolor($new_thumbnail_size['width'], $new_thumbnail_size['height']);
 
                         // preserve transparency
-                        if ($imagetype == 'png') {
+                        if ('png' == $imagetype) {
                             imagesavealpha($crop, true);
                             $color = imagecolorallocatealpha($crop, 0x00, 0x00, 0x00, 127);
                             imagefill($crop, 0, 0, $color);
                         }
 
-                        if ($imagetype == 'gif') {
+                        if ('gif' == $imagetype) {
                             $transindex = imagecolortransparent($source_img);
                             $palletsize = imagecolorstotal($source_img);
                             //GIF89a for transparent and anim (first clip), either GIF87a
@@ -310,11 +308,11 @@ if ($slide_id == 'all') {
                     }//end !exist thumbnail
                     //show thumbnail and link
                     $one_image_thumbnail_file = '.thumbs/.'.$one_image_file; //get path thumbnail
-                    $doc_url = ($path && $path !== '/') ? $path.'/'.$one_image_thumbnail_file : $path.$one_image_thumbnail_file;
+                    $doc_url = ($path && '/' !== $path) ? $path.'/'.$one_image_thumbnail_file : $path.$one_image_thumbnail_file;
                     $image_tag[] = '<img class="img-gallery" src="download.php?doc_url='.$doc_url.'" border="0" title="'.$one_image_file.'">';
                 } else {
                     // If images aren't support by gd (not gif, jpg, jpeg, png)
-                    if ($imagetype == 'bmp') {
+                    if ('bmp' == $imagetype) {
                         // use getimagesize instead api_getimagesize($image);
                         // because api_getimagesize doesn't support bmp files.
                         // Put here for each show, only for a few bmp files isn't heavy
@@ -341,7 +339,7 @@ if ($slide_id == 'all') {
                         $image_height = $max_thumbnail_height;
                     }
 
-                    $doc_url = ($path && $path !== '/') ? $path.'/'.$one_image_file : $path.$one_image_file;
+                    $doc_url = ($path && '/' !== $path) ? $path.'/'.$one_image_file : $path.$one_image_file;
                     $image_tag[] = '<img 
                             src="download.php?doc_url='.$doc_url.'"
                             border="0" 
@@ -386,19 +384,19 @@ echo $html;
 $course_id = api_get_course_int_id();
 
 // This is for viewing all the images in the slideshow one at a time.
-if ($slide_id != 'all' && !empty($image_files_only)) {
+if ('all' != $slide_id && !empty($image_files_only)) {
     if (file_exists($image) && is_file($image)) {
         $image_height_width = DocumentManager::resizeImageSlideShow($image, $target_width, $target_height);
         $image_height = $image_height_width[0];
         $image_width = $image_height_width[1];
         $height_width_tags = null;
-        if ($imageResize == 'resizing') {
+        if ('resizing' == $imageResize) {
             $height_width_tags = 'width="'.$image_width.'" height="'.$image_height.'"';
         }
 
         // This is done really quickly and should be cleaned up a little bit using the API functions
         $tbl_documents = Database::get_course_table(TABLE_DOCUMENT);
-        if ($path == '/') {
+        if ('/' == $path) {
             $pathpart = '/';
         } else {
             $pathpart = $path.'/';
@@ -411,19 +409,19 @@ if ($slide_id != 'all' && !empty($image_files_only)) {
         $row = Database::fetch_array($result);
 
         echo '<div class="thumbnail">';
-        if ($slide < $total_slides - 1 && $slide_id != 'all') {
+        if ($slide < $total_slides - 1 && 'all' != $slide_id) {
             echo "<a href='slideshow.php?slide_id=".$next_slide."&curdirpath=$pathurl'>";
         } else {
             echo "<a href='slideshow.php?slide_id=0&curdirpath=$pathurl'>";
         }
 
-        if ($path == '/') {
+        if ('/' == $path) {
             $path = '';
         }
 
         list($width, $height) = getimagesize($image);
         // Auto resize
-        if ($imageResize == 'resizing') {
+        if ('resizing' == $imageResize) {
             ?>
         <script>
             var initial_width='<?php echo $width; ?>';
@@ -489,11 +487,11 @@ if ($slide_id != 'all' && !empty($image_files_only)) {
             echo '<ul class="list-unstyled">';
             $aux = explode('.', htmlspecialchars($image_files_only[$slide]));
             $ext = $aux[count($aux) - 1];
-            if ($imageResize == 'resizing') {
+            if ('resizing' == $imageResize) {
                 $resize_info = get_lang('RESIZE').'<br />';
                 $resize_width = Session::read('image_resizing_width').' x ';
                 $resize_height = Session::read('image_resizing_height');
-            } elseif ($imageResize != 'noresizing') {
+            } elseif ('noresizing' != $imageResize) {
                 $resize_info = get_lang('RESIZE').'<br />';
                 $resize_width = get_lang('Auto').' x ';
                 $resize_height = get_lang('Auto');
@@ -530,7 +528,7 @@ if ($slide_id != 'all' && !empty($image_files_only)) {
         echo Display::return_message(get_lang('The file was not found'), 'warning');
     }
 } else {
-    if ($slide_id != 'all') {
+    if ('all' != $slide_id) {
         echo Display::return_message(get_lang('No data available'), 'warning');
     }
 }
diff --git a/public/main/document/slideshowoptions.php b/public/main/document/slideshowoptions.php
index 4acf27559c..abf533529f 100644
--- a/public/main/document/slideshowoptions.php
+++ b/public/main/document/slideshowoptions.php
@@ -5,9 +5,6 @@ use ChamiloSession as Session;
 
 /**
  * @author Patrick Cool
- *
- * @package chamilo.document
- *
  * @author Patrick Cool, patrick.cool@UGent.be, Ghent University, May 2004, http://icto.UGent.be
  * Please bear in mind that this is only an beta release.
  * I wrote this quite quick and didn't think too much about it in advance.
@@ -61,7 +58,7 @@ function disableresizing() { //v2.0
     document.options.height.disabled=true;
     //document.options.height.className='disabled_input';
 }
-window.onload = <?php echo $image_resizing == 'resizing' ? 'enableresizing' : 'disableresizing'; ?>;
+window.onload = <?php echo 'resizing' == $image_resizing ? 'enableresizing' : 'disableresizing'; ?>;
 </script>
 
 <?php
@@ -76,7 +73,7 @@ echo Display::toolbarAction('toolbar-slideshow', [$actions]);
         <div class="radio">
             <label>
                 <input name="radio_resizing" type="radio" onClick="disableresizing()" value="noresizing" <?php
-                    if ($image_resizing == 'noresizing' || $image_resizing == '') {
+                    if ('noresizing' == $image_resizing || '' == $image_resizing) {
                         echo ' checked';
                     }
         ?>>
@@ -86,7 +83,7 @@ echo Display::toolbarAction('toolbar-slideshow', [$actions]);
         <div class="radio">
             <label>
                 <input name="radio_resizing" type="radio" onClick="disableresizing()" value="autoresizing" <?php
-                if ($image_resizing == 'resizing_auto' || $image_resizing == '') {
+                if ('resizing_auto' == $image_resizing || '' == $image_resizing) {
                     echo ' checked';
                 }
         ?>>
@@ -96,7 +93,7 @@ echo Display::toolbarAction('toolbar-slideshow', [$actions]);
 	<div class="radio">
             <label>
                 <input class="checkbox" name="radio_resizing" type="radio" onClick="javascript: enableresizing();" value="resizing" <?php
-                if ($image_resizing == 'resizing') {
+                if ('resizing' == $image_resizing) {
                     echo ' checked';
                     $width = Session::read('image_resizing_width');
                     $height = Session::read('image_resizing_height');
@@ -109,7 +106,7 @@ echo Display::toolbarAction('toolbar-slideshow', [$actions]);
             <label class="col-sm-1 control-label"><?php echo get_lang('Width'); ?></label>
             <div class="col-sm-3">
                 <input class="form-control" name="width" type="text" id="width" <?php
-        if ($image_resizing == 'resizing') {
+        if ('resizing' == $image_resizing) {
             echo ' value="'.$width.'"';
             echo ' class="enabled_input"';
         } else {
@@ -123,7 +120,7 @@ echo Display::toolbarAction('toolbar-slideshow', [$actions]);
             <label class="col-sm-1 control-label"><?php echo get_lang('Height'); ?></label>
             <div class="col-sm-3">
                 <input class="form-control" name="height" type="text" id="height" <?php
-        if ($image_resizing == 'resizing') {
+        if ('resizing' == $image_resizing) {
             echo ' value="'.$height.'"';
             echo ' class="enabled_input"';
         } else {
diff --git a/public/main/document/upload.php b/public/main/document/upload.php
index e439179376..5a9914b5c0 100644
--- a/public/main/document/upload.php
+++ b/public/main/document/upload.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.document
- */
 use Chamilo\CoreBundle\Framework\Container;
 
 require_once __DIR__.'/../inc/global.inc.php';
@@ -34,7 +31,7 @@ if (isset($_REQUEST['id'])) {
         $sessionId
     );
 
-    if ($sessionId != 0 && !$document_data) {
+    if (0 != $sessionId && !$document_data) {
         $document_data = DocumentManager::get_document_data_by_id(
             $_REQUEST['id'],
             api_get_course_id(),
@@ -97,7 +94,7 @@ if (!empty($groupId)) {
 }
 
 // Group docs can only be uploaded in the group directory
-if ($groupId != 0 && $path == '/') {
+if (0 != $groupId && '/' == $path) {
     $path = $group_properties['directory'];
 }
 
@@ -105,13 +102,13 @@ if ($groupId != 0 && $path == '/') {
 $is_certificate_mode = false;
 $is_certificate_array = explode('/', $path);
 array_shift($is_certificate_array);
-if ($is_certificate_array[0] == 'certificates') {
+if ('certificates' == $is_certificate_array[0]) {
     $is_certificate_mode = true;
 }
 
 // Title of the tool
 $add_group_to_title = null;
-if ($groupId != 0) {
+if (0 != $groupId) {
     // Add group name after for group documents
     $add_group_to_title = ' ('.$group_properties['name'].')';
 }
@@ -256,7 +253,7 @@ $form->addElement(
     'onclick="javascript: check_unzip();" value="1"'
 );
 
-if (api_get_setting('search_enabled') === 'true') {
+if ('true' === api_get_setting('search_enabled')) {
     //TODO: include language file
     $supportedFormats = get_lang('Supported formats for index').': HTML, PDF, TXT, PDF, Postscript, MS Word, RTF, MS Power Point';
     $form->addElement(
diff --git a/public/main/document/webcam_clip.php b/public/main/document/webcam_clip.php
index d1e64bafdf..110e9bccd8 100644
--- a/public/main/document/webcam_clip.php
+++ b/public/main/document/webcam_clip.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * This file allows record wav files.
  *
- * @package chamilo.document
- *
  * @author  Juan Carlos Raña Trabado herodoto@telefonica.net
  *
  * @since   7/jun/2012
@@ -48,7 +46,7 @@ $dir = $documentData['path'];
 
 //make some vars
 $webcamdir = $dir;
-if ($webcamdir == "/") {
+if ("/" == $webcamdir) {
     $webcamdir = '';
 }
 
@@ -59,15 +57,15 @@ if (strstr($dir, '..')) {
     $dir = '/';
 }
 
-if ($dir[0] == '.') {
+if ('.' == $dir[0]) {
     $dir = substr($dir, 1);
 }
 
-if ($dir[0] != '/') {
+if ('/' != $dir[0]) {
     $dir = '/'.$dir;
 }
 
-if ($dir[strlen($dir) - 1] != '/') {
+if ('/' != $dir[strlen($dir) - 1]) {
     $dir .= '/';
 }
 
@@ -123,7 +121,7 @@ if (isset($documentData['parents'])) {
     foreach ($documentData['parents'] as $documentSubData) {
         //fixing double group folder in breadcrumb
         if ($groupId) {
-            if ($counter == 0) {
+            if (0 == $counter) {
                 $counter++;
                 continue;
             }
diff --git a/public/main/document/webcam_receiver.php b/public/main/document/webcam_receiver.php
index 1ec9dbf6bd..f659925e72 100644
--- a/public/main/document/webcam_receiver.php
+++ b/public/main/document/webcam_receiver.php
@@ -22,7 +22,7 @@ if (isset($params['webcamname']) && isset($params['webcamdir']) && isset($params
     die();
 }
 
-if ($webcamuserid != api_get_user_id() || api_get_user_id() == 0 || $webcamuserid == 0) {
+if ($webcamuserid != api_get_user_id() || 0 == api_get_user_id() || 0 == $webcamuserid) {
     api_not_allowed();
     die();
 }
@@ -39,7 +39,7 @@ $webcamdir = Security::remove_XSS($webcamdir);
 $ext = explode('.', $webcamname);
 $ext = strtolower($ext[sizeof($ext) - 1]);
 
-if ($ext != 'jpg') {
+if ('jpg' != $ext) {
     die();
 }
 
diff --git a/public/main/dropbox/dropbox_class.inc.php b/public/main/dropbox/dropbox_class.inc.php
index 6acc9fa971..c6c7c82113 100644
--- a/public/main/dropbox/dropbox_class.inc.php
+++ b/public/main/dropbox/dropbox_class.inc.php
@@ -39,8 +39,6 @@
  * @copyright 2004
  * @author Jan Bols <jan@ivpv.UGent.be>
  * with contributions by René Haentjens <rene.haentjens@UGent.be>
- *
- * @package chamilo.dropbox
  */
 class Dropbox_Work
 {
@@ -163,7 +161,7 @@ class Dropbox_Work
                 WHERE c_id = $course_id AND file_id = ".intval($this->id)." AND user_id = ".$this->uploader_id;
         $result = Database::query($sql);
         $row = Database::fetch_array($result);
-        if ($row['count'] == 0) {
+        if (0 == $row['count']) {
             // Insert entries into person table
             $sql = "INSERT INTO ".Database::get_course_table(TABLE_DROPBOX_PERSON)." (c_id, file_id, user_id)
                     VALUES ($course_id, ".intval($this->id)." , ".intval($this->uploader_id).")";
@@ -213,7 +211,7 @@ class Dropbox_Work
         $this->category = $res['cat_id'];
 
         // Getting the feedback on the work.
-        if ($action == 'viewfeedback' && $this->id == $_GET['id']) {
+        if ('viewfeedback' == $action && $this->id == $_GET['id']) {
             $feedback2 = [];
             $sql = "SELECT * FROM ".Database::get_course_table(TABLE_DROPBOX_FEEDBACK)."
                     WHERE c_id = $course_id AND file_id='".$id."' 
@@ -319,12 +317,12 @@ class Dropbox_SentWork extends Dropbox_Work
         if (is_int($recipient_ids)) {
             $justSubmit = true;
             $recipient_ids = [$recipient_ids + $this->id];
-        } elseif (count($recipient_ids) == 0) {
+        } elseif (0 == count($recipient_ids)) {
             $justSubmit = true;
             $recipient_ids = [$uploader_id];
         }
 
-        if (!is_array($recipient_ids) || count($recipient_ids) == 0) {
+        if (!is_array($recipient_ids) || 0 == count($recipient_ids)) {
             die(get_lang('An error has occured. Please contact your system administrator.').' (code 209)');
         }
 
diff --git a/public/main/dropbox/dropbox_download.php b/public/main/dropbox/dropbox_download.php
index b2a67e1553..b8bf7e89e6 100644
--- a/public/main/dropbox/dropbox_download.php
+++ b/public/main/dropbox/dropbox_download.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.dropbox
- */
+
 require_once __DIR__.'/../inc/global.inc.php';
 
 $_course = api_get_course_info();
@@ -16,7 +14,7 @@ $user_id = api_get_user_id();
 
 if (isset($_GET['cat_id']) &&
     is_numeric($_GET['cat_id']) &&
-    $_GET['action'] == 'downloadcategory' &&
+    'downloadcategory' == $_GET['action'] &&
     isset($_GET['sent_received'])
 ) {
     /** step 1: constructing the sql statement.
@@ -25,7 +23,7 @@ if (isset($_GET['cat_id']) &&
     It would have been more elegant if these could be stored in dropbox_person (which stores the link file-person)
     Therefore we have to create to separate sql statements to find which files are in the category
     (depending if we zip-download a sent category or a received category)*/
-    if ($_GET['sent_received'] == 'sent') {
+    if ('sent' == $_GET['sent_received']) {
         // here we also incorporate the person table to make sure that deleted sent documents are not included.
         $sql = "SELECT DISTINCT file.id, file.filename, file.title
                 FROM ".Database::get_course_table(TABLE_DROPBOX_FILE)." file
@@ -37,7 +35,7 @@ if (isset($_GET['cat_id']) &&
                     person.user_id = $user_id";
     }
 
-    if ($_GET['sent_received'] == 'received') {
+    if ('received' == $_GET['sent_received']) {
         $sql = "SELECT DISTINCT file.id, file.filename, file.title
                 FROM ".Database::get_course_table(TABLE_DROPBOX_FILE)." file
                 INNER JOIN ".Database::get_course_table(TABLE_DROPBOX_PERSON)." person
@@ -102,7 +100,7 @@ if (!$allowed_to_download) {
     }
     $file = $work->title;
     $result = DocumentManager::file_send_for_download($path, true, $file);
-    if ($result === false) {
+    if (false === $result) {
         api_not_allowed(true);
     }
     exit;
diff --git a/public/main/dropbox/dropbox_functions.inc.php b/public/main/dropbox/dropbox_functions.inc.php
index ea0fad8dcf..0159affcc7 100644
--- a/public/main/dropbox/dropbox_functions.inc.php
+++ b/public/main/dropbox/dropbox_functions.inc.php
@@ -37,9 +37,9 @@ function handle_multiple_actions()
     $is_courseTutor = api_is_course_tutor();
 
     // STEP 1: are we performing the actions on the received or on the sent files?
-    if ($_POST['action'] == 'delete_received' || $_POST['action'] == 'download_received') {
+    if ('delete_received' == $_POST['action'] || 'download_received' == $_POST['action']) {
         $part = 'received';
-    } elseif ($_POST['action'] == 'delete_sent' || $_POST['action'] == 'download_sent') {
+    } elseif ('delete_sent' == $_POST['action'] || 'download_sent' == $_POST['action']) {
         $part = 'sent';
     }
 
@@ -49,7 +49,7 @@ function handle_multiple_actions()
         $checked_file_ids = $_POST['id'];
     } else {
         foreach ($_POST as $key => $value) {
-            if (strstr($value, $part.'_') && $key != 'view_received_category' && $key != 'view_sent_category') {
+            if (strstr($value, $part.'_') && 'view_received_category' != $key && 'view_sent_category' != $key) {
                 $checked_files = true;
                 $checked_file_ids[] = intval(substr($value, strrpos($value, '_')));
             }
@@ -57,19 +57,19 @@ function handle_multiple_actions()
     }
     $checked_file_ids = $_POST['id'];
 
-    if (!is_array($checked_file_ids) || count($checked_file_ids) == 0) {
+    if (!is_array($checked_file_ids) || 0 == count($checked_file_ids)) {
         return get_lang('Check at least one file.');
     }
 
     // Deleting
-    if ($_POST['action'] == 'delete_received' || $_POST['action'] == 'delete_sent') {
+    if ('delete_received' == $_POST['action'] || 'delete_sent' == $_POST['action']) {
         $dropboxfile = new Dropbox_Person($_user['user_id'], $is_courseAdmin, $is_courseTutor);
         foreach ($checked_file_ids as $key => $value) {
-            if ($_GET['view'] == 'received') {
+            if ('received' == $_GET['view']) {
                 $dropboxfile->deleteReceivedWork($value);
                 $message = get_lang('The received file has been deleted.');
             }
-            if ($_GET['view'] == 'sent' || empty($_GET['view'])) {
+            if ('sent' == $_GET['view'] || empty($_GET['view'])) {
                 $dropboxfile->deleteSentWork($value);
                 $message = get_lang('The sent file has been deleted.');
             }
@@ -97,7 +97,7 @@ function handle_multiple_actions()
     }
 
     // STEP 3D: downloading
-    if ($_POST['action'] == 'download_sent' || $_POST['action'] == 'download_received') {
+    if ('download_sent' == $_POST['action'] || 'download_received' == $_POST['action']) {
         zip_download($checked_file_ids);
     }
 }
@@ -133,7 +133,7 @@ function delete_category($action, $id, $user_id = null)
     }
 
     $cat = get_dropbox_category($id);
-    if (count($cat) == 0) {
+    if (0 == count($cat)) {
         return false;
     }
 
@@ -142,12 +142,12 @@ function delete_category($action, $id, $user_id = null)
     }
 
     // an additional check that might not be necessary
-    if ($action == 'deletereceivedcategory') {
+    if ('deletereceivedcategory' == $action) {
         $sentreceived = 'received';
         $entries_table = Database::get_course_table(TABLE_DROPBOX_POST);
         $id_field = 'file_id';
         $return_message = get_lang('The folder has been deleted');
-    } elseif ($action == 'deletesentcategory') {
+    } elseif ('deletesentcategory' == $action) {
         $sentreceived = 'sent';
         $entries_table = Database::get_course_table(TABLE_DROPBOX_FILE);
         $id_field = 'id';
@@ -168,10 +168,10 @@ function delete_category($action, $id, $user_id = null)
 
     while ($row = Database::fetch_array($result)) {
         $dropboxfile = new Dropbox_Person($user_id, $is_courseAdmin, $is_courseTutor);
-        if ($action == 'deletereceivedcategory') {
+        if ('deletereceivedcategory' == $action) {
             $dropboxfile->deleteReceivedWork($row[$id_field]);
         }
-        if ($action == 'deletesentcategory') {
+        if ('deletesentcategory' == $action) {
             $dropboxfile->deleteSentWork($row[$id_field]);
         }
     }
@@ -231,11 +231,11 @@ function store_move($id, $target, $part)
     $_user = api_get_user_info();
     $course_id = api_get_course_int_id();
 
-    if ((isset($id) && $id != '') &&
-        (isset($target) && $target != '') &&
-        (isset($part) && $part != '')
+    if ((isset($id) && '' != $id) &&
+        (isset($target) && '' != $target) &&
+        (isset($part) && '' != $part)
     ) {
-        if ($part == 'received') {
+        if ('received' == $part) {
             $sql = "UPDATE ".Database::get_course_table(TABLE_DROPBOX_POST)."
                     SET cat_id = ".intval($target)."
                     WHERE c_id = $course_id AND dest_user_id = ".intval($_user['user_id'])."
@@ -243,7 +243,7 @@ function store_move($id, $target, $part)
             Database::query($sql);
             $return_message = get_lang('The received file has been moved.');
         }
-        if ($part == 'sent') {
+        if ('sent' == $part) {
             $sql = "UPDATE ".Database::get_course_table(TABLE_DROPBOX_FILE)."
                     SET cat_id = ".intval($target)."
                     WHERE
@@ -285,8 +285,8 @@ function get_dropbox_categories($filter = '')
 
     $result = Database::query($sql);
     while ($row = Database::fetch_array($result)) {
-        if (($filter == 'sent' && $row['sent'] == 1) ||
-            ($filter == 'received' && $row['received'] == 1) || $filter == ''
+        if (('sent' == $filter && 1 == $row['sent']) ||
+            ('received' == $filter && 1 == $row['received']) || '' == $filter
         ) {
             $return_array[$row['cat_id']] = $row;
         }
@@ -314,7 +314,7 @@ function get_dropbox_category($id)
     $sql = "SELECT * FROM ".Database::get_course_table(TABLE_DROPBOX_CATEGORY)."
             WHERE c_id = $course_id AND cat_id='".$id."'";
     $res = Database::query($sql);
-    if ($res === false) {
+    if (false === $res) {
         return [];
     }
     $row = Database::fetch_assoc($res);
@@ -344,10 +344,10 @@ function store_addcategory()
     $_user = api_get_user_info();
 
     // check if the target is valid
-    if ($_POST['target'] == 'sent') {
+    if ('sent' == $_POST['target']) {
         $sent = 1;
         $received = 0;
-    } elseif ($_POST['target'] == 'received') {
+    } elseif ('received' == $_POST['target']) {
         $sent = 0;
         $received = 1;
     } else {
@@ -355,7 +355,7 @@ function store_addcategory()
     }
 
     // check if the category name is valid
-    if ($_POST['category_name'] == '') {
+    if ('' == $_POST['category_name']) {
         return ['type' => 'error', 'message' => get_lang('Please give a category name')];
     }
 
@@ -373,7 +373,7 @@ function store_addcategory()
         $result = Database::query($sql);
 
         // step 3b, we add the category if it does not exist yet.
-        if (Database::num_rows($result) == 0) {
+        if (0 == Database::num_rows($result)) {
             $params = [
                 'cat_id' => 0,
                 'c_id' => $course_id,
@@ -447,25 +447,25 @@ function display_addcategory_form($category_name = '', $id = 0, $action = '')
             // (happens when createinrecievedfiles AND createinsentfiles are not checked)
             $category_name = $row['cat_name'];
         }
-        if ($row['received'] == '1') {
+        if ('1' == $row['received']) {
             $target = 'received';
         }
-        if ($row['sent'] == '1') {
+        if ('1' == $row['sent']) {
             $target = 'sent';
         }
         $title = get_lang('Edit this category');
     }
 
-    if ($action == 'addreceivedcategory') {
+    if ('addreceivedcategory' == $action) {
         $target = 'received';
     }
-    if ($action == 'addsentcategory') {
+    if ('addsentcategory' == $action) {
         $target = 'sent';
     }
 
-    if ($action == 'editcategory') {
+    if ('editcategory' == $action) {
         $text = get_lang('Edit category');
-    } elseif ($action == 'addreceivedcategory' || $action == 'addsentcategory') {
+    } elseif ('addreceivedcategory' == $action || 'addsentcategory' == $action) {
         $text = get_lang('Create category');
     }
 
@@ -547,7 +547,7 @@ function display_add_form($viewReceivedCategory, $viewSentCategory, $view, $id =
     );
 
     $allowOverwrite = api_get_setting('dropbox_allow_overwrite');
-    if ($allowOverwrite == 'true' && empty($idCondition)) {
+    if ('true' == $allowOverwrite && empty($idCondition)) {
         $form->addElement(
             'checkbox',
             'cb_overwrite',
@@ -560,7 +560,7 @@ function display_add_form($viewReceivedCategory, $viewSentCategory, $view, $id =
     // List of all users in this course and all virtual courses combined with it
     if (api_get_session_id()) {
         $complete_user_list_for_dropbox = [];
-        if (api_get_setting('dropbox_allow_student_to_student') == 'true' || $_user['status'] != STUDENT) {
+        if ('true' == api_get_setting('dropbox_allow_student_to_student') || STUDENT != $_user['status']) {
             $complete_user_list_for_dropbox = CourseManager:: get_user_list_from_course_code(
                 $course_info['code'],
                 api_get_session_id(),
@@ -585,7 +585,7 @@ function display_add_form($viewReceivedCategory, $viewSentCategory, $view, $id =
         $generalCoachList = [];
         $courseCoachList = [];
         foreach ($complete_user_list2 as $coach) {
-            if ($coach['type'] == 'general_coach') {
+            if ('general_coach' == $coach['type']) {
                 $generalCoachList[] = $coach;
             } else {
                 $courseCoachList[] = $coach;
@@ -593,7 +593,7 @@ function display_add_form($viewReceivedCategory, $viewSentCategory, $view, $id =
         }
 
         $hideCourseCoach = api_get_setting('dropbox_hide_course_coach');
-        if ($hideCourseCoach == 'false') {
+        if ('false' == $hideCourseCoach) {
             $complete_user_list_for_dropbox = array_merge(
                 $complete_user_list_for_dropbox,
                 $courseCoachList
@@ -601,14 +601,14 @@ function display_add_form($viewReceivedCategory, $viewSentCategory, $view, $id =
         }
         $hideGeneralCoach = api_get_setting('dropbox_hide_general_coach');
 
-        if ($hideGeneralCoach == 'false') {
+        if ('false' == $hideGeneralCoach) {
             $complete_user_list_for_dropbox = array_merge(
                 $complete_user_list_for_dropbox,
                 $generalCoachList
             );
         }
     } else {
-        if (api_get_setting('dropbox_allow_student_to_student') == 'true' || $_user['status'] != STUDENT) {
+        if ('true' == api_get_setting('dropbox_allow_student_to_student') || STUDENT != $_user['status']) {
             $complete_user_list_for_dropbox = CourseManager::get_user_list_from_course_code(
                 $course_info['code'],
                 api_get_session_id(),
@@ -655,16 +655,16 @@ function display_add_form($viewReceivedCategory, $viewSentCategory, $view, $id =
         if ((
             $dropbox_person->isCourseTutor
                 || $dropbox_person->isCourseAdmin
-                || $allowStudentToStudent == 'true'
-                || $current_user['status'] != 5                         // Always allow teachers.
-                || $current_user['is_tutor'] == 1                       // Always allow tutors.
+                || 'true' == $allowStudentToStudent
+                || 5 != $current_user['status']                         // Always allow teachers.
+                || 1 == $current_user['is_tutor']                       // Always allow tutors.
                 ) && $current_user['user_id'] != $_user['user_id']) {   // Don't include yourself.
             if ($current_user['user_id'] == $current_user_id) {
                 continue;
             }
             $userId = $current_user['user_id'];
             $userInfo = api_get_user_info($userId);
-            if ($userInfo['status'] != INVITEE) {
+            if (INVITEE != $userInfo['status']) {
                 $groupNameListToString = '';
                 if (!empty($groups)) {
                     $groupNameList = array_column($groups, 'name');
@@ -684,7 +684,7 @@ function display_add_form($viewReceivedCategory, $viewSentCategory, $view, $id =
     */
     $allowGroups = api_get_setting('dropbox_allow_group');
     if (($dropbox_person->isCourseTutor || $dropbox_person->isCourseAdmin)
-        && $allowGroups == 'true' || $allowStudentToStudent == 'true'
+        && 'true' == $allowGroups || 'true' == $allowStudentToStudent
     ) {
         $complete_group_list_for_dropbox = GroupManager::get_group_list(null, $course_info);
 
@@ -698,7 +698,7 @@ function display_add_form($viewReceivedCategory, $viewSentCategory, $view, $id =
     }
 
     $allowUpload = api_get_setting('dropbox_allow_just_upload');
-    if ($allowUpload == 'true') {
+    if ('true' == $allowUpload) {
         $options['user_'.$_user['user_id']] = get_lang('---Just upload---');
     }
 
@@ -817,7 +817,7 @@ function getUserOwningThisMailing($mailingPseudoId, $owner = 0, $or_die = '')
     if (!($res = Database::fetch_array($result))) {
         die(get_lang('An error has occured. Please contact your system administrator.').' (code 901)');
     }
-    if ($owner == 0) {
+    if (0 == $owner) {
         return $res['uploader_id'];
     }
     if ($res['uploader_id'] == $owner) {
@@ -887,11 +887,11 @@ function store_add_dropbox($file = [], $work = null)
             $thisIsJustUpload = false;
 
             foreach ($_POST['recipients'] as $rec) {
-                if ($rec == 'mailing') {
+                if ('mailing' == $rec) {
                     $thisIsAMailing = true;
-                } elseif ($rec == 'upload') {
+                } elseif ('upload' == $rec) {
                     $thisIsJustUpload = true;
-                } elseif (strpos($rec, 'user_') === 0 &&
+                } elseif (0 === strpos($rec, 'user_') &&
                     !CourseManager::is_user_subscribed_in_course(
                         substr($rec, strlen('user_')),
                         $_course['code'],
@@ -906,7 +906,7 @@ function store_add_dropbox($file = [], $work = null)
                     );
 
                     return false;
-                } elseif (strpos($rec, 'group_') !== 0 && strpos($rec, 'user_') !== 0) {
+                } elseif (0 !== strpos($rec, 'group_') && 0 !== strpos($rec, 'user_')) {
                     Display::addFlash(
                         Display::return_message(
                             get_lang('Invalid group detected.'),
@@ -920,7 +920,7 @@ function store_add_dropbox($file = [], $work = null)
         }
 
         // we are doing a mailing but an additional recipient is selected
-        if ($thisIsAMailing && (count($_POST['recipients']) != 1)) {
+        if ($thisIsAMailing && (1 != count($_POST['recipients']))) {
             Display::addFlash(
                 Display::return_message(
                     get_lang('Mailing cannot be combined with other recipients'),
@@ -934,7 +934,7 @@ function store_add_dropbox($file = [], $work = null)
         // we are doing a just upload but an additional recipient is selected.
         // note: why can't this be valid? It is like sending a document to
         // yourself AND to a different person (I do this quite often with my e-mails)
-        if ($thisIsJustUpload && (count($_POST['recipients']) != 1)) {
+        if ($thisIsJustUpload && (1 != count($_POST['recipients']))) {
             Display::addFlash(
                 Display::return_message(
                     get_lang('Just Upload cannot be combined with other recipients'),
@@ -1040,9 +1040,9 @@ function store_add_dropbox($file = [], $work = null)
         // creating the array that contains all the users who will receive the file
         $new_work_recipients = [];
         foreach ($_POST['recipients'] as $rec) {
-            if (strpos($rec, 'user_') === 0) {
+            if (0 === strpos($rec, 'user_')) {
                 $new_work_recipients[] = substr($rec, strlen('user_'));
-            } elseif (strpos($rec, 'group_') === 0) {
+            } elseif (0 === strpos($rec, 'group_')) {
                 $groupInfo = GroupManager::get_group_properties(substr($rec, strlen('group_')));
                 $userList = GroupManager::get_subscribed_users($groupInfo);
                 foreach ($userList as $usr) {
@@ -1353,7 +1353,7 @@ function zip_download($fileList)
     Session::erase('dropbox_files_to_download');
     $name = 'dropbox-'.api_get_utc_datetime().'.zip';
     $result = DocumentManager::file_send_for_download($temp_zip_file, true, $name);
-    if ($result === false) {
+    if (false === $result) {
         api_not_allowed(true);
     }
     @unlink($temp_zip_file);
@@ -1402,7 +1402,7 @@ function generate_html_overview($files, $dont_show_columns = [], $make_link = []
     $counter = 0;
     foreach ($files as $value) {
         // Adding the header.
-        if ($counter == 0) {
+        if (0 == $counter) {
             $columns_array = array_keys($value);
             $return .= "\n<tr>";
             foreach ($columns_array as $columns_array_key => $columns_array_value) {
diff --git a/public/main/dropbox/dropbox_init.inc.php b/public/main/dropbox/dropbox_init.inc.php
index 69e255920f..fba67de5e1 100644
--- a/public/main/dropbox/dropbox_init.inc.php
+++ b/public/main/dropbox/dropbox_init.inc.php
@@ -14,8 +14,6 @@ use ChamiloSession as Session;
  * @author Roan Embrechts, virtual course support
  * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University (see history version 1.3)
  *
- * @package chamilo.dropbox
- *
  * @todo complete refactoring. Currently there are about at least 3 sql queries needed for every individual dropbox document.
  *  first we find all the documents that were sent (resp. received) by the user
  *   then for every individual document the user(s)information who received (resp. sent) the document is searched
@@ -107,8 +105,6 @@ Version 1.1
  * download file / folder (download icon)
  * same action on multiple documents
  * extended feedback
- *
- * @package chamilo.dropbox
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $is_allowed_in_course = api_is_allowed_in_course();
@@ -155,7 +151,7 @@ if (empty($session_id)) {
 // off all the documents that have already been sent.
 // @todo consider moving the javascripts in a function that displays the javascripts
 // only when it is needed.
-if ($action == 'add') {
+if ('add' == $action) {
     $dropbox_person = new Dropbox_Person(
         $user_id,
         $is_courseAdmin,
@@ -200,7 +196,7 @@ function checkForm (frm)
 ";
 
 $allowOverwrite = api_get_setting('dropbox_allow_overwrite');
-if ($allowOverwrite == 'true') {
+if ('true' == $allowOverwrite) {
     //sentArray keeps list of all files still available in the sent files list
     //of the user.
     //This is used to show or hide the overwrite file-radio button of the upload form
@@ -284,7 +280,7 @@ $(function () {
 });
 </script>";
 $checked_files = false;
-if (!$view || $view == 'received') {
+if (!$view || 'received' == $view) {
     $part = 'received';
 } elseif ($view = 'sent') {
     $part = 'sent';
@@ -293,9 +289,9 @@ if (!$view || $view == 'received') {
     exit;
 }
 
-if (($postAction == 'download_received' || $postAction == 'download_sent') and !$_POST['store_feedback']) {
+if (('download_received' == $postAction || 'download_sent' == $postAction) and !$_POST['store_feedback']) {
     $checked_file_ids = $_POST['id'];
-    if (!is_array($checked_file_ids) || count($checked_file_ids) == 0) {
+    if (!is_array($checked_file_ids) || 0 == count($checked_file_ids)) {
         header('Location: index.php?'.api_get_cidreq().'&view='.$view.'&error=CheckAtLeastOneFile');
     } else {
         handle_multiple_actions();
@@ -310,7 +306,7 @@ if (($postAction == 'download_received' || $postAction == 'download_sent') and !
 if ((!$is_allowed_in_course || !$is_course_member) &&
     !api_is_allowed_to_edit(null, true)
 ) {
-    if ($origin != 'learnpath') {
+    if ('learnpath' != $origin) {
         api_not_allowed(true); //print headers/footers
     } else {
         api_not_allowed();
@@ -319,14 +315,14 @@ if ((!$is_allowed_in_course || !$is_course_member) &&
 }
 
 /*	BREADCRUMBS */
-if ($view == 'received') {
+if ('received' == $view) {
     $interbreadcrumb[] = [
         'url' => api_get_path(WEB_CODE_PATH).'dropbox/index.php?'.api_get_cidreq(),
         'name' => get_lang('Dropbox'),
     ];
     $nameTools = get_lang('Received Files');
 
-    if ($action == 'addreceivedcategory') {
+    if ('addreceivedcategory' == $action) {
         $interbreadcrumb[] = [
             'url' => api_get_path(WEB_CODE_PATH).'dropbox/index.php?view=received&'.api_get_cidreq(),
             'name' => get_lang('Received Files'),
@@ -335,25 +331,25 @@ if ($view == 'received') {
     }
 }
 
-if ($view == 'sent' || empty($view)) {
+if ('sent' == $view || empty($view)) {
     $interbreadcrumb[] = [
         'url' => api_get_path(WEB_CODE_PATH).'dropbox/index.php?'.api_get_cidreq(),
         'name' => get_lang('Dropbox'),
     ];
     $nameTools = get_lang('Sent Files');
 
-    if ($action == 'addsentcategory') {
+    if ('addsentcategory' == $action) {
         $interbreadcrumb[] = [
             'url' => api_get_path(WEB_CODE_PATH).'dropbox/index.php?view=sent&'.api_get_cidreq(),
             'name' => get_lang('Sent Files'),
         ];
         $nameTools = get_lang('Add a new folder');
     }
-    if ($action == 'add') {
+    if ('add' == $action) {
         $nameTools = get_lang('Share a new file');
     }
 
-    if ($action == 'update') {
+    if ('update' == $action) {
         $interbreadcrumb[] = [
             'url' => api_get_path(WEB_CODE_PATH).'dropbox/index.php?view=sent&'.api_get_cidreq(),
             'name' => get_lang('Sent Files'),
@@ -363,7 +359,7 @@ if ($view == 'sent' || empty($view)) {
 }
 
 /*	HEADER & TITLE */
-if (isset($origin) && $origin == 'learnpath') {
+if (isset($origin) && 'learnpath' == $origin) {
     $htmlHeadXtra[] = $javascript;
     Display::display_reduced_header($nameTools, 'Dropbox');
 } else {
diff --git a/public/main/dropbox/index.php b/public/main/dropbox/index.php
index a68d9ac03d..1dacdc055f 100644
--- a/public/main/dropbox/index.php
+++ b/public/main/dropbox/index.php
@@ -9,7 +9,7 @@ $_course = api_get_course_info();
 $last_access = '';
 // get the last time the user accessed the tool
 if (isset($_SESSION[$_course['id']]) &&
-    $_SESSION[$_course['id']]['last_access'][TOOL_DROPBOX] == ''
+    '' == $_SESSION[$_course['id']]['last_access'][TOOL_DROPBOX]
 ) {
     $last_access = get_last_tool_access(TOOL_DROPBOX);
     $_SESSION[$_course['id']]['last_access'][TOOL_DROPBOX] = $last_access;
@@ -58,8 +58,8 @@ if (isset($_GET['dropbox_direction']) && in_array($_GET['dropbox_direction'], ['
 $sort_params = Security::remove_XSS(implode('&', $sort_params));
 
 // Display the form for adding a new dropbox item.
-if ($action == 'add') {
-    if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+if ('add' == $action) {
+    if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
         api_not_allowed();
     }
     display_add_form(
@@ -77,8 +77,8 @@ if (isset($_POST['submitWork'])) {
 }
 
 // Display the form for adding a category
-if ($action == 'addreceivedcategory' || $action == 'addsentcategory') {
-    if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+if ('addreceivedcategory' == $action || 'addsentcategory' == $action) {
+    if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
         api_not_allowed();
     }
     $categoryName = isset($_POST['category_name']) ? $_POST['category_name'] : '';
@@ -86,12 +86,12 @@ if ($action == 'addreceivedcategory' || $action == 'addsentcategory') {
 }
 
 // Editing a category: displaying the form
-if ($action == 'editcategory' && isset($_GET['id'])) {
-    if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+if ('editcategory' == $action && isset($_GET['id'])) {
+    if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
         api_not_allowed();
     }
     if (!$_POST) {
-        if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+        if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
             api_not_allowed();
         }
         display_addcategory_form('', $_GET['id'], 'editcategory');
@@ -100,16 +100,16 @@ if ($action == 'editcategory' && isset($_GET['id'])) {
 
 // Storing a new or edited category
 if (isset($_POST['StoreCategory'])) {
-    if (api_get_session_id() != 0 &&
+    if (0 != api_get_session_id() &&
         !api_is_allowed_to_session_edit(false, true)
     ) {
         api_not_allowed();
     }
     $return_information = store_addcategory();
-    if ($return_information['type'] == 'confirmation') {
+    if ('confirmation' == $return_information['type']) {
         echo Display::return_message($return_information['message'], 'confirmation');
     }
-    if ($return_information['type'] == 'error') {
+    if ('error' == $return_information['type']) {
         echo Display::return_message(
             get_lang('The form contains incorrect or incomplete data. Please check your input.').'<br />'.$return_information['message'],
             'error'
@@ -119,8 +119,8 @@ if (isset($_POST['StoreCategory'])) {
 }
 
 // Move a File
-if (($action == 'movesent' || $action == 'movereceived') && isset($_GET['move_id'])) {
-    if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+if (('movesent' == $action || 'movereceived' == $action) && isset($_GET['move_id'])) {
+    if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
         api_not_allowed();
     }
     display_move_form(
@@ -146,8 +146,8 @@ if (isset($_POST['do_move'])) {
 }
 
 // Delete a file
-if (($action == 'deletereceivedfile' || $action == 'deletesentfile') && isset($_GET['id']) && is_numeric($_GET['id'])) {
-    if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+if (('deletereceivedfile' == $action || 'deletesentfile' == $action) && isset($_GET['id']) && is_numeric($_GET['id'])) {
+    if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
         api_not_allowed();
     }
     $dropboxfile = new Dropbox_Person(
@@ -155,11 +155,11 @@ if (($action == 'deletereceivedfile' || $action == 'deletesentfile') && isset($_
         $is_courseAdmin,
         $is_courseTutor
     );
-    if ($action == 'deletereceivedfile') {
+    if ('deletereceivedfile' == $action) {
         $dropboxfile->deleteReceivedWork($_GET['id']);
         $message = get_lang('The received file has been deleted.');
     }
-    if ($action == 'deletesentfile') {
+    if ('deletesentfile' == $action) {
         $dropboxfile->deleteSentWork($_GET['id']);
         $message = get_lang('The sent file has been deleted.');
     }
@@ -167,10 +167,10 @@ if (($action == 'deletereceivedfile' || $action == 'deletesentfile') && isset($_
 }
 
 // Delete a category
-if (($action == 'deletereceivedcategory' || $action == 'deletesentcategory') &&
+if (('deletereceivedcategory' == $action || 'deletesentcategory' == $action) &&
     isset($_GET['id']) && is_numeric($_GET['id'])
 ) {
-    if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+    if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
         api_not_allowed();
     }
     $message = delete_category($action, $_GET['id']);
@@ -184,10 +184,10 @@ if (($action == 'deletereceivedcategory' || $action == 'deletesentcategory') &&
 if (!isset($_POST['feedback']) && (
     strstr($postAction, 'move_received') ||
     strstr($postAction, 'move_sent') ||
-    $postAction == 'delete_received' ||
-    $postAction == 'download_received' ||
-    $postAction == 'delete_sent' ||
-    $postAction == 'download_sent'
+    'delete_received' == $postAction ||
+    'download_received' == $postAction ||
+    'delete_sent' == $postAction ||
+    'download_sent' == $postAction
 )
 ) {
     $display_message = handle_multiple_actions();
@@ -196,7 +196,7 @@ if (!isset($_POST['feedback']) && (
 
 // Store Feedback
 if (isset($_POST['feedback'])) {
-    if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+    if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
         api_not_allowed();
     }
     $check = Security::check_token();
@@ -216,32 +216,32 @@ $dropbox_data_sent = [];
 $movelist = [];
 $dropbox_data_recieved = [];
 
-if ($action != 'add') {
+if ('add' != $action) {
     // Getting all the categories in the dropbox for the given user
     $dropbox_categories = get_dropbox_categories();
     // Greating the arrays with the categories for the received files and for the sent files
     foreach ($dropbox_categories as $category) {
-        if ($category['received'] == '1') {
+        if ('1' == $category['received']) {
             $dropbox_received_category[] = $category;
         }
-        if ($category['sent'] == '1') {
+        if ('1' == $category['sent']) {
             $dropbox_sent_category[] = $category;
         }
     }
 
     // ACTIONS
-    if ($view == 'received' || !$showSentReceivedTabs) {
+    if ('received' == $view || !$showSentReceivedTabs) {
         // This is for the categories
-        if (isset($viewReceivedCategory) && $viewReceivedCategory != '') {
+        if (isset($viewReceivedCategory) && '' != $viewReceivedCategory) {
             $view_dropbox_category_received = $viewReceivedCategory;
         } else {
             $view_dropbox_category_received = 0;
         }
         /* Menu Received */
 
-        if (api_get_session_id() == 0) {
+        if (0 == api_get_session_id()) {
             echo '<div class="actions">';
-            if ($view_dropbox_category_received != 0 && api_is_allowed_to_session_edit(false, true)) {
+            if (0 != $view_dropbox_category_received && api_is_allowed_to_session_edit(false, true)) {
                 echo '<a href="'.api_get_self().'?'.api_get_cidreq().'&view_received_category=0&view_sent_category='.$viewSentCategory.'&view='.$view.'">'.
                     Display::return_icon('folder_up.png', get_lang('Up').' '.get_lang('root'), '', ICON_SIZE_MEDIUM).
                     "</a>";
@@ -255,7 +255,7 @@ if ($action != 'add') {
         } else {
             if (api_is_allowed_to_session_edit(false, true)) {
                 echo '<div class="actions">';
-                if ($view_dropbox_category_received != 0 && api_is_allowed_to_session_edit(false, true)) {
+                if (0 != $view_dropbox_category_received && api_is_allowed_to_session_edit(false, true)) {
                     echo '<a href="'.api_get_self().'?'.api_get_cidreq().'&view_received_category=0&view_sent_category='.$viewSentCategory.'&view='.$view.'">'.
                         Display::return_icon('folder_up.png', get_lang('Up').' '.get_lang('root'), '', ICON_SIZE_MEDIUM)."</a>";
                     echo get_lang('Category').': <strong>'.Security::remove_XSS($dropbox_categories[$view_dropbox_category_received]['cat_name']).'</strong> ';
@@ -270,23 +270,23 @@ if ($action != 'add') {
         }
     }
 
-    if (!$view || $view == 'sent' || !$showSentReceivedTabs) {
+    if (!$view || 'sent' == $view || !$showSentReceivedTabs) {
         // This is for the categories
-        if (isset($viewSentCategory) && $viewSentCategory != '') {
+        if (isset($viewSentCategory) && '' != $viewSentCategory) {
             $view_dropbox_category_sent = $viewSentCategory;
         } else {
             $view_dropbox_category_sent = 0;
         }
 
         /* Menu Sent */
-        if (api_get_session_id() == 0) {
+        if (0 == api_get_session_id()) {
             echo '<div class="actions">';
             if (empty($viewSentCategory)) {
                 echo "<a href=\"".api_get_self()."?".api_get_cidreq()."&view=".$view."&action=add\">".
                     Display::return_icon('upload_file.png', get_lang('Share a new file'), '', ICON_SIZE_MEDIUM).
                     "</a>";
             }
-            if ($view_dropbox_category_sent != 0) {
+            if (0 != $view_dropbox_category_sent) {
                 echo '<a href="'.api_get_self().'?'.api_get_cidreq().'&view_received_category='.$viewReceivedCategory.'&view_sent_category=0&view='.$view.'">'.
                     Display::return_icon('folder_up.png', get_lang('Up').' '.get_lang('root'), '', ICON_SIZE_MEDIUM).
                     "</a>";
@@ -304,7 +304,7 @@ if ($action != 'add') {
                         Display::return_icon('upload_file.png', get_lang('Share a new file'), '', ICON_SIZE_MEDIUM).
                     "</a>";
                 }
-                if ($view_dropbox_category_sent != 0) {
+                if (0 != $view_dropbox_category_sent) {
                     echo get_lang('You are in folder').': <strong>'.Security::remove_XSS($dropbox_categories[$view_dropbox_category_sent]['cat_name']).'</strong> ';
                     echo '<a href="'.api_get_self().'?'.api_get_cidreq().'&view_received_category='.$viewReceivedCategory.'&view_sent_category=0&view='.$view.'">'.
                         Display::return_icon('folder_up.png', get_lang('Up').' '.get_lang('root'), '', ICON_SIZE_MEDIUM).
@@ -321,14 +321,14 @@ if ($action != 'add') {
     if ($showSentReceivedTabs) {
         ?>
 <ul class="nav nav-tabs">
-    <li <?php if (!$view || $view == 'sent') {
+    <li <?php if (!$view || 'sent' == $view) {
             echo 'class="active"';
         } ?> >
         <a href="<?php echo api_get_path(WEB_CODE_PATH).'dropbox/'; ?>index.php?<?php echo api_get_cidreq(); ?>&view=sent" >
             <?php echo get_lang('Sent Files'); ?>
         </a>
     </li>
-    <li <?php if ($view == 'received') {
+    <li <?php if ('received' == $view) {
             echo 'class="active"';
         } ?> >
         <a href="<?php echo api_get_path(WEB_CODE_PATH).'dropbox/'; ?>index.php?<?php echo api_get_cidreq(); ?>&view=received"  >
@@ -338,9 +338,9 @@ if ($action != 'add') {
 <?php
     }
     /*	RECEIVED FILES */
-    if ($view == 'received' || !$showSentReceivedTabs) {
+    if ('received' == $view || !$showSentReceivedTabs) {
         // This is for the categories
-        if (isset($viewReceivedCategory) && $viewReceivedCategory != '') {
+        if (isset($viewReceivedCategory) && '' != $viewReceivedCategory) {
             $view_dropbox_category_received = $viewReceivedCategory;
         } else {
             $view_dropbox_category_received = 0;
@@ -366,7 +366,7 @@ if ($action != 'add') {
         $column_header[] = [get_lang('Authors'), true, ''];
         $column_header[] = [get_lang('Latest sent on'), true];
 
-        if (api_get_session_id() == 0) {
+        if (0 == api_get_session_id()) {
             $column_header[] = [get_lang('Edit'), false, '', 'nowrap style="text-align: right"'];
         } elseif (api_is_allowed_to_session_edit(false, true)) {
             $column_header[] = [get_lang('Edit'), false, '', 'nowrap style="text-align: right"'];
@@ -383,7 +383,7 @@ if ($action != 'add') {
         $column_show[] = 1;
         $column_show[] = 1;
 
-        if (api_get_session_id() == 0) {
+        if (0 == api_get_session_id()) {
             $column_show[] = 1;
         } elseif (api_is_allowed_to_session_edit(false, true)) {
             $column_show[] = 1;
@@ -451,7 +451,7 @@ if ($action != 'add') {
                 '</a>';
 
                 // This is a hack to have an additional row in a sortable table
-                if ($action == 'viewfeedback' && isset($_GET['id']) && is_numeric($_GET['id']) && $dropbox_file->id == $_GET['id']) {
+                if ('viewfeedback' == $action && isset($_GET['id']) && is_numeric($_GET['id']) && $dropbox_file->id == $_GET['id']) {
                     $action_icons .= "</td></tr>"; // Ending the normal row of the sortable table
                     $url = api_get_path(WEB_CODE_PATH).'dropbox/index.php?"'.api_get_cidreq().'&view_received_category='.$viewReceivedCategory."&view_sent_category=".$viewSentCategory."&view=".$view.'&'.$sort_params;
                     $action_icons .= "        
@@ -460,7 +460,7 @@ if ($action != 'add') {
                         feedback($dropbox_file->feedback2, $url).
                         "</td></tr>";
                 }
-                if (api_get_session_id() == 0) {
+                if (0 == api_get_session_id()) {
                     $dropbox_file_data[] = $action_icons;
                 } elseif (api_is_allowed_to_session_edit(false, true)) {
                     $dropbox_file_data[] = $action_icons;
@@ -473,13 +473,13 @@ if ($action != 'add') {
         }
 
         // The content of the sortable table = the categories (if we are not in the root)
-        if ($view_dropbox_category_received == 0) {
+        if (0 == $view_dropbox_category_received) {
             foreach ($dropbox_categories as $category) {
                 /*  Note: This can probably be shortened since the categories
                 for the received files are already in the
                 $dropbox_received_category array;*/
                 $dropbox_category_data = [];
-                if ($category['received'] == '1') {
+                if ('1' == $category['received']) {
                     $movelist[$category['cat_id']] = $category['cat_name'];
                     // This is where the checkbox icon for the files appear
                     $dropbox_category_data[] = $category['cat_id'];
@@ -521,7 +521,7 @@ if ($action != 'add') {
             }
         }
 
-        if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+        if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
             $selectlist = [];
         }
         echo '<div class="files-table">';
@@ -540,9 +540,9 @@ if ($action != 'add') {
     }
 
     /*	SENT FILES */
-    if (!$view || $view == 'sent' || !$showSentReceivedTabs) {
+    if (!$view || 'sent' == $view || !$showSentReceivedTabs) {
         // This is for the categories
-        if (isset($viewSentCategory) && $viewSentCategory != '') {
+        if (isset($viewSentCategory) && '' != $viewSentCategory) {
             $view_dropbox_category_sent = $viewSentCategory;
         } else {
             $view_dropbox_category_sent = 0;
@@ -564,7 +564,7 @@ if ($action != 'add') {
         $column_header[] = [get_lang('Visible to'), true, ''];
         $column_header[] = [get_lang('Latest sent on'), true, ''];
 
-        if (api_get_session_id() == 0) {
+        if (0 == api_get_session_id()) {
             $column_header[] = [get_lang('Edit'), false, '', 'nowrap style="text-align: right"'];
         } elseif (api_is_allowed_to_session_edit(false, true)) {
             $column_header[] = [get_lang('Edit'), false, '', 'nowrap style="text-align: right"'];
@@ -583,7 +583,7 @@ if ($action != 'add') {
         $column_show[] = 1;
         $column_show[] = 1;
         $column_show[] = 1;
-        if (api_get_session_id() == 0) {
+        if (0 == api_get_session_id()) {
             $column_show[] = 1;
         } elseif (api_is_allowed_to_session_edit(false, true)) {
             $column_show[] = 1;
@@ -638,7 +638,7 @@ if ($action != 'add') {
                         Display::return_icon('delete.png', get_lang('Delete'), '', ICON_SIZE_SMALL).
                     '</a>';
                 // This is a hack to have an additional row in a sortable table
-                if ($action == 'viewfeedback' && isset($_GET['id']) && is_numeric($_GET['id']) && $dropbox_file->id == $_GET['id']) {
+                if ('viewfeedback' == $action && isset($_GET['id']) && is_numeric($_GET['id']) && $dropbox_file->id == $_GET['id']) {
                     $action_icons .= "</td></tr>\n"; // ending the normal row of the sortable table
                     $action_icons .= "<tr><td colspan=\"9\">";
                     $url = api_get_path(WEB_CODE_PATH)."dropbox/index.php?".api_get_cidreq()."&view_received_category=".$viewReceivedCategory."&view_sent_category=".$viewSentCategory."&view=".$view.'&'.$sort_params;
@@ -656,10 +656,10 @@ if ($action != 'add') {
 
         $moveList = [];
         // The content of the sortable table = the categories (if we are not in the root)
-        if ($view_dropbox_category_sent == 0) {
+        if (0 == $view_dropbox_category_sent) {
             foreach ($dropbox_categories as $category) {
                 $dropbox_category_data = [];
-                if ($category['sent'] == '1') {
+                if ('1' == $category['sent']) {
                     $moveList[$category['cat_id']] = $category['cat_name'];
                     $dropbox_category_data[] = $category['cat_id'];
                     // This is where the checkbox icon for the files appear.
@@ -699,7 +699,7 @@ if ($action != 'add') {
             }
         }
 
-        if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+        if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
             $selectlist = ['download_received' => get_lang('Download')];
         }
 
diff --git a/public/main/dropbox/recover_dropbox_files.php b/public/main/dropbox/recover_dropbox_files.php
index 244ffe1b6b..abe0935bd8 100644
--- a/public/main/dropbox/recover_dropbox_files.php
+++ b/public/main/dropbox/recover_dropbox_files.php
@@ -40,7 +40,7 @@ if (Database::num_rows($result)) {
         $sql = "SELECT * FROM $person_tbl
                 WHERE c_id = $course_id AND user_id = $user_id AND file_id = {$file['id']}";
         $result_person = Database::query($sql);
-        if (Database::num_rows($result_person) == 0) {
+        if (0 == Database::num_rows($result_person)) {
             $rows[] = [
                 $file['filename'],
                 api_convert_and_format_date($file['upload_date']),
diff --git a/public/main/dropbox/update.php b/public/main/dropbox/update.php
index b77f5f1e8c..3704061306 100644
--- a/public/main/dropbox/update.php
+++ b/public/main/dropbox/update.php
@@ -5,7 +5,7 @@ require_once 'dropbox_init.inc.php';
 
 api_protect_course_script();
 
-if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/exercise/Draggable.php b/public/main/exercise/Draggable.php
index f6abf56231..3cfe6f2b09 100644
--- a/public/main/exercise/Draggable.php
+++ b/public/main/exercise/Draggable.php
@@ -33,19 +33,19 @@ class Draggable extends Question
             $nb_options = $form->getSubmitValue('nb_options');
 
             if (isset($_POST['lessMatches'])) {
-                --$nb_matches;
+                $nb_matches--;
             }
 
             if (isset($_POST['moreMatches'])) {
-                ++$nb_matches;
+                $nb_matches++;
             }
 
             if (isset($_POST['lessOptions'])) {
-                --$nb_options;
+                $nb_options--;
             }
 
             if (isset($_POST['moreOptions'])) {
-                ++$nb_options;
+                $nb_options++;
             }
         } elseif (!empty($this->id)) {
             $defaults['orientation'] = in_array($this->extra, ['h', 'v']) ? $this->extra : 'h';
@@ -55,15 +55,15 @@ class Draggable extends Question
 
             if ($answer->nbrAnswers > 0) {
                 $nb_matches = $nb_options = 0;
-                for ($i = 1; $i <= $answer->nbrAnswers; ++$i) {
+                for ($i = 1; $i <= $answer->nbrAnswers; $i++) {
                     if ($answer->isCorrect($i)) {
-                        ++$nb_matches;
+                        $nb_matches++;
                         $defaults['answer['.$nb_matches.']'] = $answer->selectAnswer($i);
                         $defaults['weighting['.$nb_matches.']'] = float_format($answer->selectWeighting($i), 1);
                         $answerInfo = $answer->getAnswerByAutoId($answer->correct[$i]);
                         $defaults['matches['.$nb_matches.']'] = isset($answerInfo['answer']) ? $answerInfo['answer'] : '';
                     } else {
-                        ++$nb_options;
+                        $nb_options++;
                         $defaults['option['.$nb_options.']'] = $answer->selectAnswer($i);
                     }
                 }
@@ -77,7 +77,7 @@ class Draggable extends Question
             $defaults['orientation'] = 'h';
         }
 
-        for ($i = 1; $i <= $nb_matches; ++$i) {
+        for ($i = 1; $i <= $nb_matches; $i++) {
             $matches[$i] = $i;
         }
 
@@ -109,7 +109,7 @@ class Draggable extends Question
             echo Display::return_message(get_lang('You have to create at least one answer'), 'normal');
         }
 
-        for ($i = 1; $i <= $nb_matches; ++$i) {
+        for ($i = 1; $i <= $nb_matches; $i++) {
             $renderer = &$form->defaultRenderer();
             $renderer->setElementTemplate(
                 '<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error -->{element}</td>',
@@ -177,14 +177,14 @@ class Draggable extends Question
         $position = 0;
         $objAnswer = new Answer($this->id);
         // Insert the options
-        for ($i = 1; $i <= $nb_matches; ++$i) {
-            ++$position;
+        for ($i = 1; $i <= $nb_matches; $i++) {
+            $position++;
             $objAnswer->createAnswer($position, 0, '', 0, $position);
         }
 
         // Insert the answers
-        for ($i = 1; $i <= $nb_matches; ++$i) {
-            ++$position;
+        for ($i = 1; $i <= $nb_matches; $i++) {
+            $position++;
             $answer = $form->getSubmitValue('answer['.$i.']');
             $matches = $form->getSubmitValue('matches['.$i.']');
             $weighting = $form->getSubmitValue('weighting['.$i.']');
diff --git a/public/main/exercise/Hpdownload.php b/public/main/exercise/Hpdownload.php
index 3ed7de3d2a..d96c59f38f 100644
--- a/public/main/exercise/Hpdownload.php
+++ b/public/main/exercise/Hpdownload.php
@@ -4,7 +4,6 @@
 /**
  * This script shows the list of exercises for administrators and students.
  *
- *
  * @author Istvan Mandak
  *
  * @version $Id: Hpdownload.php 22201 2009-07-17 19:57:03Z cfasanando $
diff --git a/public/main/exercise/MatchingDraggable.php b/public/main/exercise/MatchingDraggable.php
index 1c87c3fcd5..cca082c874 100644
--- a/public/main/exercise/MatchingDraggable.php
+++ b/public/main/exercise/MatchingDraggable.php
@@ -34,11 +34,11 @@ class MatchingDraggable extends Question
             $answer->read();
 
             if ($answer->nbrAnswers > 0) {
-                for ($i = 1; $i <= $answer->nbrAnswers; ++$i) {
+                for ($i = 1; $i <= $answer->nbrAnswers; $i++) {
                     $correct = $answer->isCorrect($i);
                     if (empty($correct)) {
                         $matches[$answer->selectAutoId($i)] = chr(64 + $counter);
-                        ++$counter;
+                        $counter++;
                     }
                 }
             }
@@ -48,24 +48,24 @@ class MatchingDraggable extends Question
             $nb_matches = $form->getSubmitValue('nb_matches');
             $nb_options = $form->getSubmitValue('nb_options');
             if (isset($_POST['lessOptions'])) {
-                --$nb_matches;
-                --$nb_options;
+                $nb_matches--;
+                $nb_options--;
             }
             if (isset($_POST['moreOptions'])) {
-                ++$nb_matches;
-                ++$nb_options;
+                $nb_matches++;
+                $nb_options++;
             }
         } elseif (!empty($this->id)) {
             if ($answer->nbrAnswers > 0) {
                 $nb_matches = $nb_options = 0;
-                for ($i = 1; $i <= $answer->nbrAnswers; ++$i) {
+                for ($i = 1; $i <= $answer->nbrAnswers; $i++) {
                     if ($answer->isCorrect($i)) {
-                        ++$nb_matches;
+                        $nb_matches++;
                         $defaults['answer['.$nb_matches.']'] = $answer->selectAnswer($i);
                         $defaults['weighting['.$nb_matches.']'] = float_format($answer->selectWeighting($i), 1);
                         $defaults['matches['.$nb_matches.']'] = $answer->correct[$i];
                     } else {
-                        ++$nb_options;
+                        $nb_options++;
                         $defaults['option['.$nb_options.']'] = $answer->selectAnswer($i);
                     }
                 }
@@ -79,12 +79,12 @@ class MatchingDraggable extends Question
         }
 
         if (empty($matches)) {
-            for ($i = 1; $i <= $nb_options; ++$i) {
+            for ($i = 1; $i <= $nb_options; $i++) {
                 // fill the array with A, B, C.....
                 $matches[$i] = chr(64 + $i);
             }
         } else {
-            for ($i = $counter; $i <= $nb_options; ++$i) {
+            for ($i = $counter; $i <= $nb_options; $i++) {
                 // fill the array with A, B, C.....
                 $matches[$i] = chr(64 + $i);
             }
@@ -119,7 +119,7 @@ class MatchingDraggable extends Question
             'Height' => '125',
         ];
 
-        for ($i = 1; $i <= $nb_matches; ++$i) {
+        for ($i = 1; $i <= $nb_matches; $i++) {
             $renderer = &$form->defaultRenderer();
             $renderer->setElementTemplate(
                 '<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error -->{element}</td>',
@@ -172,7 +172,7 @@ class MatchingDraggable extends Question
             echo Display::return_message(get_lang('You have to create at least one answer'), 'normal');
         }
 
-        for ($i = 1; $i <= $nb_options; ++$i) {
+        for ($i = 1; $i <= $nb_options; $i++) {
             $renderer = &$form->defaultRenderer();
 
             $renderer->setElementTemplate(
@@ -226,15 +226,15 @@ class MatchingDraggable extends Question
         $objAnswer = new Answer($this->id);
 
         // Insert the options
-        for ($i = 1; $i <= $nb_options; ++$i) {
-            ++$position;
+        for ($i = 1; $i <= $nb_options; $i++) {
+            $position++;
             $option = $form->getSubmitValue("option[$i]");
             $objAnswer->createAnswer($option, 0, '', 0, $position);
         }
 
         // Insert the answers
-        for ($i = 1; $i <= $nb_matches; ++$i) {
-            ++$position;
+        for ($i = 1; $i <= $nb_matches; $i++) {
+            $position++;
             $answer = $form->getSubmitValue("answer[$i]");
             $matches = $form->getSubmitValue("matches[$i]");
             $weighting = $form->getSubmitValue("weighting[$i]");
diff --git a/public/main/exercise/MultipleAnswerTrueFalseDegreeCertainty.php b/public/main/exercise/MultipleAnswerTrueFalseDegreeCertainty.php
index f115862477..a90b0adef9 100644
--- a/public/main/exercise/MultipleAnswerTrueFalseDegreeCertainty.php
+++ b/public/main/exercise/MultipleAnswerTrueFalseDegreeCertainty.php
@@ -102,7 +102,7 @@ class MultipleAnswerTrueFalseDegreeCertainty extends Question
         // Can be more options
         $optionData = Question::readQuestionOption($this->id, $courseId);
 
-        for ($i = 1; $i <= $nbAnswers; ++$i) {
+        for ($i = 1; $i <= $nbAnswers; $i++) {
             $renderer->setElementTemplate(
                 '<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error --><br/>{element}</td>',
                 'correct['.$i.']'
@@ -149,7 +149,7 @@ class MultipleAnswerTrueFalseDegreeCertainty extends Question
                 if (!empty($optionData)) {
                     foreach ($optionData as $id => $data) {
                         $form->addElement('radio', 'correct['.$i.']', null, null, $id);
-                        ++$j;
+                        $j++;
                         if (3 == $j) {
                             break;
                         }
@@ -203,7 +203,7 @@ class MultipleAnswerTrueFalseDegreeCertainty extends Question
         if (!empty($this->extra)) {
             $scores = explode(':', $this->extra);
             if (!empty($scores)) {
-                for ($i = 1; $i <= 3; ++$i) {
+                for ($i = 1; $i <= 3; $i++) {
                     $defaults['option['.$i.']'] = $scores[$i - 1];
                 }
             }
@@ -253,7 +253,7 @@ class MultipleAnswerTrueFalseDegreeCertainty extends Question
                 Question::updateQuestionOption($id, $optionData, $courseId);
             }
         } else {
-            for ($i = 1; $i <= 8; ++$i) {
+            for ($i = 1; $i <= 8; $i++) {
                 $lastId = Question::saveQuestionOption($this->id, $this->options[$i], $courseId, $i);
                 $correct[$i] = $lastId;
             }
@@ -271,13 +271,13 @@ class MultipleAnswerTrueFalseDegreeCertainty extends Question
           the true, false, doubt options registered in this format
           XX:YY:ZZZ where XX is a float score value. */
         $extraValues = [];
-        for ($i = 1; $i <= 3; ++$i) {
+        for ($i = 1; $i <= 3; $i++) {
             $score = trim($form->getSubmitValue('option['.$i.']'));
             $extraValues[] = $score;
         }
         $this->setExtra(implode(':', $extraValues));
 
-        for ($i = 1; $i <= $nbAnswers; ++$i) {
+        for ($i = 1; $i <= $nbAnswers; $i++) {
             $answer = trim($form->getSubmitValue('answer['.$i.']'));
             $comment = trim($form->getSubmitValue('comment['.$i.']'));
             $goodAnswer = trim($form->getSubmitValue('correct['.$i.']'));
@@ -572,7 +572,7 @@ class MultipleAnswerTrueFalseDegreeCertainty extends Question
                 $html .= '<div style="clear:both; height: 10px;">&nbsp;</div>';
                 $i = 0;
             } else {
-                ++$i;
+                $i++;
             }
         }
         $html .= '</div>';
@@ -906,7 +906,7 @@ class MultipleAnswerTrueFalseDegreeCertainty extends Question
                 ;
                 $html .= get_lang($explain);
                 $html .= '</td>';
-                ++$i;
+                $i++;
             }
             $html .= '</tr>';
         }
@@ -1003,7 +1003,7 @@ class MultipleAnswerTrueFalseDegreeCertainty extends Question
             if (MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY == $oQuestion->type) {
                 $answerColor = self::getAnswerColor($exeId, $attemptInfo['question_id'], $attemptInfo['position']);
                 if ($answerColor) {
-                    ++$result[$answerColor];
+                    $result[$answerColor]++;
                 }
             }
         }
@@ -1050,7 +1050,7 @@ class MultipleAnswerTrueFalseDegreeCertainty extends Question
                     if (!isset($result[$questionCategory][$answerColor])) {
                         $result[$questionCategory][$answerColor] = 0;
                     }
-                    ++$result[$questionCategory][$answerColor];
+                    $result[$questionCategory][$answerColor]++;
                 }
             }
         }
diff --git a/public/main/exercise/ReadingComprehension.php b/public/main/exercise/ReadingComprehension.php
index 87b40444a2..0c33588750 100644
--- a/public/main/exercise/ReadingComprehension.php
+++ b/public/main/exercise/ReadingComprehension.php
@@ -92,7 +92,7 @@ class ReadingComprehension extends UniqueAnswer
 
         $firstIndex = $indexes[0];
 
-        for ($i = 1; $i <= $turns; ++$i) {
+        for ($i = 1; $i <= $turns; $i++) {
             $text = substr_replace($text, $tagStart, $firstIndex, 0);
 
             if ($i * $this->expectedWordsPerRefresh <= count($words)) {
diff --git a/public/main/exercise/TestCategory.php b/public/main/exercise/TestCategory.php
index 7e223ef4bc..73f05c464c 100644
--- a/public/main/exercise/TestCategory.php
+++ b/public/main/exercise/TestCategory.php
@@ -398,9 +398,9 @@ class TestCategory
         $quiz->read($exerciseId);
         $questionList = $quiz->selectQuestionList();
         // the array given by selectQuestionList start at indice 1 and not at indice 0 !!! ? ? ?
-        for ($i = 1; $i <= count($questionList); ++$i) {
+        for ($i = 1; $i <= count($questionList); $i++) {
             if (self::getCategoryForQuestion($questionList[$i]) == $categoryId) {
-                ++$nbCatResult;
+                $nbCatResult++;
             }
         }
 
@@ -719,7 +719,7 @@ class TestCategory
                         true
                     )
                 );
-                ++$row;
+                $row++;
             }
 
             if (!empty($none_category)) {
@@ -744,7 +744,7 @@ class TestCategory
                         true
                     )
                 );
-                ++$row;
+                $row++;
             }
             if (!empty($total)) {
                 $table->setCellContents($row, 0, get_lang('Total'));
diff --git a/public/main/exercise/UniqueAnswerImage.php b/public/main/exercise/UniqueAnswerImage.php
index 5a3e9354ff..67a5555e37 100644
--- a/public/main/exercise/UniqueAnswerImage.php
+++ b/public/main/exercise/UniqueAnswerImage.php
@@ -126,7 +126,7 @@ class UniqueAnswerImage extends UniqueAnswer
             echo Display::return_message(get_lang('You have to create at least one answer'));
         }
 
-        for ($i = 1; $i <= $numberAnswers; ++$i) {
+        for ($i = 1; $i <= $numberAnswers; $i++) {
             $form->addHtml('<tr>');
             if (isset($answer) && is_object($answer)) {
                 if ($answer->correct[$i]) {
@@ -261,7 +261,7 @@ class UniqueAnswerImage extends UniqueAnswer
         $objAnswer = new Answer($this->id);
         $numberAnswers = $form->getSubmitValue('nb_answers');
 
-        for ($i = 1; $i <= $numberAnswers; ++$i) {
+        for ($i = 1; $i <= $numberAnswers; $i++) {
             $answer = trim(str_replace(['<p>', '</p>'], '', $form->getSubmitValue('answer['.$i.']')));
             $comment = trim(str_replace(['<p>', '</p>'], '', $form->getSubmitValue('comment['.$i.']')));
             $weighting = trim($form->getSubmitValue('weighting['.$i.']'));
@@ -296,7 +296,7 @@ class UniqueAnswerImage extends UniqueAnswer
               } */
             $goodAnswer = $correct == $i ? true : false;
             if ($goodAnswer) {
-                ++$nbrGoodAnswers;
+                $nbrGoodAnswers++;
                 $weighting = abs($weighting);
 
                 if ($weighting > 0) {
diff --git a/public/main/exercise/aiken.php b/public/main/exercise/aiken.php
index e3f7330890..a63b2347c0 100644
--- a/public/main/exercise/aiken.php
+++ b/public/main/exercise/aiken.php
@@ -5,7 +5,6 @@
 /**
  * Code for Aiken import integration.
  *
- *
  * @author Ronny Velasquez <ronny.velasquez@beeznest.com>
  * @author César Perales <cesar.perales@gmail.com> Updated function names and import files for Aiken format support
  */
diff --git a/public/main/exercise/answer.class.php b/public/main/exercise/answer.class.php
index 01bccc35ea..bbc26bd684 100644
--- a/public/main/exercise/answer.class.php
+++ b/public/main/exercise/answer.class.php
@@ -9,7 +9,6 @@ use Chamilo\CourseBundle\Entity\CQuizAnswer;
  * Allows to instantiate an object of type Answer
  * 5 arrays are created to receive the attributes of each answer belonging to a specified question.
  *
- *
  * @author Olivier Brouckaert
  */
 class Answer
@@ -148,7 +147,7 @@ class Answer
             $this->destination[$i] = $object->destination;
             $this->autoId[$i] = $object->id_auto;
             $this->iid[$i] = $object->iid;
-            ++$i;
+            $i++;
         }
         $this->nbrAnswers = $i - 1;
     }
@@ -275,7 +274,7 @@ class Answer
             $this->destination[$i] = $object->destination;
             $this->autoId[$i] = $object->id_auto;
             $this->iid[$i] = $object->iid;
-            ++$i;
+            $i++;
         }
 
         if (UNIQUE_ANSWER_NO_OPTION == $questionType['type'] && !empty($doubt_data)) {
@@ -289,7 +288,7 @@ class Answer
             $this->destination[$i] = $doubt_data->destination;
             $this->autoId[$i] = $doubt_data->id_auto;
             $this->iid[$i] = $doubt_data->iid;
-            ++$i;
+            $i++;
         }
         $this->nbrAnswers = $i - 1;
 
@@ -417,7 +416,7 @@ class Answer
     public function getAnswersList($decode = false)
     {
         $list = [];
-        for ($i = 1; $i <= $this->nbrAnswers; ++$i) {
+        for ($i = 1; $i <= $this->nbrAnswers; $i++) {
             if (!empty($this->answer[$i])) {
                 //Avoid problems when parsing elements with accents
                 if ($decode) {
@@ -459,7 +458,7 @@ class Answer
     public function getGradesList()
     {
         $list = [];
-        for ($i = 0; $i < $this->nbrAnswers; ++$i) {
+        for ($i = 0; $i < $this->nbrAnswers; $i++) {
             if (!empty($this->answer[$i])) {
                 $list[$i] = $this->weighting[$i];
             }
@@ -597,7 +596,7 @@ class Answer
         $new_hotspot_type = null,
         $destination = ''
     ) {
-        ++$this->new_nbrAnswers;
+        $this->new_nbrAnswers++;
         $id = $this->new_nbrAnswers;
         $this->new_answer[$id] = $answer;
         $this->new_correct[$id] = $correct;
@@ -675,7 +674,7 @@ class Answer
         $courseId = $this->course['real_id'];
         $answerList = [];
 
-        for ($i = 1; $i <= $this->new_nbrAnswers; ++$i) {
+        for ($i = 1; $i <= $this->new_nbrAnswers; $i++) {
             $answer = $this->new_answer[$i];
             $correct = isset($this->new_correct[$i]) ? $this->new_correct[$i] : '';
             $comment = isset($this->new_comment[$i]) ? $this->new_comment[$i] : '';
@@ -803,7 +802,7 @@ class Answer
                             question_id = '".$questionId."' AND
                             position ='$position'";
                 Database::query($sql);
-                ++$i;
+                $i++;
             }
         }
 
@@ -863,7 +862,7 @@ class Answer
             if (!empty($destination_options)) {
                 foreach ($destination_options as $item) {
                     $fixed_list[$new_option_list[$i]] = $item['id'];
-                    ++$i;
+                    $i++;
                 }
             }
         }
@@ -880,7 +879,7 @@ class Answer
 
             if (in_array($newQuestion->type, [MATCHING, MATCHING_DRAGGABLE])) {
                 $temp = [];
-                for ($i = 1; $i <= $this->nbrAnswers; ++$i) {
+                for ($i = 1; $i <= $this->nbrAnswers; $i++) {
                     $answer = [
                         'id' => $this->id[$i],
                         'answer' => $this->answer[$i],
@@ -944,7 +943,7 @@ class Answer
                     }
                 }
             } else {
-                for ($i = 1; $i <= $this->nbrAnswers; ++$i) {
+                for ($i = 1; $i <= $this->nbrAnswers; $i++) {
                     if ($this->course['id'] != $course_info['id']) {
                         $this->answer[$i] = DocumentManager::replaceUrlWithNewCourseCode(
                             $this->answer[$i],
diff --git a/public/main/exercise/calculated_answer.class.php b/public/main/exercise/calculated_answer.class.php
index b45e61ed92..5119841672 100644
--- a/public/main/exercise/calculated_answer.class.php
+++ b/public/main/exercise/calculated_answer.class.php
@@ -198,12 +198,12 @@ class CalculatedAnswer extends Question
             $this->weighting = $form->getSubmitValue('weighting');
 
             // Create as many answers as $answerVariations
-            for ($j = 0; $j < $answerVariations; ++$j) {
+            for ($j = 0; $j < $answerVariations; $j++) {
                 $auxAnswer = $answer;
                 $auxFormula = $formula;
                 $nb = preg_match_all('/\[[^\]]*\]/', $auxAnswer, $blanks);
                 if ($nb > 0) {
-                    for ($i = 0; $i < $nb; ++$i) {
+                    for ($i = 0; $i < $nb; $i++) {
                         $blankItem = $blanks[0][$i];
 
                         // take random float values when one or both edge values have a decimal point
diff --git a/public/main/exercise/exercise.class.php b/public/main/exercise/exercise.class.php
index 1c25651c01..aa8979b4b1 100644
--- a/public/main/exercise/exercise.class.php
+++ b/public/main/exercise/exercise.class.php
@@ -1810,7 +1810,7 @@ class Exercise
             // random all questions
             if ($this->isRandom() && 0 == $this->isRandomByCat()) {
                 if (count($this->questionList) >= $this->random && $this->random > 0) {
-                    --$this->random;
+                    $this->random--;
                     $this->save();
                 }
             }
@@ -2898,7 +2898,7 @@ class Exercise
                 $sql = "DELETE FROM $table_track_e_attempt
                         WHERE exe_id = '".$item['exe_id']."'";
                 Database::query($sql);
-                ++$i;
+                $i++;
             }
         }
 
@@ -3174,7 +3174,7 @@ class Exercise
                             $showPreview = true;
                             if (!empty($myRemindList)) {
                                 $beforeId = null;
-                                for ($i = 0; $i < count($myRemindList); ++$i) {
+                                for ($i = 0; $i < count($myRemindList); $i++) {
                                     if (isset($myRemindList[$i]) && $myRemindList[$i] == $question_id) {
                                         $beforeId = isset($myRemindList[$i - 1]) ? $myRemindList[$i - 1] : null;
 
@@ -3190,7 +3190,7 @@ class Exercise
                                         if ($originalQuestionId == $beforeId) {
                                             break;
                                         }
-                                        ++$num;
+                                        $num++;
                                     }
                                     $prev_question = $num;
                                 }
@@ -3590,7 +3590,7 @@ class Exercise
         $answerDestination = null;
         $userAnsweredQuestion = false;
         $correctAnswerId = null;
-        for ($answerId = 1; $answerId <= $nbrAnswers; ++$answerId) {
+        for ($answerId = 1; $answerId <= $nbrAnswers; $answerId++) {
             $answer = $objAnswerTmp->selectAnswer($answerId);
             $answerComment = $objAnswerTmp->selectComment($answerId);
             $answerCorrect = $objAnswerTmp->isCorrect($answerId);
@@ -3880,7 +3880,7 @@ class Exercise
                             $switchable_answer_set = true;
                         }
                         $answer = '';
-                        for ($k = 0; $k < $last; ++$k) {
+                        for ($k = 0; $k < $last; $k++) {
                             $answer .= $pre_array[$k];
                         }
                         // splits weightings that are joined with a comma
@@ -3937,14 +3937,14 @@ class Exercise
                             $user_tags[] = $choice[$j];
                             // Put the contents of the [] answer tag into correct_tags[]
                             $correct_tags[] = api_substr($temp, 0, $pos);
-                            ++$j;
+                            $j++;
                             $temp = api_substr($temp, $pos + 1);
                         }
                         $answer = '';
                         $real_correct_tags = $correct_tags;
                         $chosen_list = [];
 
-                        for ($i = 0; $i < count($real_correct_tags); ++$i) {
+                        for ($i = 0; $i < count($real_correct_tags); $i++) {
                             if (0 == $i) {
                                 $answer .= $real_text[0];
                             }
@@ -4016,7 +4016,7 @@ class Exercise
                         // loop other all blanks words
                         if (!$switchableAnswerSet) {
                             // not switchable answer, must be in the same place than teacher order
-                            for ($i = 0; $i < count($listCorrectAnswers['words']); ++$i) {
+                            for ($i = 0; $i < count($listCorrectAnswers['words']); $i++) {
                                 $studentAnswer = isset($choice[$i]) ? $choice[$i] : '';
                                 $correctAnswer = $listCorrectAnswers['words'][$i];
 
@@ -4072,7 +4072,7 @@ class Exercise
                             $listTeacherAnswerTemp = $listCorrectAnswers['words'];
 
                             // for every teacher answer, check if there is a student answer
-                            for ($i = 0; $i < count($listStudentAnswerTemp); ++$i) {
+                            for ($i = 0; $i < count($listStudentAnswerTemp); $i++) {
                                 $studentAnswer = trim($listStudentAnswerTemp[$i]);
                                 $studentAnswerToShow = $studentAnswer;
 
@@ -4082,7 +4082,7 @@ class Exercise
                                 }
 
                                 $found = false;
-                                for ($j = 0; $j < count($listTeacherAnswerTemp); ++$j) {
+                                for ($j = 0; $j < count($listTeacherAnswerTemp); $j++) {
                                     $correctAnswer = $listTeacherAnswerTemp[$j];
                                     $type = FillBlanks::getFillTheBlankAnswerType($correctAnswer);
                                     if (FillBlanks::FILL_THE_BLANK_MENU == $type) {
@@ -4131,7 +4131,7 @@ class Exercise
                         $preArray = explode('@@', $answer);
                         $last = count($preArray) - 1;
                         $answer = '';
-                        for ($k = 0; $k < $last; ++$k) {
+                        for ($k = 0; $k < $last; $k++) {
                             $answer .= $preArray[$k];
                         }
                         $answerWeighting = [$answerWeighting];
@@ -4196,7 +4196,7 @@ class Exercise
                             $userTags[] = $choice[$j];
                             // put the contents of the [] answer tag into correct_tags[]
                             $correctTags[] = api_substr($temp, 0, $pos);
-                            ++$j;
+                            $j++;
                             $temp = api_substr($temp, $pos + 1);
                         }
                         $answer = '';
@@ -4205,7 +4205,7 @@ class Exercise
                         $expectedAnswer = '';
                         $calculatedChoice = '';
 
-                        for ($i = 0; $i < count($realCorrectTags); ++$i) {
+                        for ($i = 0; $i < count($realCorrectTags); $i++) {
                             if (0 == $i) {
                                 $answer .= $realText[0];
                             }
@@ -4544,7 +4544,7 @@ class Exercise
                                         break;
                                 }
                             }
-                            ++$counterAnswer;
+                            $counterAnswer++;
                         }
 
                         break 2; // break the switch and the "for" condition
@@ -5046,7 +5046,7 @@ class Exercise
                                         if ($debug > 0) {
                                             error_log(__LINE__.' - Overlap is '.$overlap.': OAR hit', 0);
                                         }
-                                        ++$organs_at_risk_hit;
+                                        $organs_at_risk_hit++;
                                         //show the feedback
                                         $next = 0;
                                         $comment = $answerDestination = $objAnswerTmp->selectComment($answerId);
@@ -5409,7 +5409,7 @@ class Exercise
                                         if ($debug > 0) {
                                             error_log(__LINE__.' - Overlap is '.$overlap.': OAR hit', 0);
                                         }
-                                        ++$organs_at_risk_hit;
+                                        $organs_at_risk_hit++;
                                         //show the feedback
                                         $next = 0;
                                         $comment = $answerDestination = $objAnswerTmp->selectComment($answerId);
@@ -5708,7 +5708,7 @@ class Exercise
                 if (0 != $choice) {
                     $reply = array_keys($choice);
                     $countReply = count($reply);
-                    for ($i = 0; $i < $countReply; ++$i) {
+                    for ($i = 0; $i < $countReply; $i++) {
                         $chosenAnswer = $reply[$i];
                         if (MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY == $answerType) {
                             if (0 != $choiceDegreeCertainty) {
@@ -5753,7 +5753,7 @@ class Exercise
             } elseif (MULTIPLE_ANSWER == $answerType || GLOBAL_MULTIPLE_ANSWER == $answerType) {
                 if (0 != $choice) {
                     $reply = array_keys($choice);
-                    for ($i = 0; $i < count($reply); ++$i) {
+                    for ($i = 0; $i < count($reply); $i++) {
                         $ans = $reply[$i];
                         Event::saveQuestionAttempt($questionScore, $ans, $quesId, $exeId, $i, $this->id);
                     }
@@ -5763,7 +5763,7 @@ class Exercise
             } elseif (MULTIPLE_ANSWER_COMBINATION == $answerType) {
                 if (0 != $choice) {
                     $reply = array_keys($choice);
-                    for ($i = 0; $i < count($reply); ++$i) {
+                    for ($i = 0; $i < count($reply); $i++) {
                         $ans = $reply[$i];
                         Event::saveQuestionAttempt($questionScore, $ans, $quesId, $exeId, $i, $this->id);
                     }
@@ -6618,7 +6618,7 @@ class Exercise
                             $add_question = false;
                             if (!in_array($media_id, $new_question_list)) {
                                 $new_question_list[$counter] = $media_id;
-                                ++$counter;
+                                $counter++;
                             }
 
                             break;
@@ -6626,7 +6626,7 @@ class Exercise
                     }
                     if ($add_question) {
                         $new_question_list[$counter] = $question_id;
-                        ++$counter;
+                        $counter++;
                     }
                 }
                 if ($expand_media_questions) {
@@ -6738,7 +6738,7 @@ class Exercise
                             $add_question = false;
                             if (!in_array($media_id, $new_question_list)) {
                                 $new_question_list[$counter] = $media_id;
-                                ++$counter;
+                                $counter++;
                             }
 
                             break;
@@ -6746,7 +6746,7 @@ class Exercise
                     }
                     if ($add_question) {
                         $new_question_list[$counter] = $question_id;
-                        ++$counter;
+                        $counter++;
                     }
                 }
                 if ($expand_media_questions) {
@@ -7087,11 +7087,11 @@ class Exercise
                     $link,
                     $counter
                 );
-                ++$counter;
-                ++$nextValue;
+                $counter++;
+                $nextValue++;
                 $wasMedia = false;
             }
-            ++$counterNoMedias;
+            $counterNoMedias++;
         }
         $html .= '</ul></div>';
 
@@ -7213,7 +7213,7 @@ class Exercise
                 if (999 == $mediaQuestionId) {
                     $counterNoMedias += count($questionList);
                 } else {
-                    ++$counterNoMedias;
+                    $counterNoMedias++;
                 }
 
                 $nextValue += count($questionList);
@@ -7251,7 +7251,7 @@ class Exercise
 
         // Normal question list render (medias compressed)
         foreach ($questionList as $questionId) {
-            ++$i;
+            $i++;
             // For sequential exercises
 
             if (ONE_PER_PAGE == $this->type) {
@@ -7310,8 +7310,8 @@ class Exercise
                                 $isLastQuestionInMedia,
                                 $questionList
                             );
-                            ++$letterCounter;
-                            ++$counter;
+                            $letterCounter++;
+                            $counter++;
                         }
                     }
                 } else {
@@ -7325,7 +7325,7 @@ class Exercise
                         null,
                         $questionList
                     );
-                    ++$i;
+                    $i++;
                 }
             } else {
                 // Normal question render.
@@ -7604,7 +7604,7 @@ class Exercise
 
             rsort($questionScoreList);
             // add the first $numberRandomQuestions value of score array to get max_score
-            for ($i = 0; $i < min($numberRandomQuestions, count($questionScoreList)); ++$i) {
+            for ($i = 0; $i < min($numberRandomQuestions, count($questionScoreList)); $i++) {
                 $out_max_score += $questionScoreList[$i];
             }
         } elseif ($this->random > 0 && $this->randomByCat > 0) {
@@ -7626,7 +7626,7 @@ class Exercise
             // here we've got an array with first key, the category_id, second key, score of question for this cat
             foreach ($tab_categories_scores as $tab_scores) {
                 rsort($tab_scores);
-                for ($i = 0; $i < min($numberRandomQuestions, count($tab_scores)); ++$i) {
+                for ($i = 0; $i < min($numberRandomQuestions, count($tab_scores)); $i++) {
                     $out_max_score += $tab_scores[$i];
                 }
             }
@@ -7788,7 +7788,7 @@ class Exercise
             return null;
         }
 
-        --$currentQuestion;
+        $currentQuestion--;
 
         if (!empty($result['question_list'])) {
             $answeredQuestions = [];
@@ -7806,7 +7806,7 @@ class Exercise
                         break;
                     }
                 }
-                ++$counterAnsweredQuestions;
+                $counterAnsweredQuestions++;
             }
 
             $counterRemindListQuestions = 0;
@@ -7819,7 +7819,7 @@ class Exercise
                             break;
                         }
                     }
-                    ++$counterRemindListQuestions;
+                    $counterRemindListQuestions++;
                 }
 
                 if ($counterRemindListQuestions < $currentQuestion) {
@@ -7857,13 +7857,13 @@ class Exercise
                 if (in_array($questionId, $mediaQuestionList)) {
                     return $position;
                 } else {
-                    ++$position;
+                    $position++;
                 }
             } else {
                 if ($id == $questionId) {
                     return $position;
                 } else {
-                    ++$position;
+                    $position++;
                 }
             }
         }
@@ -8137,12 +8137,12 @@ class Exercise
             if (true === $hideLabel) {
                 $answerUsed = (int) $array['used'];
                 $answerMissing = (int) $array['missing'] - $answerUsed;
-                for ($i = 1; $i <= $answerUsed; ++$i) {
+                for ($i = 1; $i <= $answerUsed; $i++) {
                     $html .= '<span class="score-img">'.
                         Display::return_icon('attempt-check.png', null, null, ICON_SIZE_SMALL).
                         '</span>';
                 }
-                for ($i = 1; $i <= $answerMissing; ++$i) {
+                for ($i = 1; $i <= $answerMissing; $i++) {
                     $html .= '<span class="score-img">'.
                         Display::return_icon('attempt-nocheck.png', null, null, ICON_SIZE_SMALL).
                         '</span>';
@@ -8998,7 +8998,7 @@ class Exercise
 
             // Just in case we save the order in other array
             $temp_question_list[$counter] = $new_object->question_id;
-            ++$counter;
+            $counter++;
         }
 
         if (!empty($temp_question_list)) {
diff --git a/public/main/exercise/exercise.php b/public/main/exercise/exercise.php
index 4afc5bd86f..8cb7a25934 100644
--- a/public/main/exercise/exercise.php
+++ b/public/main/exercise/exercise.php
@@ -270,9 +270,9 @@ if ($is_allowedToEdit && !empty($action)) {
             $currentPosition = $category->getPosition();
 
             if ('up_category' === $action) {
-                --$currentPosition;
+                $currentPosition--;
             } else {
-                ++$currentPosition;
+                $currentPosition++;
             }
             $category->setPosition($currentPosition);
             $em->persist($category);
@@ -408,7 +408,7 @@ if (false === api_get_configuration_value('allow_exercise_categories')) {
                     $up = Display::url(Display::return_icon('up_na.png'), '#');
                 }
                 $down = Display::url($downIcon, $modifyUrl.'&action=down_category&category_id_edit='.$categoryIdItem);
-                ++$counter;
+                $counter++;
                 if ($total === $counter) {
                     $down = Display::url(Display::return_icon('down_na.png'), '#');
                 }
diff --git a/public/main/exercise/exercise_reminder.php b/public/main/exercise/exercise_reminder.php
index d0a26072a6..01d01b56f7 100644
--- a/public/main/exercise/exercise_reminder.php
+++ b/public/main/exercise/exercise_reminder.php
@@ -222,7 +222,7 @@ foreach ($question_list as $questionId) {
         </div>
     </div>';
 
-    ++$counter;
+    $counter++;
     $questionTitle = $counter.'. '.strip_tags($objQuestionTmp->selectTitle());
     // Check if the question doesn't have an answer
     if (!in_array($questionId, $exercise_result)) {
diff --git a/public/main/exercise/exercise_report.php b/public/main/exercise/exercise_report.php
index b835cba162..5fd76716e4 100644
--- a/public/main/exercise/exercise_report.php
+++ b/public/main/exercise/exercise_report.php
@@ -184,7 +184,7 @@ if (isset($_REQUEST['comments']) &&
         $array_content_id_exe = $post_content_id;
     }
 
-    for ($i = 0; $i < $loop_in_track; ++$i) {
+    for ($i = 0; $i < $loop_in_track; $i++) {
         $my_marks = isset($_POST['marks_'.$array_content_id_exe[$i]]) ? $_POST['marks_'.$array_content_id_exe[$i]] : '';
         $my_comments = '';
         if (isset($_POST['comments_'.$array_content_id_exe[$i]])) {
diff --git a/public/main/exercise/exercise_result.class.php b/public/main/exercise/exercise_result.class.php
index 059bd39c37..948bfe5dda 100644
--- a/public/main/exercise/exercise_result.class.php
+++ b/public/main/exercise/exercise_result.class.php
@@ -6,7 +6,6 @@
  * Class ExerciseResult
  * which allows you to export exercises results in multiple presentation forms.
  *
- *
  * @author Yannick Warnier
  */
 class ExerciseResult
@@ -238,7 +237,7 @@ class ExerciseResult
                 }
 
                 $userWithResults[$result['excruid']] = 1;
-                ++$i;
+                $i++;
             }
         }
 
@@ -277,7 +276,7 @@ class ExerciseResult
                         $return[$i]['lp_name'] = null;
                         $return[$i]['is_user_subscribed'] = get_lang('Yes');
 
-                        ++$latestId;
+                        $latestId++;
                     }
                 }
             }
@@ -628,7 +627,7 @@ class ExerciseResult
             $list[$column][] = $row['status'];
             $list[$column][] = $row['lp_name'];
             $list[$column][] = $row['is_user_subscribed'];
-            ++$column;
+            $column++;
         }
         Export::arrayToXls($list, $filename);
 
diff --git a/public/main/exercise/exercise_result.php b/public/main/exercise/exercise_result.php
index 6a8deb664e..81c3e929d4 100644
--- a/public/main/exercise/exercise_result.php
+++ b/public/main/exercise/exercise_result.php
@@ -10,7 +10,6 @@ use ChamiloSession as Session;
  * that exercise.
  * Then it shows the results on the screen.
  *
- *
  * @author Olivier Brouckaert, main author
  * @author Roan Embrechts, some refactoring
  * @author Julio Montoya switchable fill in blank option added
@@ -158,7 +157,7 @@ if ($objExercise->selectAttempts() > 0) {
         }
         exit;
     } else {
-        ++$attempt_count;
+        $attempt_count++;
         $remainingAttempts = $objExercise->selectAttempts() - $attempt_count;
         if ($remainingAttempts) {
             $attemptMessage = sprintf(get_lang('Remaining %d attempts'), $remainingAttempts);
diff --git a/public/main/exercise/exercise_show.php b/public/main/exercise/exercise_show.php
index 5ae359e749..2f6b8d17ff 100644
--- a/public/main/exercise/exercise_show.php
+++ b/public/main/exercise/exercise_show.php
@@ -716,7 +716,7 @@ foreach ($questionList as $questionId) {
                     );
 
                     if (empty($model)) {
-                        for ($i = 0; $i <= $questionWeighting; ++$i) {
+                        for ($i = 0; $i <= $questionWeighting; $i++) {
                             $attributes = [];
                             if ($questionScore == $i) {
                                 $attributes['selected'] = 'selected';
@@ -839,12 +839,12 @@ foreach ($questionList as $questionId) {
         ];
         $check = $objQuestionTmp->isQuestionWaitingReview($scoreToReview);
         if (false === $check) {
-            ++$countPendingQuestions;
+            $countPendingQuestions++;
         }
     }
 
     unset($objAnswerTmp);
-    ++$i;
+    $i++;
 
     $contents = ob_get_clean();
     $question_content = '<div class="question_row">';
@@ -857,7 +857,7 @@ foreach ($questionList as $questionId) {
             $score
         );
     }
-    ++$counter;
+    $counter++;
     $question_content .= $contents;
     $question_content .= '</div>';
     $exercise_content .= Display::panel($question_content);
diff --git a/public/main/exercise/exercise_submit.php b/public/main/exercise/exercise_submit.php
index 04b863264f..c6b498282d 100644
--- a/public/main/exercise/exercise_submit.php
+++ b/public/main/exercise/exercise_submit.php
@@ -20,7 +20,6 @@ use ChamiloSession as Session;
  * Notice : This script is also used to show a question before modifying it by
  * the administrator
  *
- *
  * @author Olivier Brouckaert
  * @author Julio Montoya <gugli100@gmail.com>
  *            Fill in blank option added (2008)
@@ -432,7 +431,7 @@ if (empty($exercise_stat_info)) {
                 if ($last['question_id'] == $question) {
                     break;
                 }
-                ++$count;
+                $count++;
             }
             $current_question = $count;
         }
@@ -762,7 +761,7 @@ if (null === $current_question) {
         $current_question = $objExercise->getPositionInCompressedQuestionList($latestQuestionId);
     }
 } else {
-    ++$current_question;
+    $current_question++;
 }
 
 if (0 != $question_count) {
@@ -988,8 +987,8 @@ if (2 == $reminder) {
 
     if (!empty($myRemindList)) {
         // Checking which questions we are going to call from the remind list
-        for ($i = 0; $i < count($data_tracking); ++$i) {
-            for ($j = 0; $j < count($myRemindList); ++$j) {
+        for ($i = 0; $i < count($data_tracking); $i++) {
+            for ($j = 0; $j < count($myRemindList); $j++) {
                 if (!empty($remind_question_id)) {
                     if ($remind_question_id == $myRemindList[$j]) {
                         if ($remind_question_id == $data_tracking[$i]) {
@@ -1053,7 +1052,7 @@ if (!empty($error)) {
     $i = 0;
     if (!empty($questionList)) {
         foreach ($questionList as $questionId) {
-            ++$i;
+            $i++;
             $objQuestionTmp = Question::read($questionId);
             // for sequential exercises
 
@@ -1065,7 +1064,7 @@ if (!empty($error)) {
                     if (HOT_SPOT == $objQuestionTmp->selectType() ||
                         HOT_SPOT_DELINEATION == $objQuestionTmp->selectType()
                     ) {
-                        ++$number_of_hotspot_questions;
+                        $number_of_hotspot_questions++;
                     }
 
                     break;
@@ -1074,7 +1073,7 @@ if (!empty($error)) {
                 if (HOT_SPOT == $objQuestionTmp->selectType() ||
                     HOT_SPOT_DELINEATION == $objQuestionTmp->selectType()
                 ) {
-                    ++$number_of_hotspot_questions;
+                    $number_of_hotspot_questions++;
                 }
             }
         }
@@ -1396,7 +1395,7 @@ if (!empty($error)) {
         if (ONE_PER_PAGE == $objExercise->type) {
             // if it is not the right question, goes to the next loop iteration
             if ($current_question != $i) {
-                ++$i;
+                $i++;
 
                 continue;
             } else {
@@ -1409,7 +1408,7 @@ if (!empty($error)) {
                         // destruction of the Question object
                         unset($objQuestionTmp);
                         echo Display::return_message(get_lang('You already answered the question'));
-                        ++$i;
+                        $i++;
 
                         break;
                     }
@@ -1564,7 +1563,7 @@ if (!empty($error)) {
         echo Display::div($exerciseActions, ['class' => 'form-actions']);
         echo '</div>';
 
-        ++$i;
+        $i++;
         // for sequential exercises
         if (ONE_PER_PAGE == $objExercise->type) {
             // quits the loop
diff --git a/public/main/exercise/exercise_submit_modal.php b/public/main/exercise/exercise_submit_modal.php
index af3a0b1377..17338dcc93 100644
--- a/public/main/exercise/exercise_submit_modal.php
+++ b/public/main/exercise/exercise_submit_modal.php
@@ -357,7 +357,7 @@ if (!empty($links)) {
     echo '<div style="padding-left: 450px"><h5>'.$links.'</h5></div>';
     echo '</div>';
 } else {
-    ++$questionNum;
+    $questionNum++;
     echo '<script>
             window.location.href = "exercise_submit.php?exerciseId='.$exerciseId.'&num='.$questionNum.'&'.api_get_cidreq().'";
         </script>';
diff --git a/public/main/exercise/export/aiken/aiken_import.inc.php b/public/main/exercise/export/aiken/aiken_import.inc.php
index 865b592247..eb78809a50 100644
--- a/public/main/exercise/export/aiken/aiken_import.inc.php
+++ b/public/main/exercise/export/aiken/aiken_import.inc.php
@@ -209,7 +209,7 @@ function aiken_import_exercise($file)
             }
 
             foreach ($question_array['answer'] as $key => $answers) {
-                ++$key;
+                $key++;
                 $answer->new_answer[$key] = $answers['value'];
                 $answer->new_position[$key] = $key;
                 $answer->new_comment[$key] = '';
@@ -359,7 +359,7 @@ function aiken_parse_file(&$exercise_info, $exercisePath, $file, $questionFile)
 
                 return 'ExerciseAikenErrorNoAnswerOptionGiven';
             }
-            ++$question_index;
+            $question_index++;
             //emptying answers array when moving to next question
             $answers_array = [];
             $new_question = true;
diff --git a/public/main/exercise/export/exercise_import.inc.php b/public/main/exercise/export/exercise_import.inc.php
index 7cfdcf7804..07ee69e9b4 100644
--- a/public/main/exercise/export/exercise_import.inc.php
+++ b/public/main/exercise/export/exercise_import.inc.php
@@ -225,7 +225,7 @@ function import_exercise($file)
                         $i = $split[1];
                     } else {
                         $i = $j;
-                        ++$j;
+                        $j++;
                         $matchAnswerIds[$key] = $j;
                     }
 
@@ -455,7 +455,7 @@ function parseQti2($xmlData)
                 if (!isset($currentMatchSet)) {
                     $currentMatchSet = 1;
                 } else {
-                    ++$currentMatchSet;
+                    $currentMatchSet++;
                 }
                 $exerciseInfo['question'][$currentQuestionIdent]['answer'][$currentMatchSet] = [];
 
@@ -707,7 +707,7 @@ function qtiProcessManifest($filePath)
     ];
     $tableDocuments = Database::get_course_table(TABLE_DOCUMENT);
     $countResources = count($xml->resources->resource->file);
-    for ($i = 0; $i < $countResources; ++$i) {
+    for ($i = 0; $i < $countResources; $i++) {
         $file = $xml->resources->resource->file[$i];
         $href = '';
         foreach ($file->attributes() as $key => $value) {
diff --git a/public/main/exercise/export/qti2/qti2_classes.php b/public/main/exercise/export/qti2/qti2_classes.php
index 6cfd9644bf..3119441ba9 100644
--- a/public/main/exercise/export/qti2/qti2_classes.php
+++ b/public/main/exercise/export/qti2/qti2_classes.php
@@ -253,7 +253,7 @@ class ImsAnswerMatching extends Answer implements ImsAnswerInterface
                 $out .= '<simpleAssociableChoice identifier="right_'.$i.'" >
                         <![CDATA['.formatExerciseQtiText($rightElement['answer']).']]>
                         </simpleAssociableChoice>'."\n";
-                ++$i;
+                $i++;
             }
         }
         $out .= '  </simpleMatchSet>'."\n";
@@ -277,7 +277,7 @@ class ImsAnswerMatching extends Answer implements ImsAnswerInterface
                         $out .= '      <value>left_'.$leftKey.' right_'.$i.'</value>'."\n";
                         $gradeArray['left_'.$leftKey.' right_'.$i] = $leftElement['grade'];
                     }
-                    ++$i;
+                    $i++;
                 }
             }
         }
diff --git a/public/main/exercise/export/qti2/qti2_export.php b/public/main/exercise/export/qti2/qti2_export.php
index 9996af46b6..404c7ad1c1 100644
--- a/public/main/exercise/export/qti2/qti2_export.php
+++ b/public/main/exercise/export/qti2/qti2_export.php
@@ -106,7 +106,6 @@ class ImsAssessmentItem
      *
      * This is a default behaviour, some classes may want to override this.
      *
-     *
      * @return string string, the XML flow for an Item
      */
     public function export($standalone = false)
@@ -392,7 +391,6 @@ class ImsItem
      *
      * This is a default behaviour, some classes may want to override this.
      *
-     *
      * @return string string, the XML flow for an Item
      *
      * @author Amand Tihon <amand@alrj.org>
diff --git a/public/main/exercise/export/scorm/ScormAnswerFillInBlanks.php b/public/main/exercise/export/scorm/ScormAnswerFillInBlanks.php
index c2e1011a56..616e1860ce 100644
--- a/public/main/exercise/export/scorm/ScormAnswerFillInBlanks.php
+++ b/public/main/exercise/export/scorm/ScormAnswerFillInBlanks.php
@@ -29,7 +29,7 @@ class ScormAnswerFillInBlanks extends Answer
         // display empty [input] with the right width for student to fill it
         $answer = '';
         $answerList = [];
-        for ($i = 0; $i < count($listAnswerInfo['common_words']) - 1; ++$i) {
+        for ($i = 0; $i < count($listAnswerInfo['common_words']) - 1; $i++) {
             // display the common words
             $answer .= $listAnswerInfo['common_words'][$i];
             // display the blank word
diff --git a/public/main/exercise/export/scorm/ScormAnswerMatching.php b/public/main/exercise/export/scorm/ScormAnswerMatching.php
index 8dfe3fec39..e1572a5819 100644
--- a/public/main/exercise/export/scorm/ScormAnswerMatching.php
+++ b/public/main/exercise/export/scorm/ScormAnswerMatching.php
@@ -29,7 +29,7 @@ class ScormAnswerMatching extends Answer
         // Options (A, B, C, ...) that will be put into the list-box
         $options = [];
         $letter = 'A';
-        for ($answerId = 1; $answerId <= $nbrAnswers; ++$answerId) {
+        for ($answerId = 1; $answerId <= $nbrAnswers; $answerId++) {
             $answerCorrect = $this->isCorrect($answerId);
             $answer = $this->selectAnswer($answerId);
             $realAnswerId = $this->selectAutoId($answerId);
@@ -37,7 +37,7 @@ class ScormAnswerMatching extends Answer
                 $options[$realAnswerId]['Lettre'] = $letter;
                 // answers that will be shown at the right side
                 $options[$realAnswerId]['Reponse'] = $answer;
-                ++$letter;
+                $letter++;
             }
         }
 
@@ -46,7 +46,7 @@ class ScormAnswerMatching extends Answer
         $jstmpc = '';
 
         // Answers
-        for ($answerId = 1; $answerId <= $nbrAnswers; ++$answerId) {
+        for ($answerId = 1; $answerId <= $nbrAnswers; $answerId++) {
             $identifier = 'question_'.$questionId.'_matching_';
             $answer = $this->selectAnswer($answerId);
             $answerCorrect = $this->isCorrect($answerId);
@@ -80,7 +80,7 @@ class ScormAnswerMatching extends Answer
                     $weight = $myWeight[0];
                 }
                 $jstmpw .= 'questions_answers_ponderation['.$questionId.']['.$counter.'] = '.$weight.";\n";
-                ++$counter;
+                $counter++;
             }
         }
 
diff --git a/public/main/exercise/export/scorm/ScormAnswerMultipleChoice.php b/public/main/exercise/export/scorm/ScormAnswerMultipleChoice.php
index b73fa94672..10c5bf46cd 100644
--- a/public/main/exercise/export/scorm/ScormAnswerMultipleChoice.php
+++ b/public/main/exercise/export/scorm/ScormAnswerMultipleChoice.php
@@ -45,7 +45,7 @@ class ScormAnswerMultipleChoice extends Answer
                 }
                 $jstmpw .= 'questions_answers_ponderation['.$questionId.']['.$i.'] = '.$this->weighting[$i].';';
                 $jstmpw .= 'questions_answers_correct['.$questionId.']['.$i.'] = '.$this->correct[$i].';';
-                ++$id;
+                $id++;
             }
             $js[] = 'questions_answers['.$questionId.'] = new Array('.substr($jstmp, 0, -1).');'."\n";
             $js[] = 'questions_types['.$questionId.'] = \'mcma\';'."\n";
@@ -73,7 +73,7 @@ class ScormAnswerMultipleChoice extends Answer
                 }
                 $jstmpw .= 'questions_answers_ponderation['.$questionId.']['.$i.'] = '.$this->weighting[$i].';';
                 $jstmpw .= 'questions_answers_correct['.$questionId.']['.$i.'] = '.$this->correct[$i].';';
-                ++$id;
+                $id++;
             }
             $js[] = 'questions_answers['.$questionId.'] = new Array('.substr($jstmp, 0, -1).');';
             $js[] = 'questions_types['.$questionId.'] = "exact";';
@@ -100,7 +100,7 @@ class ScormAnswerMultipleChoice extends Answer
                 }
                 $jstmpw .= 'questions_answers_ponderation['.$questionId.']['.$i.'] = '.$this->weighting[$i].';';
                 $jstmpw .= 'questions_answers_correct['.$questionId.']['.$i.'] = '.$this->correct[$i].';';
-                ++$id;
+                $id++;
             }
             $js[] = 'questions_answers['.$questionId.'] = new Array('.substr($jstmp, 0, -1).');';
             $js[] = 'questions_types['.$questionId.'] = \'mcua\';';
diff --git a/public/main/exercise/export/scorm/ScormExercise.php b/public/main/exercise/export/scorm/ScormExercise.php
index 37a86f7815..1c05886683 100644
--- a/public/main/exercise/export/scorm/ScormExercise.php
+++ b/public/main/exercise/export/scorm/ScormExercise.php
@@ -115,7 +115,6 @@ class ScormExercise
      *
      * This is a default behaviour, some classes may want to override this.
      *
-     *
      * @return string string, the XML flow for an Item
      */
     public function export()
@@ -173,7 +172,7 @@ class ScormExercise
             list($jstmp, $htmltmp) = $scormQuestion->exportQuestionToScorm($q, $counter);
             $js .= $jstmp."\n";
             $html .= $htmltmp."\n";
-            ++$counter;
+            $counter++;
         }
 
         return [$js, $html];
diff --git a/public/main/exercise/export/scorm/scorm_classes.php b/public/main/exercise/export/scorm/scorm_classes.php
index 696b437d0d..6518221722 100644
--- a/public/main/exercise/export/scorm/scorm_classes.php
+++ b/public/main/exercise/export/scorm/scorm_classes.php
@@ -109,7 +109,7 @@ class ScormAnswerHotspot extends Answer
             border: 1px solid #4271b5; 
             height: 448px; 
             width: 200px;"><b>'.get_lang('Image zones').'</b><ol>';
-        for ($answerId = 1; $answerId <= $nbrAnswers; ++$answerId) {
+        for ($answerId = 1; $answerId <= $nbrAnswers; $answerId++) {
             $answerList .= '<li>'.$this->selectAnswer($answerId).'</li>';
         }
         $answerList .= '</ol></div>';
diff --git a/public/main/exercise/fill_blanks.class.php b/public/main/exercise/fill_blanks.class.php
index ff15aa865b..58803f885b 100644
--- a/public/main/exercise/fill_blanks.class.php
+++ b/public/main/exercise/fill_blanks.class.php
@@ -429,7 +429,7 @@ class FillBlanks extends Question
         if ($nb > 0) {
             $answer .= '::';
             // weighting
-            for ($i = 0; $i < $nb; ++$i) {
+            for ($i = 0; $i < $nb; $i++) {
                 // enter the weighting of word $i
                 $answer .= $form->getSubmitValue('weighting['.$i.']');
                 // not the last word, add ","
@@ -442,7 +442,7 @@ class FillBlanks extends Question
 
             // input width
             $answer .= ':';
-            for ($i = 0; $i < $nb; ++$i) {
+            for ($i = 0; $i < $nb; $i++) {
                 // enter the width of input for word $i
                 $answer .= $form->getSubmitValue('sizeofinput['.$i.']');
                 // not the last word, add ","
@@ -754,7 +754,7 @@ class FillBlanks extends Question
         if (count($listDetails) < 3) {
             $listWeightings = explode(',', $listDetails[0]);
             $listSizeOfInput = [];
-            for ($i = 0; $i < count($listWeightings); ++$i) {
+            for ($i = 0; $i < count($listWeightings); $i++) {
                 $listSizeOfInput[] = 200;
             }
             $blankSeparatorNumber = 0; // 0 is [...]
@@ -791,7 +791,7 @@ class FillBlanks extends Question
                 $listWords[0],
                 function (&$value, $key, $tabBlankChar) {
                     $trimChars = '';
-                    for ($i = 0; $i < count($tabBlankChar); ++$i) {
+                    for ($i = 0; $i < count($tabBlankChar); $i++) {
                         $trimChars .= $tabBlankChar[$i];
                     }
                     $value = trim($value, $trimChars);
@@ -813,17 +813,17 @@ class FillBlanks extends Question
         $listBrackets = [];
         $listWords = [];
         if ($isStudentAnswer) {
-            for ($i = 0; $i < count($listAnswerResults['words']); ++$i) {
+            for ($i = 0; $i < count($listAnswerResults['words']); $i++) {
                 $listBrackets[] = $listAnswerResults['words_with_bracket'][$i];
                 $listWords[] = $listAnswerResults['words'][$i];
                 if ($i + 1 < count($listAnswerResults['words'])) {
                     // should always be
-                    ++$i;
+                    $i++;
                 }
                 $listAnswerResults['student_answer'][] = $listAnswerResults['words'][$i];
                 if ($i + 1 < count($listAnswerResults['words'])) {
                     // should always be
-                    ++$i;
+                    $i++;
                 }
                 $listAnswerResults['student_score'][] = $listAnswerResults['words'][$i];
             }
@@ -963,7 +963,7 @@ class FillBlanks extends Question
             // for each bracket, if student has at least one answer ( choice > -2) then he pass the question
             foreach ($list as $choice) {
                 if ($choice > -2 && !$found) {
-                    ++$outRes;
+                    $outRes++;
                     $found = true;
                 }
             }
@@ -985,7 +985,7 @@ class FillBlanks extends Question
         $separatorEnd = $listWithStudentAnswer['blank_separator_end'];
         // lets rebuild the sentence with [correct answer][student answer][answer is correct]
         $result = '';
-        for ($i = 0; $i < count($listWithStudentAnswer['common_words']) - 1; ++$i) {
+        for ($i = 0; $i < count($listWithStudentAnswer['common_words']) - 1; $i++) {
             $answerValue = null;
             if (isset($listWithStudentAnswer['student_answer'][$i])) {
                 $answerValue = $listWithStudentAnswer['student_answer'][$i];
@@ -1142,7 +1142,7 @@ class FillBlanks extends Question
 
         // rebuild the answer with good HTML style
         // this is the student answer, right or wrong
-        for ($i = 0; $i < count($listStudentAnswerInfo['student_answer']); ++$i) {
+        for ($i = 0; $i < count($listStudentAnswerInfo['student_answer']); $i++) {
             if (1 == $listStudentAnswerInfo['student_score'][$i]) {
                 $listStudentAnswerInfo['student_answer'][$i] = self::getHtmlRightAnswer(
                     $listStudentAnswerInfo['student_answer'][$i],
@@ -1163,7 +1163,7 @@ class FillBlanks extends Question
         }
 
         // rebuild the sentence with student answer inserted
-        for ($i = 0; $i < count($listStudentAnswerInfo['common_words']); ++$i) {
+        for ($i = 0; $i < count($listStudentAnswerInfo['common_words']); $i++) {
             $result .= isset($listStudentAnswerInfo['common_words'][$i]) ? $listStudentAnswerInfo['common_words'][$i] : '';
             $studentLabel = isset($listStudentAnswerInfo['student_answer'][$i]) ? $listStudentAnswerInfo['student_answer'][$i] : '';
             $result .= $studentLabel;
@@ -1233,7 +1233,7 @@ class FillBlanks extends Question
                 $listPossibleAnswers = self::getFillTheBlankMenuAnswers($correct, false);
                 $correctAnswerHtml .= "<span class='correct-answer'><strong>".$listPossibleAnswers[0].'</strong>';
                 $correctAnswerHtml .= ' (';
-                for ($i = 1; $i < count($listPossibleAnswers); ++$i) {
+                for ($i = 1; $i < count($listPossibleAnswers); $i++) {
                     $correctAnswerHtml .= $listPossibleAnswers[$i];
                     if ($i != count($listPossibleAnswers) - 1) {
                         $correctAnswerHtml .= ' | ';
diff --git a/public/main/exercise/global_multiple_answer.class.php b/public/main/exercise/global_multiple_answer.class.php
index 5ea69568f3..8068f8006f 100644
--- a/public/main/exercise/global_multiple_answer.class.php
+++ b/public/main/exercise/global_multiple_answer.class.php
@@ -76,7 +76,7 @@ class GlobalMultipleAnswer extends Question
         $scoreG = 0; //Global
 
         /* boucle pour sauvegarder les donn�es dans le tableau defaults */
-        for ($i = 1; $i <= $nb_answers; ++$i) {
+        for ($i = 1; $i <= $nb_answers; $i++) {
             /* si la reponse est de type objet */
             if (is_object($answer)) {
                 $defaults['answer['.$i.']'] = $answer->answer[$i];
@@ -209,10 +209,10 @@ class GlobalMultipleAnswer extends Question
 
         // Reponses correctes
         $nbr_corrects = 0;
-        for ($i = 1; $i <= $nb_answers; ++$i) {
+        for ($i = 1; $i <= $nb_answers; $i++) {
             $goodAnswer = trim($form->getSubmitValue('correct['.$i.']'));
             if ($goodAnswer) {
-                ++$nbr_corrects;
+                $nbr_corrects++;
             }
         }
         // Set question weighting (score total)
@@ -228,7 +228,7 @@ class GlobalMultipleAnswer extends Question
         // cr�ation variable pour r�cuperer la valeur de la coche pour la prise en compte des n�gatifs
         $test = $form->getSubmitValue('pts');
 
-        for ($i = 1; $i <= $nb_answers; ++$i) {
+        for ($i = 1; $i <= $nb_answers; $i++) {
             $answer = trim($form->getSubmitValue('answer['.$i.']'));
             $comment = trim($form->getSubmitValue('comment['.$i.']'));
             $goodAnswer = trim($form->getSubmitValue('correct['.$i.']'));
diff --git a/public/main/exercise/hotspot_actionscript.as.php b/public/main/exercise/hotspot_actionscript.as.php
index 216b0c0721..79a9928b2d 100644
--- a/public/main/exercise/hotspot_actionscript.as.php
+++ b/public/main/exercise/hotspot_actionscript.as.php
@@ -117,7 +117,7 @@ while ($hotspot = Database::fetch_assoc($result)) {
 
     // This is a good answer, count + 1 for nmbr of clicks
     if ($hotspot['hotspot_type'] > 0) {
-        ++$nmbrTries;
+        $nmbrTries++;
     }
 
     $hotSpot['coord'] = $hotspot['hotspot_coordinates'];
diff --git a/public/main/exercise/hotspot_actionscript_admin.as.php b/public/main/exercise/hotspot_actionscript_admin.as.php
index ddd212f430..866b62c080 100644
--- a/public/main/exercise/hotspot_actionscript_admin.as.php
+++ b/public/main/exercise/hotspot_actionscript_admin.as.php
@@ -9,7 +9,6 @@ use ChamiloSession as Session;
 /**
  * This file generates the ActionScript variables code used by the HotSpot .swf.
  *
- *
  * @author Toon Keppens
  */
 require_once __DIR__.'/../inc/global.inc.php';
@@ -67,7 +66,7 @@ $answer_type = $objQuestion->getType();
 $answers = Session::read('tmp_answers');
 $nbrAnswers = count($answers['answer']);
 
-for ($i = 1; $i <= $nbrAnswers; ++$i) {
+for ($i = 1; $i <= $nbrAnswers; $i++) {
     $hotSpot = [];
     $hotSpot['id'] = null;
     $hotSpot['answer'] = $answers['answer'][$i];
@@ -102,7 +101,7 @@ for ($i = 1; $i <= $nbrAnswers; ++$i) {
 
     // This is a good answer, count + 1 for nmbr of clicks
     if ($answers['weighting'][$i] > 0) {
-        ++$nmbrTries;
+        $nmbrTries++;
     }
 
     $hotSpot['coord'] = $answers['hotspot_coordinates'][$i];
diff --git a/public/main/exercise/hotspot_admin.inc.php b/public/main/exercise/hotspot_admin.inc.php
index 6444551402..67cfcc1116 100644
--- a/public/main/exercise/hotspot_admin.inc.php
+++ b/public/main/exercise/hotspot_admin.inc.php
@@ -7,7 +7,6 @@ use ChamiloSession as Session;
  * This script allows to manage answers. It is included from the
  * script admin.php.
  *
- *
  * @author  Toon Keppens
  */
 $modifyAnswers = (int) $_GET['hotspotadmin'];
@@ -75,7 +74,7 @@ if ($submitAnswers || $buttonBack) {
             echo '$submitAnswers or $buttonBack was set'."<br />\n";
         }
         $questionWeighting = $nbrGoodAnswers = 0;
-        for ($i = 1; $i <= $nbrAnswers; ++$i) {
+        for ($i = 1; $i <= $nbrAnswers; $i++) {
             if ($debug > 0) {
                 echo str_repeat('&nbsp;', 4).'$answerType is HOT_SPOT'."<br />\n";
             }
@@ -112,7 +111,7 @@ if ($submitAnswers || $buttonBack) {
         }  // end for()
 
         if (empty($msgErr)) {
-            for ($i = 1; $i <= $nbrAnswers; ++$i) {
+            for ($i = 1; $i <= $nbrAnswers; $i++) {
                 if ($debug > 0) {
                     echo str_repeat('&nbsp;', 4).'$answerType is HOT_SPOT'."<br />\n";
                 }
@@ -167,7 +166,7 @@ if ($submitAnswers || $buttonBack) {
         $threadhold2 = $_POST['threadhold2'];
         $threadhold3 = $_POST['threadhold3'];
 
-        for ($i = 1; $i <= $nbrAnswers; ++$i) {
+        for ($i = 1; $i <= $nbrAnswers; $i++) {
             $reponse[$i] = trim($reponse[$i]);
             $comment[$i] = trim($comment[$i]);
             $weighting[$i] = $weighting[$i];
@@ -279,7 +278,7 @@ if ($submitAnswers || $buttonBack) {
         $destination_noerror = $threadhold_total.'@@'.$try_str.'@@'.$lp_str.'@@'.$question_str.'@@'.$url_str;
 
         if (empty($msgErr)) {
-            for ($i = 1; $i <= $nbrAnswers; ++$i) {
+            for ($i = 1; $i <= $nbrAnswers; $i++) {
                 if ($debug > 0) {
                     echo str_repeat('&nbsp;', 4).'$answerType is HOT_SPOT'."<br />\n";
                 }
@@ -345,7 +344,7 @@ if (isset($modifyAnswers)) {
 
     if (HOT_SPOT_DELINEATION == $answerType) {
         $try = isset($_POST['try']) ? $_POST['try'] : [];
-        for ($i = 1; $i <= $nbrAnswers; ++$i) {
+        for ($i = 1; $i <= $nbrAnswers; $i++) {
             if (isset($try[$i]) && 'on' == $try[$i]) {
                 $try[$i] = 1;
             } else {
@@ -366,7 +365,7 @@ if (isset($modifyAnswers)) {
             // the magic happens here ...
             // we do this to not count the if no error section
             if ($nbrAnswers >= 2) {
-                --$nbrAnswers;
+                $nbrAnswers--;
             }
         }
 
@@ -378,7 +377,7 @@ if (isset($modifyAnswers)) {
         $destination_items = [];
         $destination = [];
 
-        for ($i = 1; $i <= $nbrAnswers; ++$i) {
+        for ($i = 1; $i <= $nbrAnswers; $i++) {
             $reponse[$i] = $objAnswer->selectAnswer($i);
 
             if (EXERCISE_FEEDBACK_TYPE_EXAM != $objExercise->getFeedbackType()) {
@@ -448,7 +447,7 @@ if (isset($modifyAnswers)) {
             $lest_answer = 1;
             // At least 1 answer
             if ($nbrAnswers > $lest_answer) {
-                --$nbrAnswers;
+                $nbrAnswers--;
                 // Remove the last answer
                 $tmp = array_pop($_SESSION['tmp_answers']['answer']);
                 $tmp = array_pop($_SESSION['tmp_answers']['comment']);
@@ -465,7 +464,7 @@ if (isset($modifyAnswers)) {
         } else {
             // At least 1 answer
             if ($nbrAnswers > 1) {
-                --$nbrAnswers;
+                $nbrAnswers--;
                 // Remove the last answer
                 $tmp = array_pop($_SESSION['tmp_answers']['answer']);
                 if (EXERCISE_FEEDBACK_TYPE_EXAM != $objExercise->getFeedbackType()) {
@@ -484,7 +483,7 @@ if (isset($modifyAnswers)) {
 
     if ($moreAnswers) {
         if ($nbrAnswers < 12) {
-            ++$nbrAnswers;
+            $nbrAnswers++;
 
             // Add a new answer
             $_SESSION['tmp_answers']['answer'][] = '';
@@ -505,7 +504,7 @@ if (isset($modifyAnswers)) {
     if ($moreOARAnswers) {
         if ($nbrAnswers < 12) {
             // Add a new answer
-            ++$nbrAnswers;
+            $nbrAnswers++;
 
             $_SESSION['tmp_answers']['answer'][] = '';
             $_SESSION['tmp_answers']['comment'][] = '';
@@ -626,7 +625,7 @@ if (isset($modifyAnswers)) {
     // Loading list of LPs
     $flat_list = $list->get_flat_list();
 
-    for ($i = 1; $i <= $nbrAnswers; ++$i) {
+    for ($i = 1; $i <= $nbrAnswers; $i++) {
         // is an delineation
         if (HOT_SPOT_DELINEATION == $answerType) {
             $option_lp = '';
@@ -676,7 +675,7 @@ if (isset($modifyAnswers)) {
             //-------- IF it is a delineation
             if ('delineation' == $_SESSION['tmp_answers']['hotspot_type'][$i]) {
                 $option1 = $option2 = $option3 = '';
-                for ($k = 1; $k <= 100; ++$k) {
+                for ($k = 1; $k <= 100; $k++) {
                     $selected1 = $selected2 = $selected3 = '';
                     if ($k == $threadhold1[$i]) {
                         $selected1 = 'selected="selected"';
diff --git a/public/main/exercise/hotspot_answers.as.php b/public/main/exercise/hotspot_answers.as.php
index d41819ef58..c1d23a1bab 100644
--- a/public/main/exercise/hotspot_answers.as.php
+++ b/public/main/exercise/hotspot_answers.as.php
@@ -10,7 +10,6 @@ use Chamilo\CourseBundle\Entity\CQuizQuestion;
 /**
  * This file generates a json answer to the question preview.
  *
- *
  * @author Toon Keppens, Julio Montoya adding hotspot "medical" support
  */
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/exercise/hotspot_save.inc.php b/public/main/exercise/hotspot_save.inc.php
index fc05b9e562..f48a8e6c36 100644
--- a/public/main/exercise/hotspot_save.inc.php
+++ b/public/main/exercise/hotspot_save.inc.php
@@ -31,7 +31,7 @@ if ('poly' == $_GET['type'] || 'delineation' == $_GET['type'] || 'oar' == $_GET[
             $delimiter = '|';
         }
         $hotspot_coordinates .= $coord.$delimiter;
-        ++$i;
+        $i++;
     }
     $hotspot_coordinates = api_substr($hotspot_coordinates, 0, -2);
 }
diff --git a/public/main/exercise/hotspot_savescore.inc.php b/public/main/exercise/hotspot_savescore.inc.php
index 3fc053afd1..60939b774c 100644
--- a/public/main/exercise/hotspot_savescore.inc.php
+++ b/public/main/exercise/hotspot_savescore.inc.php
@@ -7,7 +7,6 @@ use ChamiloSession as Session;
 /**
  *	This file saves every click in the hotspot tool into track_e_hotspots.
  *
- *
  * 	@author Toon Keppens
  *
  * 	@version $Id: admin.php 10680 2007-01-11 21:26:23Z pcool $
diff --git a/public/main/exercise/hotspot_updatescore.inc.php b/public/main/exercise/hotspot_updatescore.inc.php
index 5b0b82b36f..7b139a2d7b 100644
--- a/public/main/exercise/hotspot_updatescore.inc.php
+++ b/public/main/exercise/hotspot_updatescore.inc.php
@@ -7,7 +7,6 @@ use ChamiloSession as Session;
 /**
  *	This file saves every click in the hotspot tool into track_e_hotspots.
  *
- *
  * 	@author Toon Keppens
  *
  * 	@version $Id: admin.php 10680 2007-01-11 21:26:23Z pcool $
diff --git a/public/main/exercise/matching.class.php b/public/main/exercise/matching.class.php
index ad3339e892..9f6cdd4093 100644
--- a/public/main/exercise/matching.class.php
+++ b/public/main/exercise/matching.class.php
@@ -39,11 +39,11 @@ class Matching extends Question
             $answer = new Answer($this->id);
             $answer->read();
             if ($answer->nbrAnswers > 0) {
-                for ($i = 1; $i <= $answer->nbrAnswers; ++$i) {
+                for ($i = 1; $i <= $answer->nbrAnswers; $i++) {
                     $correct = $answer->isCorrect($i);
                     if (empty($correct)) {
                         $matches[$answer->selectAutoId($i)] = chr(64 + $counter);
-                        ++$counter;
+                        $counter++;
                     }
                 }
             }
@@ -53,24 +53,24 @@ class Matching extends Question
             $nb_matches = $form->getSubmitValue('nb_matches');
             $nb_options = $form->getSubmitValue('nb_options');
             if (isset($_POST['lessOptions'])) {
-                --$nb_matches;
-                --$nb_options;
+                $nb_matches--;
+                $nb_options--;
             }
             if (isset($_POST['moreOptions'])) {
-                ++$nb_matches;
-                ++$nb_options;
+                $nb_matches++;
+                $nb_options++;
             }
         } elseif (!empty($this->id)) {
             if ($answer->nbrAnswers > 0) {
                 $nb_matches = $nb_options = 0;
-                for ($i = 1; $i <= $answer->nbrAnswers; ++$i) {
+                for ($i = 1; $i <= $answer->nbrAnswers; $i++) {
                     if ($answer->isCorrect($i)) {
-                        ++$nb_matches;
+                        $nb_matches++;
                         $defaults['answer['.$nb_matches.']'] = $answer->selectAnswer($i);
                         $defaults['weighting['.$nb_matches.']'] = float_format($answer->selectWeighting($i), 1);
                         $defaults['matches['.$nb_matches.']'] = $answer->correct[$i];
                     } else {
-                        ++$nb_options;
+                        $nb_options++;
                         $defaults['option['.$nb_options.']'] = $answer->selectAnswer($i);
                     }
                 }
@@ -84,12 +84,12 @@ class Matching extends Question
         }
 
         if (empty($matches)) {
-            for ($i = 1; $i <= $nb_options; ++$i) {
+            for ($i = 1; $i <= $nb_options; $i++) {
                 // fill the array with A, B, C.....
                 $matches[$i] = chr(64 + $i);
             }
         } else {
-            for ($i = $counter; $i <= $nb_options; ++$i) {
+            for ($i = $counter; $i <= $nb_options; $i++) {
                 // fill the array with A, B, C.....
                 $matches[$i] = chr(64 + $i);
             }
@@ -126,7 +126,7 @@ class Matching extends Question
             'Height' => '125',
         ];
 
-        for ($i = 1; $i <= $nb_matches; ++$i) {
+        for ($i = 1; $i <= $nb_matches; $i++) {
             $renderer = &$form->defaultRenderer();
             $renderer->setElementTemplate(
                 '<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error -->{element}</td>',
@@ -189,7 +189,7 @@ class Matching extends Question
             );
         }
 
-        for ($i = 1; $i <= $nb_options; ++$i) {
+        for ($i = 1; $i <= $nb_options; $i++) {
             $renderer = &$form->defaultRenderer();
             $renderer->setElementTemplate(
                 '<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error -->{element}</td>',
@@ -244,15 +244,15 @@ class Matching extends Question
         $objAnswer = new Answer($this->id);
 
         // Insert the options
-        for ($i = 1; $i <= $nb_options; ++$i) {
-            ++$position;
+        for ($i = 1; $i <= $nb_options; $i++) {
+            $position++;
             $option = $form->getSubmitValue('option['.$i.']');
             $objAnswer->createAnswer($option, 0, '', 0, $position);
         }
 
         // Insert the answers
-        for ($i = 1; $i <= $nb_matches; ++$i) {
-            ++$position;
+        for ($i = 1; $i <= $nb_matches; $i++) {
+            $position++;
             $answer = $form->getSubmitValue('answer['.$i.']');
             $matches = $form->getSubmitValue('matches['.$i.']');
             $weighting = $form->getSubmitValue('weighting['.$i.']');
diff --git a/public/main/exercise/multiple_answer.class.php b/public/main/exercise/multiple_answer.class.php
index 5cdd10883e..2168db63c1 100644
--- a/public/main/exercise/multiple_answer.class.php
+++ b/public/main/exercise/multiple_answer.class.php
@@ -76,7 +76,7 @@ class MultipleAnswer extends Question
             echo Display::return_message(get_lang('You have to create at least one answer'));
         }
 
-        for ($i = 1; $i <= $nb_answers; ++$i) {
+        for ($i = 1; $i <= $nb_answers; $i++) {
             $form->addHtml('<tr>');
             if (is_object($answer)) {
                 $defaults['answer['.$i.']'] = $answer->answer[$i];
@@ -187,7 +187,7 @@ class MultipleAnswer extends Question
         $objAnswer = new Answer($this->id);
         $nb_answers = $form->getSubmitValue('nb_answers');
 
-        for ($i = 1; $i <= $nb_answers; ++$i) {
+        for ($i = 1; $i <= $nb_answers; $i++) {
             $answer = trim(str_replace(['<p>', '</p>'], '', $form->getSubmitValue('answer['.$i.']')));
             $comment = trim(str_replace(['<p>', '</p>'], '', $form->getSubmitValue('comment['.$i.']')));
             $weighting = trim($form->getSubmitValue('weighting['.$i.']'));
diff --git a/public/main/exercise/multiple_answer_combination.class.php b/public/main/exercise/multiple_answer_combination.class.php
index fd78c1d2ef..e342802767 100644
--- a/public/main/exercise/multiple_answer_combination.class.php
+++ b/public/main/exercise/multiple_answer_combination.class.php
@@ -68,7 +68,7 @@ class MultipleAnswerCombination extends Question
             echo Display::return_message(get_lang('You have to create at least one answer'));
         }
 
-        for ($i = 1; $i <= $nb_answers; ++$i) {
+        for ($i = 1; $i <= $nb_answers; $i++) {
             $form->addHtml('<tr>');
 
             if (is_object($answer)) {
@@ -181,7 +181,7 @@ class MultipleAnswerCombination extends Question
         $objAnswer = new Answer($this->id);
         $nb_answers = $form->getSubmitValue('nb_answers');
 
-        for ($i = 1; $i <= $nb_answers; ++$i) {
+        for ($i = 1; $i <= $nb_answers; $i++) {
             $answer = trim($form->getSubmitValue('answer['.$i.']'));
             $comment = trim($form->getSubmitValue('comment['.$i.']'));
             if (1 == $i) {
diff --git a/public/main/exercise/multiple_answer_true_false.class.php b/public/main/exercise/multiple_answer_true_false.class.php
index 7731a42ec8..4003fe004b 100644
--- a/public/main/exercise/multiple_answer_true_false.class.php
+++ b/public/main/exercise/multiple_answer_true_false.class.php
@@ -79,7 +79,7 @@ class MultipleAnswerTrueFalse extends Question
         // Can be more options
         $optionData = Question::readQuestionOption($this->id, $course_id);
 
-        for ($i = 1; $i <= $nb_answers; ++$i) {
+        for ($i = 1; $i <= $nb_answers; $i++) {
             $form->addHtml('<tr>');
 
             $renderer->setElementTemplate(
@@ -118,7 +118,7 @@ class MultipleAnswerTrueFalse extends Question
                 if (!empty($optionData)) {
                     foreach ($optionData as $id => $data) {
                         $form->addElement('radio', 'correct['.$i.']', null, null, $id);
-                        ++$j;
+                        $j++;
                         if (3 == $j) {
                             break;
                         }
@@ -206,7 +206,7 @@ class MultipleAnswerTrueFalse extends Question
             $scores = explode(':', $this->extra);
 
             if (!empty($scores)) {
-                for ($i = 1; $i <= 3; ++$i) {
+                for ($i = 1; $i <= 3; $i++) {
                     $defaults['option['.$i.']'] = $scores[$i - 1];
                 }
             }
@@ -249,7 +249,7 @@ class MultipleAnswerTrueFalse extends Question
                 Question::updateQuestionOption($id, $optionData, $course_id);
             }
         } else {
-            for ($i = 1; $i <= 3; ++$i) {
+            for ($i = 1; $i <= 3; $i++) {
                 $last_id = Question::saveQuestionOption(
                     $this->id,
                     $this->options[$i],
@@ -272,13 +272,13 @@ class MultipleAnswerTrueFalse extends Question
         the true, false, doubt options registered in this format
         XX:YY:ZZZ where XX is a float score value.*/
         $extra_values = [];
-        for ($i = 1; $i <= 3; ++$i) {
+        for ($i = 1; $i <= 3; $i++) {
             $score = trim($form->getSubmitValue('option['.$i.']'));
             $extra_values[] = $score;
         }
         $this->setExtra(implode(':', $extra_values));
 
-        for ($i = 1; $i <= $nb_answers; ++$i) {
+        for ($i = 1; $i <= $nb_answers; $i++) {
             $answer = trim($form->getSubmitValue('answer['.$i.']'));
             $comment = trim($form->getSubmitValue('comment['.$i.']'));
             $goodAnswer = trim($form->getSubmitValue('correct['.$i.']'));
diff --git a/public/main/exercise/oral_expression.class.php b/public/main/exercise/oral_expression.class.php
index 5b428d28ae..320b3abfb3 100644
--- a/public/main/exercise/oral_expression.class.php
+++ b/public/main/exercise/oral_expression.class.php
@@ -72,10 +72,10 @@ class OralExpression extends Question
     /**
      * initialize the attributes to generate the file path.
      *
-     * @param integer $sessionId
-     * @param integer $userId
-     * @param integer $exerciseId
-     * @param integer $exeId
+     * @param int $sessionId
+     * @param int $userId
+     * @param int $exerciseId
+     * @param int $exeId
      */
     public function initFile($sessionId, $userId, $exerciseId, $exeId)
     {
@@ -204,7 +204,7 @@ class OralExpression extends Question
     /**
      * Tricky stuff to deal with the feedback = 0 in exercises (all question per page).
      *
-     * @param integer $exe_id
+     * @param int $exe_id
      */
     public function replaceWithRealExe($exe_id)
     {
diff --git a/public/main/exercise/overview.php b/public/main/exercise/overview.php
index 1010d1aadc..cf4cdb23f6 100644
--- a/public/main/exercise/overview.php
+++ b/public/main/exercise/overview.php
@@ -294,7 +294,7 @@ if (!empty($attempts)) {
             $row['attempt_link'] = $attempt_link;
         }
         $my_attempt_array[] = $row;
-        --$i;
+        $i--;
     }
 
     $header_names = [];
@@ -365,7 +365,7 @@ if (!empty($attempts)) {
     $column = 0;
     foreach ($header_names as $item) {
         $table->setHeaderContents(0, $column, $item);
-        ++$column;
+        $column++;
     }
     $row = 1;
     if (!empty($my_attempt_array)) {
@@ -373,8 +373,8 @@ if (!empty($attempts)) {
             $column = 0;
             $table->setCellContents($row, $column, $data);
             $table->setRowAttributes($row, null, true);
-            ++$column;
-            ++$row;
+            $column++;
+            $row++;
         }
     }
     $table_content = $table->toHtml();
diff --git a/public/main/exercise/qti2.php b/public/main/exercise/qti2.php
index 2ae493f2e7..7f462b05cb 100644
--- a/public/main/exercise/qti2.php
+++ b/public/main/exercise/qti2.php
@@ -5,7 +5,6 @@
 /**
  * Code for Qti2 import integration.
  *
- *
  * @author Ronny Velasquez
  *
  * @version $Id: qti2.php  2010-03-12 12:14:25Z $
diff --git a/public/main/exercise/question.class.php b/public/main/exercise/question.class.php
index 5d8e294b74..4d953187f4 100644
--- a/public/main/exercise/question.class.php
+++ b/public/main/exercise/question.class.php
@@ -864,7 +864,7 @@ abstract class Question
             $newExercise = new Exercise($courseId);
             $newExercise->read($exerciseId, false);
             $count = $newExercise->getQuestionCount();
-            ++$count;
+            $count++;
             $sql = "INSERT INTO $exerciseRelQuestionTable (c_id, question_id, exercice_id, question_order)
                     VALUES ({$this->course['real_id']}, ".$id.', '.$exerciseId.", '$count')";
             Database::query($sql);
diff --git a/public/main/exercise/question_list_admin.inc.php b/public/main/exercise/question_list_admin.inc.php
index 588fd4f8f4..7bacd4293f 100644
--- a/public/main/exercise/question_list_admin.inc.php
+++ b/public/main/exercise/question_list_admin.inc.php
@@ -25,7 +25,7 @@ if ($deleteQuestion) {
 
         // if the question has been removed from the exercise
         if ($objExercise->removeFromList($deleteQuestion)) {
-            --$nbrQuestions;
+            $nbrQuestions--;
         }
     }
     // destruction of the Question object
@@ -179,7 +179,7 @@ if (!$inATest) {
             $pagination->setCurrentPageNumber($page);
             $pagination->renderer = function ($data) use ($url) {
                 $render = '<ul class="pagination">';
-                for ($i = 1; $i <= $data['pageCount']; ++$i) {
+                for ($i = 1; $i <= $data['pageCount']; $i++) {
                     $pageContent = '<li><a href="'.$url.'&page='.$i.'">'.$i.'</a></li>';
                     if ($data['current'] == $i) {
                         $pageContent = '<li class="active"><a href="#" >'.$i.'</a></li>';
diff --git a/public/main/exercise/question_pool.php b/public/main/exercise/question_pool.php
index 43a8d73b60..2053fff992 100644
--- a/public/main/exercise/question_pool.php
+++ b/public/main/exercise/question_pool.php
@@ -794,7 +794,7 @@ $pagination->renderer = function ($data) use ($url) {
     $render = '';
     if ($data['pageCount'] > 1) {
         $render = '<ul class="pagination">';
-        for ($i = 1; $i <= $data['pageCount']; ++$i) {
+        for ($i = 1; $i <= $data['pageCount']; $i++) {
             $pageContent = '<li><a href="'.$url.'&page='.$i.'">'.$i.'</a></li>';
             if ($data['current'] == $i) {
                 $pageContent = '<li class="active"><a href="#" >'.$i.'</a></li>';
diff --git a/public/main/exercise/stats.php b/public/main/exercise/stats.php
index f3077e5462..0f49aeb2e6 100644
--- a/public/main/exercise/stats.php
+++ b/public/main/exercise/stats.php
@@ -100,18 +100,18 @@ $row = 0;
 $column = 0;
 foreach ($headers as $header) {
     $table->setHeaderContents($row, $column, $header);
-    ++$column;
+    $column++;
 }
-++$row;
+$row++;
 foreach ($data as $row_table) {
     $column = 0;
     foreach ($row_table as $cell) {
         $table->setCellContents($row, $column, $cell);
         $table->updateCellAttributes($row, $column, 'align="center"');
-        ++$column;
+        $column++;
     }
     $table->updateRowAttributes($row, $row % 2 ? 'class="row_even"' : 'class="row_odd"', true);
-    ++$row;
+    $row++;
 }
 $content = $table->toHtml();
 
@@ -139,7 +139,7 @@ if (!empty($question_list)) {
         $answer = new Answer($question_id);
         $answer_count = $answer->selectNbrAnswers();
 
-        for ($answer_id = 1; $answer_id <= $answer_count; ++$answer_id) {
+        for ($answer_id = 1; $answer_id <= $answer_count; $answer_id++) {
             $answer_info = $answer->selectAnswer($answer_id);
             $is_correct = $answer->isCorrect($answer_id);
             $correct_answer = 1 == $is_correct ? get_lang('Yes') : get_lang('No');
@@ -178,8 +178,8 @@ if (!empty($question_list)) {
                             false,
                             $count.' / '.$count_students
                         );
-                        ++$id;
-                        ++$counter;
+                        $id++;
+                        $counter++;
                     }
 
                     break;
@@ -192,7 +192,7 @@ if (!empty($question_list)) {
                             $data[$id]['name'] = '-';
                         }
                         $correct = '';
-                        for ($i = 1; $i <= $answer_count; ++$i) {
+                        for ($i = 1; $i <= $answer_count; $i++) {
                             $is_correct_i = $answer->isCorrect($i);
                             if (0 != $is_correct_i && $is_correct_i == $answer_id) {
                                 $correct = $answer->selectAnswer($i);
@@ -276,7 +276,7 @@ if (!empty($question_list)) {
                         $count.' / '.$count_students
                     );
             }
-            ++$id;
+            $id++;
         }
     }
 }
@@ -287,18 +287,18 @@ $row = 0;
 $column = 0;
 foreach ($headers as $header) {
     $table->setHeaderContents($row, $column, $header);
-    ++$column;
+    $column++;
 }
-++$row;
+$row++;
 foreach ($data as $row_table) {
     $column = 0;
     foreach ($row_table as $cell) {
         $table->setCellContents($row, $column, $cell);
         $table->updateCellAttributes($row, $column, 'align="center"');
-        ++$column;
+        $column++;
     }
     $table->updateRowAttributes($row, $row % 2 ? 'class="row_even"' : 'class="row_odd"', true);
-    ++$row;
+    $row++;
 }
 $content .= $table->toHtml();
 
diff --git a/public/main/exercise/unique_answer.class.php b/public/main/exercise/unique_answer.class.php
index 4c38f5cfe7..9ef25e0e7c 100644
--- a/public/main/exercise/unique_answer.class.php
+++ b/public/main/exercise/unique_answer.class.php
@@ -126,7 +126,7 @@ class UniqueAnswer extends Question
             );
         }
 
-        for ($i = 1; $i <= $nb_answers; ++$i) {
+        for ($i = 1; $i <= $nb_answers; $i++) {
             $form->addHtml('<tr>');
             if (isset($answer) && is_object($answer)) {
                 if (isset($answer->correct[$i]) && $answer->correct[$i]) {
@@ -337,7 +337,7 @@ class UniqueAnswer extends Question
         $objAnswer = new Answer($this->id);
         $nb_answers = $form->getSubmitValue('nb_answers');
 
-        for ($i = 1; $i <= $nb_answers; ++$i) {
+        for ($i = 1; $i <= $nb_answers; $i++) {
             $answer = trim($form->getSubmitValue('answer['.$i.']'));
             $comment = trim($form->getSubmitValue('comment['.$i.']'));
             $weighting = trim($form->getSubmitValue('weighting['.$i.']'));
diff --git a/public/main/exercise/unique_answer_no_option.class.php b/public/main/exercise/unique_answer_no_option.class.php
index 679555ef96..fb356479eb 100644
--- a/public/main/exercise/unique_answer_no_option.class.php
+++ b/public/main/exercise/unique_answer_no_option.class.php
@@ -98,17 +98,17 @@ class UniqueAnswerNoOption extends Question
             if (isset($_POST['lessAnswers'])) {
                 if (!isset($_SESSION['less_answer'])) {
                     $_SESSION['less_answer'] = $this->id;
-                    --$nb_answers;
+                    $nb_answers--;
                 }
             }
-            for ($k = 1; $k <= $nb_answers; ++$k) {
+            for ($k = 1; $k <= $nb_answers; $k++) {
                 if ('666' != $answer->position[$k]) {
                     $new_list[$count] = $count;
-                    ++$count;
+                    $count++;
                 }
             }
         } else {
-            for ($k = 1; $k <= $nb_answers; ++$k) {
+            for ($k = 1; $k <= $nb_answers; $k++) {
                 $new_list[$k] = $k;
             }
         }
@@ -192,7 +192,7 @@ class UniqueAnswerNoOption extends Question
             $form->addElement('html_editor', 'comment['.$i.']', null, [], $editor_config);
             $form->addElement('text', 'weighting['.$i.']', null, ['style' => 'width: 60px;', 'value' => '0']);
             $form->addElement('html', '</tr>');
-            ++$i;
+            $i++;
         }
 
         if (empty($this->id)) {
@@ -288,7 +288,7 @@ class UniqueAnswerNoOption extends Question
             $minus = 0;
         }
 
-        for ($i = 1; $i <= $nb_answers - $minus; ++$i) {
+        for ($i = 1; $i <= $nb_answers - $minus; $i++) {
             $answer = trim($form->getSubmitValue('answer['.$i.']'));
             $comment = trim($form->getSubmitValue('comment['.$i.']'));
             $weighting = trim($form->getSubmitValue('weighting['.$i.']'));
diff --git a/public/main/exercise/upload_exercise.php b/public/main/exercise/upload_exercise.php
index 8fdbca58a8..0e47fd7976 100644
--- a/public/main/exercise/upload_exercise.php
+++ b/public/main/exercise/upload_exercise.php
@@ -89,7 +89,7 @@ function lp_upload_quiz_main()
     foreach ($tableList as $key => $label) {
         $table->setCellContents($row, 0, $label);
         $table->setCellContents($row, 1, $key);
-        ++$row;
+        $row++;
     }
     $table = $table->toHtml();
 
@@ -159,7 +159,7 @@ function lp_upload_quiz_action_handling()
     $incorrectScore = isset($_POST['incorrect_score']) ? $_POST['incorrect_score'] : null;
     $useCustomScore = isset($_POST['user_custom_score']) ? true : false;
 
-    for ($row = 1; $row <= $highestRow; ++$row) {
+    for ($row = 1; $row <= $highestRow; $row++) {
         $cellTitleInfo = $worksheet->getCellByColumnAndRow(0, $row);
         $cellDataInfo = $worksheet->getCellByColumnAndRow(1, $row);
         $cellScoreInfo = $worksheet->getCellByColumnAndRow(2, $row);
@@ -177,7 +177,7 @@ function lp_upload_quiz_action_handling()
                 $continue = true;
                 $answerIndex = 0;
                 while ($continue) {
-                    ++$answerRow;
+                    $answerRow++;
                     $answerInfoTitle = $worksheet->getCellByColumnAndRow(0, $answerRow);
                     $answerInfoData = $worksheet->getCellByColumnAndRow(1, $answerRow);
                     $answerInfoExtra = $worksheet->getCellByColumnAndRow(2, $answerRow);
@@ -188,7 +188,7 @@ function lp_upload_quiz_action_handling()
                     } else {
                         $continue = false;
                     }
-                    ++$answerIndex;
+                    $answerIndex++;
 
                     // To avoid loops
                     if ($answerIndex > 60) {
@@ -201,7 +201,7 @@ function lp_upload_quiz_action_handling()
                 $continue = true;
                 $questionTypeIndex = 0;
                 while ($continue) {
-                    ++$answerRow;
+                    $answerRow++;
                     $questionTypeTitle = $worksheet->getCellByColumnAndRow(0, $answerRow);
                     $questionTypeExtra = $worksheet->getCellByColumnAndRow(2, $answerRow);
                     $title = $questionTypeTitle->getValue();
@@ -216,11 +216,11 @@ function lp_upload_quiz_action_handling()
                     if ($questionTypeIndex > 60) {
                         $continue = false;
                     }
-                    ++$questionTypeIndex;
+                    $questionTypeIndex++;
                 }
 
                 // Detect answers
-                ++$numberQuestions;
+                $numberQuestions++;
 
                 break;
             case 'Score':
@@ -280,7 +280,7 @@ function lp_upload_quiz_action_handling()
 
         if ($quiz_id) {
             // Import questions.
-            for ($i = 0; $i < $numberQuestions; ++$i) {
+            for ($i = 0; $i < $numberQuestions; $i++) {
                 // Question name
                 $questionTitle = $question[$i];
                 $myAnswerList = isset($answerList[$i]) ? $answerList[$i] : [];
@@ -373,7 +373,7 @@ function lp_upload_quiz_action_handling()
                             $numberRightAnswers = 0;
                             foreach ($myAnswerList as $answer_data) {
                                 if ('x' == strtolower($answer_data['extra'])) {
-                                    ++$numberRightAnswers;
+                                    $numberRightAnswers++;
                                 }
                             }
 
@@ -435,7 +435,7 @@ function lp_upload_quiz_action_handling()
                                 );
 
                                 $total += (float) $score;
-                                ++$id;
+                                $id++;
                             }
 
                             $objAnswer->save();
@@ -514,13 +514,13 @@ function lp_upload_quiz_action_handling()
                         foreach ($myAnswerList as $data) {
                             $option = isset($data['extra']) ? $data['extra'] : '';
                             $objAnswer->createAnswer($option, 0, '', 0, $position);
-                            ++$position;
+                            $position++;
                         }
 
                         $counter = 1;
                         foreach ($myAnswerList as $data) {
                             $value = isset($data['data']) ? $data['data'] : '';
-                            ++$position;
+                            $position++;
                             $objAnswer->createAnswer(
                                 $value,
                                 $counter,
@@ -528,7 +528,7 @@ function lp_upload_quiz_action_handling()
                                 $globalScore,
                                 $position
                             );
-                            ++$counter;
+                            $counter++;
                         }
                         $objAnswer->save();
                         $questionObj = Question::read($question_id, $_course);
@@ -596,7 +596,7 @@ function detectQuestionType($answers_data)
 
     foreach ($answers_data as $answer_data) {
         if ('x' == strtolower($answer_data['extra'])) {
-            ++$correct;
+            $correct++;
         } else {
             if (is_numeric($answer_data['extra'])) {
                 $isNumeric = true;
diff --git a/public/main/extra/create_school_calendar.php b/public/main/extra/create_school_calendar.php
index 50f1fa41cb..ccc2ae652d 100644
--- a/public/main/extra/create_school_calendar.php
+++ b/public/main/extra/create_school_calendar.php
@@ -57,7 +57,7 @@ if (empty($title)) {
         $nbcol = 2;
 
         echo "<table border='1'><tr>";
-        if ($i % $nbcol == 0) {
+        if (0 == $i % $nbcol) {
             for ($i = 0; $i <= $nbjour; $i++) {
                 echo "<td><input type='text' NAME='date_case' size='8' value=".date('Y-m-d', $date1)."> ";
                 $date1 += 60 * 60 * 24; //On additionne d'un jour (en seconde)
diff --git a/public/main/extra/group_space_tracking.php b/public/main/extra/group_space_tracking.php
index 165aa63e1c..6bd65d58b7 100644
--- a/public/main/extra/group_space_tracking.php
+++ b/public/main/extra/group_space_tracking.php
@@ -38,19 +38,19 @@ $forums_of_groups = get_forums_of_group($current_group['id']);
 $forum_state_public = 0;
 if (is_array($forums_of_groups)) {
     foreach ($forums_of_groups as $key => $value) {
-        if ($value['forum_group_public_private'] == 'public') {
+        if ('public' == $value['forum_group_public_private']) {
             $forum_state_public = 1;
         }
     }
 }
 
-if ($current_group['doc_state'] != 1 &&
-    $current_group['calendar_state'] != 1 &&
-    $current_group['work_state'] != 1 &&
-    $current_group['announcements_state'] != 1 &&
-    $current_group['wiki_state'] != 1 &&
-    $current_group['chat_state'] != 1 &&
-    $forum_state_public != 1
+if (1 != $current_group['doc_state'] &&
+    1 != $current_group['calendar_state'] &&
+    1 != $current_group['work_state'] &&
+    1 != $current_group['announcements_state'] &&
+    1 != $current_group['wiki_state'] &&
+    1 != $current_group['chat_state'] &&
+    1 != $forum_state_public
 ) {
     if (!api_is_allowed_to_edit(null, true) &&
         !GroupManager::is_user_in_group($user_id, $group_id)) {
@@ -74,7 +74,7 @@ $is_course_member = CourseManager::is_user_subscribed_in_real_or_linked_course(
 $tutors = GroupManager::get_subscribed_tutors($current_group['id']);
 
 $tutor_info = '';
-if (count($tutors) == 0) {
+if (0 == count($tutors)) {
     $tutor_info = get_lang('(none)');
 } else {
     isset($origin) ? $my_origin = $origin : $my_origin = '';
@@ -331,7 +331,7 @@ while ($resulta = Database::fetch_array($result)) {
     //si rien n'est inscrit cette journée dans l'agenda, recule de -1
     unset($jour_agenda);
     $tour = -1;
-    while ($jour_agenda == '') {
+    while ('' == $jour_agenda) {
         $tour++;
         $date = date("Y-m-d", mktime(0, 0, 0, date("m"), date("d") - $tour, date("Y")));
         $sql4 = "SELECT *  FROM $tbl_personal_agenda
@@ -367,7 +367,7 @@ while ($resulta = Database::fetch_array($result)) {
 
     $diff = abs($diff);
     $last_connection_date = Tracking:: get_last_connection_date($user_in_groupe, true);
-    if ($last_connection_date == '') {
+    if ('' == $last_connection_date) {
         $last_connection_date = get_lang('No connection');
     }
     // on présente tous les résultats
@@ -421,6 +421,6 @@ function user_name_filter($name, $url_params, $row)
 
 // Footer
 $orig = isset($origin) ? $origin : '';
-if ($orig != 'learnpath') {
+if ('learnpath' != $orig) {
     Display::display_footer();
 }
diff --git a/public/main/extra/myStudents.php b/public/main/extra/myStudents.php
index bf564107f5..b777e2867d 100644
--- a/public/main/extra/myStudents.php
+++ b/public/main/extra/myStudents.php
@@ -9,7 +9,7 @@ if (empty($allow)) {
 }
 
 api_block_anonymous_users();
-$export_csv = isset($_GET['export']) && $_GET['export'] === 'csv' ? true : false;
+$export_csv = isset($_GET['export']) && 'csv' === $_GET['export'] ? true : false;
 $course_code = isset($_GET['course']) ? Security::remove_XSS($_GET['course']) : null;
 $_course = api_get_course_info();
 $coment = '';
@@ -29,7 +29,7 @@ if (!api_is_allowed_to_create_course() &&
     // Francois Belisle Kezber...
     // If user is NOT a teacher -> student, but IS the teacher of the course... Won't have the global teacher status
     // and won't be tutor... So have to check is_course_teacher
-    if (($user_course_status != 1) && !(CourseManager::is_course_teacher(api_get_user_id(), $course_code))) {
+    if ((1 != $user_course_status) && !(CourseManager::is_course_teacher(api_get_user_id(), $course_code))) {
         api_not_allowed(true);
     }
 }
@@ -57,7 +57,7 @@ if ($export) {
 $csv_content = [];
 $from_myspace = false;
 
-if (isset($_GET['from']) && $_GET['from'] == 'myspace') {
+if (isset($_GET['from']) && 'myspace' == $_GET['from']) {
     $from_myspace = true;
     $this_section = SECTION_TRACKING;
 } else {
@@ -68,7 +68,7 @@ $nameTools = get_lang('Learner details');
 $em = Database::getManager();
 
 if (isset($_GET['details'])) {
-    if ($origin === 'user_course') {
+    if ('user_course' === $origin) {
         if (empty($cidReq)) {
             $interbreadcrumb[] = [
                 "url" => api_get_path(WEB_COURSE_PATH).$courseInfo['directory'],
@@ -80,13 +80,13 @@ if (isset($_GET['details'])) {
             "name" => get_lang('Users'),
         ];
     } else {
-        if ($origin === 'tracking_course') {
+        if ('tracking_course' === $origin) {
             $interbreadcrumb[] = [
                 "url" => "../tracking/courseLog.php?cidReq=".$course_code.'&id_session='.api_get_session_id(),
                 "name" => get_lang('Reporting'),
             ];
         } else {
-            if ($origin === 'resume_session') {
+            if ('resume_session' === $origin) {
                 $interbreadcrumb[] = [
                     'url' => "../session/session_list.php",
                     "name" => get_lang('Session list'),
@@ -124,7 +124,7 @@ if (isset($_GET['details'])) {
     }
     $nameTools = get_lang("Learner details in course");
 } else {
-    if ($origin == 'resume_session') {
+    if ('resume_session' == $origin) {
         $interbreadcrumb[] = [
             'url' => "../session/session_list.php",
             "name" => get_lang('Session list'),
@@ -188,7 +188,7 @@ $course_quiz_answer = 'quiz_answer';
 $course_student_publication = Database::get_course_table(TABLE_STUDENT_PUBLICATION);
 $TABLECALHORAIRE = Database:: get_course_table(TABLE_CAL_HORAIRE);
 
-if (isset($_GET['user_id']) && $_GET['user_id'] != '') {
+if (isset($_GET['user_id']) && '' != $_GET['user_id']) {
     $user_id = intval($_GET['user_id']);
 } else {
     $user_id = api_get_user_id();
@@ -422,12 +422,12 @@ if (!empty($studentId)) {
 
     // get information about connections on the platform by student
     $first_connection_date = Tracking:: get_first_connection_date($user_info['user_id']);
-    if ($first_connection_date == '') {
+    if ('' == $first_connection_date) {
         $first_connection_date = get_lang('No connection');
     }
 
     $last_connection_date = Tracking:: get_last_connection_date($user_info['user_id'], true);
-    if ($last_connection_date == '') {
+    if ('' == $last_connection_date) {
         $last_connection_date = get_lang('No connection');
     }
 
@@ -530,10 +530,10 @@ if (!empty($studentId)) {
                 $timezone = null;
     $timezone_user = UserManager::get_extra_user_data_by_field($user_info['user_id'], 'timezone');
     $use_users_timezone = api_get_setting('use_users_timezone', 'timezones');
-    if ($timezone_user['timezone'] != null && $use_users_timezone == 'true') {
+    if (null != $timezone_user['timezone'] && 'true' == $use_users_timezone) {
         $timezone = $timezone_user['timezone'];
     }
-    if ($timezone !== null) {
+    if (null !== $timezone) {
         ?>
                     <tr>
                         <td> <?php echo get_lang('Timezone').' : '.$timezone; ?> </td>
@@ -559,7 +559,7 @@ if (!empty($studentId)) {
                     <td align="right"><?php echo get_lang('Latest login in platform'); ?></td>
                     <td align="left"><?php echo $last_connection_date; ?></td>
                 </tr>
-                <?php if (isset($_GET['details']) && $_GET['details'] == 'true') {
+                <?php if (isset($_GET['details']) && 'true' == $_GET['details']) {
         ?>
                     <tr>
                         <td align="right"><?php echo get_lang('Time spent in the course'); ?></td>
@@ -598,7 +598,7 @@ if (!empty($studentId)) {
                     <?php
     }
 
-    if (api_get_setting('allow_terms_conditions') === 'true') {
+    if ('true' === api_get_setting('allow_terms_conditions')) {
         $isBoss = UserManager::userIsBossOfStudent(api_get_user_id(), $studentId);
         if ($isBoss || api_is_platform_admin()) {
             $extraFieldValue = new ExtraFieldValue('user');
@@ -818,7 +818,7 @@ if (!empty($studentId)) {
             echo '</div>';
         }
     } else {
-        if ($user_info['status'] != INVITEE) {
+        if (INVITEE != $user_info['status']) {
             $csv_content[] = [];
             $csv_content[] = [str_replace('&nbsp;', '', $table_title)];
             $t_lp = Database:: get_course_table(TABLE_LP_MAIN);
@@ -935,7 +935,7 @@ if (!empty($studentId)) {
                                 $sessionId
                             );
 
-                    if ($progress === null) {
+                    if (null === $progress) {
                         $progress = '0%';
                     } else {
                         $any_result = true;
@@ -989,7 +989,7 @@ if (!empty($studentId)) {
                                 true
                             );
 
-                    if ($i % 2 == 0) {
+                    if (0 == $i % 2) {
                         $css_class = "row_even";
                     } else {
                         $css_class = "row_odd";
@@ -1036,7 +1036,7 @@ if (!empty($studentId)) {
                     // which implies several other changes not a priority right now
                     echo Display::tag('td', $start_time);
 
-                    if ($any_result === true) {
+                    if (true === $any_result) {
                         $from = '';
                         if ($from_myspace) {
                             $from = '&from=myspace';
@@ -1051,7 +1051,7 @@ if (!empty($studentId)) {
 
                     if (api_is_allowed_to_edit()) {
                         echo '<td>';
-                        if ($any_result === true) {
+                        if (true === $any_result) {
                             echo '<a href="myStudents.php?action=reset_lp&sec_token='.$token.
                                 '&cidReq='.$course_code.
                                 '&course='.$course_code.
@@ -1081,7 +1081,7 @@ if (!empty($studentId)) {
             }
         } ?>
         <!-- line about exercises -->
-        <?php if ($user_info['status'] != INVITEE) {
+        <?php if (INVITEE != $user_info['status']) {
             ?>
             <div class="table-responsive">
                 <table class="table table-striped table-hover">
@@ -1413,7 +1413,7 @@ $resulta = Database::fetch_array($res);
 
 $num_hours = $resulta['num_hours'];
 $num_minute = $resulta['num_minute'];
-if ($num_minute == '0') {
+if ('0' == $num_minute) {
     $num_minute = '1';
 }
 $minute_mod = $num_hours * 60;
@@ -1500,7 +1500,7 @@ while ($jtot = Database::fetch_array($resultjt)) {
 //recherche du jour inséré dans agenda par le calendrier
 $jour_agenda = '';
 $tour = -1;
-while ($jour_agenda == '') {
+while ('' == $jour_agenda) {
     $tour++;
     $date = date("Y-m-d", mktime(0, 0, 0, date("m"), date("d") - $tour, date("Y")));
     $sql4 = "SELECT *  FROM $tbl_personal_agenda
@@ -1767,12 +1767,12 @@ if (empty($_GET['details'])) {
         }
         $date_start = '';
 
-        if (!empty($session_info['date_start']) && $session_info['date_start'] != '0000-00-00') {
+        if (!empty($session_info['date_start']) && '0000-00-00' != $session_info['date_start']) {
             $date_start = api_format_date($session_info['date_start'], DATE_FORMAT_SHORT);
         }
 
         $date_end = '';
-        if (!empty($session_info['date_end']) && $session_info['date_end'] != '0000-00-00') {
+        if (!empty($session_info['date_end']) && '0000-00-00' != $session_info['date_end']) {
             $date_end = api_format_date($session_info['date_end'], DATE_FORMAT_SHORT);
         }
         if (!empty($date_start) && !empty($date_end)) {
@@ -1930,7 +1930,7 @@ if (empty($_GET['details'])) {
                     $warming = '';
                     $today = date('Y-m-d');
 
-                    if ($end_date_module <= $today and $progress != '100%') {
+                    if ($end_date_module <= $today and '100%' != $progress) {
                         $warming = '<b><font color=#CC0000>  '.get_lang('limite_atteinte').'</font></b>';
                     }
 
@@ -2063,7 +2063,7 @@ if (empty($_GET['details'])) {
                 $session_id
             );
 
-            if ($progress === null) {
+            if (null === $progress) {
                 $progress = '0%';
             } else {
                 $any_result = true;
@@ -2117,7 +2117,7 @@ if (empty($_GET['details'])) {
                 true
             );
 
-            if ($i % 2 == 0) {
+            if (0 == $i % 2) {
                 $css_class = "row_even";
             } else {
                 $css_class = "row_odd";
@@ -2165,7 +2165,7 @@ if (empty($_GET['details'])) {
             //which implies several other changes not a priority right now
             echo Display::tag('td', $start_time);
 
-            if ($any_result === true) {
+            if (true === $any_result) {
                 $from = '';
                 if ($from_myspace) {
                     $from = '&from=myspace';
@@ -2183,7 +2183,7 @@ if (empty($_GET['details'])) {
 
             if (api_is_allowed_to_edit()) {
                 echo '<td>';
-                if ($any_result === true) {
+                if (true === $any_result) {
                     echo '<a href="myStudents.php?action=reset_lp&sec_token='.$token.'&cidReq='.Security::remove_XSS(
                             $_GET['course']
                         ).'&course='.Security::remove_XSS($_GET['course']).'&details='.Security::remove_XSS(
diff --git a/public/main/extra/my_progress_ind.php b/public/main/extra/my_progress_ind.php
index 863c1adccb..568ab8c53c 100644
--- a/public/main/extra/my_progress_ind.php
+++ b/public/main/extra/my_progress_ind.php
@@ -113,7 +113,7 @@ while ($a_courses = Database::fetch_array($result2)) {
                                 ";
                 $res4 = Database::query($Req4);
                 while ($resultat = Database::fetch_array($res4)) {
-                    if ($resultat[0] == null) {
+                    if (null == $resultat[0]) {
                         $resultat[0] = 0;
                     }
                     $Total = $Total + $resultat[0];
@@ -146,7 +146,7 @@ while ($jtot = Database::fetch_array($resultjt)) {
 //si rien n'est inscrit cette journée dans l'agenda, recule de -1
 $jour_agenda = '';
 $tour = -1;
-while ($jour_agenda == '') {
+while ('' == $jour_agenda) {
     $tour++;
     $date = date("Y-m-d", mktime(0, 0, 0, date("m"), date("d") - $tour, date("Y")));
     $sql4 = "SELECT title  FROM $tbl_personal_agenda
@@ -276,7 +276,7 @@ $diff = abs($diff);
                     <td>$inter_coment</td>";
             $exe_id = $a_inter['exe_id'];
         }
-        if ($level == 3) {
+        if (3 == $level) {
             echo '<span style="color: red; font-weight: bold;"><img src="../img/anim/pointeranim.gif"align="middle"  > ';
             echo $limit;
             echo '</span>';
@@ -405,7 +405,7 @@ while ($a_courses = Database::fetch_array($result2)) {
             [$lp_id],
             $session_id
         );
-        if ($progress === null) {
+        if (null === $progress) {
             $progress = '0%';
         } else {
             $any_result = true;
@@ -424,7 +424,7 @@ while ($a_courses = Database::fetch_array($result2)) {
             $any_result = true;
         }
 
-        if ($i % 2 == 0) {
+        if (0 == $i % 2) {
             $css_class = "row_even";
         } else {
             $css_class = "row_odd";
@@ -442,7 +442,7 @@ while ($a_courses = Database::fetch_array($result2)) {
     }
     $warming = '';
     $today = date('Y-m-d');
-    if (isset($end_date_module) && $end_date_module <= $today and $progress != '100%') {
+    if (isset($end_date_module) && $end_date_module <= $today and '100%' != $progress) {
         $warming = '<b><font color=#CC0000>  '.get_lang('limite_atteinte').'</font></b>';
     }
     $end_date_module = $end_date_module.$warming;
diff --git a/public/main/extra/print_myStudents.php b/public/main/extra/print_myStudents.php
index 4d7256ed45..3aac08d25b 100644
--- a/public/main/extra/print_myStudents.php
+++ b/public/main/extra/print_myStudents.php
@@ -9,7 +9,7 @@ if (empty($allow)) {
 }
 
 $from_myspace = false;
-if (isset($_GET['from']) && $_GET['from'] == 'myspace') {
+if (isset($_GET['from']) && 'myspace' == $_GET['from']) {
     $from_myspace = true;
     $this_section = SECTION_TRACKING;
 } else {
@@ -20,7 +20,7 @@ if (isset($_GET['from']) && $_GET['from'] == 'myspace') {
 $cidReset = true;
 $get_course_code = Security:: remove_XSS($_GET['course']);
 if (isset($_GET['details'])) {
-    if (!empty($_GET['origin']) && $_GET['origin'] == 'user_course') {
+    if (!empty($_GET['origin']) && 'user_course' == $_GET['origin']) {
         $course_info = CourseManager:: get_course_information($get_course_code);
         if (empty($cidReq)) {
             $interbreadcrumb[] = [
@@ -33,7 +33,7 @@ if (isset($_GET['details'])) {
             "name" => get_lang("Users"),
         ];
     } else {
-        if (!empty($_GET['origin']) && $_GET['origin'] == 'tracking_course') {
+        if (!empty($_GET['origin']) && 'tracking_course' == $_GET['origin']) {
             $course_info = CourseManager:: get_course_information($get_course_code);
             if (empty($cidReq)) {
                 //$interbreadcrumb[] = array ("url" => api_get_path(WEB_COURSE_PATH).$course_info['directory'], 'name' => $course_info['title']);
@@ -43,7 +43,7 @@ if (isset($_GET['details'])) {
                 "name" => get_lang("Reporting"),
             ];
         } else {
-            if (!empty($_GET['origin']) && $_GET['origin'] == 'resume_session') {
+            if (!empty($_GET['origin']) && 'resume_session' == $_GET['origin']) {
                 $interbreadcrumb[] = [
                     'url' => '../admin/index.php',
                     "name" => get_lang('Administration'),
@@ -61,7 +61,7 @@ if (isset($_GET['details'])) {
                     "url" => "index.php",
                     "name" => get_lang('Reporting'),
                 ];
-                if (isset($_GET['id_coach']) && intval($_GET['id_coach']) != 0) {
+                if (isset($_GET['id_coach']) && 0 != intval($_GET['id_coach'])) {
                     $interbreadcrumb[] = [
                         "url" => "student.php?id_coach=".Security:: remove_XSS($_GET['id_coach']),
                         "name" => get_lang("Learners of trainer"),
@@ -87,7 +87,7 @@ if (isset($_GET['details'])) {
     }
     $nameTools = get_lang("Learner details in course");
 } else {
-    if (!empty($_GET['origin']) && $_GET['origin'] == 'resume_session') {
+    if (!empty($_GET['origin']) && 'resume_session' == $_GET['origin']) {
         $interbreadcrumb[] = [
             'url' => '../admin/index.php',
             "name" => get_lang('Administration'),
@@ -105,8 +105,8 @@ if (isset($_GET['details'])) {
             "url" => "index.php",
             "name" => get_lang('Reporting'),
         ];
-        if (isset($_GET['id_coach']) && intval($_GET['id_coach']) != 0) {
-            if (isset($_GET['id_session']) && intval($_GET['id_session']) != 0) {
+        if (isset($_GET['id_coach']) && 0 != intval($_GET['id_coach'])) {
+            if (isset($_GET['id_session']) && 0 != intval($_GET['id_session'])) {
                 $interbreadcrumb[] = [
                     "url" => "student.php?id_coach=".Security:: remove_XSS(
                             $_GET['id_coach']
@@ -131,14 +131,14 @@ if (isset($_GET['details'])) {
 api_block_anonymous_users();
 
 if (!api_is_allowed_to_edit() && !api_is_coach() && !api_is_drh() && !api_is_course_tutor(
-    ) && $_user['status'] != SESSIONADMIN && !api_is_platform_admin(true)) {
+    ) && SESSIONADMIN != $_user['status'] && !api_is_platform_admin(true)) {
     api_not_allowed(true);
 }
 
 Display:: display_header($nameTools);
 $tbl_stats_exercices = Database:: get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
 
-if (isset($_GET['user_id']) && $_GET['user_id'] != '') {
+if (isset($_GET['user_id']) && '' != $_GET['user_id']) {
     $user_id = intval($_GET['user_id']);
 } else {
     $user_id = $_user['user_id'];
diff --git a/public/main/extra/save_school_calendar.php b/public/main/extra/save_school_calendar.php
index 51a13c6d8c..c2259164aa 100644
--- a/public/main/extra/save_school_calendar.php
+++ b/public/main/extra/save_school_calendar.php
@@ -29,7 +29,7 @@ foreach ($_POST as $index => $valeur) {
 
     echo "<table border='1'><tr>";
 
-    if ($i % $nbcol == 0) {
+    if (0 == $i % $nbcol) {
         $sqlexam = "SELECT * FROM set_module
                     WHERE cal_name =  '$d_title'";
     }
diff --git a/public/main/extra/userInfo.php b/public/main/extra/userInfo.php
index 7a792812b7..213d93d393 100644
--- a/public/main/extra/userInfo.php
+++ b/public/main/extra/userInfo.php
@@ -34,11 +34,11 @@ if (api_is_anonymous()) {
 $TBL_USERINFO_DEF = Database:: get_course_table(TABLE_USER_INFO_DEF);
 $TBL_USERINFO_CONTENT = Database:: get_course_table(TABLE_USER_INFO_CONTENT);
 
-if ($tool_info['visibility'] == 1) {
+if (1 == $tool_info['visibility']) {
     $interbreadcrumb[] = ['url' => 'user.php', 'name' => get_lang('Users')];
 }
 
-if ($origin != 'learnpath') { //so we are not in learnpath tool
+if ('learnpath' != $origin) { //so we are not in learnpath tool
     Display :: display_header($nameTools, "User");
     $origin = Security::remove_XSS($_GET['origin']);
 } else {
@@ -138,7 +138,7 @@ if ($allowedToEditContent) {
 }
 if (api_is_allowed_to_edit(null, true)) {
     echo '<div class="actions">';
-    if ($origin == 'users') {
+    if ('users' == $origin) {
         echo '<a href="user.php?'.api_get_cidreq().'&origin='.$origin.'">'.
             Display::return_icon('back.png', get_lang('Back to users list'), '', ICON_SIZE_MEDIUM).'</a>';
     } else {
@@ -147,7 +147,7 @@ if (api_is_allowed_to_edit(null, true)) {
     }
 
     if (!is_numeric($_GET['editMainUserInfo'])) {
-        if (api_get_setting('allow_user_course_subscription_by_course_admin') == 'true') {
+        if ('true' == api_get_setting('allow_user_course_subscription_by_course_admin')) {
             echo '<a href="userInfo.php?'.api_get_cidreq(
                 ).'&origin='.$origin.'&editMainUserInfo='.$userIdViewed.'">'.
                 Display::return_icon('edit.png', get_lang('Edit this user'), '', ICON_SIZE_MEDIUM).get_lang(
@@ -155,7 +155,7 @@ if (api_is_allowed_to_edit(null, true)) {
                 ).'</a>';
         }
     } else {
-        if (api_get_setting('allow_user_course_subscription_by_course_admin') == 'true') {
+        if ('true' == api_get_setting('allow_user_course_subscription_by_course_admin')) {
             echo '<a href="userInfo.php?'.api_get_cidreq().'&origin='.$origin.'&uInfo='.$userIdViewed.'">'.
                 Display::return_icon(
                     'user.png',
@@ -168,9 +168,9 @@ if (api_is_allowed_to_edit(null, true)) {
     echo '<a href="../mySpace/myStudents.php?'.api_get_cidreq().'&origin=user_course&student='.$userIdViewed.'&details=true&course='.$_course['id'].'">'.Display::return_icon('statistics.png', get_lang('Reporting for this user'), '', ICON_SIZE_MEDIUM).get_lang('Reporting for this user').'</a>';
     echo '</div>';
 } else {
-    if ($tool_info['visibility'] == 1) {
+    if (1 == $tool_info['visibility']) {
         echo '<div class="actions">';
-        if ($origin == 'users') {
+        if ('users' == $origin) {
             echo '<a href="user.php?'.api_get_cidreq().'&origin='.$origin.'">'.
                 Display::return_icon(
                     'back.png',
@@ -198,7 +198,7 @@ $is_session_course_coach = UserManager::is_session_course_coach(
     $current_session_id
 );
 
-if ($displayMode == "viewDefEdit") {
+if ("viewDefEdit" == $displayMode) {
     /* CATEGORIES DEFINITIONS : EDIT */
     $catToEdit = get_cat_def($_GET['editDef']);
     $edit_heading_form = new FormValidator('edit_heading_form');
@@ -214,7 +214,7 @@ if ($displayMode == "viewDefEdit") {
     $edit_heading_form->addElement('submit', 'submitDef', get_lang('Validate'));
     $edit_heading_form->setDefaults($catToEdit);
     $edit_heading_form->display();
-} elseif ($displayMode == "viewDefList") {
+} elseif ("viewDefList" == $displayMode) {
     $catList = get_cat_def_list();
     if ($catList) {
         foreach ($catList as $thisCat) {
@@ -236,7 +236,7 @@ if ($displayMode == "viewDefEdit") {
         "<input type=\"submit\" name=\"addDef\" class=\"plus\" value=\"".get_lang('Add new heading')."\" />",
     "</form>\n",
     "<center>\n";
-} elseif ($displayMode == 'viewContentEdit') {
+} elseif ('viewContentEdit' == $displayMode) {
     /* CATEGORIES CONTENTS : EDIT */
     $catToEdit = get_cat_content($userIdViewed, $_GET['editContent']);
     $content_heading_form = new FormValidator('content_heading_form');
@@ -244,7 +244,7 @@ if ($displayMode == "viewDefEdit") {
     $content_heading_form->addElement('hidden', 'catId');
     $content_heading_form->addElement('hidden', 'uInfo');
     $content_heading_form->addElement('static', null, $catToEdit['title'], htmlize($catToEdit['comment']));
-    if ($catToEdit['nbline'] == 1) {
+    if (1 == $catToEdit['nbline']) {
         $content_heading_form->addElement('text', 'content', null, ['size' => 80]);
     } else {
         $content_heading_form->addElement(
@@ -260,10 +260,10 @@ if ($displayMode == "viewDefEdit") {
     $defaults['uInfo'] = $userIdViewed;
     $content_heading_form->setDefaults($defaults);
     $content_heading_form->display();
-} elseif ($displayMode == "viewMainInfoEdit") {
+} elseif ("viewMainInfoEdit" == $displayMode) {
     $mainUserInfo = api_get_user_info($userIdViewed);
     if ($mainUserInfo) {
-        ($mainUserInfo['status'] == COURSEMANAGER) ? $courseAdminChecked = "checked" : $courseAdminChecked = "";
+        (COURSEMANAGER == $mainUserInfo['status']) ? $courseAdminChecked = "checked" : $courseAdminChecked = "";
         $image_array = UserManager::get_user_picture_path_by_id($userIdViewed, 'web', false, true);
         // get the path,width and height from original picture
         $big_image = $image_array['dir'].'big_'.$image_array['file'];
@@ -272,7 +272,7 @@ if ($displayMode == "viewDefEdit") {
         $big_image_height = $big_image_size['height'];
         $url_big_image = $big_image.'?rnd='.time();
 
-        if ($image_array['file'] == 'unknown.jpg') {
+        if ('unknown.jpg' == $image_array['file']) {
             echo '<img src="'.$image_array['dir'].$image_array['file'].'" border="1">';
         } else {
             echo '<input type="image" src="'.$image_array['dir'].$image_array['file'].'" onclick="return show_image(\''.$url_big_image.'\',\''.$big_image_width.'\',\''.$big_image_height.'\');"/>';
@@ -309,11 +309,11 @@ if ($displayMode == "viewDefEdit") {
             echo "<td>", get_lang('Teacher'), "</td>\n";
         }
         echo "<td><button class=\"save\" type=\"submit\" name=\"submit\">".get_lang('Save changes')."</button></td>\n", "</tr>", "</table>", "</form>\n";
-        if (api_get_setting('show_email_addresses') == 'true') {
+        if ('true' == api_get_setting('show_email_addresses')) {
             echo "<p>".Display:: encrypted_mailto_link($mainUserInfo['email'], $mainUserInfo['email'])."</p>";
         }
 
-        if (api_get_setting('extended_profile') == 'true') {
+        if ('true' == api_get_setting('extended_profile')) {
             if (!empty($mainUserInfo['competences'])) {
                 echo '<div style="margin-top:10px;" class="actions-message"><strong>'.get_lang('My competences').'</strong></div><div>'.$mainUserInfo['competences'].'</div>';
             }
@@ -333,7 +333,7 @@ if ($displayMode == "viewDefEdit") {
     } else {
         echo Display::return_message(get_lang('This learner is subscribed in this training through a training session. You cannot edit his information'));
     }
-} elseif ($displayMode == "viewContentList") {
+} elseif ("viewContentList" == $displayMode) {
     // default display
     $virtual_course_code = $_GET["virtual_course"];
     if (isset($virtual_course_code)) {
@@ -350,7 +350,7 @@ if ($displayMode == "viewDefEdit") {
         $big_image_height = $big_image_size['height'];
         $url_big_image = $big_image.'?rnd='.time();
 
-        if ($image_array['file'] == 'unknown.jpg') {
+        if ('unknown.jpg' == $image_array['file']) {
             echo '<img src="'.$image_array['dir'].$image_array['file'].'" border="1">';
         } else {
             echo '<input type="image" src="'.$image_array['dir'].$image_array['file'].'" onclick="return show_image(\''.$url_big_image.'\',\''.$big_image_width.'\',\''.$big_image_height.'\');"/>';
@@ -363,7 +363,7 @@ if ($displayMode == "viewDefEdit") {
         }
 
         // DISPLAY TABLE HEADING
-        if ($origin == 'learnpath') {
+        if ('learnpath' == $origin) {
             $allowedToEditDef = false;
             $is_allowedToTrack = false;
         }
@@ -380,11 +380,11 @@ if ($displayMode == "viewDefEdit") {
         "<td align=\"left\"><b>", $mainUserInfo['official_code'], "</td>";
         // DISPLAY TABLE CONTENT
         if ($current_session_id) {
-            if ($user_info_viewed['status'] == COURSEMANAGER) {
+            if (COURSEMANAGER == $user_info_viewed['status']) {
                 echo "<td> - </td>\n";
             }
         } else {
-            if ($user_info_viewed['status'] == STUDENT) {
+            if (STUDENT == $user_info_viewed['status']) {
                 echo "<td> - </td>\n";
             } else {
                 echo "<td> - </td>\n";
@@ -392,11 +392,11 @@ if ($displayMode == "viewDefEdit") {
         }
 
         echo "</tr></table>";
-        if (api_get_setting("show_email_addresses") == "true") {
+        if ("true" == api_get_setting("show_email_addresses")) {
             echo "<p>".Display::encrypted_mailto_link($mainUserInfo['email'], $mainUserInfo['email'])."</p>";
         }
 
-        if (api_get_setting('extended_profile') == 'true') {
+        if ('true' == api_get_setting('extended_profile')) {
             if (!empty($mainUserInfo['competences'])) {
                 echo '<div style="margin-top:10px;" class="actions-message"><strong>'.get_lang('My competences').'</strong></div><div>'.$mainUserInfo['competences'].'</div>';
             }
@@ -417,7 +417,7 @@ if ($displayMode == "viewDefEdit") {
         Display::return_message(get_lang('This learner is subscribed in this training through a training session. You cannot edit his information'), 'normal');
     }
 
-    if (api_get_setting('allow_user_headings') == 'true' && $allowedToEditDef) {
+    if ('true' == api_get_setting('allow_user_headings') && $allowedToEditDef) {
         // only course administrators see this line
         echo "<div align=right>",
             "<form method=\"post\" action=\"".api_get_self()."\">",
diff --git a/public/main/extra/userInfoLib.php b/public/main/extra/userInfoLib.php
index 00829baf5e..f161cd3a6e 100644
--- a/public/main/extra/userInfoLib.php
+++ b/public/main/extra/userInfoLib.php
@@ -102,7 +102,7 @@ function remove_cat_def($id, $force = false)
 
     $id = strval(intval($id));
 
-    if ((0 == (int) $id || $id == "ALL") || !is_bool($force)) {
+    if ((0 == (int) $id || "ALL" == $id) || !is_bool($force)) {
         return false;
     }
     $sqlCondition = " WHERE id = $id";
@@ -136,7 +136,7 @@ function move_cat_rank($id, $direction) // up & down.
     $TBL_USERINFO_DEF = Database:: get_course_table(userinfo_def);
     $id = strval(intval($id));
 
-    if (0 == (int) $id || !($direction == "up" || $direction == "down")) {
+    if (0 == (int) $id || !("up" == $direction || "down" == $direction)) {
         return false;
     }
 
@@ -170,11 +170,11 @@ function move_cat_rank_by_rank($rank, $direction) // up & down.
 {
     $TBL_USERINFO_DEF = Database:: get_course_table(userinfo_def);
 
-    if (0 == (int) $rank || !($direction == "up" || $direction == "down")) {
+    if (0 == (int) $rank || !("up" == $direction || "down" == $direction)) {
         return false;
     }
 
-    if ($direction == "down") {
+    if ("down" == $direction) {
         // thus increase rank ...
         $sort = "ASC";
         $compOp = ">=";
@@ -255,7 +255,7 @@ function update_user_course_properties($user_id, $course_code, $properties, $hor
              ORDER BY date ";
     $result3 = Database::query($sql3);
 
-    if (Database::num_rows($result3) == '0') {
+    if ('0' == Database::num_rows($result3)) {
         return false;
     }
 
@@ -322,7 +322,7 @@ function fill_new_cat_content($definition_id, $user_id, $content = "", $user_ip
     $content = Database::escape_string(trim($content));
     $user_ip = Database::escape_string(trim($user_ip));
 
-    if (0 == $definition_id || 0 == $user_id || $content == "") {
+    if (0 == $definition_id || 0 == $user_id || "" == $content) {
         // Here we should introduce an error handling system...
 
         return false;
@@ -379,7 +379,7 @@ function edit_cat_content($definition_id, $user_id, $content = "", $user_ip = ""
         return false;
     }
 
-    if ($content == "") {
+    if ("" == $content) {
         return cleanout_cat_content($user_id, $definition_id);
     }
 
diff --git a/public/main/forum/forumfunction.inc.php b/public/main/forum/forumfunction.inc.php
index 4a55853eb7..1401fe87b9 100644
--- a/public/main/forum/forumfunction.inc.php
+++ b/public/main/forum/forumfunction.inc.php
@@ -141,7 +141,7 @@ function handle_forum_and_forumcategories($lp_id = null)
     // Delete a forum category
     if ('delete' === $action_forum_cat) {
         $list_threads = get_threads($get_id);
-        for ($i = 0; $i < count($list_threads); ++$i) {
+        for ($i = 0; $i < count($list_threads); $i++) {
             deleteForumCategoryThread('thread', $list_threads[$i]['thread_id']);
             $link_info = GradebookUtils::isResourceInCourseGradebook(
                 api_get_course_id(),
@@ -1321,7 +1321,7 @@ function return_up_down_icon($content, $id, $list)
 
     if (is_array($list)) {
         foreach ($list as $key => $listitem) {
-            ++$internal_counter;
+            $internal_counter++;
             if ($id == $key) {
                 $position = $internal_counter;
             }
@@ -2295,7 +2295,7 @@ function getPosts(
     }
 
     $posts = $qb->getQuery()->getResult();
-    ++$depth;
+    $depth++;
 
     $list = [];
     /** @var CForumPost $post */
@@ -2558,7 +2558,7 @@ function get_thread_users_not_qualify($thread_id)
 /**
  * This function retrieves all the information of a given forumcategory id.
  *
- * @param integer $cat_id that indicates the forum
+ * @param int $cat_id that indicates the forum
  *
  * @return array returns if there are category or bool returns if there aren't category
  *
@@ -2726,9 +2726,9 @@ function updateThread($values)
  * This function stores a new thread. This is done through an entry in the forum_thread table AND
  * in the forum_post table because. The threads are also stored in the item_property table. (forum posts are not (yet)).
  *
- * @param bool  $showMessage
- * @param int   $userId      Optional. The user ID
- * @param int   $sessionId
+ * @param bool $showMessage
+ * @param int  $userId      Optional. The user ID
+ * @param int  $sessionId
  *
  * @return CForumThread
  *
@@ -5082,7 +5082,7 @@ function prepare4display($input)
                 '<span style="background-color: '.$highlightcolors[$counter].'">$0</span>',
                 $input
             );
-            ++$counter;
+            $counter++;
         }
     }
 
@@ -5304,7 +5304,7 @@ function add_forum_attachment_file($file_comment, $last_id)
     } else {
         $fileCount = count($_FILES['user_upload']['name']);
         $fileKeys = array_keys($_FILES['user_upload']);
-        for ($i = 0; $i < $fileCount; ++$i) {
+        for ($i = 0; $i < $fileCount; $i++) {
             foreach ($fileKeys as $key) {
                 $filesData[$i][$key] = $_FILES['user_upload'][$key][$i];
             }
@@ -5400,7 +5400,7 @@ function edit_forum_attachment_file($file_comment, $post_id, $id_attach)
         $fileCount = count($_FILES['user_upload']['name']);
         $fileKeys = array_keys($_FILES['user_upload']);
 
-        for ($i = 0; $i < $fileCount; ++$i) {
+        for ($i = 0; $i < $fileCount; $i++) {
             foreach ($fileKeys as $key) {
                 $filesData[$i][$key] = $_FILES['user_upload'][$key][$i];
             }
@@ -5537,7 +5537,6 @@ function getAllAttachment($postId)
  * @param int $id_attach
  *
  * @return bool
- *
  */
 function delete_attachment($postId, $id_attach = 0)
 {
@@ -6178,7 +6177,7 @@ function get_all_post_from_user($user_id, $course_code)
                             }
                         }
                     }
-                    ++$i;
+                    $i++;
                 }
                 $forum_results .= '<div id="social-forum">';
                 $forum_results .= '<div class="clear"></div><br />';
@@ -6195,7 +6194,7 @@ function get_all_post_from_user($user_id, $course_code)
                 }
                 $forum_results .= '</div>';
             }
-            ++$j;
+            $j++;
         }
     }
 
@@ -6317,7 +6316,7 @@ function forumRecursiveSort($rows, &$threads, $seed = 0, $indent = 0)
     if ($seed > 0) {
         $threads[$rows[$seed]['post_id']] = $rows[$seed];
         $threads[$rows[$seed]['post_id']]['indent_cnt'] = $indent;
-        ++$indent;
+        $indent++;
     }
 
     if (isset($rows[$seed]['children'])) {
@@ -6749,8 +6748,8 @@ function getPostStatus(CForumForum $forum, $row, $addWrapper = true)
 
 /**
  * @param CForumForum $forum
- * @param int   $threadId
- * @param int   $status
+ * @param int         $threadId
+ * @param int         $status
  */
 function getCountPostsWithStatus($status, $forum, $threadId = null)
 {
diff --git a/public/main/forum/forumqualify.php b/public/main/forum/forumqualify.php
index 6946652910..3af8331b8c 100644
--- a/public/main/forum/forumqualify.php
+++ b/public/main/forum/forumqualify.php
@@ -294,7 +294,7 @@ if (isset($rows)) {
         }
 
         echo '</table></div>';
-        ++$counter;
+        $counter++;
     }
 }
 
@@ -322,7 +322,7 @@ if (api_is_allowed_to_edit() && $counter > 0) {
     $table_list .= '<th width="40%">'.get_lang('Date changed').'</th>';
     $table_list .= '</tr>';
 
-    for ($i = 0; $i < count($historyList); ++$i) {
+    for ($i = 0; $i < count($historyList); $i++) {
         $userInfo = api_get_user_info($historyList[$i]['qualify_user_id']);
         $table_list .= '<tr><td>'.$userInfo['complete_name'].'</td>';
         $table_list .= '<td>'.$historyList[$i]['qualify'].'</td>';
diff --git a/public/main/forum/index.php b/public/main/forum/index.php
index 584b88df77..e568a12571 100644
--- a/public/main/forum/index.php
+++ b/public/main/forum/index.php
@@ -401,7 +401,7 @@ if (is_array($forumCategories)) {
                     }
 
                     if ($show_forum) {
-                        ++$form_count;
+                        $form_count++;
                         /*$mywhatsnew_post_info = isset($whatsnew_post_info[$forum['forum_id']])
                             ? $whatsnew_post_info[$forum['forum_id']]
                             : null;*/
diff --git a/public/main/forum/viewforum.php b/public/main/forum/viewforum.php
index 62a4aa9c9a..bc50c7362a 100644
--- a/public/main/forum/viewforum.php
+++ b/public/main/forum/viewforum.php
@@ -305,7 +305,7 @@ if ('liststd' == $my_action &&
                         .$current_qualify_thread.'">'
                         .Display::return_icon($icon_qualify, get_lang('Grade activity')).'</a></td></tr>';
                 }
-                ++$counter_stdlist;
+                $counter_stdlist++;
             }
         } else {
             if ('qualify' === $listType) {
@@ -653,7 +653,7 @@ if (is_array($threads)) {
 
             echo $html;
         }
-        ++$count;
+        $count++;
     }
 }
 
diff --git a/public/main/forum/viewforumcategory.php b/public/main/forum/viewforumcategory.php
index 66d66b62d3..b39a3aa59a 100644
--- a/public/main/forum/viewforumcategory.php
+++ b/public/main/forum/viewforumcategory.php
@@ -303,7 +303,7 @@ if ('add' != $action) {
                 }
                 $form_count = isset($form_count) ? $form_count : 0;
                 if (true === $show_forum) {
-                    ++$form_count;
+                    $form_count++;
                     $html = '<div class="panel panel-default forum">';
                     $html .= '<div class="panel-body">';
                     $my_whatsnew_post_info = isset($whatsnew_post_info[$forum['forum_id']]) ? $whatsnew_post_info[$forum['forum_id']] : null;
diff --git a/public/main/forum/viewthread.php b/public/main/forum/viewthread.php
index 39969b2fe9..af5b6f5fcf 100644
--- a/public/main/forum/viewthread.php
+++ b/public/main/forum/viewthread.php
@@ -662,7 +662,7 @@ foreach ($posts as $post) {
     // The post has been displayed => it can be removed from the what's new array
     //unset($whatsnew_post_info[$current_forum['forum_id']][$current_thread['thread_id']][$post['post_id']]);
     //unset($_SESSION['whatsnew_post_info'][$current_forum['forum_id']][$current_thread['thread_id']][$post['post_id']]);
-    ++$count;
+    $count++;
 }
 
 $template->assign('posts', $postList);
diff --git a/public/main/gamification/my_progress.php b/public/main/gamification/my_progress.php
index 746a043c22..f74ad71dd0 100644
--- a/public/main/gamification/my_progress.php
+++ b/public/main/gamification/my_progress.php
@@ -7,8 +7,6 @@ use Chamilo\CoreBundle\Repository\TrackECourseAccessRepository;
  * See the progress for a user when the gamification mode is active.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.gamification
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -18,7 +16,7 @@ $nameTools = get_lang('Progress');
 
 api_block_anonymous_users();
 
-if (api_get_setting('gamification_mode') == '0') {
+if ('0' == api_get_setting('gamification_mode')) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/gradebook/certificate_report.php b/public/main/gradebook/certificate_report.php
index 63a4b8bbb9..1a17e5ff9c 100644
--- a/public/main/gradebook/certificate_report.php
+++ b/public/main/gradebook/certificate_report.php
@@ -5,8 +5,6 @@
  * List all certificates filtered by session/course and month/year.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.gradebook
  */
 $cidReset = true;
 
diff --git a/public/main/gradebook/exercise_jump.php b/public/main/gradebook/exercise_jump.php
index 3472e58b9e..b2cc2887e6 100644
--- a/public/main/gradebook/exercise_jump.php
+++ b/public/main/gradebook/exercise_jump.php
@@ -9,8 +9,6 @@
  * Most code here is ripped from /main/course_home/course_home.php.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 api_block_anonymous_users();
@@ -57,7 +55,7 @@ if (!empty($doExerciseUrl)) {
             if ($exercise->exercise_was_added_in_lp) {
                 if (!empty($exercise->lpList)) {
                     $count = count($exercise->lpList);
-                    if ($count == 1) {
+                    if (1 == $count) {
                         // If the exercise was added once redirect to the LP
                         $firstLp = current($exercise->lpList);
                         if (isset($firstLp['lp_id'])) {
diff --git a/public/main/gradebook/get_badges.php b/public/main/gradebook/get_badges.php
index 1d45d2b247..c5b08fa515 100644
--- a/public/main/gradebook/get_badges.php
+++ b/public/main/gradebook/get_badges.php
@@ -5,8 +5,6 @@
  * Show the achieved badges by an user.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.badge
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -45,7 +43,7 @@ foreach ($userSkills as $skill) {
 $backpack = 'https://backpack.openbadges.org/';
 
 $configBackpack = api_get_setting('openbadges_backpack');
-if (strcmp($backpack, $configBackpack) !== 0) {
+if (0 !== strcmp($backpack, $configBackpack)) {
     $backpack = $configBackpack;
 }
 
diff --git a/public/main/gradebook/gradebook.php b/public/main/gradebook/gradebook.php
index 0e018c6d74..b33720fa06 100644
--- a/public/main/gradebook/gradebook.php
+++ b/public/main/gradebook/gradebook.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 
 // $cidReset : This is the main difference with gradebook.php, here we say,
@@ -52,7 +50,7 @@ $filter_warning_msg = true;
 if (isset($_GET['createallcategories'])) {
     GradebookUtils::block_students();
     $coursecat = Category :: get_not_created_course_categories(api_get_user_id());
-    if (!count($coursecat) == 0) {
+    if (0 == !count($coursecat)) {
         foreach ($coursecat as $row) {
             $cat = new Category();
             $cat->set_name($row[1]);
@@ -92,7 +90,7 @@ if (isset($_GET['movecat'])) {
     } else {
         $get_target_cat = Security::remove_XSS($_GET['targetcat']);
         $targetcat = Category :: load($get_target_cat);
-        $course_to_crsind = ($cats[0]->get_course_code() != null && $targetcat[0]->get_course_code() == null);
+        $course_to_crsind = (null != $cats[0]->get_course_code() && null == $targetcat[0]->get_course_code());
 
         if (!($course_to_crsind && !isset($_GET['confirm']))) {
             $cats[0]->move_to_cat($targetcat[0]);
@@ -128,7 +126,7 @@ if (isset($_GET['moveeval'])) {
     } else {
         $get_target_cat = Security::remove_XSS($_GET['targetcat']);
         $targetcat = Category :: load($get_target_cat);
-        $course_to_crsind = ($evals[0]->get_course_code() != null && $targetcat[0]->get_course_code() == null);
+        $course_to_crsind = (null != $evals[0]->get_course_code() && null == $targetcat[0]->get_course_code());
 
         if (!($course_to_crsind && !isset($_GET['confirm']))) {
             $evals[0]->move_to_cat($targetcat[0]);
@@ -187,8 +185,8 @@ if (isset($_GET['deletecat'])) {
     GradebookUtils::block_students();
     $cats = Category :: load($_GET['deletecat']);
     //delete all categories,subcategories and results
-    if ($cats[0] != null) {
-        if ($cats[0]->get_id() != 0) {
+    if (null != $cats[0]) {
+        if (0 != $cats[0]->get_id()) {
             // better don't try to delete the root...
             $cats[0]->delete_all();
         }
@@ -222,7 +220,7 @@ if (isset($_GET['visibleeval'])) {
 if (isset($_GET['deleteeval'])) {
     GradebookUtils::block_students();
     $eval = Evaluation :: load($_GET['deleteeval']);
-    if ($eval[0] != null) {
+    if (null != $eval[0]) {
         $eval[0]->delete_with_results();
     }
     $confirmation_message = get_lang('Assessment deleted');
@@ -253,7 +251,7 @@ if (isset($_GET['deletelink'])) {
     //fixing #5229
     if (!empty($_GET['deletelink'])) {
         $link = LinkFactory:: load($_GET['deletelink']);
-        if ($link[0] != null) {
+        if (null != $link[0]) {
             $link[0]->delete();
         }
         unset($link);
@@ -283,7 +281,7 @@ if ($course_to_crsind && !isset($_GET['confirm'])) {
 if (isset($_POST['action'])) {
     GradebookUtils::block_students();
     $number_of_selected_items = count($_POST['id']);
-    if ($number_of_selected_items == '0') {
+    if ('0' == $number_of_selected_items) {
         $warning_message = get_lang('No resource selected');
         $filter_warning_msg = false;
     } else {
@@ -293,25 +291,25 @@ if (isset($_POST['action'])) {
                 $number_of_deleted_evaluations = 0;
                 $number_of_deleted_links = 0;
                 foreach ($_POST['id'] as $indexstr) {
-                    if (api_substr($indexstr, 0, 4) == 'CATE') {
+                    if ('CATE' == api_substr($indexstr, 0, 4)) {
                         $cats = Category :: load(api_substr($indexstr, 4));
-                        if ($cats[0] != null) {
+                        if (null != $cats[0]) {
                             $cats[0]->delete_all();
                         }
                         $number_of_deleted_categories++;
                     }
-                    if (api_substr($indexstr, 0, 4) == 'EVAL') {
+                    if ('EVAL' == api_substr($indexstr, 0, 4)) {
                         $eval = Evaluation :: load(api_substr($indexstr, 4));
-                        if ($eval[0] != null) {
+                        if (null != $eval[0]) {
                             $eval[0]->delete_with_results();
                         }
                         $number_of_deleted_evaluations++;
                     }
-                    if (api_substr($indexstr, 0, 4) == 'LINK') {
+                    if ('LINK' == api_substr($indexstr, 0, 4)) {
                         $id = api_substr($indexstr, 4);
                         if (!empty($id)) {
                             $link = LinkFactory :: load();
-                            if ($link[0] != null) {
+                            if (null != $link[0]) {
                                 $link[0]->delete();
                             }
                             $number_of_deleted_links++;
@@ -323,18 +321,18 @@ if (isset($_POST['action'])) {
                 break;
             case 'setvisible':
                 foreach ($_POST['id'] as $indexstr) {
-                    if (api_substr($indexstr, 0, 4) == 'CATE') {
+                    if ('CATE' == api_substr($indexstr, 0, 4)) {
                         $cats = Category:: load(api_substr($indexstr, 4));
                         $cats[0]->set_visible(1);
                         $cats[0]->save();
                         $cats[0]->apply_visibility_to_children();
                     }
-                    if (api_substr($indexstr, 0, 4) == 'EVAL') {
+                    if ('EVAL' == api_substr($indexstr, 0, 4)) {
                         $eval = Evaluation:: load(api_substr($indexstr, 4));
                         $eval[0]->set_visible(1);
                         $eval[0]->save();
                     }
-                    if (api_substr($indexstr, 0, 4) == 'LINK') {
+                    if ('LINK' == api_substr($indexstr, 0, 4)) {
                         $link = LinkFactory:: load(api_substr($indexstr, 4));
                         $link[0]->set_visible(1);
                         $link[0]->save();
@@ -345,18 +343,18 @@ if (isset($_POST['action'])) {
                 break;
             case 'setinvisible':
                 foreach ($_POST['id'] as $indexstr) {
-                    if (api_substr($indexstr, 0, 4) == 'CATE') {
+                    if ('CATE' == api_substr($indexstr, 0, 4)) {
                         $cats = Category:: load(api_substr($indexstr, 4));
                         $cats[0]->set_visible(0);
                         $cats[0]->save();
                         $cats[0]->apply_visibility_to_children();
                     }
-                    if (api_substr($indexstr, 0, 4) == 'EVAL') {
+                    if ('EVAL' == api_substr($indexstr, 0, 4)) {
                         $eval = Evaluation:: load(api_substr($indexstr, 4));
                         $eval[0]->set_visible(0);
                         $eval[0]->save();
                     }
-                    if (api_substr($indexstr, 0, 4) == 'LINK') {
+                    if ('LINK' == api_substr($indexstr, 0, 4)) {
                         $link = LinkFactory:: load(api_substr($indexstr, 4));
                         $link[0]->set_visible(0);
                         $link[0]->save();
@@ -482,7 +480,7 @@ if ($simple_search_form->validate() && (empty($keyword))) {
 if (!empty($keyword)) {
     $cats = Category :: load($category);
     $allcat = [];
-    if ((isset($_GET['selectcat']) && $_GET['selectcat'] == 0) && isset($_GET['search'])) {
+    if ((isset($_GET['selectcat']) && 0 == $_GET['selectcat']) && isset($_GET['search'])) {
         $allcat = $cats[0]->get_subcategories(null);
         $allcat_info = Category::find_category($keyword, $allcat);
         $alleval = [];
@@ -605,7 +603,7 @@ if (isset($_GET['studentoverview'])) {
     $addparams['studentoverview'] = '';
 }
 if (isset($allcat_info) && count($allcat_info) >= 0 &&
-    (isset($_GET['selectcat']) && $_GET['selectcat'] == 0) &&
+    (isset($_GET['selectcat']) && 0 == $_GET['selectcat']) &&
     isset($_GET['search']) && strlen(trim($_GET['search'])) > 0
 ) {
     $allcat = $allcat_info;
@@ -633,7 +631,7 @@ if (empty($allcat) && empty($alleval) && empty($alllink) &&
     );
 }
 // Here we are in a sub category
-if ($category != '0') {
+if ('0' != $category) {
     DisplayGradebook::header(
         $cats[0],
         1,
@@ -646,7 +644,7 @@ if ($category != '0') {
     // This is the root category
     DisplayGradebook:: header(
         $cats[0],
-        count($allcat) == '0' && !isset($_GET['search']) ? 0 : 1,
+        '0' == count($allcat) && !isset($_GET['search']) ? 0 : 1,
         0,
         $is_course_admin,
         $is_platform_admin,
diff --git a/public/main/gradebook/gradebook_add_cat.php b/public/main/gradebook/gradebook_add_cat.php
index cafc33e0a9..834f3b3cc5 100644
--- a/public/main/gradebook/gradebook_add_cat.php
+++ b/public/main/gradebook/gradebook_add_cat.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $_in_course = true;
@@ -44,8 +42,8 @@ if ($form->validate()) {
     $values = $form->exportValues();
     $select_course = isset($values['select_course']) ? $values['select_course'] : [];
     $cat = new Category();
-    if ($values['hid_parent_id'] == '0') {
-        if ($select_course == 'COURSEINDEPENDENT') {
+    if ('0' == $values['hid_parent_id']) {
+        if ('COURSEINDEPENDENT' == $select_course) {
             $cat->set_name($values['name']);
             $cat->set_course_code(null);
         } else {
diff --git a/public/main/gradebook/gradebook_add_eval.php b/public/main/gradebook/gradebook_add_eval.php
index 2f61f597cf..bce5b04ca3 100644
--- a/public/main/gradebook/gradebook_add_eval.php
+++ b/public/main/gradebook/gradebook_add_eval.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_GRADEBOOK;
@@ -75,8 +73,8 @@ if ($form->validate()) {
     ];
     Event::registerLog($logInfo);
 
-    if ($eval->get_course_code() == null) {
-        if ($values['adduser'] == 1) {
+    if (null == $eval->get_course_code()) {
+        if (1 == $values['adduser']) {
             //Disabling code when course code is null see issue #2705
             //header('Location: gradebook_add_user.php?selecteval=' . $eval->get_id());
             exit;
@@ -86,7 +84,7 @@ if ($form->validate()) {
         }
     } else {
         $val_addresult = isset($values['addresult']) ? $values['addresult'] : null;
-        if ($val_addresult == 1) {
+        if (1 == $val_addresult) {
             header('Location: gradebook_add_result.php?selecteval='.$eval->get_id().'&'.api_get_cidreq());
             exit;
         } else {
@@ -130,7 +128,7 @@ $(function() {
 });
 </script>';
 
-if ($evaladd->get_course_code() == null) {
+if (null == $evaladd->get_course_code()) {
     Display::addFlash(Display::return_message(get_lang('Course independent evaluation'), 'normal', false));
 }
 
diff --git a/public/main/gradebook/gradebook_add_link.php b/public/main/gradebook/gradebook_add_link.php
index 30394589ad..c6b489e96c 100644
--- a/public/main/gradebook/gradebook_add_link.php
+++ b/public/main/gradebook/gradebook_add_link.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 require_once '../forum/forumfunction.inc.php';
@@ -24,7 +22,7 @@ $tbl_link = Database::get_main_table(TABLE_MAIN_GRADEBOOK_LINK);
 $session_id = api_get_session_id();
 $typeSelected = isset($_GET['typeselected']) ? intval($_GET['typeselected']) : null;
 
-if ($session_id == 0) {
+if (0 == $session_id) {
     $all_categories = Category::load(
         null,
         null,
@@ -60,7 +58,7 @@ if ($typeform->validate() && isset($_GET['newtypeselected'])) {
 }
 
 // link type selected, show 2nd form to retrieve the link data
-if (isset($typeSelected) && $typeSelected != '0') {
+if (isset($typeSelected) && '0' != $typeSelected) {
     $url = api_get_self().'?selectcat='.$selectCat.'&typeselected='.$typeSelected.'&course_code='.$courseCode.'&'.api_get_cidreq();
 
     $addform = new LinkAddEditForm(
@@ -101,7 +99,7 @@ if (isset($typeSelected) && $typeSelected != '0') {
         // Update view_properties
         if (isset($typeSelected) &&
             5 == $typeSelected &&
-            (isset($addvalues['select_link']) && $addvalues['select_link'] != "")
+            (isset($addvalues['select_link']) && "" != $addvalues['select_link'])
         ) {
             $sql1 = 'SELECT thread_title from '.$tbl_forum_thread.'
 					 WHERE 
@@ -117,7 +115,7 @@ if (isset($typeSelected) && $typeSelected != '0') {
                             type = 5;';
             $res_l = Database::query($sql_l);
             $row = Database::fetch_row($res_l);
-            if ($row[0] == 0) {
+            if (0 == $row[0]) {
                 $link->add();
                 $sql = 'UPDATE '.$tbl_forum_thread.' SET
                             thread_qualify_max= "'.api_float_val($addvalues['weight']).'",
@@ -142,7 +140,7 @@ if (isset($typeSelected) && $typeSelected != '0') {
         Event::registerLog($logInfo);
 
         $addvalue_result = !empty($addvalues['addresult']) ? $addvalues['addresult'] : [];
-        if ($addvalue_result == 1) {
+        if (1 == $addvalue_result) {
             header('Location: gradebook_add_result.php?selecteval='.$link->get_ref_id().'&'.api_get_cidreq());
             exit;
         } else {
diff --git a/public/main/gradebook/gradebook_add_link_select_course.php b/public/main/gradebook/gradebook_add_link_select_course.php
index 58fa5ad205..c7ad8204b3 100644
--- a/public/main/gradebook/gradebook_add_link_select_course.php
+++ b/public/main/gradebook/gradebook_add_link_select_course.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_GRADEBOOK;
diff --git a/public/main/gradebook/gradebook_add_result.php b/public/main/gradebook/gradebook_add_result.php
index cf717c08b1..c3f4f897f9 100644
--- a/public/main/gradebook/gradebook_add_result.php
+++ b/public/main/gradebook/gradebook_add_result.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 //$cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -32,7 +30,7 @@ $table = $add_result_form->toHtml();
 if ($add_result_form->validate()) {
     $values = $add_result_form->exportValues();
     $nr_users = $values['nr_users'];
-    if ($nr_users == '0') {
+    if ('0' == $nr_users) {
         Display::addFlash(Display::return_message(get_lang('There are no learners to add results for'), 'warning', false));
         header('Location: gradebook_view_result.php?addresultnostudents=&selecteval='.$selectEval.'&'.api_get_cidreq());
         exit;
@@ -47,7 +45,7 @@ if ($add_result_form->validate()) {
         $res->set_evaluation_id($values['evaluation_id']);
         $res->set_user_id(key($scores));
         //if no scores are given, don't set the score
-        if (!empty($row) || $row == '0') {
+        if (!empty($row) || '0' == $row) {
             $res->set_score($row);
         }
         $res->add();
diff --git a/public/main/gradebook/gradebook_add_user.php b/public/main/gradebook/gradebook_add_user.php
index 220cc6d409..453805354f 100644
--- a/public/main/gradebook/gradebook_add_user.php
+++ b/public/main/gradebook/gradebook_add_user.php
@@ -3,8 +3,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 
 //Disabling code when course code is null (gradebook as a tab) see issue #2705
@@ -18,7 +16,7 @@ GradebookUtils::block_students();
 $evaluation = Evaluation::load($_GET['selecteval']);
 $newstudents = $evaluation[0]->get_not_subscribed_students();
 
-if (count($newstudents) == '0') {
+if ('0' == count($newstudents)) {
     header('Location: gradebook_view_result.php?nouser=&selecteval='.intval($_GET['selecteval']).'&'.api_get_cidreq());
     exit;
 }
@@ -39,7 +37,7 @@ if (isset($_POST['submit_button'])) {
         $users[$key] = intval($value);
     }
 
-    if (count($users) == 0) {
+    if (0 == count($users)) {
         header('Location: '.api_get_self().'?erroroneuser=&selecteval='.Security::remove_XSS($_GET['selecteval']));
         exit;
     } else {
diff --git a/public/main/gradebook/gradebook_display_certificate.php b/public/main/gradebook/gradebook_display_certificate.php
index 0414a551dc..dff4385e26 100644
--- a/public/main/gradebook/gradebook_display_certificate.php
+++ b/public/main/gradebook/gradebook_display_certificate.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_GRADEBOOK;
@@ -44,7 +42,7 @@ $filter = api_get_setting('certificate_filter_by_official_code');
 $userList = [];
 $filterForm = null;
 $certificate_list = [];
-if ($filter === 'true') {
+if ('true' === $filter) {
     $options = UserManager::getOfficialCodeGrouped();
     $options = array_merge(['all' => get_lang('All')], $options);
     $form = new FormValidator(
@@ -58,7 +56,7 @@ if ($filter === 'true') {
 
     if ($form->validate()) {
         $officialCode = $form->getSubmitValue('filter');
-        if ($officialCode == 'all') {
+        if ('all' == $officialCode) {
             $certificate_list = GradebookUtils::get_list_users_certificates($categoryId);
         } else {
             $userList = UserManager::getUsersByOfficialCode($officialCode);
@@ -80,8 +78,8 @@ $content = '';
 
 $courseCode = api_get_course_id();
 
-$allowExportToZip = api_get_plugin_setting('customcertificate', 'enable_plugin_customcertificate') == 'true' &&
-    api_get_course_setting('customcertificate_course_enable', $courseInfo) == 1;
+$allowExportToZip = 'true' == api_get_plugin_setting('customcertificate', 'enable_plugin_customcertificate') &&
+    1 == api_get_course_setting('customcertificate_course_enable', $courseInfo);
 
 $tags = Certificate::notificationTags();
 
@@ -163,7 +161,7 @@ switch ($action) {
 
         if (!empty($userList)) {
             foreach ($userList as $userInfo) {
-                if ($userInfo['status'] == INVITEE) {
+                if (INVITEE == $userInfo['status']) {
                     continue;
                 }
                 Category::generateUserCertificate($categoryId, $userInfo['user_id']);
@@ -189,13 +187,13 @@ $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('AssessmentsListOfLearner
 $this_section = SECTION_COURSES;
 Display::display_header('');
 
-if (isset($_GET['action']) && $_GET['action'] == 'delete') {
+if (isset($_GET['action']) && 'delete' == $_GET['action']) {
     $check = Security::check_token('get');
     if ($check) {
         $certificate = new Certificate($_GET['certificate_id']);
         $result = $certificate->delete(true);
         Security::clear_token();
-        if ($result == true) {
+        if (true == $result) {
             echo Display::return_message(get_lang('Certificate removed'), 'confirmation');
         } else {
             echo Display::return_message(get_lang('Certificate can\'t be removed'), 'error');
@@ -273,7 +271,7 @@ $actions .= Display::url(
 
 $hideCertificateExport = api_get_setting('hide_certificate_export_link');
 
-if (count($certificate_list) > 0 && $hideCertificateExport !== 'true') {
+if (count($certificate_list) > 0 && 'true' !== $hideCertificateExport) {
     $actions .= Display::url(
         Display::return_icon('pdf.png', get_lang('Export all certificates to PDF'), [], ICON_SIZE_MEDIUM),
         $url.'&action=export_all_certificates'
@@ -296,7 +294,7 @@ echo Display::toolbarAction('actions', [$actions]);
 
 echo $filterForm;
 
-if (count($certificate_list) == 0) {
+if (0 == count($certificate_list)) {
     echo Display::return_message(get_lang('No results available'), 'warning');
 } else {
     echo '<table class="data_table">';
diff --git a/public/main/gradebook/gradebook_display_summary.php b/public/main/gradebook/gradebook_display_summary.php
index da652b2ed3..8658637098 100644
--- a/public/main/gradebook/gradebook_display_summary.php
+++ b/public/main/gradebook/gradebook_display_summary.php
@@ -3,9 +3,6 @@
 
 use ChamiloSession as Session;
 
-/**
- * @package chamilo.gradebook
- */
 require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_GRADEBOOK;
 
@@ -30,10 +27,10 @@ $userList = CourseManager::get_user_list_from_course_code(
 );
 
 $loadStats = [];
-if (api_get_setting('gradebook_detailed_admin_view') === 'true') {
+if ('true' === api_get_setting('gradebook_detailed_admin_view')) {
     $loadStats = [1, 2, 3];
 } else {
-    if (api_get_configuration_value('gradebook_enable_best_score') !== false) {
+    if (false !== api_get_configuration_value('gradebook_enable_best_score')) {
         $loadStats = [2];
     }
 }
@@ -174,7 +171,7 @@ echo '</div>';
 
 $allowSkillRelItem = api_get_configuration_value('allow_skill_rel_items');
 
-if (count($userList) == 0) {
+if (0 == count($userList)) {
     echo Display::return_message(get_lang('No results available'), 'warning');
 } else {
     echo '<br /><br /><table class="data_table">';
diff --git a/public/main/gradebook/gradebook_edit_all.php b/public/main/gradebook/gradebook_edit_all.php
index 69a2247d10..15be6046cc 100644
--- a/public/main/gradebook/gradebook_edit_all.php
+++ b/public/main/gradebook/gradebook_edit_all.php
@@ -4,8 +4,6 @@
 /**
  * Script.
  *
- * @package chamilo.gradebook
- *
  * @author Julio Montoya - fixes in order to use gradebook models + some code cleaning
  */
 require_once __DIR__.'/../inc/global.inc.php';
@@ -86,7 +84,7 @@ $table_evaluated[LINK_SURVEY] = [
 ];
 
 $submitted = isset($_POST['submitted']) ? $_POST['submitted'] : '';
-if ($submitted == 1) {
+if (1 == $submitted) {
     Display::addFlash(Display::return_message(get_lang('Weights updated successfully')));
     if (isset($_POST['evaluation'])) {
         $eval_log = new Evaluation();
@@ -206,7 +204,7 @@ if ($form->validate()) {
 
     foreach ($links as $link) {
         $weightToApply = $weight;
-        if ($diffApplied == false) {
+        if (false == $diffApplied) {
             if (!empty($diff)) {
                 $weightToApply = $weight - $diff;
                 $diffApplied = true;
@@ -221,7 +219,7 @@ if ($form->validate()) {
 
     foreach ($evaluations as $evaluation) {
         $weightToApply = $weight;
-        if ($diffApplied == false) {
+        if (false == $diffApplied) {
             if (!empty($diff)) {
                 $weightToApply = $weight - $diff;
                 $diffApplied = true;
diff --git a/public/main/gradebook/gradebook_edit_cat.php b/public/main/gradebook/gradebook_edit_cat.php
index fa1f3ab110..8d3718c4ad 100644
--- a/public/main/gradebook/gradebook_edit_cat.php
+++ b/public/main/gradebook/gradebook_edit_cat.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.gradebook
- */
 require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
@@ -60,7 +57,7 @@ if ($form->validate()) {
         $cat->setGenerateCertificates(false);
     }
 
-    if ($values['hid_parent_id'] == 0) {
+    if (0 == $values['hid_parent_id']) {
         $cat->set_certificate_min_score($values['certif_min_score']);
     }
 
diff --git a/public/main/gradebook/gradebook_edit_eval.php b/public/main/gradebook/gradebook_edit_eval.php
index 41c2b17b37..c9db8b32d4 100644
--- a/public/main/gradebook/gradebook_edit_eval.php
+++ b/public/main/gradebook/gradebook_edit_eval.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 api_block_anonymous_users();
diff --git a/public/main/gradebook/gradebook_edit_link.php b/public/main/gradebook/gradebook_edit_link.php
index e60344ab4a..a721e363dc 100644
--- a/public/main/gradebook/gradebook_edit_link.php
+++ b/public/main/gradebook/gradebook_edit_link.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -29,7 +27,7 @@ $linkedit = isset($_GET['editlink']) ? Security::remove_XSS($_GET['editlink']) :
 $course_code = api_get_course_id();
 $session_id = api_get_session_id();
 
-if ($session_id == 0) {
+if (0 == $session_id) {
     $cats = Category:: load(
         null,
         null,
diff --git a/public/main/gradebook/gradebook_edit_result.php b/public/main/gradebook/gradebook_edit_result.php
index 00ffcc1c5d..2a2ca05c18 100644
--- a/public/main/gradebook/gradebook_edit_result.php
+++ b/public/main/gradebook/gradebook_edit_result.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 api_block_anonymous_users();
diff --git a/public/main/gradebook/gradebook_flatview.php b/public/main/gradebook/gradebook_flatview.php
index d0738da9db..97979bfd74 100644
--- a/public/main/gradebook/gradebook_flatview.php
+++ b/public/main/gradebook/gradebook_flatview.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 require_once api_get_path(SYS_CODE_PATH).'gradebook/lib/fe/exportgradebook.php';
@@ -37,7 +35,7 @@ $interbreadcrumb[] = [
 
 $showeval = isset($_POST['showeval']) ? '1' : '0';
 $showlink = isset($_POST['showlink']) ? '1' : '0';
-if ($showlink == '0' && $showeval == '0') {
+if ('0' == $showlink && '0' == $showeval) {
     $showlink = '1';
     $showeval = '1';
 }
@@ -55,7 +53,7 @@ if ($showlink) {
     $alllinks = $cat[0]->get_links($userId, true);
 }
 
-if (isset($export_flatview_form) && !$file_type === 'pdf') {
+if (isset($export_flatview_form) && 'pdf' === !$file_type) {
     Display::addFlash(
         Display::return_message(
             $export_flatview_form->toHtml(),
@@ -127,12 +125,12 @@ $parameters = ['selectcat' => $categoryId];
 $flatViewTable->set_additional_parameters($parameters);
 
 $params = [];
-if (isset($_GET['export_pdf']) && $_GET['export_pdf'] == 'category') {
+if (isset($_GET['export_pdf']) && 'category' == $_GET['export_pdf']) {
     $params['only_total_category'] = true;
     $params['join_firstname_lastname'] = true;
     $params['show_official_code'] = true;
     $params['export_pdf'] = true;
-    if ($cat[0]->is_locked() == true || api_is_platform_admin()) {
+    if (true == $cat[0]->is_locked() || api_is_platform_admin()) {
         //Display::set_header(null, false, false);
         GradebookUtils::export_pdf_flatview(
             $flatViewTable,
@@ -211,7 +209,7 @@ if (isset($_GET['print'])) {
 }
 
 if (!empty($_GET['export_report']) &&
-    $_GET['export_report'] === 'export_report'
+    'export_report' === $_GET['export_report']
 ) {
     if (api_is_platform_admin() || api_is_course_admin() || api_is_session_general_coach() || $isDrhOfCourse) {
         $user_id = null;
@@ -274,7 +272,7 @@ if (isset($_GET['exportpdf'])) {
     Display::display_header(get_lang('List View'));
 }
 
-if (isset($_GET['isStudentView']) && $_GET['isStudentView'] == 'false') {
+if (isset($_GET['isStudentView']) && 'false' == $_GET['isStudentView']) {
     DisplayGradebook::display_header_reduce_flatview(
         $cat[0],
         $showeval,
@@ -282,7 +280,7 @@ if (isset($_GET['isStudentView']) && $_GET['isStudentView'] == 'false') {
         $simple_search_form
     );
     $flatViewTable->display();
-} elseif (isset($_GET['selectcat']) && isset($_GET['isStudentView']) && ($_SESSION['studentview'] == 'teacherview')) {
+} elseif (isset($_GET['selectcat']) && isset($_GET['isStudentView']) && ('teacherview' == $_SESSION['studentview'])) {
     DisplayGradebook::display_header_reduce_flatview(
         $cat[0],
         $showeval,
diff --git a/public/main/gradebook/gradebook_scoring_system.php b/public/main/gradebook/gradebook_scoring_system.php
index a2f0f513b4..713978e8bb 100644
--- a/public/main/gradebook/gradebook_scoring_system.php
+++ b/public/main/gradebook/gradebook_scoring_system.php
@@ -3,15 +3,13 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
 GradebookUtils::block_students();
 
-if (api_get_setting('teachers_can_change_score_settings') != 'true') {
+if ('true' != api_get_setting('teachers_can_change_score_settings')) {
     api_not_allowed();
 }
 
@@ -50,7 +48,7 @@ $select_cat = intval($_GET['selectcat']);
 $displayScore = ScoreDisplay :: instance();
 $customdisplays = $displayScore->get_custom_score_display_settings();
 
-$nr_items = count($customdisplays) != '0' ? count($customdisplays) : '1';
+$nr_items = '0' != count($customdisplays) ? count($customdisplays) : '1';
 $scoreform = new ScoreDisplayForm(
     'scoring_system_form',
     api_get_self().'?selectcat='.$select_cat.'&'.api_get_cidreq()
diff --git a/public/main/gradebook/gradebook_showlog_eval.php b/public/main/gradebook/gradebook_showlog_eval.php
index c43bf772d0..e4fdda8b7e 100644
--- a/public/main/gradebook/gradebook_showlog_eval.php
+++ b/public/main/gradebook/gradebook_showlog_eval.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 api_block_anonymous_users();
@@ -48,7 +46,7 @@ while ($row = Database::fetch_row($result)) {
 
 foreach ($list_info as $key => $info_log) {
     $list_info[$key][5] = $info_log[5] ? api_convert_and_format_date($info_log[5]) : 'N/A';
-    $list_info[$key][3] = $info_log[3] == 1 ? get_lang('AssessmentsVisible') : get_lang('AssessmentsInvisible');
+    $list_info[$key][3] = 1 == $info_log[3] ? get_lang('AssessmentsVisible') : get_lang('AssessmentsInvisible');
     $userInfo = api_get_user_info($info_log[6]);
     if ($userInfo) {
         $list_info[$key][6] = $userInfo['complete_name_with_message_link'];
diff --git a/public/main/gradebook/gradebook_showlog_link.php b/public/main/gradebook/gradebook_showlog_link.php
index 733f03907a..a5248f82a7 100644
--- a/public/main/gradebook/gradebook_showlog_link.php
+++ b/public/main/gradebook/gradebook_showlog_link.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -47,7 +45,7 @@ while ($row = Database::fetch_row($result)) {
 
 foreach ($list_info as $key => $info_log) {
     $list_info[$key][5] = ($info_log[5]) ? api_convert_and_format_date($info_log[5]) : 'N/A';
-    $list_info[$key][3] = ($info_log[3] == 1) ? get_lang('AssessmentsVisible') : get_lang('AssessmentsInvisible');
+    $list_info[$key][3] = (1 == $info_log[3]) ? get_lang('AssessmentsVisible') : get_lang('AssessmentsInvisible');
 }
 
 $parameters = [
diff --git a/public/main/gradebook/gradebook_statistics.php b/public/main/gradebook/gradebook_statistics.php
index 8c50e901ba..f00146b1ee 100644
--- a/public/main/gradebook/gradebook_statistics.php
+++ b/public/main/gradebook/gradebook_statistics.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -95,7 +93,7 @@ if (!$displayScore->is_custom() || empty($displays)) {
     $model = ExerciseLib::getCourseScoreModel();
     foreach ($keys as $key) {
         $bar = ($highest_ratio > 0 ? ($nr_items[$key] / $highest_ratio) * 100 : 0);
-        $html .= '<tr class="row_'.($counter % 2 == 0 ? 'odd' : 'even').'">';
+        $html .= '<tr class="row_'.(0 == $counter % 2 ? 'odd' : 'even').'">';
         $html .= '<td width="150">'.$key.'</td>';
         if (empty($model)) {
             $html .= '<td width="550">'.Display::bar_progress($bar).'</td>';
diff --git a/public/main/gradebook/gradebook_view_result.php b/public/main/gradebook/gradebook_view_result.php
index 8a705cfc39..9708874b7e 100644
--- a/public/main/gradebook/gradebook_view_result.php
+++ b/public/main/gradebook/gradebook_view_result.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 require_once api_get_path(SYS_CODE_PATH).'gradebook/lib/fe/exportgradebook.php';
@@ -185,7 +183,7 @@ if (isset($_GET['editres'])) {
         $result->set_user_id($values['hid_user_id']);
         $result->set_evaluation_id($select_eval);
         $row_value = isset($values['score']) ? $values['score'] : 0;
-        if (!empty($row_value) || $row_value == 0) {
+        if (!empty($row_value) || 0 == $row_value) {
             $row_value = api_number_format(
                 $row_value,
                 api_get_setting('gradebook_number_decimals')
@@ -262,7 +260,7 @@ if (isset($_GET['import'])) {
                         }
                     }
                 }
-                if ($importedresult['user_id'] == null) {
+                if (null == $importedresult['user_id']) {
                     header('Location: gradebook_view_result.php?selecteval='.$select_eval.'&incorrectdata=');
                     exit;
                 }
@@ -276,7 +274,7 @@ if (isset($_GET['import'])) {
                         exit;
                     }
                 }
-                if ($added != '1') {
+                if ('1' != $added) {
                     if ($importedresult['score'] > $eval[0]->get_max()) {
                         header('Location: gradebook_view_result.php?selecteval='.$select_eval.'&overwritemax=');
                         exit;
@@ -309,7 +307,7 @@ if (isset($_GET['import'])) {
             header('Location: '.api_get_self().'?import=&selecteval='.$select_eval.'&importnofile=');
             exit;
         }
-        if ($overwritescore != 0) {
+        if (0 != $overwritescore) {
             Display::addFlash(
                 Display::return_message(
                     get_lang('The import should overwrite the score.').' '.$overwritescore
@@ -318,7 +316,7 @@ if (isset($_GET['import'])) {
             header('Location: '.api_get_self().'?selecteval='.$select_eval.'&importoverwritescore='.$overwritescore);
             exit;
         }
-        if ($nr_results_added == 0) {
+        if (0 == $nr_results_added) {
             Display::addFlash(
                 Display::return_message(
                     get_lang('There was a problem sending your file. Nothing has been received.'),
@@ -365,7 +363,7 @@ if (isset($_GET['export'])) {
         $filename = 'export_results_'.gmdate('Y-m-d_H-i-s');
         $results = Result::load(null, null, $select_eval);
         $data = []; //when file type is csv, add a header to the output file
-        if ($file_type == 'csv') {
+        if ('csv' == $file_type) {
             $alldata[] = [
                 'username',
                 'official_code',
@@ -377,7 +375,7 @@ if (isset($_GET['export'])) {
         }
 
         // export results to pdf file
-        if ($file_type == 'pdf') {
+        if ('pdf' == $file_type) {
             $number_decimals = api_get_setting('gradebook_number_decimals');
             $datagen = new ResultsDataGenerator($eval[0], $allresults);
 
@@ -416,7 +414,7 @@ if (isset($_GET['export'])) {
                 [$head_ape_name, 40],
                 [get_lang('Score'), 12],
             ];
-            if ($number_decimals == null) {
+            if (null == $number_decimals) {
                 $head_table[] = [get_lang('Letters'), 15];
             }
             $head_display_score = '';
@@ -457,7 +455,7 @@ if (isset($_GET['export'])) {
                 } else {
                     $result[] = $user_info['lastname'].', '.$user_info['firstname'];
                 }
-                if ($number_decimals == null) {
+                if (null == $number_decimals) {
                     if (empty($data['scoreletter']) && !is_numeric($data['score'])) {
                         $result[] = get_lang('The user did not take the exam.');
                     } else {
@@ -525,7 +523,7 @@ if (isset($_GET['resultdelete'])) {
 
 if (isset($_POST['action'])) {
     $number_of_selected_items = count($_POST['id']);
-    if ($number_of_selected_items == '0') {
+    if ('0' == $number_of_selected_items) {
         Display::addFlash(
             Display::return_message(
                 get_lang('No resource selected'),
@@ -674,7 +672,7 @@ if (isset($_GET['import_score_error'])) {
     );
 }
 
-if ($file_type == null) {
+if (null == $file_type) {
     //show the result header
     if (isset($export_result_form) && !(isset($edit_res_form))) {
         echo $export_result_form->display();
diff --git a/public/main/gradebook/index.php b/public/main/gradebook/index.php
index 60adf33c29..030bcea2d4 100644
--- a/public/main/gradebook/index.php
+++ b/public/main/gradebook/index.php
@@ -229,7 +229,7 @@ if ($selectCat > 0 && $isStudentView) {
 if (isset($_GET['createallcategories'])) {
     GradebookUtils::block_students();
     $coursecat = Category::get_not_created_course_categories($stud_id);
-    if (!count($coursecat) == 0) {
+    if (0 == !count($coursecat)) {
         foreach ($coursecat as $row) {
             $cat = new Category();
             $cat->set_name($row[1]);
@@ -273,7 +273,7 @@ if (isset($_GET['movecat'])) {
         }
     } else {
         $targetcat = Category::load($_GET['targetcat']);
-        $course_to_crsind = ($cats[0]->get_course_code() != null && $targetcat[0]->get_course_code() == null);
+        $course_to_crsind = (null != $cats[0]->get_course_code() && null == $targetcat[0]->get_course_code());
 
         if (!($course_to_crsind && !isset($_GET['confirm']))) {
             $cats[0]->move_to_cat($targetcat[0]);
@@ -307,7 +307,7 @@ if (isset($_GET['moveeval'])) {
         }
     } else {
         $targetcat = Category::load($_GET['targetcat']);
-        $course_to_crsind = $evals[0]->get_course_code() != null && $targetcat[0]->get_course_code() == null;
+        $course_to_crsind = null != $evals[0]->get_course_code() && null == $targetcat[0]->get_course_code();
 
         if (!($course_to_crsind && !isset($_GET['confirm']))) {
             $evals[0]->move_to_cat($targetcat[0]);
@@ -367,8 +367,8 @@ if (isset($_GET['deletecat'])) {
     $cats = Category::load($_GET['deletecat']);
     if (isset($cats[0])) {
         // Delete all categories,subcategories and results
-        if ($cats[0] != null) {
-            if ($cats[0]->get_id() != 0) {
+        if (null != $cats[0]) {
+            if (0 != $cats[0]->get_id()) {
                 // better don't try to delete the root...
                 $cats[0]->delete_all();
             }
@@ -409,7 +409,7 @@ if (isset($_GET['lockedeval'])) {
         $confirmation_message = get_lang('Evaluation has been unlocked');
     }
     $eval = Evaluation::load($locked);
-    if ($eval[0] != null) {
+    if (null != $eval[0]) {
         $eval[0]->lock($type_locked);
     }
 
@@ -419,7 +419,7 @@ if (isset($_GET['lockedeval'])) {
 if (isset($_GET['deleteeval'])) {
     GradebookUtils::block_students();
     $eval = Evaluation::load($_GET['deleteeval']);
-    if ($eval[0] != null) {
+    if (null != $eval[0]) {
         $eval[0]->delete_with_results();
     }
     $confirmation_message = get_lang('Assessment deleted');
@@ -454,7 +454,7 @@ if (isset($_GET['deletelink'])) {
     //fixing #5229
     if (!empty($get_delete_link)) {
         $link = LinkFactory::load($get_delete_link);
-        if ($link[0] != null) {
+        if (null != $link[0]) {
             // Clean forum qualify
             $sql = 'UPDATE '.$tbl_forum_thread.' SET
                         thread_qualify_max = 0,
@@ -501,7 +501,7 @@ if (isset($_POST['action'])) {
     GradebookUtils::block_students();
     $number_of_selected_items = count($_POST['id']);
 
-    if ($number_of_selected_items == 0) {
+    if (0 == $number_of_selected_items) {
         $warning_message = get_lang('No resource selected');
         $filter_warning_msg = false;
     } else {
@@ -511,27 +511,27 @@ if (isset($_POST['action'])) {
                 $number_of_deleted_evaluations = 0;
                 $number_of_deleted_links = 0;
                 foreach ($_POST['id'] as $indexstr) {
-                    if (substr($indexstr, 0, 4) == 'CATE') {
+                    if ('CATE' == substr($indexstr, 0, 4)) {
                         $cats = Category::load(substr($indexstr, 4));
-                        if ($cats[0] != null) {
+                        if (null != $cats[0]) {
                             $cats[0]->delete_all();
                         }
                         $number_of_deleted_categories++;
                     }
-                    if (substr($indexstr, 0, 4) == 'EVAL') {
+                    if ('EVAL' == substr($indexstr, 0, 4)) {
                         $eval = Evaluation::load(substr($indexstr, 4));
-                        if ($eval[0] != null) {
+                        if (null != $eval[0]) {
                             $eval[0]->delete_with_results();
                         }
 
                         $number_of_deleted_evaluations++;
                     }
-                    if (substr($indexstr, 0, 4) == 'LINK') {
+                    if ('LINK' == substr($indexstr, 0, 4)) {
                         //fixing #5229
                         $id = substr($indexstr, 4);
                         if (!empty($id)) {
                             $link = LinkFactory::load($id);
-                            if ($link[0] != null) {
+                            if (null != $link[0]) {
                                 $link[0]->delete();
                             }
                             $number_of_deleted_links++;
@@ -548,18 +548,18 @@ if (isset($_POST['action'])) {
                 break;
             case 'setvisible':
                 foreach ($_POST['id'] as $indexstr) {
-                    if (substr($indexstr, 0, 4) == 'CATE') {
+                    if ('CATE' == substr($indexstr, 0, 4)) {
                         $cats = Category::load(substr($indexstr, 4));
                         $cats[0]->set_visible(1);
                         $cats[0]->save();
                         $cats[0]->apply_visibility_to_children();
                     }
-                    if (substr($indexstr, 0, 4) == 'EVAL') {
+                    if ('EVAL' == substr($indexstr, 0, 4)) {
                         $eval = Evaluation::load(substr($indexstr, 4));
                         $eval[0]->set_visible(1);
                         $eval[0]->save();
                     }
-                    if (substr($indexstr, 0, 4) == 'LINK') {
+                    if ('LINK' == substr($indexstr, 0, 4)) {
                         $link = LinkFactory::load(substr($indexstr, 4));
                         $link[0]->set_visible(1);
                         $link[0]->save();
@@ -570,18 +570,18 @@ if (isset($_POST['action'])) {
                 break;
             case 'setinvisible':
                 foreach ($_POST['id'] as $indexstr) {
-                    if (substr($indexstr, 0, 4) == 'CATE') {
+                    if ('CATE' == substr($indexstr, 0, 4)) {
                         $cats = Category::load(substr($indexstr, 4));
                         $cats[0]->set_visible(0);
                         $cats[0]->save();
                         $cats[0]->apply_visibility_to_children();
                     }
-                    if (substr($indexstr, 0, 4) == 'EVAL') {
+                    if ('EVAL' == substr($indexstr, 0, 4)) {
                         $eval = Evaluation::load(substr($indexstr, 4));
                         $eval[0]->set_visible(0);
                         $eval[0]->save();
                     }
-                    if (substr($indexstr, 0, 4) == 'LINK') {
+                    if ('LINK' == substr($indexstr, 0, 4)) {
                         $link = LinkFactory::load(substr($indexstr, 4));
                         $link[0]->set_visible(0);
                         $link[0]->save();
@@ -807,7 +807,7 @@ if (!empty($selectCat)) {
     $cat = new Category();
     $course_id = CourseManager::get_course_by_category($selectCat);
     $show_message = $cat->show_message_resource_delete($course_id);
-    if ($show_message == '') {
+    if ('' == $show_message) {
         // Student
         if (!api_is_allowed_to_edit() && !api_is_excluded_user_type()) {
             $certificate = Category::generateUserCertificate(
@@ -815,7 +815,7 @@ if (!empty($selectCat)) {
                 $stud_id
             );
 
-            if ($hideCertificateExport !== 'true' && isset($certificate['pdf_url'])) {
+            if ('true' !== $hideCertificateExport && isset($certificate['pdf_url'])) {
                 $actionsLeft .= Display::url(
                     Display::returnFontAwesomeIcon('file-pdf-o').get_lang('Download certificate in PDF'),
                     $certificate['pdf_url'],
@@ -834,7 +834,7 @@ if (!empty($selectCat)) {
 }
 
 if (!api_is_allowed_to_edit(null, true)) {
-    $allowButton = api_get_configuration_value('gradebook_hide_pdf_report_button') === false;
+    $allowButton = false === api_get_configuration_value('gradebook_hide_pdf_report_button');
     if ($allowButton) {
         $actionsLeft .= Display::url(
             Display::returnFontAwesomeIcon('file-pdf-o').get_lang('Download report in PDF'),
@@ -844,7 +844,7 @@ if (!api_is_allowed_to_edit(null, true)) {
     }
 }
 
-if (isset($first_time) && $first_time == 1 && api_is_allowed_to_edit(null, true)) {
+if (isset($first_time) && 1 == $first_time && api_is_allowed_to_edit(null, true)) {
     echo '<meta http-equiv="refresh" content="0;url='.api_get_self().'?'.api_get_cidreq().'" />';
 } else {
     // Tool introduction
@@ -871,11 +871,11 @@ if (isset($first_time) && $first_time == 1 && api_is_allowed_to_edit(null, true)
     );
 
     if (!empty($cats)) {
-        if ((api_get_setting('gradebook_enable_grade_model') === 'true') &&
+        if (('true' === api_get_setting('gradebook_enable_grade_model')) &&
             (
                 api_is_platform_admin() || (
                     api_is_allowed_to_edit(null, true) &&
-                    api_get_setting('teachers_can_change_grade_model_settings') === 'true'
+                    'true' === api_get_setting('teachers_can_change_grade_model_settings')
                 )
             )
         ) {
@@ -884,8 +884,8 @@ if (isset($first_time) && $first_time == 1 && api_is_allowed_to_edit(null, true)
             $grade_models = $obj->get_all();
             $grade_model_id = $cats[0]->get_grade_model_id();
             // No children.
-            if ((count($cats) == 1 && empty($grade_model_id)) ||
-                (count($cats) == 1 && $grade_model_id != -1)
+            if ((1 == count($cats) && empty($grade_model_id)) ||
+                (1 == count($cats) && -1 != $grade_model_id)
             ) {
                 if (!empty($grade_models)) {
                     $form_grade = new FormValidator('grade_model_settings');
@@ -937,7 +937,7 @@ if (isset($first_time) && $first_time == 1 && api_is_allowed_to_edit(null, true)
         $i = 0;
         $allcat = [];
         $model = ExerciseLib::getCourseScoreModel();
-        $allowGraph = api_get_configuration_value('gradebook_hide_graph') === false;
+        $allowGraph = false === api_get_configuration_value('gradebook_hide_graph');
         $isAllow = api_is_allowed_to_edit(null, true);
 
         /** @var Category $cat */
@@ -946,7 +946,7 @@ if (isset($first_time) && $first_time == 1 && api_is_allowed_to_edit(null, true)
             $alleval = $cat->get_evaluations($stud_id, false, $course_code, $session_id);
             $alllink = $cat->get_links($stud_id, true, $course_code, $session_id);
 
-            if ($cat->get_parent_id() != 0) {
+            if (0 != $cat->get_parent_id()) {
                 $i++;
             } else {
                 // This is the father
@@ -963,7 +963,7 @@ if (isset($first_time) && $first_time == 1 && api_is_allowed_to_edit(null, true)
                     $certificate
                 );
 
-                if ($isAllow && api_get_setting('gradebook_enable_grade_model') === 'true') {
+                if ($isAllow && 'true' === api_get_setting('gradebook_enable_grade_model')) {
                     // Showing the grading system
                     if (!empty($grade_models[$grade_model_id])) {
                         echo Display::return_message(
@@ -973,16 +973,16 @@ if (isset($first_time) && $first_time == 1 && api_is_allowed_to_edit(null, true)
                 }
 
                 $exportToPdf = false;
-                if ($action === 'export_table') {
+                if ('export_table' === $action) {
                     $exportToPdf = true;
                 }
 
                 $loadStats = [];
                 if (!$isAllow) {
-                    if (api_get_setting('gradebook_detailed_admin_view') === 'true') {
+                    if ('true' === api_get_setting('gradebook_detailed_admin_view')) {
                         $loadStats = [1, 2, 3];
                     } else {
-                        if (api_get_configuration_value('gradebook_enable_best_score') !== false) {
+                        if (false !== api_get_configuration_value('gradebook_enable_best_score')) {
                             $loadStats = [2];
                         }
                     }
@@ -1014,7 +1014,7 @@ if (isset($first_time) && $first_time == 1 && api_is_allowed_to_edit(null, true)
                     $graph = $gradebookTable->getGraph();
                 }
 
-                if ($action === 'export_table') {
+                if ('export_table' === $action) {
                     ob_clean();
                     $params = [
                         'pdf_title' => sprintf(get_lang('Grades from course: %s'), $courseInfo['name']),
diff --git a/public/main/gradebook/lib/GradebookUtils.php b/public/main/gradebook/lib/GradebookUtils.php
index 9c4d1913a5..739b23bedb 100644
--- a/public/main/gradebook/lib/GradebookUtils.php
+++ b/public/main/gradebook/lib/GradebookUtils.php
@@ -130,7 +130,7 @@ class GradebookUtils
             }
         } else {
             $isCoach = api_is_coach(api_get_session_id(), api_get_course_int_id());
-            if ($isCoach === false) {
+            if (false === $isCoach) {
                 if (!api_is_allowed_to_edit()) {
                     api_not_allowed();
                 }
@@ -224,9 +224,9 @@ class GradebookUtils
         $selectcat = $selectcat->get_id();
         $modify_icons = null;
 
-        if ($show_message === false) {
-            $visibility_icon = ($cat->is_visible() == 0) ? 'invisible' : 'visible';
-            $visibility_command = ($cat->is_visible() == 0) ? 'set_visible' : 'set_invisible';
+        if (false === $show_message) {
+            $visibility_icon = (0 == $cat->is_visible()) ? 'invisible' : 'visible';
+            $visibility_command = (0 == $cat->is_visible()) ? 'set_visible' : 'set_invisible';
 
             $modify_icons .= '<a class="view_children" data-cat-id="'.$cat->get_id().'" href="javascript:void(0);">'.
                 Display::return_icon(
@@ -262,7 +262,7 @@ class GradebookUtils
 
             if (api_is_allowed_to_edit(null, true)) {
                 // Locking button
-                if (api_get_setting('gradebook_locking_enabled') == 'true') {
+                if ('true' == api_get_setting('gradebook_locking_enabled')) {
                     if ($cat->is_locked()) {
                         if (api_is_platform_admin()) {
                             $modify_icons .= '&nbsp;<a onclick="javascript:if (!confirm(\''.addslashes(get_lang('Are you sure you want to unlock this element?')).'\')) return false;" href="'.api_get_self().'?'.api_get_cidreq().'&category_id='.$cat->get_id().'&action=unlock">'.
@@ -280,7 +280,7 @@ class GradebookUtils
                     }
                 }
 
-                if (empty($grade_model_id) || $grade_model_id == -1) {
+                if (empty($grade_model_id) || -1 == $grade_model_id) {
                     if ($cat->is_locked() && !api_is_platform_admin()) {
                         $modify_icons .= Display::return_icon(
                             'edit_na.png',
@@ -361,9 +361,9 @@ class GradebookUtils
         $message_eval = $cat->show_message_resource_delete($eval->get_course_code());
         $courseParams = api_get_cidreq_params($eval->get_course_code(), $eval->getSessionId());
 
-        if ($message_eval === false && api_is_allowed_to_edit(null, true)) {
-            $visibility_icon = $eval->is_visible() == 0 ? 'invisible' : 'visible';
-            $visibility_command = $eval->is_visible() == 0 ? 'set_visible' : 'set_invisible';
+        if (false === $message_eval && api_is_allowed_to_edit(null, true)) {
+            $visibility_icon = 0 == $eval->is_visible() ? 'invisible' : 'visible';
+            $visibility_command = 0 == $eval->is_visible() ? 'set_visible' : 'set_invisible';
             if ($is_locked && !api_is_platform_admin()) {
                 $modify_icons = Display::return_icon(
                     'edit_na.png',
@@ -458,9 +458,9 @@ class GradebookUtils
             $link->get_session_id()
         );
 
-        if ($message_link === false) {
-            $visibility_icon = $link->is_visible() == 0 ? 'invisible' : 'visible';
-            $visibility_command = $link->is_visible() == 0 ? 'set_visible' : 'set_invisible';
+        if (false === $message_link) {
+            $visibility_icon = 0 == $link->is_visible() ? 'invisible' : 'visible';
+            $visibility_command = 0 == $link->is_visible() ? 'set_visible' : 'set_invisible';
 
             if ($is_locked && !api_is_platform_admin()) {
                 $modify_icons = Display::return_icon(
@@ -498,7 +498,7 @@ class GradebookUtils
                 '</a>';
 
             $allowStats = api_get_configuration_value('allow_gradebook_stats');
-            if ($allowStats && $link->get_type() == LINK_EXERCISE) {
+            if ($allowStats && LINK_EXERCISE == $link->get_type()) {
                 $modify_icons .= Display::url(
                     Display::return_icon('reload.png', get_lang('Generate statistics')),
                     api_get_self().'?itemId='.$link->get_id().'&action=generate_link_stats&selectcat='.$selectcat.'&'.$courseParams
@@ -697,7 +697,7 @@ class GradebookUtils
                 WHERE gc.cat_id = $cat_id AND user_id = $user_id ";
         $rs_exist = Database::query($sql);
         $row = Database::fetch_array($rs_exist);
-        if ($row['count'] == 0) {
+        if (0 == $row['count']) {
             $params = [
                 'cat_id' => $cat_id,
                 'user_id' => $user_id,
@@ -987,7 +987,7 @@ class GradebookUtils
                 if ($my_cat->get_course_code() == api_get_course_id()) {
                     $grade_model_id = $my_cat->get_grade_model_id();
                     if (empty($grade_model_id)) {
-                        if ($my_cat->get_parent_id() == 0) {
+                        if (0 == $my_cat->get_parent_id()) {
                             //$default_weight = $my_cat->get_weight();
                             $select_gradebook->addoption(get_lang('Default'), $my_cat->get_id());
                             $cats_added[] = $my_cat->get_id();
@@ -1052,7 +1052,7 @@ class GradebookUtils
 
         $parent_id = $cat[0]->get_parent_id();
         if (isset($cat[0]) && isset($parent_id)) {
-            if ($parent_id == 0) {
+            if (0 == $parent_id) {
                 $grade_model_id = $cat[0]->get_grade_model_id();
             } else {
                 $parent_cat = Category::load($parent_id);
@@ -1061,18 +1061,18 @@ class GradebookUtils
         }
 
         $use_grade_model = true;
-        if (empty($grade_model_id) || $grade_model_id == -1) {
+        if (empty($grade_model_id) || -1 == $grade_model_id) {
             $use_grade_model = false;
         }
 
         if ($use_grade_model) {
-            if ($parent_id == 0) {
+            if (0 == $parent_id) {
                 $title = api_strtoupper(get_lang('Average')).'<br />'.get_lang('Detailed');
             } else {
                 $title = api_strtoupper(get_lang('Average')).'<br />'.$cat[0]->get_description().' - ('.$cat[0]->get_name().')';
             }
         } else {
-            if ($parent_id == 0) {
+            if (0 == $parent_id) {
                 $title = api_strtoupper(get_lang('Average')).'<br />'.get_lang('Detailed');
             } else {
                 $title = api_strtoupper(get_lang('Average'));
@@ -1110,10 +1110,10 @@ class GradebookUtils
                     $attributes['align'] = 'center';
                     $attributes['style'] = null;
 
-                    if ($key === 'name') {
+                    if ('name' === $key) {
                         $attributes['align'] = 'left';
                     }
-                    if ($key === 'total') {
+                    if ('total' === $key) {
                         $attributes['style'] = 'font-weight:bold';
                     }
                     $table->setCellContents($row, $column, $printable_data_cell);
@@ -1136,7 +1136,7 @@ class GradebookUtils
             'add_signatures' => ['Drh', 'Teacher', 'Date'],
         ];
 
-        $page_format = $params['orientation'] === 'landscape' ? 'A4-L' : 'A4';
+        $page_format = 'landscape' === $params['orientation'] ? 'A4-L' : 'A4';
         ob_start();
         $pdf = new PDF($page_format, $page_format, $pdfParams);
         $pdf->html_to_pdf_with_template($flatviewtable->return_table(), false, false, true);
@@ -1157,7 +1157,7 @@ class GradebookUtils
         $badges = [];
         foreach ($list_values as $value) {
             $class = 'warning';
-            if ($counter == 1) {
+            if (1 == $counter) {
                 $class = 'success';
             }
             $counter++;
@@ -1604,10 +1604,10 @@ class GradebookUtils
         $alllink = $cats[0]->get_links($userId);
 
         $loadStats = [];
-        if (api_get_setting('gradebook_detailed_admin_view') === 'true') {
+        if ('true' === api_get_setting('gradebook_detailed_admin_view')) {
             $loadStats = [1, 2, 3];
         } else {
-            if (api_get_configuration_value('gradebook_enable_best_score') !== false) {
+            if (false !== api_get_configuration_value('gradebook_enable_best_score')) {
                 $loadStats = [2];
             }
         }
diff --git a/public/main/gradebook/lib/be/abstractlink.class.php b/public/main/gradebook/lib/be/abstractlink.class.php
index 99ca925583..ed9c7bc36b 100644
--- a/public/main/gradebook/lib/be/abstractlink.class.php
+++ b/public/main/gradebook/lib/be/abstractlink.class.php
@@ -12,8 +12,6 @@ use Chamilo\CoreBundle\Entity\GradebookLink;
  *
  * @author Bert Steppé
  * @author Julio Montoya <gugli100@gmail.com> security improvements
- *
- * @package chamilo.gradebook
  */
 abstract class AbstractLink implements GradebookItem
 {
@@ -176,7 +174,7 @@ abstract class AbstractLink implements GradebookItem
 
     public function is_locked()
     {
-        return isset($this->locked) && $this->locked == 1 ? true : false;
+        return isset($this->locked) && 1 == $this->locked ? true : false;
     }
 
     public function is_visible()
@@ -306,7 +304,7 @@ abstract class AbstractLink implements GradebookItem
             $paramcount++;
         }
         if (isset($type)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -315,7 +313,7 @@ abstract class AbstractLink implements GradebookItem
             $paramcount++;
         }
         if (isset($ref_id)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -324,7 +322,7 @@ abstract class AbstractLink implements GradebookItem
             $paramcount++;
         }
         if (isset($user_id)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -333,7 +331,7 @@ abstract class AbstractLink implements GradebookItem
             $paramcount++;
         }
         if (isset($course_code)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -345,7 +343,7 @@ abstract class AbstractLink implements GradebookItem
             }
         }
         if (isset($category_id)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -354,7 +352,7 @@ abstract class AbstractLink implements GradebookItem
             $paramcount++;
         }
         if (isset($visible)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -393,7 +391,7 @@ abstract class AbstractLink implements GradebookItem
             $result = Database::query($sql);
             $row = Database::fetch_array($result, 'ASSOC');
 
-            if ($row['count'] == 0) {
+            if (0 == $row['count']) {
                 $em = Database::getManager();
                 $link = new GradebookLink();
                 $link
@@ -551,7 +549,7 @@ abstract class AbstractLink implements GradebookItem
         $links = $rootcat[0]->get_links((api_is_allowed_to_edit() ? null : api_get_user_id()), true);
         $foundlinks = [];
         foreach ($links as $link) {
-            if (!(api_strpos(api_strtolower($link->get_name()), api_strtolower($name_mask)) === false)) {
+            if (!(false === api_strpos(api_strtolower($link->get_name()), api_strtolower($name_mask)))) {
                 $foundlinks[] = $link;
             }
         }
@@ -658,7 +656,7 @@ abstract class AbstractLink implements GradebookItem
             }
 
             // If no ranking was detected.
-            if ($ranking == 0) {
+            if (0 == $ranking) {
                 return [];
             }
 
diff --git a/public/main/gradebook/lib/be/attendancelink.class.php b/public/main/gradebook/lib/be/attendancelink.class.php
index 5f811f2846..e1c9045ef3 100644
--- a/public/main/gradebook/lib/be/attendancelink.class.php
+++ b/public/main/gradebook/lib/be/attendancelink.class.php
@@ -5,8 +5,6 @@
  * Gradebook link to attendance item.
  *
  * @author Christian Fasanando (christian1827@gmail.com)
- *
- * @package chamilo.gradebook
  */
 class AttendanceLink extends AbstractLink
 {
@@ -61,7 +59,7 @@ class AttendanceLink extends AbstractLink
         $result = Database::query($sql);
 
         while ($data = Database::fetch_array($result)) {
-            if (isset($data['attendance_qualify_title']) && $data['attendance_qualify_title'] != '') {
+            if (isset($data['attendance_qualify_title']) && '' != $data['attendance_qualify_title']) {
                 $cats[] = [$data['id'], $data['attendance_qualify_title']];
             } else {
                 $cats[] = [$data['id'], $data['name']];
@@ -88,7 +86,7 @@ class AttendanceLink extends AbstractLink
         $result = Database::query($sql);
         $number = Database::fetch_row($result);
 
-        return $number[0] != 0;
+        return 0 != $number[0];
     }
 
     /**
@@ -141,7 +139,7 @@ class AttendanceLink extends AbstractLink
 
             while ($data = Database::fetch_array($scores)) {
                 if (!(array_key_exists($data['user_id'], $students))) {
-                    if ($attendance['attendance_qualify_max'] != 0) {
+                    if (0 != $attendance['attendance_qualify_max']) {
                         $students[$data['user_id']] = $data['score'];
                         $rescount++;
                         $sum += $data['score'] / $attendance['attendance_qualify_max'];
@@ -154,7 +152,7 @@ class AttendanceLink extends AbstractLink
                 }
             }
 
-            if ($rescount == 0) {
+            if (0 == $rescount) {
                 return [null, null];
             } else {
                 switch ($type) {
@@ -198,7 +196,7 @@ class AttendanceLink extends AbstractLink
         $this->get_attendance_data();
         $attendance_title = isset($this->attendance_data['name']) ? $this->attendance_data['name'] : '';
         $attendance_qualify_title = isset($this->attendance_data['attendance_qualify_title']) ? $this->attendance_data['attendance_qualify_title'] : '';
-        if (isset($attendance_qualify_title) && $attendance_qualify_title != '') {
+        if (isset($attendance_qualify_title) && '' != $attendance_qualify_title) {
             return $this->attendance_data['attendance_qualify_title'];
         } else {
             return $attendance_title;
@@ -223,7 +221,7 @@ class AttendanceLink extends AbstractLink
         $result = Database::query($sql);
         $number = Database::fetch_row($result);
 
-        return $number[0] != 0;
+        return 0 != $number[0];
     }
 
     public function get_link()
@@ -264,7 +262,7 @@ class AttendanceLink extends AbstractLink
     private function get_attendance_data()
     {
         $tbl_name = $this->get_attendance_table();
-        if ($tbl_name == '') {
+        if ('' == $tbl_name) {
             return false;
         } elseif (!isset($this->attendance_data)) {
             $sql = 'SELECT * FROM '.$this->get_attendance_table().' att
diff --git a/public/main/gradebook/lib/be/category.class.php b/public/main/gradebook/lib/be/category.class.php
index d2ce253002..31f41896f4 100644
--- a/public/main/gradebook/lib/be/category.class.php
+++ b/public/main/gradebook/lib/be/category.class.php
@@ -7,8 +7,6 @@ use ChamiloSession as Session;
 /**
  * Class Category
  * Defines a gradebook Category object.
- *
- * @package chamilo.gradebook
  */
 class Category implements GradebookItem
 {
@@ -136,7 +134,7 @@ class Category implements GradebookItem
      */
     public function is_locked()
     {
-        return isset($this->locked) && $this->locked == 1 ? true : false;
+        return isset($this->locked) && 1 == $this->locked ? true : false;
     }
 
     /**
@@ -386,7 +384,7 @@ class Category implements GradebookItem
         $id = null,
         $session_id = null
     ) {
-        if (isset($id) && (int) $id === 0) {
+        if (isset($id) && 0 === (int) $id) {
             $cats = [];
             $cats[] = self::create_root_category();
 
@@ -443,7 +441,7 @@ class Category implements GradebookItem
     ) {
         //if the category given is explicitly 0 (not null), then create
         // a root category object (in memory)
-        if (isset($id) && (int) $id === 0) {
+        if (isset($id) && 0 === (int) $id) {
             $cats = [];
             $cats[] = self::create_root_category();
 
@@ -460,7 +458,7 @@ class Category implements GradebookItem
 
         if (isset($user_id)) {
             $user_id = intval($user_id);
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -470,13 +468,13 @@ class Category implements GradebookItem
         }
 
         if (isset($course_code)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
             }
 
-            if ($course_code == '0') {
+            if ('0' == $course_code) {
                 $sql .= ' c_id is null ';
             } else {
                 $courseInfo = api_get_course_info($course_code);
@@ -501,7 +499,7 @@ class Category implements GradebookItem
         }
 
         if (isset($parent_id)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND ';
             } else {
                 $sql .= ' WHERE ';
@@ -511,7 +509,7 @@ class Category implements GradebookItem
         }
 
         if (isset($visible)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -520,7 +518,7 @@ class Category implements GradebookItem
         }
 
         if (!empty($order_by)) {
-            if (!empty($order_by) && $order_by != '') {
+            if (!empty($order_by) && '' != $order_by) {
                 $sql .= ' '.$order_by;
             }
         }
@@ -601,11 +599,11 @@ class Category implements GradebookItem
             if (!empty($id)) {
                 $parent_id = $this->get_parent_id();
                 $grade_model_id = $this->get_grade_model_id();
-                if ($parent_id == 0) {
+                if (0 == $parent_id) {
                     //do something
                     if (isset($grade_model_id) &&
                         !empty($grade_model_id) &&
-                        $grade_model_id != '-1'
+                        '-1' != $grade_model_id
                     ) {
                         $obj = new GradeModel();
                         $components = $obj->get_components($grade_model_id);
@@ -683,10 +681,10 @@ class Category implements GradebookItem
         if (!empty($this->id)) {
             $parent_id = $this->get_parent_id();
             $grade_model_id = $this->get_grade_model_id();
-            if ($parent_id == 0) {
+            if (0 == $parent_id) {
                 if (isset($grade_model_id) &&
                     !empty($grade_model_id) &&
-                    $grade_model_id != '-1'
+                    '-1' != $grade_model_id
                 ) {
                     $obj = new GradeModel();
                     $components = $obj->get_components($grade_model_id);
@@ -870,7 +868,7 @@ class Category implements GradebookItem
     public function is_course()
     {
         return isset($this->course_code) && !empty($this->course_code)
-            && (!isset($this->parent) || $this->parent == 0);
+            && (!isset($this->parent) || 0 == $this->parent);
     }
 
     /**
@@ -901,7 +899,7 @@ class Category implements GradebookItem
             }
         }
         // Classic
-        if (!empty($stud_id) && $type == '') {
+        if (!empty($stud_id) && '' == $type) {
             if (!empty($course_code)) {
                 $cats = $this->get_subcategories(
                     $stud_id,
@@ -935,7 +933,7 @@ class Category implements GradebookItem
                     );
 
                     $catweight = 0;
-                    if ($cat->get_weight() != 0) {
+                    if (0 != $cat->get_weight()) {
                         $catweight = $cat->get_weight();
                         $weightsum += $catweight;
                     }
@@ -951,14 +949,14 @@ class Category implements GradebookItem
                 foreach ($evals as $eval) {
                     $eval->setStudentList($this->getStudentList());
                     $evalres = $eval->calc_score($stud_id);
-                    if (isset($evalres) && $eval->get_weight() != 0) {
+                    if (isset($evalres) && 0 != $eval->get_weight()) {
                         $evalweight = $eval->get_weight();
                         $weightsum += $evalweight;
                         if (!empty($evalres[1])) {
                             $ressum += $evalres[0] / $evalres[1] * $evalweight;
                         }
                     } else {
-                        if ($eval->get_weight() != 0) {
+                        if (0 != $eval->get_weight()) {
                             $evalweight = $eval->get_weight();
                             $weightsum += $evalweight;
                         }
@@ -976,14 +974,14 @@ class Category implements GradebookItem
                     }
 
                     $linkres = $link->calc_score($stud_id, null);
-                    if (!empty($linkres) && $link->get_weight() != 0) {
+                    if (!empty($linkres) && 0 != $link->get_weight()) {
                         $linkweight = $link->get_weight();
-                        $link_res_denom = $linkres[1] == 0 ? 1 : $linkres[1];
+                        $link_res_denom = 0 == $linkres[1] ? 1 : $linkres[1];
                         $weightsum += $linkweight;
                         $ressum += $linkres[0] / $link_res_denom * $linkweight;
                     } else {
                         // Adding if result does not exists
-                        if ($link->get_weight() != 0) {
+                        if (0 != $link->get_weight()) {
                             $linkweight = $link->get_weight();
                             $weightsum += $linkweight;
                         }
@@ -1023,7 +1021,7 @@ class Category implements GradebookItem
                     );
 
                     $catweight = 0;
-                    if ($cat->get_weight() != 0) {
+                    if (0 != $cat->get_weight()) {
                         $catweight = $cat->get_weight();
                         $weightsum += $catweight;
                     }
@@ -1039,14 +1037,14 @@ class Category implements GradebookItem
             }
 
             if (!empty($evals)) {
-                if ($type === 'best') {
+                if ('best' === $type) {
                     $studentList = $this->getStudentList();
                     foreach ($studentList as $student) {
                         $studentId = $student['user_id'];
                         foreach ($evals as $eval) {
                             $linkres = $eval->calc_score($studentId, null);
                             $linkweight = $eval->get_weight();
-                            $link_res_denom = $linkres[1] == 0 ? 1 : $linkres[1];
+                            $link_res_denom = 0 == $linkres[1] ? 1 : $linkres[1];
                             $ressum = $linkres[0] / $link_res_denom * $linkweight;
 
                             if (!isset($totalScorePerStudent[$studentId])) {
@@ -1061,7 +1059,7 @@ class Category implements GradebookItem
                         $evalres = $eval->calc_score(null, $type);
                         $eval->setStudentList($this->getStudentList());
 
-                        if (isset($evalres) && $eval->get_weight() != 0) {
+                        if (isset($evalres) && 0 != $eval->get_weight()) {
                             $evalweight = $eval->get_weight();
                             $weightsum += $evalweight;
                             if (!empty($evalres[1])) {
@@ -1072,7 +1070,7 @@ class Category implements GradebookItem
                                 $bestResult = $ressum;
                             }
                         } else {
-                            if ($eval->get_weight() != 0) {
+                            if (0 != $eval->get_weight()) {
                                 $evalweight = $eval->get_weight();
                                 $weightsum += $evalweight;
                             }
@@ -1083,13 +1081,13 @@ class Category implements GradebookItem
 
             if (!empty($links)) {
                 $studentList = $this->getStudentList();
-                if ($type === 'best') {
+                if ('best' === $type) {
                     foreach ($studentList as $student) {
                         $studentId = $student['user_id'];
                         foreach ($links as $link) {
                             $linkres = $link->calc_score($studentId, null);
                             $linkweight = $link->get_weight();
-                            $link_res_denom = $linkres[1] == 0 ? 1 : $linkres[1];
+                            $link_res_denom = 0 == $linkres[1] ? 1 : $linkres[1];
                             $ressum = $linkres[0] / $link_res_denom * $linkweight;
 
                             if (!isset($totalScorePerStudent[$studentId])) {
@@ -1109,9 +1107,9 @@ class Category implements GradebookItem
 
                         $linkres = $link->calc_score($stud_id, $type);
 
-                        if (!empty($linkres) && $link->get_weight() != 0) {
+                        if (!empty($linkres) && 0 != $link->get_weight()) {
                             $linkweight = $link->get_weight();
-                            $link_res_denom = $linkres[1] == 0 ? 1 : $linkres[1];
+                            $link_res_denom = 0 == $linkres[1] ? 1 : $linkres[1];
 
                             $weightsum += $linkweight;
                             $ressum += $linkres[0] / $link_res_denom * $linkweight;
@@ -1120,7 +1118,7 @@ class Category implements GradebookItem
                             }
                         } else {
                             // Adding if result does not exists
-                            if ($link->get_weight() != 0) {
+                            if (0 != $link->get_weight()) {
                                 $linkweight = $link->get_weight();
                                 $weightsum += $linkweight;
                             }
@@ -1290,7 +1288,7 @@ class Category implements GradebookItem
                     )';
             }
         } elseif (api_is_platform_admin()) {
-            if (isset($session_id) && $session_id != 0) {
+            if (isset($session_id) && 0 != $session_id) {
                 $sql .= ' AND session_id='.$session_id;
             } else {
                 $sql .= ' AND coalesce(session_id,0)=0';
@@ -1325,7 +1323,7 @@ class Category implements GradebookItem
         $course_code = null,
         $session_id = null
     ) {
-        if ($user_id == null) {
+        if (null == $user_id) {
             return self::load(null, null, $course_code, 0, null, $session_id);
         }
 
@@ -1376,7 +1374,7 @@ class Category implements GradebookItem
      */
     public function is_movable()
     {
-        return !(!isset($this->id) || $this->id == 0 || $this->is_course());
+        return !(!isset($this->id) || 0 == $this->id || $this->is_course());
     }
 
     /**
@@ -1621,7 +1619,7 @@ class Category implements GradebookItem
             $this->id,
             $studentId
         );
-        if (count($evals) != 0) {
+        if (0 != count($evals)) {
             return true;
         } else {
             $cats = self::load(
@@ -1709,7 +1707,7 @@ class Category implements GradebookItem
         // 1 student
         if (isset($studentId)) {
             // Special case: this is the root
-            if ($this->id == 0) {
+            if (0 == $this->id) {
                 return $this->get_root_categories_for_student($studentId, $course_code, $session_id);
             } else {
                 return self::load(
@@ -1727,7 +1725,7 @@ class Category implements GradebookItem
             // Course admin
             if (api_is_allowed_to_edit() && !api_is_platform_admin()) {
                 // root
-                if ($this->id == 0) {
+                if (0 == $this->id) {
                     // inside a course
                     return $this->get_root_categories_for_teacher(
                         api_get_user_id(),
@@ -1806,7 +1804,7 @@ class Category implements GradebookItem
         // 1 student
         if (isset($studentId) && !empty($studentId)) {
             // Special case: this is the root
-            if ($this->id == 0) {
+            if (0 == $this->id) {
                 $evals = Evaluation::get_evaluations_with_result_for_student(
                     0,
                     $studentId
@@ -1827,7 +1825,7 @@ class Category implements GradebookItem
                 !api_is_platform_admin()
             ) {
                 // root
-                if ($this->id == 0) {
+                if (0 == $this->id) {
                     $evals = Evaluation::load(
                         null,
                         api_get_user_id(),
@@ -1910,7 +1908,7 @@ class Category implements GradebookItem
         $sessionId = empty($sessionId) ? $this->get_session_id() : $sessionId;
 
         // no links in root or course independent categories
-        if ($this->id == 0) {
+        if (0 == $this->id) {
         } elseif (isset($studentId)) {
             // 1 student $studentId
             $links = LinkFactory::load(
@@ -2020,7 +2018,7 @@ class Category implements GradebookItem
     {
         $categories = [];
         foreach ($allcat as $search_cat) {
-            if (!(strpos(strtolower($search_cat->get_name()), strtolower($name_mask)) === false)) {
+            if (!(false === strpos(strtolower($search_cat->get_name()), strtolower($name_mask)))) {
                 $categories[] = $search_cat;
             }
         }
@@ -2050,7 +2048,7 @@ class Category implements GradebookItem
      */
     public function lockAllItems($locked)
     {
-        if (api_get_setting('gradebook_locking_enabled') == 'true') {
+        if ('true' == api_get_setting('gradebook_locking_enabled')) {
             $this->lock($locked);
             $evals_to_lock = $this->get_evaluations();
             if (!empty($evals_to_lock)) {
@@ -2067,7 +2065,7 @@ class Category implements GradebookItem
             }
 
             $event_type = LOG_GRADEBOOK_UNLOCKED;
-            if ($locked == 1) {
+            if (1 == $locked) {
                 $event_type = LOG_GRADEBOOK_LOCKED;
             }
             Event::addEvent($event_type, LOG_GRADEBOOK_ID, $this->id);
@@ -2202,7 +2200,7 @@ class Category implements GradebookItem
             $fileWasGenerated = $certificate_obj->isHtmlFileGenerated();
 
             // Fix when using custom certificate BT#15937
-            if (api_get_plugin_setting('customcertificate', 'enable_plugin_customcertificate') === 'true') {
+            if ('true' === api_get_plugin_setting('customcertificate', 'enable_plugin_customcertificate')) {
                 $infoCertificate = CustomCertificatePlugin::getCertificateData($my_certificate['id'], $user_id);
                 if (!empty($infoCertificate)) {
                     $fileWasGenerated = true;
@@ -2231,7 +2229,7 @@ class Category implements GradebookItem
 
                 $hideExportLink = api_get_setting('hide_certificate_export_link');
                 $hideExportLinkStudent = api_get_setting('hide_certificate_export_link_students');
-                if ($hideExportLink === 'true' || (api_is_student() && $hideExportLinkStudent === 'true')) {
+                if ('true' === $hideExportLink || (api_is_student() && 'true' === $hideExportLinkStudent)) {
                     $exportToPDF = null;
                 }
 
@@ -2286,7 +2284,7 @@ class Category implements GradebookItem
         $params['right'] = 0;
         $params['top'] = 0;
         $params['bottom'] = 0;
-        $page_format = $params['orientation'] == 'landscape' ? 'A4-L' : 'A4';
+        $page_format = 'landscape' == $params['orientation'] ? 'A4-L' : 'A4';
         $pdf = new PDF($page_format, $params['orientation'], $params);
 
         $certificate_list = GradebookUtils::get_list_users_certificates($catId, $userList);
@@ -2803,7 +2801,7 @@ class Category implements GradebookItem
             $score = $item->calc_score($userId);
             $itemValue = 0;
             if (!empty($score)) {
-                $divider = $score[1] == 0 ? 1 : $score[1];
+                $divider = 0 == $score[1] ? 1 : $score[1];
                 $itemValue = $score[0] / $divider * $item->get_weight();
             }
 
diff --git a/public/main/gradebook/lib/be/dropboxlink.class.php b/public/main/gradebook/lib/be/dropboxlink.class.php
index 8594b87d06..4002ccd80c 100644
--- a/public/main/gradebook/lib/be/dropboxlink.class.php
+++ b/public/main/gradebook/lib/be/dropboxlink.class.php
@@ -5,8 +5,6 @@
  * Gradebook link to dropbox item.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class DropboxLink extends EvalLink
 {
diff --git a/public/main/gradebook/lib/be/evallink.class.php b/public/main/gradebook/lib/be/evallink.class.php
index 4269ff5e16..f4194a1e85 100644
--- a/public/main/gradebook/lib/be/evallink.class.php
+++ b/public/main/gradebook/lib/be/evallink.class.php
@@ -5,9 +5,6 @@
  * Class to be used as basis for links referring to Evaluation objects.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
- * @package chamilo.gradebook
  */
 abstract class EvalLink extends AbstractLink
 {
diff --git a/public/main/gradebook/lib/be/evaluation.class.php b/public/main/gradebook/lib/be/evaluation.class.php
index febbdbc59e..f0cf64be7e 100644
--- a/public/main/gradebook/lib/be/evaluation.class.php
+++ b/public/main/gradebook/lib/be/evaluation.class.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 
 /**
  * Class Evaluation.
- *
- * @package chamilo.gradebook
  */
 class Evaluation implements GradebookItem
 {
@@ -151,7 +149,7 @@ class Evaluation implements GradebookItem
 
     public function is_locked()
     {
-        return isset($this->locked) && $this->locked == 1 ? true : false;
+        return isset($this->locked) && 1 == $this->locked ? true : false;
     }
 
     public function set_id($id)
@@ -238,7 +236,7 @@ class Evaluation implements GradebookItem
         }
 
         if (isset($user_id)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -247,10 +245,10 @@ class Evaluation implements GradebookItem
             $paramcount++;
         }
 
-        if (isset($course_code) && $course_code != '-1') {
+        if (isset($course_code) && '-1' != $course_code) {
             $courseInfo = api_get_course_info($course_code);
             if ($courseInfo) {
-                if ($paramcount != 0) {
+                if (0 != $paramcount) {
                     $sql .= ' AND';
                 } else {
                     $sql .= ' WHERE';
@@ -261,7 +259,7 @@ class Evaluation implements GradebookItem
         }
 
         if (isset($category_id)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -271,7 +269,7 @@ class Evaluation implements GradebookItem
         }
 
         if (isset($visible)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -281,7 +279,7 @@ class Evaluation implements GradebookItem
         }
 
         if (isset($locked)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -457,7 +455,7 @@ class Evaluation implements GradebookItem
         $result = Database::query($sql);
         $number = Database::fetch_row($result);
 
-        return $number[0] != 0;
+        return 0 != $number[0];
     }
 
     /**
@@ -475,7 +473,7 @@ class Evaluation implements GradebookItem
         $result = Database::query($sql);
         $number = Database::fetch_row($result);
 
-        return $number[0] != 0;
+        return 0 != $number[0];
     }
 
     /**
@@ -576,7 +574,7 @@ class Evaluation implements GradebookItem
             $data = Session::read('calc_score');
             $results = isset($data[$key]) ? $data[$key] : null;
 
-            if ($useSession == false) {
+            if (false == $useSession) {
                 $results = null;
             }
             $results = null;
@@ -602,7 +600,7 @@ class Evaluation implements GradebookItem
             $key = 'result_score_student_list_'.api_get_course_int_id().'_'.api_get_session_id().'_'.$this->id;
             $data = Session::read('calc_score');
             $allResults = isset($data[$key]) ? $data[$key] : null;
-            if ($useSession == false) {
+            if (false == $useSession) {
                 $allResults = null;
             }
 
@@ -615,7 +613,7 @@ class Evaluation implements GradebookItem
             /** @var Result $res */
             foreach ($allResults as $res) {
                 $score = $res->get_score();
-                if (!empty($score) || $score == '0') {
+                if (!empty($score) || '0' == $score) {
                     $count++;
                     $sum += $score / $this->get_max();
                     $sumResult += $score;
@@ -789,7 +787,7 @@ class Evaluation implements GradebookItem
         );
         $foundevals = [];
         foreach ($evals as $eval) {
-            if (!(api_strpos(api_strtolower($eval->get_name()), api_strtolower($name_mask)) === false)) {
+            if (!(false === api_strpos(api_strtolower($eval->get_name()), api_strtolower($name_mask)))) {
                 $foundevals[] = $eval;
             }
         }
diff --git a/public/main/gradebook/lib/be/exerciselink.class.php b/public/main/gradebook/lib/be/exerciselink.class.php
index 389f9e32cf..67fcdd05a4 100644
--- a/public/main/gradebook/lib/be/exerciselink.class.php
+++ b/public/main/gradebook/lib/be/exerciselink.class.php
@@ -6,8 +6,6 @@
  * Defines a gradebook ExerciseLink object.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class ExerciseLink extends AbstractLink
 {
@@ -24,7 +22,7 @@ class ExerciseLink extends AbstractLink
         parent::__construct();
         $this->set_type(LINK_EXERCISE);
         $this->is_hp = $hp;
-        if ($this->is_hp == 1) {
+        if (1 == $this->is_hp) {
             $this->set_type(LINK_HOTPOTATOES);
         }
     }
@@ -111,7 +109,7 @@ class ExerciseLink extends AbstractLink
         $result = Database::query($sql);
         $number = Database::fetch_row($result);
 
-        return $number[0] != 0;
+        return 0 != $number[0];
     }
 
     /**
@@ -212,7 +210,7 @@ class ExerciseLink extends AbstractLink
         $exercise->read($exerciseId);
 
         if (!$this->is_hp) {
-            if ($exercise->exercise_was_added_in_lp == false) {
+            if (false == $exercise->exercise_was_added_in_lp) {
                 $sql = "SELECT * FROM $tblStats
                         WHERE
                             exe_exo_id = $exerciseId AND
@@ -240,7 +238,7 @@ class ExerciseLink extends AbstractLink
                             c_id = $courseId ";
             }
 
-            if (!empty($stud_id) && $type != 'ranking') {
+            if (!empty($stud_id) && 'ranking' != $type) {
                 $sql .= " AND exe_user_id = $stud_id ";
             }
             $sql .= ' ORDER BY exe_id DESC';
@@ -306,7 +304,7 @@ class ExerciseLink extends AbstractLink
                 }
 
                 if (!isset($students[$data['exe_user_id']])) {
-                    if ($data['max_score'] != 0) {
+                    if (0 != $data['max_score']) {
                         $students[$data['exe_user_id']] = $data['score'];
                         $student_count++;
                         if ($data['score'] > $bestResult) {
@@ -319,7 +317,7 @@ class ExerciseLink extends AbstractLink
                 }
             }
 
-            if ($student_count == 0) {
+            if (0 == $student_count) {
                 if ($cacheAvailable) {
                     $cacheDriver->save($key, null);
                 }
@@ -437,7 +435,7 @@ class ExerciseLink extends AbstractLink
      */
     public function get_type_name()
     {
-        if ($this->is_hp == 1) {
+        if (1 == $this->is_hp) {
             return 'HotPotatoes';
         }
 
@@ -499,7 +497,7 @@ class ExerciseLink extends AbstractLink
     public function get_exercise_data()
     {
         $tableItemProperty = Database::get_course_table(TABLE_ITEM_PROPERTY);
-        if ($this->is_hp == 1) {
+        if (1 == $this->is_hp) {
             $table = Database::get_course_table(TABLE_DOCUMENT);
         } else {
             $table = Database::get_course_table(TABLE_QUIZ_TEST);
@@ -508,7 +506,7 @@ class ExerciseLink extends AbstractLink
         $exerciseId = $this->get_ref_id();
 
         if (empty($this->exercise_data)) {
-            if ($this->is_hp == 1) {
+            if (1 == $this->is_hp) {
                 $sql = "SELECT * FROM $table ex
                     INNER JOIN $tableItemProperty ip
                     ON (ip.ref = ex.id AND ip.c_id = ex.c_id)
diff --git a/public/main/gradebook/lib/be/forumthreadlink.class.php b/public/main/gradebook/lib/be/forumthreadlink.class.php
index 769dd91284..caa2fea1ce 100644
--- a/public/main/gradebook/lib/be/forumthreadlink.class.php
+++ b/public/main/gradebook/lib/be/forumthreadlink.class.php
@@ -5,8 +5,6 @@
  * Class ForumThreadLink.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class ForumThreadLink extends AbstractLink
 {
@@ -72,7 +70,7 @@ class ForumThreadLink extends AbstractLink
 
         $result = Database::query($sql);
         while ($data = Database::fetch_array($result)) {
-            if (isset($data['thread_title_qualify']) && $data['thread_title_qualify'] != '') {
+            if (isset($data['thread_title_qualify']) && '' != $data['thread_title_qualify']) {
                 $cats[] = [$data['thread_id'], $data['thread_title_qualify']];
             } else {
                 $cats[] = [$data['thread_id'], $data['thread_title']];
@@ -100,7 +98,7 @@ class ForumThreadLink extends AbstractLink
         $result = Database::query($sql);
         $number = Database::fetch_row($result);
 
-        return $number[0] != 0;
+        return 0 != $number[0];
     }
 
     /**
@@ -148,7 +146,7 @@ class ForumThreadLink extends AbstractLink
 
         // for 1 student
         if (isset($stud_id)) {
-            if ($threadInfo['thread_peer_qualify'] == 0) {
+            if (0 == $threadInfo['thread_peer_qualify']) {
                 // Classic way of calculate score
                 if ($data = Database::fetch_array($scores)) {
                     return [
@@ -188,7 +186,7 @@ class ForumThreadLink extends AbstractLink
 
             while ($data = Database::fetch_array($scores)) {
                 if (!(array_key_exists($data['user_id'], $students))) {
-                    if ($assignment['thread_qualify_max'] != 0) {
+                    if (0 != $assignment['thread_qualify_max']) {
                         $students[$data['user_id']] = $data['qualify'];
                         $counter++;
                         $sum += $data['qualify'] / $assignment['thread_qualify_max'];
@@ -201,7 +199,7 @@ class ForumThreadLink extends AbstractLink
                 }
             }
 
-            if ($counter == 0) {
+            if (0 == $counter) {
                 return [null, null];
             } else {
                 switch ($type) {
@@ -245,7 +243,7 @@ class ForumThreadLink extends AbstractLink
         $this->get_exercise_data();
         $thread_title = isset($this->exercise_data['thread_title']) ? $this->exercise_data['thread_title'] : '';
         $thread_title_qualify = isset($this->exercise_data['thread_title_qualify']) ? $this->exercise_data['thread_title_qualify'] : '';
-        if (isset($thread_title_qualify) && $thread_title_qualify != '') {
+        if (isset($thread_title_qualify) && '' != $thread_title_qualify) {
             return $this->exercise_data['thread_title_qualify'];
         }
 
@@ -274,7 +272,7 @@ class ForumThreadLink extends AbstractLink
         $result = Database::query($sql);
         $number = Database::fetch_row($result);
 
-        return $number[0] != 0;
+        return 0 != $number[0];
     }
 
     public function get_link()
diff --git a/public/main/gradebook/lib/be/gradebookitem.class.php b/public/main/gradebook/lib/be/gradebookitem.class.php
index 2929c0199f..4a36789d3a 100644
--- a/public/main/gradebook/lib/be/gradebookitem.class.php
+++ b/public/main/gradebook/lib/be/gradebookitem.class.php
@@ -5,8 +5,6 @@
  * Interface for all displayable items in the gradebook.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 interface GradebookItem
 {
diff --git a/public/main/gradebook/lib/be/learnpathlink.class.php b/public/main/gradebook/lib/be/learnpathlink.class.php
index 1c32840dbe..e6422c3446 100644
--- a/public/main/gradebook/lib/be/learnpathlink.class.php
+++ b/public/main/gradebook/lib/be/learnpathlink.class.php
@@ -6,8 +6,6 @@
  *
  * @author Yannick Warnier <yannick.warnier@beeznest.com>
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class LearnpathLink extends AbstractLink
 {
@@ -65,7 +63,7 @@ class LearnpathLink extends AbstractLink
         $result = Database::query($sql);
         $number = Database::fetch_array($result, 'NUM');
 
-        return $number[0] != 0;
+        return 0 != $number[0];
     }
 
     /**
@@ -128,7 +126,7 @@ class LearnpathLink extends AbstractLink
                 }
             }
 
-            if ($rescount == 0) {
+            if (0 == $rescount) {
                 return [null, null];
             } else {
                 switch ($type) {
@@ -160,7 +158,7 @@ class LearnpathLink extends AbstractLink
                 $session_id
         ).'&gradebook=view';
 
-        if (!api_is_allowed_to_edit() || $this->calc_score(api_get_user_id()) == null) {
+        if (!api_is_allowed_to_edit() || null == $this->calc_score(api_get_user_id())) {
             $url .= '&action=view&lp_id='.$this->get_ref_id();
         } else {
             $url .= '&action=build&lp_id='.$this->get_ref_id();
@@ -199,7 +197,7 @@ class LearnpathLink extends AbstractLink
         $result = Database::query($sql);
         $number = Database::fetch_row($result, 'NUM');
 
-        return $number[0] != 0;
+        return 0 != $number[0];
     }
 
     public function get_type_name()
diff --git a/public/main/gradebook/lib/be/linkfactory.class.php b/public/main/gradebook/lib/be/linkfactory.class.php
index c1fc20d7cb..65bfb25e60 100644
--- a/public/main/gradebook/lib/be/linkfactory.class.php
+++ b/public/main/gradebook/lib/be/linkfactory.class.php
@@ -6,8 +6,6 @@
  * Factory for link objects.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class LinkFactory
 {
diff --git a/public/main/gradebook/lib/be/result.class.php b/public/main/gradebook/lib/be/result.class.php
index b11e7bfefa..4b2deb042e 100644
--- a/public/main/gradebook/lib/be/result.class.php
+++ b/public/main/gradebook/lib/be/result.class.php
@@ -5,8 +5,6 @@
  * Defines a gradebook Result object.
  *
  * @author Bert Steppé, Stijn Konings
- *
- * @package chamilo.gradebook
  */
 class Result
 {
@@ -107,7 +105,7 @@ class Result
             $result = Database::query($sql);
             $existEvaluation = Database::result($result, 0, 0);
 
-            if ($existEvaluation != 0) {
+            if (0 != $existEvaluation) {
                 if ($sessionId) {
                     $sql = 'SELECT c_id, user_id as user_id, status
                             FROM '.$tbl_session_rel_course_user.'
@@ -134,7 +132,7 @@ class Result
                                         evaluation_id="'.intval($evaluation_id).'";';
                     $res_verified = Database::query($sql_verified);
                     $info_verified = Database::result($res_verified, 0, 0);
-                    if ($info_verified == 0) {
+                    if (0 == $info_verified) {
                         $sql_insert = 'INSERT INTO '.$tbl_grade_results.'(user_id,evaluation_id,created_at,score)
 									   VALUES ("'.intval($list_user_course_list[$i]['user_id']).'","'.intval($evaluation_id).'","'.$current_date.'",0);';
                         Database::query($sql_insert);
@@ -164,7 +162,7 @@ class Result
             $paramcount++;
         }
         if (!empty($user_id)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
@@ -173,7 +171,7 @@ class Result
             $paramcount++;
         }
         if (!empty($evaluation_id)) {
-            if ($paramcount != 0) {
+            if (0 != $paramcount) {
                 $sql .= ' AND';
             } else {
                 $sql .= ' WHERE';
diff --git a/public/main/gradebook/lib/be/studentpublicationlink.class.php b/public/main/gradebook/lib/be/studentpublicationlink.class.php
index 375a4b6a2e..695250dc1b 100644
--- a/public/main/gradebook/lib/be/studentpublicationlink.class.php
+++ b/public/main/gradebook/lib/be/studentpublicationlink.class.php
@@ -5,8 +5,6 @@
  * Gradebook link to student publication item.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class StudentPublicationLink extends AbstractLink
 {
@@ -139,7 +137,7 @@ class StudentPublicationLink extends AbstractLink
                 'session' => $session,
             ]);
 
-        return count($results) != 0;
+        return 0 != count($results);
     }
 
     /**
@@ -250,7 +248,7 @@ class StudentPublicationLink extends AbstractLink
 
         foreach ($scores as $data) {
             if (!(array_key_exists($data->getUserId(), $students))) {
-                if ($assignment->getQualification() != 0) {
+                if (0 != $assignment->getQualification()) {
                     $students[$data->getUserId()] = $data->getQualification();
                     $rescount++;
                     $sum += $data->getQualification() / $assignment->getQualification();
@@ -264,7 +262,7 @@ class StudentPublicationLink extends AbstractLink
             }
         }
 
-        if ($rescount == 0) {
+        if (0 == $rescount) {
             return [null, null];
         }
 
@@ -337,7 +335,7 @@ class StudentPublicationLink extends AbstractLink
         $result = Database::query($sql);
         $number = Database::fetch_row($result);
 
-        return $number[0] != 0;
+        return 0 != $number[0];
     }
 
     public function get_icon_name()
diff --git a/public/main/gradebook/lib/be/surveylink.class.php b/public/main/gradebook/lib/be/surveylink.class.php
index d4b4728272..8023b92284 100644
--- a/public/main/gradebook/lib/be/surveylink.class.php
+++ b/public/main/gradebook/lib/be/surveylink.class.php
@@ -5,8 +5,6 @@
  * Gradebook link to a survey item.
  *
  * @author Ivan Tcholakov <ivantcholakov@gmail.com>, 2010
- *
- * @package chamilo.gradebook
  */
 class SurveyLink extends AbstractLink
 {
@@ -125,7 +123,7 @@ class SurveyLink extends AbstractLink
         $sql_result = Database::query($sql);
         $data = Database::fetch_array($sql_result);
 
-        return $data[0] != 0;
+        return 0 != $data[0];
     }
 
     /**
@@ -186,7 +184,7 @@ class SurveyLink extends AbstractLink
             }
             $sum = $sum / $max_score;
 
-            if ($rescount == 0) {
+            if (0 == $rescount) {
                 return [null, null];
             }
 
@@ -223,7 +221,7 @@ class SurveyLink extends AbstractLink
         $result = Database::query($sql);
         $number = Database::fetch_row($result);
 
-        return $number[0] != 0;
+        return 0 != $number[0];
     }
 
     public function get_link()
@@ -238,7 +236,7 @@ class SurveyLink extends AbstractLink
             $sessionId = $this->get_session_id();
             $courseId = $this->getCourseId();
 
-            if ($tbl_name != '') {
+            if ('' != $tbl_name) {
                 $sql = 'SELECT survey_id 
                         FROM '.$this->get_survey_table().'
                         WHERE
@@ -285,7 +283,7 @@ class SurveyLink extends AbstractLink
     {
         $tbl_name = $this->get_survey_table();
 
-        if ($tbl_name == '') {
+        if ('' == $tbl_name) {
             return false;
         } elseif (empty($this->survey_data)) {
             $courseId = $this->getCourseId();
diff --git a/public/main/gradebook/lib/fe/catform.class.php b/public/main/gradebook/lib/fe/catform.class.php
index f758f146fe..c65ae0e091 100644
--- a/public/main/gradebook/lib/fe/catform.class.php
+++ b/public/main/gradebook/lib/fe/catform.class.php
@@ -5,8 +5,6 @@
  * Class CatForm.
  *
  * @author Stijn Konings
- *
- * @package chamilo.gradebook
  */
 class CatForm extends FormValidator
 {
@@ -97,7 +95,7 @@ class CatForm extends FormValidator
     {
         // check if we are a root category
         // if so, you can only choose between courses
-        if ($this->category_object->get_parent_id() == '0') {
+        if ('0' == $this->category_object->get_parent_id()) {
             $this->setDefaults(
                 [
                     'select_course' => $this->category_object->get_course_code(),
@@ -154,7 +152,7 @@ class CatForm extends FormValidator
         $category_name = $this->category_object->get_name();
 
         // The main course category:
-        if (isset($this->category_object) && $this->category_object->get_parent_id() == 0) {
+        if (isset($this->category_object) && 0 == $this->category_object->get_parent_id()) {
             if (empty($category_name)) {
                 $category_name = $course_code;
             }
@@ -222,7 +220,7 @@ class CatForm extends FormValidator
         $this->addRule('name', get_lang('Required field'), 'required');
 
         if (isset($this->category_object) &&
-            $this->category_object->get_parent_id() == 0
+            0 == $this->category_object->get_parent_id()
         ) {
             // we can't change the root category
             $this->freeze('name');
@@ -284,7 +282,7 @@ class CatForm extends FormValidator
         }
 
         if (isset($this->category_object) &&
-            $this->category_object->get_parent_id() == 0
+            0 == $this->category_object->get_parent_id()
         ) {
             $model = ExerciseLib::getCourseScoreModel();
             if (empty($model)) {
@@ -344,8 +342,8 @@ class CatForm extends FormValidator
         );
 
         if (isset($this->category_object) &&
-            $this->category_object->get_parent_id() == 0 &&
-            (api_is_platform_admin() || api_get_setting('teachers_can_change_grade_model_settings') == 'true')
+            0 == $this->category_object->get_parent_id() &&
+            (api_is_platform_admin() || 'true' == api_get_setting('teachers_can_change_grade_model_settings'))
         ) {
             // Getting grade models
             $obj = new GradeModel();
@@ -373,7 +371,7 @@ class CatForm extends FormValidator
             }
 
             if (count($test_cats) > 1 || !empty($links)) {
-                if (api_get_setting('gradebook_enable_grade_model') == 'true') {
+                if ('true' == api_get_setting('gradebook_enable_grade_model')) {
                     $this->freeze('grade_model_id');
                 }
             }
@@ -416,7 +414,7 @@ class CatForm extends FormValidator
             }
         }
 
-        if ($this->form_type == self::TYPE_ADD) {
+        if (self::TYPE_ADD == $this->form_type) {
             $this->addButtonCreate(get_lang('Add category'));
         } else {
             $this->addElement('hidden', 'editcat', intval($_GET['editcat']));
@@ -425,7 +423,7 @@ class CatForm extends FormValidator
 
         $setting = api_get_setting('tool_visible_by_default_at_creation');
         $visibility_default = 1;
-        if (isset($setting['gradebook']) && $setting['gradebook'] == 'false') {
+        if (isset($setting['gradebook']) && 'false' == $setting['gradebook']) {
             $visibility_default = 0;
         }
 
diff --git a/public/main/gradebook/lib/fe/dataform.class.php b/public/main/gradebook/lib/fe/dataform.class.php
index 0c3d61ef4b..9b0b1e00cb 100644
--- a/public/main/gradebook/lib/fe/dataform.class.php
+++ b/public/main/gradebook/lib/fe/dataform.class.php
@@ -5,8 +5,6 @@
  * Extends FormValidator with import and export forms.
  *
  * @author Stijn Konings
- *
- * @package chamilo.gradebook
  */
 class DataForm extends FormValidator
 {
@@ -34,15 +32,15 @@ class DataForm extends FormValidator
     ) {
         parent:: __construct($form_name, $method, $action, $target);
         $this->form_type = $form_type;
-        if ($this->form_type == self::TYPE_IMPORT) {
+        if (self::TYPE_IMPORT == $this->form_type) {
             $this->build_import_form();
-        } elseif ($this->form_type == self::TYPE_EXPORT) {
-            if ($locked_status == 0) {
+        } elseif (self::TYPE_EXPORT == $this->form_type) {
+            if (0 == $locked_status) {
                 $this->build_export_form_option(false);
             } else {
                 $this->build_export_form();
             }
-        } elseif ($this->form_type == self::TYPE_EXPORT_PDF) {
+        } elseif (self::TYPE_EXPORT_PDF == $this->form_type) {
             $this->build_pdf_export_form();
         }
         $this->setDefaults();
diff --git a/public/main/gradebook/lib/fe/displaygradebook.php b/public/main/gradebook/lib/fe/displaygradebook.php
index 34584e4fc9..b2b4397c92 100644
--- a/public/main/gradebook/lib/fe/displaygradebook.php
+++ b/public/main/gradebook/lib/fe/displaygradebook.php
@@ -3,8 +3,6 @@
 
 /**
  * Class DisplayGradebook.
- *
- * @package chamilo.gradebook
  */
 class DisplayGradebook
 {
@@ -21,16 +19,16 @@ class DisplayGradebook
         $header = null;
         if (api_is_allowed_to_edit(null, true)) {
             $header = '<div class="actions">';
-            if ($page !== 'statistics') {
+            if ('statistics' !== $page) {
                 $header .= '<a href="'.Category::getUrl().'selectcat='.$selectcat.'">'.
                     Display::return_icon('back.png', get_lang('Assessment home'), '', ICON_SIZE_MEDIUM)
                     .'</a>';
-                if (($evalobj->get_course_code() != null) && !$evalobj->has_results()) {
+                if ((null != $evalobj->get_course_code()) && !$evalobj->has_results()) {
                     $header .= '<a href="gradebook_add_result.php?'.api_get_cidreq().'&selectcat='.$selectcat.'&selecteval='.$evalobj->get_id().'">
     				'.Display::return_icon('evaluation_rate.png', get_lang('Grade learners'), '', ICON_SIZE_MEDIUM).'</a>';
                 }
 
-                if (api_is_platform_admin() || $evalobj->is_locked() == false) {
+                if (api_is_platform_admin() || false == $evalobj->is_locked()) {
                     $header .= '<a href="'.api_get_self().'?'.api_get_cidreq().'&selecteval='.$evalobj->get_id().'&import=">'.
                         Display::return_icon('import_evaluation.png', get_lang('Import marks'), '', ICON_SIZE_MEDIUM).'</a>';
                 }
@@ -39,7 +37,7 @@ class DisplayGradebook
                     $header .= '<a href="'.api_get_self().'?'.api_get_cidreq().'&selecteval='.$evalobj->get_id().'&export=">'.
                         Display::return_icon('export_evaluation.png', get_lang('PDF Report'), '', ICON_SIZE_MEDIUM).'</a>';
 
-                    if (api_is_platform_admin() || $evalobj->is_locked() == false) {
+                    if (api_is_platform_admin() || false == $evalobj->is_locked()) {
                         $header .= '<a href="gradebook_edit_result.php?'.api_get_cidreq().'&selecteval='.$evalobj->get_id().'">'.
                             Display::return_icon('edit.png', get_lang('Grade learners'), '', ICON_SIZE_MEDIUM).'</a>';
                         $header .= '<a href="'.api_get_self().'?'.api_get_cidreq().'&selecteval='.$evalobj->get_id().'&deleteall=" onclick="return confirmationall();">'.
@@ -61,7 +59,7 @@ class DisplayGradebook
         if ($evalobj->has_results()) {
             // TODO this check needed ?
             $score = $evalobj->calc_score();
-            if ($score != null) {
+            if (null != $score) {
                 $model = ExerciseLib::getCourseScoreModel();
                 if (empty($model)) {
                     $average = get_lang('Average').' :<b> '.$scoredisplay->display_score($score, SCORE_AVERAGE).'</b>';
@@ -86,11 +84,11 @@ class DisplayGradebook
         }
 
         $description = '';
-        if (!$evalobj->get_description() == '') {
+        if ('' == !$evalobj->get_description()) {
             $description = get_lang('Description').' :<b> '.$evalobj->get_description().'</b><br>';
         }
 
-        if ($evalobj->get_course_code() == null) {
+        if (null == $evalobj->get_course_code()) {
             $course = get_lang('Independent from course');
         } else {
             $course = CourseManager::getCourseNameFromCode($evalobj->get_course_code());
@@ -112,7 +110,7 @@ class DisplayGradebook
             $evalinfo .= '<br /><i>'.get_lang('No results in evaluation for now').'</i>';
         }
 
-        if ($page != 'statistics') {
+        if ('statistics' != $page) {
             if (api_is_allowed_to_edit(null, true)) {
                 $evalinfo .= '<br /><a href="gradebook_statistics.php?'.api_get_cidreq().'&selecteval='.Security::remove_XSS($_GET['selecteval']).'"> '.
                     Display::return_icon(
@@ -144,7 +142,7 @@ class DisplayGradebook
     public static function display_header_reduce_flatview($catobj, $showeval, $showlink, $simple_search_form)
     {
         $header = '<div class="actions">';
-        if ($catobj->get_parent_id() == 0) {
+        if (0 == $catobj->get_parent_id()) {
             $select_cat = $catobj->get_id();
             $url = Category::getUrl();
         } else {
@@ -310,7 +308,7 @@ class DisplayGradebook
             );
         }
 
-        if (!$is_course_admin && ($status != 1 || $sessionStatus == 0) && $selectcat != 0) {
+        if (!$is_course_admin && (1 != $status || 0 == $sessionStatus) && 0 != $selectcat) {
             $catcourse = Category::load($catobj->get_id());
             /** @var Category $category */
             $category = $catcourse[0];
@@ -326,7 +324,7 @@ class DisplayGradebook
                 $item = $allEvalsLinks[$count];
                 $score = $item->calc_score($userId);
                 if (!empty($score)) {
-                    $divide = $score[1] == 0 ? 1 : $score[1];
+                    $divide = 0 == $score[1] ? 1 : $score[1];
                     $item_value = $score[0] / $divide * $item->get_weight();
                     $item_value_total += $item_value;
                 }
@@ -336,7 +334,7 @@ class DisplayGradebook
             $total_score = [$item_value_total, $item_total];
             $scorecourse_display = $scoredisplay->display_score($total_score, SCORE_DIV_PERCENT);
 
-            if (!$catobj->get_id() == '0' && !isset($_GET['studentoverview']) && !isset($_GET['search'])) {
+            if ('0' == !$catobj->get_id() && !isset($_GET['studentoverview']) && !isset($_GET['search'])) {
                 $additionalButtons = null;
                 if (!empty($certificateLinkInfo)) {
                     $additionalButtons .= '<div class="btn-group pull-right">';
@@ -350,10 +348,10 @@ class DisplayGradebook
         }
 
         // show navigation tree and buttons?
-        if ($showtree == '1' || isset($_GET['studentoverview'])) {
+        if ('1' == $showtree || isset($_GET['studentoverview'])) {
             $header = '<div class="actions"><table>';
             $header .= '<tr>';
-            if (!$selectcat == '0') {
+            if ('0' == !$selectcat) {
                 $header .= '<td><a href="'.api_get_self().'?selectcat='.$catobj->get_parent_id().'">'.
                     Display::return_icon(
                         'back.png',
@@ -383,14 +381,14 @@ class DisplayGradebook
                 $line = '';
             }
             $header .= '</select></form></td>';
-            if (!empty($simple_search_form) && $message_resource === false) {
+            if (!empty($simple_search_form) && false === $message_resource) {
                 $header .= '<td style="vertical-align: top;">'.$simple_search_form->toHtml().'</td>';
             } else {
                 $header .= '<td></td>';
             }
             if (!($is_course_admin &&
-                $message_resource === false &&
-                isset($_GET['selectcat']) && $_GET['selectcat'] != 0) &&
+                false === $message_resource &&
+                isset($_GET['selectcat']) && 0 != $_GET['selectcat']) &&
                 isset($_GET['studentoverview'])
             ) {
                 $header .= '<td style="vertical-align: top;">
@@ -413,8 +411,8 @@ class DisplayGradebook
 
         if ($accessToRead) {
             $my_category = $catobj->showAllCategoryInfo($catobj->get_id());
-            if ($selectcat != '0' && $accessToEdit) {
-                if ($my_api_cidreq == '') {
+            if ('0' != $selectcat && $accessToEdit) {
+                if ('' == $my_api_cidreq) {
                     $my_api_cidreq = 'cidReq='.$my_category['course_code'];
                 }
                 if ($show_add_link && !$message_resource) {
@@ -423,7 +421,7 @@ class DisplayGradebook
                             ICON_SIZE_MEDIUM).'</a>';
                     $cats = Category::load($selectcat);
 
-                    if ($cats[0]->get_course_code() != null && !$message_resource) {
+                    if (null != $cats[0]->get_course_code() && !$message_resource) {
                         $actionsLeft .= '<a href="gradebook_add_link.php?'.$my_api_cidreq.'&selectcat='.$catobj->get_id().'">'.
                             Display::return_icon('new_online_evaluation.png', get_lang('Add online activity'), '',
                                 ICON_SIZE_MEDIUM).'</a>';
@@ -434,7 +432,7 @@ class DisplayGradebook
                     }
                 }
             }
-            if ((empty($grade_model_id) || $grade_model_id == -1) && $accessToEdit) {
+            if ((empty($grade_model_id) || -1 == $grade_model_id) && $accessToEdit) {
                 $actionsLeft .= '<a href="gradebook_add_cat.php?'.api_get_cidreq().'&selectcat='.$catobj->get_id().'">'.
                     Display::return_icon(
                         'new_folder.png',
@@ -444,12 +442,12 @@ class DisplayGradebook
                     ).'</a></td>';
             }
 
-            if ($selectcat != '0' && $accessToRead) {
+            if ('0' != $selectcat && $accessToRead) {
                 if (!$message_resource) {
                     $actionsLeft .= '<a href="gradebook_flatview.php?'.$my_api_cidreq.'&selectcat='.$catobj->get_id().'">'.
                         Display::return_icon('statistics.png', get_lang('List View'), '', ICON_SIZE_MEDIUM).'</a>';
 
-                    if ($my_category['generate_certificates'] == 1) {
+                    if (1 == $my_category['generate_certificates']) {
                         $actionsLeft .= Display::url(
                             Display::return_icon(
                                 'certificate_list.png',
@@ -486,8 +484,8 @@ class DisplayGradebook
                             ).'&cidReq='.$catobj->get_course_code().'&id_session='.$catobj->get_session_id().'">'.
                             Display::return_icon('edit.png', get_lang('Edit'), '', ICON_SIZE_MEDIUM).'</a>';
 
-                        if (api_get_plugin_setting('customcertificate', 'enable_plugin_customcertificate') == 'true' &&
-                            api_get_course_setting('customcertificate_course_enable') == 1
+                        if ('true' == api_get_plugin_setting('customcertificate', 'enable_plugin_customcertificate') &&
+                            1 == api_get_course_setting('customcertificate_course_enable')
                         ) {
                             $actionsRight .= '<a href="'.api_get_path(
                                     WEB_PLUGIN_PATH
@@ -522,8 +520,8 @@ class DisplayGradebook
                                 ).'</a>';
                         }
                         $score_display_custom = api_get_setting('gradebook_score_display_custom');
-                        if (api_get_setting('teachers_can_change_score_settings') == 'true' &&
-                            $score_display_custom == 'true'
+                        if ('true' == api_get_setting('teachers_can_change_score_settings') &&
+                            'true' == $score_display_custom
                         ) {
                             $actionsRight .= '<a href="gradebook_scoring_system.php?'.$my_api_cidreq.'&selectcat='.$catobj->get_id().'">'.
                                 Display::return_icon('ranking.png', get_lang('Skills ranking'), '', ICON_SIZE_MEDIUM).'</a>';
@@ -585,7 +583,7 @@ class DisplayGradebook
 
             $msg = $weight.' - '.$min_certification.$edit_icon;
             //@todo show description
-            $description = (($catobj->get_description() == '' || is_null($catobj->get_description())) ? '' : '<strong>'.get_lang('Assessment description').'</strong>'.': '.$catobj->get_description());
+            $description = (('' == $catobj->get_description() || is_null($catobj->get_description())) ? '' : '<strong>'.get_lang('Assessment description').'</strong>'.': '.$catobj->get_description());
             echo Display::return_message($msg, 'normal', false);
             if (!empty($description)) {
                 echo Display::div($description, []);
@@ -620,7 +618,7 @@ class DisplayGradebook
             $scoretotal = $cattotal[0]->calc_score(api_get_user_id());
             $scoretotal_display = isset($scoretotal) ? $scoredisplay->display_score($scoretotal, SCORE_PERCENT) : get_lang('No results available');
             $scoreinfo = get_lang('Statistics of').' :<b> '.$user['complete_name'].'</b><br />';
-            if ((!$catobj->get_id() == '0') && (!isset($_GET['studentoverview'])) && (!isset($_GET['search']))) {
+            if (('0' == !$catobj->get_id()) && (!isset($_GET['studentoverview'])) && (!isset($_GET['search']))) {
                 $scoreinfo .= '<br />'.get_lang('Total for this category.').' : <b>'.$scorecourse_display.'</b>';
             }
             $scoreinfo .= '<br />'.get_lang('Total').' : <b>'.$scoretotal_display.'</b>';
@@ -676,7 +674,7 @@ class DisplayGradebook
         for ($count = 0; $count < count($evals_links); $count++) {
             $item = $evals_links[$count];
             $score = $item->calc_score($userId);
-            $my_score_denom = ($score[1] == 0) ? 1 : $score[1];
+            $my_score_denom = (0 == $score[1]) ? 1 : $score[1];
             $item_value += $score[0] / $my_score_denom * $item->get_weight();
             $item_total += $item->get_weight();
         }
@@ -690,7 +688,7 @@ class DisplayGradebook
         $info .= '<div class="col-md-6">';
         $info .= get_lang('Name').' :  '.$user['complete_name_with_message_link'].'<br />';
 
-        if (api_get_setting('show_email_addresses') == 'true') {
+        if ('true' == api_get_setting('show_email_addresses')) {
             $info .= get_lang('e-mail').' : <a href="mailto:'.$user['email'].'">'.$user['email'].'</a><br />';
         }
 
diff --git a/public/main/gradebook/lib/fe/evalform.class.php b/public/main/gradebook/lib/fe/evalform.class.php
index f52d5a7ca9..c9fe494618 100644
--- a/public/main/gradebook/lib/fe/evalform.class.php
+++ b/public/main/gradebook/lib/fe/evalform.class.php
@@ -7,8 +7,6 @@
  * Extends FormValidator with add&edit forms for evaluations
  *
  * @author Stijn Konings
- *
- * @package chamilo.gradebook
  */
 class EvalForm extends FormValidator
 {
@@ -98,12 +96,12 @@ class EvalForm extends FormValidator
         $user2 = $item2['user'];
         if (api_sort_by_first_name()) {
             $result = api_strcmp($user1['firstname'], $user2['firstname']);
-            if ($result == 0) {
+            if (0 == $result) {
                 return api_strcmp($user1['lastname'], $user2['lastname']);
             }
         } else {
             $result = api_strcmp($user1['lastname'], $user2['lastname']);
-            if ($result == 0) {
+            if (0 == $result) {
                 return api_strcmp($user1['firstname'], $user2['firstname']);
             }
         }
@@ -471,7 +469,7 @@ class EvalForm extends FormValidator
             ]
         );
         $this->build_basic_form();
-        if ($this->evaluation_object->get_course_code() == null) {
+        if (null == $this->evaluation_object->get_course_code()) {
             $this->addElement('checkbox', 'adduser', null, get_lang('Add users to evaluation'));
         } else {
             $this->addElement('checkbox', 'addresult', null, get_lang('Grade learners'));
@@ -486,7 +484,7 @@ class EvalForm extends FormValidator
     {
         $parent_cat = Category::load($this->evaluation_object->get_category_id());
         //@TODO $weight_mask is replaced?
-        if ($parent_cat[0]->get_parent_id() == 0) {
+        if (0 == $parent_cat[0]->get_parent_id()) {
             $weight_mask = $this->evaluation_object->get_weight();
         } else {
             $cat = Category::load($parent_cat[0]->get_parent_id());
@@ -522,7 +520,7 @@ class EvalForm extends FormValidator
     private function build_basic_form($edit = 0)
     {
         $form_title = get_lang('Add classroom activity');
-        if (!empty($_GET['editeval']) && $_GET['editeval'] == 1) {
+        if (!empty($_GET['editeval']) && 1 == $_GET['editeval']) {
             $form_title = get_lang('Edit evaluation');
         }
 
@@ -554,7 +552,7 @@ class EvalForm extends FormValidator
             false
         );
 
-        if (count($all_categories) == 1) {
+        if (1 == count($all_categories)) {
             $this->addElement('hidden', 'hid_category_id', $cat_id);
         } else {
             $select_gradebook = $this->addElement(
@@ -571,7 +569,7 @@ class EvalForm extends FormValidator
                     if ($my_cat->get_course_code() == api_get_course_id()) {
                         $grade_model_id = $my_cat->get_grade_model_id();
                         if (empty($grade_model_id)) {
-                            if ($my_cat->get_parent_id() == 0) {
+                            if (0 == $my_cat->get_parent_id()) {
                                 $default_weight = $my_cat->get_weight();
                                 $select_gradebook->addoption(get_lang('Default'), $my_cat->get_id());
                                 $cats_added[] = $my_cat->get_id();
@@ -697,7 +695,7 @@ class EvalForm extends FormValidator
         );
         $setting = api_get_setting('tool_visible_by_default_at_creation');
         $visibility_default = 1;
-        if (isset($setting['gradebook']) && $setting['gradebook'] == 'false') {
+        if (isset($setting['gradebook']) && 'false' == $setting['gradebook']) {
             $visibility_default = 0;
         }
         $this->setDefaults(['visible' => $visibility_default]);
@@ -719,7 +717,7 @@ class EvalForm extends FormValidator
         if ($this->evaluation_object->get_category_id() < 0) {
             $link = LinkFactory::get_evaluation_link($this->evaluation_object->get_id());
             $doc_url = $link->get_view_url($id);
-            if ($doc_url != null) {
+            if (null != $doc_url) {
                 $opendocurl_start .= '<a href="'.$doc_url.'" target="_blank">';
                 $opendocurl_end = '</a>';
             }
diff --git a/public/main/gradebook/lib/fe/exportgradebook.php b/public/main/gradebook/lib/fe/exportgradebook.php
index 1a882ec217..56a5876b9d 100644
--- a/public/main/gradebook/lib/fe/exportgradebook.php
+++ b/public/main/gradebook/lib/fe/exportgradebook.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 
 /**
@@ -165,7 +163,7 @@ function export_pdf_with_html($headers_table, $data_table, $headers_pdf, $footer
                 $content_table .= '<td>'.($item < 10 ? '0'.$item : $item).'</td>';
                 foreach ($data as $key => $content) {
                     if (isset($content)) {
-                        $key == 1 ? $align = 'align="left"' : $align = 'align="center"';
+                        1 == $key ? $align = 'align="left"' : $align = 'align="center"';
                         $content_table .= '<td '.$align.' style="padding:4px;" >'.$content.'</td>';
                     }
                 }
@@ -203,22 +201,22 @@ function export_pdf($pdf, $newarray, $header_names, $format)
 {
     $pdf->selectFont(api_get_path(LIBRARY_PATH).'ezpdf/fonts/Courier.afm');
     $pdf->ezSetCmMargins(0, 0, 0, 0);
-    $pdf->ezSetY(($format == 'portrait') ? '820' : '570');
+    $pdf->ezSetY(('portrait' == $format) ? '820' : '570');
     $pdf->selectFont(api_get_path(LIBRARY_PATH).'ezpdf/fonts/Courier.afm');
-    if ($format == 'portrait') {
+    if ('portrait' == $format) {
         $pdf->line(40, 790, 540, 790);
         $pdf->line(40, 40, 540, 40);
     } else {
         $pdf->line(40, 540, 790, 540);
         $pdf->line(40, 40, 790, 40);
     }
-    $pdf->ezSetY(($format == 'portrait') ? '750' : '520');
+    $pdf->ezSetY(('portrait' == $format) ? '750' : '520');
     $pdf->ezTable($newarray, $header_names, '', [
         'showHeadings' => 1,
         'shaded' => 1,
         'showLines' => 1,
         'rowGap' => 3,
-        'width' => (($format == 'portrait') ? '500' : '750'),
+        'width' => (('portrait' == $format) ? '500' : '750'),
     ]);
     $pdf->ezStream();
 }
diff --git a/public/main/gradebook/lib/fe/flatviewtable.class.php b/public/main/gradebook/lib/fe/flatviewtable.class.php
index dfe1133f80..4abf88c37a 100644
--- a/public/main/gradebook/lib/fe/flatviewtable.class.php
+++ b/public/main/gradebook/lib/fe/flatviewtable.class.php
@@ -14,8 +14,6 @@ use CpChart\Image as pImage;
  * @author Stijn Konings
  * @author Bert Steppé  - (refactored, optimised)
  * @author Julio Montoya Armas - Gradebook Graphics
- *
- * @package chamilo.gradebook
  */
 class FlatViewTable extends SortableTable
 {
@@ -317,7 +315,7 @@ class FlatViewTable extends SortableTable
                 $imgPath = api_get_path(WEB_ARCHIVE_PATH).$chartHash;
             }
             echo '<img src="'.$imgPath.'" >';
-            if ($i % 2 == 0 && $i != 0) {
+            if (0 == $i % 2 && 0 != $i) {
                 echo '<br /><br />';
             } else {
                 echo '&nbsp;&nbsp;&nbsp;';
@@ -410,12 +408,12 @@ class FlatViewTable extends SortableTable
 
         // retrieve sorting type
         if ($is_western_name_order) {
-            $users_sorting = ($this->column == 0 ? FlatViewDataGenerator::FVDG_SORT_FIRSTNAME : FlatViewDataGenerator::FVDG_SORT_LASTNAME);
+            $users_sorting = (0 == $this->column ? FlatViewDataGenerator::FVDG_SORT_FIRSTNAME : FlatViewDataGenerator::FVDG_SORT_LASTNAME);
         } else {
-            $users_sorting = ($this->column == 0 ? FlatViewDataGenerator::FVDG_SORT_LASTNAME : FlatViewDataGenerator::FVDG_SORT_FIRSTNAME);
+            $users_sorting = (0 == $this->column ? FlatViewDataGenerator::FVDG_SORT_LASTNAME : FlatViewDataGenerator::FVDG_SORT_FIRSTNAME);
         }
 
-        if ($this->direction == 'DESC') {
+        if ('DESC' == $this->direction) {
             $users_sorting |= FlatViewDataGenerator::FVDG_SORT_DESC;
         } else {
             $users_sorting |= FlatViewDataGenerator::FVDG_SORT_ASC;
diff --git a/public/main/gradebook/lib/fe/gradebooktable.class.php b/public/main/gradebook/lib/fe/gradebooktable.class.php
index d96b7149cd..ed17b6d721 100644
--- a/public/main/gradebook/lib/fe/gradebooktable.class.php
+++ b/public/main/gradebook/lib/fe/gradebooktable.class.php
@@ -12,8 +12,6 @@ use CpChart\Image as pImage;
  *
  * @author Stijn Konings
  * @author Bert Steppé (refactored, optimised)
- *
- * @package chamilo.gradebook
  */
 class GradebookTable extends SortableTable
 {
@@ -93,7 +91,7 @@ class GradebookTable extends SortableTable
 
         $column = 0;
         if ($this->teacherView) {
-            if ($this->exportToPdf == false) {
+            if (false == $this->exportToPdf) {
                 $this->set_header($column++, '', '', 'width="25px"');
             }
         }
@@ -101,7 +99,7 @@ class GradebookTable extends SortableTable
         $this->set_header($column++, get_lang('Type'), '', 'width="35px"');
         $this->set_header($column++, get_lang('Name'), false);
 
-        if ($this->exportToPdf == false) {
+        if (false == $this->exportToPdf) {
             $this->set_header($column++, get_lang('Description'), false);
         }
 
@@ -133,7 +131,7 @@ class GradebookTable extends SortableTable
         if ($this->teacherView) {
         } else {
             if (!empty($cats)) {
-                if ($this->exportToPdf == false) {
+                if (false == $this->exportToPdf) {
                     $this->set_header($column++, get_lang('Detail'), false);
                 }
             }
@@ -155,7 +153,7 @@ class GradebookTable extends SortableTable
             );
         } else {
             if (empty($_GET['selectcat']) && !$this->teacherView) {
-                if ($this->exportToPdf == false) {
+                if (false == $this->exportToPdf) {
                     $this->set_header(
                         $column++,
                         get_lang('Certificates'),
@@ -324,7 +322,7 @@ class GradebookTable extends SortableTable
                 break;
         }
 
-        if ($this->direction == 'DESC') {
+        if ('DESC' == $this->direction) {
             $sorting |= GradebookDataGenerator::GDG_SORT_DESC;
         } else {
             $sorting |= GradebookDataGenerator::GDG_SORT_ASC;
@@ -404,12 +402,12 @@ class GradebookTable extends SortableTable
                 $item = $data[0];
 
                 // If the item is invisible, wrap it in a span with class invisible
-                $invisibility_span_open = $isAllowedToEdit && $item->is_visible() == '0' ? '<span class="text-muted">' : '';
-                $invisibility_span_close = $isAllowedToEdit && $item->is_visible() == '0' ? '</span>' : '';
+                $invisibility_span_open = $isAllowedToEdit && '0' == $item->is_visible() ? '<span class="text-muted">' : '';
+                $invisibility_span_close = $isAllowedToEdit && '0' == $item->is_visible() ? '</span>' : '';
 
                 // Id
                 if ($this->teacherView) {
-                    if ($this->exportToPdf == false) {
+                    if (false == $this->exportToPdf) {
                         $row[] = $this->build_id_column($item);
                     }
                 }
@@ -418,7 +416,7 @@ class GradebookTable extends SortableTable
                 $row[] = $this->build_type_column($item);
 
                 // Name.
-                if (get_class($item) === 'Category') {
+                if ('Category' === get_class($item)) {
                     $row[] = $invisibility_span_open.'<strong>'.$item->get_name().'</strong>'.$invisibility_span_close;
                     $main_categories[$item->get_id()]['name'] = $item->get_name();
                 } else {
@@ -432,7 +430,7 @@ class GradebookTable extends SortableTable
                 $total_categories_weight += $item->get_weight();
 
                 // Description.
-                if ($this->exportToPdf == false) {
+                if (false == $this->exportToPdf) {
                     $row[] = $invisibility_span_open.$data[2].$invisibility_span_close;
                 }
 
@@ -465,7 +463,7 @@ class GradebookTable extends SortableTable
                 if ($this->teacherView) {
                     $cat = new Category();
                     $show_message = $cat->show_message_resource_delete($item->get_course_code());
-                    if ($show_message === false) {
+                    if (false === $show_message) {
                         $row[] = $this->build_edit_column($item);
                     }
                 } else {
@@ -553,8 +551,8 @@ class GradebookTable extends SortableTable
                         }
                     }
 
-                    if (get_class($item) === 'Category') {
-                        if ($this->exportToPdf == false) {
+                    if ('Category' === get_class($item)) {
+                        if (false == $this->exportToPdf) {
                             $row[] = $this->build_edit_column($item);
                         }
                     }
@@ -564,7 +562,7 @@ class GradebookTable extends SortableTable
                 $sortable_data[] = $row;
 
                 // Loading children
-                if (get_class($item) === 'Category') {
+                if ('Category' === get_class($item)) {
                     $parent_id = $item->get_id();
                     $cats = Category::load(
                         $parent_id,
@@ -600,8 +598,8 @@ class GradebookTable extends SortableTable
                             $item = $data[0];
 
                             //if the item is invisible, wrap it in a span with class invisible
-                            $invisibility_span_open = $isAllowedToEdit && $item->is_visible() == '0' ? '<span class="text-muted">' : '';
-                            $invisibility_span_close = $isAllowedToEdit && $item->is_visible() == '0' ? '</span>' : '';
+                            $invisibility_span_open = $isAllowedToEdit && '0' == $item->is_visible() ? '<span class="text-muted">' : '';
+                            $invisibility_span_close = $isAllowedToEdit && '0' == $item->is_visible() ? '</span>' : '';
 
                             if (isset($item)) {
                                 $main_categories[$parent_id]['children'][$item->get_id()]['name'] = $item->get_name();
@@ -609,7 +607,7 @@ class GradebookTable extends SortableTable
                             }
 
                             if ($this->teacherView) {
-                                if ($this->exportToPdf == false) {
+                                if (false == $this->exportToPdf) {
                                     $row[] = $this->build_id_column($item);
                                 }
                             }
@@ -622,7 +620,7 @@ class GradebookTable extends SortableTable
                                 $this->build_name_link($item, $type).$invisibility_span_close;
 
                             // Description.
-                            if ($this->exportToPdf == false) {
+                            if (false == $this->exportToPdf) {
                                 $row[] = $invisibility_span_open.$data[2].$invisibility_span_close;
                             }
 
@@ -634,13 +632,13 @@ class GradebookTable extends SortableTable
 
                             // Admins get an edit column.
                             if (api_is_allowed_to_edit(null, true) &&
-                                isset($_GET['user_id']) == false &&
-                                (isset($_GET['action']) && $_GET['action'] != 'export_all' || !isset($_GET['action']))
+                                false == isset($_GET['user_id']) &&
+                                (isset($_GET['action']) && 'export_all' != $_GET['action'] || !isset($_GET['action']))
                             ) {
                                 $cat = new Category();
                                 $show_message = $cat->show_message_resource_delete($item->get_course_code());
-                                if ($show_message === false) {
-                                    if ($this->exportToPdf == false) {
+                                if (false === $show_message) {
+                                    if (false == $this->exportToPdf) {
                                         $row[] = $this->build_edit_column($item);
                                     }
                                 }
@@ -678,13 +676,13 @@ class GradebookTable extends SortableTable
                                 }
 
                                 if (!empty($cats)) {
-                                    if ($this->exportToPdf == false) {
+                                    if (false == $this->exportToPdf) {
                                         $row[] = null;
                                     }
                                 }
                             }
 
-                            if ($this->exportToPdf == false) {
+                            if (false == $this->exportToPdf) {
                                 $row['child_of'] = $parent_id;
                             }
                             $sortable_data[] = $row;
@@ -730,7 +728,7 @@ class GradebookTable extends SortableTable
             /** @var Category $myCat */
             foreach ($main_cat as $myCat) {
                 $myParentId = $myCat->get_parent_id();
-                if ($myParentId == 0) {
+                if (0 == $myParentId) {
                     $main_weight = (int) $myCat->get_weight();
                 }
             }
@@ -893,7 +891,7 @@ class GradebookTable extends SortableTable
         if ($this->teacherView) {
             if (isset($_GET['selectcat']) &&
                 $_GET['selectcat'] > 0 &&
-                $view !== 'presence'
+                'presence' !== $view
             ) {
                 $id_cat = (int) $_GET['selectcat'];
                 $category = Category::load($id_cat);
@@ -1188,15 +1186,15 @@ class GradebookTable extends SortableTable
                 $show_message = $cat->show_message_resource_delete($course_id);
 
                 // course/platform admin can go to the view_results page
-                if (api_is_allowed_to_edit() && $show_message === false) {
-                    if ($item->get_type() == 'presence') {
+                if (api_is_allowed_to_edit() && false === $show_message) {
+                    if ('presence' == $item->get_type()) {
                         return '&nbsp;'
                             .'<a href="gradebook_view_result.php?cidReq='.$course_id.'&amp;selecteval='.$item->get_id().'">'
                             .$item->get_name()
                             .'</a>';
                     } else {
                         $extra = Display::label(get_lang('Score'));
-                        if ($type == 'simple') {
+                        if ('simple' == $type) {
                             $extra = '';
                         }
 
@@ -1205,13 +1203,13 @@ class GradebookTable extends SortableTable
                             .$item->get_name()
                             .'</a>&nbsp;'.$extra;
                     }
-                } elseif (ScoreDisplay::instance()->is_custom() && $show_message === false) {
+                } elseif (ScoreDisplay::instance()->is_custom() && false === $show_message) {
                     // students can go to the statistics page (if custom display enabled)
                     return '&nbsp;'
                         .'<a href="gradebook_statistics.php?'.api_get_cidreq().'&selecteval='.$item->get_id().'">'
                         .$item->get_name()
                         .'</a>';
-                } elseif ($show_message === false && !api_is_allowed_to_edit() && !ScoreDisplay::instance()->is_custom()) {
+                } elseif (false === $show_message && !api_is_allowed_to_edit() && !ScoreDisplay::instance()->is_custom()) {
                     return '&nbsp;'
                         .'<a href="gradebook_statistics.php?'.api_get_cidreq().'&selecteval='.$item->get_id().'">'
                         .$item->get_name()
@@ -1229,14 +1227,14 @@ class GradebookTable extends SortableTable
                 $url = $item->get_link();
 
                 $text = $item->get_name();
-                if (isset($url) && $show_message === false) {
+                if (isset($url) && false === $show_message) {
                     $text = '&nbsp;<a href="'.$item->get_link().'">'
                         .$item->get_name()
                         .'</a>';
                 }
 
                 $extra = Display::label($item->get_type_name(), 'info');
-                if ($type == 'simple') {
+                if ('simple' == $type) {
                     $extra = '';
                 }
                 $extra .= $item->getSkillsFromItem();
diff --git a/public/main/gradebook/lib/fe/linkaddeditform.class.php b/public/main/gradebook/lib/fe/linkaddeditform.class.php
index 5029b43e64..455669e732 100644
--- a/public/main/gradebook/lib/fe/linkaddeditform.class.php
+++ b/public/main/gradebook/lib/fe/linkaddeditform.class.php
@@ -6,8 +6,6 @@
  *
  * @author Stijn Konings
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class LinkAddEditForm extends FormValidator
 {
@@ -46,7 +44,7 @@ class LinkAddEditForm extends FormValidator
         }
 
         // ELEMENT: name
-        if ($form_type == self::TYPE_ADD || $link->is_allowed_to_change_name()) {
+        if (self::TYPE_ADD == $form_type || $link->is_allowed_to_change_name()) {
             if ($link->needs_name_and_description()) {
                 $this->addText('name', get_lang('Name'), true, ['size' => '40', 'maxlength' => '40']);
             } else {
@@ -70,7 +68,7 @@ class LinkAddEditForm extends FormValidator
             );
         }
 
-        if (count($category_object) == 1) {
+        if (1 == count($category_object)) {
             $this->addElement('hidden', 'select_gradebook', $category_object[0]->get_id());
         } else {
             $select_gradebook = $this->addElement(
@@ -87,7 +85,7 @@ class LinkAddEditForm extends FormValidator
                     if ($my_cat->get_course_code() == api_get_course_id()) {
                         $grade_model_id = $my_cat->get_grade_model_id();
                         if (empty($grade_model_id)) {
-                            if ($my_cat->get_parent_id() == 0) {
+                            if (0 == $my_cat->get_parent_id()) {
                                 $default_weight = $my_cat->get_weight();
                                 $select_gradebook->addoption(get_lang('Default'), $my_cat->get_id());
                             } else {
@@ -121,9 +119,9 @@ class LinkAddEditForm extends FormValidator
 
         $this->addElement('hidden', 'weight');
 
-        if ($form_type == self::TYPE_EDIT) {
+        if (self::TYPE_EDIT == $form_type) {
             $parent_cat = Category::load($link->get_category_id());
-            if ($parent_cat[0]->get_parent_id() == 0) {
+            if (0 == $parent_cat[0]->get_parent_id()) {
                 $values['weight'] = $link->get_weight();
             } else {
                 $cat = Category::load($parent_cat[0]->get_parent_id());
@@ -139,7 +137,7 @@ class LinkAddEditForm extends FormValidator
         }
         // ELEMENT: max
         if ($link->needs_max()) {
-            if ($form_type == self::TYPE_EDIT && $link->has_results()) {
+            if (self::TYPE_EDIT == $form_type && $link->has_results()) {
                 $this->addText(
                     'max',
                     get_lang('Maximum score'),
@@ -164,7 +162,7 @@ class LinkAddEditForm extends FormValidator
                     0
                 );
             }
-            if ($form_type == self::TYPE_EDIT) {
+            if (self::TYPE_EDIT == $form_type) {
                 $defaults['max'] = $link->get_max();
             }
         }
@@ -177,33 +175,33 @@ class LinkAddEditForm extends FormValidator
                 get_lang('Description'),
                 ['rows' => '3', 'cols' => '34']
             );
-            if ($form_type == self::TYPE_EDIT) {
+            if (self::TYPE_EDIT == $form_type) {
                 $defaults['description'] = $link->get_description();
             }
         }
 
         // ELEMENT: visible
-        $visible = ($form_type == self::TYPE_EDIT && $link->is_visible()) ? '1' : '0';
+        $visible = (self::TYPE_EDIT == $form_type && $link->is_visible()) ? '1' : '0';
         $this->addElement('checkbox', 'visible', null, get_lang('Visible'), $visible);
-        if ($form_type == self::TYPE_EDIT) {
+        if (self::TYPE_EDIT == $form_type) {
             $defaults['visible'] = $link->is_visible();
         }
 
         // ELEMENT: add results
-        if ($form_type == self::TYPE_ADD && $link->needs_results()) {
+        if (self::TYPE_ADD == $form_type && $link->needs_results()) {
             $this->addElement('checkbox', 'addresult', get_lang('Grade learners'));
         }
         // submit button
-        if ($form_type == self::TYPE_ADD) {
+        if (self::TYPE_ADD == $form_type) {
             $this->addButtonCreate(get_lang('Add this learning activity to the assessment'));
         } else {
             $this->addButtonUpdate(get_lang('Edit link'));
         }
 
-        if ($form_type == self::TYPE_ADD) {
+        if (self::TYPE_ADD == $form_type) {
             $setting = api_get_setting('tool_visible_by_default_at_creation');
             $visibility_default = 1;
-            if (isset($setting['gradebook']) && $setting['gradebook'] == 'false') {
+            if (isset($setting['gradebook']) && 'false' == $setting['gradebook']) {
                 $visibility_default = 0;
             }
             $defaults['visible'] = $visibility_default;
diff --git a/public/main/gradebook/lib/fe/linkform.class.php b/public/main/gradebook/lib/fe/linkform.class.php
index 91bfb57b32..e75b0d9775 100644
--- a/public/main/gradebook/lib/fe/linkform.class.php
+++ b/public/main/gradebook/lib/fe/linkform.class.php
@@ -7,8 +7,6 @@
  *
  * @author Stijn Konings
  * @author Bert Steppé (made more generic)
- *
- * @package chamilo.gradebook
  */
 class LinkForm extends FormValidator
 {
@@ -50,9 +48,9 @@ class LinkForm extends FormValidator
         if (isset($extra)) {
             $this->extra = $extra;
         }
-        if ($form_type == self::TYPE_CREATE) {
+        if (self::TYPE_CREATE == $form_type) {
             $this->build_create();
-        } elseif ($form_type == self::TYPE_MOVE) {
+        } elseif (self::TYPE_MOVE == $form_type) {
             $this->build_move();
         }
     }
@@ -102,19 +100,19 @@ class LinkForm extends FormValidator
 
         foreach ($linkTypes as $linkType) {
             // The hot potatoe link will be added "inside" the exercise option.
-            if ($linkType == LINK_HOTPOTATOES) {
+            if (LINK_HOTPOTATOES == $linkType) {
                 continue;
             }
             $link = $this->createLink($linkType, $courseCode);
             // disable this element if the link works with a dropdownlist
             // and if there are no links left
-            if (!$link->needs_name_and_description() && count($link->get_all_links()) == '0') {
+            if (!$link->needs_name_and_description() && '0' == count($link->get_all_links())) {
                 $select->addoption($link->get_type_name(), $linkType, 'disabled');
             } else {
                 $select->addoption($link->get_type_name(), $linkType);
             }
 
-            if ($link->get_type() == LINK_EXERCISE) {
+            if (LINK_EXERCISE == $link->get_type()) {
                 // Adding hot potatoes
                 $linkHot = $this->createLink(LINK_HOTPOTATOES, $courseCode);
                 $linkHot->setHp(true);
diff --git a/public/main/gradebook/lib/fe/resulttable.class.php b/public/main/gradebook/lib/fe/resulttable.class.php
index c5717a6eb2..42aec9a580 100644
--- a/public/main/gradebook/lib/fe/resulttable.class.php
+++ b/public/main/gradebook/lib/fe/resulttable.class.php
@@ -49,7 +49,7 @@ class ResultTable extends SortableTable
         }
         $scoredisplay = ScoreDisplay::instance();
         $column = 0;
-        if ($this->iscourse == '1') {
+        if ('1' == $this->iscourse) {
             $this->set_header($column++, '', false);
             $this->set_form_actions([
                     'delete' => get_lang('Delete'),
@@ -98,7 +98,7 @@ class ResultTable extends SortableTable
         $scoredisplay = ScoreDisplay::instance();
 
         // determine sorting type
-        $col_adjust = $this->iscourse == '1' ? 1 : 0;
+        $col_adjust = '1' == $this->iscourse ? 1 : 0;
 
         switch ($this->column) {
             // first name or last name
@@ -126,7 +126,7 @@ class ResultTable extends SortableTable
                 break;
         }
 
-        if ($this->direction === 'DESC') {
+        if ('DESC' === $this->direction) {
             $sorting |= ResultsDataGenerator::RDG_SORT_DESC;
         } else {
             $sorting |= ResultsDataGenerator::RDG_SORT_ASC;
@@ -140,7 +140,7 @@ class ResultTable extends SortableTable
         $sortable_data = [];
         foreach ($data_array as $item) {
             $row = [];
-            if ($this->iscourse == '1') {
+            if ('1' == $this->iscourse) {
                 $row[] = $item['result_id'];
             }
             if ($isWesternNameOrder) {
@@ -230,7 +230,7 @@ class ResultTable extends SortableTable
         $allowMultipleAttempts = api_get_configuration_value('gradebook_multiple_evaluation_attempts');
         $baseUrl = api_get_self().'?selecteval='.$this->evaluation->get_id().'&'.api_get_cidreq();
         $editColumn = '';
-        if (api_is_allowed_to_edit(null, true) && $locked_status == 0) {
+        if (api_is_allowed_to_edit(null, true) && 0 == $locked_status) {
             if ($allowMultipleAttempts) {
                 if (!empty($item['percentage_score'])) {
                     $editColumn .=
@@ -250,7 +250,7 @@ class ResultTable extends SortableTable
                 Display::return_icon('delete.png', get_lang('Delete'), '', '22').'</a>';
         }
 
-        if ($this->evaluation->get_course_code() == null) {
+        if (null == $this->evaluation->get_course_code()) {
             $editColumn .= '&nbsp;<a href="'.api_get_self().'?resultdelete='.$item['result_id'].'&selecteval='.$this->evaluation->get_id().'" onclick="return confirmationuser();">';
             $editColumn .= Display::return_icon('delete.png', get_lang('Delete'));
             $editColumn .= '</a>';
@@ -264,7 +264,7 @@ class ResultTable extends SortableTable
             $link = LinkFactory::get_evaluation_link($this->evaluation->get_id());
             $doc_url = $link->get_view_url($item['id']);
 
-            if ($doc_url != null) {
+            if (null != $doc_url) {
                 $editColumn .= '&nbsp;<a href="'.$doc_url.'" target="_blank">';
                 $editColumn .= Display::return_icon('link.gif', get_lang('Open document')).'</a>';
             }
diff --git a/public/main/gradebook/lib/fe/scoredisplayform.class.php b/public/main/gradebook/lib/fe/scoredisplayform.class.php
index a0c0a38d3a..791711e75d 100644
--- a/public/main/gradebook/lib/fe/scoredisplayform.class.php
+++ b/public/main/gradebook/lib/fe/scoredisplayform.class.php
@@ -7,8 +7,6 @@
  *
  * @author Stijn Konings
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class ScoreDisplayForm extends FormValidator
 {
@@ -22,7 +20,7 @@ class ScoreDisplayForm extends FormValidator
         $displayscore = ScoreDisplay::instance();
         $customdisplays = $displayscore->get_custom_score_display_settings();
 
-        $nr_items = (count($customdisplays) != '0') ? count($customdisplays) : '1';
+        $nr_items = ('0' != count($customdisplays)) ? count($customdisplays) : '1';
         $this->setDefaults(
             [
                 'scorecolpercent' => $displayscore->get_color_split_value(),
@@ -61,7 +59,7 @@ class ScoreDisplayForm extends FormValidator
                 ]
             );
 
-            if (api_get_setting('teachers_can_change_score_settings') != 'true') {
+            if ('true' != api_get_setting('teachers_can_change_score_settings')) {
                 $this->freeze('scorecolpercent');
             }
 
@@ -115,7 +113,7 @@ class ScoreDisplayForm extends FormValidator
                     <a href="javascript:plusItem('.($counter + 1).')">
                     <img style="display: '.(($counter >= $nr_items) ? 'inline' : 'none').';" id="plus-'.($counter + 1).'" src="'.Display::returnIconPath('add.png').'" alt="'.get_lang('Add').'" title="'.get_lang('Add').'"></a>
                     <a href="javascript:minItem('.($counter).')">
-                    <img style="display: '.(($counter >= $nr_items && $counter != 1) ? 'inline' : 'none').';" id="min-'.$counter.'" src="'.Display::returnIconPath('delete.png').'" alt="'.get_lang('Delete').'" title="'.get_lang('Delete').'"></a>
+                    <img style="display: '.(($counter >= $nr_items && 1 != $counter) ? 'inline' : 'none').';" id="min-'.$counter.'" src="'.Display::returnIconPath('delete.png').'" alt="'.get_lang('Delete').'" title="'.get_lang('Delete').'"></a>
                 </div>
                 </div>
                 </div>';
diff --git a/public/main/gradebook/lib/fe/userform.class.php b/public/main/gradebook/lib/fe/userform.class.php
index 0921fd222a..9ced5af6b5 100644
--- a/public/main/gradebook/lib/fe/userform.class.php
+++ b/public/main/gradebook/lib/fe/userform.class.php
@@ -6,8 +6,6 @@
  * Extends formvalidator with import and export forms.
  *
  * @author Stijn Konings
- *
- * @package chamilo.gradebook
  */
 class UserForm extends FormValidator
 {
@@ -33,9 +31,9 @@ class UserForm extends FormValidator
         if (isset($result_object)) {
             $this->result_object = $result_object;
         }
-        if ($this->form_type == self::TYPE_USER_INFO) {
+        if (self::TYPE_USER_INFO == $this->form_type) {
             $this->build_user_info_form();
-        } elseif ($this->form_type == self::TYPE_SIMPLE_SEARCH) {
+        } elseif (self::TYPE_SIMPLE_SEARCH == $this->form_type) {
             $this->build_simple_search();
         }
         $this->setDefaults();
diff --git a/public/main/gradebook/lib/fe/usertable.class.php b/public/main/gradebook/lib/fe/usertable.class.php
index a32354a26e..b0ad224907 100644
--- a/public/main/gradebook/lib/fe/usertable.class.php
+++ b/public/main/gradebook/lib/fe/usertable.class.php
@@ -7,8 +7,6 @@
  *
  * @author Stijn Konings
  * @author Bert Steppé (refactored, optimised, use of caching, datagenerator class)
- *
- * @package chamilo.gradebook
  */
 class UserTable extends SortableTable
 {
@@ -80,7 +78,7 @@ class UserTable extends SortableTable
                 $sorting = UserDataGenerator::UDG_SORT_MASK;
                 break;
         }
-        if ($this->direction === 'DESC') {
+        if ('DESC' === $this->direction) {
             $sorting |= UserDataGenerator::UDG_SORT_DESC;
         } else {
             $sorting |= UserDataGenerator::UDG_SORT_ASC;
@@ -89,7 +87,7 @@ class UserTable extends SortableTable
         // generate the data to display
         $sortable_data = [];
         foreach ($data_array as $data) {
-            if ($data[2] != '') {
+            if ('' != $data[2]) {
                 // filter by course removed
                 $row = [];
                 $row[] = $this->build_type_column($data[0]);
diff --git a/public/main/gradebook/lib/flatview_data_generator.class.php b/public/main/gradebook/lib/flatview_data_generator.class.php
index 486ace4cee..86ed9327ca 100644
--- a/public/main/gradebook/lib/flatview_data_generator.class.php
+++ b/public/main/gradebook/lib/flatview_data_generator.class.php
@@ -7,8 +7,6 @@
  * used for the teacher's flat view.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class FlatViewDataGenerator
 {
@@ -118,7 +116,7 @@ class FlatViewDataGenerator
         }
 
         $parent_id = $this->category->get_parent_id();
-        if ($parent_id == 0 ||
+        if (0 == $parent_id ||
             isset($this->params['only_subcat']) &&
             $this->params['only_subcat'] == $this->category->get_id()
         ) {
@@ -150,7 +148,7 @@ class FlatViewDataGenerator
         );
 
         $evaluationsAdded = [];
-        if ($parent_id == 0 && !empty($allcat)) {
+        if (0 == $parent_id && !empty($allcat)) {
             // Means there are any subcategory
             /** @var Category $sub_cat */
             foreach ($allcat as $sub_cat) {
@@ -162,7 +160,7 @@ class FlatViewDataGenerator
                     api_get_self().'?selectcat='.$sub_cat->get_id().'&'.api_get_cidreq()
                 ).$add_weight;
 
-                if (api_get_setting('gradebook_detailed_admin_view') === 'true') {
+                if ('true' === api_get_setting('gradebook_detailed_admin_view')) {
                     $links = $sub_cat->get_links();
                     $evaluations = $sub_cat->get_evaluations();
 
@@ -194,7 +192,7 @@ class FlatViewDataGenerator
         } else {
             if (!isset($this->params['only_total_category']) ||
                 (isset($this->params['only_total_category']) &&
-                    $this->params['only_total_category'] == false)
+                    false == $this->params['only_total_category'])
             ) {
                 for ($count = 0; ($count < $items_count) && ($items_start + $count < count($this->evals_links)); $count++) {
                     /** @var AbstractLink $item */
@@ -359,7 +357,7 @@ class FlatViewDataGenerator
 
         $parent_id = $this->category->get_parent_id();
 
-        if ($parent_id == 0 ||
+        if (0 == $parent_id ||
             (isset($this->params['only_subcat']) && $this->params['only_subcat'] == $this->category->get_id())
         ) {
             $main_weight = $this->category->get_weight();
@@ -441,12 +439,12 @@ class FlatViewDataGenerator
             );
 
             $evaluationsAdded = [];
-            if ($parent_id == 0 && !empty($allcat)) {
+            if (0 == $parent_id && !empty($allcat)) {
                 /** @var Category $sub_cat */
                 foreach ($allcat as $sub_cat) {
                     $score = $sub_cat->calc_score($user_id);
 
-                    if (api_get_setting('gradebook_detailed_admin_view') === 'true') {
+                    if ('true' === api_get_setting('gradebook_detailed_admin_view')) {
                         $links = $sub_cat->get_links();
                         /** @var ExerciseLink $link */
                         $linkScoreList = [];
@@ -471,7 +469,7 @@ class FlatViewDataGenerator
                     }
 
                     $real_score = $score;
-                    $divide = $score[1] == 0 ? 1 : $score[1];
+                    $divide = 0 == $score[1] ? 1 : $score[1];
                     $sub_cat_percentage = $sum_categories_weight_array[$sub_cat->get_id()];
                     $item_value = $score[0] / $divide * $main_weight;
 
@@ -486,7 +484,7 @@ class FlatViewDataGenerator
                         $defaultStyle = (int) $style;
                     }
 
-                    if (api_get_setting('gradebook_show_percentage_in_reports') === 'false') {
+                    if ('false' === api_get_setting('gradebook_show_percentage_in_reports')) {
                         $defaultShowPercentageValue = SCORE_SIMPLE;
                         if (!empty($style)) {
                             $defaultShowPercentageValue = $style;
@@ -518,10 +516,10 @@ class FlatViewDataGenerator
 
                     if (!isset($this->params['only_total_category']) ||
                         (isset($this->params['only_total_category']) &&
-                            $this->params['only_total_category'] == false)
+                            false == $this->params['only_total_category'])
                     ) {
                         if (!$show_all) {
-                            if (api_get_setting('gradebook_detailed_admin_view') === 'true') {
+                            if ('true' === api_get_setting('gradebook_detailed_admin_view')) {
                                 $finalList = array_merge($linkScoreList, $evalScoreList);
                                 if (empty($finalList)) {
                                     $average = 0;
@@ -660,7 +658,7 @@ class FlatViewDataGenerator
 
             // Fixing total when using one or multiple gradebooks.
             if (empty($parentCategoryIdFilter)) {
-                if ($this->category->get_parent_id() == 0) {
+                if (0 == $this->category->get_parent_id()) {
                     if (isset($score[0])) {
                         $item_value = $score[0] / $divide * $item->get_weight();
                     } else {
@@ -686,7 +684,7 @@ class FlatViewDataGenerator
                 SCORE_ONLY_SCORE
             );
 
-            if (api_get_setting('gradebook_show_percentage_in_reports') == 'false') {
+            if ('false' == api_get_setting('gradebook_show_percentage_in_reports')) {
                 $defaultShowPercentageValue = SCORE_SIMPLE;
                 if (!empty($style)) {
                     $defaultShowPercentageValue = $style;
@@ -716,7 +714,7 @@ class FlatViewDataGenerator
             }
 
             if (!isset($this->params['only_total_category']) ||
-                (isset($this->params['only_total_category']) && $this->params['only_total_category'] == false)
+                (isset($this->params['only_total_category']) && false == $this->params['only_total_category'])
             ) {
                 if (!$show_all) {
                     if (in_array(
@@ -847,11 +845,11 @@ class FlatViewDataGenerator
                 $item = $this->evals_links[$count];
                 $score = $item->calc_score($user[0]);
 
-                $divide = (($score[1]) == 0) ? 1 : $score[1];
+                $divide = (0 == ($score[1])) ? 1 : $score[1];
                 $item_value += $score[0] / $divide * $item->get_weight();
                 $item_total += $item->get_weight();
 
-                $score_denom = ($score[1] == 0) ? 1 : $score[1];
+                $score_denom = (0 == $score[1]) ? 1 : $score[1];
                 $score_final = ($score[0] / $score_denom) * 100;
                 $row[] = $score_final;
             }
@@ -901,12 +899,12 @@ class FlatViewDataGenerator
                 'ORDER BY id'
             );
             $parent_id = $this->category->get_parent_id();
-            if ($parent_id == 0 && !empty($allcat)) {
+            if (0 == $parent_id && !empty($allcat)) {
                 foreach ($allcat as $sub_cat) {
                     $score = $sub_cat->calc_score($user[0]);
                     $real_score = $score;
                     $main_weight = $this->category->get_weight();
-                    $divide = $score[1] == 0 ? 1 : $score[1];
+                    $divide = 0 == $score[1] ? 1 : $score[1];
 
                     //$sub_cat_percentage = $sum_categories_weight_array[$sub_cat->get_id()];
                     $item_value = $score[0] / $divide * $main_weight;
@@ -943,10 +941,10 @@ class FlatViewDataGenerator
                 for ($count = 0; $count < count($this->evals_links); $count++) {
                     $item = $this->evals_links[$count];
                     $score = $item->calc_score($user[0]);
-                    $divide = $score[1] == 0 ? 1 : $score[1];
+                    $divide = 0 == $score[1] ? 1 : $score[1];
                     $item_value += $score[0] / $divide * $item->get_weight();
                     $item_total += $item->get_weight();
-                    $score_denom = ($score[1] == 0) ? 1 : $score[1];
+                    $score_denom = (0 == $score[1]) ? 1 : $score[1];
                     $score_final = ($score[0] / $score_denom) * 100;
                     $row[] = [
                         $score_final,
diff --git a/public/main/gradebook/lib/gradebook_data_generator.class.php b/public/main/gradebook/lib/gradebook_data_generator.class.php
index 6a6af288a6..0c5f2bbd3c 100644
--- a/public/main/gradebook/lib/gradebook_data_generator.class.php
+++ b/public/main/gradebook/lib/gradebook_data_generator.class.php
@@ -9,8 +9,6 @@ use ChamiloSession as Session;
  * used for the general gradebook view.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class GradebookDataGenerator
 {
@@ -256,7 +254,7 @@ class GradebookDataGenerator
                                             $evalres = $eval->calc_score($user['user_id'], null);
                                             $eval->setStudentList($studentList);
 
-                                            if (isset($evalres) && $eval->get_weight() != 0) {
+                                            if (isset($evalres) && 0 != $eval->get_weight()) {
                                                 $evalweight = $eval->get_weight();
                                                 $weightsum += $evalweight;
                                                 if (!empty($evalres[1])) {
@@ -267,7 +265,7 @@ class GradebookDataGenerator
                                                     $bestResult = $ressum;
                                                 }
                                             } else {
-                                                if ($eval->get_weight() != 0) {
+                                                if (0 != $eval->get_weight()) {
                                                     $evalweight = $eval->get_weight();
                                                     $weightsum += $evalweight;
                                                 }
@@ -284,9 +282,9 @@ class GradebookDataGenerator
                                             }
 
                                             $linkres = $link->calc_score($user['user_id'], null);
-                                            if (!empty($linkres) && $link->get_weight() != 0) {
+                                            if (!empty($linkres) && 0 != $link->get_weight()) {
                                                 $linkweight = $link->get_weight();
-                                                $link_res_denom = $linkres[1] == 0 ? 1 : $linkres[1];
+                                                $link_res_denom = 0 == $linkres[1] ? 1 : $linkres[1];
 
                                                 $weightsum += $linkweight;
                                                 $ressum += $linkres[0] / $link_res_denom * $linkweight;
@@ -295,7 +293,7 @@ class GradebookDataGenerator
                                                 }
                                             } else {
                                                 // Adding if result does not exists
-                                                if ($link->get_weight() != 0) {
+                                                if (0 != $link->get_weight()) {
                                                     $linkweight = $link->get_weight();
                                                     $weightsum += $linkweight;
                                                 }
@@ -484,7 +482,7 @@ class GradebookDataGenerator
     public function sort_by_description($item1, $item2)
     {
         $result = api_strcmp($item1->get_description(), $item2->get_description());
-        if ($result == 0) {
+        if (0 == $result) {
             return $this->sort_by_name($item1, $item2);
         }
 
@@ -565,7 +563,7 @@ class GradebookDataGenerator
             true
         );
         $type = $item->get_item_type();
-        if ($type == 'L' && get_class($item) === 'ExerciseLink') {
+        if ('L' == $type && 'ExerciseLink' === get_class($item)) {
             $display = ExerciseLib::show_score($score[0], $score[1], false);
         }
 
@@ -597,7 +595,7 @@ class GradebookDataGenerator
         );
         $type = $item->get_item_type();
 
-        if ($type === 'L' && get_class($item) === 'ExerciseLink') {
+        if ('L' === $type && 'ExerciseLink' === get_class($item)) {
             $display = ExerciseLib::show_score($score[0], $score[1], false);
             $result = ExerciseLib::convertScoreToPlatformSetting($score[0], $score[1]);
             $score[0] = $result['score'];
@@ -659,7 +657,7 @@ class GradebookDataGenerator
             switch ($item->get_item_type()) {
                 // category
                 case 'C':
-                    if ($score != null) {
+                    if (null != $score) {
                         if (empty($model)) {
                             return [
                                 'display' => $scoreDisplay->display_score(
@@ -704,7 +702,7 @@ class GradebookDataGenerator
                         );
 
                         $type = $item->get_item_type();
-                        if ($type == 'L' && get_class($item) == 'ExerciseLink') {
+                        if ('L' == $type && 'ExerciseLink' == get_class($item)) {
                             $display = ExerciseLib::show_score(
                                 $score[0],
                                 $score[1],
diff --git a/public/main/gradebook/lib/gradebook_result.class.php b/public/main/gradebook/lib/gradebook_result.class.php
index e07145ec76..9319ab23fe 100644
--- a/public/main/gradebook/lib/gradebook_result.class.php
+++ b/public/main/gradebook/lib/gradebook_result.class.php
@@ -5,8 +5,6 @@
  * Gradebook results class.
  *
  * @author Yannick Warnier
- *
- * @package chamilo.gradebook
  */
 class GradeBookResult
 {
diff --git a/public/main/gradebook/lib/results_data_generator.class.php b/public/main/gradebook/lib/results_data_generator.class.php
index 218a00a70c..5fde377829 100644
--- a/public/main/gradebook/lib/results_data_generator.class.php
+++ b/public/main/gradebook/lib/results_data_generator.class.php
@@ -7,8 +7,6 @@
  * used for the teacher's evaluation results view.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class ResultsDataGenerator
 {
@@ -106,7 +104,7 @@ class ResultsDataGenerator
                 true
             );
 
-            if ($pdf && $number_decimals == null) {
+            if ($pdf && null == $number_decimals) {
                 $user['scoreletter'] = $result->get_score();
             }
             if ($scoreDisplay->is_custom()) {
@@ -213,10 +211,10 @@ class ResultsDataGenerator
         $realscore,
         $ignore_score_color = false
     ) {
-        if ($score != null) {
+        if (null != $score) {
             $scoreDisplay = ScoreDisplay::instance();
             $type = SCORE_CUSTOM;
-            if ($realscore === true) {
+            if (true === $realscore) {
                 $type = SCORE_DIV_PERCENT;
             }
 
diff --git a/public/main/gradebook/lib/scoredisplay.class.php b/public/main/gradebook/lib/scoredisplay.class.php
index 6273cf675e..21356652bd 100644
--- a/public/main/gradebook/lib/scoredisplay.class.php
+++ b/public/main/gradebook/lib/scoredisplay.class.php
@@ -7,8 +7,6 @@
  * This class works as a singleton: call instance() to retrieve an object.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class ScoreDisplay
 {
@@ -34,7 +32,7 @@ class ScoreDisplay
         $value = api_get_setting('gradebook_score_display_coloring');
 
         // Setting coloring.
-        $this->coloring_enabled = $value == 'true' ? true : false;
+        $this->coloring_enabled = 'true' == $value ? true : false;
 
         if ($this->coloring_enabled) {
             $value = api_get_setting('gradebook_score_display_colorsplit');
@@ -45,7 +43,7 @@ class ScoreDisplay
 
         // Setting custom enabled
         $value = api_get_setting('gradebook_score_display_custom');
-        $this->custom_enabled = $value == 'true' ? true : false;
+        $this->custom_enabled = 'true' == $value ? true : false;
 
         if ($this->custom_enabled) {
             $params = ['category = ?' => ['Gradebook']];
@@ -68,14 +66,14 @@ class ScoreDisplay
             if (count($this->custom_display) > 0) {
                 $value = api_get_setting('gradebook_score_display_upperlimit');
                 $value = $value['my_display_upperlimit'];
-                $this->upperlimit_included = $value == 'true' ? true : false;
+                $this->upperlimit_included = 'true' == $value ? true : false;
                 $this->custom_display_conv = $this->convert_displays($this->custom_display);
             }
         }
 
         //If teachers can override the portal parameters
 
-        if (api_get_setting('teachers_can_change_score_settings') == 'true') {
+        if ('true' == api_get_setting('teachers_can_change_score_settings')) {
             //Load course settings
             if ($this->custom_enabled) {
                 $this->custom_display = $this->get_custom_displays();
@@ -302,20 +300,20 @@ class ScoreDisplay
         $disableColor = false,
         $ignoreDecimals = false
     ) {
-        $my_score = $score == 0 ? 1 : $score;
+        $my_score = 0 == $score ? 1 : $score;
 
-        if ($type == SCORE_BAR) {
+        if (SCORE_BAR == $type) {
             $percentage = $my_score[0] / $my_score[1] * 100;
 
             return Display::bar_progress($percentage);
         }
-        if ($type == SCORE_NUMERIC) {
+        if (SCORE_NUMERIC == $type) {
             $percentage = $my_score[0] / $my_score[1] * 100;
 
             return round($percentage);
         }
 
-        if ($type == SCORE_SIMPLE) {
+        if (SCORE_SIMPLE == $type) {
             $simpleScore = $this->format_score($my_score[0], $ignoreDecimals);
 
             return $simpleScore;
@@ -327,7 +325,7 @@ class ScoreDisplay
             // if no custom display set, use default display
             $display = $this->display_default($my_score, $type, $ignoreDecimals);
         }
-        if ($this->coloring_enabled && $disableColor == false) {
+        if ($this->coloring_enabled && false == $disableColor) {
             $my_score_denom = isset($score[1]) && !empty($score[1]) && $score[1] > 0 ? $score[1] : 1;
             $scoreCleaned = isset($score[0]) ? $score[0] : 0;
             if (($scoreCleaned / $my_score_denom) < ($this->color_split_value / 100)) {
@@ -453,7 +451,7 @@ class ScoreDisplay
      */
     private function display_as_decimal($score)
     {
-        $score_denom = ($score[1] == 0) ? 1 : $score[1];
+        $score_denom = (0 == $score[1]) ? 1 : $score[1];
 
         return $this->format_score($score[0] / $score_denom);
     }
@@ -463,7 +461,7 @@ class ScoreDisplay
      */
     private function display_as_percent($score)
     {
-        $score_denom = ($score[1] == 0) ? 1 : $score[1];
+        $score_denom = (0 == $score[1]) ? 1 : $score[1];
 
         return $this->format_score($score[0] / $score_denom * 100).' %';
     }
@@ -478,7 +476,7 @@ class ScoreDisplay
      */
     private function display_as_div($score, $ignoreDecimals = false)
     {
-        if ($score == 1) {
+        if (1 == $score) {
             return '0 / 0';
         } else {
             $score[0] = isset($score[0]) ? $this->format_score($score[0], $ignoreDecimals) : 0;
@@ -497,7 +495,7 @@ class ScoreDisplay
      */
     private function display_custom($score)
     {
-        $my_score_denom = $score[1] == 0 ? 1 : $score[1];
+        $my_score_denom = 0 == $score[1] ? 1 : $score[1];
         $scaledscore = $score[0] / $my_score_denom;
 
         if ($this->upperlimit_included) {
@@ -509,7 +507,7 @@ class ScoreDisplay
         } else {
             if (!empty($this->custom_display_conv)) {
                 foreach ($this->custom_display_conv as $displayitem) {
-                    if ($scaledscore < $displayitem['score'] || $displayitem['score'] == 1) {
+                    if ($scaledscore < $displayitem['score'] || 1 == $displayitem['score']) {
                         return $displayitem['display'];
                     }
                 }
diff --git a/public/main/gradebook/lib/user_data_generator.class.php b/public/main/gradebook/lib/user_data_generator.class.php
index 24399f49d2..6d537df6f7 100644
--- a/public/main/gradebook/lib/user_data_generator.class.php
+++ b/public/main/gradebook/lib/user_data_generator.class.php
@@ -7,8 +7,6 @@
  * used for a student's general view.
  *
  * @author Bert Steppé
- *
- * @package chamilo.gradebook
  */
 class UserDataGenerator
 {
@@ -48,7 +46,7 @@ class UserDataGenerator
             $coursecode = $eval->get_course_code();
             if (isset($coursecode)) {
                 $result = Result::load(null, $userid, $eval->get_id());
-                if (count($result) == 0) {
+                if (0 == count($result)) {
                     $toadd = false;
                 }
             }
@@ -56,7 +54,7 @@ class UserDataGenerator
                 $evals_filtered_copy = $evals;
             }
         }
-        if (count($result) == 0) {
+        if (0 == count($result)) {
             $evals_filtered = $evals;
         } else {
             $evals_filtered = $evals_filtered_copy;
@@ -440,7 +438,7 @@ class UserDataGenerator
     private function get_category_name_to_display($cat)
     {
         if (isset($cat)) {
-            if ($cat->get_parent_id() == '0' || $cat->get_parent_id() == null) {
+            if ('0' == $cat->get_parent_id() || null == $cat->get_parent_id()) {
                 return '';
             } else {
                 return $cat->get_name();
diff --git a/public/main/gradebook/my_certificates.php b/public/main/gradebook/my_certificates.php
index 12fc64b171..9dd66ecf4b 100644
--- a/public/main/gradebook/my_certificates.php
+++ b/public/main/gradebook/my_certificates.php
@@ -5,8 +5,6 @@
  * List of achieved certificates by the current user.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.gradebook
  */
 $cidReset = true;
 
@@ -43,7 +41,7 @@ $template->assign('session_list', $sessionList);
 $templateName = $template->get_template('gradebook/my_certificates.tpl');
 $content = $template->fetch($templateName);
 
-if (api_get_setting('allow_public_certificates') === 'true') {
+if ('true' === api_get_setting('allow_public_certificates')) {
     $template->assign(
         'actions',
         Display::toolbarButton(
diff --git a/public/main/gradebook/search.php b/public/main/gradebook/search.php
index 2bee320a9d..8d91835e2f 100644
--- a/public/main/gradebook/search.php
+++ b/public/main/gradebook/search.php
@@ -5,14 +5,12 @@
  * Search user certificates if them are publics.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.gradebook
  */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
 
-if (api_get_setting('allow_public_certificates') != 'true') {
+if ('true' != api_get_setting('allow_public_certificates')) {
     api_not_allowed(
         true,
         Display::return_message(get_lang('Certificates are not publicly available'), 'warning')
diff --git a/public/main/gradebook/skill_rel_user.php b/public/main/gradebook/skill_rel_user.php
index 08fd949bb9..aa1501e6dd 100644
--- a/public/main/gradebook/skill_rel_user.php
+++ b/public/main/gradebook/skill_rel_user.php
@@ -5,7 +5,7 @@ use Chamilo\SkillBundle\Entity\SkillRelItem;
 
 require_once __DIR__.'/../inc/global.inc.php';
 
-if (api_get_configuration_value('allow_skill_rel_items') == false) {
+if (false == api_get_configuration_value('allow_skill_rel_items')) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/gradebook/user_stats.php b/public/main/gradebook/user_stats.php
index dada12f786..4d97788d44 100644
--- a/public/main/gradebook/user_stats.php
+++ b/public/main/gradebook/user_stats.php
@@ -3,8 +3,6 @@
 
 /**
  * Script.
- *
- * @package chamilo.gradebook
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/group/group_category.php b/public/main/group/group_category.php
index ae16689df8..ee1f282c04 100644
--- a/public/main/group/group_category.php
+++ b/public/main/group/group_category.php
@@ -119,7 +119,7 @@ $form->addText('title', get_lang('Title'));
 
 // Groups per user
 $possible_values = [];
-for ($i = 1; $i <= 10; ++$i) {
+for ($i = 1; $i <= 10; $i++) {
     $possible_values[$i] = $i;
 }
 $possible_values[GroupManager::GROUP_PER_MEMBER_NO_LIMIT] = get_lang('All');
diff --git a/public/main/group/group_creation.php b/public/main/group/group_creation.php
index 51c7475ac1..9aaa63c2cd 100644
--- a/public/main/group/group_creation.php
+++ b/public/main/group/group_creation.php
@@ -23,7 +23,7 @@ if (isset($_POST['action'])) {
                 $useOnlyFirstCategory = true;
             }
 
-            for ($i = 0; $i < $_POST['number_of_groups']; ++$i) {
+            for ($i = 0; $i < $_POST['number_of_groups']; $i++) {
                 $group1['name'] = empty($_POST['group_'.$i.'_name']) ? get_lang('Group').' '.$i : $_POST['group_'.$i.'_name'];
                 $group1['category'] = isset($_POST['group_'.$i.'_category']) ? $_POST['group_'.$i.'_category'] : null;
                 if ($useOnlyFirstCategory) {
@@ -193,7 +193,7 @@ EOT;
             $form->addGroup($group_el, 'groups', null, '</td><td>', false);
         }
         // Properties for all groups
-        for ($group_number = 0; $group_number < $_POST['number_of_groups']; ++$group_number) {
+        for ($group_number = 0; $group_number < $_POST['number_of_groups']; $group_number++) {
             $group_el = [];
             $group_el[] = $form->createElement('text', 'group_'.$group_number.'_name');
             if ('true' === api_get_setting('allow_group_categories')) {
diff --git a/public/main/help/allowed_html_tags.php b/public/main/help/allowed_html_tags.php
index 268cc52ca8..dfefc28d21 100644
--- a/public/main/help/allowed_html_tags.php
+++ b/public/main/help/allowed_html_tags.php
@@ -4,8 +4,6 @@
 /**
  *	This	 script displays a help window with an overview of the allowed HTML-
  *   tags  and their attributes.
- *
- *	@package chamilo.help
  */
 require '../inc/global.inc.php';
 
@@ -24,7 +22,7 @@ header('Content-Type: text/html; charset='.api_get_system_encoding());
 /*]]>*/
 </style>
 <?php
-if (api_get_setting('stylesheets') != '') {
+if ('' != api_get_setting('stylesheets')) {
     ?>
 	<style type="text/css" media="screen, projection">
 	/*<![CDATA[*/
@@ -42,9 +40,9 @@ if (api_get_setting('stylesheets') != '') {
 <?php echo get_lang('Allowed HTML tags'); ?>
 </h4>
 <?php
-$html_type = $_SESSION['status'] == COURSEMANAGER ? TEACHER_HTML : STUDENT_HTML;
+$html_type = COURSEMANAGER == $_SESSION['status'] ? TEACHER_HTML : STUDENT_HTML;
 
-$fullpage = intval($_GET['fullpage']) != 0;
+$fullpage = 0 != intval($_GET['fullpage']);
 $tags = HTML_QuickForm_Rule_HTML :: get_allowed_tags($html_type, $fullpage);
 $table_header = [];
 $table_header[] = ['tag', true];
diff --git a/public/main/help/faq.php b/public/main/help/faq.php
index deb0f69ffd..0803d437a4 100644
--- a/public/main/help/faq.php
+++ b/public/main/help/faq.php
@@ -3,8 +3,6 @@
 
 /**
  * This script displays a help window.
- *
- * @package chamilo.help
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $help_name = isset($_GET['open']) ? Security::remove_XSS($_GET['open']) : null;
@@ -18,7 +16,7 @@ if (api_is_platform_admin()) {
 echo Display::page_header(get_lang('Frequently Asked Question'));
 
 $faq_file = 'faq.html';
-if (!empty($_GET['edit']) && $_GET['edit'] == 'true' && api_is_platform_admin()) {
+if (!empty($_GET['edit']) && 'true' == $_GET['edit'] && api_is_platform_admin()) {
     $form = new FormValidator('set_faq', 'post', 'faq.php?edit=true');
     $form->addHtmlEditor(
         'faq_content',
diff --git a/public/main/help/help.php b/public/main/help/help.php
index b9359c9fb3..c068e9380e 100644
--- a/public/main/help/help.php
+++ b/public/main/help/help.php
@@ -3,8 +3,6 @@
 
 /**
  *	This script displays a help window.
- *
- *	@package chamilo.help
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/inc/ajax/admin.ajax.php b/public/main/inc/ajax/admin.ajax.php
index 4fc4d98511..2dd7fd4f48 100644
--- a/public/main/inc/ajax/admin.ajax.php
+++ b/public/main/inc/ajax/admin.ajax.php
@@ -20,7 +20,7 @@ switch ($action) {
     case 'update_changeable_setting':
         $url_id = api_get_current_access_url_id();
 
-        if (api_is_global_platform_admin() && $url_id == 1) {
+        if (api_is_global_platform_admin() && 1 == $url_id) {
             if (isset($_GET['id']) && !empty($_GET['id'])) {
                 $params = ['variable = ? ' => [$_GET['id']]];
                 $data = api_get_settings_params($params);
@@ -53,7 +53,7 @@ switch ($action) {
         if (api_is_multiple_url_enabled()) {
             $accessUrlId = api_get_current_access_url_id();
 
-            if ($accessUrlId != -1) {
+            if (-1 != $accessUrlId) {
                 $urlInfo = api_get_access_url($accessUrlId);
                 $url = api_remove_trailing_slash(preg_replace('/https?:\/\//i', '', $urlInfo['url']));
                 $cleanUrl = str_replace('/', '-', $url);
@@ -69,7 +69,7 @@ switch ($action) {
 
         break;
     case 'get_latest_news':
-        if (api_get_configuration_value('admin_chamilo_announcements_disable') === true) {
+        if (true === api_get_configuration_value('admin_chamilo_announcements_disable')) {
             break;
         }
 
@@ -104,7 +104,7 @@ function version_check()
 
     // The site has not been registered yet.
     $return = '';
-    if ($row['selected_value'] == 'false') {
+    if ('false' == $row['selected_value']) {
         $return .= get_lang('In order to enable the automatic version checking you have to register your portal on chamilo.org. The information obtained by clicking this button is only for internal use and only aggregated data will be publicly available (total number of portals, total number of chamilo course, total number of chamilo users, ...) (see <a href="http://www.chamilo.org/stats/">http://www.chamilo.org/stats/</a>. When registering you will also appear on the worldwide list (<a href="http://www.chamilo.org/community.php">http://www.chamilo.org/community.php</a>. If you do not want to appear in this list you have to check the checkbox below. The registration is as easy as it can be: you only have to click this button: <br />');
         $return .= '<form class="version-checking" action="'.api_get_path(WEB_CODE_PATH).'admin/index.php" id="VersionCheck" name="VersionCheck" method="post">';
         $return .= '<label class="checkbox"><input type="checkbox" name="donotlistcampus" value="1" id="checkbox" />'.get_lang('Hide campus from public platforms list');
@@ -145,7 +145,7 @@ function check_system_version()
     try {
         $client = new GuzzleHttp\Client();
         $res = $client->request('GET', $url, $options);
-        if ($res->getStatusCode() == '200' || $res->getStatusCode() == '301') {
+        if ('200' == $res->getStatusCode() || '301' == $res->getStatusCode()) {
             $urlValidated = true;
         }
     } catch (Exception $e) {
@@ -215,7 +215,7 @@ function check_system_version()
             $url .= urlencode($k).'='.urlencode($v).'&';
         }
         $res = $client->request('GET', $url, $options);
-        if ($res->getStatusCode() == '200') {
+        if ('200' == $res->getStatusCode()) {
             $versionData = $res->getHeader('X-Chamilo-Version');
             if (isset($versionData[0])) {
                 $version = trim($versionData[0]);
@@ -259,7 +259,7 @@ function getLatestNews()
         ]
     );
 
-    if ($response->getStatusCode() !== 200) {
+    if (200 !== $response->getStatusCode()) {
         throw new Exception(get_lang('Deny access'));
     }
 
diff --git a/public/main/inc/ajax/agenda.ajax.php b/public/main/inc/ajax/agenda.ajax.php
index 389b9010e7..6c45d82dde 100644
--- a/public/main/inc/ajax/agenda.ajax.php
+++ b/public/main/inc/ajax/agenda.ajax.php
@@ -7,7 +7,7 @@
  */
 $type = isset($_REQUEST['type']) && in_array($_REQUEST['type'], ['personal', 'course', 'admin']) ? $_REQUEST['type'] : 'personal';
 
-if ($type === 'personal') {
+if ('personal' === $type) {
     $cidReset = true; // fixes #5162
 }
 
@@ -16,7 +16,7 @@ require_once __DIR__.'/../global.inc.php';
 $action = isset($_REQUEST['a']) ? $_REQUEST['a'] : null;
 $group_id = api_get_group_id();
 
-if ($type === 'course') {
+if ('course' === $type) {
     api_protect_course_script(true);
 }
 
@@ -109,7 +109,7 @@ switch ($action) {
         $start = isset($_REQUEST['start']) ? api_strtotime($_REQUEST['start']) : null;
         $end = isset($_REQUEST['end']) ? api_strtotime($_REQUEST['end']) : null;
 
-        if ($type == 'personal' && !empty($sessionId)) {
+        if ('personal' == $type && !empty($sessionId)) {
             $agenda->setSessionId($sessionId);
         }
 
@@ -140,15 +140,15 @@ switch ($action) {
             }
             $today = getdate();
             $year = (!empty($_GET['year']) ? (int) $_GET['year'] : null);
-            if ($year == null) {
+            if (null == $year) {
                 $year = $today['year'];
             }
             $month = (!empty($_GET['month']) ? (int) $_GET['month'] : null);
-            if ($month == null) {
+            if (null == $month) {
                 $month = $today['mon'];
             }
             $day = (!empty($_GET['day']) ? (int) $_GET['day'] : null);
-            if ($day == null) {
+            if (null == $day) {
                 $day = $today['mday'];
             }
             $monthName = $MonthsLong[$month - 1];
@@ -169,7 +169,7 @@ switch ($action) {
                 "month_view"
             );
 
-            if (api_get_setting('allow_personal_agenda') == 'true') {
+            if ('true' == api_get_setting('allow_personal_agenda')) {
                 $agendaitems = Agenda::get_personal_agenda_items(
                     $user_id,
                     $agendaitems,
diff --git a/public/main/inc/ajax/announcement.ajax.php b/public/main/inc/ajax/announcement.ajax.php
index 5f44afcb92..19014b3d3e 100644
--- a/public/main/inc/ajax/announcement.ajax.php
+++ b/public/main/inc/ajax/announcement.ajax.php
@@ -4,7 +4,6 @@
 /**
  * Responses to AJAX calls.
  */
-
 use Chamilo\CoreBundle\Framework\Container;
 
 require_once __DIR__.'/../global.inc.php';
@@ -38,7 +37,7 @@ switch ($action) {
             $allowToEdit = $allowToEdit || api_is_drh();
         }
 
-        if ($allowToEdit === false && !empty($groupId)) {
+        if (false === $allowToEdit && !empty($groupId)) {
             $groupProperties = GroupManager::get_group_properties($groupId);
             // Check if user is tutor group
             $isTutor = GroupManager::is_tutor_of_group(api_get_user_id(), $groupProperties, $courseId);
@@ -47,12 +46,12 @@ switch ($action) {
             }
 
             // Last chance ... students can send announcements.
-            if ($groupProperties['announcements_state'] == GroupManager::TOOL_PRIVATE_BETWEEN_USERS) {
+            if (GroupManager::TOOL_PRIVATE_BETWEEN_USERS == $groupProperties['announcements_state']) {
                 $allowToEdit = true;
             }
         }
 
-        if ($allowToEdit === false) {
+        if (false === $allowToEdit) {
             exit;
         }
 
@@ -67,7 +66,7 @@ switch ($action) {
         $previewTotal = [];
         if (empty($groupId)) {
             if (empty($users) ||
-                (!empty($users) && isset($users[0]) && $users[0] == 'everyone')
+                (!empty($users) && isset($users[0]) && 'everyone' == $users[0])
             ) {
                 // All users in course session
                 if (empty($sessionId)) {
@@ -111,7 +110,7 @@ switch ($action) {
                 $sentToAllGroup = true;
             }
 
-            if ($sentToAllGroup === false) {
+            if (false === $sentToAllGroup) {
                 if (!empty($send_to_users['groups'])) {
                     foreach ($send_to_users['groups'] as $group) {
                         $previewGroups[] = $group;
@@ -126,7 +125,7 @@ switch ($action) {
             }
         }
 
-        if (isset($formParams['send_to_users_in_session']) && $formParams['send_to_users_in_session'] == 1) {
+        if (isset($formParams['send_to_users_in_session']) && 1 == $formParams['send_to_users_in_session']) {
             $sessionList = SessionManager::get_session_by_course(api_get_course_int_id());
 
             if (!empty($sessionList)) {
@@ -146,7 +145,7 @@ switch ($action) {
             }
         }
 
-        if (isset($formParams['send_to_hrm_users']) && $formParams['send_to_hrm_users'] == 1) {
+        if (isset($formParams['send_to_hrm_users']) && 1 == $formParams['send_to_hrm_users']) {
             foreach ($previewUsers as $userId) {
                 $userInfo = api_get_user_info($userId);
                 $drhList = UserManager::getDrhListFromUser($userId);
@@ -158,7 +157,7 @@ switch ($action) {
             }
         }
 
-        if (isset($formParams['send_me_a_copy_by_email']) && $formParams['send_me_a_copy_by_email'] == 1) {
+        if (isset($formParams['send_me_a_copy_by_email']) && 1 == $formParams['send_me_a_copy_by_email']) {
             $previewUsers[] = api_get_user_id();
         }
 
@@ -192,7 +191,7 @@ switch ($action) {
             if (empty($_REQUEST['id'])) {
                 return false;
             }
-            if (!empty($sessionId) && api_is_allowed_to_session_edit(false, true) == false && empty($groupId)) {
+            if (!empty($sessionId) && false == api_is_allowed_to_session_edit(false, true) && empty($groupId)) {
                 return false;
             }
 
diff --git a/public/main/inc/ajax/chat.ajax.php b/public/main/inc/ajax/chat.ajax.php
index 75ec3354f2..a64f22d1ec 100644
--- a/public/main/inc/ajax/chat.ajax.php
+++ b/public/main/inc/ajax/chat.ajax.php
@@ -10,14 +10,14 @@ require_once __DIR__.'/../global.inc.php';
 
 api_block_anonymous_users();
 
-if (api_get_setting('allow_global_chat') == 'false') {
+if ('false' == api_get_setting('allow_global_chat')) {
     exit;
 }
 
 $action = isset($_REQUEST['action']) ? $_REQUEST['action'] : '';
 
 // Course Chat
-if ($action === 'preview') {
+if ('preview' === $action) {
     echo CourseChatUtils::prepareMessage($_REQUEST['message']);
     exit;
 }
diff --git a/public/main/inc/ajax/course.ajax.php b/public/main/inc/ajax/course.ajax.php
index c51ec00474..4133e18a53 100644
--- a/public/main/inc/ajax/course.ajax.php
+++ b/public/main/inc/ajax/course.ajax.php
@@ -39,7 +39,7 @@ switch ($action) {
             // changed images that can have some weight
             $now = time() + 600; //time must be in GMT anyway
             $headers = [
-              'Expires' => gmdate('D, d M Y H:i:s ', $now) . 'GMT',
+              'Expires' => gmdate('D, d M Y H:i:s ', $now).'GMT',
               'Cache-Control' => 'max-age=600',
             ];
             DocumentManager::file_send_for_download($courseInfo[$image], null, null, null, $headers);
@@ -191,10 +191,10 @@ switch ($action) {
                 foreach ($results as $item) {
                     $item2 = [];
                     foreach ($item as $id => $internal) {
-                        if ($id == 'id') {
+                        if ('id' == $id) {
                             $item2[$id] = $internal;
                         }
-                        if ($id == 'title') {
+                        if ('title' == $id) {
                             $item2['text'] = $internal;
                         }
                     }
@@ -208,7 +208,7 @@ switch ($action) {
         break;
     case 'search_course_by_session_all':
         if (api_is_platform_admin()) {
-            if ($_GET['session_id'] == 'TODOS' || $_GET['session_id'] == 'T') {
+            if ('TODOS' == $_GET['session_id'] || 'T' == $_GET['session_id']) {
                 $_GET['session_id'] = '%';
             }
 
@@ -221,10 +221,10 @@ switch ($action) {
                 foreach ($results as $item) {
                     $item2 = [];
                     foreach ($item as $id => $internal) {
-                        if ($id == 'id') {
+                        if ('id' == $id) {
                             $item2[$id] = $internal;
                         }
-                        if ($id == 'title') {
+                        if ('title' == $id) {
                             $item2['text'] = $internal;
                         }
                     }
@@ -324,7 +324,7 @@ switch ($action) {
             );
             $result = Database::query($sql_query);
             while ($survey = Database::fetch_assoc($result)) {
-                $survey['title'] .= ($survey['anonymous'] == 1) ? ' ('.get_lang('Anonymous').')' : '';
+                $survey['title'] .= (1 == $survey['anonymous']) ? ' ('.get_lang('Anonymous').')' : '';
                 $data[] = [
                     'id' => $survey['id'],
                     'text' => strip_tags(html_entity_decode($survey['title'])),
diff --git a/public/main/inc/ajax/course_home.ajax.php b/public/main/inc/ajax/course_home.ajax.php
index b71f5bbb9c..1b65941db0 100644
--- a/public/main/inc/ajax/course_home.ajax.php
+++ b/public/main/inc/ajax/course_home.ajax.php
@@ -63,7 +63,7 @@ switch ($action) {
             $toolImage = $tool->getImage();
             $customIcon = $tool->getCustomIcon();
 
-            if (api_get_setting('homepage_view') != 'activity_big') {
+            if ('activity_big' != api_get_setting('homepage_view')) {
                 $toolImage = Display::return_icon(
                     $toolImage,
                     null,
@@ -92,13 +92,13 @@ switch ($action) {
                 $inactiveImage = CourseHome::getCustomWebIconPath().CourseHome::getDisableIcon($customIcon);
             }
 
-            $requested_image = $visibility == 0 ? $toolImage : $inactiveImage;
-            $requested_class = $visibility == 0 ? '' : 'text-muted';
-            $requested_message = $visibility == 0 ? 'is_active' : 'is_inactive';
-            $requested_view = $visibility == 0 ? 'visible.png' : 'invisible.png';
-            $requestedVisible = $visibility == 0 ? 1 : 0;
-            $requested_view = $visibility == 0 ? 'visible.png' : 'invisible.png';
-            $requestedVisible = $visibility == 0 ? 1 : 0;
+            $requested_image = 0 == $visibility ? $toolImage : $inactiveImage;
+            $requested_class = 0 == $visibility ? '' : 'text-muted';
+            $requested_message = 0 == $visibility ? 'is_active' : 'is_inactive';
+            $requested_view = 0 == $visibility ? 'visible.png' : 'invisible.png';
+            $requestedVisible = 0 == $visibility ? 1 : 0;
+            $requested_view = 0 == $visibility ? 'visible.png' : 'invisible.png';
+            $requestedVisible = 0 == $visibility ? 1 : 0;
 
             // HIDE AND REACTIVATE TOOL
             if ($_GET['id'] == strval(intval($_GET['id']))) {
@@ -142,8 +142,8 @@ switch ($action) {
         $course_info = api_get_course_info($_GET['code']);
         $content = get_lang('No description');
         if (!empty($course_info)) {
-            if (api_get_setting('course_catalog_hide_private') === 'true' &&
-                $course_info['visibility'] == COURSE_VISIBILITY_REGISTERED
+            if ('true' === api_get_setting('course_catalog_hide_private') &&
+                COURSE_VISIBILITY_REGISTERED == $course_info['visibility']
             ) {
                 echo get_lang('Private access');
                 break;
@@ -215,7 +215,7 @@ switch ($action) {
                 $temp[$count]['id'] = $lp_id;
 
                 $lp = new learnpath($item['code'], $lp_id, api_get_user_id());
-                if ($lp->progress_db == 100) {
+                if (100 == $lp->progress_db) {
                     continue;
                 }
 
diff --git a/public/main/inc/ajax/exercise.ajax.php b/public/main/inc/ajax/exercise.ajax.php
index d00df5344e..401588fa6a 100644
--- a/public/main/inc/ajax/exercise.ajax.php
+++ b/public/main/inc/ajax/exercise.ajax.php
@@ -83,7 +83,7 @@ switch ($action) {
             exit;
         }
 
-        if ($attempt->getStatus() != 'incomplete') {
+        if ('incomplete' != $attempt->getStatus()) {
             if ($debug) {
                 error_log('Cannot update exercise is already completed.');
             }
@@ -458,7 +458,7 @@ switch ($action) {
             }
 
             // Updating Reminder algorithm.
-            if ($objExercise->type == ONE_PER_PAGE) {
+            if (ONE_PER_PAGE == $objExercise->type) {
                 $bd_reminder_list = explode(',', $exercise_stat_info['questions_to_check']);
                 if (empty($remind_list)) {
                     $remind_list = $bd_reminder_list;
@@ -493,7 +493,7 @@ switch ($action) {
 
             // Getting the total weight if the request is simple
             $total_weight = 0;
-            if ($type == 'simple') {
+            if ('simple' == $type) {
                 foreach ($question_list as $my_question_id) {
                     $objQuestionTmp = Question::read($my_question_id, $objExercise->course);
                     $total_weight += $objQuestionTmp->selectWeighting();
@@ -507,7 +507,7 @@ switch ($action) {
                     error_log("Saving question_id = $my_question_id ");
                 }
 
-                if ($type == 'simple' && $question_id != $my_question_id) {
+                if ('simple' == $type && $question_id != $my_question_id) {
                     continue;
                 }
 
@@ -521,20 +521,20 @@ switch ($action) {
                 $objQuestionTmp = Question::read($my_question_id, $objExercise->course);
 
                 $myChoiceDegreeCertainty = null;
-                if ($objQuestionTmp->type === MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
+                if (MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY === $objQuestionTmp->type) {
                     if (isset($choiceDegreeCertainty[$my_question_id])) {
                         $myChoiceDegreeCertainty = $choiceDegreeCertainty[$my_question_id];
                     }
                 }
 
                 // Getting free choice data.
-                if (in_array($objQuestionTmp->type, [FREE_ANSWER, ORAL_EXPRESSION]) && $type == 'all') {
+                if (in_array($objQuestionTmp->type, [FREE_ANSWER, ORAL_EXPRESSION]) && 'all' == $type) {
                     $my_choice = isset($_REQUEST['free_choice'][$my_question_id]) && !empty($_REQUEST['free_choice'][$my_question_id])
                         ? $_REQUEST['free_choice'][$my_question_id]
                         : null;
                 }
 
-                if ($type == 'all') {
+                if ('all' == $type) {
                     $total_weight += $objQuestionTmp->selectWeighting();
                 }
 
@@ -546,7 +546,7 @@ switch ($action) {
                     $hotspot_delineation_result = $_SESSION['hotspot_delineation_result'][$objExercise->selectId()][$my_question_id];
                 }
 
-                if ($type === 'simple') {
+                if ('simple' === $type) {
                     // Getting old attempt in order to decrees the total score.
                     $old_result = $objExercise->manage_answer(
                         $exeId,
@@ -575,7 +575,7 @@ switch ($action) {
                         $session_id,
                         $my_question_id
                     );
-                    if ($objQuestionTmp->type === HOT_SPOT) {
+                    if (HOT_SPOT === $objQuestionTmp->type) {
                         Event::delete_attempt_hotspot(
                             $exeId,
                             api_get_user_id(),
@@ -593,7 +593,7 @@ switch ($action) {
                 }
 
                 // We're inside *one* question. Go through each possible answer for this question
-                if ($objQuestionTmp->type === MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
+                if (MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY === $objQuestionTmp->type) {
                     $myChoiceTmp = [];
                     $myChoiceTmp['choice'] = $my_choice;
                     $myChoiceTmp['choiceDegreeCertainty'] = $myChoiceDegreeCertainty;
@@ -634,7 +634,7 @@ switch ($action) {
 
                 $duration = 0;
                 $now = time();
-                if ($type == 'all') {
+                if ('all' == $type) {
                     $exercise_stat_info = $objExercise->get_stat_track_exercise_info_by_exe_id($exeId);
                 }
 
@@ -688,12 +688,12 @@ switch ($action) {
             }
         }
 
-        if ($type == 'all') {
+        if ('all' == $type) {
             echo 'ok';
             exit;
         }
 
-        if ($objExercise->type == ONE_PER_PAGE) {
+        if (ONE_PER_PAGE == $objExercise->type) {
             if ($debug) {
                 error_log("result: one_per_page");
                 error_log(" ------ end ajax call ------- ");
@@ -731,7 +731,7 @@ switch ($action) {
         }
         echo $id;
         echo '<p class="lead">'.$objQuestion->get_question_type_name().'</p>';
-        if ($objQuestion->type === FILL_IN_BLANKS) {
+        if (FILL_IN_BLANKS === $objQuestion->type) {
             echo '<script>
                 $(function() {
                     $(".selectpicker").selectpicker({});
@@ -740,7 +740,7 @@ switch ($action) {
         }
 
         // Allows render MathJax elements in a ajax call
-        if (api_get_setting('include_asciimathml_script') === 'true') {
+        if ('true' === api_get_setting('include_asciimathml_script')) {
             echo '<script> MathJax.Hub.Queue(["Typeset",MathJax.Hub]);</script>';
         }
 
diff --git a/public/main/inc/ajax/forum.ajax.php b/public/main/inc/ajax/forum.ajax.php
index 6c5158b4b2..74b2c927f6 100644
--- a/public/main/inc/ajax/forum.ajax.php
+++ b/public/main/inc/ajax/forum.ajax.php
@@ -6,8 +6,6 @@ use Chamilo\CourseBundle\Entity\CForumPost;
 /**
  * Responses to AJAX calls for forum attachments.
  *
- * @package chamilo/forum
- *
  * @author Daniel Barreto Alva <daniel.barreto@beeznest.com>
  */
 require_once __DIR__.'/../global.inc.php';
@@ -40,8 +38,8 @@ if (!empty($action)) {
                 // They are several pieces for clarity.
                 if (!api_is_allowed_to_edit(null, true) &&
                     (
-                        ($current_forum_category && $current_forum_category['visibility'] == 0) ||
-                        $current_forum['visibility'] == 0
+                        ($current_forum_category && 0 == $current_forum_category['visibility']) ||
+                        0 == $current_forum['visibility']
                     )
                 ) {
                     $json['errorMessage'] = '1. the forum category, forum or thread is invisible (visibility==0)';
@@ -49,14 +47,14 @@ if (!empty($action)) {
                 }
                 if (!api_is_allowed_to_edit(null, true) &&
                     (
-                        ($current_forum_category && $current_forum_category['locked'] != 0) ||
-                        $current_forum['locked'] != 0 || $current_thread['locked'] != 0
+                        ($current_forum_category && 0 != $current_forum_category['locked']) ||
+                        0 != $current_forum['locked'] || 0 != $current_thread['locked']
                     )
                 ) {
                     $json['errorMessage'] = '2. the forum category, forum or thread is locked (locked <>0)';
                     break;
                 }
-                if (api_is_anonymous() && $current_forum['allow_anonymous'] == 0) {
+                if (api_is_anonymous() && 0 == $current_forum['allow_anonymous']) {
                     $json['errorMessage'] = '3. if anonymous posts are not allowed';
                     break;
                 }
@@ -77,7 +75,7 @@ if (!empty($action)) {
                 ) {
                     // Save forum attachment
                     $attachId = add_forum_attachment_file('', $postId);
-                    if ($attachId !== false) {
+                    if (false !== $attachId) {
                         // Get prepared array of attachment data
                         $array = getAttachedFiles(
                             $forumId,
@@ -114,8 +112,8 @@ if (!empty($action)) {
                 // They are several pieces for clarity.
                 if (!api_is_allowed_to_edit(null, true) &&
                     (
-                        ($current_forum_category && $current_forum_category['visibility'] == 0) ||
-                        $current_forum['visibility'] == 0
+                        ($current_forum_category && 0 == $current_forum_category['visibility']) ||
+                        0 == $current_forum['visibility']
                     )
                 ) {
                     $json['errorMessage'] = '1. the forum category, forum or thread is invisible (visibility==0)';
@@ -123,21 +121,21 @@ if (!empty($action)) {
                 }
                 if (!api_is_allowed_to_edit(null, true) &&
                     (
-                        ($current_forum_category && $current_forum_category['locked'] != 0) ||
-                        $current_forum['locked'] != 0 || $current_thread['locked'] != 0
+                        ($current_forum_category && 0 != $current_forum_category['locked']) ||
+                        0 != $current_forum['locked'] || 0 != $current_thread['locked']
                     )
                 ) {
                     $json['errorMessage'] = '2. the forum category, forum or thread is locked (locked <>0)';
                     break;
                 }
-                if (api_is_anonymous() && $current_forum['allow_anonymous'] == 0) {
+                if (api_is_anonymous() && 0 == $current_forum['allow_anonymous']) {
                     $json['errorMessage'] = '3. if anonymous posts are not allowed';
                     break;
                 }
                 $group_id = api_get_group_id();
                 $groupInfo = GroupManager::get_group_properties($group_id);
                 if (!api_is_allowed_to_edit(null, true) &&
-                    $current_forum['allow_edit'] == 0 &&
+                    0 == $current_forum['allow_edit'] &&
                     ($group_id && !GroupManager::is_tutor_of_group(api_get_user_id(), $groupInfo))
                 ) {
                     $json['errorMessage'] = '4. if editing of replies is not allowed';
diff --git a/public/main/inc/ajax/install.ajax.php b/public/main/inc/ajax/install.ajax.php
index f19ad2fe2c..daf5c06ffe 100644
--- a/public/main/inc/ajax/install.ajax.php
+++ b/public/main/inc/ajax/install.ajax.php
@@ -28,7 +28,7 @@ switch ($action) {
             $a_required_fields = [$person_name, $person_role, $company_name, $company_activity, $company_country];
             $required_field_error = false;
             foreach ($a_required_fields as $required_file) {
-                if (trim($required_file) === '') {
+                if ('' === trim($required_file)) {
                     $required_field_error = true;
                     break;
                 }
@@ -51,7 +51,7 @@ switch ($action) {
                 try {
                     $client = new GuzzleHttp\Client();
                     $res = $client->request('GET', $url, $options);
-                    if ($res->getStatusCode() == '200' || $res->getStatusCode() == '301') {
+                    if ('200' == $res->getStatusCode() || '301' == $res->getStatusCode()) {
                         $urlValidated = true;
                     }
                 } catch (Exception $e) {
@@ -74,7 +74,7 @@ switch ($action) {
                 $client = new GuzzleHttp\Client();
                 $options['query'] = $data;
                 $res = $client->request('GET', $url, $options);
-                if ($res->getStatusCode() == '200') {
+                if ('200' == $res->getStatusCode()) {
                     echo '1';
                 }
             }
diff --git a/public/main/inc/ajax/lp.ajax.php b/public/main/inc/ajax/lp.ajax.php
index 86ef054dca..caeee2dfb0 100644
--- a/public/main/inc/ajax/lp.ajax.php
+++ b/public/main/inc/ajax/lp.ajax.php
@@ -30,7 +30,7 @@ switch ($action) {
         }
         $lpId = isset($_GET['lp_id']) ? $_GET['lp_id'] : false;
         $url = isset($_GET['url']) ? $_GET['url'] : '';
-        $addMove = isset($_GET['add_move_button']) && $_GET['add_move_button'] == 1 ? true : false;
+        $addMove = isset($_GET['add_move_button']) && 1 == $_GET['add_move_button'] ? true : false;
 
         echo DocumentManager::get_document_preview(
             $courseInfo,
@@ -148,7 +148,7 @@ switch ($action) {
         }
         break;
     case 'record_audio':
-        if (api_is_allowed_to_edit(null, true) == false) {
+        if (false == api_is_allowed_to_edit(null, true)) {
             exit;
         }
         /** @var Learnpath $lp */
diff --git a/public/main/inc/ajax/message.ajax.php b/public/main/inc/ajax/message.ajax.php
index b6f2f694ed..d6b2e00e4d 100644
--- a/public/main/inc/ajax/message.ajax.php
+++ b/public/main/inc/ajax/message.ajax.php
@@ -16,7 +16,7 @@ switch ($action) {
     case 'get_notifications_inbox':
         $userId = api_get_user_id();
         $listInbox = [];
-        if (api_get_setting('allow_message_tool') == 'true') {
+        if ('true' == api_get_setting('allow_message_tool')) {
             $list = MessageManager::getMessageData(
                 0,
                 10,
@@ -41,7 +41,7 @@ switch ($action) {
         $userId = api_get_user_id();
         $listInvitations = [];
         $temp = [];
-        if (api_get_setting('allow_social_tool') == 'true') {
+        if ('true' == api_get_setting('allow_social_tool')) {
             $list = SocialManager::get_list_invitation_of_friends_by_user_id($userId, 3);
 
             foreach ($list as $row) {
@@ -64,12 +64,12 @@ switch ($action) {
         $invitations = [];
         // Setting notifications
         $count_unread_message = 0;
-        if (api_get_setting('allow_message_tool') === 'true') {
+        if ('true' === api_get_setting('allow_message_tool')) {
             // get count unread message and total invitations
             $count_unread_message = MessageManager::getCountNewMessagesFromDB($userId);
         }
 
-        if (api_get_setting('allow_social_tool') === 'true') {
+        if ('true' === api_get_setting('allow_social_tool')) {
             $number_of_new_messages_of_friend = SocialManager::get_message_number_invitation_by_user_id(
                 $userId
             );
@@ -155,7 +155,7 @@ switch ($action) {
             $_REQUEST['page_limit']
         );
 
-        $showEmail = api_get_setting('show_email_addresses') === 'true';
+        $showEmail = 'true' === api_get_setting('show_email_addresses');
         $return = ['items' => []];
 
         /** @var User $user */
diff --git a/public/main/inc/ajax/model.ajax.php b/public/main/inc/ajax/model.ajax.php
index 95d8ec81ee..825957c0ac 100644
--- a/public/main/inc/ajax/model.ajax.php
+++ b/public/main/inc/ajax/model.ajax.php
@@ -25,12 +25,12 @@ $sidx = $_REQUEST['sidx']; //index (field) to filter
 $sord = $_REQUEST['sord']; //asc or desc
 $exportFilename = isset($_REQUEST['export_filename']) ? $_REQUEST['export_filename'] : '';
 
-if (strpos(strtolower($sidx), 'asc') !== false) {
+if (false !== strpos(strtolower($sidx), 'asc')) {
     $sidx = str_replace(['asc', ','], '', $sidx);
     $sord = 'asc';
 }
 
-if (strpos(strtolower($sidx), 'desc') !== false) {
+if (false !== strpos(strtolower($sidx), 'desc')) {
     $sidx = str_replace(['desc', ','], '', $sidx);
     $sord = 'desc';
 }
@@ -68,7 +68,7 @@ if (!in_array(
 ) && !isset($_REQUEST['from_course_session'])) {
     api_protect_admin_script(true);
 } elseif (isset($_REQUEST['from_course_session']) &&
-    $_REQUEST['from_course_session'] == 1
+    1 == $_REQUEST['from_course_session']
 ) {
     api_protect_teacher_script(true);
 }
@@ -108,13 +108,13 @@ function getWhereClause($col, $oper, $val)
         return '';
     }
 
-    if ($oper == 'bw' || $oper == 'bn') {
+    if ('bw' == $oper || 'bn' == $oper) {
         $val .= '%';
     }
-    if ($oper == 'ew' || $oper == 'en') {
+    if ('ew' == $oper || 'en' == $oper) {
         $val = '%'.$val;
     }
-    if ($oper == 'cn' || $oper == 'nc' || $oper == 'in' || $oper == 'ni') {
+    if ('cn' == $oper || 'nc' == $oper || 'in' == $oper || 'ni' == $oper) {
         $val = '%'.$val.'%';
     }
     $val = Database::escape_string($val);
@@ -140,7 +140,7 @@ if (!empty($search)) {
     $search = 'true';
 }
 
-if (($search || $forceSearch) && ($search !== 'false')) {
+if (($search || $forceSearch) && ('false' !== $search)) {
     $whereCondition = ' 1 = 1 ';
     $whereConditionInForm = getWhereClause(
         $searchField,
@@ -177,11 +177,11 @@ if (($search || $forceSearch) && ($search !== 'false')) {
                     if (empty($data)) {
                         continue;
                     }
-                    if ($data->field === 'extra_access_start_date') {
+                    if ('extra_access_start_date' === $data->field) {
                         $accessStartDate = $data->data;
                     }
 
-                    if ($data->field === 'extra_access_end_date') {
+                    if ('extra_access_end_date' === $data->field) {
                         $accessEndDate = $data->data;
                     }
 
@@ -391,7 +391,7 @@ switch ($action) {
             $userIdList = array_column($userIdList, 'user_id');
 
             //get students session courses
-            if ($sessionId == -1) {
+            if (-1 == $sessionId) {
                 $sessionList = SessionManager::get_sessions_list();
                 $sessionIdList = array_column($sessionList, 'id');
 
@@ -423,7 +423,7 @@ switch ($action) {
             $userIdList = array_column($userIdList, 'user_id');
 
             //get students session courses
-            if ($sessionId == -1) {
+            if (-1 == $sessionId) {
                 $sessionList = SessionManager::get_sessions_list();
                 $sessionIdList = array_column($sessionList, 'id');
 
@@ -484,7 +484,7 @@ switch ($action) {
             break;
         }
 
-        if ($action == 'get_user_course_report') {
+        if ('get_user_course_report' == $action) {
             $count = CourseManager::get_count_user_list_from_course_code(
                 false,
                 null,
@@ -537,7 +537,7 @@ switch ($action) {
         $courseInfo = api_get_course_info();
         $documents = getAllDocumentToWork($work_id, api_get_course_int_id());
 
-        if (trim($whereCondition) === '1 = 1') {
+        if ('1 = 1' === trim($whereCondition)) {
             $whereCondition = '';
         }
 
@@ -628,7 +628,7 @@ switch ($action) {
         if (!empty($courseId)) {
             $courseInfo = api_get_course_info_by_id($courseId);
         } else {
-            $courseId= isset($_REQUEST['cid']) ? $_REQUEST['cid'] : '';
+            $courseId = isset($_REQUEST['cid']) ? $_REQUEST['cid'] : '';
             if (!empty($courseId)) {
                 $courseInfo = api_get_course_info_by_id($courseId);
             }
@@ -652,7 +652,7 @@ switch ($action) {
 
         $description = '';
         $setting = api_get_setting('show_session_description');
-        if ($setting === 'true') {
+        if ('true' === $setting) {
             $description = $keyword;
         }
 
@@ -686,7 +686,7 @@ switch ($action) {
         break;
     case 'get_sessions':
         $list_type = isset($_REQUEST['list_type']) ? $_REQUEST['list_type'] : 'simple';
-        if ($list_type === 'simple') {
+        if ('simple' === $list_type) {
             $count = SessionManager::formatSessionsAdminForGrid(
                 ['where' => $whereCondition, 'extra' => $extra_fields],
                 true
@@ -847,7 +847,7 @@ if ($start < 0) {
 }
 
 //4. Deleting an element if the user wants to
-if (isset($_REQUEST['oper']) && $_REQUEST['oper'] == 'del') {
+if (isset($_REQUEST['oper']) && 'del' == $_REQUEST['oper']) {
     $obj->delete($_REQUEST['id']);
 }
 
@@ -863,7 +863,7 @@ switch ($action) {
         break;
     case 'get_usergroups_users':
         $columns = ['name', 'actions'];
-        if (api_get_plugin_setting('learning_calendar', 'enabled') === 'true') {
+        if ('true' === api_get_plugin_setting('learning_calendar', 'enabled')) {
             $columns = [
                 'name',
                 'calendar',
@@ -911,7 +911,7 @@ switch ($action) {
         );
         if ($result) {
             foreach ($result as &$item) {
-                $item['sent'] = $item['sent'] == 1 ? get_lang('Yes') : get_lang('No');
+                $item['sent'] = 1 == $item['sent'] ? get_lang('Yes') : get_lang('No');
                 $item['date'] = api_get_local_time($item['date']);
             }
         }
@@ -972,7 +972,7 @@ switch ($action) {
 
         if (!empty($extra_fields)) {
             foreach ($extra_fields as $extra) {
-                if ($extra['1'] == 'ruc') {
+                if ('ruc' == $extra['1']) {
                     continue;
                 }
                 $columns[] = $extra['1'];
@@ -1215,7 +1215,7 @@ switch ($action) {
         if (api_get_configuration_value('allow_compilatio_tool')) {
             $plagiarismColumns = ['compilatio'];
         }
-        if (isset($_GET['type']) && $_GET['type'] === 'simple') {
+        if (isset($_GET['type']) && 'simple' === $_GET['type']) {
             $columns = [
                 'fullname',
                 'title',
@@ -1255,7 +1255,7 @@ switch ($action) {
             $plagiarismColumns = ['compilatio'];
         }
 
-        if (isset($_GET['type']) && $_GET['type'] === 'simple') {
+        if (isset($_GET['type']) && 'simple' === $_GET['type']) {
             $columns = [
                 'type', 'firstname', 'lastname', 'title', 'qualification', 'sent_date', 'qualificator_id',
             ];
@@ -1267,7 +1267,7 @@ switch ($action) {
             $columns[] = 'actions';
         }
 
-        if (trim($whereCondition) === '1 = 1') {
+        if ('1 = 1' === trim($whereCondition)) {
             $whereCondition = '';
         }
 
@@ -1286,7 +1286,7 @@ switch ($action) {
         if (api_get_configuration_value('allow_compilatio_tool')) {
             $plagiarismColumns = ['compilatio'];
         }
-        if (isset($_GET['type']) && $_GET['type'] == 'simple') {
+        if (isset($_GET['type']) && 'simple' == $_GET['type']) {
             $columns = [
                 'type', 'title', 'qualification', 'sent_date', 'qualificator_id',
             ];
@@ -1299,7 +1299,7 @@ switch ($action) {
         }
         $documents = getAllDocumentToWork($work_id, api_get_course_int_id());
 
-        if (trim($whereCondition) === '1 = 1') {
+        if ('1 = 1' === trim($whereCondition)) {
             $whereCondition = '';
         }
 
@@ -1346,7 +1346,7 @@ switch ($action) {
                 'actions',
             ];
             $officialCodeInList = api_get_setting('show_official_code_exercise_result_list');
-            if ($officialCodeInList === 'true') {
+            if ('true' === $officialCodeInList) {
                 $columns = array_merge(['official_code'], $columns);
             }
         }
@@ -1388,7 +1388,7 @@ switch ($action) {
         $columns[] = 'exe_date';
         $columns[] = 'score';
 
-        if ($operation === 'excel') {
+        if ('excel' === $operation) {
             $columns = [
                 'firstname',
                 'lastname',
@@ -1417,7 +1417,7 @@ switch ($action) {
         if (!empty($categoryList)) {
             foreach ($categoryList as $categoryInfo) {
                 $label = 'category_'.$categoryInfo['id'];
-                if ($operation == 'excel') {
+                if ('excel' == $operation) {
                     $columns[] = $label.'_score_percentage';
                     $columns[] = $label.'_only_score';
                     $columns[] = $label.'_total';
@@ -1434,7 +1434,7 @@ switch ($action) {
             }
         }
 
-        if ($operation !== 'excel') {
+        if ('excel' !== $operation) {
             $columns[] = 'actions';
         }
 
@@ -1577,7 +1577,7 @@ switch ($action) {
         $session_columns = SessionManager::getGridColumns($list_type);
         $columns = $session_columns['simple_column_name'];
 
-        if ($list_type == 'simple') {
+        if ('simple' == $list_type) {
             $result = SessionManager::formatSessionsAdminForGrid(
                 [
                     'where' => $whereCondition,
@@ -1853,7 +1853,7 @@ switch ($action) {
         );
         $new_result = [];
         foreach ($result as $item) {
-            if ($item['parent_id'] != 0) {
+            if (0 != $item['parent_id']) {
                 continue;
             }
             $skills = $obj->getSkillsByGradebook($item['id']);
@@ -2111,7 +2111,7 @@ switch ($action) {
             $finalScore = 0;
             foreach ($quizIds as $quizID) {
                 $grade = '';
-                if (!empty($arrGrade[$user['user_id']][$quizID]) || $arrGrade[$user['user_id']][$quizID] == 0) {
+                if (!empty($arrGrade[$user['user_id']][$quizID]) || 0 == $arrGrade[$user['user_id']][$quizID]) {
                     $finalScore += $grade = $arrGrade[$user['user_id']][$quizID];
                 }
                 $result[$i]['exer'.$j] = $grade;
@@ -2257,7 +2257,7 @@ if (in_array($action, $allowed_actions)) {
     $response->total = $total_pages;
     $response->records = $count;
 
-    if ($operation && $operation == 'excel') {
+    if ($operation && 'excel' == $operation) {
         $j = 1;
         $array = [];
         if (empty($column_names)) {
@@ -2305,7 +2305,7 @@ if (in_array($action, $allowed_actions)) {
         foreach ($result as $row) {
             // if results tab give not id, set id to $i otherwise id="null"
             // for all <tr> of the jqgrid - ref #4235
-            if (!isset($row['id']) || isset($row['id']) && $row['id'] == '') {
+            if (!isset($row['id']) || isset($row['id']) && '' == $row['id']) {
                 $response->rows[$i]['id'] = $i;
             } else {
                 $response->rows[$i]['id'] = $row['id'];
diff --git a/public/main/inc/ajax/myspace.ajax.php b/public/main/inc/ajax/myspace.ajax.php
index 6085f46ccb..1ac50d95bd 100644
--- a/public/main/inc/ajax/myspace.ajax.php
+++ b/public/main/inc/ajax/myspace.ajax.php
@@ -25,7 +25,7 @@ switch ($action) {
         $sessionId = isset($_REQUEST['session_id']) ? $_REQUEST['session_id'] : 0;
         $courseInfo = api_get_course_info($course_code);
 
-        if ($range == 1) {
+        if (1 == $range) {
             $start_date = Security::remove_XSS($_REQUEST['sd']);
             $end_date = Security::remove_XSS($_REQUEST['ed']);
             $sql_result = MySpace::get_connections_to_course_by_date(
diff --git a/public/main/inc/ajax/record_audio_rtc.ajax.php b/public/main/inc/ajax/record_audio_rtc.ajax.php
index 78abda784c..cb22d4d7b3 100644
--- a/public/main/inc/ajax/record_audio_rtc.ajax.php
+++ b/public/main/inc/ajax/record_audio_rtc.ajax.php
@@ -13,14 +13,14 @@ $courseInfo = api_get_course_info();
 $tool = isset($_REQUEST['tool']) ? $_REQUEST['tool'] : '';
 $type = isset($_REQUEST['type']) ? $_REQUEST['type'] : 'document'; // can be document or message
 
-if ($type == 'document') {
+if ('document' == $type) {
     api_protect_course_script();
 }
 
 $userId = api_get_user_id();
 
 if (!isset($_FILES['audio_blob'], $_REQUEST['audio_dir'])) {
-    if ($tool === 'exercise') {
+    if ('exercise' === $tool) {
         header('Content-Type: application/json');
         echo json_encode([
             'error' => true,
@@ -77,7 +77,7 @@ switch ($type) {
 
             $data = DocumentManager::get_document_data_by_id($newDocId, $courseInfo['code']);
 
-            if ($tool === 'exercise') {
+            if ('exercise' === $tool) {
                 header('Content-Type: application/json');
                 echo json_encode([
                     'error' => $error,
diff --git a/public/main/inc/ajax/record_audio_wami.ajax.php b/public/main/inc/ajax/record_audio_wami.ajax.php
index fdcc1ef01b..53a35eb919 100644
--- a/public/main/inc/ajax/record_audio_wami.ajax.php
+++ b/public/main/inc/ajax/record_audio_wami.ajax.php
@@ -29,7 +29,7 @@ if (empty($wamiuserid)) {
 
 $type = isset($_REQUEST['type']) ? $_REQUEST['type'] : 'document'; // can be document or message
 
-if ($type === 'document') {
+if ('document' === $type) {
     api_protect_course_script();
 }
 
@@ -48,7 +48,7 @@ if (empty($content)) {
 $ext = explode('.', $waminame);
 $ext = strtolower($ext[sizeof($ext) - 1]);
 
-if ($ext != 'wav') {
+if ('wav' != $ext) {
     die();
 }
 
diff --git a/public/main/inc/ajax/sequence.ajax.php b/public/main/inc/ajax/sequence.ajax.php
index b867948851..6edddf4b14 100644
--- a/public/main/inc/ajax/sequence.ajax.php
+++ b/public/main/inc/ajax/sequence.ajax.php
@@ -399,7 +399,7 @@ switch ($action) {
                     $type
                 );
 
-                if (count($sequences) === 0) {
+                if (0 === count($sequences)) {
                     break;
                 }
 
diff --git a/public/main/inc/ajax/session.ajax.php b/public/main/inc/ajax/session.ajax.php
index 058686b909..ce6e896598 100644
--- a/public/main/inc/ajax/session.ajax.php
+++ b/public/main/inc/ajax/session.ajax.php
@@ -87,10 +87,10 @@ switch ($action) {
                 foreach ($results as $item) {
                     $item2 = [];
                     foreach ($item as $id => $internal) {
-                        if ($id == 'id') {
+                        if ('id' == $id) {
                             $item2[$id] = $internal;
                         }
-                        if ($id == 'name') {
+                        if ('name' == $id) {
                             $item2['text'] = $internal;
                         }
                     }
@@ -120,10 +120,10 @@ switch ($action) {
                 foreach ($results as $item) {
                     $item2 = [];
                     foreach ($item as $id => $internal) {
-                        if ($id == 'id') {
+                        if ('id' == $id) {
                             $item2[$id] = $internal;
                         }
-                        if ($id == 'name') {
+                        if ('name' == $id) {
                             $item2['text'] = $internal;
                         }
                     }
@@ -169,7 +169,7 @@ switch ($action) {
             $sessionInfo = api_get_session_info($_GET['session']);
             echo '<h2>'.$sessionInfo['name'].'</h2>';
             echo '<div class="home-course-intro"><div class="page-course"><div class="page-course-intro">';
-            echo $sessionInfo['show_description'] == 1 ? $sessionInfo['description'] : get_lang('none');
+            echo 1 == $sessionInfo['show_description'] ? $sessionInfo['description'] : get_lang('none');
             echo '</div></div></div>';
         }
         break;
@@ -305,7 +305,7 @@ switch ($action) {
             $documentAndFolders = array_filter(
                 $documentAndFolders,
                 function (array $documentData) {
-                    return $documentData['filetype'] != 'folder';
+                    return 'folder' != $documentData['filetype'];
                 }
             );
             $documentAndFolders = array_map(
@@ -413,7 +413,7 @@ switch ($action) {
             break;
         }
 
-        if ($documentInfo['filetype'] != 'link') {
+        if ('link' != $documentInfo['filetype']) {
             $deletedDocument = DocumentManager::delete_document(
                 $courseInfo,
                 null,
diff --git a/public/main/inc/ajax/skill.ajax.php b/public/main/inc/ajax/skill.ajax.php
index 0e672456c7..ff1fddbb4c 100644
--- a/public/main/inc/ajax/skill.ajax.php
+++ b/public/main/inc/ajax/skill.ajax.php
@@ -56,7 +56,7 @@ switch ($action) {
         //Only course gradebook with certificate
         if (!empty($gradebooks)) {
             foreach ($gradebooks as $gradebook) {
-                if ($gradebook['parent_id'] == 0 &&
+                if (0 == $gradebook['parent_id'] &&
                     !empty($gradebook['certif_min_score']) &&
                     !empty($gradebook['document_id'])
                 ) {
@@ -141,7 +141,7 @@ switch ($action) {
         break;
     case 'get_skills_tree_json':
         header('Content-Type: application/json');
-        $userId = isset($_REQUEST['load_user']) && $_REQUEST['load_user'] == 1 ? api_get_user_id() : 0;
+        $userId = isset($_REQUEST['load_user']) && 1 == $_REQUEST['load_user'] ? api_get_user_id() : 0;
         $skill_id = isset($_REQUEST['skill_id']) ? intval($_REQUEST['skill_id']) : 0;
         $depth = isset($_REQUEST['main_depth']) ? intval($_REQUEST['main_depth']) : 2;
         $all = $skill->getSkillsTreeToJson($userId, $skill_id, false, $depth);
diff --git a/public/main/inc/ajax/social.ajax.php b/public/main/inc/ajax/social.ajax.php
index 5c9295daf8..90ffa2da1a 100644
--- a/public/main/inc/ajax/social.ajax.php
+++ b/public/main/inc/ajax/social.ajax.php
@@ -74,7 +74,7 @@ switch ($action) {
         $user_id = api_get_user_id();
         $name_search = Security::remove_XSS($_POST['search_name_q']);
 
-        if (isset($name_search) && $name_search != 'undefined') {
+        if (isset($name_search) && 'undefined' != $name_search) {
             $friends = SocialManager::get_friends($user_id, null, $name_search);
         } else {
             $friends = SocialManager::get_friends($user_id);
@@ -83,7 +83,7 @@ switch ($action) {
         $friend_html = '';
         $number_of_images = 8;
         $number_friends = count($friends);
-        if ($number_friends != 0) {
+        if (0 != $number_friends) {
             $number_loop = $number_friends / $number_of_images;
             $loop_friends = ceil($number_loop);
             $j = 0;
@@ -144,7 +144,7 @@ switch ($action) {
                     //------Forum messages
                     $forum_result = get_all_post_from_user($user_id, $course_code);
                     $all_result_data = 0;
-                    if ($forum_result != '') {
+                    if ('' != $forum_result) {
                         echo '<div id="social-forum-main-title">';
                         echo api_xml_http_response_encode(get_lang('Forum'));
                         echo '</div>';
@@ -178,7 +178,7 @@ switch ($action) {
                         echo '<br />';
                         $all_result_data++;
                     }
-                    if ($all_result_data == 0) {
+                    if (0 == $all_result_data) {
                         echo api_xml_http_response_encode(get_lang('No data available'));
                     }
                 } else {
@@ -201,7 +201,7 @@ switch ($action) {
             exit;
         }
 
-        if (api_get_setting('allow_social_tool') !== 'true') {
+        if ('true' !== api_get_setting('allow_social_tool')) {
             exit;
         }
 
@@ -235,7 +235,7 @@ switch ($action) {
             exit;
         }
 
-        if (api_get_setting('allow_social_tool') !== 'true') {
+        if ('true' !== api_get_setting('allow_social_tool')) {
             exit;
         }
 
@@ -323,7 +323,7 @@ switch ($action) {
         $url = isset($_POST['social_wall_new_msg_main']) ? $_POST['social_wall_new_msg_main'] : '';
         $url = trim($url);
         $html = '';
-        if (SocialManager::verifyUrl($url) == true) {
+        if (true == SocialManager::verifyUrl($url)) {
             $html = Security::remove_XSS(
                 SocialManager::readContentWithOpenGraph($url)
             );
diff --git a/public/main/inc/ajax/statistics.ajax.php b/public/main/inc/ajax/statistics.ajax.php
index df29d8dcc0..a96be59e02 100644
--- a/public/main/inc/ajax/statistics.ajax.php
+++ b/public/main/inc/ajax/statistics.ajax.php
@@ -18,8 +18,8 @@ $order = isset($_REQUEST['sord']) && in_array($_REQUEST['sord'], ['asc', 'desc']
 
 switch ($action) {
     case 'add_student_to_boss':
-        $studentId =  isset($_GET['student_id']) ? (int) $_GET['student_id'] : 0;
-        $bossId =  isset($_GET['boss_id']) ? (int) $_GET['boss_id'] : 0;
+        $studentId = isset($_GET['student_id']) ? (int) $_GET['student_id'] : 0;
+        $bossId = isset($_GET['boss_id']) ? (int) $_GET['boss_id'] : 0;
 
         if ($studentId && $bossId) {
             UserManager::subscribeBossToUsers($bossId, [$studentId], false);
@@ -161,10 +161,10 @@ switch ($action) {
         // for global tools usage (number of clicks)
         $list = [];
         $palette = ChamiloApi::getColorPalette(true, true);
-        if ($action == 'tools_usage') {
+        if ('tools_usage' == $action) {
             $statsName = 'Tools';
             $all = Statistics::getToolsStats();
-        } elseif ($action == 'courses') {
+        } elseif ('courses' == $action) {
             $statsName = 'CountCours';
             $course_categories = Statistics::getCourseCategories();
             // total amount of courses
@@ -172,7 +172,7 @@ switch ($action) {
             foreach ($course_categories as $code => $name) {
                 $all[$name] = Statistics::countCourses($code);
             }
-        } elseif ($action == 'courses_by_language') {
+        } elseif ('courses_by_language' == $action) {
             $statsName = 'CountCourseByLanguage';
             $all = Statistics::printCourseByLanguageStats();
             // use slightly different colors than previous chart
@@ -180,14 +180,14 @@ switch ($action) {
                 $item = array_shift($palette);
                 array_push($palette, $item);
             }
-        } elseif ($action == 'users') {
+        } elseif ('users' == $action) {
             $statsName = 'NumberOfUsers';
             $countInvisible = isset($_GET['count_invisible']) ? (int) $_GET['count_invisible'] : null;
             $all = [
                 get_lang('Trainers') => Statistics::countUsers(COURSEMANAGER, null, $countInvisible),
                 get_lang('Learners') => Statistics::countUsers(STUDENT, null, $countInvisible),
             ];
-        } elseif ($action == 'users_teachers') {
+        } elseif ('users_teachers' == $action) {
             $statsName = 'Teachers';
             $course_categories = Statistics::getCourseCategories();
             $countInvisible = isset($_GET['count_invisible']) ? (int) $_GET['count_invisible'] : null;
@@ -201,7 +201,7 @@ switch ($action) {
                 $item = array_shift($palette);
                 array_push($palette, $item);
             }
-        } elseif ($action == 'users_students') {
+        } elseif ('users_students' == $action) {
             $statsName = 'Students';
             $course_categories = Statistics::getCourseCategories();
             $countInvisible = isset($_GET['count_invisible']) ? (int) $_GET['count_invisible'] : null;
@@ -302,7 +302,7 @@ switch ($action) {
                 foreach ($languages['folder'] as $language) {
                     $conditions = ['language' => $language];
                     $key = $language;
-                    if (substr($language, -1) === '2') {
+                    if ('2' === substr($language, -1)) {
                         $key = str_replace(2, '', $language);
                     }
                     if (!isset($all[$key])) {
@@ -571,7 +571,7 @@ switch ($action) {
                     if (!isset($all[$language])) {
                         $all[$language] = 0;
                     }
-                    $all[$language] += 1;
+                    $all[$language]++;
                 }
                 break;
         }
diff --git a/public/main/inc/ajax/thematic.ajax.php b/public/main/inc/ajax/thematic.ajax.php
index f891e441b4..12f9370390 100644
--- a/public/main/inc/ajax/thematic.ajax.php
+++ b/public/main/inc/ajax/thematic.ajax.php
@@ -126,7 +126,7 @@ switch ($action) {
                             break;
                         }
                     }
-                    if ($insert == true) {
+                    if (true == $insert) {
                         $input_select .= '<option '.$selected.' value="'.$calendar['date_time'].'">'.$calendar['date_time'].'</option>';
                     }
                 }
diff --git a/public/main/inc/ajax/user_manager.ajax.php b/public/main/inc/ajax/user_manager.ajax.php
index 4811ab4cef..4ca17c627e 100644
--- a/public/main/inc/ajax/user_manager.ajax.php
+++ b/public/main/inc/ajax/user_manager.ajax.php
@@ -48,7 +48,7 @@ switch ($action) {
 
         echo '<div class="col-sm-7">';
 
-        if (api_get_setting('show_email_addresses') == 'false') {
+        if ('false' == api_get_setting('show_email_addresses')) {
             $user_info['mail'] = ' ';
         } else {
             $user_info['mail'] = ' '.$user_info['mail'].' ';
@@ -62,7 +62,7 @@ switch ($action) {
         if ($isAnonymous) {
             // Only allow anonymous users to see user popup if the popup user
             // is a teacher (which might be necessary to illustrate a course)
-            if ($user_info['status'] === COURSEMANAGER) {
+            if (COURSEMANAGER === $user_info['status']) {
                 echo $userData;
             } else {
                 echo '<h3>-</h3>';
@@ -78,8 +78,8 @@ switch ($action) {
 
         $url = api_get_path(WEB_AJAX_PATH).'message.ajax.php?a=send_message&user_id='.$user_info['user_id'].'&course_id='.$courseId.'&session_id='.$sessionId;
 
-        if ($isAnonymous === false &&
-            api_get_setting('allow_message_tool') == 'true'
+        if (false === $isAnonymous &&
+            'true' == api_get_setting('allow_message_tool')
         ) {
             echo '<script>';
             echo '
@@ -177,7 +177,7 @@ switch ($action) {
                 $result = Database::query($sql);
 
                 // Send and email if account is active
-                if ($status == 1) {
+                if (1 == $status) {
                     $user_info = api_get_user_info($user_id);
                     $recipientName = api_get_person_name(
                         $user_info['firstname'],
diff --git a/public/main/inc/global.inc.php b/public/main/inc/global.inc.php
index 5c019c1852..de04e967f7 100644
--- a/public/main/inc/global.inc.php
+++ b/public/main/inc/global.inc.php
@@ -53,7 +53,7 @@ try {
     $context = Container::getRouter()->getContext();
 
     $pos = strpos($currentBaseUrl, 'main');
-    if ($pos === false) {
+    if (false === $pos) {
         echo 'Cannot load current URL';
         exit;
     }
diff --git a/public/main/inc/global_error_message.inc.php b/public/main/inc/global_error_message.inc.php
index c973d979d3..9489a8536e 100644
--- a/public/main/inc/global_error_message.inc.php
+++ b/public/main/inc/global_error_message.inc.php
@@ -4,8 +4,6 @@
 /**
  * This script displays error messages on fatal errors during initialization.
  *
- * @package chamilo.include
- *
  * @author Ivan Tcholakov, 2009-2010
  */
 $Organisation = '<a href="http://www.chamilo.org" target="_blank">Chamilo Homepage</a>';
@@ -84,7 +82,7 @@ if (is_int($global_error_code) && $global_error_code > 0) {
             $IncorrectPhpVersionDescription = str_replace('%s1', $php_version, $IncorrectPhpVersionDescription);
             $IncorrectPhpVersionDescription = str_replace('%s2', REQUIRED_PHP_VERSION, $IncorrectPhpVersionDescription);
             $pos = strpos($IncorrectPhpVersionDescription, '%s3');
-            if ($pos !== false) {
+            if (false !== $pos) {
                 $length = strlen($IncorrectPhpVersionDescription);
                 $read_installation_guide = substr($IncorrectPhpVersionDescription, $pos + 3, $length);
                 $IncorrectPhpVersionDescription = substr($IncorrectPhpVersionDescription, 0, $pos);
@@ -96,11 +94,11 @@ if (is_int($global_error_code) && $global_error_code > 0) {
             require __DIR__.'/../install/version.php';
             $global_error_message['section'] = $SectionInstallation;
             $global_error_message['title'] = $InstallationTitle;
-            if (($pos = strpos($InstallationDescription, '%s')) === false) {
+            if (false === ($pos = strpos($InstallationDescription, '%s'))) {
                 $InstallationDescription = 'Click to INSTALL Chamilo %s or read the installation guide';
             }
             $read_installation_guide = substr($InstallationDescription, $pos + 2);
-            $versionStatus = (!empty($new_version_status) && $new_version_status != 'stable' ? $new_version_status : '');
+            $versionStatus = (!empty($new_version_status) && 'stable' != $new_version_status ? $new_version_status : '');
             $InstallationDescription = '<form action="'.$root_rel.'main/install/index.php" method="get">
             <div class="row">
                     <div class="col-md-12">
@@ -136,7 +134,7 @@ if (is_int($global_error_code) && $global_error_code > 0) {
             break;
     }
 
-    $show_error_codes = defined('SHOW_ERROR_CODES') && SHOW_ERROR_CODES && $global_error_code != 2;
+    $show_error_codes = defined('SHOW_ERROR_CODES') && SHOW_ERROR_CODES && 2 != $global_error_code;
     $global_error_message['code'] = $show_error_codes ? $ErrorCode.': '.$global_error_code.'<br /><br />' : '';
     $global_error_message['details'] = empty($global_error_message['details']) ? '' : ($show_error_codes ? ': '.$global_error_message['details'] : $global_error_message['details']);
     $global_error_message['organisation'] = $Organisation;
@@ -148,7 +146,7 @@ if (is_int($global_error_code) && $global_error_code > 0) {
     $installChamiloImage = "data:image/png;base64,".base64_encode(file_get_contents("$root_sys/public/img/mr_chamilo_install.png"));
     $global_error_message['mr_chamilo'] = $installChamiloImage;
 
-    if ($global_error_code == 2) {
+    if (2 == $global_error_code) {
         $global_error_message_page =
 <<<EOM
 <!DOCTYPE html>
diff --git a/public/main/inc/introductionSection.inc.php b/public/main/inc/introductionSection.inc.php
index bc131e4a74..cf9a1edbeb 100644
--- a/public/main/inc/introductionSection.inc.php
+++ b/public/main/inc/introductionSection.inc.php
@@ -26,8 +26,6 @@ use Chamilo\CourseBundle\Entity\CToolIntro;
  *
  * This script is also used since Chamilo 1.9 to show course progress (from the
  * course_progress module)
- *
- * @package chamilo.include
  */
 $em = Database::getManager();
 $intro_editAllowed = $is_allowed_to_edit = api_is_allowed_to_edit();
@@ -175,25 +173,25 @@ if ($intro_dispForm) {
 $thematic_description_html = '';
 $thematicItemTwo = '';
 
-if ($tool == TOOL_COURSE_HOMEPAGE && !isset($_GET['intro_cmdEdit'])) {
+if (TOOL_COURSE_HOMEPAGE == $tool && !isset($_GET['intro_cmdEdit'])) {
     // Only show this if we're on the course homepage and we're not currently editing
     $thematic = new Thematic();
     $displayMode = api_get_course_setting('display_info_advance_inside_homecourse');
     $class1 = '';
-    if ($displayMode == '1') {
+    if ('1' == $displayMode) {
         // Show only the current course progress step
         $last_done_advance = $thematic->get_last_done_thematic_advance();
         $thematic_advance_info = $thematic->get_thematic_advance_list($last_done_advance);
         $subTitle1 = get_lang('Current topic');
         $class1 = ' current';
-    } elseif ($displayMode == '2') {
+    } elseif ('2' == $displayMode) {
         // Show only the two next course progress steps
         $last_done_advance = $thematic->get_next_thematic_advance_not_done();
         $next_advance_not_done = $thematic->get_next_thematic_advance_not_done(2);
         $thematic_advance_info = $thematic->get_thematic_advance_list($last_done_advance);
         $thematic_advance_info2 = $thematic->get_thematic_advance_list($next_advance_not_done);
         $subTitle1 = $subTitle2 = get_lang('Next topic');
-    } elseif ($displayMode == '3') {
+    } elseif ('3' == $displayMode) {
         // Show the current and next course progress steps
         $last_done_advance = $thematic->get_last_done_thematic_advance();
         $next_advance_not_done = $thematic->get_next_thematic_advance_not_done();
@@ -348,7 +346,7 @@ if ($intro_dispCommand) {
 
         // Fix for chrome XSS filter for videos in iframes - BT#7930
         $browser = api_get_navigator();
-        if (strpos($introduction_section, '<iframe') !== false && $browser['name'] == 'Chrome') {
+        if (false !== strpos($introduction_section, '<iframe') && 'Chrome' == $browser['name']) {
             header('X-XSS-Protection: 0');
         }
     }
@@ -356,7 +354,7 @@ if ($intro_dispCommand) {
 
 $nameSection = get_lang('Add an introduction to the course');
 $helpSection = get_lang('This course is already created! Now you can add a presentation or welcome text to your course in this section, ideal for your students.');
-if ($moduleId != 'course_homepage') {
+if ('course_homepage' != $moduleId) {
     $nameSection = get_lang('Add an introduction to the tool');
     $helpSection = get_lang('Add Custom Tools Intro');
 }
@@ -384,7 +382,7 @@ if ($intro_dispDefault) {
 
 $browser = api_get_navigator();
 
-if (strpos($introduction_section, '<iframe') !== false && $browser['name'] == 'Chrome') {
+if (false !== strpos($introduction_section, '<iframe') && 'Chrome' == $browser['name']) {
     header("X-XSS-Protection: 0");
 }
 $data = null;
diff --git a/public/main/inc/lib/AnnouncementEmail.php b/public/main/inc/lib/AnnouncementEmail.php
index 299cbaa023..38659554af 100644
--- a/public/main/inc/lib/AnnouncementEmail.php
+++ b/public/main/inc/lib/AnnouncementEmail.php
@@ -14,13 +14,12 @@ class AnnouncementEmail
     public $session_id;
     public $logger;
     protected $course;
-    /** @var CAnnouncement  */
+    /** @var CAnnouncement */
     protected $announcement;
 
     /**
      * @param array           $courseInfo
      * @param int             $sessionId
-     * @param CAnnouncement   $announcement
      * @param \Monolog\Logger $logger
      */
     public function __construct($courseInfo, $sessionId, CAnnouncement $announcement, $logger = null)
@@ -293,7 +292,7 @@ class AnnouncementEmail
         foreach ($users as $user) {
             $message = $this->message($user['user_id']);
             $wasSent = MessageManager::messageWasAlreadySent($senderId, $user['user_id'], $subject, $message);
-            if ($wasSent === false) {
+            if (false === $wasSent) {
                 if (!empty($this->logger)) {
                     $this->logger->addInfo(
                         'Announcement: #'.$this->announcement->getIid().'. Send email to user: #'.$user['user_id']
@@ -318,7 +317,7 @@ class AnnouncementEmail
                 }
             }
 
-            if (($counter % $batchSize) === 0) {
+            if (0 === ($counter % $batchSize)) {
                 $em->flush();
                 $em->clear();
             }
diff --git a/public/main/inc/lib/AnnouncementManager.php b/public/main/inc/lib/AnnouncementManager.php
index 1ea2160e9e..193c918f7b 100644
--- a/public/main/inc/lib/AnnouncementManager.php
+++ b/public/main/inc/lib/AnnouncementManager.php
@@ -171,7 +171,6 @@ class AnnouncementManager
 
         return $repo->findBy($criteria);
 
-
         $tbl_announcement = Database::get_course_table(TABLE_ANNOUNCEMENT);
         $tbl_item_property = Database::get_course_table(TABLE_ITEM_PROPERTY);
 
@@ -220,7 +219,7 @@ class AnnouncementManager
             $id,
             $session_id
         );
-        if ($item_visibility == '1') {
+        if ('1' == $item_visibility) {
             api_item_property_update(
                 $courseInfo,
                 TOOL_ANNOUNCEMENT,
@@ -252,7 +251,7 @@ class AnnouncementManager
         $repo = Container::getAnnouncementRepository();
         $criteria = [
             'cId' => $courseInfo['real_id'],
-            'id' =>$id
+            'id' => $id,
         ];
         $announcement = $repo->findOneBy($criteria);
         $repo->getEntityManager()->remove($announcement);
@@ -374,11 +373,11 @@ class AnnouncementManager
         } else {
             $groupList[] = $groupId;
 
-            if (api_get_user_id() != 0) {
+            if (0 != api_get_user_id()) {
                 $extraGroupCondition = '';
                 if (!empty($groupId)) {
                     $groupProperties = GroupManager::get_group_properties($groupId);
-                    if ($groupProperties['announcements_state'] == GroupManager::TOOL_PRIVATE_BETWEEN_USERS) {
+                    if (GroupManager::TOOL_PRIVATE_BETWEEN_USERS == $groupProperties['announcements_state']) {
                         $extraGroupCondition = " AND (
                             ip.toUser = $userId AND ip.group = $groupId OR
                             (ip.group IN ('0') OR ip.group IS NULL) OR
@@ -670,7 +669,7 @@ class AnnouncementManager
 
         // store in item_property (first the groups, then the users
         if (empty($sentTo) ||
-            (!empty($sentTo) && isset($sentTo[0]) && $sentTo[0] == 'everyone')
+            (!empty($sentTo) && isset($sentTo[0]) && 'everyone' == $sentTo[0])
         ) {
             // The message is sent to EVERYONE, so we set the group to 0
             /*api_item_property_update(
@@ -818,7 +817,7 @@ class AnnouncementManager
                 $sentToAllGroup = true;
             }
 
-            if ($sentToAllGroup === false) {
+            if (false === $sentToAllGroup) {
                 if (!empty($send_to_users['groups'])) {
                     foreach ($send_to_users['groups'] as $group) {
                         $groupInfo = GroupManager::get_group_properties($group);
@@ -968,7 +967,7 @@ class AnnouncementManager
             }
 
             // Send to everyone
-            if (isset($to[0]) && $to[0] === 'everyone') {
+            if (isset($to[0]) && 'everyone' === $to[0]) {
                 /*api_item_property_update(
                     $courseInfo,
                     TOOL_ANNOUNCEMENT,
@@ -1112,7 +1111,7 @@ class AnnouncementManager
     public static function get_course_groups()
     {
         $session_id = api_get_session_id();
-        if ($session_id != 0) {
+        if (0 != $session_id) {
             $new_group_list = CourseManager::get_group_list_of_course(
                 api_get_course_id(),
                 $session_id,
@@ -1248,7 +1247,7 @@ class AnnouncementManager
             if (isset($sent_to_array['groups']) &&
                 is_array($sent_to_array['groups']) &&
                 isset($sent_to_array['groups'][0]) &&
-                $sent_to_array['groups'][0] !== 0
+                0 !== $sent_to_array['groups'][0]
             ) {
                 $group_id = $sent_to_array['groups'][0];
 
@@ -1305,14 +1304,14 @@ class AnnouncementManager
 
         while ($row = Database::fetch_array($result)) {
             // if to_user_id <> 0 then it is sent to a specific user
-            if ($row['to_user_id'] != 0) {
+            if (0 != $row['to_user_id']) {
                 $sent_to_user[] = $row['to_user_id'];
                 continue;
             }
 
             // if to_group_id is null then it is sent to a specific user
             // if to_group_id = 0 then it is sent to everybody
-            if ($row['to_group_id'] != 0) {
+            if (0 != $row['to_group_id']) {
                 $sent_to_group[] = $row['to_group_id'];
             }
         }
@@ -1349,7 +1348,7 @@ class AnnouncementManager
                 FROM '.$table.'
 				WHERE c_id = '.$courseId.' AND announcement_id = '.$announcementId;
         $result = Database::query($sql);
-        if (Database::num_rows($result) != 0) {
+        if (0 != Database::num_rows($result)) {
             $row = Database::fetch_array($result, 'ASSOC');
         }
 
@@ -1376,7 +1375,7 @@ class AnnouncementManager
         $announcement_id = (int) $announcement_id;
         $courseId = api_get_course_int_id();
 
-        if (is_array($file) && $file['error'] == 0) {
+        if (is_array($file) && 0 == $file['error']) {
             // TODO: This path is obsolete. The new document repository scheme should be kept in mind here.
             $courseDir = $courseInfo['path'].'/upload/announcements';
             $sys_course_path = api_get_path(SYS_COURSE_PATH);
@@ -1439,7 +1438,7 @@ class AnnouncementManager
         $return = 0;
         $courseId = api_get_course_int_id();
 
-        if (is_array($file) && $file['error'] == 0) {
+        if (is_array($file) && 0 == $file['error']) {
             // TODO: This path is obsolete. The new document repository scheme should be kept in mind here.
             $courseDir = $courseInfo['path'].'/upload/announcements';
             $sys_course_path = api_get_path(SYS_COURSE_PATH);
@@ -1474,7 +1473,7 @@ class AnnouncementManager
                             size ='".intval($file['size'])."'
 					 	WHERE c_id = $courseId AND id = '$id_attach'";
                 $result = Database::query($sql);
-                if ($result === false) {
+                if (false === $result) {
                     $return = -1;
                     echo Display::return_message(
                         get_lang('The uploaded file could not be saved (perhaps a permission problem?)'),
@@ -1518,8 +1517,8 @@ class AnnouncementManager
      * @param bool          $sendToUsersInSession
      * @param bool          $sendToDrhUsers
      * @param Monolog\Handler\HandlerInterface logger
-     * @param int           $senderId
-     * @param bool          $directMessage
+     * @param int  $senderId
+     * @param bool $directMessage
      *
      * @return array
      */
@@ -1801,20 +1800,20 @@ class AnnouncementManager
                     }
 
                     $sql = "SELECT $select
-						FROM $tbl_announcement announcement
-						INNER JOIN $tbl_item_property ip
-						ON (announcement.id = ip.ref AND announcement.c_id = ip.c_id)
-						WHERE
-    						announcement.c_id = $courseId AND
-							ip.c_id = $courseId AND
-    						ip.tool='announcement'
-    						$cond_user_id
-    						$condition_session
-    						$searchCondition
-    						AND ip.visibility='1'
-    						AND announcement.session_id IN(0, ".$session_id.")
+                        FROM $tbl_announcement announcement
+                        INNER JOIN $tbl_item_property ip
+                        ON (announcement.id = ip.ref AND announcement.c_id = ip.c_id)
+                        WHERE
+                            announcement.c_id = $courseId AND
+                            ip.c_id = $courseId AND
+                            ip.tool='announcement'
+                            $cond_user_id
+                            $condition_session
+                            $searchCondition
+                            AND ip.visibility='1'
+                            AND announcement.session_id IN(0, ".$session_id.")
                         $groupBy
-						ORDER BY display_order DESC";
+                        ORDER BY display_order DESC";
                 } else {
                     if (($allowUserEditSetting && !api_is_anonymous())) {
                         $cond_user_id = " AND (
@@ -1908,7 +1907,7 @@ class AnnouncementManager
             if (!in_array($announcementId, $displayed)) {
                 $sent_to_icon = '';
                 // the email icon
-                if ($announcement->getEmailSent() == '1') {
+                if ('1' == $announcement->getEmailSent()) {
                     $sent_to_icon = ' '.$emailIcon;
                 }
 
@@ -1976,7 +1975,7 @@ class AnnouncementManager
                     (api_get_course_setting('allow_user_edit_announcement') && !api_is_anonymous()) ||
                     ($row['to_group_id'] == $group_id && $isTutor)
                 ) {
-                    if ($disableEdit === true) {
+                    if (true === $disableEdit) {
                         $modify_icons = "<a href='#'>".$editIconDisable."</a>";
                     } else {
                         $modify_icons = "<a href=\"".$actionUrl."&action=modify&id=".$announcementId."\">".$editIcon."</a>";
@@ -1994,7 +1993,7 @@ class AnnouncementManager
                         Display::return_icon($image_visibility.'.png', $alt_visibility, '', ICON_SIZE_SMALL)."</a>";
 
                     // DISPLAY MOVE UP COMMAND only if it is not the top announcement
-                    if ($iterator != 1) {
+                    if (1 != $iterator) {
                         $modify_icons .= "<a href=\"".$actionUrl."&action=move&up=".$announcementId."&sec_token=".$stok."\">".
                             Display::return_icon('up.gif', get_lang('Up'))."</a>";
                     } else {
@@ -2007,7 +2006,7 @@ class AnnouncementManager
                         $modify_icons .= Display::return_icon('down_na.gif', get_lang('down'));
                     }
                     if (api_is_allowed_to_edit(false, true)) {
-                        if ($disableEdit === true) {
+                        if (true === $disableEdit) {
                             $modify_icons .= Display::url($deleteIconDisable, '#');
                         } else {
                             $modify_icons .= "<a href=\"".$actionUrl."&action=delete&id=".$announcementId."&sec_token=".$stok."\" onclick=\"javascript:if(!confirm('".addslashes(
@@ -2078,8 +2077,8 @@ class AnnouncementManager
 
         if (api_is_allowed_to_edit(false, true)) {
             // check teacher status
-            if (empty($_GET['origin']) || $_GET['origin'] !== 'learnpath') {
-                if (api_get_group_id() == 0) {
+            if (empty($_GET['origin']) || 'learnpath' !== $_GET['origin']) {
+                if (0 == api_get_group_id()) {
                     $group_condition = '';
                 } else {
                     $group_condition = " AND (ip.to_group_id='".api_get_group_id()."' OR ip.to_group_id = 0 OR ip.to_group_id IS NULL)";
@@ -2109,11 +2108,10 @@ class AnnouncementManager
                 $count = $qb->getQuery()->getSingleScalarResult();
 
                 return $count;
-
             }
         } else {
             // students only get to see the visible announcements
-            if (empty($_GET['origin']) || $_GET['origin'] !== 'learnpath') {
+            if (empty($_GET['origin']) || 'learnpath' !== $_GET['origin']) {
                 $group_memberships = GroupManager::get_group_ids(
                     $courseInfo['real_id'],
                     $userId
@@ -2122,7 +2120,7 @@ class AnnouncementManager
                 if ((api_get_course_setting('allow_user_edit_announcement') &&
                     !api_is_anonymous())
                 ) {
-                    if (api_get_group_id() == 0) {
+                    if (0 == api_get_group_id()) {
                         $cond_user_id = " AND (
                         ip.lastedit_user_id = '".$userId."' OR (
                             ip.to_user_id='".$userId."' OR
@@ -2139,7 +2137,7 @@ class AnnouncementManager
                         )";
                     }
                 } else {
-                    if (api_get_group_id() == 0) {
+                    if (0 == api_get_group_id()) {
                         $cond_user_id = " AND (
                             ip.to_user_id='".$userId."' OR
                             ip.to_group_id IN (0, ".implode(", ", $group_memberships).") OR
diff --git a/public/main/inc/lib/Compilatio.php b/public/main/inc/lib/Compilatio.php
index 278b3f3270..2590f8fff9 100644
--- a/public/main/inc/lib/Compilatio.php
+++ b/public/main/inc/lib/Compilatio.php
@@ -482,7 +482,7 @@ class Compilatio
      */
     public static function plagiarismDeleteDoc($courseId, $itemId)
     {
-        if (api_get_configuration_value('allow_compilatio_tool') === false) {
+        if (false === api_get_configuration_value('allow_compilatio_tool')) {
             return false;
         }
 
diff --git a/public/main/inc/lib/CourseChatUtils.php b/public/main/inc/lib/CourseChatUtils.php
index 53b5a54019..ea430b6453 100644
--- a/public/main/inc/lib/CourseChatUtils.php
+++ b/public/main/inc/lib/CourseChatUtils.php
@@ -236,7 +236,7 @@ class CourseChatUtils
         /** @var CChatConnected $connection */
         foreach ($connectedUsers as $connection) {
             $date_count_time_seconds = $connection->getLastConnection()->getTimestamp();
-            if (strcmp($now->format('Y-m-d'), $connection->getLastConnection()->format('Y-m-d')) !== 0) {
+            if (0 !== strcmp($now->format('Y-m-d'), $connection->getLastConnection()->format('Y-m-d'))) {
                 continue;
             }
 
@@ -570,7 +570,7 @@ class CourseChatUtils
 
         array_splice($content, 0, $remove);
 
-        if (isset($_GET['origin']) && $_GET['origin'] == 'whoisonline') {
+        if (isset($_GET['origin']) && 'whoisonline' == $_GET['origin']) {
             //the caller
             $content[0] = get_lang('Chat call has been sent. Waiting for the approval of your partner.').'<br />'.$content[0];
         }
diff --git a/public/main/inc/lib/CoursesAndSessionsCatalog.class.php b/public/main/inc/lib/CoursesAndSessionsCatalog.class.php
index 79b377b3c1..e64bc979e6 100644
--- a/public/main/inc/lib/CoursesAndSessionsCatalog.class.php
+++ b/public/main/inc/lib/CoursesAndSessionsCatalog.class.php
@@ -42,7 +42,7 @@ class CoursesAndSessionsCatalog
     {
         $catalogShow = (int) api_get_setting('catalog_show_courses_sessions');
 
-        if ($catalogShow == CATALOG_SESSIONS || $catalogShow == CATALOG_COURSES_SESSIONS) {
+        if (CATALOG_SESSIONS == $catalogShow || CATALOG_COURSES_SESSIONS == $catalogShow) {
             return true;
         }
 
@@ -60,7 +60,7 @@ class CoursesAndSessionsCatalog
     {
         $catalogShow = (int) api_get_setting('catalog_show_courses_sessions');
 
-        if ($catalogShow == CATALOG_COURSES || $catalogShow == CATALOG_COURSES_SESSIONS) {
+        if (CATALOG_COURSES == $catalogShow || CATALOG_COURSES_SESSIONS == $catalogShow) {
             return true;
         }
 
@@ -350,7 +350,7 @@ class CoursesAndSessionsCatalog
                     $id_in = "$id";
                 }
             }
-            if ($id_in === null) {
+            if (null === $id_in) {
                 return [];
             }
             $sql = "SELECT *, id as real_id FROM $tbl_course WHERE id IN($id_in)";
@@ -362,7 +362,7 @@ class CoursesAndSessionsCatalog
             $joinCategory = '';
 
             if (empty($listCode)) {
-                if ($category_code === 'NONE') {
+                if ('NONE' === $category_code) {
                     $conditionCode .= " category_id IS NULL";
                 } else {
                     $conditionCode .= " course_category.code = '$category_code' ";
@@ -376,7 +376,7 @@ class CoursesAndSessionsCatalog
                 $conditionCode .= " course_category.code = '$category_code' ";
             }
 
-            if (empty($category_code) || $category_code == 'ALL') {
+            if (empty($category_code) || 'ALL' == $category_code) {
                 $sql = "SELECT *, id as real_id
                         FROM $tbl_course course
                         WHERE
@@ -400,7 +400,7 @@ class CoursesAndSessionsCatalog
                 $tbl_url_rel_course = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
 
                 $urlCondition = ' access_url_id = '.$urlId.' ';
-                if ($category_code != 'ALL') {
+                if ('ALL' != $category_code) {
                     $sql = "SELECT *, course.id real_id, course_category.code AS category_code FROM $tbl_course as course
                             $joinCategory
                             INNER JOIN $tbl_url_rel_course as url_rel_course
@@ -435,7 +435,7 @@ class CoursesAndSessionsCatalog
                 api_get_utc_datetime(time() - (30 * 86400))
             );
 
-            if ($row['tutor_name'] == '0') {
+            if ('0' == $row['tutor_name']) {
                 $row['tutor_name'] = get_lang('No administrator');
             }
             $point_info = CourseManager::get_course_ranking($row['id'], 0);
@@ -498,7 +498,7 @@ class CoursesAndSessionsCatalog
 
         if (api_is_multiple_url_enabled()) {
             $urlId = api_get_current_access_url_id();
-            if ($urlId != -1) {
+            if (-1 != $urlId) {
                 $tbl_url_rel_course = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
 
                 $urlCondition = ' access_url_id = '.$urlId.' AND';
@@ -702,7 +702,7 @@ class CoursesAndSessionsCatalog
 
         $sessionsToBrowse = [];
         foreach ($sessions as $session) {
-            if ($session->getNbrCourses() === 0) {
+            if (0 === $session->getNbrCourses()) {
                 continue;
             }
             $sessionsToBrowse[] = $session;
@@ -712,7 +712,7 @@ class CoursesAndSessionsCatalog
     }
 
     /**
-     * Search sessions by the title
+     * Search sessions by the title.
      *
      * @param string $keyword
      * @param array  $limit   Limit info
@@ -754,7 +754,7 @@ class CoursesAndSessionsCatalog
 
         $sessionsToBrowse = [];
         foreach ($sessions as $session) {
-            if ($session->getNbrCourses() === 0) {
+            if (0 === $session->getNbrCourses()) {
                 continue;
             }
             $sessionsToBrowse[] = $session;
@@ -814,7 +814,7 @@ class CoursesAndSessionsCatalog
         $list = [];
         $row = [];
 
-        if ($code != 'ALL' and $code != 'NONE') {
+        if ('ALL' != $code and 'NONE' != $code) {
             foreach ($allCategories as $category) {
                 if ($category['code'] === $code) {
                     $list = self::buildCourseCategoryTree($allCategories, $category['code'], 0);
diff --git a/public/main/inc/lib/ExerciseCategoryManager.php b/public/main/inc/lib/ExerciseCategoryManager.php
index 231e992268..a7c57d5338 100644
--- a/public/main/inc/lib/ExerciseCategoryManager.php
+++ b/public/main/inc/lib/ExerciseCategoryManager.php
@@ -205,7 +205,7 @@ class ExerciseCategoryManager extends Model
         $header = get_lang('Add');
         $defaults = [];
 
-        if ($action === 'edit') {
+        if ('edit' === $action) {
             $header = get_lang('Edit');
             // Setting the defaults
             $defaults = $this->get($id, false);
@@ -220,7 +220,7 @@ class ExerciseCategoryManager extends Model
 
         $form->addHtmlEditor('description', get_lang('Description'));
 
-        if ($action === 'edit') {
+        if ('edit' === $action) {
             $form->addButtonUpdate(get_lang('Edit'));
         } else {
             $form->addButtonCreate(get_lang('Add'));
diff --git a/public/main/inc/lib/GamificationUtils.php b/public/main/inc/lib/GamificationUtils.php
index 7a92bee3a8..59a9ff471d 100644
--- a/public/main/inc/lib/GamificationUtils.php
+++ b/public/main/inc/lib/GamificationUtils.php
@@ -113,7 +113,7 @@ class GamificationUtils
                 true
             );
 
-            if ($courseProgress === false) {
+            if (false === $courseProgress) {
                 continue;
             }
 
diff --git a/public/main/inc/lib/MailTemplateManager.php b/public/main/inc/lib/MailTemplateManager.php
index 19a4656a23..7b44882ed2 100644
--- a/public/main/inc/lib/MailTemplateManager.php
+++ b/public/main/inc/lib/MailTemplateManager.php
@@ -86,7 +86,7 @@ class MailTemplateManager extends Model
         $form = new FormValidator('template', 'post', $url);
         // Setting the form elements
         $header = get_lang('Add');
-        if ($action === 'edit') {
+        if ('edit' === $action) {
             $header = get_lang('Edit');
         }
         $id = isset($_GET['id']) ? (int) $_GET['id'] : '';
@@ -140,7 +140,7 @@ class MailTemplateManager extends Model
 
         $defaults = $this->get($id);
 
-        if ($action === 'edit') {
+        if ('edit' === $action) {
             $form->addLabel(get_lang('Created at'), Display::dateToStringAgoAndLongDate($defaults['created_at']));
             $form->addLabel(get_lang('Updated at'), Display::dateToStringAgoAndLongDate($defaults['updated_at']));
             $form->addButtonSave(get_lang('Edit'), 'submit');
diff --git a/public/main/inc/lib/MoodleImport.php b/public/main/inc/lib/MoodleImport.php
index c634512745..6bdb8e2bde 100644
--- a/public/main/inc/lib/MoodleImport.php
+++ b/public/main/inc/lib/MoodleImport.php
@@ -6,8 +6,6 @@
  *
  * @author  José Loguercio <jose.loguercio@beeznest.com>,
  * @author  Julio Montoya <gugli100@gmail.com>
- *
- * @package chamilo.library
  */
 class MoodleImport
 {
@@ -69,7 +67,7 @@ class MoodleImport
 
                 if (!empty($packageContent)) {
                     foreach ($packageContent as $index => $value) {
-                        if ($value['filename'] == 'moodle_backup.xml') {
+                        if ('moodle_backup.xml' == $value['filename']) {
                             $mainFileKey = $index;
                             break;
                         }
@@ -220,7 +218,7 @@ class MoodleImport
 
                     // Match shuffle question with chamilo
                     if (isset($moduleValues['shufflequestions']) &&
-                        (int) $moduleValues['shufflequestions'] === 1
+                        1 === (int) $moduleValues['shufflequestions']
                     ) {
                         $exercise->setRandom(-1);
                     } else {
@@ -230,7 +228,7 @@ class MoodleImport
                     // @todo divide to minutes
                     $exercise->updateExpiredTime((int) $moduleValues['timelimit']);
 
-                    if ($moduleValues['questionsperpage'] == 1) {
+                    if (1 == $moduleValues['questionsperpage']) {
                         $exercise->updateType(2);
                     } else {
                         $exercise->updateType(1);
@@ -280,7 +278,7 @@ class MoodleImport
                         $questionInstance->updateCategory(0);
 
                         //Save normal question if NOT media
-                        if ($questionInstance->type != MEDIA_QUESTION) {
+                        if (MEDIA_QUESTION != $questionInstance->type) {
                             $questionInstance->save($exercise);
 
                             // modify the exercise
@@ -516,10 +514,10 @@ class MoodleImport
             }
             $isThisItemThatIWant = false;
             foreach ($activity->childNodes as $item) {
-                if (!$isThisItemThatIWant && $item->nodeName == 'contenthash') {
+                if (!$isThisItemThatIWant && 'contenthash' == $item->nodeName) {
                     $currentItem['contenthash'] = $item->nodeValue;
                 }
-                if ($item->nodeName == 'contextid' &&
+                if ('contextid' == $item->nodeName &&
                     (int) $item->nodeValue == (int) $contextId &&
                     !$isThisItemThatIWant
                 ) {
@@ -527,22 +525,22 @@ class MoodleImport
                     continue;
                 }
 
-                if ($isThisItemThatIWant && $item->nodeName == 'filename') {
+                if ($isThisItemThatIWant && 'filename' == $item->nodeName) {
                     $currentItem['filename'] = $item->nodeValue;
                 }
 
-                if ($isThisItemThatIWant && $item->nodeName == 'filesize') {
+                if ($isThisItemThatIWant && 'filesize' == $item->nodeName) {
                     $currentItem['filesize'] = $item->nodeValue;
                 }
 
-                if ($isThisItemThatIWant && $item->nodeName == 'mimetype' &&
-                    $item->nodeValue == 'document/unknown'
+                if ($isThisItemThatIWant && 'mimetype' == $item->nodeName &&
+                    'document/unknown' == $item->nodeValue
                 ) {
                     break;
                 }
 
-                if ($isThisItemThatIWant && $item->nodeName == 'mimetype' &&
-                    $item->nodeValue !== 'document/unknown'
+                if ($isThisItemThatIWant && 'mimetype' == $item->nodeName &&
+                    'document/unknown' !== $item->nodeValue
                 ) {
                     $currentItem['mimetype'] = $item->nodeValue;
                     break 2;
@@ -584,7 +582,7 @@ class MoodleImport
             $questionType = '';
             foreach ($question->childNodes as $item) {
                 $currentItem[$item->nodeName] = $item->nodeValue;
-                if ($item->nodeName == 'qtype') {
+                if ('qtype' == $item->nodeName) {
                     $questionType = $item->nodeValue;
                 }
 
@@ -608,7 +606,7 @@ class MoodleImport
                     foreach ($typeValues->item($i)->childNodes as $properties) {
                         $currentItem[$questionType.'_values'][$properties->nodeName] = $properties->nodeValue;
 
-                        if ($properties->nodeName != 'sequence') {
+                        if ('sequence' != $properties->nodeName) {
                             continue;
                         }
 
@@ -1077,27 +1075,27 @@ class MoodleImport
 
             if ($activity->childNodes->length) {
                 foreach ($activity->childNodes as $item) {
-                    if ($item->nodeName == 'component' && $item->nodeValue == 'mod_resource') {
+                    if ('component' == $item->nodeName && 'mod_resource' == $item->nodeValue) {
                         $thisIsAnInvalidItem = true;
                     }
 
-                    if ($item->nodeName == 'contenthash') {
+                    if ('contenthash' == $item->nodeName) {
                         $currentItem['contenthash'] = $item->nodeValue;
                     }
 
-                    if ($item->nodeName == 'filename') {
+                    if ('filename' == $item->nodeName) {
                         $currentItem['filename'] = $item->nodeValue;
                     }
 
-                    if ($item->nodeName == 'filesize') {
+                    if ('filesize' == $item->nodeName) {
                         $currentItem['filesize'] = $item->nodeValue;
                     }
 
-                    if ($item->nodeName == 'mimetype' && $item->nodeValue == 'document/unknown') {
+                    if ('mimetype' == $item->nodeName && 'document/unknown' == $item->nodeValue) {
                         $thisIsAnInvalidItem = true;
                     }
 
-                    if ($item->nodeName == 'mimetype' && $item->nodeValue !== 'document/unknown') {
+                    if ('mimetype' == $item->nodeName && 'document/unknown' !== $item->nodeValue) {
                         $currentItem['mimetype'] = $item->nodeValue;
                     }
                 }
diff --git a/public/main/inc/lib/NotificationEvent.php b/public/main/inc/lib/NotificationEvent.php
index d85b2cac04..30efb8c90a 100644
--- a/public/main/inc/lib/NotificationEvent.php
+++ b/public/main/inc/lib/NotificationEvent.php
@@ -3,6 +3,8 @@
 
 class NotificationEvent extends Model
 {
+    const ACCOUNT_EXPIRATION = 1;
+    const JUSTIFICATION_EXPIRATION = 2;
     public $table;
     public $columns = [
         'id',
@@ -14,9 +16,6 @@ class NotificationEvent extends Model
         'event_type',
         'event_id',
     ];
-
-    const ACCOUNT_EXPIRATION = 1;
-    const JUSTIFICATION_EXPIRATION = 2;
     public $extraFieldName;
 
     /**
@@ -63,7 +62,6 @@ class NotificationEvent extends Model
         }
         $form->freeze('event_id');
 
-
         $form->addText('title', get_lang('Title'));
         $form->addTextarea('content', get_lang('Content'));
         $form->addText('link', get_lang('Link'), false);
@@ -121,7 +119,7 @@ class NotificationEvent extends Model
         $userInfo = api_get_user_info($userId);
         $events = $this->get_all();
         $extraFieldData = $this->getUserExtraData(api_get_user_id());
-        $allowJustification = api_get_plugin_setting('justification', 'tool_enable') === 'true';
+        $allowJustification = 'true' === api_get_plugin_setting('justification', 'tool_enable');
 
         $userJustificationList = [];
         if ($allowJustification) {
@@ -132,7 +130,7 @@ class NotificationEvent extends Model
         $notifications = [];
         foreach ($events as $event) {
             $days = (int) $event['day_diff'];
-            $checkIsRead = $event['persistent'] == 0 ? true : false;
+            $checkIsRead = 0 == $event['persistent'] ? true : false;
             $eventItemId = $event['event_id'];
 
             switch ($event['event_type']) {
@@ -149,14 +147,14 @@ class NotificationEvent extends Model
                     }
 
                     $showNotification = $this->showNotification($userInfo['expiration_date'], $days);
-                    if ($showNotification && $read === false) {
+                    if ($showNotification && false === $read) {
                         $notifications[] = [
                             'id' => $id,
                             'title' => $event['title'],
                             'content' => $event['content'],
                             'event_text' => get_lang('ExpirationDate').': '.api_get_local_time($userInfo['expiration_date']),
                             'link' => $event['link'],
-                            'persistent' => $event['persistent']
+                            'persistent' => $event['persistent'],
                         ];
                     }
                     break;
@@ -190,14 +188,14 @@ class NotificationEvent extends Model
                                 $url = api_get_path(WEB_CODE_PATH).'auth/justification.php#'.$fieldData['code'];
                             }
 
-                            if ($showNotification && $read === false) {
+                            if ($showNotification && false === $read) {
                                 $notifications[] = [
                                     'id' => $id,
                                     'title' => $event['title'],
                                     'content' => $event['content'],
                                     'event_text' => $eventText,
                                     'link' => $url,
-                                    'persistent' => $event['persistent']
+                                    'persistent' => $event['persistent'],
                                 ];
                             }
                         }
diff --git a/public/main/inc/lib/ScheduledAnnouncement.php b/public/main/inc/lib/ScheduledAnnouncement.php
index 1e5561426d..764ef4c00c 100644
--- a/public/main/inc/lib/ScheduledAnnouncement.php
+++ b/public/main/inc/lib/ScheduledAnnouncement.php
@@ -15,8 +15,6 @@
  *
  * Requires:
  * composer update
- *
- * @package chamilo.library
  */
 class ScheduledAnnouncement extends Model
 {
@@ -125,7 +123,7 @@ class ScheduledAnnouncement extends Model
 
         $form->addCheckBox('sent', null, get_lang('Message Sent'));
 
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $form->addButtonUpdate(get_lang('Edit'));
         }
 
@@ -148,7 +146,7 @@ class ScheduledAnnouncement extends Model
         // Setting the form elements
         $header = get_lang('Add');
 
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $header = get_lang('Edit');
         }
 
@@ -159,7 +157,7 @@ class ScheduledAnnouncement extends Model
         );
 
         $form->addHeader($header);
-        if ($action == 'add') {
+        if ('add' == $action) {
             $form->addHtml(
                 Display::return_message(
                     nl2br(get_lang('This form allows scheduling announcements to be sent automatically to the students who are taking a course in a session.')),
@@ -247,7 +245,7 @@ class ScheduledAnnouncement extends Model
 
         $this->setTagsInForm($form);
 
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $form->addButtonUpdate(get_lang('Edit'));
         } else {
             $form->addButtonCreate(get_lang('Add'));
@@ -327,7 +325,7 @@ class ScheduledAnnouncement extends Model
                         $sendToCoaches = $extraFieldValue->get_values_by_handler_and_field_variable($result['id'], 'send_to_coaches');
                         $courseList = SessionManager::getCoursesInSession($sessionId);
                         $coachList = [];
-                        if (!empty($sendToCoaches) && !empty($sendToCoaches['value']) && $sendToCoaches['value'] == 1) {
+                        if (!empty($sendToCoaches) && !empty($sendToCoaches['value']) && 1 == $sendToCoaches['value']) {
                             foreach ($courseList as $courseItemId) {
                                 $coaches = SessionManager::getCoachesByCourseSession(
                                     $sessionId,
diff --git a/public/main/inc/lib/SortableTableFromArray.php b/public/main/inc/lib/SortableTableFromArray.php
index a666417586..2af2490d78 100644
--- a/public/main/inc/lib/SortableTableFromArray.php
+++ b/public/main/inc/lib/SortableTableFromArray.php
@@ -3,8 +3,6 @@
 
 /**
  * Sortable table which can be used for data available in an array.
- *
- * @package chamilo.library
  */
 class SortableTableFromArray extends SortableTable
 {
@@ -59,7 +57,7 @@ class SortableTableFromArray extends SortableTable
             $content = TableSort::sort_table(
                 $this->table_data,
                 $this->column,
-                $this->direction === 'ASC' ? SORT_ASC : SORT_DESC
+                'ASC' === $this->direction ? SORT_ASC : SORT_DESC
             );
         } else {
             $content = $this->table_data;
diff --git a/public/main/inc/lib/SortableTableFromArrayConfig.php b/public/main/inc/lib/SortableTableFromArrayConfig.php
index bba9bf7b54..cd2ee2f061 100644
--- a/public/main/inc/lib/SortableTableFromArrayConfig.php
+++ b/public/main/inc/lib/SortableTableFromArrayConfig.php
@@ -9,8 +9,6 @@
  * $column_order is an array that lets us decide the ordering of the columns
  * i.e: $column_header=array('a','b','c','d','e'); $column_order=array(1,2,5,4,5);
  * These means that the 3th column (letter "c") will be sort like the order we use in the 5th column
- *
- * @package chamilo.library
  */
 class SortableTableFromArrayConfig extends SortableTable
 {
@@ -81,7 +79,7 @@ class SortableTableFromArrayConfig extends SortableTable
         $table = TableSort::sort_table_config(
             $this->table_data,
             $this->column,
-            $this->direction === 'ASC' ? SORT_ASC : SORT_DESC,
+            'ASC' === $this->direction ? SORT_ASC : SORT_DESC,
             $this->column_show,
             $this->column_order,
             SORT_REGULAR,
diff --git a/public/main/inc/lib/SurveyTree .php b/public/main/inc/lib/SurveyTree .php
index a7b6f206ca..34d16f3cff 100644
--- a/public/main/inc/lib/SurveyTree .php	
+++ b/public/main/inc/lib/SurveyTree .php	
@@ -3,8 +3,6 @@
 
 /**
  * Manage the "versioning" of a conditional survey.
- *
- *	@package chamilo.survey
  */
 class SurveyTree
 {
@@ -57,7 +55,7 @@ class SurveyTree
             $thisref['name'] = $survey['name'];
             $thisref['id'] = $survey['survey_id'];
             $thisref['survey_version'] = $survey['survey_version'];
-            if ($survey['parent_id'] == 0) {
+            if (0 == $survey['parent_id']) {
                 $list[$survey['survey_id']] = &$thisref;
             } else {
                 $refs[$survey['parent_id']]['children'][$survey['survey_id']] = &$thisref;
diff --git a/public/main/inc/lib/TeacherTimeReport.php b/public/main/inc/lib/TeacherTimeReport.php
index e7bb559ab9..2726e53dfa 100644
--- a/public/main/inc/lib/TeacherTimeReport.php
+++ b/public/main/inc/lib/TeacherTimeReport.php
@@ -5,8 +5,6 @@
  * Library for generate a teacher time report.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.admin
  */
 class TeacherTimeReport
 {
diff --git a/public/main/inc/lib/TicketManager.php b/public/main/inc/lib/TicketManager.php
index dc87a7b3ef..6154c5de2b 100644
--- a/public/main/inc/lib/TicketManager.php
+++ b/public/main/inc/lib/TicketManager.php
@@ -9,8 +9,6 @@ use Chamilo\TicketBundle\Entity\Ticket;
 
 /**
  * Class TicketManager.
- *
- * @package chamilo.plugin.ticket
  */
 class TicketManager
 {
@@ -197,7 +195,7 @@ class TicketManager
 
         $table = Database::get_main_table(TABLE_TICKET_CATEGORY_REL_USER);
         foreach ($users as $userId) {
-            if (self::userIsAssignedToCategory($userId, $categoryId) === false) {
+            if (false === self::userIsAssignedToCategory($userId, $categoryId)) {
                 $params = [
                     'category_id' => $categoryId,
                     'user_id' => $userId,
@@ -320,7 +318,7 @@ class TicketManager
         $project_id = (int) $project_id;
         $priority = empty($priority) ? self::PRIORITY_NORMAL : (int) $priority;
 
-        if ($status === '') {
+        if ('' === $status) {
             $status = self::STATUS_NEW;
             if ($other_area > 0) {
                 $status = self::STATUS_FORWARDED;
@@ -389,7 +387,7 @@ class TicketManager
                 false
             ));
 
-            if ($assignedUserId != 0) {
+            if (0 != $assignedUserId) {
                 self::assignTicketToUser(
                     $ticketId,
                     $assignedUserId
@@ -468,7 +466,7 @@ class TicketManager
                         </tr>
                     </table>';
 
-            if ($assignedUserId != 0) {
+            if (0 != $assignedUserId) {
                 $href = api_get_path(WEB_CODE_PATH).'/ticket/ticket_details.php?ticket_id='.$ticketId;
                 $helpDeskMessage .= sprintf(
                     get_lang('TicketAssignedToXCheckZAtLinkY'),
@@ -479,7 +477,7 @@ class TicketManager
             }
 
             if (empty($category_id)) {
-                if (api_get_setting('ticket_send_warning_to_all_admins') === 'true') {
+                if ('true' === api_get_setting('ticket_send_warning_to_all_admins')) {
                     $warningSubject = sprintf(
                         get_lang('Ticket %s createdWithNoCategory'),
                         $ticket_code
@@ -503,7 +501,7 @@ class TicketManager
 
                 $message = '<h2>'.get_lang('Ticket info').'</h2><br />'.$helpDeskMessage;
 
-                if (api_get_setting('ticket_warn_admin_no_user_in_category') === 'true') {
+                if ('true' === api_get_setting('ticket_warn_admin_no_user_in_category')) {
                     $usersInCategory = self::getUsersInCategory($category_id);
                     if (empty($usersInCategory)) {
                         $subject = sprintf(
@@ -511,7 +509,7 @@ class TicketManager
                             $categoryInfo['name']
                         );
 
-                        if (api_get_setting('ticket_send_warning_to_all_admins') === 'true') {
+                        if ('true' === api_get_setting('ticket_send_warning_to_all_admins')) {
                             Display::addFlash(Display::return_message(
                                 sprintf(
                                     get_lang('A notification was sent to the administrators to report this category has no user assigned'),
@@ -685,14 +683,14 @@ class TicketManager
 
             if (is_array($fileAttachments)) {
                 foreach ($fileAttachments as $file_attach) {
-                    if ($file_attach['error'] == 0) {
+                    if (0 == $file_attach['error']) {
                         self::saveMessageAttachmentFile(
                             $file_attach,
                             $ticketId,
                             $messageId
                         );
                     } else {
-                        if ($file_attach['error'] != UPLOAD_ERR_NO_FILE) {
+                        if (UPLOAD_ERR_NO_FILE != $file_attach['error']) {
                             return false;
                         }
                     }
@@ -855,12 +853,12 @@ class TicketManager
         $userIsAllowInProject = self::userIsAllowInProject($userInfo, $projectId);
 
         // Check if a role was set to the project
-        if ($userIsAllowInProject == false) {
+        if (false == $userIsAllowInProject) {
             $sql .= " AND (ticket.assigned_last_user = $userId OR ticket.sys_insert_user_id = $userId )";
         }
 
         // Search simple
-        if (isset($_GET['submit_simple']) && $_GET['keyword'] != '') {
+        if (isset($_GET['submit_simple']) && '' != $_GET['keyword']) {
             $keyword = Database::escape_string(trim($_GET['keyword']));
             $sql .= " AND (
                       ticket.id LIKE '%$keyword%' OR
@@ -900,15 +898,15 @@ class TicketManager
         $keyword_course = isset($_GET['keyword_course']) ? Database::escape_string(trim($_GET['keyword_course'])) : '';
         $keyword_range = !empty($keyword_start_date_start) && !empty($keyword_start_date_end);
 
-        if ($keyword_range == false && $keyword_start_date_start != '') {
+        if (false == $keyword_range && '' != $keyword_start_date_start) {
             $sql .= " AND DATE_FORMAT(ticket.start_date,'%d/%m/%Y') >= '$keyword_start_date_start' ";
         }
-        if ($keyword_range && $keyword_start_date_start != '' && $keyword_start_date_end != '') {
+        if ($keyword_range && '' != $keyword_start_date_start && '' != $keyword_start_date_end) {
             $sql .= " AND DATE_FORMAT(ticket.start_date,'%d/%m/%Y') >= '$keyword_start_date_start'
                       AND DATE_FORMAT(ticket.start_date,'%d/%m/%Y') <= '$keyword_start_date_end'";
         }
 
-        if ($keyword_course != '') {
+        if ('' != $keyword_course) {
             $course_table = Database::get_main_table(TABLE_MAIN_COURSE);
             $sql .= " AND ticket.course_id IN ( 
                      SELECT id FROM $course_table
@@ -929,7 +927,7 @@ class TicketManager
             $userInfo = api_get_user_info($row['sys_insert_user_id']);
             $hrefUser = $webPath.'main/admin/user_information.php?user_id='.$userInfo['user_id'];
             $name = "<a href='$hrefUser'> {$userInfo['complete_name_with_username']} </a>";
-            if ($row['assigned_last_user'] != 0) {
+            if (0 != $row['assigned_last_user']) {
                 $assignedUserInfo = api_get_user_info($row['assigned_last_user']);
                 if (!empty($assignedUserInfo)) {
                     $hrefResp = $webPath.'main/admin/user_information.php?user_id='.$assignedUserInfo['user_id'];
@@ -938,7 +936,7 @@ class TicketManager
                     $row['assigned_last_user'] = get_lang('Unknown user');
                 }
             } else {
-                if ($row['status_id'] !== self::STATUS_FORWARDED) {
+                if (self::STATUS_FORWARDED !== $row['status_id']) {
                     $row['assigned_last_user'] = '<span style="color:#ff0000;">'.get_lang('To be assigned').'</span>';
                 } else {
                     $row['assigned_last_user'] = '<span style="color:#00ff00;">'.get_lang('Message resent').'</span>';
@@ -1049,7 +1047,7 @@ class TicketManager
 
         // Search simple
         if (isset($_GET['submit_simple'])) {
-            if ($_GET['keyword'] != '') {
+            if ('' != $_GET['keyword']) {
                 $keyword = Database::escape_string(trim($_GET['keyword']));
                 $sql .= " AND (
                           ticket.code LIKE '%$keyword%' OR
@@ -1084,14 +1082,14 @@ class TicketManager
         $keyword_range = isset($_GET['keyword_dates']) ? Database::escape_string(trim($_GET['keyword_dates'])) : '';
         $keyword_course = isset($_GET['keyword_course']) ? Database::escape_string(trim($_GET['keyword_course'])) : '';
 
-        if ($keyword_range == false && $keyword_start_date_start != '') {
+        if (false == $keyword_range && '' != $keyword_start_date_start) {
             $sql .= " AND DATE_FORMAT( ticket.start_date,'%d/%m/%Y') = '$keyword_start_date_start' ";
         }
-        if ($keyword_range && $keyword_start_date_start != '' && $keyword_start_date_end != '') {
+        if ($keyword_range && '' != $keyword_start_date_start && '' != $keyword_start_date_end) {
             $sql .= " AND DATE_FORMAT( ticket.start_date,'%d/%m/%Y') >= '$keyword_start_date_start'
                       AND DATE_FORMAT( ticket.start_date,'%d/%m/%Y') <= '$keyword_start_date_end'";
         }
-        if ($keyword_course != '') {
+        if ('' != $keyword_course) {
             $course_table = Database::get_main_table(TABLE_MAIN_COURSE);
             $sql .= " AND ticket.course_id IN (  
                         SELECT id
@@ -1198,7 +1196,7 @@ class TicketManager
                     api_get_timezone()
                 );
                 $row['course_url'] = null;
-                if ($row['course_id'] != 0) {
+                if (0 != $row['course_id']) {
                     $course = api_get_course_info_by_id($row['course_id']);
                     $sessionId = 0;
                     if ($row['session_id']) {
@@ -1583,7 +1581,7 @@ class TicketManager
         $history = [];
         $webpath = api_get_path(WEB_PATH);
         while ($row = Database::fetch_assoc($result)) {
-            if ($row['user_id'] != 0) {
+            if (0 != $row['user_id']) {
                 $assignuser = api_get_user_info($row['user_id']);
                 $row['assignuser'] = '<a href="'.$webpath.'main/admin/user_information.php?user_id='.$row['user_id'].'"  target="_blank">'.
                 $assignuser['username'].'</a>';
@@ -1630,7 +1628,7 @@ class TicketManager
         if (is_null($direction)) {
             $direction = 'DESC';
         }
-        if (is_null($userId) || $userId == 0) {
+        if (is_null($userId) || 0 == $userId) {
             $userId = api_get_user_id();
         }
 
@@ -1655,7 +1653,7 @@ class TicketManager
                     AND user.user_id = ticket.request_user ";
         // Search simple
         if (isset($_GET['submit_simple'])) {
-            if ($_GET['keyword'] !== '') {
+            if ('' !== $_GET['keyword']) {
                 $keyword = Database::escape_string(trim($_GET['keyword']));
                 $sql .= " AND (ticket.code = '$keyword'
                           OR user.firstname LIKE '%$keyword%'
@@ -1699,10 +1697,10 @@ class TicketManager
                 trim($_GET['keyword_course'])
             );
 
-            if ($keyword_category != '') {
+            if ('' != $keyword_category) {
                 $sql .= " AND ticket.category_id = '$keyword_category'  ";
             }
-            if ($keyword_request_user != '') {
+            if ('' != $keyword_request_user) {
                 $sql .= " AND (ticket.request_user = '$keyword_request_user'
                           OR user.firstname LIKE '%$keyword_request_user%'
                           OR user.official_code LIKE '%$keyword_request_user%'
@@ -1714,26 +1712,26 @@ class TicketManager
             if (!empty($keywordAssignedTo)) {
                 $sql .= " AND ticket.assigned_last_user = $keywordAssignedTo ";
             }
-            if ($keyword_status != '') {
+            if ('' != $keyword_status) {
                 $sql .= " AND ticket.status_id = '$keyword_status'  ";
             }
-            if ($keyword_range == '' && $keyword_start_date_start != '') {
+            if ('' == $keyword_range && '' != $keyword_start_date_start) {
                 $sql .= " AND DATE_FORMAT( ticket.start_date,'%d/%m/%Y') = '$keyword_start_date_start' ";
             }
-            if ($keyword_range == '1' && $keyword_start_date_start != '' && $keyword_start_date_end != '') {
+            if ('1' == $keyword_range && '' != $keyword_start_date_start && '' != $keyword_start_date_end) {
                 $sql .= " AND DATE_FORMAT( ticket.start_date,'%d/%m/%Y') >= '$keyword_start_date_start'
                           AND DATE_FORMAT( ticket.start_date,'%d/%m/%Y') <= '$keyword_start_date_end'";
             }
-            if ($keyword_priority != '') {
+            if ('' != $keyword_priority) {
                 $sql .= " AND ticket.priority_id = '$keyword_priority'  ";
             }
-            if ($keyword_source != '') {
+            if ('' != $keyword_source) {
                 $sql .= " AND ticket.source = '$keyword_source' ";
             }
-            if ($keyword_priority != '') {
+            if ('' != $keyword_priority) {
                 $sql .= " AND ticket.priority_id = '$keyword_priority' ";
             }
-            if ($keyword_course != '') {
+            if ('' != $keyword_course) {
                 $course_table = Database::get_main_table(TABLE_MAIN_COURSE);
                 $sql .= " AND ticket.course_id IN ( ";
                 $sql .= "SELECT id
@@ -1742,7 +1740,7 @@ class TicketManager
                          OR code LIKE '%$keyword_course%'
                          OR visual_code LIKE '%$keyword_course%' )) ";
             }
-            if ($keyword_unread == 'yes') {
+            if ('yes' == $keyword_unread) {
                 $sql .= " AND ticket.id IN (
                           SELECT ticket.id
                           FROM $table_support_tickets ticket,
@@ -1754,7 +1752,7 @@ class TicketManager
                           AND user.status != 1   AND ticket.status_id != '".self::STATUS_FORWARDED."'
                           GROUP BY ticket.id)";
             } else {
-                if ($keyword_unread == 'no') {
+                if ('no' == $keyword_unread) {
                     $sql .= " AND ticket.id NOT IN (
                               SELECT ticket.id
                               FROM  $table_support_tickets ticket,
@@ -1786,7 +1784,7 @@ class TicketManager
         ];
 
         while ($row = Database::fetch_assoc($result)) {
-            if ($row['responsable'] != 0) {
+            if (0 != $row['responsable']) {
                 $row['responsable'] = api_get_user_info($row['responsable']);
                 $row['responsable'] = $row['responsable']['firstname'].' '.$row['responsable']['lastname'];
             }
diff --git a/public/main/inc/lib/VideoChat.php b/public/main/inc/lib/VideoChat.php
index e1db23eebc..09576f54ad 100644
--- a/public/main/inc/lib/VideoChat.php
+++ b/public/main/inc/lib/VideoChat.php
@@ -87,7 +87,7 @@ class VideoChat
             'first'
         );
 
-        if ($resultData !== false) {
+        if (false !== $resultData) {
             return $resultData['count'] > 0;
         }
 
diff --git a/public/main/inc/lib/access_url_edit_courses_to_url_functions.lib.php b/public/main/inc/lib/access_url_edit_courses_to_url_functions.lib.php
index 94da795535..58b97a0f7a 100644
--- a/public/main/inc/lib/access_url_edit_courses_to_url_functions.lib.php
+++ b/public/main/inc/lib/access_url_edit_courses_to_url_functions.lib.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Definition of the Accessurleditcoursestourl class.
- *
- * @package chamilo.library
  */
 
 /**
diff --git a/public/main/inc/lib/access_url_edit_sessions_to_url_functions.lib.php b/public/main/inc/lib/access_url_edit_sessions_to_url_functions.lib.php
index 83502b0086..6ea39a276a 100644
--- a/public/main/inc/lib/access_url_edit_sessions_to_url_functions.lib.php
+++ b/public/main/inc/lib/access_url_edit_sessions_to_url_functions.lib.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Definition of the Accessurleditsessiontourl class.
- *
- * @package chamilo.library
  */
 require_once 'xajax/xajax.inc.php';
 
diff --git a/public/main/inc/lib/access_url_edit_users_to_url_functions.lib.php b/public/main/inc/lib/access_url_edit_users_to_url_functions.lib.php
index cc9c05025e..722ec918ab 100644
--- a/public/main/inc/lib/access_url_edit_users_to_url_functions.lib.php
+++ b/public/main/inc/lib/access_url_edit_users_to_url_functions.lib.php
@@ -11,8 +11,6 @@
  * @author Toon Keppens <toon@vi-host.net>
  * @author Julio Montoya - Cleaning code
  * @author Ricardo Rodriguez - Separated the function and code
- *
- * @package chamilo.library
  */
 class AccessUrlEditUsersToUrl
 {
diff --git a/public/main/inc/lib/add_course.lib.inc.php b/public/main/inc/lib/add_course.lib.inc.php
index 9c22d7df50..973c3fa3a0 100644
--- a/public/main/inc/lib/add_course.lib.inc.php
+++ b/public/main/inc/lib/add_course.lib.inc.php
@@ -211,7 +211,7 @@ class AddCourse
     {
         $pictures = [];
         foreach ($files as $value) {
-            if (isset($value[$type]) && $value[$type] != '') {
+            if (isset($value[$type]) && '' != $value[$type]) {
                 $pictures[][$type] = $value[$type];
             }
         }
@@ -239,7 +239,7 @@ class AddCourse
         $authorId = 0
     ) {
         if (is_null($fill_with_exemplary_content)) {
-            $fill_with_exemplary_content = api_get_setting('example_material_course_creation') !== 'false';
+            $fill_with_exemplary_content = 'false' !== api_get_setting('example_material_course_creation');
         }
 
         $course_id = (int) $courseInfo['real_id'];
@@ -259,7 +259,7 @@ class AddCourse
 
         $alert = api_get_setting('email_alert_manager_on_new_quiz');
         $defaultEmailExerciseAlert = 0;
-        if ($alert === 'true') {
+        if ('true' === $alert) {
             $defaultEmailExerciseAlert = 1;
         }
 
@@ -283,7 +283,7 @@ class AddCourse
             'enable_document_auto_launch' => ['default' => 0, 'category' => 'document'],
             'pdf_export_watermark_text' => ['default' => '', 'category' => 'learning_path'],
             'allow_public_certificates' => [
-                'default' => api_get_setting('allow_public_certificates') === 'true' ? 1 : '',
+                'default' => 'true' === api_get_setting('allow_public_certificates') ? 1 : '',
                 'category' => 'certificates',
             ],
             'documents_default_visibility' => ['default' => 'visible', 'category' => 'document'],
@@ -412,7 +412,7 @@ class AddCourse
                         $file->getRealPath()
                     );
 
-                    if ($document && $document->getTitle() === 'default.html') {
+                    if ($document && 'default.html' === $document->getTitle()) {
                         $certificateId = $document->getIid();
                     }
                 }
@@ -640,10 +640,10 @@ class AddCourse
      */
     public static function string2binary($variable)
     {
-        if ($variable == 'true') {
+        if ('true' == $variable) {
             return true;
         }
-        if ($variable == 'false') {
+        if ('false' == $variable) {
             return false;
         }
     }
@@ -691,7 +691,7 @@ class AddCourse
             $visibility = $params['visibility'];
         }
 
-        $subscribe = isset($params['subscribe']) ? (int) $params['subscribe'] : $visibility == COURSE_VISIBILITY_OPEN_PLATFORM ? 1 : 0;
+        $subscribe = isset($params['subscribe']) ? (int) $params['subscribe'] : COURSE_VISIBILITY_OPEN_PLATFORM == $visibility ? 1 : 0;
         $unsubscribe = isset($params['unsubscribe']) ? (int) $params['unsubscribe'] : 0;
         $expiration_date = isset($params['expiration_date']) ? $params['expiration_date'] : null;
         $teachers = isset($params['teachers']) ? $params['teachers'] : null;
@@ -736,16 +736,16 @@ class AddCourse
             $disk_quota = api_get_setting('default_document_quotum');
         }
 
-        if (stripos($department_url, 'http://') === false && stripos(
+        if (false === stripos($department_url, 'http://') && false === stripos(
                 $department_url,
                 'https://'
-            ) === false
+            )
         ) {
             $department_url = 'http://'.$department_url;
         }
 
         // just in case
-        if ($department_url == 'http://') {
+        if ('http://' == $department_url) {
             $department_url = '';
         }
         $course_id = 0;
@@ -756,7 +756,7 @@ class AddCourse
             /** @var \Chamilo\CoreBundle\Entity\CourseCategory $courseCategory */
             $courseCategory = Container::getCourseCategoryRepository()->find($categoryId);
             $urlId = 1;
-            if (api_get_current_access_url_id() !== -1) {
+            if (-1 !== api_get_current_access_url_id()) {
                 $urlId = api_get_current_access_url_id();
             }
 
@@ -855,7 +855,7 @@ class AddCourse
                 $send_mail_to_admin = api_get_setting('send_email_to_admin_when_create_course');
 
                 // @todo Improve code to send to all current portal administrators.
-                if ($send_mail_to_admin === 'true') {
+                if ('true' === $send_mail_to_admin) {
                     $siteName = api_get_setting('siteName');
                     $recipient_email = api_get_setting('emailAdministrator');
                     $recipient_name = api_get_person_name(
@@ -929,7 +929,7 @@ class AddCourse
             'first'
         );
 
-        if ($newIdResultData === false) {
+        if (false === $newIdResultData) {
             return 1;
         }
 
diff --git a/public/main/inc/lib/add_courses_to_session_functions.lib.php b/public/main/inc/lib/add_courses_to_session_functions.lib.php
index 1345652a2c..a02253fd3c 100644
--- a/public/main/inc/lib/add_courses_to_session_functions.lib.php
+++ b/public/main/inc/lib/add_courses_to_session_functions.lib.php
@@ -50,7 +50,7 @@ class AddCourseToSession
                 }
             }
 
-            if ($type == 'single') {
+            if ('single' == $type) {
                 // search users where username or firstname or lastname begins likes $needle
                 $sql = 'SELECT
                             course.id,
@@ -75,8 +75,8 @@ class AddCourseToSession
             if (api_is_multiple_url_enabled()) {
                 $tbl_course_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
                 $access_url_id = api_get_current_access_url_id();
-                if ($access_url_id != -1) {
-                    if ($type == 'single') {
+                if (-1 != $access_url_id) {
+                    if ('single' == $type) {
                         $sql = 'SELECT
                                     course.id,
                                     course.visual_code,
@@ -106,7 +106,7 @@ class AddCourseToSession
 
             $rs = Database::query($sql);
             $course_list = [];
-            if ($type == 'single') {
+            if ('single' == $type) {
                 while ($course = Database::fetch_array($rs)) {
                     $course_list[] = $course['id'];
                     $course_title = str_replace("'", "\'", $course_title);
diff --git a/public/main/inc/lib/agenda.lib.php b/public/main/inc/lib/agenda.lib.php
index 0c272209e0..d65d8d54b8 100644
--- a/public/main/inc/lib/agenda.lib.php
+++ b/public/main/inc/lib/agenda.lib.php
@@ -71,7 +71,7 @@ class Agenda
                 // Check if teacher/admin rights.
                 $isAllowToEdit = api_is_allowed_to_edit(false, true);
                 // Check course setting.
-                if (api_get_course_setting('allow_user_edit_agenda') === '1'
+                if ('1' === api_get_course_setting('allow_user_edit_agenda')
                     && api_is_allowed_in_course()
                 ) {
                     $isAllowToEdit = true;
@@ -253,7 +253,7 @@ class Agenda
     ) {
         $start = api_get_utc_datetime($start, false, true);
         $end = api_get_utc_datetime($end, false, true);
-        $allDay = isset($allDay) && $allDay === 'true' ? 1 : 0;
+        $allDay = isset($allDay) && 'true' === $allDay ? 1 : 0;
         $id = null;
 
         $em = Database::getManager();
@@ -318,30 +318,30 @@ class Agenda
                             $groupEntity
                         );
 
-                        /*api_item_property_update(
-                            $this->course,
-                            TOOL_CALENDAR_EVENT,
-                            $id,
-                            'AgendaAdded',
-                            $senderId,
-                            $groupInfo,
-                            '',
-                            $start,
-                            $end,
-                            $sessionId
-                        );
-                        api_item_property_update(
-                            $this->course,
-                            TOOL_CALENDAR_EVENT,
-                            $id,
-                            'visible',
-                            $senderId,
-                            $groupInfo,
-                            '',
-                            $start,
-                            $end,
-                            $sessionId
-                        );*/
+                    /*api_item_property_update(
+                        $this->course,
+                        TOOL_CALENDAR_EVENT,
+                        $id,
+                        'AgendaAdded',
+                        $senderId,
+                        $groupInfo,
+                        '',
+                        $start,
+                        $end,
+                        $sessionId
+                    );
+                    api_item_property_update(
+                        $this->course,
+                        TOOL_CALENDAR_EVENT,
+                        $id,
+                        'visible',
+                        $senderId,
+                        $groupInfo,
+                        '',
+                        $start,
+                        $end,
+                        $sessionId
+                    );*/
                     } else {
                         // Storing the selected groups
                         if (!empty($sendTo['groups'])) {
@@ -562,7 +562,7 @@ class Agenda
 
             // @todo remove comment code
             $startDateInLocal = new DateTime($newStartDate, new DateTimeZone($timeZone));
-            if ($startDateInLocal->format('I') == 0) {
+            if (0 == $startDateInLocal->format('I')) {
                 // Is saving time? Then fix UTC time to add time
                 $seconds = $startDateInLocal->getOffset();
                 $startDate->add(new DateInterval("PT".$seconds."S"));
@@ -572,7 +572,7 @@ class Agenda
             }
 
             $endDateInLocal = new DateTime($newEndDate, new DateTimeZone($timeZone));
-            if ($endDateInLocal->format('I') == 0) {
+            if (0 == $endDateInLocal->format('I')) {
                 // Is saving time? Then fix UTC time to add time
                 $seconds = $endDateInLocal->getOffset();
                 $endDate->add(new DateInterval("PT".$seconds."S"));
@@ -617,7 +617,7 @@ class Agenda
                 WHERE c_id = $courseId AND id = $eventId";
         $res = Database::query($sql);
 
-        if (Database::num_rows($res) !== 1) {
+        if (1 !== Database::num_rows($res)) {
             return false;
         }
 
@@ -763,7 +763,7 @@ class Agenda
     ) {
         $start = api_get_utc_datetime($start);
         $end = api_get_utc_datetime($end);
-        $allDay = isset($allDay) && $allDay == 'true' ? 1 : 0;
+        $allDay = isset($allDay) && 'true' == $allDay ? 1 : 0;
         $authorId = empty($authorId) ? api_get_user_id() : (int) $authorId;
 
         switch ($this->type) {
@@ -1088,7 +1088,7 @@ class Agenda
                 $sessionId = api_get_session_id();
                 $isAllowToEdit = api_is_allowed_to_edit(null, true);
 
-                if ($isAllowToEdit == false && !empty($sessionId)) {
+                if (false == $isAllowToEdit && !empty($sessionId)) {
                     $allowDhrToEdit = api_get_configuration_value('allow_agenda_edit_for_hrm');
                     if ($allowDhrToEdit) {
                         $isHrm = SessionManager::isUserSubscribedAsHRM(
@@ -1241,7 +1241,7 @@ class Agenda
                     $sessionFilterActive = true;
                 }
 
-                if ($sessionFilterActive == false) {
+                if (false == $sessionFilterActive) {
                     // Getting personal events
                     $this->getPersonalEvents($start, $end);
 
@@ -1320,7 +1320,7 @@ class Agenda
                     }
                 }
 
-                if (!empty($my_course_list) && $sessionFilterActive == false) {
+                if (!empty($my_course_list) && false == $sessionFilterActive) {
                     foreach ($my_course_list as $courseInfoItem) {
                         $courseInfo = api_get_course_info_by_id(
                             $courseInfoItem['real_id']
@@ -1572,10 +1572,10 @@ class Agenda
         $startCondition = '';
         $endCondition = '';
 
-        if ($start !== 0) {
+        if (0 !== $start) {
             $startCondition = "AND date >= '".api_get_utc_datetime($start)."'";
         }
-        if ($start !== 0) {
+        if (0 !== $start) {
             $endCondition = "AND (enddate <= '".api_get_utc_datetime($end)."' OR enddate IS NULL)";
         }
         $user_id = api_get_user_id();
@@ -1607,7 +1607,7 @@ class Agenda
                 }
 
                 $event['description'] = $row['text'];
-                $event['allDay'] = isset($row['all_day']) && $row['all_day'] == 1 ? $row['all_day'] : 0;
+                $event['allDay'] = isset($row['all_day']) && 1 == $row['all_day'] ? $row['all_day'] : 0;
                 $event['parent_event_id'] = 0;
                 $event['has_children'] = 0;
 
@@ -1690,7 +1690,7 @@ class Agenda
             }
 
             if (empty($groups) && empty($users)) {
-                if ($row['to_group_id'] == 0) {
+                if (0 == $row['to_group_id']) {
                     $everyone = true;
                 }
             }
@@ -1841,7 +1841,7 @@ class Agenda
                     // Show all events not added in group
                     $userCondition = ' (links.group IS NULL) ';
                     // admin see only his stuff
-                    if ($this->type === 'personal') {
+                    if ('personal' === $this->type) {
                         $userCondition = " (links.user = ".api_get_user_id()." AND (links.group IS NULL) ";
                         //$userCondition = " (ip.to_user_id = ".api_get_user_id()." AND (ip.to_group_id IS NULL OR ip.to_group_id = 0) ) ";
                         $userCondition .= " OR ( (links.user IS NULL)  AND (links.group IS NULL ))) ";
@@ -1882,7 +1882,6 @@ class Agenda
                     $userCondition .= " ) ";
                 }
                 $userCondition .= " OR (links.user = ".api_get_user_id()." AND (links.group IS NULL )) ";
-
             } else {
                 if (!empty($groupMemberships)) {
                     // Show send to everyone - and only selected groups
@@ -2072,10 +2071,10 @@ class Agenda
             }
 
             $event['editable'] = false;
-            if ($this->getIsAllowedToEdit() && $this->type === 'course') {
+            if ($this->getIsAllowedToEdit() && 'course' === $this->type) {
                 $event['editable'] = true;
                 if (!empty($sessionId)) {
-                    if ($coachCanEdit == false) {
+                    if (false == $coachCanEdit) {
                         $event['editable'] = false;
                     }
                     if ($isAllowToEditByHrm) {
@@ -2099,7 +2098,7 @@ class Agenda
 
             $event['sent_to'] = '';
             $event['type'] = 'course';
-            if ($row->getSessionId() != 0) {
+            if (0 != $row->getSessionId()) {
                 $event['type'] = 'session';
             }
 
@@ -2208,7 +2207,7 @@ class Agenda
                 $event['editable'] = false;
                 $event['type'] = 'admin';
 
-                if (api_is_platform_admin() && $this->type === 'admin') {
+                if (api_is_platform_admin() && 'admin' === $this->type) {
                     $event['editable'] = true;
                 }
 
@@ -2221,7 +2220,7 @@ class Agenda
                     $event['end'] = $this->formatEventDate($row['end_date']);
                     $event['end_date_localtime'] = api_get_local_time($row['end_date']);
                 }
-                $event['allDay'] = isset($row['all_day']) && $row['all_day'] == 1 ? $row['all_day'] : 0;
+                $event['allDay'] = isset($row['all_day']) && 1 == $row['all_day'] ? $row['all_day'] : 0;
                 $event['parent_event_id'] = 0;
                 $event['has_children'] = 0;
                 $event['description'] = $row['content'];
@@ -2325,7 +2324,7 @@ class Agenda
         if (is_array($userList)) {
             $options = [];
             foreach ($userList as $user) {
-                if ($user['status'] == ANONYMOUS) {
+                if (ANONYMOUS == $user['status']) {
                     continue;
                 }
                 $option = [
@@ -2379,7 +2378,7 @@ class Agenda
         $sendTo['everyone'] = false;
         if (is_array($to) && count($to) > 0) {
             foreach ($to as $item) {
-                if ($item == 'everyone') {
+                if ('everyone' == $item) {
                     $sendTo['everyone'] = true;
                 } else {
                     list($type, $id) = explode(':', $item);
@@ -2411,7 +2410,7 @@ class Agenda
         $id = isset($params['id']) ? (int) $params['id'] : 0;
 
         $url = api_get_self().'?action='.$action.'&id='.$id.'&type='.$this->type;
-        if ($this->type == 'course') {
+        if ('course' == $this->type) {
             $url = api_get_self().'?'.api_get_cidreq().'&action='.$action.'&id='.$id.'&type='.$this->type;
         }
 
@@ -2439,7 +2438,7 @@ class Agenda
         $isParentFromSerie = false;
         $showAttachmentForm = true;
 
-        if ($this->type == 'course') {
+        if ('course' == $this->type) {
             // Edition mode.
             if (!empty($id)) {
                 $showAttachmentForm = false;
@@ -2474,7 +2473,7 @@ class Agenda
             $form->addElement('hidden', 'to', 'true');
         } else {
             $sendTo = isset($params['send_to']) ? $params['send_to'] : ['everyone' => true];
-            if ($this->type == 'course') {
+            if ('course' == $this->type) {
                 $this->showToForm($form, $sendTo, [], false, true);
             }
         }
@@ -2487,7 +2486,7 @@ class Agenda
         );
         $form->addElement('checkbox', 'all_day', null, get_lang('All day'));
 
-        if ($this->type == 'course') {
+        if ('course' == $this->type) {
             $repeat = $form->addElement(
                 'checkbox',
                 'repeat',
@@ -2559,7 +2558,7 @@ class Agenda
             ]
         );
 
-        if ($this->type == 'course') {
+        if ('course' == $this->type) {
             $form->addElement('textarea', 'comment', get_lang('Comment'));
             $form->addLabel(
                 get_lang('Files attachments'),
@@ -2654,7 +2653,7 @@ class Agenda
         $addOnlyItemsInSendTo = false,
         $required = false
     ) {
-        if ($this->type != 'course') {
+        if ('course' != $this->type) {
             return false;
         }
 
@@ -2707,7 +2706,7 @@ class Agenda
             $userId = intval($userId);
         }
 
-        if ($visibility == 0) {
+        if (0 == $visibility) {
             api_item_property_update(
                 $courseInfo,
                 TOOL_CALENDAR_EVENT,
@@ -2764,7 +2763,7 @@ class Agenda
                     agenda_id = $eventId";
         $result = Database::query($sql);
         $list = [];
-        if (Database::num_rows($result) != 0) {
+        if (0 != Database::num_rows($result)) {
             $list = Database::store_result($result, 'ASSOC');
         }
 
@@ -2800,7 +2799,7 @@ class Agenda
                     id = $attachmentId
                 ";
         $result = Database::query($sql);
-        if (Database::num_rows($result) != 0) {
+        if (0 != Database::num_rows($result)) {
             $row = Database::fetch_array($result, 'ASSOC');
         }
 
@@ -3039,7 +3038,7 @@ class Agenda
 
         $form = '';
         if (api_is_allowed_to_edit(false, true) ||
-            (api_get_course_setting('allow_user_edit_agenda') == '1' && !api_is_anonymous()) &&
+            ('1' == api_get_course_setting('allow_user_edit_agenda') && !api_is_anonymous()) &&
             api_is_allowed_to_session_edit(false, true)
             || (
                 GroupManager::user_has_access($currentUserId, $groupIid, GroupManager::GROUP_TOOL_CALENDAR)
@@ -3056,7 +3055,7 @@ class Agenda
                 $codePath."calendar/agenda.php?action=importical&type={$this->type}&$cidReq"
             );
 
-            if ($this->type === 'course') {
+            if ('course' === $this->type) {
                 if (!isset($_GET['action'])) {
                     $form = new FormValidator(
                         'form-search',
@@ -3077,7 +3076,7 @@ class Agenda
             }
         }
 
-        if ($this->type == 'personal' && !api_is_anonymous()) {
+        if ('personal' == $this->type && !api_is_anonymous()) {
             $actionsLeft .= Display::url(
                 Display::return_icon('1day.png', get_lang('Sessions plan calendar'), [], ICON_SIZE_MEDIUM),
                 $codePath."calendar/planification.php"
@@ -3091,7 +3090,7 @@ class Agenda
             api_is_session_admin() ||
             api_is_coach()
         ) {
-            if ($this->type == 'personal') {
+            if ('personal' == $this->type) {
                 $form = null;
                 if (!isset($_GET['action'])) {
                     $form = new FormValidator(
@@ -3134,7 +3133,7 @@ class Agenda
         }
 
         $actionsRight = '';
-        if ($view == 'calendar') {
+        if ('calendar' == $view) {
             $actionsRight .= $form;
         }
 
@@ -3247,7 +3246,7 @@ class Agenda
 
                     if (isset($repeat['UNTIL']) && !empty($repeat['UNTIL'])) {
                         // Check if datetime or just date (strlen == 8)
-                        if (strlen($repeat['UNTIL']) == 8) {
+                        if (8 == strlen($repeat['UNTIL'])) {
                             // Fix the datetime format to avoid exception in the next step
                             $repeat['UNTIL'] .= 'T000000';
                         }
@@ -3289,10 +3288,10 @@ class Agenda
         $groupId = null;
         $userId = null;
 
-        if ($filter === 'everyone') {
+        if ('everyone' === $filter) {
             $everyone = true;
         } else {
-            if (substr($filter, 0, 1) === 'G') {
+            if ('G' === substr($filter, 0, 1)) {
                 $groupId = str_replace('GROUP:', '', $filter);
             } else {
                 $userId = str_replace('USER:', '', $filter);
@@ -3340,7 +3339,7 @@ class Agenda
                 $array_course_info['real_id']
             );
             // if the user is administrator of that course we show all the agenda items
-            if ($course_user_status == '1') {
+            if ('1' == $course_user_status) {
                 //echo "course admin";
                 $sqlquery = "SELECT DISTINCT agenda.*, ip.visibility, ip.to_group_id, ip.insert_user_id, ip.ref
 							FROM ".$TABLEAGENDA." agenda,
@@ -3462,12 +3461,12 @@ class Agenda
 
         $current_access_url_id = api_get_current_access_url_id();
 
-        if ($type == "month_view" or $type == "") {
+        if ("month_view" == $type or "" == $type) {
             // We are in month view
             $sql = "SELECT * FROM ".$tbl_global_agenda." WHERE MONTH(start_date) = ".$month." AND YEAR(start_date) = ".$year."  AND access_url_id = $current_access_url_id ORDER BY start_date ASC";
         }
         // 2. creating the SQL statement for getting the personal agenda items in WEEK view
-        if ($type == "week_view") { // we are in week view
+        if ("week_view" == $type) { // we are in week view
             $start_end_day_of_week = self::calculate_start_end_of_week(
                 $week,
                 $year
@@ -3487,7 +3486,7 @@ class Agenda
             $sql = " SELECT * FROM ".$tbl_global_agenda." WHERE start_date>='".$start_filter."' AND start_date<='".$end_filter."' AND  access_url_id = $current_access_url_id ";
         }
         // 3. creating the SQL statement for getting the personal agenda items in DAY view
-        if ($type == "day_view") { // we are in day view
+        if ("day_view" == $type) { // we are in day view
             // we could use mysql date() function but this is only available from 4.1 and higher
             $start_filter = $year."-".$month."-".$day." 00:00:00";
             $start_filter = api_get_utc_datetime($start_filter);
@@ -3523,7 +3522,7 @@ class Agenda
             $minute = $agendatime[1];
             $second = $agendatime[2];
 
-            if ($type == 'month_view') {
+            if ('month_view' == $type) {
                 $item['calendar_type'] = 'global';
                 $agendaitems[$day][] = $item;
                 continue;
@@ -3543,7 +3542,7 @@ class Agenda
 
             // Creating the array that will be returned. If we have week or month view we have an array with the date as the key
             // if we have a day_view we use a half hour as index => key 33 = 16h30
-            if ($type !== "day_view") {
+            if ("day_view" !== $type) {
                 // This is the array construction for the WEEK or MONTH view
                 //Display the Agenda global in the tab agenda (administrator)
                 $agendaitems[$day] .= "<i>$start_time $end_time</i>&nbsp;-&nbsp;";
@@ -3584,14 +3583,14 @@ class Agenda
         $user_id = intval($user_id);
 
         // 1. creating the SQL statement for getting the personal agenda items in MONTH view
-        if ($type == "month_view" or $type == "") {
+        if ("month_view" == $type or "" == $type) {
             // we are in month view
             $sql = "SELECT * FROM ".$tbl_personal_agenda." WHERE user='".$user_id."' and MONTH(date)='".$month."' AND YEAR(date) = '".$year."'  ORDER BY date ASC";
         }
 
         // 2. creating the SQL statement for getting the personal agenda items in WEEK view
         // we are in week view
-        if ($type == "week_view") {
+        if ("week_view" == $type) {
             $start_end_day_of_week = self::calculate_start_end_of_week(
                 $week,
                 $year
@@ -3610,7 +3609,7 @@ class Agenda
             $sql = " SELECT * FROM ".$tbl_personal_agenda." WHERE user='".$user_id."' AND date>='".$start_filter."' AND date<='".$end_filter."'";
         }
         // 3. creating the SQL statement for getting the personal agenda items in DAY view
-        if ($type == "day_view") {
+        if ("day_view" == $type) {
             // we are in day view
             // we could use mysql date() function but this is only available from 4.1 and higher
             $start_filter = $year."-".$month."-".$day." 00:00:00";
@@ -3646,7 +3645,7 @@ class Agenda
             $minute = $agendatime[1];
             $second = $agendatime[2];
 
-            if ($type == 'month_view') {
+            if ('month_view' == $type) {
                 $item['calendar_type'] = 'personal';
                 $item['start_date'] = $item['date'];
                 $agendaitems[$day][] = $item;
@@ -3655,7 +3654,7 @@ class Agenda
 
             // Creating the array that will be returned. If we have week or month view we have an array with the date as the key
             // if we have a day_view we use a half hour as index => key 33 = 16h30
-            if ($type !== "day_view") {
+            if ("day_view" !== $type) {
                 // This is the array construction for the WEEK or MONTH view
 
                 //Display events in agenda
@@ -3711,20 +3710,20 @@ class Agenda
             30,
             31,
         ];
-        if (($year % 400 == 0) or ($year % 4 == 0 and $year % 100 != 0)) {
+        if ((0 == $year % 400) or (0 == $year % 4 and 0 != $year % 100)) {
             $numberofdays[2] = 29;
         }
         //Get the first day of the month
         $dayone = getdate(mktime(0, 0, 0, $month, 1, $year));
         //Start the week on monday
-        $startdayofweek = $dayone['wday'] != 0 ? ($dayone['wday'] - 1) : 6;
+        $startdayofweek = 0 != $dayone['wday'] ? ($dayone['wday'] - 1) : 6;
         $g_cc = (isset($_GET['courseCode']) ? $_GET['courseCode'] : '');
 
-        $next_month = ($month == 1 ? 12 : $month - 1);
-        $prev_month = ($month == 12 ? 1 : $month + 1);
+        $next_month = (1 == $month ? 12 : $month - 1);
+        $prev_month = (12 == $month ? 1 : $month + 1);
 
-        $next_year = ($month == 1 ? $year - 1 : $year);
-        $prev_year = ($month == 12 ? $year + 1 : $year);
+        $next_year = (1 == $month ? $year - 1 : $year);
+        $prev_year = (12 == $month ? $year + 1 : $year);
 
         if ($show_content) {
             $back_url = Display::url(
@@ -3781,7 +3780,7 @@ class Agenda
         while ($curday <= $numberofdays[$month]) {
             $html .= "<tr>";
             for ($ii = 0; $ii < 7; $ii++) {
-                if (($curday == -1) && ($ii == $startdayofweek)) {
+                if ((-1 == $curday) && ($ii == $startdayofweek)) {
                     $curday = 1;
                 }
                 if (($curday > 0) && ($curday <= $numberofdays[$month])) {
@@ -3991,7 +3990,7 @@ class Agenda
                 $user_id
             );
             // if the user is administrator of that course we show all the agenda items
-            if ($course['status'] == '1') {
+            if ('1' == $course['status']) {
                 //echo "course admin";
                 $sqlquery = "SELECT ".
                     " DISTINCT agenda.*, ip.visibility, ip.to_group_id, ip.insert_user_id, ip.ref ".
diff --git a/public/main/inc/lib/api.lib.php b/public/main/inc/lib/api.lib.php
index d8add7320d..cbfc4fd8ee 100644
--- a/public/main/inc/lib/api.lib.php
+++ b/public/main/inc/lib/api.lib.php
@@ -7,7 +7,6 @@ use Chamilo\CoreBundle\Entity\Session as SessionEntity;
 use Chamilo\CoreBundle\Entity\SettingsCurrent;
 use Chamilo\CoreBundle\Framework\Container;
 use Chamilo\CourseBundle\Entity\CGroupInfo;
-use Chamilo\ThemeBundle\Controller\ExceptionController;
 use Chamilo\UserBundle\Entity\User;
 use ChamiloSession as Session;
 use Symfony\Bridge\Twig\Mime\TemplatedEmail;
@@ -788,7 +787,7 @@ function api_get_path($path = '', $configuration = [])
             // Avoid default value
             $defaultValues = ['http://localhost/', 'https://localhost/'];
             if (!empty($urlInfo['url']) && !in_array($urlInfo['url'], $defaultValues)) {
-                $root_web = $urlInfo['active'] == 1 ? $urlInfo['url'] : $configuration['root_web'];
+                $root_web = 1 == $urlInfo['active'] ? $urlInfo['url'] : $configuration['root_web'];
             }
         }
     }
@@ -904,7 +903,7 @@ function api_get_path($path = '', $configuration = [])
  */
 function api_add_trailing_slash($path)
 {
-    return substr($path, -1) == '/' ? $path : $path.'/';
+    return '/' == substr($path, -1) ? $path : $path.'/';
 }
 
 /**
@@ -916,7 +915,7 @@ function api_add_trailing_slash($path)
  */
 function api_remove_trailing_slash($path)
 {
-    return substr($path, -1) == '/' ? substr($path, 0, -1) : $path;
+    return '/' == substr($path, -1) ? substr($path, 0, -1) : $path;
 }
 
 /**
@@ -1053,7 +1052,7 @@ function api_protect_course_script($print_headers = false, $allow_session_admins
         }
 
         //If password is set and user is not registered to the course then the course is not visible
-        if ($isAllowedInCourse == false &&
+        if (false == $isAllowedInCourse &&
             isset($course_info['registration_code']) &&
             !empty($course_info['registration_code'])
         ) {
@@ -1064,7 +1063,7 @@ function api_protect_course_script($print_headers = false, $allow_session_admins
     if (!empty($checkTool)) {
         if (!api_is_allowed_to_edit(true, true, true)) {
             $toolInfo = api_get_tool_information_by_name($checkTool);
-            if (!empty($toolInfo) && isset($toolInfo['visibility']) && $toolInfo['visibility'] == 0) {
+            if (!empty($toolInfo) && isset($toolInfo['visibility']) && 0 == $toolInfo['visibility']) {
                 api_not_allowed(true);
 
                 return false;
@@ -1172,21 +1171,21 @@ function api_get_navigator()
         return ['name' => 'Unknown', 'version' => '0.0.0'];
     }
 
-    if (strpos($_SERVER['HTTP_USER_AGENT'], 'Opera') !== false) {
+    if (false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Opera')) {
         $navigator = 'Opera';
         list(, $version) = explode('Opera', $_SERVER['HTTP_USER_AGENT']);
-    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Edge') !== false) {
+    } elseif (false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Edge')) {
         $navigator = 'Edge';
         list(, $version) = explode('Edge', $_SERVER['HTTP_USER_AGENT']);
-    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false) {
+    } elseif (false !== strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE')) {
         $navigator = 'Internet Explorer';
         list(, $version) = explode('MSIE ', $_SERVER['HTTP_USER_AGENT']);
-    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Chrome') !== false) {
+    } elseif (false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Chrome')) {
         $navigator = 'Chrome';
         list(, $version) = explode('Chrome', $_SERVER['HTTP_USER_AGENT']);
-    } elseif (stripos($_SERVER['HTTP_USER_AGENT'], 'Safari') !== false) {
+    } elseif (false !== stripos($_SERVER['HTTP_USER_AGENT'], 'Safari')) {
         $navigator = 'Safari';
-        if (stripos($_SERVER['HTTP_USER_AGENT'], 'Version/') !== false) {
+        if (false !== stripos($_SERVER['HTTP_USER_AGENT'], 'Version/')) {
             // If this Safari does have the "Version/" string in its user agent
             // then use that as a version indicator rather than what's after
             // "Safari/" which is rather a "build number" or something
@@ -1194,23 +1193,23 @@ function api_get_navigator()
         } else {
             list(, $version) = explode('Safari/', $_SERVER['HTTP_USER_AGENT']);
         }
-    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Firefox') !== false) {
+    } elseif (false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Firefox')) {
         $navigator = 'Firefox';
         list(, $version) = explode('Firefox', $_SERVER['HTTP_USER_AGENT']);
-    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Netscape') !== false) {
+    } elseif (false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Netscape')) {
         $navigator = 'Netscape';
-        if (stripos($_SERVER['HTTP_USER_AGENT'], 'Netscape/') !== false) {
+        if (false !== stripos($_SERVER['HTTP_USER_AGENT'], 'Netscape/')) {
             list(, $version) = explode('Netscape', $_SERVER['HTTP_USER_AGENT']);
         } else {
             list(, $version) = explode('Navigator', $_SERVER['HTTP_USER_AGENT']);
         }
-    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Konqueror') !== false) {
+    } elseif (false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Konqueror')) {
         $navigator = 'Konqueror';
         list(, $version) = explode('Konqueror', $_SERVER['HTTP_USER_AGENT']);
-    } elseif (stripos($_SERVER['HTTP_USER_AGENT'], 'applewebkit') !== false) {
+    } elseif (false !== stripos($_SERVER['HTTP_USER_AGENT'], 'applewebkit')) {
         $navigator = 'AppleWebKit';
         list(, $version) = explode('Version/', $_SERVER['HTTP_USER_AGENT']);
-    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Gecko') !== false) {
+    } elseif (false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Gecko')) {
         $navigator = 'Mozilla';
         list(, $version) = explode('; rv:', $_SERVER['HTTP_USER_AGENT']);
     }
@@ -1218,7 +1217,7 @@ function api_get_navigator()
     // Now cut extra stuff around (mostly *after*) the version number
     $version = preg_replace('/^([\/\s])?([\d\.]+)?.*/', '\2', $version);
 
-    if (strpos($version, '.') === false) {
+    if (false === strpos($version, '.')) {
         $version = number_format(doubleval($version), 1);
     }
     $return = ['name' => $navigator, 'version' => $version];
@@ -1279,7 +1278,7 @@ function api_get_user_courses($userId, $fetch_session = true)
                 cu.user_id = $userId AND
                 cu.relation_type <> ".COURSE_RELATION_TYPE_RRHH;
     $result = Database::query($sql);
-    if ($result === false) {
+    if (false === $result) {
         return [];
     }
 
@@ -1334,11 +1333,11 @@ function _api_format_user($user, $add_password = false, $loadAvatars = true)
     $result['complete_name'] = api_get_person_name($result['firstname'], $result['lastname']);
     $result['complete_name_with_username'] = $result['complete_name'];
 
-    if (!empty($user['username']) && api_get_setting('profile.hide_username_with_complete_name') === 'false') {
+    if (!empty($user['username']) && 'false' === api_get_setting('profile.hide_username_with_complete_name')) {
         $result['complete_name_with_username'] = $result['complete_name'].' ('.$user['username'].')';
     }
 
-    $showEmail = api_get_setting('show_email_addresses') === 'true';
+    $showEmail = 'true' === api_get_setting('show_email_addresses');
     if (!empty($user['email'])) {
         $result['complete_name_with_email_forced'] = $result['complete_name'].' ('.$user['email'].')';
         if ($showEmail) {
@@ -1372,7 +1371,7 @@ function _api_format_user($user, $add_password = false, $loadAvatars = true)
         'user_is_online',
     ];
 
-    if (api_get_setting('extended_profile') === 'true') {
+    if ('true' === api_get_setting('extended_profile')) {
         $attributes[] = 'competences';
         $attributes[] = 'diplomas';
         $attributes[] = 'teach';
@@ -1479,7 +1478,7 @@ function _api_format_user($user, $add_password = false, $loadAvatars = true)
     }
 
     if (isset($user['user_is_online'])) {
-        $result['user_is_online'] = $user['user_is_online'] == true ? 1 : 0;
+        $result['user_is_online'] = true == $user['user_is_online'] ? 1 : 0;
     }
     if (isset($user['user_is_online_in_chat'])) {
         $result['user_is_online_in_chat'] = (int) $user['user_is_online_in_chat'];
@@ -1546,10 +1545,10 @@ function api_get_user_info(
         $userFromSession = Session::read('_user');
 
         if (isset($userFromSession)) {
-            if ($cacheAvailable === true &&
+            if (true === $cacheAvailable &&
                 (
                     empty($userFromSession['is_anonymous']) &&
-                    (isset($userFromSession['status']) && $userFromSession['status'] != ANONYMOUS)
+                    (isset($userFromSession['status']) && ANONYMOUS != $userFromSession['status'])
                 )
             ) {
                 $apcVar = api_get_configuration_value('apc_prefix').'userinfo_'.$userFromSession['user_id'];
@@ -1584,9 +1583,9 @@ function api_get_user_info(
     $user_id = (int) $user_id;
 
     // Re-use user information if not stale and already stored in APCu
-    if ($cacheAvailable === true) {
+    if (true === $cacheAvailable) {
         $apcVar = api_get_configuration_value('apc_prefix').'userinfo_'.$user_id;
-        if (apcu_exists($apcVar) && $updateCache == false && $checkIfUserOnline == false) {
+        if (apcu_exists($apcVar) && false == $updateCache && false == $checkIfUserOnline) {
             $user = apcu_fetch($apcVar);
 
             return $user;
@@ -1610,7 +1609,7 @@ function api_get_user_info(
                     false,
                     true
                 );
-                if ((int) $user_status['user_chat_status'] == 1) {
+                if (1 == (int) $user_status['user_chat_status']) {
                     $user_online_in_chat = 1;
                 }
             }
@@ -1627,7 +1626,7 @@ function api_get_user_info(
         $user = _api_format_user($result_array, $showPassword, $loadAvatars);
     }
 
-    if ($cacheAvailable === true) {
+    if (true === $cacheAvailable) {
         apcu_store($apcVar, $user, 60);
     }
 
@@ -1656,7 +1655,7 @@ function api_get_user_entity($userId)
 function api_get_current_user()
 {
     $isLoggedIn = Container::$container->get('security.authorization_checker')->isGranted('IS_AUTHENTICATED_REMEMBERED');
-    if ($isLoggedIn === false) {
+    if (false === $isLoggedIn) {
         return null;
     }
 
@@ -1938,13 +1937,13 @@ function api_get_cidreq($addSessionId = true, $addGroupId = true, $origin = '')
 
     if ($addSessionId) {
         if (!empty($url)) {
-            $url .= api_get_session_id() == 0 ? '&sid=0' : '&sid='.api_get_session_id();
+            $url .= 0 == api_get_session_id() ? '&sid=0' : '&sid='.api_get_session_id();
         }
     }
 
     if ($addGroupId) {
         if (!empty($url)) {
-            $url .= api_get_group_id() == 0 ? '&gid=0' : '&gid='.api_get_group_id();
+            $url .= 0 == api_get_group_id() ? '&gid=0' : '&gid='.api_get_group_id();
         }
     }
 
@@ -2030,7 +2029,7 @@ function api_get_course_info($course_code = null)
     return $courseInfo;*/
 
     $course = Session::read('_course');
-    if ($course == '-1') {
+    if ('-1' == $course) {
         $course = [];
     }
 
@@ -2341,13 +2340,13 @@ function api_check_password($password)
 
     $isPasswordOk = true;
     foreach ($conditions as $condition) {
-        if ($condition === false) {
+        if (false === $condition) {
             $isPasswordOk = false;
             break;
         }
     }
 
-    if ($isPasswordOk === false) {
+    if (false === $isPasswordOk) {
         $output = get_lang('The new password does not match the minimum security requirements').'<br />';
         $output .= Security::getPasswordRequirementsToString($conditions);
 
@@ -2491,7 +2490,7 @@ function api_get_session_visibility(
 
             // If there is a session duration but there is no previous
             // access by the user, then the session is still available
-            if (count($courseAccess) == 0) {
+            if (0 == count($courseAccess)) {
                 return SESSION_AVAILABLE;
             }
 
@@ -2523,7 +2522,7 @@ function api_get_session_visibility(
     // If the end date was set.
     if (!empty($row['access_end_date'])) {
         // Only if date_start said that it was ok
-        if ($visibility === SESSION_AVAILABLE) {
+        if (SESSION_AVAILABLE === $visibility) {
             $visibility = $now < api_strtotime($row['access_end_date'], 'UTC')
                 ? SESSION_AVAILABLE // Date still available
                 : $row['visibility']; // Session ends
@@ -2542,7 +2541,7 @@ function api_get_session_visibility(
 
         // Test end date.
         if (!empty($row['coach_access_end_date'])) {
-            if ($visibility === SESSION_AVAILABLE) {
+            if (SESSION_AVAILABLE === $visibility) {
                 $endDateCoach = api_strtotime($row['coach_access_end_date'], 'UTC');
                 $visibility = $endDateCoach >= $now ? SESSION_AVAILABLE : $row['visibility'];
             }
@@ -2565,7 +2564,7 @@ function api_get_session_image($sessionId, $statusId)
 {
     $sessionId = (int) $sessionId;
     $image = '';
-    if ($statusId != STUDENT) {
+    if (STUDENT != $statusId) {
         // Check whether is not a student
         if ($sessionId > 0) {
             $image = '&nbsp;&nbsp;'.Display::return_icon(
@@ -2713,7 +2712,7 @@ function api_get_setting($variable)
     }*/
     $value = null;
     if (is_null($key)) {
-        $value = ((isset($_setting[$variable]) && $_setting[$variable] != '') ? $_setting[$variable] : null);
+        $value = ((isset($_setting[$variable]) && '' != $_setting[$variable]) ? $_setting[$variable] : null);
     } else {
         if (isset($_setting[$variable][$key])) {
             $value = $_setting[$variable][$key];
@@ -2763,7 +2762,7 @@ function api_get_plugin_setting($plugin, $variable)
     if ($result) {
         $value = $result['selected_value'];
         $serializedValue = @unserialize($result['selected_value'], []);
-        if ($serializedValue !== false) {
+        if (false !== $serializedValue) {
             $value = $serializedValue;
         }
 
@@ -2853,7 +2852,7 @@ function api_is_platform_admin($allowSessionAdmins = false, $allowDrh = false)
 {
     $currentUser = api_get_current_user();
 
-    if ($currentUser === null) {
+    if (null === $currentUser) {
         return false;
     }
 
@@ -2866,8 +2865,8 @@ function api_is_platform_admin($allowSessionAdmins = false, $allowDrh = false)
     return
         isset($user['status']) &&
         (
-            ($allowSessionAdmins && $user['status'] == SESSIONADMIN) ||
-            ($allowDrh && $user['status'] == DRH)
+            ($allowSessionAdmins && SESSIONADMIN == $user['status']) ||
+            ($allowDrh && DRH == $user['status'])
         );
 }
 
@@ -2888,7 +2887,7 @@ function api_is_platform_admin_by_id($user_id = null, $url = null)
     $admin_table = Database::get_main_table(TABLE_MAIN_ADMIN);
     $sql = "SELECT * FROM $admin_table WHERE user_id = $user_id";
     $res = Database::query($sql);
-    $is_admin = Database::num_rows($res) === 1;
+    $is_admin = 1 === Database::num_rows($res);
     if (!$is_admin || !isset($url)) {
         return $is_admin;
     }
@@ -2898,7 +2897,7 @@ function api_is_platform_admin_by_id($user_id = null, $url = null)
     $sql = "SELECT * FROM $url_user_table
             WHERE access_url_id = $url AND user_id = $user_id";
     $res = Database::query($sql);
-    $result = Database::num_rows($res) === 1;
+    $result = 1 === Database::num_rows($res);
 
     return $result;
 }
@@ -2942,7 +2941,7 @@ function api_is_allowed_to_create_course()
 
     // Teachers can only create courses
     if (api_is_teacher()) {
-        if (api_get_setting('allow_users_to_create_courses') === 'true') {
+        if ('true' === api_get_setting('allow_users_to_create_courses')) {
             return true;
         } else {
             return false;
@@ -3104,7 +3103,7 @@ function api_is_session_admin()
 {
     $user = api_get_user_info();
 
-    return isset($user['status']) && $user['status'] == SESSIONADMIN;
+    return isset($user['status']) && SESSIONADMIN == $user['status'];
 }
 
 /**
@@ -3116,7 +3115,7 @@ function api_is_drh()
 {
     $user = api_get_user_info();
 
-    return isset($user['status']) && $user['status'] == DRH;
+    return isset($user['status']) && DRH == $user['status'];
 }
 
 /**
@@ -3128,7 +3127,7 @@ function api_is_student()
 {
     $user = api_get_user_info();
 
-    return isset($user['status']) && $user['status'] == STUDENT;
+    return isset($user['status']) && STUDENT == $user['status'];
 }
 
 /**
@@ -3140,7 +3139,7 @@ function api_is_teacher()
 {
     $user = api_get_user_info();
 
-    return isset($user['status']) && $user['status'] == COURSEMANAGER;
+    return isset($user['status']) && COURSEMANAGER == $user['status'];
 }
 
 /**
@@ -3152,7 +3151,7 @@ function api_is_invitee()
 {
     $user = api_get_user_info();
 
-    return isset($user['status']) && $user['status'] == INVITEE;
+    return isset($user['status']) && INVITEE == $user['status'];
 }
 
 /**
@@ -3256,27 +3255,27 @@ function api_display_tool_title($title_element)
  */
 function api_display_tool_view_option()
 {
-    if (api_get_setting('student_view_enabled') != 'true') {
+    if ('true' != api_get_setting('student_view_enabled')) {
         return '';
     }
 
     $sourceurl = '';
     $is_framed = false;
     // Exceptions apply for all multi-frames pages
-    if (strpos($_SERVER['REQUEST_URI'], 'chat/chat_banner.php') !== false) {
+    if (false !== strpos($_SERVER['REQUEST_URI'], 'chat/chat_banner.php')) {
         // The chat is a multiframe bit that doesn't work too well with the student_view, so do not show the link
         return '';
     }
 
     // Uncomment to remove student view link from document view page
-    if (strpos($_SERVER['REQUEST_URI'], 'lp/lp_header.php') !== false) {
+    if (false !== strpos($_SERVER['REQUEST_URI'], 'lp/lp_header.php')) {
         if (empty($_GET['lp_id'])) {
             return '';
         }
         $sourceurl = substr($_SERVER['REQUEST_URI'], 0, strpos($_SERVER['REQUEST_URI'], '?'));
         $sourceurl = str_replace(
             'lp/lp_header.php',
-            'lp/lp_controller.php?'.api_get_cidreq().'&action=view&lp_id='.intval($_GET['lp_id']).'&isStudentView='.($_SESSION['studentview'] == 'studentview' ? 'false' : 'true'),
+            'lp/lp_controller.php?'.api_get_cidreq().'&action=view&lp_id='.intval($_GET['lp_id']).'&isStudentView='.('studentview' == $_SESSION['studentview'] ? 'false' : 'true'),
             $sourceurl
         );
         //showinframes doesn't handle student view anyway...
@@ -3286,7 +3285,7 @@ function api_display_tool_view_option()
 
     // Check whether the $_SERVER['REQUEST_URI'] contains already url parameters (thus a questionmark)
     if (!$is_framed) {
-        if (strpos($_SERVER['REQUEST_URI'], '?') === false) {
+        if (false === strpos($_SERVER['REQUEST_URI'], '?')) {
             $sourceurl = api_get_self().'?'.api_get_cidreq();
         } else {
             $sourceurl = $_SERVER['REQUEST_URI'];
@@ -3295,13 +3294,13 @@ function api_display_tool_view_option()
 
     $output_string = '';
     if (!empty($_SESSION['studentview'])) {
-        if ($_SESSION['studentview'] == 'studentview') {
+        if ('studentview' == $_SESSION['studentview']) {
             // We have to remove the isStudentView=true from the $sourceurl
             $sourceurl = str_replace('&isStudentView=true', '', $sourceurl);
             $sourceurl = str_replace('&isStudentView=false', '', $sourceurl);
             $output_string .= '<a class="btn btn-primary btn-sm" href="'.$sourceurl.'&isStudentView=false" target="_self">'.
                 Display::returnFontAwesomeIcon('eye').' '.get_lang('Switch to teacher view').'</a>';
-        } elseif ($_SESSION['studentview'] == 'teacherview') {
+        } elseif ('teacherview' == $_SESSION['studentview']) {
             // Switching to teacherview
             $sourceurl = str_replace('&isStudentView=true', '', $sourceurl);
             $sourceurl = str_replace('&isStudentView=false', '', $sourceurl);
@@ -3345,7 +3344,7 @@ function api_is_allowed_to_edit(
     $session_coach = false,
     $check_student_view = true
 ) {
-    $allowSessionAdminEdit = api_get_setting('session.session_admins_edit_courses_content') === true;
+    $allowSessionAdminEdit = true === api_get_setting('session.session_admins_edit_courses_content');
     // Admins can edit anything.
     if (api_is_platform_admin($allowSessionAdminEdit)) {
         //The student preview was on
@@ -3382,11 +3381,11 @@ function api_is_allowed_to_edit(
     if (!$is_courseAdmin && $coach) {
         // If we also want to check if the user is a coach...';
         // Check if session visibility is read only for coaches.
-        if ($session_visibility == SESSION_VISIBLE_READ_ONLY) {
+        if (SESSION_VISIBLE_READ_ONLY == $session_visibility) {
             $is_allowed_coach_to_edit = false;
         }
 
-        if (api_get_setting('allow_coach_to_edit_course_session') === 'true') {
+        if ('true' === api_get_setting('allow_coach_to_edit_course_session')) {
             // Check if coach is allowed to edit a course.
             $is_courseAdmin = $is_courseAdmin || $is_allowed_coach_to_edit;
         }
@@ -3397,26 +3396,26 @@ function api_is_allowed_to_edit(
     }
 
     // Check if the student_view is enabled, and if so, if it is activated.
-    if (api_get_setting('student_view_enabled') === 'true') {
+    if ('true' === api_get_setting('student_view_enabled')) {
         $studentView = api_is_student_view_active();
         if (!empty($sessionId)) {
             // Check if session visibility is read only for coaches.
-            if ($session_visibility == SESSION_VISIBLE_READ_ONLY) {
+            if (SESSION_VISIBLE_READ_ONLY == $session_visibility) {
                 $is_allowed_coach_to_edit = false;
             }
 
             $is_allowed = false;
-            if (api_get_setting('allow_coach_to_edit_course_session') === 'true') {
+            if ('true' === api_get_setting('allow_coach_to_edit_course_session')) {
                 // Check if coach is allowed to edit a course.
                 $is_allowed = $is_allowed_coach_to_edit;
             }
             if ($check_student_view) {
-                $is_allowed = $is_allowed && $studentView === false;
+                $is_allowed = $is_allowed && false === $studentView;
             }
         } else {
             $is_allowed = $is_courseAdmin;
             if ($check_student_view) {
-                $is_allowed = $is_courseAdmin && $studentView === false;
+                $is_allowed = $is_courseAdmin && false === $studentView;
             }
         }
 
@@ -3452,7 +3451,7 @@ function api_is_coach_of_course_in_session($sessionId)
         false
     );
 
-    if ($visibility != SESSION_VISIBLE && !empty($courseList)) {
+    if (SESSION_VISIBLE != $visibility && !empty($courseList)) {
         // Course Coach session visibility.
         $blockedCourseCount = 0;
         $closedVisibilityList = [
@@ -3471,7 +3470,7 @@ function api_is_coach_of_course_in_session($sessionId)
                 $course['visibility'],
                 $closedVisibilityList
             );
-            if ($courseIsVisible === false || $sessionCourseVisibility == SESSION_INVISIBLE) {
+            if (false === $courseIsVisible || SESSION_INVISIBLE == $sessionCourseVisibility) {
                 $blockedCourseCount++;
             }
         }
@@ -3514,7 +3513,7 @@ function api_is_allowed_to_session_edit($tutor = false, $coach = false)
     } else {
         $sessionId = api_get_session_id();
 
-        if ($sessionId == 0) {
+        if (0 == $sessionId) {
             // I'm not in a session so i will return true to not affect the normal behaviour of Chamilo tools.
             return true;
         } else {
@@ -3562,13 +3561,13 @@ function api_is_allowed($tool, $action, $task_id = 0)
         require_once api_get_path(SYS_CODE_PATH).'permissions/permissions_functions.inc.php';
 
         // Getting the permissions of this user.
-        if ($task_id == 0) {
+        if (0 == $task_id) {
             $user_permissions = get_permissions('user', $_user['user_id']);
             $_SESSION['total_permissions'][$_course['code']] = $user_permissions;
         }
 
         // Getting the permissions of the task.
-        if ($task_id != 0) {
+        if (0 != $task_id) {
             $task_permissions = get_permissions('task', $task_id);
             /* !!! */$_SESSION['total_permissions'][$_course['code']] = $task_permissions;
         }
@@ -3596,11 +3595,11 @@ function api_is_allowed($tool, $action, $task_id = 0)
     }
 
     // If the permissions are limited, we have to map the extended ones to the limited ones.
-    if (api_get_setting('permissions') == 'limited') {
-        if ($action == 'Visibility') {
+    if ('limited' == api_get_setting('permissions')) {
+        if ('Visibility' == $action) {
             $action = 'Edit';
         }
-        if ($action == 'Move') {
+        if ('Move' == $action) {
             $action = 'Edit';
         }
     }
@@ -3635,7 +3634,7 @@ function api_is_anonymous($user_id = null, $db_check = false)
 
         $info = api_get_user_info($user_id);
 
-        if ($info['status'] == 6 || $user_id == 0 || empty($info)) {
+        if (6 == $info['status'] || 0 == $user_id || empty($info)) {
             return true;
         }
     }
@@ -3710,7 +3709,7 @@ function api_get_item_visibility(
     $type = null,
     $group_id = null
 ) {
-    if (!is_array($_course) || count($_course) == 0 || empty($tool) || empty($id)) {
+    if (!is_array($_course) || 0 == count($_course) || empty($tool) || empty($id)) {
         return -1;
     }
 
@@ -3760,7 +3759,7 @@ function api_get_item_visibility(
             LIMIT 1";
 
     $res = Database::query($sql);
-    if ($res === false || Database::num_rows($res) == 0) {
+    if (false === $res || 0 == Database::num_rows($res)) {
         return -1;
     }
     $row = Database::fetch_array($res);
@@ -3949,7 +3948,7 @@ function api_item_property_update(
         $to_filter = " AND to_user_id = $to_user_id $condition_session";
     } else {
         // Set filter to intended group.
-        if (($to_group_id != 0) && $to_group_id == strval(intval($to_group_id))) {
+        if ((0 != $to_group_id) && $to_group_id == strval(intval($to_group_id))) {
             $to_filter = " AND to_group_id = $to_group_id $condition_session";
         }
     }
@@ -4100,7 +4099,7 @@ function api_item_property_update(
     }
 
     // Insert if no entries are found (can only happen in case of $last_edit_type switch is 'default').
-    if ($result == false || Database::affected_rows($result) == 0) {
+    if (false == $result || 0 == Database::affected_rows($result)) {
         $objCourse = $em->find('ChamiloCoreBundle:Course', intval($course_id));
         $objTime = new DateTime('now', new DateTimeZone('UTC'));
         $objUser = api_get_user_entity($user_id);
@@ -4332,7 +4331,7 @@ function api_get_track_item_property_history($tool, $ref)
             WHERE item_property_id = $item_property_id AND course_id = $course_id
             ORDER BY lastedit_date DESC";
     $result = Database::query($sql);
-    if ($result === false or $result === null) {
+    if (false === $result or null === $result) {
         $result = [];
     } else {
         $result = Database::store_result($result, 'ASSOC');
@@ -4718,7 +4717,7 @@ function api_get_visual_theme()
 
         // Platform's theme.
         $visual_theme = $platform_theme;
-        if (api_get_setting('user_selected_theme') == 'true') {
+        if ('true' == api_get_setting('user_selected_theme')) {
             $user_info = api_get_user_info();
             if (isset($user_info['theme'])) {
                 $user_theme = $user_info['theme'];
@@ -4732,10 +4731,10 @@ function api_get_visual_theme()
 
         $course_id = api_get_course_id();
         if (!empty($course_id)) {
-            if (api_get_setting('allow_course_theme') == 'true') {
+            if ('true' == api_get_setting('allow_course_theme')) {
                 $course_theme = api_get_course_setting('course_theme', $course_id);
 
-                if (!empty($course_theme) && $course_theme != -1) {
+                if (!empty($course_theme) && -1 != $course_theme) {
                     if (!empty($course_theme)) {
                         // Course's theme.
                         $visual_theme = $course_theme;
@@ -4743,7 +4742,7 @@ function api_get_visual_theme()
                 }
 
                 $allow_lp_theme = api_get_course_setting('allow_learning_path_theme');
-                if ($allow_lp_theme == 1) {
+                if (1 == $allow_lp_theme) {
                     global $lp_theme_css, $lp_theme_config;
                     // These variables come from the file lp_controller.php.
                     if (!$lp_theme_config) {
@@ -4840,7 +4839,7 @@ function api_max_sort_value($user_course_category, $user_id)
                 relation_type<>".COURSE_RELATION_TYPE_RRHH." AND
                 user_course_cat='".intval($user_course_category)."'";
     $result_max = Database::query($sql);
-    if (Database::num_rows($result_max) == 1) {
+    if (1 == Database::num_rows($result_max)) {
         $row_max = Database::fetch_array($result_max);
 
         return $row_max['max_sort'];
@@ -4864,7 +4863,7 @@ function api_max_sort_value($user_course_category, $user_id)
 function api_time_to_hms($seconds, $space = ':', $showSeconds = true, $roundMinutes = false)
 {
     // $seconds = -1 means that we have wrong data in the db.
-    if ($seconds == -1) {
+    if (-1 == $seconds) {
         return
             get_lang('Unknown').
             Display::return_icon(
@@ -4992,7 +4991,7 @@ function rmdirr($dirname, $delete_only_content_in_folder = false, $strict = fals
     // Simple delete for a file.
     if (is_file($dirname) || is_link($dirname)) {
         $res = unlink($dirname);
-        if ($res === false) {
+        if (false === $res) {
             error_log(__FILE__.' line '.__LINE__.': '.((bool) ini_get('track_errors') ? $php_errormsg : 'Error not recorded because track_errors is off in your php.ini'), 0);
         }
 
@@ -5006,14 +5005,14 @@ function rmdirr($dirname, $delete_only_content_in_folder = false, $strict = fals
     if ($is_object_dir) {
         while (false !== $entry = $dir->read()) {
             // Skip pointers.
-            if ($entry == '.' || $entry == '..') {
+            if ('.' == $entry || '..' == $entry) {
                 continue;
             }
 
             // Recurse.
             if ($strict) {
                 $result = rmdirr("$dirname/$entry");
-                if ($result == false) {
+                if (false == $result) {
                     $res = false;
                     break;
                 }
@@ -5028,9 +5027,9 @@ function rmdirr($dirname, $delete_only_content_in_folder = false, $strict = fals
         $dir->close();
     }
 
-    if ($delete_only_content_in_folder == false) {
+    if (false == $delete_only_content_in_folder) {
         $res = rmdir($dirname);
-        if ($res === false) {
+        if (false === $res) {
             error_log(__FILE__.' line '.__LINE__.': '.((bool) ini_get('track_errors') ? $php_errormsg : 'error not recorded because track_errors is off in your php.ini'), 0);
         }
     }
@@ -5077,7 +5076,7 @@ function copyr($source, $dest, $exclude = [], $copied_files = [])
     $dir = dir($source);
     while (false !== $entry = $dir->read()) {
         // Skip pointers
-        if ($entry == '.' || $entry == '..') {
+        if ('.' == $entry || '..' == $entry) {
             continue;
         }
 
@@ -5148,7 +5147,7 @@ function copy_folder_course_session(
             $rs1 = Database::query($sql);
             $num_rows = Database::num_rows($rs1);
 
-            if ($num_rows == 0) {
+            if (0 == $num_rows) {
                 mkdir($new_pathname, api_get_permissions_for_new_directories());
 
                 // Insert new folder with destination session_id.
@@ -5196,7 +5195,7 @@ function api_chmod_R($path, $filemode)
 
     $handler = opendir($path);
     while ($file = readdir($handler)) {
-        if ($file != '.' && $file != '..') {
+        if ('.' != $file && '..' != $file) {
             $fullpath = "$path/$file";
             if (!is_dir($fullpath)) {
                 if (!chmod($fullpath, $filemode)) {
@@ -5316,7 +5315,7 @@ function api_parse_info_file($filename)
 
             // Create nested arrays.
             foreach ($keys as $key) {
-                if ($key == '') {
+                if ('' == $key) {
                     $key = count($parent);
                 }
                 if (!isset($parent[$key]) || !is_array($parent[$key])) {
@@ -5331,7 +5330,7 @@ function api_parse_info_file($filename)
             }
 
             // Insert actual value.
-            if ($last == '') {
+            if ('' == $last) {
                 $last = count($parent);
             }
             $parent[$last] = $value;
@@ -5541,7 +5540,7 @@ function api_set_setting($var, $value, $subvar = null, $cat = null, $access_url
         $select = "SELECT * FROM $t_settings
                    WHERE variable = '$var' AND access_url = 1 ";
         // Just in case
-        if ($access_url == 1) {
+        if (1 == $access_url) {
             if (!empty($subvar)) {
                 $select .= " AND subkey = '$subvar'";
             }
@@ -5577,7 +5576,7 @@ function api_set_setting($var, $value, $subvar = null, $cat = null, $access_url
             if (Database::num_rows($res) > 0) {
                 // We have a setting for access_url 1, but none for the current one, so create one.
                 $row = Database::fetch_array($res);
-                if ($row['access_url_changeable'] == 1) {
+                if (1 == $row['access_url_changeable']) {
                     $insert = "INSERT INTO $t_settings (variable,subkey, type,category, selected_value,title, comment,scope, subkeytext,access_url, access_url_changeable) VALUES
                             ('".$row['variable']."',".
                         (!empty($row['subkey']) ? "'".$row['subkey']."'" : "NULL").",".
@@ -5637,7 +5636,7 @@ function api_set_settings_category($category, $value = null, $access_url = 1, $f
         }
         $res = Database::query($sql);
 
-        return $res !== false;
+        return false !== $res;
     } else {
         $sql = "UPDATE $t_s SET selected_value = NULL
                 WHERE category = '$category' AND access_url = $access_url";
@@ -5656,7 +5655,7 @@ function api_set_settings_category($category, $value = null, $access_url = 1, $f
         }
         $res = Database::query($sql);
 
-        return $res !== false;
+        return false !== $res;
     }
 }
 
@@ -5715,11 +5714,11 @@ function api_get_access_url($id, $returnDefault = true)
     // root_web setting instead of the current URL
     // This is provided as an option to avoid breaking the storage of URL-specific
     // homepages in home/localhost/
-    if ($id === 1 && $returnDefault === false) {
+    if (1 === $id && false === $returnDefault) {
         $currentUrl = api_get_current_access_url_id();
         // only do this if we are on the main URL (=1), otherwise we could get
         // information on another URL instead of the one asked as parameter
-        if ($currentUrl === 1) {
+        if (1 === $currentUrl) {
             $rootWeb = api_get_path(WEB_PATH);
             $default = 'http://localhost/';
             if ($result['url'] === $default && $rootWeb != $default) {
@@ -5746,10 +5745,10 @@ function &api_get_settings($cat = null, $ordering = 'list', $access_url = 1, $ur
     $table = Database::get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
     $access_url = (int) $access_url;
     $where_condition = '';
-    if ($url_changeable == 1) {
+    if (1 == $url_changeable) {
         $where_condition = " AND access_url_changeable= '1' ";
     }
-    if (empty($access_url) || $access_url == -1) {
+    if (empty($access_url) || -1 == $access_url) {
         $access_url = 1;
     }
     $sql = "SELECT * FROM $table
@@ -5759,13 +5758,13 @@ function &api_get_settings($cat = null, $ordering = 'list', $access_url = 1, $ur
         $cat = Database::escape_string($cat);
         $sql .= " AND category='$cat' ";
     }
-    if ($ordering == 'group') {
+    if ('group' == $ordering) {
         $sql .= " ORDER BY id ASC";
     } else {
         $sql .= " ORDER BY 1,2 ASC";
     }
     $result = Database::query($sql);
-    if ($result === null) {
+    if (null === $result) {
         return [];
     }
     $result = Database::store_result($result, 'ASSOC');
@@ -5866,7 +5865,7 @@ function api_add_setting(
  */
 function api_is_course_visible_for_user($userid = null, $cid = null)
 {
-    if ($userid === null) {
+    if (null === $userid) {
         $userid = api_get_user_id();
     }
     if (empty($userid) || strval(intval($userid)) != $userid) {
@@ -5906,7 +5905,7 @@ function api_is_course_visible_for_user($userid = null, $cid = null)
         $visibility = 0;
     }
     // Shortcut permissions in case the visibility is "open to the world".
-    if ($visibility === COURSE_VISIBILITY_OPEN_WORLD) {
+    if (COURSE_VISIBILITY_OPEN_WORLD === $visibility) {
         return true;
     }
 
@@ -5927,7 +5926,7 @@ function api_is_course_visible_for_user($userid = null, $cid = null)
         // This user has got a recorded state for this course.
         $cuData = Database::fetch_array($result);
         $is_courseMember = true;
-        $is_courseAdmin = ($cuData['status'] == 1);
+        $is_courseAdmin = (1 == $cuData['status']);
     }
 
     if (!$is_courseAdmin) {
@@ -5976,7 +5975,7 @@ function api_is_course_visible_for_user($userid = null, $cid = null)
 
                 $result = Database::query($sql);
 
-                if (Database::result($result, 0, 0) == 1) {
+                if (1 == Database::result($result, 0, 0)) {
                     $is_courseAdmin = true;
                 } else {
                     $is_courseAdmin = false;
@@ -6145,7 +6144,7 @@ function api_request_uri()
  */
 function api_get_current_access_url_id()
 {
-    if (api_get_multiple_access_url() === false) {
+    if (false === api_get_multiple_access_url()) {
         return 1;
     }
 
@@ -6160,7 +6159,7 @@ function api_get_current_access_url_id()
     $result = Database::query($sql);
     if (Database::num_rows($result) > 0) {
         $id = Database::result($result, 0, 0);
-        if ($id === false) {
+        if (false === $id) {
             return -1;
         }
 
@@ -6255,7 +6254,7 @@ function api_is_in_group($groupIdParam = null, $courseCodeParam = null)
 
     $groupId = api_get_group_id();
 
-    if (isset($groupId) && $groupId != '') {
+    if (isset($groupId) && '' != $groupId) {
         if (!empty($groupIdParam)) {
             return $groupIdParam == $groupId;
         } else {
@@ -6297,7 +6296,7 @@ function api_is_user_of_course($course_id, $user_id)
                 relation_type <> '.COURSE_RELATION_TYPE_RRHH.' ';
     $result = Database::query($sql);
 
-    return Database::num_rows($result) == 1;
+    return 1 == Database::num_rows($result);
 }
 
 /**
@@ -6324,7 +6323,7 @@ function api_is_windows_os()
         return false;
     }
 
-    return strtolower(substr((string) $os, 0, 3)) == 'win';
+    return 'win' == strtolower(substr((string) $os, 0, 3));
 }
 
 /**
@@ -6332,7 +6331,7 @@ function api_is_windows_os()
  */
 function api_is_xml_http_request()
 {
-    return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest';
+    return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && 'xmlhttprequest' == strtolower($_SERVER['HTTP_X_REQUESTED_WITH']);
 }
 
 /**
@@ -6482,9 +6481,9 @@ function api_get_tools_lists($my_tool = null)
  */
 function api_check_term_condition($userId)
 {
-    if (api_get_setting('allow_terms_conditions') === 'true') {
+    if ('true' === api_get_setting('allow_terms_conditions')) {
         // Check if exists terms and conditions
-        if (LegalManager::count() == 0) {
+        if (0 == LegalManager::count()) {
             return true;
         }
 
@@ -6595,7 +6594,7 @@ function api_global_admin_can_edit_admin(
         $is_platform_admin = api_is_platform_admin_by_id($my_user_id);
 
         if ($allow_session_admin) {
-            $is_platform_admin = api_is_platform_admin_by_id($my_user_id) || (api_get_user_status($my_user_id) == SESSIONADMIN);
+            $is_platform_admin = api_is_platform_admin_by_id($my_user_id) || (SESSIONADMIN == api_get_user_status($my_user_id));
         }
 
         if ($is_platform_admin) {
@@ -6675,12 +6674,12 @@ function api_browser_support($format = '')
     }
 
     // Native svg support
-    if ($format == 'svg') {
-        if (($current_browser == 'Internet Explorer' && $current_majorver >= 9) ||
-            ($current_browser == 'Firefox' && $current_majorver > 1) ||
-            ($current_browser == 'Safari' && $current_majorver >= 4) ||
-            ($current_browser == 'Chrome' && $current_majorver >= 1) ||
-            ($current_browser == 'Opera' && $current_majorver >= 9)
+    if ('svg' == $format) {
+        if (('Internet Explorer' == $current_browser && $current_majorver >= 9) ||
+            ('Firefox' == $current_browser && $current_majorver > 1) ||
+            ('Safari' == $current_browser && $current_majorver >= 4) ||
+            ('Chrome' == $current_browser && $current_majorver >= 1) ||
+            ('Opera' == $current_browser && $current_majorver >= 9)
         ) {
             $result[$format] = true;
 
@@ -6690,9 +6689,9 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'pdf') {
+    } elseif ('pdf' == $format) {
         // native pdf support
-        if ($current_browser == 'Chrome' && $current_majorver >= 6) {
+        if ('Chrome' == $current_browser && $current_majorver >= 6) {
             $result[$format] = true;
 
             return true;
@@ -6701,9 +6700,9 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'tif' || $format == 'tiff') {
+    } elseif ('tif' == $format || 'tiff' == $format) {
         //native tif support
-        if ($current_browser == 'Safari' && $current_majorver >= 5) {
+        if ('Safari' == $current_browser && $current_majorver >= 5) {
             $result[$format] = true;
 
             return true;
@@ -6712,11 +6711,11 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'ogg' || $format == 'ogx' || $format == 'ogv' || $format == 'oga') {
+    } elseif ('ogg' == $format || 'ogx' == $format || 'ogv' == $format || 'oga' == $format) {
         //native ogg, ogv,oga support
-        if (($current_browser == 'Firefox' && $current_majorver >= 3) ||
-            ($current_browser == 'Chrome' && $current_majorver >= 3) ||
-            ($current_browser == 'Opera' && $current_majorver >= 9)) {
+        if (('Firefox' == $current_browser && $current_majorver >= 3) ||
+            ('Chrome' == $current_browser && $current_majorver >= 3) ||
+            ('Opera' == $current_browser && $current_majorver >= 9)) {
             $result[$format] = true;
 
             return true;
@@ -6725,9 +6724,9 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'mpg' || $format == 'mpeg') {
+    } elseif ('mpg' == $format || 'mpeg' == $format) {
         //native mpg support
-        if (($current_browser == 'Safari' && $current_majorver >= 5)) {
+        if (('Safari' == $current_browser && $current_majorver >= 5)) {
             $result[$format] = true;
 
             return true;
@@ -6736,9 +6735,9 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'mp4') {
+    } elseif ('mp4' == $format) {
         //native mp4 support (TODO: Android, iPhone)
-        if ($current_browser == 'Android' || $current_browser == 'iPhone') {
+        if ('Android' == $current_browser || 'iPhone' == $current_browser) {
             $result[$format] = true;
 
             return true;
@@ -6747,9 +6746,9 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'mov') {
+    } elseif ('mov' == $format) {
         //native mov support( TODO:check iPhone)
-        if ($current_browser == 'Safari' && $current_majorver >= 5 || $current_browser == 'iPhone') {
+        if ('Safari' == $current_browser && $current_majorver >= 5 || 'iPhone' == $current_browser) {
             $result[$format] = true;
 
             return true;
@@ -6758,9 +6757,9 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'avi') {
+    } elseif ('avi' == $format) {
         //native avi support
-        if ($current_browser == 'Safari' && $current_majorver >= 5) {
+        if ('Safari' == $current_browser && $current_majorver >= 5) {
             $result[$format] = true;
 
             return true;
@@ -6769,9 +6768,9 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'wmv') {
+    } elseif ('wmv' == $format) {
         //native wmv support
-        if ($current_browser == 'Firefox' && $current_majorver >= 4) {
+        if ('Firefox' == $current_browser && $current_majorver >= 4) {
             $result[$format] = true;
 
             return true;
@@ -6780,13 +6779,13 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'webm') {
+    } elseif ('webm' == $format) {
         //native webm support (TODO:check IE9, Chrome9, Android)
-        if (($current_browser == 'Firefox' && $current_majorver >= 4) ||
-            ($current_browser == 'Opera' && $current_majorver >= 9) ||
-            ($current_browser == 'Internet Explorer' && $current_majorver >= 9) ||
-            ($current_browser == 'Chrome' && $current_majorver >= 9) ||
-            $current_browser == 'Android'
+        if (('Firefox' == $current_browser && $current_majorver >= 4) ||
+            ('Opera' == $current_browser && $current_majorver >= 9) ||
+            ('Internet Explorer' == $current_browser && $current_majorver >= 9) ||
+            ('Chrome' == $current_browser && $current_majorver >= 9) ||
+            'Android' == $current_browser
         ) {
             $result[$format] = true;
 
@@ -6796,15 +6795,15 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'wav') {
+    } elseif ('wav' == $format) {
         //native wav support (only some codecs !)
-        if (($current_browser == 'Firefox' && $current_majorver >= 4) ||
-            ($current_browser == 'Safari' && $current_majorver >= 5) ||
-            ($current_browser == 'Opera' && $current_majorver >= 9) ||
-            ($current_browser == 'Internet Explorer' && $current_majorver >= 9) ||
-            ($current_browser == 'Chrome' && $current_majorver > 9) ||
-            $current_browser == 'Android' ||
-            $current_browser == 'iPhone'
+        if (('Firefox' == $current_browser && $current_majorver >= 4) ||
+            ('Safari' == $current_browser && $current_majorver >= 5) ||
+            ('Opera' == $current_browser && $current_majorver >= 9) ||
+            ('Internet Explorer' == $current_browser && $current_majorver >= 9) ||
+            ('Chrome' == $current_browser && $current_majorver > 9) ||
+            'Android' == $current_browser ||
+            'iPhone' == $current_browser
         ) {
             $result[$format] = true;
 
@@ -6814,9 +6813,9 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'mid' || $format == 'kar') {
+    } elseif ('mid' == $format || 'kar' == $format) {
         //native midi support (TODO:check Android)
-        if ($current_browser == 'Opera' && $current_majorver >= 9 || $current_browser == 'Android') {
+        if ('Opera' == $current_browser && $current_majorver >= 9 || 'Android' == $current_browser) {
             $result[$format] = true;
 
             return true;
@@ -6825,9 +6824,9 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'wma') {
+    } elseif ('wma' == $format) {
         //native wma support
-        if ($current_browser == 'Firefox' && $current_majorver >= 4) {
+        if ('Firefox' == $current_browser && $current_majorver >= 4) {
             $result[$format] = true;
 
             return true;
@@ -6836,9 +6835,9 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'au') {
+    } elseif ('au' == $format) {
         //native au support
-        if ($current_browser == 'Safari' && $current_majorver >= 5) {
+        if ('Safari' == $current_browser && $current_majorver >= 5) {
             $result[$format] = true;
 
             return true;
@@ -6847,14 +6846,14 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'mp3') {
+    } elseif ('mp3' == $format) {
         //native mp3 support (TODO:check Android, iPhone)
-        if (($current_browser == 'Safari' && $current_majorver >= 5) ||
-            ($current_browser == 'Chrome' && $current_majorver >= 6) ||
-            ($current_browser == 'Internet Explorer' && $current_majorver >= 9) ||
-            $current_browser == 'Android' ||
-            $current_browser == 'iPhone' ||
-            $current_browser == 'Firefox'
+        if (('Safari' == $current_browser && $current_majorver >= 5) ||
+            ('Chrome' == $current_browser && $current_majorver >= 6) ||
+            ('Internet Explorer' == $current_browser && $current_majorver >= 9) ||
+            'Android' == $current_browser ||
+            'iPhone' == $current_browser ||
+            'Firefox' == $current_browser
         ) {
             $result[$format] = true;
 
@@ -6864,15 +6863,15 @@ function api_browser_support($format = '')
 
             return false;
         }
-    } elseif ($format == 'autocapitalize') {
+    } elseif ('autocapitalize' == $format) {
         // Help avoiding showing the autocapitalize option if the browser doesn't
         // support it: this attribute is against the HTML5 standard
-        if ($current_browser == 'Safari' || $current_browser == 'iPhone') {
+        if ('Safari' == $current_browser || 'iPhone' == $current_browser) {
             return true;
         } else {
             return false;
         }
-    } elseif ($format == "check_browser") {
+    } elseif ("check_browser" == $format) {
         $array_check_browser = [$current_browser, $current_majorver];
 
         return $array_check_browser;
@@ -7116,7 +7115,7 @@ function api_get_course_url($courseCode = null, $sessionId = null, $groupId = nu
         // directory not empty, so we do have a course
         $url = api_get_path(WEB_COURSE_PATH).$courseDirectory.'/index.php?id_session='.$sessionId.'&gidReq='.$groupId;
     } elseif (!empty($sessionId) &&
-        api_get_setting('session.remove_session_url') !== 'true'
+        'true' !== api_get_setting('session.remove_session_url')
     ) {
         // if the course was unset and the session was set, send directly to the session
         $url = api_get_path(WEB_CODE_PATH).'session/index.php?session_id='.$sessionId;
@@ -7173,7 +7172,7 @@ function api_resource_is_locked_by_gradebook($item_id, $link_type, $course_code
     if (api_is_platform_admin()) {
         return false;
     }
-    if (api_get_setting('gradebook_locking_enabled') == 'true') {
+    if ('true' == api_get_setting('gradebook_locking_enabled')) {
         if (empty($course_code)) {
             $course_code = api_get_course_id();
         }
@@ -7343,7 +7342,7 @@ function api_check_ip_in_range($ip, $range)
     }
     $ip_ip = ip2long($ip);
     // divide range param into array of elements
-    if (strpos($range, ',') !== false) {
+    if (false !== strpos($range, ',')) {
         $ranges = explode(',', $range);
     } else {
         $ranges = [$range];
@@ -7353,8 +7352,8 @@ function api_check_ip_in_range($ip, $range)
         if (empty($range)) {
             continue;
         }
-        if (strpos($range, '/') === false) {
-            if (strcmp($ip, $range) === 0) {
+        if (false === strpos($range, '/')) {
+            if (0 === strcmp($ip, $range)) {
                 return true; // there is a direct IP match, return OK
             }
             continue; //otherwise, get to the next range
@@ -7391,8 +7390,8 @@ function api_is_global_chat_enabled()
 {
     return
         !api_is_anonymous() &&
-        api_get_setting('allow_global_chat') === 'true' &&
-        api_get_setting('allow_social_tool') === 'true';
+        'true' === api_get_setting('allow_global_chat') &&
+        'true' === api_get_setting('allow_social_tool');
 }
 
 /**
@@ -7460,12 +7459,12 @@ function api_set_default_visibility(
 
     if (isset($setting[$tool_id])) {
         $visibility = 'invisible';
-        if ($setting[$tool_id] == 'true') {
+        if ('true' == $setting[$tool_id]) {
             $visibility = 'visible';
         }
 
         // Read the portal and course default visibility
-        if ($tool_id === 'documents') {
+        if ('documents' === $tool_id) {
             $visibility = DocumentManager::getDocumentDefaultVisibility($courseInfo);
         }
 
@@ -7488,7 +7487,7 @@ function api_set_default_visibility(
                 if (empty($sessionId)) {
                     $objExerciseTmp = new Exercise($courseId);
                     $objExerciseTmp->read($item_id);
-                    if ($visibility == 'visible') {
+                    if ('visible' == $visibility) {
                         $objExerciseTmp->enable();
                         $objExerciseTmp->save();
                     } else {
@@ -7557,10 +7556,10 @@ function api_detect_user_roles($user_id, $courseId, $session_id = 0)
             );
 
             if (!empty($user_status_in_session)) {
-                if ($user_status_in_session == 0) {
+                if (0 == $user_status_in_session) {
                     $user_roles[] = SESSION_STUDENT;
                 }
-                if ($user_status_in_session == 2) {
+                if (2 == $user_status_in_session) {
                     $user_roles[] = SESSION_COURSE_COACH;
                 }
             }
@@ -7629,9 +7628,9 @@ function api_set_settings_and_plugins()
     // access_url == 1 is the default chamilo location
     $settings_by_access_list = [];
     $access_url_id = api_get_current_access_url_id();
-    if ($access_url_id != 1) {
+    if (1 != $access_url_id) {
         $url_info = api_get_access_url($_configuration['access_url']);
-        if ($url_info['active'] == 1) {
+        if (1 == $url_info['active']) {
             $settings_by_access = &api_get_settings(null, 'list', $_configuration['access_url'], 1);
             foreach ($settings_by_access as &$row) {
                 if (empty($row['variable'])) {
@@ -7651,37 +7650,37 @@ function api_set_settings_and_plugins()
     $result = api_get_settings(null, 'list', 1);
 
     foreach ($result as &$row) {
-        if ($access_url_id != 1) {
-            if ($url_info['active'] == 1) {
+        if (1 != $access_url_id) {
+            if (1 == $url_info['active']) {
                 $var = empty($row['variable']) ? 0 : $row['variable'];
                 $subkey = empty($row['subkey']) ? 0 : $row['subkey'];
                 $category = empty($row['category']) ? 0 : $row['category'];
             }
 
-            if ($row['access_url_changeable'] == 1 && $url_info['active'] == 1) {
+            if (1 == $row['access_url_changeable'] && 1 == $url_info['active']) {
                 if (isset($settings_by_access_list[$var]) &&
-                    $settings_by_access_list[$var][$subkey][$category]['selected_value'] != '') {
-                    if ($row['subkey'] == null) {
+                    '' != $settings_by_access_list[$var][$subkey][$category]['selected_value']) {
+                    if (null == $row['subkey']) {
                         $_setting[$row['variable']] = $settings_by_access_list[$var][$subkey][$category]['selected_value'];
                     } else {
                         $_setting[$row['variable']][$row['subkey']] = $settings_by_access_list[$var][$subkey][$category]['selected_value'];
                     }
                 } else {
-                    if ($row['subkey'] == null) {
+                    if (null == $row['subkey']) {
                         $_setting[$row['variable']] = $row['selected_value'];
                     } else {
                         $_setting[$row['variable']][$row['subkey']] = $row['selected_value'];
                     }
                 }
             } else {
-                if ($row['subkey'] == null) {
+                if (null == $row['subkey']) {
                     $_setting[$row['variable']] = $row['selected_value'];
                 } else {
                     $_setting[$row['variable']][$row['subkey']] = $row['selected_value'];
                 }
             }
         } else {
-            if ($row['subkey'] == null) {
+            if (null == $row['subkey']) {
                 $_setting[$row['variable']] = $row['selected_value'];
             } else {
                 $_setting[$row['variable']][$row['subkey']] = $row['selected_value'];
@@ -7730,7 +7729,7 @@ function api_set_more_memory_and_time_limits()
 function api_set_memory_limit($mem)
 {
     //if ini_set() not available, this function is useless
-    if (!function_exists('ini_set') || is_null($mem) || $mem == -1) {
+    if (!function_exists('ini_set') || is_null($mem) || -1 == $mem) {
         return false;
     }
 
@@ -7817,9 +7816,9 @@ function api_get_user_info_from_official_code($officialCode)
 function api_get_password_checker_js($usernameInputId, $passwordInputId)
 {
     $checkPass = api_get_setting('allow_strength_pass_checker');
-    $useStrengthPassChecker = $checkPass === 'true';
+    $useStrengthPassChecker = 'true' === $checkPass;
 
-    if ($useStrengthPassChecker === false) {
+    if (false === $useStrengthPassChecker) {
         return null;
     }
 
@@ -7998,7 +7997,7 @@ function api_drh_can_access_all_session_content()
 {
     $value = api_get_setting('drh_can_access_all_session_content');
 
-    return $value === 'true';
+    return 'true' === $value;
 }
 
 /**
@@ -8142,7 +8141,7 @@ function api_delete_firstpage_parameter()
  */
 function exist_firstpage_parameter()
 {
-    return isset($_COOKIE['GotoCourse']) && $_COOKIE['GotoCourse'] != '';
+    return isset($_COOKIE['GotoCourse']) && '' != $_COOKIE['GotoCourse'];
 }
 
 /**
@@ -8161,16 +8160,16 @@ function api_get_firstpage_parameter()
 function api_is_https()
 {
     if (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) &&
-        $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https' || !empty($_configuration['force_https_forwarded_proto'])
+        'https' == $_SERVER['HTTP_X_FORWARDED_PROTO'] || !empty($_configuration['force_https_forwarded_proto'])
     ) {
         $isSecured = true;
     } else {
-        if (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') {
+        if (!empty($_SERVER['HTTPS']) && 'off' != $_SERVER['HTTPS']) {
             $isSecured = true;
         } else {
             $isSecured = false;
             // last chance
-            if (!empty($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == 443) {
+            if (!empty($_SERVER['SERVER_PORT']) && 443 == $_SERVER['SERVER_PORT']) {
                 $isSecured = true;
             }
         }
@@ -8340,7 +8339,7 @@ function api_is_student_boss()
 {
     $_user = api_get_user_info();
 
-    return isset($_user['status']) && $_user['status'] == STUDENT_BOSS;
+    return isset($_user['status']) && STUDENT_BOSS == $_user['status'];
 }
 
 /**
@@ -8357,7 +8356,7 @@ function api_is_excluded_user_type($checkDB = false, $userId = 0)
     if ($checkDB) {
         $userId = empty($userId) ? api_get_user_id() : (int) $userId;
 
-        if ($userId == 0) {
+        if (0 == $userId) {
             return true;
         }
 
@@ -8396,7 +8395,7 @@ function api_get_users_status_ignored_in_reports($format = 'array')
         ANONYMOUS,
     ];
 
-    if ($format == 'string') {
+    if ('string' == $format) {
         return implode(', ', $excludedTypes);
     }
 
@@ -8442,7 +8441,7 @@ function api_format_time($time, $originFormat = 'php')
         $secs = 0;
     }
 
-    if ($originFormat == 'js') {
+    if ('js' == $originFormat) {
         $formattedTime = trim(sprintf("%02d : %02d : %02d", $hours, $mins, $secs));
     } else {
         $formattedTime = trim(sprintf("%02d$h%02d'%02d\"", $hours, $mins, $secs));
@@ -8711,7 +8710,7 @@ function api_unique_multidim_array($array, $key)
 function api_protect_limit_for_session_admin()
 {
     $limitAdmin = api_get_setting('limit_session_admin_role');
-    if (api_is_session_admin() && $limitAdmin === 'true') {
+    if (api_is_session_admin() && 'true' === $limitAdmin) {
         api_not_allowed(true);
     }
 }
@@ -8736,7 +8735,7 @@ function api_is_student_view_active()
 {
     $studentView = Session::read('studentview');
 
-    return $studentView === 'studentview';
+    return 'studentview' === $studentView;
 }
 
 /**
@@ -8932,7 +8931,7 @@ function location($url, $exit = true)
  */
 function api_get_web_url()
 {
-    if (api_get_setting('server_type') === 'test') {
+    if ('test' === api_get_setting('server_type')) {
         return api_get_path(WEB_PATH).'web/app_dev.php/';
     } else {
         return api_get_path(WEB_PATH).'web/';
diff --git a/public/main/inc/lib/array.lib.php b/public/main/inc/lib/array.lib.php
index f7ce6b19da..6782a5d45a 100644
--- a/public/main/inc/lib/array.lib.php
+++ b/public/main/inc/lib/array.lib.php
@@ -3,8 +3,6 @@
 /**
  * This is the array library for Chamilo.
  * Include/require it in your code to use its functionality.
- *
- * @package chamilo.library
  */
 
 /**
@@ -53,7 +51,7 @@ function msort($array, $id = 'id', $order = 'desc')
         $lowest_id = 0;
         $index = 0;
         foreach ($array as $item) {
-            if ($order == 'desc') {
+            if ('desc' == $order) {
                 if ($item[$id] < $array[$lowest_id][$id]) {
                     $lowest_id = $index;
                 }
diff --git a/public/main/inc/lib/attendance.lib.php b/public/main/inc/lib/attendance.lib.php
index 9c3b257982..f2f2639f09 100644
--- a/public/main/inc/lib/attendance.lib.php
+++ b/public/main/inc/lib/attendance.lib.php
@@ -7,8 +7,6 @@
  *
  * @author Christian Fasanando <christian1827@gmail.com>
  * @author Julio Montoya <gugli100@gmail.com> improvements
- *
- * @package chamilo.attendance
  */
 class Attendance
 {
@@ -52,7 +50,7 @@ class Attendance
 
         $active_plus = '';
 
-        if ((isset($_GET['isStudentView']) && $_GET['isStudentView'] == 'true') ||
+        if ((isset($_GET['isStudentView']) && 'true' == $_GET['isStudentView']) ||
             !api_is_allowed_to_edit(null, true)
         ) {
             $active_plus = ' AND att.active = 1';
@@ -138,7 +136,7 @@ class Attendance
         }
 
         $active_plus = '';
-        if ((isset($_GET['isStudentView']) && $_GET['isStudentView'] == 'true') ||
+        if ((isset($_GET['isStudentView']) && 'true' == $_GET['isStudentView']) ||
             !api_is_allowed_to_edit(null, true)
         ) {
             $active_plus = ' AND att.active = 1';
@@ -176,7 +174,7 @@ class Attendance
                 $session_star = api_get_session_image(api_get_session_id(), $user_info['status']);
             }
 
-            if ($attendance[5] == 1) {
+            if (1 == $attendance[5]) {
                 $isDrhOfCourse = CourseManager::isUserSubscribedInCourseAsDrh(
                     api_get_user_id(),
                     api_get_course_info()
@@ -192,7 +190,7 @@ class Attendance
                 $attendance[1] = '<a class="muted" href="index.php?'.api_get_cidreq().'&action=attendance_sheet_list&attendance_id='.$attendance[0].$student_param.'">'.$attendance[1].'</a>'.$session_star;
             }
 
-            if ($attendance[5] == 1) {
+            if (1 == $attendance[5]) {
                 $attendance[3] = '<center>'.$attendance[3].'</center>';
             } else {
                 $attendance[3] = '<center><span class="muted">'.$attendance[3].'</span></center>';
@@ -207,7 +205,7 @@ class Attendance
                     $actions .= '<a href="index.php?'.api_get_cidreq().'&action=attendance_edit&attendance_id='.$attendance[0].'">'.
                         Display::return_icon('edit.png', get_lang('Edit'), [], ICON_SIZE_SMALL).'</a>&nbsp;';
                     // Visible
-                    if ($attendance[5] == 1) {
+                    if (1 == $attendance[5]) {
                         $actions .= '<a href="index.php?'.api_get_cidreq().'&action=attendance_set_invisible&attendance_id='.$attendance[0].'">'.
                             Display::return_icon('visible.png', get_lang('Hide'), [], ICON_SIZE_SMALL).'</a>';
                     } else {
@@ -215,7 +213,7 @@ class Attendance
                             Display::return_icon('invisible.png', get_lang('Show'), [], ICON_SIZE_SMALL).'</a>';
                         $attendance[2] = '<span class="muted">'.$attendance[2].'</span>';
                     }
-                    if ($allowDelete === 'true') {
+                    if ('true' === $allowDelete) {
                         $actions .= '<a href="index.php?'.api_get_cidreq().'&action=attendance_delete&attendance_id='.$attendance[0].'">'.
                             Display::return_icon('delete.png', get_lang('Delete'), [], ICON_SIZE_SMALL).'</a>';
                     }
@@ -228,7 +226,7 @@ class Attendance
                         $actions .= '<a href="index.php?'.api_get_cidreq().'&action=attendance_edit&attendance_id='.$attendance[0].'">'.
                             Display::return_icon('edit.png', get_lang('Edit'), [], ICON_SIZE_SMALL).'</a>&nbsp;';
 
-                        if ($attendance[5] == 1) {
+                        if (1 == $attendance[5]) {
                             $actions .= ' <a href="index.php?'.api_get_cidreq().'&action=attendance_set_invisible&attendance_id='.$attendance[0].'">'.
                                 Display::return_icon('visible.png', get_lang('Hide'), [], ICON_SIZE_SMALL).'</a>';
                         } else {
@@ -236,7 +234,7 @@ class Attendance
                                 Display::return_icon('invisible.png', get_lang('Show'), [], ICON_SIZE_SMALL).'</a>';
                             $attendance[2] = '<span class="muted">'.$attendance[2].'</span>';
                         }
-                        if ($allowDelete === 'true') {
+                        if ('true' === $allowDelete) {
                             $actions .= ' <a href="index.php?'.api_get_cidreq().'&action=attendance_delete&attendance_id='.$attendance[0].'">'.
                                 Display::return_icon('delete.png', get_lang('Delete'), [], ICON_SIZE_SMALL).'</a>';
                         }
@@ -248,7 +246,7 @@ class Attendance
 
                 if ($is_done_all_calendar) {
                     $locked = $attendance[4];
-                    if ($locked == 0) {
+                    if (0 == $locked) {
                         if (api_is_platform_admin()) {
                             $message_alert = get_lang('Are you sure you want to lock the attendance?');
                         } else {
@@ -590,7 +588,7 @@ class Attendance
         $status = (int) $status;
 
         $action = 'visible';
-        if ($status == 0) {
+        if (0 == $status) {
             $action = 'invisible';
         }
 
@@ -737,9 +735,9 @@ class Attendance
 
             // Not taking into account DRH or COURSEMANAGER
             if ($uid <= 1 ||
-                $status == DRH ||
-                $user_status_in_course == COURSEMANAGER ||
-                $user_status_in_session == 2
+                DRH == $status ||
+                COURSEMANAGER == $user_status_in_course ||
+                2 == $user_status_in_session
             ) {
                 continue;
             }
@@ -811,7 +809,7 @@ class Attendance
             $sql = "SELECT user_id FROM $tbl_attendance_sheet
                     WHERE c_id = $course_id AND user_id='$uid' AND attendance_calendar_id = '$calendar_id'";
             $rs = Database::query($sql);
-            if (Database::num_rows($rs) == 0) {
+            if (0 == Database::num_rows($rs)) {
                 $sql = "INSERT INTO $tbl_attendance_sheet SET
                         c_id = $course_id,
                         user_id = '$uid',
@@ -839,7 +837,7 @@ class Attendance
             $sql = "SELECT user_id FROM $tbl_attendance_sheet
                     WHERE c_id = $course_id AND user_id='$uid' AND attendance_calendar_id = '$calendar_id'";
             $rs = Database::query($sql);
-            if (Database::num_rows($rs) == 0) {
+            if (0 == Database::num_rows($rs)) {
                 $sql = "INSERT INTO $tbl_attendance_sheet SET
                         c_id = $course_id,
                         user_id ='$uid',
@@ -1517,7 +1515,7 @@ class Attendance
                 $row['date'] = api_format_date($row['date_time'], DATE_FORMAT_SHORT);
                 $row['time'] = api_format_date($row['date_time'], TIME_NO_SEC_FORMAT);
                 $row['groups'] = $this->getGroupListByAttendanceCalendar($row['id'], $course_id);
-                if ($type == 'today') {
+                if ('today' == $type) {
                     if (date('d-m-Y', api_strtotime($row['date_time'], 'UTC')) == date('d-m-Y', time())) {
                         $data[] = $row;
                     }
@@ -1915,7 +1913,7 @@ class Attendance
                     attendance_id = '$attendanceId'";
         $rs = Database::query($sql);
 
-        if (Database::num_rows($rs) == 0) {
+        if (0 == Database::num_rows($rs)) {
             $sql = "UPDATE $tbl_attendance_calendar
                     SET date_time='".Database::escape_string($this->date_time)."'
                     WHERE c_id = $course_id AND id = '".intval($calendar_id)."'";
@@ -2076,11 +2074,11 @@ class Attendance
     public function getAttendanceLogin($startDate, $endDate)
     {
         if (empty($startDate) ||
-            $startDate == '0000-00-00' ||
-            $startDate == '0000-00-00 00:00:00' ||
+            '0000-00-00' == $startDate ||
+            '0000-00-00 00:00:00' == $startDate ||
             empty($endDate) ||
-            $endDate == '0000-00-00' ||
-            $endDate == '0000-00-00 00:00:00'
+            '0000-00-00' == $endDate ||
+            '0000-00-00 00:00:00' == $endDate
         ) {
             return false;
         }
diff --git a/public/main/inc/lib/auth.lib.php b/public/main/inc/lib/auth.lib.php
index 1f89ec919b..d2d27dbcd4 100644
--- a/public/main/inc/lib/auth.lib.php
+++ b/public/main/inc/lib/auth.lib.php
@@ -8,8 +8,6 @@
  * It's also used like model to courses_controller (MVC pattern).
  *
  * @author Christian Fasanando <christian1827@gmail.com>
- *
- * @package chamilo.auth
  */
 class Auth
 {
@@ -187,7 +185,7 @@ class Auth
                 // source_course is the course where we clicked the up or down icon
                 $source_course = $course;
                 // target_course is the course before/after the source_course (depending on the up/down icon)
-                if ($direction == 'up') {
+                if ('up' == $direction) {
                     $target_course = $user_courses[$count - 1];
                 } else {
                     $target_course = $user_courses[$count + 1];
@@ -251,7 +249,7 @@ class Auth
                 // source_course is the course where we clicked the up or down icon
                 $source_category = $userCategories[$category2move];
                 // target_course is the course before/after the source_course (depending on the up/down icon)
-                if ($direction == 'up') {
+                if ('up' == $direction) {
                     if (isset($categories[$key - 1])) {
                         $target_category = $userCategories[$categories[$key - 1]['id']];
                     }
@@ -432,7 +430,7 @@ class Auth
                     title='".$category_title."'
                 ORDER BY sort DESC";
         $rs = Database::query($sql);
-        if (Database::num_rows($rs) == 0) {
+        if (0 == Database::num_rows($rs)) {
             $sql = "INSERT INTO $table (user_id, title,sort)
                     VALUES ('".$current_user_id."', '".api_htmlentities($category_title, ENT_QUOTES, api_get_system_encoding())."', '".$nextsort."')";
             $resultQuery = Database::query($sql);
diff --git a/public/main/inc/lib/baker.lib.php b/public/main/inc/lib/baker.lib.php
index 23f916b31f..05a5fd2592 100644
--- a/public/main/inc/lib/baker.lib.php
+++ b/public/main/inc/lib/baker.lib.php
@@ -51,7 +51,7 @@ class PNGImageBaker
         if (array_key_exists($type, $this->_chunks)) {
             foreach (array_keys($this->_chunks[$type]) as $typekey) {
                 list($key, $data) = explode("\0", $this->_chunks[$type][$typekey]);
-                if (strcmp($key, $check) == 0) {
+                if (0 == strcmp($key, $check)) {
                     echo 'Key "'.$check.'" already exists in "'.$type.'" chunk.';
 
                     return false;
@@ -99,7 +99,7 @@ class PNGImageBaker
         // Read the magic bytes and verify
         $retval = substr($png, 0, 8);
         $ipos = 8;
-        if ($retval != "\x89PNG\x0d\x0a\x1a\x0a") {
+        if ("\x89PNG\x0d\x0a\x1a\x0a" != $retval) {
             throw new Exception('Is not a valid PNG image');
         }
         // Loop through the chunks. Byte 0-3 is length, Byte 4-7 is type
@@ -146,7 +146,7 @@ class PNGImageBaker
         // Read the magic bytes and verify
         $retval = substr($png, 0, 8);
         $ipos = 8;
-        if ($retval != "\x89PNG\x0d\x0a\x1a\x0a") {
+        if ("\x89PNG\x0d\x0a\x1a\x0a" != $retval) {
             return false;
         }
 
@@ -157,7 +157,7 @@ class PNGImageBaker
             // Extract length and type from binary data
             $chunk = @unpack('Nsize/a4type', $chunkHeader);
             $skip = false;
-            if ($chunk['type'] == 'tEXt') {
+            if ('tEXt' == $chunk['type']) {
                 $data = substr($png, $ipos, $chunk['size']);
                 $sections = explode("\0", $data);
                 if ($sections[0] == $key) {
diff --git a/public/main/inc/lib/banner.lib.php b/public/main/inc/lib/banner.lib.php
index dbe37d395e..378bec4281 100644
--- a/public/main/inc/lib/banner.lib.php
+++ b/public/main/inc/lib/banner.lib.php
@@ -8,8 +8,6 @@ use ChamiloSession as Session;
  * Code.
  *
  * @todo use globals or parameters or add this file in the template
- *
- * @package chamilo.include
  */
 
 /**
@@ -29,9 +27,9 @@ function getCustomTabs()
     $customTabs = [];
     while ($row = Database::fetch_assoc($result)) {
         $shouldAdd = true;
-        if (strpos($row['subkey'], Plugin::TAB_FILTER_NO_STUDENT) !== false && api_is_student()) {
+        if (false !== strpos($row['subkey'], Plugin::TAB_FILTER_NO_STUDENT) && api_is_student()) {
             $shouldAdd = false;
-        } elseif (strpos($row['subkey'], Plugin::TAB_FILTER_ONLY_STUDENT) !== false && !api_is_student()) {
+        } elseif (false !== strpos($row['subkey'], Plugin::TAB_FILTER_ONLY_STUDENT) && !api_is_student()) {
             $shouldAdd = false;
         }
 
@@ -79,14 +77,14 @@ function accessToWhoIsOnline()
     $user_id = api_get_user_id();
     $course_id = api_get_course_int_id();
     $access = false;
-    if ((api_get_setting('showonline', 'world') === 'true' && !$user_id) ||
-        (api_get_setting('showonline', 'users') === 'true' && $user_id) ||
-        (api_get_setting('showonline', 'course') === 'true' && $user_id && $course_id)
+    if (('true' === api_get_setting('showonline', 'world') && !$user_id) ||
+        ('true' === api_get_setting('showonline', 'users') && $user_id) ||
+        ('true' === api_get_setting('showonline', 'course') && $user_id && $course_id)
     ) {
         $access = true;
     }
 
-    if ($access === true) {
+    if (true === $access) {
         $profileList = api_get_configuration_value('allow_online_users_by_status');
         if (!empty($profileList) && isset($profileList['status'])) {
             $userInfo = api_get_user_info();
@@ -122,8 +120,8 @@ function returnNotificationMenu()
 
         // Display the who's online of the platform
         if ($number &&
-            (api_get_setting('showonline', 'world') == 'true' && !$user_id) ||
-            (api_get_setting('showonline', 'users') == 'true' && $user_id)
+            ('true' == api_get_setting('showonline', 'world') && !$user_id) ||
+            ('true' == api_get_setting('showonline', 'users') && $user_id)
         ) {
             $html .= '<li class="user-online"><a href="'.api_get_path(WEB_PATH).'whoisonline.php" target="_self" title="'
                 .get_lang('Users online').'" >'
@@ -135,7 +133,7 @@ function returnNotificationMenu()
         if ($number_online_in_course &&
             (
                 is_array($courseInfo) &&
-                api_get_setting('showonline', 'course') == 'true' && isset($courseInfo['sysCode'])
+                'true' == api_get_setting('showonline', 'course') && isset($courseInfo['sysCode'])
             )
         ) {
             $html .= '<li class="user-online-course"><a href="'.api_get_path(WEB_PATH).'whoisonline.php?cidReq='.$courseInfo['sysCode']
@@ -181,7 +179,7 @@ function return_navigation_array()
         $menu_navigation[SECTION_CAMPUS] = $possible_tabs[SECTION_CAMPUS];
     }
 
-    if (api_get_setting('course_catalog_published') == 'true' && api_is_anonymous()) {
+    if ('true' == api_get_setting('course_catalog_published') && api_is_anonymous()) {
         $navigation[SECTION_CATALOG] = $possible_tabs[SECTION_CATALOG];
     }
 
@@ -195,7 +193,7 @@ function return_navigation_array()
 
         // My Profile
         if (in_array('my_profile', $tabs) &&
-            api_get_setting('allow_social_tool') != 'true'
+            'true' != api_get_setting('allow_social_tool')
         ) {
             $navigation['myprofile'] = $possible_tabs['myprofile'];
         } else {
@@ -210,7 +208,7 @@ function return_navigation_array()
         }
 
         // Gradebook
-        if (api_get_setting('gradebook_enable') == 'true') {
+        if ('true' == api_get_setting('gradebook_enable')) {
             if (in_array('my_gradebook', $tabs)) {
                 $navigation['mygradebook'] = $possible_tabs['mygradebook'];
             } else {
@@ -235,7 +233,7 @@ function return_navigation_array()
 
         // Social Networking
         if (in_array('social', $tabs)) {
-            if (api_get_setting('allow_social_tool') == 'true') {
+            if ('true' == api_get_setting('allow_social_tool')) {
                 $navigation['social'] = isset($possible_tabs['social']) ? $possible_tabs['social'] : null;
             }
         } else {
@@ -256,7 +254,7 @@ function return_navigation_array()
             $params = ['variable = ? AND subkey = ?' => ['status', 'studentfollowup']];
             $result = api_get_settings_params_simple($params);
             $plugin = StudentFollowUpPlugin::create();
-            if (!empty($result) && $result['selected_value'] === 'installed') {
+            if (!empty($result) && 'installed' === $result['selected_value']) {
                 // Students
                 $url = api_get_path(WEB_PLUGIN_PATH).'studentfollowup/posts.php';
                 if (api_is_platform_admin() || api_is_drh() || api_is_teacher()) {
@@ -282,7 +280,7 @@ function return_navigation_array()
         $customTabs = getCustomTabs();
         if (!empty($customTabs)) {
             foreach ($customTabs as $tab) {
-                if (api_get_setting($tab['variable'], $tab['subkey']) == 'true' &&
+                if ('true' == api_get_setting($tab['variable'], $tab['subkey']) &&
                     isset($possible_tabs[$tab['subkey']])
                 ) {
                     $possible_tabs[$tab['subkey']]['url'] = api_get_path(WEB_PATH).$possible_tabs[$tab['subkey']]['url'];
@@ -300,9 +298,9 @@ function return_navigation_array()
         $customTabs = getCustomTabs();
         if (!empty($customTabs)) {
             foreach ($customTabs as $tab) {
-                if (api_get_setting($tab['variable'], $tab['subkey']) == 'true' &&
+                if ('true' == api_get_setting($tab['variable'], $tab['subkey']) &&
                     isset($possible_tabs[$tab['subkey']]) &&
-                    api_get_plugin_setting(strtolower(str_replace('Tabs', '', $tab['subkeytext'])), 'public_main_menu_tab') == 'true'
+                    'true' == api_get_plugin_setting(strtolower(str_replace('Tabs', '', $tab['subkeytext'])), 'public_main_menu_tab')
                 ) {
                     $possible_tabs[$tab['subkey']]['url'] = api_get_path(WEB_PATH).$possible_tabs[$tab['subkey']]['url'];
                     $navigation[$tab['subkey']] = $possible_tabs[$tab['subkey']];
@@ -424,36 +422,36 @@ function return_breadcrumb($interbreadcrumb, $language_file, $nameTools)
     (which is the tool itself)*/
     if (isset($interbreadcrumb) && is_array($interbreadcrumb)) {
         foreach ($interbreadcrumb as $breadcrumb_step) {
-            if (isset($breadcrumb_step['type']) && $breadcrumb_step['type'] == 'right') {
+            if (isset($breadcrumb_step['type']) && 'right' == $breadcrumb_step['type']) {
                 continue;
             }
-            if ($breadcrumb_step['url'] != '#') {
+            if ('#' != $breadcrumb_step['url']) {
                 $sep = strrchr($breadcrumb_step['url'], '?') ? '&' : '?';
-                $courseParams = strpos($breadcrumb_step['url'], 'cidReq') === false ? api_get_cidreq() : '';
+                $courseParams = false === strpos($breadcrumb_step['url'], 'cidReq') ? api_get_cidreq() : '';
                 $navigation_item['url'] = $breadcrumb_step['url'].$sep.$courseParams;
             } else {
                 $navigation_item['url'] = '#';
             }
             $navigation_item['title'] = $breadcrumb_step['name'];
             // titles for shared folders
-            if ($breadcrumb_step['name'] == 'shared_folder') {
+            if ('shared_folder' == $breadcrumb_step['name']) {
                 $navigation_item['title'] = get_lang('Folders of users');
             } elseif (strstr($breadcrumb_step['name'], 'shared_folder_session_')) {
                 $navigation_item['title'] = get_lang('Folders of users');
             } elseif (strstr($breadcrumb_step['name'], 'sf_user_')) {
                 $userinfo = api_get_user_info(substr($breadcrumb_step['name'], 8));
                 $navigation_item['title'] = $userinfo['complete_name'];
-            } elseif ($breadcrumb_step['name'] == 'chat_files') {
+            } elseif ('chat_files' == $breadcrumb_step['name']) {
                 $navigation_item['title'] = get_lang('Chat conversations history');
-            } elseif ($breadcrumb_step['name'] == 'images') {
+            } elseif ('images' == $breadcrumb_step['name']) {
                 $navigation_item['title'] = get_lang('Images');
-            } elseif ($breadcrumb_step['name'] == 'video') {
+            } elseif ('video' == $breadcrumb_step['name']) {
                 $navigation_item['title'] = get_lang('Video');
-            } elseif ($breadcrumb_step['name'] == 'audio') {
+            } elseif ('audio' == $breadcrumb_step['name']) {
                 $navigation_item['title'] = get_lang('Audio');
-            } elseif ($breadcrumb_step['name'] == 'flash') {
+            } elseif ('flash' == $breadcrumb_step['name']) {
                 $navigation_item['title'] = get_lang('Flash');
-            } elseif ($breadcrumb_step['name'] == 'gallery') {
+            } elseif ('gallery' == $breadcrumb_step['name']) {
                 $navigation_item['title'] = get_lang('Gallery');
             }
             // Fixes breadcrumb title now we applied the Security::remove_XSS and
@@ -468,8 +466,8 @@ function return_breadcrumb($interbreadcrumb, $language_file, $nameTools)
     $navigation_right = [];
     if (isset($interbreadcrumb) && is_array($interbreadcrumb)) {
         foreach ($interbreadcrumb as $breadcrumb_step) {
-            if (isset($breadcrumb_step['type']) && $breadcrumb_step['type'] == 'right') {
-                if ($breadcrumb_step['url'] != '#') {
+            if (isset($breadcrumb_step['type']) && 'right' == $breadcrumb_step['type']) {
+                if ('#' != $breadcrumb_step['url']) {
                     $sep = (strrchr($breadcrumb_step['url'], '?') ? '&amp;' : '?');
                     $navigation_item['url'] = $breadcrumb_step['url'].$sep.api_get_cidreq();
                 } else {
@@ -495,7 +493,7 @@ function return_breadcrumb($interbreadcrumb, $language_file, $nameTools)
     $counter = 0;
     foreach ($navigation as $index => $navigation_info) {
         if (!empty($navigation_info['title'])) {
-            if ($navigation_info['url'] == '#') {
+            if ('#' == $navigation_info['url']) {
                 $final_navigation[$index] = $navigation_info['title'];
             } else {
                 $final_navigation[$index] = '<a href="'.$navigation_info['url'].'" target="_self">'.$navigation_info['title'].'</a>';
@@ -514,7 +512,7 @@ function return_breadcrumb($interbreadcrumb, $language_file, $nameTools)
                 api_is_platform_admin() ||
                 api_is_coach(null, null, false)
             ) &&
-            api_get_setting('student_view_enabled') === 'true' && api_get_course_info()
+            'true' === api_get_setting('student_view_enabled') && api_get_course_info()
         ) {
             $view_as_student_link = api_display_tool_view_option();
 
@@ -587,7 +585,7 @@ function getOnlineUsersCount()
 {
     $number = 0;
     $cacheAvailable = api_get_configuration_value('apc');
-    if ($cacheAvailable === true) {
+    if (true === $cacheAvailable) {
         $apcVar = api_get_configuration_value('apc_prefix').'my_campus_whoisonline_count_simple';
         if (apcu_exists($apcVar)) {
             $number = apcu_fetch($apcVar);
@@ -615,7 +613,7 @@ function getOnlineUsersInCourseCount($userId, $courseInfo)
     $cacheAvailable = api_get_configuration_value('apc');
     $numberOnlineInCourse = 0;
     if (!empty($courseInfo['id'])) {
-        if ($cacheAvailable === true) {
+        if (true === $cacheAvailable) {
             $apcVar = api_get_configuration_value('apc_prefix').'my_campus_whoisonline_count_simple_'.$courseInfo['id'];
             if (apcu_exists($apcVar)) {
                 $numberOnlineInCourse = apcu_fetch($apcVar);
@@ -658,7 +656,7 @@ function getOnlineUsersInSessionCount($sessionId)
         return 0;
     }
 
-    if ($cacheAvailable === true) {
+    if (true === $cacheAvailable) {
         $apcVar = api_get_configuration_value('apc_prefix').'my_campus_whoisonline_session_count_simple_'.$sessionId;
 
         if (apcu_exists($apcVar)) {
diff --git a/public/main/inc/lib/blog.lib.php b/public/main/inc/lib/blog.lib.php
index e9decf0771..ce41c7c949 100644
--- a/public/main/inc/lib/blog.lib.php
+++ b/public/main/inc/lib/blog.lib.php
@@ -125,7 +125,7 @@ class Blog
         $res = Database::query($sql);
         $info_count = Database::result($res, 0, 0);
 
-        if ($info_count == 0) {
+        if (0 == $info_count) {
             // Create the blog
             $params = [
                 'blog_id' => 0,
@@ -687,7 +687,7 @@ class Blog
 
         $tool = 'BLOG_'.$blog_id;
 
-        if ($articleDelete == 'on') {
+        if ('on' == $articleDelete) {
             $sql = "INSERT INTO $tbl_tasks_permissions ( c_id,  task_id, tool, action)
                     VALUES ($course_id, $task_id, '$tool', 'article_delete')";
             Database::query($sql);
@@ -700,7 +700,7 @@ class Blog
             }
         }
 
-        if ($articleEdit == 'on') {
+        if ('on' == $articleEdit) {
             $sql = "
                 INSERT INTO $tbl_tasks_permissions (c_id, task_id, tool, action ) 
                 VALUES ($course_id, $task_id, '$tool', 'article_edit')";
@@ -713,7 +713,7 @@ class Blog
             }
         }
 
-        if ($commentsDelete == 'on') {
+        if ('on' == $commentsDelete) {
             $sql = "
                 INSERT INTO $tbl_tasks_permissions (c_id, task_id, tool, action )
                 VALUES ($course_id, $task_id, '$tool', 'article_comments_delete')";
@@ -774,7 +774,7 @@ class Blog
                 WHERE c_id = $course_id AND task_id = $task_id";
         Database::query($sql);
 
-        if ($articleDelete == 'on') {
+        if ('on' == $articleDelete) {
             $sql = "INSERT INTO $tbl_tasks_permissions ( c_id, task_id, tool, action)
                     VALUES ($course_id, $task_id, '$tool', 'article_delete')";
             Database::query($sql);
@@ -786,7 +786,7 @@ class Blog
             }
         }
 
-        if ($articleEdit == 'on') {
+        if ('on' == $articleEdit) {
             $sql = "INSERT INTO $tbl_tasks_permissions (c_id, task_id, tool, action) 
                     VALUES ($course_id, $task_id, '$tool', 'article_edit')";
             Database::query($sql);
@@ -798,7 +798,7 @@ class Blog
             }
         }
 
-        if ($commentsDelete == 'on') {
+        if ('on' == $commentsDelete) {
             $sql = "INSERT INTO $tbl_tasks_permissions (c_id, task_id, tool, action)
                     VALUES ($course_id, $task_id, '$tool', 'article_comments_delete')";
             Database::query($sql);
@@ -929,7 +929,7 @@ class Blog
         $visibility = $blog['visibility'];
         $title = $blog['blog_name'];
 
-        if ($visibility == 1) {
+        if (1 == $visibility) {
             // Change visibility state, remove from course home.
             $sql = "UPDATE $tbl_blogs SET visibility = '0'
                     WHERE c_id = $course_id AND blog_id ='".(int) $blog_id."' LIMIT 1";
@@ -1056,7 +1056,7 @@ class Blog
 
             return $listArticle;
         } else {
-            if ($filter == '1=1') {
+            if ('1=1' == $filter) {
                 return get_lang('There are no tasks in this project. If you are the manager of this project, click on  link New task to write an task.');
             } else {
                 return get_lang('No tasks have been found. Check the word spelling or try another search.');
@@ -1337,7 +1337,7 @@ class Blog
         $type = Database::escape_string($type);
         $html = null;
 
-        if ($type == 'post') {
+        if ('post' == $type) {
             // Check if the user has already rated this post
             $sql = "SELECT rating_id FROM $tbl_blogs_rating
                     WHERE c_id = $course_id AND
@@ -1347,7 +1347,7 @@ class Blog
                     AND user_id = ".$_user['user_id'];
             $result = Database::query($sql);
             // Add rating
-            if (Database::num_rows($result) == 0) {
+            if (0 == Database::num_rows($result)) {
                 $html .= '<form class="form-horizontal" method="get" action="blog.php" id="frm_rating_'.$type.'_'.$post_id.'" name="frm_rating_'.$type.'_'.$post_id.'">';
                 $html .= '<div class="form-group">';
                 $html .= '<label class="col-sm-3 control-label">'.get_lang('Rate this task').'</label>';
@@ -1371,7 +1371,7 @@ class Blog
                     AND rating_type = '$type'
                     AND user_id = ".$_user['user_id'];
             $result = Database::query($sql);
-            if (Database::num_rows($result) == 0) {
+            if (0 == Database::num_rows($result)) {
                 $html .= '<form class="form-horizontal" method="get" action="blog.php" id="frm_rating_'.$type.'_'.$comment_id.'" name="frm_rating_'.$type.'_'.$comment_id.'">';
                 $html .= '<div class="form-group">';
                 $html .= '<label class="col-sm-3 control-label">'.get_lang('Rate this task').'</label>';
@@ -1548,7 +1548,7 @@ class Blog
         $result = Database::query($sql);
 
         // Add rating
-        if (Database::num_rows($result) == 0) {
+        if (0 == Database::num_rows($result)) {
             $sql = "INSERT INTO $tbl_blogs_rating (c_id, blog_id, rating_type, item_id, user_id, rating )
                     VALUES ($course_id, $blog_id, '$type', $item_id, ".$_user['user_id'].", '$rating')";
             Database::query($sql);
@@ -1744,11 +1744,11 @@ class Blog
 
             while ($task = Database::fetch_array($result)) {
                 $counter++;
-                $css_class = (($counter % 2) == 0) ? "row_odd" : "row_even";
-                $delete_icon = $task['system_task'] == '1' ? "delete_na.png" : "delete.png";
-                $delete_title = $task['system_task'] == '1' ? get_lang('This is a preset task. You can\'t delete a preset task.') : get_lang('Delete this task');
-                $delete_link = $task['system_task'] == '1' ? '#' : api_get_self().'?action=manage_tasks&blog_id='.$task['blog_id'].'&do=delete&task_id='.$task['task_id'].'&'.api_get_cidreq();
-                $delete_confirm = ($task['system_task'] == '1') ? '' : 'onclick="javascript:if(!confirm(\''.addslashes(
+                $css_class = (0 == ($counter % 2)) ? "row_odd" : "row_even";
+                $delete_icon = '1' == $task['system_task'] ? "delete_na.png" : "delete.png";
+                $delete_title = '1' == $task['system_task'] ? get_lang('This is a preset task. You can\'t delete a preset task.') : get_lang('Delete this task');
+                $delete_link = '1' == $task['system_task'] ? '#' : api_get_self().'?action=manage_tasks&blog_id='.$task['blog_id'].'&do=delete&task_id='.$task['task_id'].'&'.api_get_cidreq();
+                $delete_confirm = ('1' == $task['system_task']) ? '' : 'onclick="javascript:if(!confirm(\''.addslashes(
                         api_htmlentities(get_lang("Please confirm your choice"), ENT_QUOTES, $charset)
                     ).'\')) return false;"';
 
@@ -1819,11 +1819,11 @@ class Blog
 
         while ($assignment = Database::fetch_array($result)) {
             $counter++;
-            $css_class = (($counter % 2) == 0) ? "row_odd" : "row_even";
-            $delete_icon = ($assignment['system_task'] == '1') ? "delete_na.png" : "delete.png";
-            $delete_title = ($assignment['system_task'] == '1') ? get_lang('This is a preset task. You can\'t delete a preset task.') : get_lang('Delete this task');
-            $delete_link = ($assignment['system_task'] == '1') ? '#' : api_get_self().'?action=manage_tasks&blog_id='.$assignment['blog_id'].'&do=delete&task_id='.$assignment['task_id'].'&'.api_get_cidreq();
-            $delete_confirm = ($assignment['system_task'] == '1') ? '' : 'onclick="javascript:if(!confirm(\''.addslashes(
+            $css_class = (0 == ($counter % 2)) ? "row_odd" : "row_even";
+            $delete_icon = ('1' == $assignment['system_task']) ? "delete_na.png" : "delete.png";
+            $delete_title = ('1' == $assignment['system_task']) ? get_lang('This is a preset task. You can\'t delete a preset task.') : get_lang('Delete this task');
+            $delete_link = ('1' == $assignment['system_task']) ? '#' : api_get_self().'?action=manage_tasks&blog_id='.$assignment['blog_id'].'&do=delete&task_id='.$assignment['task_id'].'&'.api_get_cidreq();
+            $delete_confirm = ('1' == $assignment['system_task']) ? '' : 'onclick="javascript:if(!confirm(\''.addslashes(
                     api_htmlentities(get_lang("Please confirm your choice"), ENT_QUOTES, $charset)
                 ).'\')) return false;"';
 
@@ -2249,7 +2249,7 @@ class Blog
         $result = Database::query($sql);
         $row = Database::fetch_assoc($result);
 
-        if ($row['number'] == 0) {
+        if (0 == $row['number']) {
             $sql = "
                 INSERT INTO ".$table." (
                     c_id,
@@ -2311,8 +2311,8 @@ class Blog
         $result = Database::query($sql);
         $row = Database::fetch_assoc($result);
 
-        if ($row['number'] == 0 ||
-            ($row['number'] != 0 && $task_id == $old_task_id && $user_id == $old_user_id)
+        if (0 == $row['number'] ||
+            (0 != $row['number'] && $task_id == $old_task_id && $user_id == $old_user_id)
         ) {
             $sql = "UPDATE $tbl_blogs_tasks_rel_user
                 SET
@@ -2365,7 +2365,7 @@ class Blog
         $return = '<span class="blogpost_title">'.get_lang('TaskArticle').' "'.stripslashes($row['title']).'"</span>';
         $return .= '<span style="font-style: italic;"">'.stripslashes($row['description']).'</span><br><br>';
 
-        if (Database::num_rows($result) == 0) {
+        if (0 == Database::num_rows($result)) {
             $return .= get_lang('There are no tasks in this project. If you are the manager of this project, click on  link New task to write an task.');
 
             return $return;
@@ -2479,7 +2479,7 @@ class Blog
             if (!in_array($user['user_id'], $blog_member_ids)) {
                 $a_infosUser = api_get_user_info($user['user_id']);
                 $row = [];
-                $row[] = '<input type="checkbox" name="user[]" value="'.$a_infosUser['user_id'].'" '.((isset($_GET['selectall']) && $_GET['selectall'] == "subscribe") ? ' checked="checked" ' : '').'/>';
+                $row[] = '<input type="checkbox" name="user[]" value="'.$a_infosUser['user_id'].'" '.((isset($_GET['selectall']) && "subscribe" == $_GET['selectall']) ? ' checked="checked" ' : '').'/>';
                 $username = api_htmlentities(sprintf(get_lang('Login: %s'), $a_infosUser["username"]), ENT_QUOTES);
                 if ($is_western_name_order) {
                     $row[] = $a_infosUser["firstname"];
@@ -2590,7 +2590,7 @@ class Blog
         $user_data = [];
         while ($myrow = Database::fetch_array($sql_result)) {
             $row = [];
-            $row[] = '<input type="checkbox" name="user[]" value="'.$myrow['user_id'].'" '.((isset($_GET['selectall']) && $_GET['selectall'] == "unsubscribe") ? ' checked="checked" ' : '').'/>';
+            $row[] = '<input type="checkbox" name="user[]" value="'.$myrow['user_id'].'" '.((isset($_GET['selectall']) && "unsubscribe" == $_GET['selectall']) ? ' checked="checked" ' : '').'/>';
             $username = api_htmlentities(sprintf(get_lang('Login: %s'), $myrow["username"]), ENT_QUOTES);
             if ($is_western_name_order) {
                 $row[] = $myrow["firstname"];
@@ -2625,7 +2625,7 @@ class Blog
                 $task .= stripslashes($r['task']).', ';
             }
             //echo $task;
-            $task = (api_strlen(trim($task)) != 0) ? api_substr($task, 0, api_strlen($task) - 2) : get_lang('Reader');
+            $task = (0 != api_strlen(trim($task))) ? api_substr($task, 0, api_strlen($task) - 2) : get_lang('Reader');
             $row[] = $task;
             //Link to register users
 
@@ -2725,7 +2725,7 @@ class Blog
         //Handle leap year
         $numberofdays = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
 
-        if (($year % 400 == 0) or ($year % 4 == 0 and $year % 100 != 0)) {
+        if ((0 == $year % 400) or (0 == $year % 4 and 0 != $year % 100)) {
             $numberofdays[2] = 29;
         }
 
@@ -2734,13 +2734,13 @@ class Blog
         $monthName = $MonthsLong[$month - 1];
 
         //Start the week on monday
-        $startdayofweek = $dayone['wday'] != 0 ? ($dayone['wday'] - 1) : 6;
+        $startdayofweek = 0 != $dayone['wday'] ? ($dayone['wday'] - 1) : 6;
         $blogId = isset($_GET['blog_id']) ? intval($_GET['blog_id']) : null;
         $filter = isset($_GET['filter']) ? Security::remove_XSS($_GET['filter']) : null;
         $backwardsURL = api_get_self(
-            )."?blog_id=".$blogId."&filter=".$filter."&month=".($month == 1 ? 12 : $month - 1)."&year=".($month == 1 ? $year - 1 : $year);
+            )."?blog_id=".$blogId."&filter=".$filter."&month=".(1 == $month ? 12 : $month - 1)."&year=".(1 == $month ? $year - 1 : $year);
         $forewardsURL = api_get_self(
-            )."?blog_id=".$blogId."&filter=".$filter."&month=".($month == 12 ? 1 : $month + 1)."&year=".($month == 12 ? $year + 1 : $year);
+            )."?blog_id=".$blogId."&filter=".$filter."&month=".(12 == $month ? 1 : $month + 1)."&year=".(12 == $month ? $year + 1 : $year);
 
         // Get posts for this month
         $sql = "SELECT post.*, DAYOFMONTH(date_creation) as post_day, user.lastname, user.firstname
@@ -2818,7 +2818,7 @@ class Blog
         while ($curday <= $numberofdays[$month]) {
             $html .= '<tr>';
             for ($ii = 0; $ii < 7; $ii++) {
-                if (($curday == -1) && ($ii == $startdayofweek)) {
+                if ((-1 == $curday) && ($ii == $startdayofweek)) {
                     $curday = 1;
                 }
 
@@ -2982,8 +2982,8 @@ class Blog
                 $list_body_blog[] = $list_name;
                 $list_body_blog[] = $info_log[1];
 
-                $visibility_icon = ($info_log[2] == 0) ? 'invisible' : 'visible';
-                $visibility_info = ($info_log[2] == 0) ? 'Visible' : 'Invisible';
+                $visibility_icon = (0 == $info_log[2]) ? 'invisible' : 'visible';
+                $visibility_info = (0 == $info_log[2]) ? 'Visible' : 'Invisible';
 
                 $my_image = '<a href="'.api_get_self().'?action=visibility&blog_id='.$info_log[3].'">';
                 $my_image .= Display::return_icon($visibility_icon.'.png', get_lang($visibility_info));
@@ -3059,7 +3059,7 @@ class Blog
 	            $where";
 
         $result = Database::query($sql);
-        if (Database::num_rows($result) != 0) {
+        if (0 != Database::num_rows($result)) {
             $row = Database::fetch_array($result);
         }
 
@@ -3152,7 +3152,7 @@ class Blog
         $result = Database::query($sql);
         $return_data = '';
 
-        if (Database::num_rows($result) != 0) {
+        if (0 != Database::num_rows($result)) {
             while ($row = Database::fetch_array($result)) {
                 $return_data .= '<div class="clear"></div><br />';
                 $return_data .= '<div class="actions" style="margin-left:5px;margin-right:5px;">'.
@@ -3199,7 +3199,7 @@ class Blog
                 ORDER BY blog_name";
         $result = Database::query($sql);
         $return_data = '';
-        if (Database::num_rows($result) != 0) {
+        if (0 != Database::num_rows($result)) {
             while ($row = Database::fetch_array($result)) {
                 $return_data .= '<div class="clear"></div><br />';
                 $return_data .= '<div class="actions" style="margin-left:5px;margin-right:5px;">'.
diff --git a/public/main/inc/lib/career.lib.php b/public/main/inc/lib/career.lib.php
index b9358633e3..120ea324ee 100644
--- a/public/main/inc/lib/career.lib.php
+++ b/public/main/inc/lib/career.lib.php
@@ -124,7 +124,7 @@ class Career extends Model
         $form = new FormValidator('career', 'post', $url);
         // Setting the form elements
         $header = get_lang('Add');
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $header = get_lang('Edit');
         }
 
@@ -146,7 +146,7 @@ class Career extends Model
         $status_list = $this->get_status_list();
         $form->addElement('select', 'status', get_lang('Status'), $status_list);
 
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $extraField = new ExtraField('career');
             $extraField->addElements($form, $id);
 
@@ -360,7 +360,7 @@ class Career extends Model
             foreach ($subGroupList as $subGroupData) {
                 $columns = isset($subGroupData['columns']) ? $subGroupData['columns'] : [];
                 $showGroupLine = true;
-                if (count($columns) == 1) {
+                if (1 == count($columns)) {
                     $showGroupLine = false;
                 }
                 $groupDrawLine[$group] = $showGroupLine;
@@ -377,7 +377,7 @@ class Career extends Model
                             if (!empty($connectionList)) {
                                 $explode = explode('-', $connectionList);
                                 $pos = strpos($explode[0], 'SG');
-                                if ($pos === false) {
+                                if (false === $pos) {
                                     $pos = strpos($explode[0], 'G');
                                     if (is_numeric($pos)) {
                                         // group_123 id
@@ -400,7 +400,7 @@ class Career extends Model
                                 }
 
                                 $pos = strpos($explode[1], 'SG');
-                                if ($pos === false) {
+                                if (false === $pos) {
                                     $pos = strpos($explode[1], 'G');
                                     if (is_numeric($pos)) {
                                         $groupValueId = (int) str_replace(
@@ -558,7 +558,7 @@ class Career extends Model
 
                         $explode = explode('-', $connectionList);
                         $pos = strpos($explode[0], 'SG');
-                        if ($pos === false) {
+                        if (false === $pos) {
                             $pos = strpos($explode[0], 'G');
                             if (is_numeric($pos)) {
                                 // Is group
@@ -583,7 +583,7 @@ class Career extends Model
                         if (isset($explode[1])) {
                             $pos = strpos($explode[1], 'SG');
                         }
-                        if ($pos === false) {
+                        if (false === $pos) {
                             if (isset($explode[1])) {
                                 $pos = strpos($explode[1], 'G');
                                 $value = $explode[1];
@@ -913,7 +913,7 @@ class Career extends Model
                             break;
                     }
 
-                    if (substr($resultId, 0, 1) == 2) {
+                    if (2 == substr($resultId, 0, 1)) {
                         $iconData['Description'] = 'Result Id = '.$resultId;
                     }
 
@@ -1010,11 +1010,11 @@ class Career extends Model
             $found = false;
             if (!empty($arrow)) {
                 $pos = strpos($arrow, 'SG');
-                if ($pos === false) {
+                if (false === $pos) {
                     $pos = strpos($arrow, 'G');
                     if (is_numeric($pos)) {
                         $parts = explode('G', $arrow);
-                        if (empty($parts[0]) && count($parts) == 2) {
+                        if (empty($parts[0]) && 2 == count($parts)) {
                             $groupArrow = $parts[1];
                             $graphHtml .= self::createConnection(
                                 "group_$groupArrow",
@@ -1031,7 +1031,7 @@ class Career extends Model
                 } else {
                     // Case is only one subgroup value example: SG1
                     $parts = explode('SG', $arrow);
-                    if (empty($parts[0]) && count($parts) == 2) {
+                    if (empty($parts[0]) && 2 == count($parts)) {
                         $subGroupArrow = $parts[1];
                         $graphHtml .= self::createConnection(
                             "subgroup_$subGroupArrow",
@@ -1046,10 +1046,10 @@ class Career extends Model
                     }
                 }
 
-                if ($found == false) {
+                if (false == $found) {
                     // case is connected to 2 subgroups: Example SG1-SG2
                     $parts = explode('-', $arrow);
-                    if (count($parts) == 2 && !empty($parts[0]) && !empty($parts[1])) {
+                    if (2 == count($parts) && !empty($parts[0]) && !empty($parts[1])) {
                         $defaultArrow = ['Top', 'Bottom'];
                         $firstPrefix = '';
                         $firstId = '';
@@ -1075,7 +1075,7 @@ class Career extends Model
                     }
                 }
 
-                if ($found == false) {
+                if (false == $found) {
                     // case DrawArrowFrom is an integer
                     $defaultArrow = ['Left', 'Right'];
                     if (isset($groupCourseList[$column]) &&
@@ -1121,12 +1121,12 @@ class Career extends Model
         $topValue = 90;
         $defaultSpace = 40;
         $leftGroup = $defaultSpace.'px';
-        if ($group == 1) {
+        if (1 == $group) {
             $leftGroup = 0;
         }
 
         $groupIdTag = "group_$group";
-        $borderLine = $showGroupLine === true ? 'border-style:solid;' : '';
+        $borderLine = true === $showGroupLine ? 'border-style:solid;' : '';
 
         $graphHtml = '<div 
             id="'.$groupIdTag.'" class="career_group" 
@@ -1158,10 +1158,10 @@ class Career extends Model
             }
             foreach ($columnList as $column => $rows) {
                 $leftColumn = $defaultSpace.'px';
-                if ($column == 1) {
+                if (1 == $column) {
                     $leftColumn = 0;
                 }
-                if (count($columnList) == 1) {
+                if (1 == count($columnList)) {
                     $leftColumn = 0;
                 }
 
@@ -1184,7 +1184,7 @@ class Career extends Model
                     $vertex = isset($rows[$i + 1]) ? $rows[$i + 1] : null;
                     if (!is_null($vertex)) {
                         $subGroup = $vertex->getAttribute('SubGroup');
-                        if ($subGroup == '' || empty($subGroup)) {
+                        if ('' == $subGroup || empty($subGroup)) {
                             $defaultSubGroup = 0;
                         } else {
                             $defaultSubGroup = (int) $subGroup;
@@ -1203,7 +1203,7 @@ class Career extends Model
                 /** @var Vertex $vertex */
                 foreach ($newRowList as $row => $subGroupList) {
                     foreach ($subGroupList as $subGroup => $vertexList) {
-                        if (!empty($subGroup) && $subGroup != -1) {
+                        if (!empty($subGroup) && -1 != $subGroup) {
                             if (!isset($subGroupAdded[$subGroup])) {
                                 $subGroupAdded[$subGroup] = 1;
                             } else {
@@ -1248,11 +1248,11 @@ class Career extends Model
                             $found = false;
                             if (!empty($arrow)) {
                                 $pos = strpos($arrow, 'SG');
-                                if ($pos === false) {
+                                if (false === $pos) {
                                     $pos = strpos($arrow, 'G');
                                     if (is_numeric($pos)) {
                                         $parts = explode('G', $arrow);
-                                        if (empty($parts[0]) && count($parts) == 2) {
+                                        if (empty($parts[0]) && 2 == count($parts)) {
                                             $groupArrow = $parts[1];
                                             $graphHtml .= self::createConnection(
                                                 "group_$groupArrow",
@@ -1264,7 +1264,7 @@ class Career extends Model
                                     }
                                 } else {
                                     $parts = explode('SG', $arrow);
-                                    if (empty($parts[0]) && count($parts) == 2) {
+                                    if (empty($parts[0]) && 2 == count($parts)) {
                                         $subGroupArrow = $parts[1];
                                         $graphHtml .= self::createConnection(
                                             "subgroup_$subGroupArrow",
@@ -1276,7 +1276,7 @@ class Career extends Model
                                 }
                             }
 
-                            if ($found == false) {
+                            if (false == $found) {
                                 $defaultArrow = ['Left', 'Right'];
                                 if (isset($groupCourseList[$group]) &&
                                     in_array($arrow, $groupCourseList[$group])
diff --git a/public/main/inc/lib/certificate.lib.php b/public/main/inc/lib/certificate.lib.php
index ddb55c5932..89b43b2ae3 100644
--- a/public/main/inc/lib/certificate.lib.php
+++ b/public/main/inc/lib/certificate.lib.php
@@ -6,8 +6,6 @@ use Endroid\QrCode\QrCode;
 /**
  * Certificate Class
  * Generate certificates based in the gradebook tool.
- *
- * @package chamilo.library.certificates
  */
 class Certificate extends Model
 {
@@ -169,11 +167,11 @@ class Certificate extends Model
     {
         $delete_db = false;
         if (!empty($this->certificate_data)) {
-            if (!is_null($this->html_file) || $this->html_file != '' || strlen($this->html_file)) {
+            if (!is_null($this->html_file) || '' != $this->html_file || strlen($this->html_file)) {
                 // Deleting HTML file
                 if (is_file($this->html_file)) {
                     @unlink($this->html_file);
-                    if (is_file($this->html_file) === false) {
+                    if (false === is_file($this->html_file)) {
                         $delete_db = true;
                     } else {
                         $delete_db = false;
@@ -206,7 +204,7 @@ class Certificate extends Model
     {
         // The user directory should be set
         if (empty($this->certification_user_path) &&
-            $this->force_certificate_generation === false
+            false === $this->force_certificate_generation
         ) {
             return false;
         }
@@ -254,7 +252,7 @@ class Certificate extends Model
                         if (file_exists($myPathCertificate) &&
                             !empty($name) &&
                             !is_dir($myPathCertificate) &&
-                            $this->force_certificate_generation == false
+                            false == $this->force_certificate_generation
                         ) {
                             // Seems that the file was already generated
                             return true;
@@ -596,7 +594,7 @@ class Certificate extends Model
             return true;
         }
 
-        if (api_get_setting('allow_public_certificates') != 'true') {
+        if ('true' != api_get_setting('allow_public_certificates')) {
             // The "non-public" setting is set, so do not print
             return false;
         }
@@ -617,7 +615,7 @@ class Certificate extends Model
             api_get_course_info($gradeBookInfo['course_code'])
         );
 
-        if ($setting == 0) {
+        if (0 == $setting) {
             // Printing not allowed
             return false;
         }
@@ -746,7 +744,6 @@ class Certificate extends Model
                             true
                         );
 
-
                         // Find time spent in LP
                         $timeSpent = Tracking::get_time_spent_in_lp(
                             $this->user_id,
@@ -780,7 +777,7 @@ class Certificate extends Model
 
         $totalTimeInLearningPaths = 0;
         foreach ($courseList as $courseId => $courseData) {
-            if ($courseData['approved'] === true) {
+            if (true === $courseData['approved']) {
                 $totalTimeInLearningPaths += $courseData['time_spent'];
             }
         }
@@ -859,7 +856,7 @@ class Certificate extends Model
         $params['right'] = 0;
         $params['top'] = 0;
         $params['bottom'] = 0;
-        $page_format = $params['orientation'] == 'landscape' ? 'A4-L' : 'A4';
+        $page_format = 'landscape' == $params['orientation'] ? 'A4-L' : 'A4';
         $pdf = new PDF($page_format, $params['orientation'], $params);
 
         $pdf->html_to_pdf(
diff --git a/public/main/inc/lib/chat.lib.php b/public/main/inc/lib/chat.lib.php
index 3caf99b3fb..fdc614ed5c 100644
--- a/public/main/inc/lib/chat.lib.php
+++ b/public/main/inc/lib/chat.lib.php
@@ -7,8 +7,6 @@ use ChamiloSession as Session;
  * Class Chat.
  *
  * @todo ChamiloSession instead of $_SESSION
- *
- * @package chamilo.library.chat
  */
 class Chat extends Model
 {
@@ -369,7 +367,7 @@ class Chat extends Model
     ) {
         $relation = SocialManager::get_relation_between_contacts($fromUserId, $to_user_id);
 
-        if ($relation == USER_RELATION_TYPE_FRIEND) {
+        if (USER_RELATION_TYPE_FRIEND == $relation) {
             $now = api_get_utc_datetime();
             $user_info = api_get_user_info($to_user_id, true);
             $this->saveWindow($to_user_id);
@@ -493,7 +491,7 @@ class Chat extends Model
     {
         $status = Session::read('disable_chat');
         if (!empty($status)) {
-            if ($status == true) {
+            if (true == $status) {
                 Session::write('disable_chat', null);
 
                 return true;
@@ -511,7 +509,7 @@ class Chat extends Model
         $currentExercises = Session::read('current_exercises');
         if (!empty($currentExercises)) {
             foreach ($currentExercises as $attempt_status) {
-                if ($attempt_status == true) {
+                if (true == $attempt_status) {
                     return true;
                 }
             }
diff --git a/public/main/inc/lib/conditional_login.class.php b/public/main/inc/lib/conditional_login.class.php
index 615f70889d..2899bfcf30 100644
--- a/public/main/inc/lib/conditional_login.class.php
+++ b/public/main/inc/lib/conditional_login.class.php
@@ -24,7 +24,7 @@ class ConditionalLogin
                     if (isset($condition['conditional_function'])) {
                         $function = $condition['conditional_function'];
                         $result = $function($user);
-                        if ($result == false) {
+                        if (false == $result) {
                             $_SESSION['conditional_login']['uid'] = $user['user_id'];
                             $_SESSION['conditional_login']['can_login'] = false;
                             header("Location: ".$condition['url']);
diff --git a/public/main/inc/lib/course.lib.php b/public/main/inc/lib/course.lib.php
index 3dcf944e9c..43da2506ad 100644
--- a/public/main/inc/lib/course.lib.php
+++ b/public/main/inc/lib/course.lib.php
@@ -102,7 +102,7 @@ class CourseManager
                 'hosting_limit_courses',
                 'PortalCoursesLimitReached'
             );
-            if ($return != false) {
+            if (false != $return) {
                 return $return;
             }
             $return = self::checkCreateCourseAccessUrlParam(
@@ -111,7 +111,7 @@ class CourseManager
                 'hosting_limit_active_courses',
                 'PortalActiveCoursesLimitReached'
             );
-            if ($return != false) {
+            if (false != $return) {
                 return $return;
             }
         }
@@ -124,7 +124,7 @@ class CourseManager
             $params['wanted_code'] = $params['title'];
             // Check whether the requested course code has already been occupied.
             $substring = api_substr($params['title'], 0, self::MAX_COURSE_LENGTH_CODE);
-            if ($substring === false || empty($substring)) {
+            if (false === $substring || empty($substring)) {
                 return false;
             } else {
                 $params['wanted_code'] = self::generate_course_code($substring);
@@ -231,12 +231,12 @@ class CourseManager
                 $sql .= "OR code LIKE '".Database::escape_string($startwith)."%' ";
             }
             $sql .= ') ';
-            if ($visibility !== -1) {
+            if (-1 !== $visibility) {
                 $sql .= " AND visibility = $visibility ";
             }
         } else {
             $sql .= 'WHERE 1 ';
-            if ($visibility !== -1) {
+            if (-1 !== $visibility) {
                 $sql .= " AND visibility = $visibility ";
             }
         }
@@ -288,7 +288,7 @@ class CourseManager
         if (!in_array($orderdirection, ['ASC', 'DESC'])) {
             $sql .= 'ASC';
         } else {
-            $sql .= ($orderdirection == 'ASC' ? 'ASC' : 'DESC');
+            $sql .= ('ASC' == $orderdirection ? 'ASC' : 'DESC');
         }
 
         if (!empty($howmany) && is_int($howmany) and $howmany > 0) {
@@ -430,7 +430,7 @@ class CourseManager
             $user_id = [$user_id];
         }
 
-        if (count($user_id) == 0) {
+        if (0 == count($user_id)) {
             return false;
         }
 
@@ -518,7 +518,7 @@ class CourseManager
                         WHERE session_id = $session_id AND user_id = $uid";
                 $rs = Database::query($sql);
 
-                if (Database::num_rows($rs) == 0) {
+                if (0 == Database::num_rows($rs)) {
                     SessionManager::unsubscribe_user_from_session($uid, $session_id);
                 }
             }
@@ -657,7 +657,7 @@ class CourseManager
         $userCourseCategoryId = (int) $userCourseCategoryId;
 
         $sessionId = empty($sessionId) ? api_get_session_id() : (int) $sessionId;
-        $status = $status === STUDENT || $status === COURSEMANAGER ? $status : STUDENT;
+        $status = STUDENT === $status || COURSEMANAGER === $status ? $status : STUDENT;
         $courseUserTable = Database::get_main_table(TABLE_MAIN_COURSE_USER);
 
         if (!empty($sessionId)) {
@@ -704,20 +704,20 @@ class CourseManager
 
             if ($checkTeacherPermission && !api_is_course_admin()) {
                 // Check in advance whether subscription is allowed or not for this course.
-                if ((int) $courseInfo['subscribe'] === SUBSCRIBE_NOT_ALLOWED) {
+                if (SUBSCRIBE_NOT_ALLOWED === (int) $courseInfo['subscribe']) {
                     Display::addFlash(Display::return_message(get_lang('SubscriptionNotAllowed'), 'warning'));
 
                     return false;
                 }
             }
 
-            if ($status === STUDENT) {
+            if (STUDENT === $status) {
                 // Check if max students per course extra field is set
                 $extraFieldValue = new ExtraFieldValue('course');
                 $value = $extraFieldValue->get_values_by_handler_and_field_variable($courseId, 'max_subscribed_students');
                 if (!empty($value) && isset($value['value'])) {
                     $maxStudents = $value['value'];
-                    if ($maxStudents !== '') {
+                    if ('' !== $maxStudents) {
                         $maxStudents = (int) $maxStudents;
                         $count = self::get_user_list_from_course_code(
                             $courseCode,
@@ -762,13 +762,13 @@ class CourseManager
 
                 $send = api_get_course_setting('email_alert_to_teacher_on_new_user_in_course', $courseInfo);
 
-                if ($send == 1) {
+                if (1 == $send) {
                     self::email_to_tutor(
                         $userId,
                         $courseInfo['real_id'],
                         false
                     );
-                } elseif ($send == 2) {
+                } elseif (2 == $send) {
                     self::email_to_tutor(
                         $userId,
                         $courseInfo['real_id'],
@@ -777,7 +777,7 @@ class CourseManager
                 }
 
                 $subscribe = (int) api_get_course_setting('subscribe_users_to_forum_notifications', $courseInfo);
-                if ($subscribe === 1) {
+                if (1 === $subscribe) {
                     require_once api_get_path(SYS_CODE_PATH).'forum/forumfunction.inc.php';
                     $forums = get_forums(0, $courseCode, true, $sessionId);
                     foreach ($forums as $forum) {
@@ -903,7 +903,7 @@ class CourseManager
 
         // Check in advance whether the user has already been registered on the platform.
         $sql = "SELECT status FROM ".$userTable." WHERE user_id = $userId ";
-        if (Database::num_rows(Database::query($sql)) == 0) {
+        if (0 == Database::num_rows(Database::query($sql))) {
             if ($debug) {
                 error_log('The user has not been registered to the platform');
             }
@@ -1038,7 +1038,7 @@ class CourseManager
         if (api_get_multiple_access_url()) {
             $tbl_course_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql = "
                     SELECT
                         course.code,
@@ -1211,7 +1211,7 @@ class CourseManager
         $result = Database::query($sql);
 
         if (Database::num_rows($result) > 0) {
-            return Database::result($result, 0, 'status') == 1;
+            return 1 == Database::result($result, 0, 'status');
         }
 
         return false;
@@ -1623,7 +1623,7 @@ class CourseManager
                         }
 
                         foreach ($extra_fields as $extra) {
-                            if ($extra['1'] == 'ruc') {
+                            if ('ruc' == $extra['1']) {
                                 continue;
                             }
 
@@ -1670,7 +1670,7 @@ class CourseManager
                             )
                         );
 
-                        $report_info['progress_100'] = $progress == 100 ? Display::label(get_lang('Yes'), 'success') : Display::label(get_lang('No'));
+                        $report_info['progress_100'] = 100 == $progress ? Display::label(get_lang('Yes'), 'success') : Display::label(get_lang('No'));
                         $report_info['progress'] = $progress."%";
 
                         foreach ($extra_fields as $extra) {
@@ -1875,7 +1875,7 @@ class CourseManager
         $courseId = $courseInfo['real_id'];
         $students = [];
 
-        if ($session_id == 0) {
+        if (0 == $session_id) {
             if (empty($groupId)) {
                 // students directly subscribed to the course
                 $sql = "SELECT *
@@ -1924,7 +1924,7 @@ class CourseManager
                 $sql_query .= " AND s.access_start_date >= '$date_from' AND s.access_end_date <= '$date_to'";
             }
 
-            if ($session_id != 0) {
+            if (0 != $session_id) {
                 $sql_query .= " AND scu.session_id = $session_id";
             }
 
@@ -2073,7 +2073,7 @@ class CourseManager
             }
 
             if (!empty($list)) {
-                if ($orderList === true) {
+                if (true === $orderList) {
                     $html .= '<ul class="user-teacher">';
                     foreach ($list as $teacher) {
                         $html .= '<li>';
@@ -2179,7 +2179,7 @@ class CourseManager
 
         $html = '';
         if (!empty($course_coachs)) {
-            if ($orderList === true) {
+            if (true === $orderList) {
                 $html .= '<ul class="user-coachs">';
                 foreach ($course_coachs as $coachs) {
                     $html .= Display::tag(
@@ -2226,8 +2226,8 @@ class CourseManager
             return [];
         }
 
-        $session_id != 0 ? $session_condition = ' WHERE g.session_id IN(1,'.intval($session_id).')' : $session_condition = ' WHERE g.session_id = 0';
-        if ($in_get_empty_group == 0) {
+        0 != $session_id ? $session_condition = ' WHERE g.session_id IN(1,'.intval($session_id).')' : $session_condition = ' WHERE g.session_id = 0';
+        if (0 == $in_get_empty_group) {
             // get only groups that are not empty
             $sql = "SELECT DISTINCT g.id, g.iid, g.name
                     FROM ".Database::get_course_table(TABLE_GROUP)." AS g
@@ -2308,14 +2308,14 @@ class CourseManager
         $count = 0;
         if (api_is_multiple_url_enabled()) {
             $url_id = 1;
-            if (api_get_current_access_url_id() != -1) {
+            if (-1 != api_get_current_access_url_id()) {
                 $url_id = api_get_current_access_url_id();
             }
             UrlManager::delete_url_rel_course($courseId, $url_id);
             $count = UrlManager::getCountUrlRelCourse($courseId);
         }
 
-        if ($count === 0) {
+        if (0 === $count) {
             self::create_database_dump($code);
 
             // Cleaning group categories
@@ -2338,7 +2338,7 @@ class CourseManager
             // Cleaning c_x tables
             if (!empty($courseId)) {
                 foreach ($course_tables as $table) {
-                    if ($table === 'document') {
+                    if ('document' === $table) {
                         // Table document will be deleted by Doctrine.
                         continue;
                     }
@@ -2496,7 +2496,7 @@ class CourseManager
         if (is_dir(api_get_path(SYS_COURSE_PATH).$course['directory'])) {
             $file_name = api_get_path(SYS_COURSE_PATH).$course['directory'].'/mysql_dump.sql';
             $handle = fopen($file_name, 'a+');
-            if ($handle !== false) {
+            if (false !== $handle) {
                 fwrite($handle, $sql_dump);
                 fclose($handle);
             } else {
@@ -2532,7 +2532,7 @@ class CourseManager
             0,
             0
         );
-        if ($course_title === false) {
+        if (false === $course_title) {
             $course_title = '';
         }
 
@@ -2551,13 +2551,13 @@ class CourseManager
 
         if (Database::num_rows($result) > 0) {
             while ($courses = Database::fetch_array($result)) {
-                if ($course_title_precedent == '') {
+                if ('' == $course_title_precedent) {
                     $course_title_precedent = $courses['title'];
                 }
                 if (api_strcasecmp($course_title_precedent, $course_title) < 0) {
                     $course_found = true;
                     $course_sort = $courses['sort'];
-                    if ($counter == 0) {
+                    if (0 == $counter) {
                         $sql = "UPDATE $TABLECOURSUSER
                                 SET sort = sort+1
                                 WHERE
@@ -2710,7 +2710,7 @@ class CourseManager
         $join_access_url = $where_access_url = '';
         if (api_get_multiple_access_url()) {
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $tbl_url_course = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
                 $join_access_url = "LEFT JOIN $tbl_url_course url_rel_course
                                     ON url_rel_course.c_id = tcfv.item_id ";
@@ -2771,7 +2771,7 @@ class CourseManager
         $whereAccessUrl = '';
         if (api_get_multiple_access_url()) {
             $accessUrlId = api_get_current_access_url_id();
-            if ($accessUrlId != -1) {
+            if (-1 != $accessUrlId) {
                 $tblUrlCourse = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
                 $joinAccessUrl = "LEFT JOIN $tblUrlCourse url_rel_course
                                   ON url_rel_course.c_id = c.id ";
@@ -2929,7 +2929,7 @@ class CourseManager
             }
         }
 
-        if ($include_sessions === true) {
+        if (true === $include_sessions) {
             $sql = "SELECT DISTINCT (c.code),
                         c.id as real_id,
                         c.category_code AS category,
@@ -2974,10 +2974,10 @@ class CourseManager
         $path = Database::escape_string(str_replace('.', '', str_replace('/', '', $path)));
         $res = Database::query("SELECT code FROM ".Database::get_main_table(TABLE_MAIN_COURSE)."
                 WHERE directory LIKE BINARY '$path'");
-        if ($res === false) {
+        if (false === $res) {
             return false;
         }
-        if (Database::num_rows($res) != 1) {
+        if (1 != Database::num_rows($res)) {
             return false;
         }
         $row = Database::fetch_array($res);
@@ -3053,7 +3053,7 @@ class CourseManager
         $sql = "UPDATE $table SET ";
         $i = 0;
         foreach ($attributes as $name => $value) {
-            if ($value != '') {
+            if ('' != $value) {
                 if ($i > 0) {
                     $sql .= ", ";
                 }
@@ -3366,7 +3366,7 @@ class CourseManager
         $extraInnerJoin = null;
 
         if (!empty($sessionId)) {
-            if ($status == COURSEMANAGER) {
+            if (COURSEMANAGER == $status) {
                 // Teacher of course or teacher inside session
                 $whereConditions = " AND (cru.status = ".COURSEMANAGER." OR srcru.status = 2) ";
             }
@@ -3438,7 +3438,7 @@ class CourseManager
         );
 
         if (!empty($result)) {
-            if ($result['value'] == 1) {
+            if (1 == $result['value']) {
                 return true;
             }
         }
@@ -3501,7 +3501,7 @@ class CourseManager
             while ($course = Database::fetch_array($rs_special_course)) {
                 $course_info = api_get_course_info($course['code']);
                 $courseId = $course_info['real_id'];
-                if ($course_info['visibility'] == COURSE_VISIBILITY_HIDDEN) {
+                if (COURSE_VISIBILITY_HIDDEN == $course_info['visibility']) {
                     continue;
                 }
 
@@ -3531,7 +3531,7 @@ class CourseManager
                         $params['document'] .= Display::div('', ['id' => 'document_result_'.$courseId.'_0', 'class' => 'document_preview_container']);
                     }
                 } else {
-                    if ($course_info['visibility'] != COURSE_VISIBILITY_CLOSED && $load_dirs) {
+                    if (COURSE_VISIBILITY_CLOSED != $course_info['visibility'] && $load_dirs) {
                         $params['document'] = '<a id="document_preview_'.$courseId.'_0" class="document_preview btn btn-outline-secondary btn-sm" href="javascript:void(0);">'
                            .Display::returnFontAwesomeIcon('folder-open').'</a>';
                         $params['document'] .= Display::div('', ['id' => 'document_result_'.$courseId.'_0', 'class' => 'document_preview_container']);
@@ -3550,26 +3550,26 @@ class CourseManager
                     null
                 );
 
-                if (api_get_setting('display_coursecode_in_courselist') == 'true') {
+                if ('true' == api_get_setting('display_coursecode_in_courselist')) {
                     $params['code_course'] = '('.$course_info['visual_code'].')';
                 }
 
                 $params['title'] = $course_info['title'];
                 $params['title_cut'] = $course_info['title'];
                 $params['link'] = $course_info['course_public_url'].'?id_session=0&autoreg=1';
-                if (api_get_setting('display_teacher_in_courselist') === 'true') {
+                if ('true' === api_get_setting('display_teacher_in_courselist')) {
                     $params['teachers'] = self::getTeachersFromCourse(
                         $courseId,
                         true
                     );
                 }
 
-                if ($showCustomIcon === 'true') {
+                if ('true' === $showCustomIcon) {
                     $params['thumbnails'] = $course_info['course_image'];
                     $params['image'] = $course_info['course_image_large'];
                 }
 
-                if ($course_info['visibility'] != COURSE_VISIBILITY_CLOSED) {
+                if (COURSE_VISIBILITY_CLOSED != $course_info['visibility']) {
                     $params['notifications'] = $show_notification;
                 }
 
@@ -3630,7 +3630,7 @@ class CourseManager
                 $url = api_get_path(WEB_CODE_PATH).
                     'auth/sort_my_courses.php?categoryid='.$row['id'].'&sec_token='.$stok.'&redirect=home';
                 $collapsed = isset($row['collapsed']) && $row['collapsed'] ? 1 : 0;
-                if ($collapsed === 0) {
+                if (0 === $collapsed) {
                     $collapsableLink = Display::url(
                         '<i class="fa fa-folder-open"></i>',
                         $url.'&action=set_collapsable&option=1'
@@ -3734,7 +3734,7 @@ class CourseManager
                 ";
         // If multiple URL access mode is enabled, only fetch courses
         // corresponding to the current URL.
-        if (api_get_multiple_access_url() && $current_url_id != -1) {
+        if (api_get_multiple_access_url() && -1 != $current_url_id) {
             $sql .= " AND access_url_id = $current_url_id";
         }
         // Use user's classification for courses (if any).
@@ -3752,7 +3752,7 @@ class CourseManager
             }
 
             if (isset($course_info['visibility']) &&
-                $course_info['visibility'] == COURSE_VISIBILITY_HIDDEN
+                COURSE_VISIBILITY_HIDDEN == $course_info['visibility']
             ) {
                 continue;
             }
@@ -3775,14 +3775,14 @@ class CourseManager
             $params['course_code'] = $row['course_code'];
             $params['code'] = $row['course_code'];
 
-            if ($showCustomIcon === 'true' && $iconName != 'course.png') {
+            if ('true' === $showCustomIcon && 'course.png' != $iconName) {
                 $params['thumbnails'] = $course_info['course_image'];
                 $params['image'] = $course_info['course_image_large'];
             }
 
             $thumbnails = null;
             $image = null;
-            if ($showCustomIcon === 'true' && $iconName != 'course.png') {
+            if ('true' === $showCustomIcon && 'course.png' != $iconName) {
                 $thumbnails = $course_info['course_image'];
                 $image = $course_info['course_image_large'];
             } else {
@@ -3827,7 +3827,7 @@ class CourseManager
 
             $courseUrl = $course_info['course_public_url'].'?id_session=0';
             $teachers = [];
-            if (api_get_setting('display_teacher_in_courselist') === 'true') {
+            if ('true' === api_get_setting('display_teacher_in_courselist')) {
                 $teachers = self::getTeachersFromCourse(
                     $course_info['real_id'],
                     true
@@ -3835,7 +3835,7 @@ class CourseManager
             }
 
             $params['status'] = $row['status'];
-            if (api_get_setting('display_coursecode_in_courselist') === 'true') {
+            if ('true' === api_get_setting('display_coursecode_in_courselist')) {
                 $params['code_course'] = '('.$course_info['visual_code'].') ';
             }
 
@@ -3859,7 +3859,7 @@ class CourseManager
             $params['teachers'] = $teachers;
             $params['real_id'] = $course_info['real_id'];
 
-            if ($course_info['visibility'] != COURSE_VISIBILITY_CLOSED) {
+            if (COURSE_VISIBILITY_CLOSED != $course_info['visibility']) {
                 $params['notifications'] = $showNotification;
             }
             $courseAdded[] = $course_info['real_id'];
@@ -3990,7 +3990,7 @@ class CourseManager
         $course_info = api_get_course_info_by_id($course['real_id']);
         $course_visibility = (int) $course_info['visibility'];
 
-        if ($course_visibility === COURSE_VISIBILITY_HIDDEN) {
+        if (COURSE_VISIBILITY_HIDDEN === $course_visibility) {
             return '';
         }
 
@@ -4021,15 +4021,15 @@ class CourseManager
         // Display the "what's new" icons
         $notifications = '';
         if (
-            ($course_visibility != COURSE_VISIBILITY_CLOSED && $course_visibility != COURSE_VISIBILITY_HIDDEN) ||
+            (COURSE_VISIBILITY_CLOSED != $course_visibility && COURSE_VISIBILITY_HIDDEN != $course_visibility) ||
             !api_get_configuration_value('hide_course_notification')
         ) {
             $notifications .= Display::show_notification($course_info);
         }
 
         if ($session_accessible) {
-            if ($course_visibility != COURSE_VISIBILITY_CLOSED ||
-                $userInCourseStatus == COURSEMANAGER
+            if (COURSE_VISIBILITY_CLOSED != $course_visibility ||
+                COURSEMANAGER == $userInCourseStatus
             ) {
                 if (empty($course_info['id_session'])) {
                     $course_info['id_session'] = 0;
@@ -4045,7 +4045,7 @@ class CourseManager
                     $sessionCourseAvailable = true;
                 }
 
-                if ($userInCourseStatus === COURSEMANAGER || $sessionCourseAvailable) {
+                if (COURSEMANAGER === $userInCourseStatus || $sessionCourseAvailable) {
                     $session_url = $course_info['course_public_url'].'?id_session='.$course_info['id_session'];
                     $session_title = '<a title="'.$course_info['name'].'" href="'.$session_url.'">'.
                         $course_info['name'].'</a>'.$notifications;
@@ -4066,7 +4066,7 @@ class CourseManager
         $showCustomIcon = api_get_setting('course_images_in_courses_list');
         $iconName = basename($course_info['course_image']);
 
-        if ($showCustomIcon === 'true' && $iconName != 'course.png') {
+        if ('true' === $showCustomIcon && 'course.png' != $iconName) {
             $thumbnails = $course_info['course_image'];
             $image = $course_info['course_image_large'];
         } else {
@@ -4094,8 +4094,8 @@ class CourseManager
         $params['document'] = '';
         $params['category'] = $course_info['categoryName'];
 
-        if ($course_visibility != COURSE_VISIBILITY_CLOSED &&
-            $course_visibility != COURSE_VISIBILITY_HIDDEN
+        if (COURSE_VISIBILITY_CLOSED != $course_visibility &&
+            COURSE_VISIBILITY_HIDDEN != $course_visibility
         ) {
             if (api_is_platform_admin()) {
                 $params['edit_actions'] .= api_get_path(WEB_CODE_PATH).'course_info/infocours.php?cidReq='.$course_info['code'];
@@ -4112,7 +4112,7 @@ class CourseManager
                 }
             }
         }
-        if (api_get_setting('display_teacher_in_courselist') === 'true') {
+        if ('true' === api_get_setting('display_teacher_in_courselist')) {
             $teacher_list = self::getTeachersFromCourse(
                 $course_info['real_id'],
                 true
@@ -4123,8 +4123,8 @@ class CourseManager
             );
             $params['teachers'] = $teacher_list;
 
-            if (($course_info['status'] == STUDENT && !empty($course_info['id_session'])) ||
-                ($is_coach && $course_info['status'] != COURSEMANAGER)
+            if ((STUDENT == $course_info['status'] && !empty($course_info['id_session'])) ||
+                ($is_coach && COURSEMANAGER != $course_info['status'])
             ) {
                 $params['coaches'] = $course_coachs;
             }
@@ -4132,7 +4132,7 @@ class CourseManager
         $special = isset($course['special_course']) ? true : false;
         $params['title'] = $session_title;
         $params['special'] = $special;
-        if (api_get_setting('display_coursecode_in_courselist') === 'true') {
+        if ('true' === api_get_setting('display_coursecode_in_courselist')) {
             $params['visual_code'] = '('.$course_info['visual_code'].')';
         }
         $params['extra'] = '';
@@ -4153,11 +4153,11 @@ class CourseManager
                 $session_category_id = self::get_session_category_id_by_session_id($course_info['id_session']);
 
                 if (
-                    $session['access_start_date'] === '0000-00-00 00:00:00' || empty($session['access_start_date']) ||
-                    $session['access_start_date'] === '0000-00-00'
+                    '0000-00-00 00:00:00' === $session['access_start_date'] || empty($session['access_start_date']) ||
+                    '0000-00-00' === $session['access_start_date']
                 ) {
                     $session['dates'] = '';
-                    if (api_get_setting('show_session_coach') === 'true') {
+                    if ('true' === api_get_setting('show_session_coach')) {
                         $session['coach'] = get_lang('General coach').': '.$sessionCoachName;
                     }
                     $active = true;
@@ -4165,7 +4165,7 @@ class CourseManager
                     $session['dates'] = ' - '.
                         get_lang('From').' '.$session['access_start_date'].' '.
                         get_lang('To').' '.$session['access_end_date'];
-                    if (api_get_setting('show_session_coach') === 'true') {
+                    if ('true' === api_get_setting('show_session_coach')) {
                         $session['coach'] = get_lang('General coach').': '.$sessionCoachName;
                     }
                     $date_start = $session['access_start_date'];
@@ -4346,7 +4346,7 @@ class CourseManager
         // Course legal
         $enabled = api_get_plugin_setting('courselegal', 'tool_enable');
 
-        if ($enabled == 'true') {
+        if ('true' == $enabled) {
             require_once api_get_path(SYS_PLUGIN_PATH).'courselegal/config.php';
             $plugin = CourseLegalPlugin::create();
 
@@ -4360,7 +4360,7 @@ class CourseManager
             $result = Database::query($sql);
             if (Database::num_rows($result) > 0) {
                 $result = Database::fetch_array($result);
-                if ($result['legal_agreement'] == 1) {
+                if (1 == $result['legal_agreement']) {
                     return true;
                 }
             }
@@ -4373,7 +4373,7 @@ class CourseManager
             $result = Database::query($sql);
             if (Database::num_rows($result) > 0) {
                 $result = Database::fetch_array($result);
-                if ($result['legal_agreement'] == 1) {
+                if (1 == $result['legal_agreement']) {
                     return true;
                 }
             }
@@ -4395,7 +4395,7 @@ class CourseManager
     {
         // Course plugin legal
         $enabled = api_get_plugin_setting('courselegal', 'tool_enable');
-        if ($enabled == 'true') {
+        if ('true' == $enabled) {
             require_once api_get_path(SYS_PLUGIN_PATH).'courselegal/config.php';
             $plugin = CourseLegalPlugin::create();
 
@@ -4821,7 +4821,7 @@ class CourseManager
             }
 
             if ($access_link && in_array('enter', $access_link) ||
-                $course_info['visibility'] == COURSE_VISIBILITY_OPEN_WORLD
+                COURSE_VISIBILITY_OPEN_WORLD == $course_info['visibility']
             ) {
                 $my_course['go_to_course_button'] = Display::url(
                     get_lang('Go to the course').' '.
@@ -4874,7 +4874,7 @@ class CourseManager
             $my_course['teachers'] = self::getTeachersFromCourse($course_info['real_id'], true);
             $point_info = self::get_course_ranking($course_info['real_id'], 0);
             $my_course['rating_html'] = '';
-            if (api_get_configuration_value('hide_course_rating') === false) {
+            if (false === api_get_configuration_value('hide_course_rating')) {
                 $my_course['rating_html'] = Display::return_rating_system(
                     'star_'.$course_info['real_id'],
                     $ajax_url.'&course_id='.$course_info['real_id'],
@@ -4988,7 +4988,7 @@ class CourseManager
     ) {
         $visibilityCondition = '';
         $hidePrivate = api_get_setting('course_catalog_hide_private');
-        if ($hidePrivate === 'true') {
+        if ('true' === $hidePrivate) {
             $visibilityCondition .= " AND $courseTableAlias.visibility <> ".COURSE_VISIBILITY_REGISTERED;
         }
         if ($hideClosed) {
@@ -5043,7 +5043,7 @@ class CourseManager
             $course = api_get_course_info($course['code']);
         }
 
-        if ($course['visibility'] == COURSE_VISIBILITY_HIDDEN) {
+        if (COURSE_VISIBILITY_HIDDEN == $course['visibility']) {
             return [];
         }
 
@@ -5052,10 +5052,10 @@ class CourseManager
         // Register button
         if (!api_is_anonymous($uid) &&
             (
-            ($course['visibility'] == COURSE_VISIBILITY_OPEN_WORLD || $course['visibility'] == COURSE_VISIBILITY_OPEN_PLATFORM)
+            (COURSE_VISIBILITY_OPEN_WORLD == $course['visibility'] || COURSE_VISIBILITY_OPEN_PLATFORM == $course['visibility'])
                 //$course['visibility'] == COURSE_VISIBILITY_REGISTERED && $course['subscribe'] == SUBSCRIBE_ALLOWED
             ) &&
-            $course['subscribe'] == SUBSCRIBE_ALLOWED &&
+            SUBSCRIBE_ALLOWED == $course['subscribe'] &&
             (!in_array($course['real_id'], $user_courses) || empty($user_courses))
         ) {
             $options[] = 'register';
@@ -5063,24 +5063,24 @@ class CourseManager
 
         // Go To Course button (only if admin, if course public or if student already subscribed)
         if ($is_admin ||
-            $course['visibility'] == COURSE_VISIBILITY_OPEN_WORLD && empty($course['registration_code']) ||
-            (api_user_is_login($uid) && $course['visibility'] == COURSE_VISIBILITY_OPEN_PLATFORM && empty($course['registration_code'])) ||
-            (in_array($course['real_id'], $user_courses) && $course['visibility'] != COURSE_VISIBILITY_CLOSED)
+            COURSE_VISIBILITY_OPEN_WORLD == $course['visibility'] && empty($course['registration_code']) ||
+            (api_user_is_login($uid) && COURSE_VISIBILITY_OPEN_PLATFORM == $course['visibility'] && empty($course['registration_code'])) ||
+            (in_array($course['real_id'], $user_courses) && COURSE_VISIBILITY_CLOSED != $course['visibility'])
         ) {
             $options[] = 'enter';
         }
 
         if ($is_admin ||
-            $course['visibility'] == COURSE_VISIBILITY_OPEN_WORLD && empty($course['registration_code']) ||
-            (api_user_is_login($uid) && $course['visibility'] == COURSE_VISIBILITY_OPEN_PLATFORM && empty($course['registration_code'])) ||
-            (in_array($course['real_id'], $user_courses) && $course['visibility'] != COURSE_VISIBILITY_CLOSED)
+            COURSE_VISIBILITY_OPEN_WORLD == $course['visibility'] && empty($course['registration_code']) ||
+            (api_user_is_login($uid) && COURSE_VISIBILITY_OPEN_PLATFORM == $course['visibility'] && empty($course['registration_code'])) ||
+            (in_array($course['real_id'], $user_courses) && COURSE_VISIBILITY_CLOSED != $course['visibility'])
         ) {
             $options[] = 'enter';
         }
 
-        if ($course['visibility'] != COURSE_VISIBILITY_HIDDEN &&
+        if (COURSE_VISIBILITY_HIDDEN != $course['visibility'] &&
             empty($course['registration_code']) &&
-            $course['unsubscribe'] == UNSUBSCRIBE_ALLOWED &&
+            UNSUBSCRIBE_ALLOWED == $course['unsubscribe'] &&
             api_user_is_login($uid) &&
             in_array($course['real_id'], $user_courses)
         ) {
@@ -5304,7 +5304,7 @@ class CourseManager
         }
 
         $allowLPReturnLink = api_get_setting('allow_lp_return_link');
-        if ($allowLPReturnLink === 'true') {
+        if ('true' === $allowLPReturnLink) {
             $courseSettings[] = 'lp_return_link';
         }
 
@@ -5623,7 +5623,7 @@ class CourseManager
     public static function getCourseGroups()
     {
         $sessionId = api_get_session_id();
-        if ($sessionId != 0) {
+        if (0 != $sessionId) {
             $groupList = self::get_group_list_of_course(
                 api_get_course_id(),
                 $sessionId,
@@ -5893,7 +5893,7 @@ class CourseManager
             $courseAccessUrlTable = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
             $accessUrlId = api_get_current_access_url_id();
 
-            if ($accessUrlId != -1) {
+            if (-1 != $accessUrlId) {
                 $sql = "SELECT DISTINCT(c.id), c.title
                         FROM $courseTable c
                         INNER JOIN $courseUserTable cru ON c.id = cru.c_id
@@ -6030,7 +6030,7 @@ class CourseManager
 
         // If multiple URL access mode is enabled, only fetch courses
         // corresponding to the current URL.
-        if (api_get_multiple_access_url() && $current_url_id != -1) {
+        if (api_get_multiple_access_url() && -1 != $current_url_id) {
             $sql .= " AND url.c_id = course.id AND access_url_id = $current_url_id";
         }
         // Use user's classification for courses (if any).
@@ -6085,7 +6085,7 @@ class CourseManager
                     Display::returnFontAwesomeIcon('pencil').'</a>';
             }
         } else {
-            if ($course_info['visibility'] != COURSE_VISIBILITY_CLOSED) {
+            if (COURSE_VISIBILITY_CLOSED != $course_info['visibility']) {
                 if ($loadDirs) {
                     $params['right_actions'] .= '<a id="document_preview_'.$course_info['real_id'].'_0" class="document_preview" href="javascript:void(0);">'.
                         Display::return_icon('folder.png', get_lang('Documents'), ['align' => 'absmiddle'], ICON_SIZE_SMALL).'</a>';
@@ -6097,7 +6097,7 @@ class CourseManager
                         ]
                     );
                 } else {
-                    if ($course_info['status'] == COURSEMANAGER) {
+                    if (COURSEMANAGER == $course_info['status']) {
                         $params['right_actions'] .= '<a class="btn btn-default btn-sm" title="'.get_lang('Edit').'" href="'.api_get_path(WEB_CODE_PATH).'course_info/infocours.php?cidReq='.$course['code'].'">'.
                             Display::returnFontAwesomeIcon('pencil').'</a>';
                     }
@@ -6106,7 +6106,7 @@ class CourseManager
         }
 
         $course_title_url = '';
-        if ($course_info['visibility'] != COURSE_VISIBILITY_CLOSED || $course['status'] == COURSEMANAGER) {
+        if (COURSE_VISIBILITY_CLOSED != $course_info['visibility'] || COURSEMANAGER == $course['status']) {
             $course_title_url = api_get_path(WEB_COURSE_PATH).$course_info['path'].'/?id_session=0';
             $course_title = Display::url($course_info['title'], $course_title_url);
         } else {
@@ -6118,11 +6118,11 @@ class CourseManager
         }
 
         // Start displaying the course block itself
-        if (api_get_setting('display_coursecode_in_courselist') === 'true') {
+        if ('true' === api_get_setting('display_coursecode_in_courselist')) {
             $course_title .= ' ('.$course_info['visual_code'].') ';
         }
         $teachers = '';
-        if (api_get_setting('display_teacher_in_courselist') === 'true') {
+        if ('true' === api_get_setting('display_teacher_in_courselist')) {
             $teachers = self::getTeacherListFromCourseCodeToString(
                 $course['code'],
                 self::USER_SEPARATOR,
@@ -6133,7 +6133,7 @@ class CourseManager
         $params['icon'] = $status_icon;
         $params['title'] = $course_title;
         $params['teachers'] = $teachers;
-        if ($course_info['visibility'] != COURSE_VISIBILITY_CLOSED) {
+        if (COURSE_VISIBILITY_CLOSED != $course_info['visibility']) {
             $params['notifications'] = $show_notification;
         }
 
@@ -6172,12 +6172,12 @@ class CourseManager
      */
     public static function createDefaultGradebook($modelId, $courseCode)
     {
-        if (api_get_setting('gradebook_enable_grade_model') === 'true') {
+        if ('true' === api_get_setting('gradebook_enable_grade_model')) {
             //Create gradebook_category for the new course and add
             // a gradebook model for the course
             if (isset($modelId) &&
                 !empty($modelId) &&
-                $modelId != '-1'
+                '-1' != $modelId
             ) {
                 GradebookUtils::create_default_course_gradebook(
                     $courseCode,
@@ -6197,7 +6197,7 @@ class CourseManager
     public static function useTemplateAsBasisIfRequired($courseCode, $courseTemplate)
     {
         $template = api_get_setting('course_creation_use_template');
-        $teacherCanSelectCourseTemplate = api_get_setting('teacher_can_select_course_template') === 'true';
+        $teacherCanSelectCourseTemplate = 'true' === api_get_setting('teacher_can_select_course_template');
         $courseTemplate = isset($courseTemplate) ? intval($courseTemplate) : 0;
 
         $useTemplate = false;
@@ -6244,7 +6244,7 @@ class CourseManager
         }
 
         $registered_users_with_extra_field = 0;
-        if (!empty($name) && $name != '-') {
+        if (!empty($name) && '-' != $name) {
             $extraFieldType = EntityExtraField::COURSE_FIELD_TYPE;
             $name = Database::escape_string($name);
             $sql = "SELECT count(v.item_id) as count
@@ -6290,7 +6290,7 @@ class CourseManager
             return '';
         }
 
-        if (api_get_setting('show_courses_descriptions_in_catalog') == 'true') {
+        if ('true' == api_get_setting('show_courses_descriptions_in_catalog')) {
             $title = $course['title'];
             $url = api_get_path(WEB_CODE_PATH).'inc/ajax/course_home.ajax.php?a=show_course_information&code='.$course['code'];
             $html = Display::url(
diff --git a/public/main/inc/lib/course_category.lib.php b/public/main/inc/lib/course_category.lib.php
index f3fea1e446..f4bdf76ffd 100644
--- a/public/main/inc/lib/course_category.lib.php
+++ b/public/main/inc/lib/course_category.lib.php
@@ -226,7 +226,7 @@ class CourseCategory
         // First get to the highest level possible in the tree
         $result = Database::query("SELECT parent_id FROM $table WHERE id = '$categoryId'");
         $row = Database::fetch_array($result);
-        if ($row !== false && $row['parent_id'] != 0) {
+        if (false !== $row && 0 != $row['parent_id']) {
             // if a parent was found, enter there to see if he's got one more parent
             self::updateParentCategoryChildrenCount($row['parent_id'], $delta);
         }
@@ -625,9 +625,9 @@ class CourseCategory
 
         $categoryJoin = '';
         $categoryFilter = '';
-        if ($categoryCode === 'ALL') {
+        if ('ALL' === $categoryCode) {
             // Nothing to do
-        } elseif ($categoryCode === 'NONE') {
+        } elseif ('NONE' === $categoryCode) {
             $categoryFilter = ' AND course.category_id IS NULL ';
         } else {
             $categoryJoin = " INNER JOIN $tblCourseCategory cat ON course.category_id = cat.id ";
@@ -808,7 +808,7 @@ class CourseCategory
         $action = isset($action) ? Security::remove_XSS($action) : $requestAction;
         $searchTerm = isset($_REQUEST['search_term']) ? Security::remove_XSS($_REQUEST['search_term']) : null;
 
-        if ($action === 'subscribe_user_with_password') {
+        if ('subscribe_user_with_password' === $action) {
             $action = 'subscribe';
         }
 
@@ -865,7 +865,7 @@ class CourseCategory
 
         // If is current page ('active' class) clear URL
         if (isset($liAttributes) && is_array($liAttributes) && isset($liAttributes['class'])) {
-            if (strpos('active', $liAttributes['class']) !== false) {
+            if (false !== strpos('active', $liAttributes['class'])) {
                 $url = '';
             }
         }
diff --git a/public/main/inc/lib/course_description.lib.php b/public/main/inc/lib/course_description.lib.php
index 67f08eff0b..165fa2da7a 100644
--- a/public/main/inc/lib/course_description.lib.php
+++ b/public/main/inc/lib/course_description.lib.php
@@ -7,14 +7,10 @@
  * course_description_controller (MVC pattern).
  *
  * @author Christian Fasanando <christian1827@gmail.com>
- *
- * @package chamilo.course_description
  */
 
 /**
  * Class CourseDescription course descriptions.
- *
- * @package chamilo.course_description
  */
 class CourseDescription
 {
diff --git a/public/main/inc/lib/course_home.lib.php b/public/main/inc/lib/course_home.lib.php
index d8d4100261..8256742885 100644
--- a/public/main/inc/lib/course_home.lib.php
+++ b/public/main/inc/lib/course_home.lib.php
@@ -137,7 +137,7 @@ class CourseHome
         $session_id = api_get_session_id();
         $is_platform_admin = api_is_platform_admin();
         $allowEditionInSession = api_get_configuration_value('allow_edit_tool_visibility_in_session');
-        if ($session_id == 0) {
+        if (0 == $session_id) {
             $is_allowed_to_edit = api_is_allowed_to_edit(null, true) && api_is_course_admin();
         } else {
             $is_allowed_to_edit = api_is_allowed_to_edit(null, true) && !api_is_coach();
@@ -155,7 +155,7 @@ class CourseHome
             $toolModel = $toolChain->getToolFromName($tool->getTool()->getName());
             if ($is_allowed_to_edit) {
                 if (empty($session_id)) {
-                    if ($tool->getVisibility() == '1' && $toolAdmin != '1') {
+                    if ('1' == $tool->getVisibility() && '1' != $toolAdmin) {
                         $link['name'] = Display::return_icon(
                             'visible.png',
                             get_lang('Deactivate'),
@@ -164,7 +164,7 @@ class CourseHome
                             false
                         );
                     }
-                    if ($tool->getVisibility() == '0' && $toolAdmin != '1') {
+                    if ('0' == $tool->getVisibility() && '1' != $toolAdmin) {
                         $link['name'] = Display::return_icon(
                             'invisible.png',
                             get_lang('Activate'),
@@ -207,7 +207,7 @@ class CourseHome
 
             // Both checks are necessary as is_platform_admin doesn't take student view into account
             if ($is_platform_admin && $is_allowed_to_edit) {
-                if ($toolAdmin != '1') {
+                if ('1' != $toolAdmin) {
                     $link['cmd'] = 'hide=yes';
                 }
             }
@@ -215,7 +215,7 @@ class CourseHome
             $item['visibility'] = '';
 
             $class = '';
-            if ($tool->getVisibility() == '0' && $toolAdmin != '1') {
+            if ('0' == $tool->getVisibility() && '1' != $toolAdmin) {
                 $class = 'text-muted';
                 $info = pathinfo($tool['image']);
                 $basename = basename($tool['image'], '.'.$info['extension']);
@@ -416,8 +416,8 @@ class CourseHome
         $html = '<div id="toolnav">';
         $html .= '<ul id="toolnavbox">';
 
-        $showOnlyText = api_get_setting('show_navigation_menu') === 'text';
-        $showOnlyIcons = api_get_setting('show_navigation_menu') === 'icons';
+        $showOnlyText = 'text' === api_get_setting('show_navigation_menu');
+        $showOnlyIcons = 'icons' === api_get_setting('show_navigation_menu');
 
         foreach ($blocks as $block) {
             $blockItems = $block['content'];
@@ -476,7 +476,7 @@ class CourseHome
     {
         $origin = api_get_origin();
         $courseInfo = api_get_course_info();
-        if ($origin === 'learnpath') {
+        if ('learnpath' === $origin) {
             return '';
         }
 
@@ -484,7 +484,7 @@ class CourseHome
         $html = '';
         if (!empty($blocks)) {
             $styleId = 'toolshortcuts_vertical';
-            if ($orientation == SHORTCUTS_HORIZONTAL) {
+            if (SHORTCUTS_HORIZONTAL == $orientation) {
                 $styleId = 'toolshortcuts_horizontal';
             }
             $html .= '<div id="'.$styleId.'">';
@@ -505,7 +505,7 @@ class CourseHome
                         $item['only_href'],
                         $item['url_params']
                     );
-                    if ($orientation == SHORTCUTS_VERTICAL) {
+                    if (SHORTCUTS_VERTICAL == $orientation) {
                         $html .= '<br />';
                     }
                 }
@@ -626,7 +626,7 @@ class CourseHome
             'description' => $values['description'],
         ];
 
-        if (isset($_FILES['icon']['size']) && $_FILES['icon']['size'] !== 0) {
+        if (isset($_FILES['icon']['size']) && 0 !== $_FILES['icon']['size']) {
             $dir = self::getCustomSysIconPath();
 
             // Resize image if it is larger than 64px
@@ -653,7 +653,7 @@ class CourseHome
             $ext = pathinfo($path, PATHINFO_EXTENSION);
             $bwPath = substr($path, 0, -(strlen($ext) + 1)).'_na.'.$ext;
 
-            if ($r === false) {
+            if (false === $r) {
                 error_log('Conversion to B&W of '.$path.' failed in '.__FILE__.' at line '.__LINE__);
             } else {
                 $temp->send_image($bwPath);
@@ -747,13 +747,13 @@ class CourseHome
         ];
 
         $sessionsCopy = api_get_setting('allow_session_course_copy_for_teachers');
-        if ($sessionsCopy === 'true') {
+        if ('true' === $sessionsCopy) {
             // Adding only maintenance for coaches.
             $myList = self::get_tools_category(TOOL_ADMIN_PLATFORM);
             $onlyMaintenanceList = [];
 
             foreach ($myList as $item) {
-                if ($item['name'] === 'course_maintenance') {
+                if ('course_maintenance' === $item['name']) {
                     $item['link'] = 'course_info/maintenance_coach.php';
 
                     $onlyMaintenanceList[] = $item;
@@ -785,7 +785,7 @@ class CourseHome
         if ($isDrhOfCourse) {
             $addUserTool = true;
             foreach ($tools as $tool) {
-                if ($tool['name'] === 'user') {
+                if ('user' === $tool['name']) {
                     $addUserTool = false;
                     break;
                 }
@@ -827,7 +827,7 @@ class CourseHome
     {
         $sessionId = api_get_session_id();
         // Start of tools for CourseAdmins (teachers/tutors)
-        if ($sessionId === 0 && api_is_course_admin() && api_is_allowed_to_edit(null, true)) {
+        if (0 === $sessionId && api_is_course_admin() && api_is_allowed_to_edit(null, true)) {
             $blocks = self::getCourseAdminBlocks($toolChain);
         } elseif (api_is_coach()) {
             $blocks = self::getCoachBlocks($toolChain);
@@ -851,7 +851,7 @@ class CourseHome
     {
         $patronKey = ':teacher';
 
-        if ($courseToolCategory == TOOL_STUDENT_VIEW) {
+        if (TOOL_STUDENT_VIEW == $courseToolCategory) {
             //Fix only coach can see external pages - see #8236 - icpna
             if (api_is_coach()) {
                 foreach ($dataIcons as $index => $array) {
@@ -872,7 +872,7 @@ class CourseHome
 
                 $pos = strpos($array['name'], $patronKey);
 
-                if ($pos !== false) {
+                if (false !== $pos) {
                     unset($dataIcons[$index]);
                     $flagOrder = true;
                 }
diff --git a/public/main/inc/lib/course_request.lib.php b/public/main/inc/lib/course_request.lib.php
index 534f26f4eb..33d409fdaf 100644
--- a/public/main/inc/lib/course_request.lib.php
+++ b/public/main/inc/lib/course_request.lib.php
@@ -4,14 +4,10 @@
 /**
  * Course request manager.
  *
- * @package chamilo.library
- *
  * @author José Manuel Abuin Mosquera <chema@cesga.es>, 2010
  * @author Bruno Rubio Gayo <brubio@cesga.es>, 2010
  * Centro de Supercomputacion de Galicia (CESGA)
  * @author Ivan Tcholakov <ivantcholakov@gmail.com> (technical adaptation for Chamilo 1.8.8), 2010
- *
- * @package chamilo.library
  */
 class CourseRequestManager
 {
@@ -72,7 +68,7 @@ class CourseRequestManager
         $user_id = (int) $user_id;
         $exemplary_content = (bool) $exemplary_content ? 1 : 0;
 
-        if ($wanted_code == '') {
+        if ('' == $wanted_code) {
             return false;
         }
 
@@ -274,7 +270,7 @@ class CourseRequestManager
         $user_id = (int) $user_id;
         $exemplary_content = (bool) $exemplary_content ? 1 : 0;
 
-        if ($wanted_code == '') {
+        if ('' == $wanted_code) {
             return false;
         }
 
@@ -367,7 +363,7 @@ class CourseRequestManager
         );
         $result_sql = Database::query($sql);
 
-        return $result_sql !== false;
+        return false !== $result_sql;
     }
 
     /**
@@ -384,7 +380,7 @@ class CourseRequestManager
                 WHERE id = ".$id;
         $result = Database::query($sql);
 
-        return $result !== false;
+        return false !== $result;
     }
 
     /**
@@ -594,7 +590,7 @@ class CourseRequestManager
         $sql = "UPDATE ".Database::get_main_table(TABLE_MAIN_COURSE_REQUEST)."
                 SET status = ".COURSE_REQUEST_REJECTED."
                 WHERE id = ".$id;
-        if (Database::query($sql) === false) {
+        if (false === Database::query($sql)) {
             return false;
         }
 
@@ -731,7 +727,7 @@ class CourseRequestManager
         // Marking the fact that additional information about the request has been asked.
         $sql = "UPDATE ".Database::get_main_table(TABLE_MAIN_COURSE_REQUEST)."
                 SET info = 1 WHERE id = ".$id;
-        $result = Database::query($sql) !== false;
+        $result = false !== Database::query($sql);
 
         return $result;
     }
diff --git a/public/main/inc/lib/custom_pages.class.php b/public/main/inc/lib/custom_pages.class.php
index 8e77688f85..867dc8e2ca 100644
--- a/public/main/inc/lib/custom_pages.class.php
+++ b/public/main/inc/lib/custom_pages.class.php
@@ -24,7 +24,7 @@ class CustomPages
      */
     public static function enabled()
     {
-        return api_get_setting('use_custom_pages') == 'true';
+        return 'true' == api_get_setting('use_custom_pages');
     }
 
     /**
diff --git a/public/main/inc/lib/dashboard.lib.php b/public/main/inc/lib/dashboard.lib.php
index 19ac42400c..f5b8e59d85 100644
--- a/public/main/inc/lib/dashboard.lib.php
+++ b/public/main/inc/lib/dashboard.lib.php
@@ -61,7 +61,7 @@ class DashboardManager
                 }
                 echo '</tr>';
             } else {
-                if ($testplugin != 'css') {
+                if ('css' != $testplugin) {
                     echo Display::tag(
                         'tr',
                         Display::tag(
@@ -81,7 +81,7 @@ class DashboardManager
                 echo '<td><center><input type="checkbox" name="disabled_block" value="true" checked disabled /></center>';
                 for ($j = 0; $j < count($table_cols); $j++) {
                     if (isset($disabled_block[strtolower($table_cols[$j])])) {
-                        if ($j == 2) {
+                        if (2 == $j) {
                             echo '<td>';
                             echo '<font color="#aaa">'.$disabled_block[$table_cols[$j]].'</font><br />';
                             echo '<font color="red">'.get_lang('This plugin has been deleted from the dashboard plugin directory').'</font>';
@@ -262,7 +262,7 @@ class DashboardManager
         $dashboard_pluginpath = api_get_path(SYS_PLUGIN_PATH).'dashboard/';
         $handle = @opendir($dashboard_pluginpath);
         while (false !== ($file = readdir($handle))) {
-            if ($file != '.' && $file != '..' && is_dir($dashboard_pluginpath.$file)) {
+            if ('.' != $file && '..' != $file && is_dir($dashboard_pluginpath.$file)) {
                 $possiblePlugins[] = $file;
             }
         }
@@ -394,8 +394,8 @@ class DashboardManager
                     $html .= '<td>'.$block['description'].'</td>';
                     $html .= '<td>
                             <select class="selectpicker show-tick form-control" name="columns['.$block['id'].']">
-                            <option value="1" '.(isset($user_block_data[$block['id']]) && $user_block_data[$block['id']]['column'] == 1 ? 'selected' : '').' >1</option>
-                            <option value="2" '.(isset($user_block_data[$block['id']]) && $user_block_data[$block['id']]['column'] == 2 ? 'selected' : '').' >2</option>
+                            <option value="1" '.(isset($user_block_data[$block['id']]) && 1 == $user_block_data[$block['id']]['column'] ? 'selected' : '').' >1</option>
+                            <option value="2" '.(isset($user_block_data[$block['id']]) && 2 == $user_block_data[$block['id']]['column'] ? 'selected' : '').' >2</option>
                             </select>
                           </td>';
                     $html .= '</tr>';
diff --git a/public/main/inc/lib/database.constants.inc.php b/public/main/inc/lib/database.constants.inc.php
index 1491e393df..0ce5e0fb56 100644
--- a/public/main/inc/lib/database.constants.inc.php
+++ b/public/main/inc/lib/database.constants.inc.php
@@ -7,8 +7,6 @@
  *
  *  @todo the table constants have all to start with TABLE_
  *  This is because of the analogy with the tool constants TOOL_
- *
- *	@package chamilo.library
  */
 
 //See #3910 defines the default prefix for the single course database
diff --git a/public/main/inc/lib/database.lib.php b/public/main/inc/lib/database.lib.php
index 56df73f7ba..ed60f3a3b4 100644
--- a/public/main/inc/lib/database.lib.php
+++ b/public/main/inc/lib/database.lib.php
@@ -180,7 +180,7 @@ class Database
      */
     public static function fetch_array(Statement $result, $option = 'BOTH')
     {
-        if ($result === false) {
+        if (false === $result) {
             return [];
         }
 
@@ -216,7 +216,7 @@ class Database
      */
     public static function fetch_row(Statement $result)
     {
-        if ($result === false) {
+        if (false === $result) {
             return [];
         }
 
@@ -238,7 +238,7 @@ class Database
      */
     public static function num_rows(Statement $result)
     {
-        if ($result === false) {
+        if (false === $result) {
             return 0;
         }
 
@@ -288,7 +288,7 @@ class Database
      */
     public static function handleError($e)
     {
-        $debug = api_get_setting('server_type') == 'test';
+        $debug = 'test' == api_get_setting('server_type');
         if ($debug) {
             // We use Symfony exception handler for better error information
             $handler = new ExceptionHandler();
@@ -469,7 +469,7 @@ class Database
         if (is_array($columns)) {
             $clean_columns = implode(',', $columns);
         } else {
-            if ($columns == '*') {
+            if ('*' == $columns) {
                 $clean_columns = '*';
             } else {
                 $clean_columns = (string) $columns;
@@ -483,7 +483,7 @@ class Database
         $result = self::query($sql);
         $array = [];
 
-        if ($type_result === 'all') {
+        if ('all' === $type_result) {
             while ($row = self::fetch_array($result, $option)) {
                 if (isset($row['id'])) {
                     $array[$row['id']] = $row;
@@ -515,7 +515,7 @@ class Database
         }
         $return_value = $where_return = '';
         foreach ($conditions as $type_condition => $condition_data) {
-            if ($condition_data == false) {
+            if (false == $condition_data) {
                 continue;
             }
             $type_condition = strtolower($type_condition);
@@ -533,7 +533,7 @@ class Database
                             $clean_values = $value_array;
                         }
 
-                        if (!empty($condition) && $clean_values != '') {
+                        if (!empty($condition) && '' != $clean_values) {
                             $condition = str_replace('%', "'@percentage@'", $condition); //replace "%"
                             $condition = str_replace("'?'", "%s", $condition);
                             $condition = str_replace("?", "%s", $condition);
diff --git a/public/main/inc/lib/diagnoser.lib.php b/public/main/inc/lib/diagnoser.lib.php
index 5e83648f13..78e00c03c5 100644
--- a/public/main/inc/lib/diagnoser.lib.php
+++ b/public/main/inc/lib/diagnoser.lib.php
@@ -5,8 +5,6 @@
  * Class Diagnoser
  * Class that is responsible for generating diagnostic information about the system.
  *
- * @package chamilo.diagnoser
- *
  * @author Ivan Tcholakov, 2008, initial proposal and sample code.
  * @author spou595, 2009, implementation for Chamilo 2.x
  * @author Julio Montoya <gugli100@gmail.com>, 2010, port to chamilo 1.8.7, Some fixes
@@ -74,7 +72,7 @@ class Diagnoser
         $data = call_user_func([$this, 'get_'.$currentSection.'_data']);
         echo $html;
 
-        if ($currentSection != 'paths') {
+        if ('paths' != $currentSection) {
             echo '<br />';
             echo Display::return_message($sections[$currentSection]['info'], 'normal');
 
@@ -190,11 +188,11 @@ class Diagnoser
 
         $access_url_id = api_get_current_access_url_id();
 
-        if ($access_url_id === 1) {
+        if (1 === $access_url_id) {
             $size = '-';
             global $_configuration;
             $message2 = '';
-            if ($access_url_id === 1) {
+            if (1 === $access_url_id) {
                 if (api_is_windows_os()) {
                     $message2 .= get_lang('The space used on disk cannot be measured properly on Windows-based systems.');
                 } else {
@@ -390,7 +388,7 @@ class Diagnoser
         );
 
         $setting = ini_get('default_charset');
-        if ($setting == '') {
+        if ('' == $setting) {
             $setting = null;
         }
         $req_setting = 'UTF-8';
diff --git a/public/main/inc/lib/display.lib.php b/public/main/inc/lib/display.lib.php
index 2a3e8779fe..817c52c4fc 100644
--- a/public/main/inc/lib/display.lib.php
+++ b/public/main/inc/lib/display.lib.php
@@ -79,6 +79,7 @@ class Display
     {
         ob_start();
         self::$legacyTemplate = '@ChamiloTheme/Layout/no_layout.html.twig';
+
         return true;
 
         global $show_learnpath, $tool_name;
@@ -169,7 +170,7 @@ class Display
         $editor_config = null
     ) {
         $moduleId = $tool;
-        if (api_get_setting('enable_tool_introduction') == 'true' || $tool == TOOL_COURSE_HOMEPAGE) {
+        if ('true' == api_get_setting('enable_tool_introduction') || TOOL_COURSE_HOMEPAGE == $tool) {
             $introduction_section = null;
             require api_get_path(SYS_CODE_PATH).'inc/introductionSection.inc.php';
 
@@ -221,7 +222,7 @@ class Display
         if (is_array($query_vars)) {
             $table->set_additional_parameters($query_vars);
         }
-        if ($style == 'table') {
+        if ('table' == $style) {
             if (is_array($header) && count($header) > 0) {
                 foreach ($header as $index => $header_item) {
                     $table->set_header(
@@ -506,12 +507,12 @@ class Display
         }
 
         // "mailto:" already present?
-        if (substr($email, 0, 7) !== 'mailto:') {
+        if ('mailto:' !== substr($email, 0, 7)) {
             $email = 'mailto:'.$email;
         }
 
         // Class (stylesheet) defined?
-        if ($style_class !== '') {
+        if ('' !== $style_class) {
             $style_class = ' class="'.$style_class.'"';
         }
 
@@ -524,7 +525,7 @@ class Display
         $value = api_get_configuration_value('add_user_course_information_in_mailto');
 
         if ($value) {
-            if (api_get_setting('allow_email_editor') === 'false') {
+            if ('false' === api_get_setting('allow_email_editor')) {
                 $hmail .= '?';
             }
 
@@ -585,11 +586,11 @@ class Display
         $style_class = ''
     ) {
         // "mailto:" already present?
-        if (substr($email, 0, 7) != 'mailto:') {
+        if ('mailto:' != substr($email, 0, 7)) {
             $email = 'mailto:'.$email;
         }
         // Class (stylesheet) defined?
-        if ($style_class != '') {
+        if ('' != $style_class) {
             $style_class = ' class="'.$style_class.'"';
         }
         // Encrypt email
@@ -768,7 +769,7 @@ class Display
         // When moving this to production, the return_icon() calls should
         // ask for the SVG version directly
         $svgIcons = api_get_setting('icons_mode_svg');
-        if ($svgIcons == 'true' && $return_only_path == false) {
+        if ('true' == $svgIcons && false == $return_only_path) {
             $svgImage = substr($image, 0, -3).'svg';
             if (is_file($code_path.$theme.'svg/'.$svgImage)) {
                 $icon = $w_code_path.$theme.'svg/'.$svgImage;
@@ -831,7 +832,7 @@ class Display
         }
 
         // alt text = the image name if there is none provided (for XHTML compliance)
-        if ($alt_text == '') {
+        if ('' == $alt_text) {
             $alt_text = basename($image_path);
         }
 
@@ -982,7 +983,7 @@ class Display
         $default_id = 'id="'.$name.'" ';
         $extra_attributes = array_merge(['class' => 'form-control'], $extra_attributes);
         foreach ($extra_attributes as $key => $parameter) {
-            if ($key == 'id') {
+            if ('id' == $key) {
                 $default_id = '';
             }
             $extra .= $key.'="'.$parameter.'" ';
@@ -1055,7 +1056,7 @@ class Display
         $ul_attributes = [],
         $selected = ''
     ) {
-        if (empty($headers) || count($headers) == 0) {
+        if (empty($headers) || 0 == count($headers)) {
             return '';
         }
 
@@ -1063,7 +1064,7 @@ class Display
         $i = 1;
         foreach ($headers as $item) {
             $active = '';
-            if ($i == 1) {
+            if (1 == $i) {
                 $active = ' active';
             }
 
@@ -1105,7 +1106,7 @@ class Display
         $divs = '';
         foreach ($items as $content) {
             $active = '';
-            if ($i == 1) {
+            if (1 == $i) {
                 $active = ' show active';
             }
 
@@ -1368,7 +1369,7 @@ class Display
         if (!empty($extra_params)) {
             foreach ($extra_params as $key => $element) {
                 // the groupHeaders key gets a special treatment
-                if ($key != 'groupHeaders') {
+                if ('groupHeaders' != $key) {
                     $obj->$key = $element;
                 }
             }
@@ -1403,8 +1404,8 @@ class Display
         $json_encode = str_replace(['{"first":"first",', '"end":"end"}'], '', $json_encode);
 
         if (api_get_configuration_value('allow_compilatio_tool') &&
-            (strpos($_SERVER['REQUEST_URI'], 'work/work.php') !== false ||
-             strpos($_SERVER['REQUEST_URI'], 'work/work_list_all.php') != false
+            (false !== strpos($_SERVER['REQUEST_URI'], 'work/work.php') ||
+             false != strpos($_SERVER['REQUEST_URI'], 'work/work_list_all.php')
             )
         ) {
             $json_encode = str_replace('"function () { compilatioInit() }"',
@@ -1572,7 +1573,7 @@ class Display
                 $toolName = Database::escape_string($toolName);
                 // Fix to get student publications
                 $toolCondition = " tool = '$toolName' AND ";
-                if ($toolName == 'student_publication' || $toolName == 'work') {
+                if ('student_publication' == $toolName || 'work' == $toolName) {
                     $toolCondition = " (tool = 'work' OR tool = 'student_publication') AND ";
                 }
 
@@ -1610,15 +1611,15 @@ class Display
         foreach ($notifications as $notification) {
             $toolName = $notification['tool'];
             if (!(
-                    $notification['visibility'] == '1' ||
-                    ($status == '1' && $notification['visibility'] == '0') ||
+                    '1' == $notification['visibility'] ||
+                    ('1' == $status && '0' == $notification['visibility']) ||
                     !isset($notification['visibility'])
                 )
             ) {
                 continue;
             }
 
-            if ($toolName == TOOL_SURVEY) {
+            if (TOOL_SURVEY == $toolName) {
                 $survey_info = SurveyManager::get_survey($notification['ref'], 0, $course_code);
                 if (!empty($survey_info)) {
                     $invited_users = SurveyUtil::get_invited_users(
@@ -1631,30 +1632,30 @@ class Display
                 }
             }
 
-            if ($notification['tool'] == TOOL_LEARNPATH) {
+            if (TOOL_LEARNPATH == $notification['tool']) {
                 if (!learnpath::is_lp_visible_for_student($notification['ref'], $user_id, $courseInfo)) {
                     continue;
                 }
             }
 
-            if ($notification['tool'] == TOOL_DROPBOX) {
+            if (TOOL_DROPBOX == $notification['tool']) {
                 $notification['link'] = 'dropbox/dropbox_download.php?id='.$notification['ref'];
             }
 
-            if ($notification['tool'] == 'work' &&
-                $notification['lastedit_type'] == 'DirectoryCreated'
+            if ('work' == $notification['tool'] &&
+                'DirectoryCreated' == $notification['lastedit_type']
             ) {
                 $notification['lastedit_type'] = 'WorkAdded';
             }
 
             $lastDate = api_get_local_time($notification['lastedit_date']);
             $type = $notification['lastedit_type'];
-            if ($type == 'CalendareventVisible') {
+            if ('CalendareventVisible' == $type) {
                 $type = 'Visible';
             }
             $label = get_lang('Since your latest visit').": ".get_lang($type)." ($lastDate)";
 
-            if (strpos($notification['link'], '?') === false) {
+            if (false === strpos($notification['link'], '?')) {
                 $notification['link'] = $notification['link'].'?notification=1';
             } else {
                 $notification['link'] = $notification['link'].'&notification=1';
@@ -1704,12 +1705,12 @@ class Display
             $session['coach_id'] = $session['id_coach'] = $session_info['id_coach'];
             $session['dates'] = '';
             $session['coach'] = '';
-            if (api_get_setting('show_session_coach') === 'true' && isset($coachInfo['complete_name'])) {
+            if ('true' === api_get_setting('show_session_coach') && isset($coachInfo['complete_name'])) {
                 $session['coach'] = get_lang('General coach').': '.$coachInfo['complete_name'];
             }
 
-            if (($session_info['access_end_date'] == '0000-00-00 00:00:00' &&
-                $session_info['access_start_date'] == '0000-00-00 00:00:00') ||
+            if (('0000-00-00 00:00:00' == $session_info['access_end_date'] &&
+                '0000-00-00 00:00:00' == $session_info['access_start_date']) ||
                 (empty($session_info['access_end_date']) && empty($session_info['access_start_date']))
             ) {
                 if (isset($session_info['duration']) && !empty($session_info['duration'])) {
@@ -1722,7 +1723,7 @@ class Display
             } else {
                 $dates = SessionManager::parseSessionDates($session_info, true);
                 $session['dates'] = $dates['access'];
-                if (api_get_setting('show_session_coach') === 'true' && isset($coachInfo['complete_name'])) {
+                if ('true' === api_get_setting('show_session_coach') && isset($coachInfo['complete_name'])) {
                     $session['coach'] = $coachInfo['complete_name'];
                 }
                 $active = $date_start <= $now && $date_end >= $now;
@@ -1802,8 +1803,8 @@ class Display
         $html .= '</section>';
         $labels = [];
 
-        $labels[] = $number_of_users_who_voted == 1 ? $number_of_users_who_voted.' '.get_lang('Vote') : $number_of_users_who_voted.' '.get_lang('Votes');
-        $labels[] = $accesses == 1 ? $accesses.' '.get_lang('Visit') : $accesses.' '.get_lang('Visits');
+        $labels[] = 1 == $number_of_users_who_voted ? $number_of_users_who_voted.' '.get_lang('Vote') : $number_of_users_who_voted.' '.get_lang('Votes');
+        $labels[] = 1 == $accesses ? $accesses.' '.get_lang('Visit') : $accesses.' '.get_lang('Visits');
         $labels[] = $point_info['user_vote'] ? get_lang('Your vote').' ['.$point_info['user_vote'].']' : get_lang('Your vote').' [?] ';
 
         if (!$add_div_wrapper && api_is_anonymous()) {
@@ -2090,7 +2091,7 @@ class Display
             if (empty($id)) {
                 $id = api_get_unique_id();
             }
-            if ($type == 'jquery') {
+            if ('jquery' == $type) {
                 $html = '<div class="accordion_jquery" id="'.$id.'">'; //using jquery
             } else {
                 $html = '<div class="accordion" id="'.$id.'">'; //using bootstrap
@@ -2295,7 +2296,7 @@ class Display
             switch ($type) {
                 case 'positive':
                     if (in_array($itemId, $array)) {
-                        if ($mode == 'overwrite') {
+                        if ('overwrite' == $mode) {
                             $class = " $defaultClass $class_to_applied";
                         } else {
                             $class .= " $class_to_applied";
@@ -2304,7 +2305,7 @@ class Display
                     break;
                 case 'negative':
                     if (!in_array($itemId, $array)) {
-                        if ($mode == 'overwrite') {
+                        if ('overwrite' == $mode) {
                             $class = " $defaultClass $class_to_applied";
                         } else {
                             $class .= " $class_to_applied";
@@ -2707,7 +2708,7 @@ HTML;
      */
     public static function dateToStringAgoAndLongDate($dateTime)
     {
-        if (empty($dateTime) || $dateTime === '0000-00-00 00:00:00') {
+        if (empty($dateTime) || '0000-00-00 00:00:00' === $dateTime) {
             return '';
         }
 
@@ -2816,7 +2817,7 @@ HTML;
         $videoPluginCSS = [];
         if (!empty($features) && isset($features['features'])) {
             foreach ($features['features'] as $feature) {
-                if ($feature === 'vrview') {
+                if ('vrview' === $feature) {
                     continue;
                 }
                 $defaultFeatures[] = $feature;
diff --git a/public/main/inc/lib/document.lib.php b/public/main/inc/lib/document.lib.php
index f53fa689cd..fa2146ca20 100644
--- a/public/main/inc/lib/document.lib.php
+++ b/public/main/inc/lib/document.lib.php
@@ -259,7 +259,7 @@ class DocumentManager
             'zip' => 'application/zip',
         ];
 
-        if ($filename === true) {
+        if (true === $filename) {
             return $mimeTypes;
         }
 
@@ -342,7 +342,7 @@ class DocumentManager
         $cur = $begin;
         fseek($fm, $begin, 0);
 
-        while (!feof($fm) && $cur <= $end && (connection_status() == 0)) {
+        while (!feof($fm) && $cur <= $end && (0 == connection_status())) {
             echo fread($fm, min(1024 * 16, ($end - $cur) + 1));
             $cur += 1024 * 16;
         }
@@ -352,10 +352,10 @@ class DocumentManager
      * This function streams a file to the client.
      *
      * @param string $full_file_name
-     * @param bool   $forced Wether to force the browser to download the file
+     * @param bool   $forced              Wether to force the browser to download the file
      * @param string $name
      * @param bool   $fixLinksHttpToHttps change file content from http to https
-     * @param array  $extraHeaders Additional headers to be sent
+     * @param array  $extraHeaders        Additional headers to be sent
      *
      * @return false if file doesn't exist, true if stream succeeded
      */
@@ -369,7 +369,7 @@ class DocumentManager
         if (!is_file($full_file_name)) {
             return false;
         }
-        $filename = $name == '' ? basename($full_file_name) : api_replace_dangerous_char($name);
+        $filename = '' == $name ? basename($full_file_name) : api_replace_dangerous_char($name);
         $len = filesize($full_file_name);
         // Fixing error when file name contains a ","
         $filename = str_replace(',', '', $filename);
@@ -418,7 +418,7 @@ class DocumentManager
             return true;
         } else {
             // no forced download, just let the browser decide what to do according to the mimetype
-            $lpFixedEncoding = api_get_setting('lp.fixed_encoding') === 'true';
+            $lpFixedEncoding = 'true' === api_get_setting('lp.fixed_encoding');
 
             // Commented to let courses content to be cached in order to improve performance:
             //header('Expires: Wed, 01 Jan 1990 00:00:00 GMT');
@@ -432,7 +432,7 @@ class DocumentManager
 
             switch ($contentType) {
                 case 'text/html':
-                    if (isset($lpFixedEncoding) && $lpFixedEncoding === 'true') {
+                    if (isset($lpFixedEncoding) && 'true' === $lpFixedEncoding) {
                         $contentType .= '; charset=UTF-8';
                     } else {
                         $encoding = @api_detect_encoding_html(file_get_contents($full_file_name));
@@ -442,7 +442,7 @@ class DocumentManager
                     }
                     break;
                 case 'text/plain':
-                    if (isset($lpFixedEncoding) && $lpFixedEncoding === 'true') {
+                    if (isset($lpFixedEncoding) && 'true' === $lpFixedEncoding) {
                         $contentType .= '; charset=UTF-8';
                     } else {
                         $encoding = @api_detect_encoding(strip_tags(file_get_contents($full_file_name)));
@@ -515,7 +515,7 @@ class DocumentManager
 
         if (!empty($sessionId)) {
             // Chat folder filter
-            if ($path == '/chat_files') {
+            if ('/chat_files' == $path) {
                 $condition .= " AND (docs.session_id = '$sessionId') ";
             }
             // share_folder filter
@@ -561,10 +561,10 @@ class DocumentManager
 
         // The given path will not end with a slash, unless it's the root '/'
         // so no root -> add slash
-        $addedSlash = $path == '/' ? '' : '/';
+        $addedSlash = '/' == $path ? '' : '/';
 
         $sharedCondition = null;
-        if ($originalPath == '/shared_folder') {
+        if ('/shared_folder' == $originalPath) {
             $students = CourseManager::get_user_list_from_course_code($courseInfo['code'], $sessionId);
             if (!empty($students)) {
                 $conditionList = [];
@@ -609,7 +609,7 @@ class DocumentManager
         $documentData = [];
         $isAllowedToEdit = api_is_allowed_to_edit(null, true);
         $isCoach = api_is_coach();
-        if ($result !== false && Database::num_rows($result) != 0) {
+        if (false !== $result && 0 != Database::num_rows($result)) {
             $rows = [];
             $hideInvisibleDocuments = api_get_configuration_value('hide_invisible_course_documents_in_sessions');
             while ($row = Database::fetch_array($result, 'ASSOC')) {
@@ -659,8 +659,8 @@ class DocumentManager
             }
 
             foreach ($rows as $row) {
-                if ($row['filetype'] == 'file' &&
-                    pathinfo($row['path'], PATHINFO_EXTENSION) == 'html'
+                if ('file' == $row['filetype'] &&
+                    'html' == pathinfo($row['path'], PATHINFO_EXTENSION)
                 ) {
                     // Templates management
                     $tblTemplate = Database::get_main_table(TABLE_MAIN_TEMPLATES);
@@ -750,7 +750,7 @@ class DocumentManager
         }
 
         $show_users_condition = '';
-        if (api_get_setting('show_users_folders') === 'false') {
+        if ('false' === api_get_setting('show_users_folders')) {
             $show_users_condition = " AND docs.path NOT LIKE '%shared_folder%'";
         }
 
@@ -774,20 +774,20 @@ class DocumentManager
                         l.visibility NOT IN ('".ResourceLink::VISIBILITY_DELETED."')
                         $condition_session ";
 
-            if ($groupIid != 0) {
+            if (0 != $groupIid) {
                 $sql .= " AND docs.path NOT LIKE '%shared_folder%' ";
             } else {
                 $sql .= $show_users_condition;
             }
 
             $result = Database::query($sql);
-            if ($result && Database::num_rows($result) != 0) {
+            if ($result && 0 != Database::num_rows($result)) {
                 while ($row = Database::fetch_array($result, 'ASSOC')) {
                     if (self::is_folder_to_avoid($row['path'])) {
                         continue;
                     }
 
-                    if (strpos($row['path'], '/shared_folder/') !== false) {
+                    if (false !== strpos($row['path'], '/shared_folder/')) {
                         if (!in_array($row['path'], $conditionList)) {
                             continue;
                         }
@@ -931,7 +931,7 @@ class DocumentManager
         /** @var CDocument $document */
         $document = $repo->find($document_id);
 
-        if ($document === null) {
+        if (null === $document) {
             return false;
         }
 
@@ -960,7 +960,7 @@ class DocumentManager
                 WHERE c_id = $course_id AND id= $id";
         $result = Database::fetch_array(Database::query($sql), 'ASSOC');
 
-        return $result['filetype'] === 'folder';
+        return 'folder' === $result['filetype'];
     }
 
     /**
@@ -1089,7 +1089,7 @@ class DocumentManager
     public static function delete_document_from_search_engine($course_id, $document_id)
     {
         // remove from search engine if enabled
-        if (api_get_setting('search_enabled') === 'true') {
+        if ('true' === api_get_setting('search_enabled')) {
             $tbl_se_ref = Database::get_main_table(TABLE_MAIN_SEARCH_ENGINE_REF);
             $sql = 'SELECT * FROM %s WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=%s LIMIT 1';
             $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_DOCUMENT, $document_id);
@@ -1189,7 +1189,7 @@ class DocumentManager
 
         $result = Database::query($sql);
         $courseParam = '&cidReq='.$course_code.'&id='.$id.'&id_session='.$session_id.'&gidReq='.$groupId;
-        if ($result && Database::num_rows($result) == 1) {
+        if ($result && 1 == Database::num_rows($result)) {
             $row = Database::fetch_array($result, 'ASSOC');
             //@todo need to clarify the name of the URLs not nice right now
             $url_path = urlencode($row['path']);
@@ -1204,7 +1204,7 @@ class DocumentManager
             $row['direct_url'] = $www.$path;
             $row['basename'] = basename($row['path']);
 
-            if (dirname($row['path']) == '.') {
+            if ('.' == dirname($row['path'])) {
                 $row['parent_id'] = '0';
             } else {
                 $row['parent_id'] = self::get_document_id($course_info, dirname($row['path']), $session_id);
@@ -1226,7 +1226,7 @@ class DocumentManager
                 for ($i = 1; $i < $array_len; $i++) {
                     $real_dir .= '/'.(isset($dir_array[$i]) ? $dir_array[$i] : '');
                     $parent_id = self::get_document_id($course_info, $real_dir);
-                    if ($session_id != 0 && empty($parent_id)) {
+                    if (0 != $session_id && empty($parent_id)) {
                         $parent_id = self::get_document_id($course_info, $real_dir, 0);
                     }
                     if (!empty($parent_id)) {
@@ -1236,7 +1236,7 @@ class DocumentManager
                             false,
                             $session_id
                         );
-                        if ($session_id != 0 and !$sub_document_data) {
+                        if (0 != $session_id and !$sub_document_data) {
                             $sub_document_data = self::get_document_data_by_id(
                                 $parent_id,
                                 $course_code,
@@ -1403,7 +1403,7 @@ class DocumentManager
             $repo = $em->getRepository('ChamiloCourseBundle:CDocument');
             /** @var \Chamilo\CourseBundle\Entity\CDocument $document */
             $document = $repo->find($row['iid']);
-            if ($document->getVisibility() === ResourceLink::VISIBILITY_PUBLISHED) {
+            if (ResourceLink::VISIBILITY_PUBLISHED === $document->getVisibility()) {
                 $is_visible = api_is_allowed_in_course() || api_is_platform_admin();
             }
         }
@@ -1453,7 +1453,7 @@ class DocumentManager
         $sessionId = (int) $sessionId;
         // 2. Course and Session visibility are handle in local.inc.php/global.inc.php
         // 3. Checking if user exist in course/session
-        if ($sessionId == 0) {
+        if (0 == $sessionId) {
             if (is_null($userIsSubscribed)) {
                 $userIsSubscribed = CourseManager::is_user_subscribed_in_course(
                     $user_id,
@@ -1461,7 +1461,7 @@ class DocumentManager
                 );
             }
 
-            if ($userIsSubscribed === true || api_is_platform_admin()) {
+            if (true === $userIsSubscribed || api_is_platform_admin()) {
                 $user_in_course = true;
             }
 
@@ -1499,7 +1499,7 @@ class DocumentManager
             /** @var CDocument $document */
             $document = $repo->find($doc_id);
             $link = $document->getCourseSessionResourceLink($course_info['entity']);
-            if ($link && $link->getVisibility() == ResourceLink::VISIBILITY_PUBLISHED) {
+            if ($link && ResourceLink::VISIBILITY_PUBLISHED == $link->getVisibility()) {
                 return true;
             }
 
@@ -1573,7 +1573,7 @@ class DocumentManager
 
         $rs = Database::query($sql);
         $num = Database::num_rows($rs);
-        if ($num == 0) {
+        if (0 == $num) {
             return null;
         }
         $row = Database::fetch_array($rs);
@@ -1782,7 +1782,7 @@ class DocumentManager
         if ((int) $default_certificate == (int) $default_certificate_id) {
             $tbl_category = Database::get_main_table(TABLE_MAIN_GRADEBOOK_CATEGORY);
             $session_id = api_get_session_id();
-            if ($session_id == 0 || is_null($session_id)) {
+            if (0 == $session_id || is_null($session_id)) {
                 $sql_session = 'AND (session_id='.intval($session_id).' OR isnull(session_id)) ';
             } elseif ($session_id > 0) {
                 $sql_session = 'AND session_id='.intval($session_id);
@@ -1861,11 +1861,11 @@ class DocumentManager
         $is_certificate_mode = false;
         $is_certificate_array = explode('/', $dir);
         array_shift($is_certificate_array);
-        if (isset($is_certificate_array[0]) && $is_certificate_array[0] == 'certificates') {
+        if (isset($is_certificate_array[0]) && 'certificates' == $is_certificate_array[0]) {
             $is_certificate_mode = true;
         }
 
-        return $is_certificate_mode || (isset($_GET['certificate']) && $_GET['certificate'] === 'true');
+        return $is_certificate_mode || (isset($_GET['certificate']) && 'true' === $_GET['certificate']);
     }
 
     /**
@@ -1958,7 +1958,7 @@ class DocumentManager
                             if (strpos($source, '+this.')) {
                                 continue; //javascript code - will still work unaltered
                             }
-                            if (strpos($source, '.') === false) {
+                            if (false === strpos($source, '.')) {
                                 continue; //no dot, should not be an external file anyway
                             }
                             if (strpos($source, 'mailto:')) {
@@ -1968,7 +1968,7 @@ class DocumentManager
                                 continue; //avoid code - that should help
                             }
 
-                            if ($attr == 'value') {
+                            if ('value' == $attr) {
                                 if (strpos($source, 'mp3file')) {
                                     $files_list[] = [
                                         substr($source, 0, strpos($source, '.swf') + 4),
@@ -1976,18 +1976,18 @@ class DocumentManager
                                         'abs',
                                     ];
                                     $mp3file = substr($source, strpos($source, 'mp3file=') + 8);
-                                    if (substr($mp3file, 0, 1) == '/') {
+                                    if ('/' == substr($mp3file, 0, 1)) {
                                         $files_list[] = [$mp3file, 'local', 'abs'];
                                     } else {
                                         $files_list[] = [$mp3file, 'local', 'rel'];
                                     }
-                                } elseif (strpos($source, 'flv=') === 0) {
+                                } elseif (0 === strpos($source, 'flv=')) {
                                     $source = substr($source, 4);
                                     if (strpos($source, '&') > 0) {
                                         $source = substr($source, 0, strpos($source, '&'));
                                     }
                                     if (strpos($source, '://') > 0) {
-                                        if (strpos($source, api_get_path(WEB_PATH)) !== false) {
+                                        if (false !== strpos($source, api_get_path(WEB_PATH))) {
                                             //we found the current portal url
                                             $files_list[] = [$source, 'local', 'url'];
                                         } else {
@@ -2011,7 +2011,7 @@ class DocumentManager
                                         $pos1 = strpos($second_part, '=');
                                         $pos2 = strpos($second_part, '&');
                                         $second_part = substr($second_part, $pos1 + 1, $pos2 - ($pos1 + 1));
-                                        if (strpos($second_part, api_get_path(WEB_PATH)) !== false) {
+                                        if (false !== strpos($second_part, api_get_path(WEB_PATH))) {
                                             //we found the current portal url
                                             $files_list[] = [$second_part, 'local', 'url'];
                                             $in_files_list[] = self::get_resources_from_source_html(
@@ -2028,7 +2028,7 @@ class DocumentManager
                                             $files_list[] = [$second_part, 'remote', 'url'];
                                         }
                                     } elseif (strpos($second_part, '=') > 0) {
-                                        if (substr($second_part, 0, 1) === '/') {
+                                        if ('/' === substr($second_part, 0, 1)) {
                                             //link starts with a /, making it absolute (relative to DocumentRoot)
                                             $files_list[] = [$second_part, 'local', 'abs'];
                                             $in_files_list[] = self::get_resources_from_source_html(
@@ -2040,7 +2040,7 @@ class DocumentManager
                                             if (count($in_files_list) > 0) {
                                                 $files_list = array_merge($files_list, $in_files_list);
                                             }
-                                        } elseif (strstr($second_part, '..') === 0) {
+                                        } elseif (0 === strstr($second_part, '..')) {
                                             //link is relative but going back in the hierarchy
                                             $files_list[] = [$second_part, 'local', 'rel'];
                                             //$dir = api_get_path(SYS_CODE_PATH);//dirname($abs_path);
@@ -2061,7 +2061,7 @@ class DocumentManager
                                             }
                                         } else {
                                             //no starting '/', making it relative to current document's path
-                                            if (substr($second_part, 0, 2) == './') {
+                                            if ('./' == substr($second_part, 0, 2)) {
                                                 $second_part = substr($second_part, 2);
                                             }
                                             $files_list[] = [$second_part, 'local', 'rel'];
@@ -2084,7 +2084,7 @@ class DocumentManager
                                     //leave that second part behind now
                                     $source = substr($source, 0, strpos($source, '?'));
                                     if (strpos($source, '://') > 0) {
-                                        if (strpos($source, api_get_path(WEB_PATH)) !== false) {
+                                        if (false !== strpos($source, api_get_path(WEB_PATH))) {
                                             //we found the current portal url
                                             $files_list[] = [$source, 'local', 'url'];
                                             $in_files_list[] = self::get_resources_from_source_html(
@@ -2102,7 +2102,7 @@ class DocumentManager
                                         }
                                     } else {
                                         //no protocol found, make link local
-                                        if (substr($source, 0, 1) === '/') {
+                                        if ('/' === substr($source, 0, 1)) {
                                             //link starts with a /, making it absolute (relative to DocumentRoot)
                                             $files_list[] = [$source, 'local', 'abs'];
                                             $in_files_list[] = self::get_resources_from_source_html(
@@ -2114,7 +2114,7 @@ class DocumentManager
                                             if (count($in_files_list) > 0) {
                                                 $files_list = array_merge($files_list, $in_files_list);
                                             }
-                                        } elseif (strstr($source, '..') === 0) {
+                                        } elseif (0 === strstr($source, '..')) {
                                             //link is relative but going back in the hierarchy
                                             $files_list[] = [$source, 'local', 'rel'];
                                             $dir = '';
@@ -2133,7 +2133,7 @@ class DocumentManager
                                             }
                                         } else {
                                             //no starting '/', making it relative to current document's path
-                                            if (substr($source, 0, 2) == './') {
+                                            if ('./' == substr($source, 0, 2)) {
                                                 $source = substr($source, 2);
                                             }
                                             $files_list[] = [$source, 'local', 'rel'];
@@ -2155,7 +2155,7 @@ class DocumentManager
                                     }
                                 }
                                 //found some protocol there
-                                if (strpos($source, api_get_path(WEB_PATH)) !== false) {
+                                if (false !== strpos($source, api_get_path(WEB_PATH))) {
                                     //we found the current portal url
                                     $files_list[] = [$source, 'local', 'url'];
                                     $in_files_list[] = self::get_resources_from_source_html(
@@ -2173,7 +2173,7 @@ class DocumentManager
                                 }
                             } else {
                                 //no protocol found, make link local
-                                if (substr($source, 0, 1) === '/') {
+                                if ('/' === substr($source, 0, 1)) {
                                     //link starts with a /, making it absolute (relative to DocumentRoot)
                                     $files_list[] = [$source, 'local', 'abs'];
                                     $in_files_list[] = self::get_resources_from_source_html(
@@ -2185,7 +2185,7 @@ class DocumentManager
                                     if (count($in_files_list) > 0) {
                                         $files_list = array_merge($files_list, $in_files_list);
                                     }
-                                } elseif (strpos($source, '..') === 0) {
+                                } elseif (0 === strpos($source, '..')) {
                                     //link is relative but going back in the hierarchy
                                     $files_list[] = [$source, 'local', 'rel'];
                                     $dir = '';
@@ -2204,7 +2204,7 @@ class DocumentManager
                                     }
                                 } else {
                                     //no starting '/', making it relative to current document's path
-                                    if (substr($source, 0, 2) == './') {
+                                    if ('./' == substr($source, 0, 2)) {
                                         $source = substr($source, 2);
                                     }
                                     $files_list[] = [$source, 'local', 'rel'];
@@ -2314,11 +2314,11 @@ class DocumentManager
                         if ($name == $check) {
                             $attributes[strtolower($name)][] = strtolower($name);
                         } else {
-                            if (!empty($value) && ($value[0] == '\'' || $value[0] == '"')) {
+                            if (!empty($value) && ('\'' == $value[0] || '"' == $value[0])) {
                                 $value = substr($value, 1, -1);
                             }
 
-                            if ($value == 'API.LMSGetValue(name') {
+                            if ('API.LMSGetValue(name' == $value) {
                                 $value = 'API.LMSGetValue(name)';
                             }
                             //Gets the xx.flv value from the string flashvars="width=320&height=240&autostart=false&file=xxx.flv&repeat=false"
@@ -2404,16 +2404,16 @@ class DocumentManager
 
                 if (!empty($real_orig_query)) {
                     $dest_url_query = '?'.$real_orig_query;
-                    if (strpos($dest_url_query, $origin_course_code) !== false) {
+                    if (false !== strpos($dest_url_query, $origin_course_code)) {
                         $dest_url_query = str_replace($origin_course_code, $destination_course_code, $dest_url_query);
                     }
                 }
 
-                if ($scope_url == 'local') {
-                    if ($type_url == 'abs' || $type_url == 'rel') {
+                if ('local' == $scope_url) {
+                    if ('abs' == $type_url || 'rel' == $type_url) {
                         $document_file = strstr($real_orig_path, 'document');
 
-                        if (strpos($real_orig_path, $document_file) !== false) {
+                        if (false !== strpos($real_orig_path, $document_file)) {
                             $origin_filepath = $orig_course_path.$document_file;
                             $destination_filepath = $dest_course_path.$document_file;
 
@@ -2465,7 +2465,7 @@ class DocumentManager
                             }
 
                             // Replace origin course path by destination course path.
-                            if (strpos($content_html, $real_orig_url) !== false) {
+                            if (false !== strpos($content_html, $real_orig_url)) {
                                 $url_course_path = str_replace(
                                     $orig_course_info_path.'/'.$document_file,
                                     '',
@@ -2474,7 +2474,7 @@ class DocumentManager
                                 // See BT#7780
                                 $destination_url = $dest_course_path_rel.$document_file.$dest_url_query;
                                 // If the course code doesn't exist in the path? what we do? Nothing! see BT#1985
-                                if (strpos($real_orig_path, $origin_course_code) === false) {
+                                if (false === strpos($real_orig_path, $origin_course_code)) {
                                     $url_course_path = $real_orig_path;
                                     $destination_url = $real_orig_path;
                                 }
@@ -2483,7 +2483,7 @@ class DocumentManager
                         }
 
                         // replace origin course code by destination course code  from origin url
-                        if (strpos($real_orig_url, '?') === 0) {
+                        if (0 === strpos($real_orig_url, '?')) {
                             $dest_url = str_replace($origin_course_code, $destination_course_code, $real_orig_url);
                             $content_html = str_replace($real_orig_url, $dest_url, $content_html);
                         }
@@ -2526,7 +2526,7 @@ class DocumentManager
         //$filePath = api_get_path(SYS_COURSE_PATH).$course_data['path'].'/document'.$document_data['path'];
         $pageFormat = 'A4';
         $pdfOrientation = 'P';
-        if ($orientation === 'landscape') {
+        if ('landscape' === $orientation) {
             $pageFormat = 'A4-L';
             $pdfOrientation = 'L';
         }
@@ -2619,7 +2619,7 @@ class DocumentManager
                 );
 
                 // Showing message when sending zip files
-                if ($document && $unzip == 1) {
+                if ($document && 1 == $unzip) {
                     if ($show_output) {
                         echo Display::return_message(
                             get_lang('File upload succeeded!').'<br />',
@@ -2672,7 +2672,7 @@ class DocumentManager
             case 'application/postscript':
                 $temp_file = tempnam(sys_get_temp_dir(), 'chamilo');
                 exec("ps2pdf $doc_path $temp_file", $output, $ret_val);
-                if ($ret_val !== 0) { // shell fail, probably 127 (command not found)
+                if (0 !== $ret_val) { // shell fail, probably 127 (command not found)
                     return false;
                 }
                 exec("pdftotext $temp_file -", $output, $ret_val);
@@ -2688,7 +2688,7 @@ class DocumentManager
                 // Note: correct handling of code pages in unrtf
                 // on debian lenny unrtf v0.19.2 can not, but unrtf v0.20.5 can
                 exec("unrtf --text $doc_path", $output, $ret_val);
-                if ($ret_val == 127) { // command not found
+                if (127 == $ret_val) { // command not found
                     return false;
                 }
                 // Avoid index unrtf comments
@@ -2714,7 +2714,7 @@ class DocumentManager
 
         $content = '';
         if (!is_null($ret_val)) {
-            if ($ret_val !== 0) { // shell fail, probably 127 (command not found)
+            if (0 !== $ret_val) { // shell fail, probably 127 (command not found)
                 return false;
             }
         }
@@ -2969,7 +2969,7 @@ class DocumentManager
         }
 
         $parentData = [];
-        if ($folderId !== false) {
+        if (false !== $folderId) {
             $parentData = self::get_document_data_by_id(
                 $folderId,
                 $course_info['code'],
@@ -2998,7 +2998,7 @@ class DocumentManager
         }
 
         $levelCondition = '';
-        if ($folderId === false) {
+        if (false === $folderId) {
             $levelCondition = " AND docs.path NOT LIKE'/%/%'";
         }
 
@@ -3019,8 +3019,8 @@ class DocumentManager
         $resources = Database::store_result($res_doc, 'ASSOC');
 
         $return = '';
-        if ($lp_id == false && $addCloseButton) {
-            if ($folderId === false) {
+        if (false == $lp_id && $addCloseButton) {
+            if (false === $folderId) {
                 $return .= Display::div(
                     Display::url(
                         Display::return_icon('close.png', get_lang('Close'), [], ICON_SIZE_SMALL),
@@ -3043,7 +3043,7 @@ class DocumentManager
                     api_get_user_id()
                 );
 
-                if ($showInvisibleFiles === false) {
+                if (false === $showInvisibleFiles) {
                     if (!$is_visible) {
                         continue;
                     }
@@ -3056,7 +3056,7 @@ class DocumentManager
         $label = get_lang('Documents');
 
         $documents = [];
-        if ($folderId === false) {
+        if (false === $folderId) {
             $documents[$label] = [
                 'id' => 0,
                 'files' => $newResources,
@@ -3084,7 +3084,7 @@ class DocumentManager
 
         $return .= $writeResult;
         $lpAjaxUrl = api_get_path(WEB_AJAX_PATH).'lp.ajax.php';
-        if ($lp_id === false) {
+        if (false === $lp_id) {
             $url = $lpAjaxUrl.'?a=get_documents&lp_id=&cidReq='.$course_info['code'];
             $return .= "<script>
             $(function() {
@@ -3187,7 +3187,7 @@ class DocumentManager
                         'title' => $key,
                     ];
 
-                    if ($folderId === false) {
+                    if (false === $folderId) {
                         $return .= self::parseFolder($folderId, $mainFolderResource, $lp_id);
                     }
 
@@ -3206,7 +3206,7 @@ class DocumentManager
                     $return .= '</div>';
                     $return .= '</ul>';
                 } else {
-                    if ($resource['filetype'] === 'folder') {
+                    if ('folder' === $resource['filetype']) {
                         $return .= self::parseFolder($folderId, $resource, $lp_id);
                     } else {
                         $return .= self::parseFile(
@@ -3262,7 +3262,7 @@ class DocumentManager
             $sessionId
         );
 
-        if ($sessionId != 0 && !$document_data) {
+        if (0 != $sessionId && !$document_data) {
             $document_data = self::get_document_data_by_id(
                 $doc_id,
                 $courseCode,
@@ -3277,7 +3277,7 @@ class DocumentManager
                 return true;
             }
 
-            if ($document_data['parent_id'] == false || empty($document_data['parent_id'])) {
+            if (false == $document_data['parent_id'] || empty($document_data['parent_id'])) {
                 if (!empty($groupId)) {
                     return true;
                 }
@@ -3330,7 +3330,7 @@ class DocumentManager
         $if_exists = '',
         $simulation = false
     ) {
-        if (api_get_setting('search_enabled') !== 'true') {
+        if ('true' !== api_get_setting('search_enabled')) {
             return false;
         }
         if (empty($docid) or $docid != intval($docid)) {
@@ -3349,7 +3349,7 @@ class DocumentManager
 
         $qry = "SELECT path, title FROM $table_document WHERE c_id = $course_id AND id = '$docid' LIMIT 1";
         $result = Database::query($qry);
-        if (Database::num_rows($result) == 1) {
+        if (1 == Database::num_rows($result)) {
             $row = Database::fetch_array($result);
             $doc_path = api_get_path(SYS_COURSE_PATH).$course_dir.$row['path'];
             //TODO: mime_content_type is deprecated, fileinfo php extension is enabled by default as of PHP 5.3.0
@@ -3425,7 +3425,7 @@ class DocumentManager
                  * overwriten. Now all work is done at
                  * handle_uploaded_document() and it's difficult to verify it
                  */
-                if (!empty($if_exists) && $if_exists == 'overwrite') {
+                if (!empty($if_exists) && 'overwrite' == $if_exists) {
                     // Overwrite the file on search engine
                     // Actually, it consists on a delete of terms from db,
                     // insert new ones, create a new search engine document,
@@ -3620,50 +3620,50 @@ class DocumentManager
         $extensionListFromDrawing = ['odg'];
         $extensionListToDrawing = ['svg', 'swf'];
 
-        if ($mode === 'from') {
-            if ($format === 'text') {
+        if ('from' === $mode) {
+            if ('text' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListFromText);
-            } elseif ($format === 'spreadsheet') {
+            } elseif ('spreadsheet' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListFromSpreadsheet);
-            } elseif ($format === 'presentation') {
+            } elseif ('presentation' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListFromPresentation);
-            } elseif ($format === 'drawing') {
+            } elseif ('drawing' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListFromDrawing);
-            } elseif ($format === 'all') {
+            } elseif ('all' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListFromText);
                 $extensionList = array_merge($extensionList, $extensionListFromSpreadsheet);
                 $extensionList = array_merge($extensionList, $extensionListFromPresentation);
                 $extensionList = array_merge($extensionList, $extensionListFromDrawing);
             }
-        } elseif ($mode === 'to') {
-            if ($format === 'text') {
+        } elseif ('to' === $mode) {
+            if ('text' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListToText);
-            } elseif ($format === 'spreadsheet') {
+            } elseif ('spreadsheet' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListToSpreadsheet);
-            } elseif ($format === 'presentation') {
+            } elseif ('presentation' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListToPresentation);
-            } elseif ($format === 'drawing') {
+            } elseif ('drawing' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListToDrawing);
-            } elseif ($format === 'all') {
+            } elseif ('all' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListToText);
                 $extensionList = array_merge($extensionList, $extensionListToSpreadsheet);
                 $extensionList = array_merge($extensionList, $extensionListToPresentation);
                 $extensionList = array_merge($extensionList, $extensionListToDrawing);
             }
-        } elseif ($mode === 'all') {
-            if ($format === 'text') {
+        } elseif ('all' === $mode) {
+            if ('text' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListFromText);
                 $extensionList = array_merge($extensionList, $extensionListToText);
-            } elseif ($format === 'spreadsheet') {
+            } elseif ('spreadsheet' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListFromSpreadsheet);
                 $extensionList = array_merge($extensionList, $extensionListToSpreadsheet);
-            } elseif ($format === 'presentation') {
+            } elseif ('presentation' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListFromPresentation);
                 $extensionList = array_merge($extensionList, $extensionListToPresentation);
-            } elseif ($format === 'drawing') {
+            } elseif ('drawing' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListFromDrawing);
                 $extensionList = array_merge($extensionList, $extensionListToDrawing);
-            } elseif ($format === 'all') {
+            } elseif ('all' === $format) {
                 $extensionList = array_merge($extensionList, $extensionListFromText);
                 $extensionList = array_merge($extensionList, $extensionListToText);
                 $extensionList = array_merge($extensionList, $extensionListFromSpreadsheet);
@@ -3717,15 +3717,15 @@ class DocumentManager
         ];
         $systemFolder = api_get_course_setting('show_system_folders');
 
-        if ($systemFolder == 1) {
+        if (1 == $systemFolder) {
             $foldersToAvoid = [];
         }
 
-        if (basename($path) == 'css') {
+        if ('css' == basename($path)) {
             return true;
         }
 
-        if ($is_certificate_mode == false) {
+        if (false == $is_certificate_mode) {
             //Certificate results
             if (strstr($path, 'certificates')) {
                 return true;
@@ -3733,7 +3733,7 @@ class DocumentManager
         }
 
         // Admin setting for Hide/Show the folders of all users
-        if (api_get_setting('show_users_folders') == 'false') {
+        if ('false' == api_get_setting('show_users_folders')) {
             $foldersToAvoid[] = '/shared_folder';
 
             if (strstr($path, 'shared_folder_session_')) {
@@ -3742,7 +3742,7 @@ class DocumentManager
         }
 
         // Admin setting for Hide/Show Default folders to all users
-        if (api_get_setting('show_default_folders') == 'false') {
+        if ('false' == api_get_setting('show_default_folders')) {
             $foldersToAvoid[] = '/images';
             $foldersToAvoid[] = '/flash';
             $foldersToAvoid[] = '/audio';
@@ -3750,7 +3750,7 @@ class DocumentManager
         }
 
         // Admin setting for Hide/Show chat history folder
-        if (api_get_setting('show_chat_folder') == 'false') {
+        if ('false' == api_get_setting('show_chat_folder')) {
             $foldersToAvoid[] = '/chat_files';
         }
 
@@ -3805,14 +3805,14 @@ class DocumentManager
 
         if (isset($settings['documents'])) {
             $portalDefaultVisibility = 'invisible';
-            if ($settings['documents'] == 'true') {
+            if ('true' == $settings['documents']) {
                 $portalDefaultVisibility = 'visible';
             }
 
             $defaultVisibility = $portalDefaultVisibility;
         }
 
-        if (api_get_setting('documents_default_visibility_defined_in_course') == 'true') {
+        if ('true' == api_get_setting('documents_default_visibility_defined_in_course')) {
             $courseVisibility = api_get_course_setting('documents_default_visibility', $courseCode);
             if (!empty($courseVisibility) && in_array($courseVisibility, ['visible', 'invisible'])) {
                 $defaultVisibility = $courseVisibility;
@@ -4263,11 +4263,11 @@ class DocumentManager
         $fileName = pathinfo($name, PATHINFO_FILENAME);
         $dir = pathinfo($name, PATHINFO_DIRNAME);
 
-        if ($dir == '.') {
+        if ('.' == $dir) {
             $dir = null;
         }
 
-        if (!empty($dir) && $dir != '/') {
+        if (!empty($dir) && '/' != $dir) {
             $dir = $dir.'/';
         }
 
@@ -4523,7 +4523,7 @@ class DocumentManager
                         $label = ' &mdash; '.$folder_titles[$folder];
                     }
                     $parent_select->addOption($label, $folder_id);
-                    if ($selected != '') {
+                    if ('' != $selected) {
                         $parent_select->setSelected($folder_id);
                     }
                 }
@@ -4541,7 +4541,7 @@ class DocumentManager
                         $label = str_repeat('&nbsp;&nbsp;&nbsp;', count($path_parts) - 2).' &mdash; '.$label;
                     }
                     $parent_select->addOption($label, $folder_id);
-                    if ($selected != '') {
+                    if ('' != $selected) {
                         $parent_select->setSelected($folder_id);
                     }
                 }
@@ -4587,7 +4587,7 @@ class DocumentManager
         $webODFList = self::get_web_odf_extension_list();
 
         // Get the title or the basename depending on what we're using
-        if ($document_data['title'] != '') {
+        if ('' != $document_data['title']) {
             $title = $document_data['title'];
         } else {
             $title = basename($document_data['path']);
@@ -4607,7 +4607,7 @@ class DocumentManager
         if ($addToEditor) {
             $classAddToEditor = 'select_to_ckeditor';
         }
-        $visibility_class = $visibility === false ? ' class="muted"' : ' class="'.$classAddToEditor.'" ';
+        $visibility_class = false === $visibility ? ' class="muted"' : ' class="'.$classAddToEditor.'" ';
 
         $forcedownload_link = '';
         $forcedownload_icon = '';
@@ -4616,19 +4616,19 @@ class DocumentManager
 
         if (!$show_as_icon) {
             // Build download link (icon)
-            $forcedownload_link = $filetype === 'folder'
+            $forcedownload_link = 'folder' === $filetype
                 ? $pageUrl.'?'.$courseParams.'&action=downloadfolder&id='.$document_data['id']
                 : $pageUrl.'?'.$courseParams.'&action=download&id='.$document_data['id'];
             // Folder download or file download?
-            $forcedownload_icon = $filetype === 'folder' ? 'save_pack.png' : 'save.png';
+            $forcedownload_icon = 'folder' === $filetype ? 'save_pack.png' : 'save.png';
             // Prevent multiple clicks on zipped folder download
-            $prevent_multiple_click = $filetype === 'folder' ? " onclick=\"javascript: if(typeof clic_$dbl_click_id == 'undefined' || !clic_$dbl_click_id) { clic_$dbl_click_id=true; window.setTimeout('clic_".($dbl_click_id++)."=false;',10000); } else { return false; }\"" : '';
+            $prevent_multiple_click = 'folder' === $filetype ? " onclick=\"javascript: if(typeof clic_$dbl_click_id == 'undefined' || !clic_$dbl_click_id) { clic_$dbl_click_id=true; window.setTimeout('clic_".($dbl_click_id++)."=false;',10000); } else { return false; }\"" : '';
         }
 
         $target = '_self';
         $is_browser_viewable_file = false;
 
-        if ($filetype === 'file') {
+        if ('file' === $filetype) {
             // Check the extension
             $ext = explode('.', $path);
             $ext = strtolower($ext[count($ext) - 1]);
@@ -4636,7 +4636,7 @@ class DocumentManager
             // HTML-files an some other types are shown in a frameset by default.
             $is_browser_viewable_file = self::isBrowserViewable($ext);
             if ($is_browser_viewable_file) {
-                if ($ext == 'pdf' || in_array($ext, $webODFList)) {
+                if ('pdf' == $ext || in_array($ext, $webODFList)) {
                     $url = $pageUrl.'?'.$courseParams.'&action=download&amp;id='.$document_data['id'];
                 } else {
                     $url = $basePageUrl.'showinframes.php?'.$courseParams.'&id='.$document_data['id'];
@@ -4656,31 +4656,31 @@ class DocumentManager
         $tooltip_title = $title;
         $tooltip_title_alt = $tooltip_title;
 
-        if ($filetype == 'link') {
+        if ('link' == $filetype) {
             $tooltip_title_alt = $title;
             $url = $document_data['comment'].'" target="_blank';
         }
 
-        if ($path === '/shared_folder') {
+        if ('/shared_folder' === $path) {
             $tooltip_title_alt = get_lang('Folders of users');
         } elseif (strstr($path, 'shared_folder_session_')) {
             $tooltip_title_alt = get_lang('Folders of users').' ('.api_get_session_name($sessionId).')';
         } elseif (strstr($tooltip_title, 'sf_user_')) {
             $userinfo = api_get_user_info(substr($tooltip_title, 8));
             $tooltip_title_alt = get_lang('User folder').' '.$userinfo['complete_name'];
-        } elseif ($path == '/chat_files') {
+        } elseif ('/chat_files' == $path) {
             $tooltip_title_alt = get_lang('Chat conversations history');
-        } elseif ($path == '/learning_path') {
+        } elseif ('/learning_path' == $path) {
             $tooltip_title_alt = get_lang('Learning paths');
-        } elseif ($path == '/video') {
+        } elseif ('/video' == $path) {
             $tooltip_title_alt = get_lang('Video');
-        } elseif ($path == '/audio') {
+        } elseif ('/audio' == $path) {
             $tooltip_title_alt = get_lang('Audio');
-        } elseif ($path == '/flash') {
+        } elseif ('/flash' == $path) {
             $tooltip_title_alt = get_lang('Flash');
-        } elseif ($path == '/images') {
+        } elseif ('/images' == $path) {
             $tooltip_title_alt = get_lang('Images');
-        } elseif ($path == '/images/gallery') {
+        } elseif ('/images/gallery' == $path) {
             $tooltip_title_alt = get_lang('Gallery');
         }
 
@@ -4692,10 +4692,10 @@ class DocumentManager
         $document_data['file_extension'] = $extension;
 
         if (!$show_as_icon) {
-            if ($filetype === 'folder') {
+            if ('folder' === $filetype) {
                 if ($isAllowedToEdit ||
                     $isAdmin ||
-                    api_get_setting('students_download_folders') == 'true'
+                    'true' == api_get_setting('students_download_folders')
                 ) {
                     // filter: when I am into a shared folder, I can only show "my shared folder" for donwload
                     if (self::is_shared_folder($curdirpath, $sessionId)) {
@@ -4703,26 +4703,26 @@ class DocumentManager
                             preg_match('/shared_folder_session_'.$sessionId.'\/sf_user_'.api_get_user_id().'$/', urldecode($forcedownload_link)) ||
                             $isAllowedToEdit || $isAdmin
                         ) {
-                            $force_download_html = ($size == 0) ? '' : '<a href="'.$forcedownload_link.'" style="float:right"'.$prevent_multiple_click.'>'.
+                            $force_download_html = (0 == $size) ? '' : '<a href="'.$forcedownload_link.'" style="float:right"'.$prevent_multiple_click.'>'.
                                 Display::return_icon($forcedownload_icon, get_lang('Download'), [], ICON_SIZE_SMALL).'</a>';
                         }
                     } elseif (!preg_match('/shared_folder/', urldecode($forcedownload_link)) ||
                         $isAllowedToEdit ||
                         $isAdmin
                     ) {
-                        $force_download_html = ($size == 0) ? '' : '<a href="'.$forcedownload_link.'" style="float:right"'.$prevent_multiple_click.'>'.
+                        $force_download_html = (0 == $size) ? '' : '<a href="'.$forcedownload_link.'" style="float:right"'.$prevent_multiple_click.'>'.
                             Display::return_icon($forcedownload_icon, get_lang('Download'), [], ICON_SIZE_SMALL).'</a>';
                     }
                 }
             } else {
-                $force_download_html = $size == 0 ? '' : '<a href="'.$forcedownload_link.'" style="float:right"'.$prevent_multiple_click.' download="'.$document_data['basename'].'">'.
+                $force_download_html = 0 == $size ? '' : '<a href="'.$forcedownload_link.'" style="float:right"'.$prevent_multiple_click.' download="'.$document_data['basename'].'">'.
                     Display::return_icon($forcedownload_icon, get_lang('Download'), [], ICON_SIZE_SMALL).'</a>';
             }
 
             $pdf_icon = '';
             if (!$isAllowedToEdit &&
-                api_get_setting('students_export2pdf') == 'true' &&
-                $filetype === 'file' &&
+                'true' == api_get_setting('students_export2pdf') &&
+                'file' === $filetype &&
                 in_array($extension, ['html', 'htm'])
             ) {
                 $pdf_icon = ' <a style="float:right".'.$prevent_multiple_click.' href="'.$pageUrl.'?'.$courseParams.'&action=export_to_pdf&id='.$document_data['id'].'&curdirpath='.$curdirpath.'">'.
@@ -4739,14 +4739,14 @@ class DocumentManager
                 $open_in_new_window_link = '';
                 $send_to = '';
                 $pdf_icon = '';
-                if ($filetype === 'folder') {
+                if ('folder' === $filetype) {
                     $url = $editorUrl.'/'.$document_data['id'].'/?'.api_get_cidreq();
                 } else {
                     $url = $documentWebPath.str_replace('%2F', '/', $url_path).'?'.$courseParams;
                 }
             }
 
-            if ($filetype === 'file') {
+            if ('file' === $filetype) {
                 // Sound preview
                 if (preg_match('/mp3$/i', urldecode($checkExtension)) ||
                     (preg_match('/wav$/i', urldecode($checkExtension))) ||
@@ -4776,7 +4776,7 @@ class DocumentManager
                         $url = $documentWebPath.$url_path;
                     }
 
-                    if ($visibility == false) {
+                    if (false == $visibility) {
                         $class = ' ajax text-muted ';
                         if ($addToEditor) {
                             $class = ' text-muted not_select_to_ckeditor';
@@ -4798,7 +4798,7 @@ class DocumentManager
                 } else {
                     // For a "PDF Download" of the file.
                     $pdfPreview = null;
-                    if ($ext != 'pdf' && !in_array($ext, $webODFList)) {
+                    if ('pdf' != $ext && !in_array($ext, $webODFList)) {
                         $url = $basePageUrl.'showinframes.php?'.$courseParams.'&id='.$document_data['id'];
                     } else {
                         $pdfPreview = Display::url(
@@ -4819,10 +4819,10 @@ class DocumentManager
             $urlDecoded = urldecode($checkExtension);
             // Icon column
             if (preg_match('/shared_folder/', $urlDecoded) &&
-                preg_match('/shared_folder$/', $urlDecoded) == false &&
-                preg_match('/shared_folder_session_'.$sessionId.'$/', urldecode($url)) == false
+                false == preg_match('/shared_folder$/', $urlDecoded) &&
+                false == preg_match('/shared_folder_session_'.$sessionId.'$/', urldecode($url))
             ) {
-                if ($filetype === 'file') {
+                if ('file' === $filetype) {
                     // Sound preview
                     if (preg_match('/mp3$/i', $urlDecoded) ||
                         preg_match('/wav$/i', $urlDecoded) ||
@@ -4860,7 +4860,7 @@ class DocumentManager
                     '</a>';
                 }
             } else {
-                if ($filetype === 'file') {
+                if ('file' === $filetype) {
                     // Sound preview with jplayer
                     if (preg_match('/mp3$/i', $urlDecoded) ||
                         (preg_match('/wav$/i', $urlDecoded)) ||
@@ -4915,14 +4915,14 @@ class DocumentManager
             $isAllowedToEdit = api_is_allowed_to_edit(null, true);
         }
         $user_image = false;
-        if ($type == 'file') {
+        if ('file' == $type) {
             $icon = choose_image($basename);
             $basename = substr(strrchr($basename, '.'), 1);
-        } elseif ($type == 'link') {
+        } elseif ('link' == $type) {
             $icon = 'clouddoc.png';
             $basename = get_lang('Cloud file link');
         } else {
-            if ($path == '/shared_folder') {
+            if ('/shared_folder' == $path) {
                 $icon = 'folder_users.png';
                 if ($isAllowedToEdit) {
                     $basename = get_lang('INFORMATION VISIBLE TO THE TEACHER ONLY:
@@ -4947,7 +4947,7 @@ The users folder contains a folder for each user who has accessed it through the
             } else {
                 $icon = 'folder_document.png';
 
-                if ($path == '/audio') {
+                if ('/audio' == $path) {
                     $icon = 'folder_audio.png';
                     if ($isAllowedToEdit) {
                         $basename = get_lang('INFORMATION VISIBLE TO THE TEACHER ONLY:
@@ -4955,7 +4955,7 @@ This folder contains the default archives. You can clear files or add new ones,
                     } else {
                         $basename = get_lang('Audio');
                     }
-                } elseif ($path == '/flash') {
+                } elseif ('/flash' == $path) {
                     $icon = 'folder_flash.png';
                     if ($isAllowedToEdit) {
                         $basename = get_lang('INFORMATION VISIBLE TO THE TEACHER ONLY:
@@ -4963,7 +4963,7 @@ This folder contains the default archives. You can clear files or add new ones,
                     } else {
                         $basename = get_lang('Flash');
                     }
-                } elseif ($path == '/images') {
+                } elseif ('/images' == $path) {
                     $icon = 'folder_images.png';
                     if ($isAllowedToEdit) {
                         $basename = get_lang('INFORMATION VISIBLE TO THE TEACHER ONLY:
@@ -4971,7 +4971,7 @@ This folder contains the default archives. You can clear files or add new ones,
                     } else {
                         $basename = get_lang('Images');
                     }
-                } elseif ($path == '/video') {
+                } elseif ('/video' == $path) {
                     $icon = 'folder_video.png';
                     if ($isAllowedToEdit) {
                         $basename = get_lang('INFORMATION VISIBLE TO THE TEACHER ONLY:
@@ -4979,7 +4979,7 @@ This folder contains the default archives. You can clear files or add new ones,
                     } else {
                         $basename = get_lang('Video');
                     }
-                } elseif ($path == '/images/gallery') {
+                } elseif ('/images/gallery' == $path) {
                     $icon = 'folder_gallery.png';
                     if ($isAllowedToEdit) {
                         $basename = get_lang('INFORMATION VISIBLE TO THE TEACHER ONLY:
@@ -4987,7 +4987,7 @@ This folder contains the default archives. You can clear files or add new ones,
                     } else {
                         $basename = get_lang('Gallery');
                     }
-                } elseif ($path == '/chat_files') {
+                } elseif ('/chat_files' == $path) {
                     $icon = 'folder_chat.png';
                     if ($isAllowedToEdit) {
                         $basename = get_lang('INFORMATION VISIBLE TO THE TEACHER ONLY:
@@ -4995,7 +4995,7 @@ This folder contains all sessions that have been opened in the chat. Although th
                     } else {
                         $basename = get_lang('Chat conversations history');
                     }
-                } elseif ($path == '/learning_path') {
+                } elseif ('/learning_path' == $path) {
                     $icon = 'folder_learningpath.png';
                     if ($isAllowedToEdit) {
                         $basename = get_lang('HelpFolderLearning paths');
@@ -5032,7 +5032,7 @@ This folder contains all sessions that have been opened in the chat. Although th
         $is_read_only = $document_data['readonly'];
         $path = $document_data['path'];
 
-        if ($type == 'link') {
+        if ('link' == $type) {
             $parent_id = self::get_document_id(
                 api_get_course_info(),
                 rtrim($path, '/'),
@@ -5059,7 +5059,7 @@ This folder contains all sessions that have been opened in the chat. Although th
         $curdirpath = urlencode($curdirpath);
         $extension = pathinfo($path, PATHINFO_EXTENSION);
         //@todo Implement remote support for converter
-        $usePpt2lp = api_get_setting('service_ppt2lp', 'active') == 'true' && api_get_setting('service_ppt2lp', 'host') == 'localhost';
+        $usePpt2lp = 'true' == api_get_setting('service_ppt2lp', 'active') && 'localhost' == api_get_setting('service_ppt2lp', 'host');
         $formatTypeList = self::getFormatTypeListConvertor('from', $extension);
         $formatType = current($formatTypeList);
 
@@ -5097,15 +5097,15 @@ This folder contains all sessions that have been opened in the chat. Although th
             }
         }
 
-        if ($type == 'file' && ($extension == 'html' || $extension == 'htm')) {
-            if ($is_template == 0) {
-                if ((isset($_GET['curdirpath']) && $_GET['curdirpath'] != '/certificates') || !isset($_GET['curdirpath'])) {
+        if ('file' == $type && ('html' == $extension || 'htm' == $extension)) {
+            if (0 == $is_template) {
+                if ((isset($_GET['curdirpath']) && '/certificates' != $_GET['curdirpath']) || !isset($_GET['curdirpath'])) {
                     $modify_icons[] = Display::url(
                         Display::return_icon('wizard.png', get_lang('Add as a template')),
                         api_get_self()."?$courseParams&curdirpath=$curdirpath&add_as_template=$id"
                     );
                 }
-                if ((isset($_GET['curdirpath']) && $_GET['curdirpath'] == '/certificates') || $is_certificate_mode) {//allow attach certificate to course
+                if ((isset($_GET['curdirpath']) && '/certificates' == $_GET['curdirpath']) || $is_certificate_mode) {//allow attach certificate to course
                     $visibility_icon_certificate = 'nocertificate';
                     if (self::get_default_certificate_id(api_get_course_int_id()) == $id) {
                         $visibility_icon_certificate = 'certificate';
@@ -5163,44 +5163,44 @@ This folder contains all sessions that have been opened in the chat. Although th
         $options = [];
 
         // Group documents cannot be uploaded in the root
-        if ($group_dir == '') {
-            if ($curdirpath != '/') {
+        if ('' == $group_dir) {
+            if ('/' != $curdirpath) {
                 $options['/'] = get_lang('Documents');
             }
 
             if (is_array($folders)) {
                 foreach ($folders as &$folder) {
                     // Hide some folders
-                    if ($folder == '/HotPotatoes_files' ||
-                        $folder == '/certificates' ||
-                        basename($folder) == 'css'
+                    if ('/HotPotatoes_files' == $folder ||
+                        '/certificates' == $folder ||
+                        'css' == basename($folder)
                     ) {
                         continue;
                     }
                     // Admin setting for Hide/Show the folders of all users
-                    if (api_get_setting('show_users_folders') == 'false' &&
+                    if ('false' == api_get_setting('show_users_folders') &&
                         (strstr($folder, '/shared_folder') || strstr($folder, 'shared_folder_session_'))
                     ) {
                         continue;
                     }
 
                     // Admin setting for Hide/Show Default folders to all users
-                    if (api_get_setting('show_default_folders') == 'false' &&
+                    if ('false' == api_get_setting('show_default_folders') &&
                         (
-                            $folder == '/images' ||
-                            $folder == '/flash' ||
-                            $folder == '/audio' ||
-                            $folder == '/video' ||
+                            '/images' == $folder ||
+                            '/flash' == $folder ||
+                            '/audio' == $folder ||
+                            '/video' == $folder ||
                             strstr($folder, '/images/gallery') ||
-                            $folder == '/video/flv'
+                            '/video/flv' == $folder
                         )
                     ) {
                         continue;
                     }
 
                     // Admin setting for Hide/Show chat history folder
-                    if (api_get_setting('show_chat_folder') == 'false' &&
-                        $folder == '/chat_files') {
+                    if ('false' == api_get_setting('show_chat_folder') &&
+                        '/chat_files' == $folder) {
                         continue;
                     }
 
@@ -5230,7 +5230,7 @@ This folder contains all sessions that have been opened in the chat. Although th
                     // Cannot copy dir into his own subdir
                     $path_displayed = self::get_titles_of_path($folder);
                     $display_folder = substr($path_displayed, strlen($group_dir));
-                    $display_folder = $display_folder == '' ? get_lang('Documents') : $display_folder;
+                    $display_folder = '' == $display_folder ? get_lang('Documents') : $display_folder;
                     $options[$folder] = $display_folder;
                 }
             }
@@ -5311,7 +5311,7 @@ This folder contains all sessions that have been opened in the chat. Although th
     public static function is_shared_folder($curdirpath, $sessionId)
     {
         $clean_curdirpath = Security::remove_XSS($curdirpath);
-        if ($clean_curdirpath == '/shared_folder') {
+        if ('/shared_folder' == $clean_curdirpath) {
             return true;
         } elseif ($clean_curdirpath == '/shared_folder_session_'.$sessionId) {
             return true;
@@ -5464,7 +5464,7 @@ This folder contains all sessions that have been opened in the chat. Although th
      */
     public static function search_keyword($document_name, $keyword)
     {
-        if (api_strripos($document_name, $keyword) !== false) {
+        if (false !== api_strripos($document_name, $keyword)) {
             return true;
         } else {
             return false;
@@ -5505,37 +5505,37 @@ This folder contains all sessions that have been opened in the chat. Although th
         }
 
         //check native support (Explorer, Opera, Firefox, Chrome, Safari)
-        if ($file_extension == "pdf") {
+        if ("pdf" == $file_extension) {
             return api_browser_support('pdf');
-        } elseif ($file_extension == "mp3") {
+        } elseif ("mp3" == $file_extension) {
             return api_browser_support('mp3');
-        } elseif ($file_extension == "mp4") {
+        } elseif ("mp4" == $file_extension) {
             return api_browser_support('mp4');
-        } elseif ($file_extension == "ogg" || $file_extension == "ogx" || $file_extension == "ogv" || $file_extension == "oga") {
+        } elseif ("ogg" == $file_extension || "ogx" == $file_extension || "ogv" == $file_extension || "oga" == $file_extension) {
             return api_browser_support('ogg');
-        } elseif ($file_extension == "svg") {
+        } elseif ("svg" == $file_extension) {
             return api_browser_support('svg');
-        } elseif ($file_extension == "mpg" || $file_extension == "mpeg") {
+        } elseif ("mpg" == $file_extension || "mpeg" == $file_extension) {
             return api_browser_support('mpg');
-        } elseif ($file_extension == "mov") {
+        } elseif ("mov" == $file_extension) {
             return api_browser_support('mov');
-        } elseif ($file_extension == "wav") {
+        } elseif ("wav" == $file_extension) {
             return api_browser_support('wav');
-        } elseif ($file_extension == "mid" || $file_extension == "kar") {
+        } elseif ("mid" == $file_extension || "kar" == $file_extension) {
             return api_browser_support('mid');
-        } elseif ($file_extension == "avi") {
+        } elseif ("avi" == $file_extension) {
             return api_browser_support('avi');
-        } elseif ($file_extension == "wma") {
+        } elseif ("wma" == $file_extension) {
             return api_browser_support('wma');
-        } elseif ($file_extension == "wmv") {
+        } elseif ("wmv" == $file_extension) {
             return api_browser_support('wmv');
-        } elseif ($file_extension == "tif" || $file_extension == "tiff") {
+        } elseif ("tif" == $file_extension || "tiff" == $file_extension) {
             return api_browser_support('tif');
-        } elseif ($file_extension == "mov") {
+        } elseif ("mov" == $file_extension) {
             return api_browser_support('mov');
-        } elseif ($file_extension == "au") {
+        } elseif ("au" == $file_extension) {
             return api_browser_support('au');
-        } elseif ($file_extension == "webm") {
+        } elseif ("webm" == $file_extension) {
             return api_browser_support('webm');
         }
 
@@ -5773,7 +5773,7 @@ This folder contains all sessions that have been opened in the chat. Although th
                 Database::query($query);
                 break;
             case 'update':
-                if ($new_path[0] == '.') {
+                if ('.' == $new_path[0]) {
                     $new_path = substr($new_path, 1);
                 }
                 $new_path = str_replace('//', '/', $new_path);
@@ -5815,7 +5815,7 @@ This folder contains all sessions that have been opened in the chat. Although th
         // Modifications by Ivan Tcholakov, 04-MAY-2009.
         $result = [];
         $imageResize = Session::read('image_resizing');
-        if ($imageResize == 'resizing' || $slideshow == 1) {
+        if ('resizing' == $imageResize || 1 == $slideshow) {
             $new_sizes = api_resize_image($image, $target_width, $target_height);
             $result[] = $new_sizes['height'];
             $result[] = $new_sizes['width'];
@@ -5906,7 +5906,7 @@ This folder contains all sessions that have been opened in the chat. Although th
         $courseId = (int) $courseInfo['real_id'];
         $path = Database::escape_string($path);
 
-        if (substr($path, -1) != '/') {
+        if ('/' != substr($path, -1)) {
             // Add final slash to path if not present
             $path .= '/';
         }
@@ -6021,7 +6021,7 @@ This folder contains all sessions that have been opened in the chat. Although th
         $result = Database::query($sql);
 
         $list = [];
-        if (Database::num_rows($result) != 0) {
+        if (0 != Database::num_rows($result)) {
             while ($row = Database::fetch_array($result, 'ASSOC')) {
                 $row['code_path'] = $row['code'].':'.$row['path'];
                 $list[] = $row;
@@ -6053,7 +6053,7 @@ This folder contains all sessions that have been opened in the chat. Although th
         $title = $document->getTitle();
 
         // Only create a ResourceFile if there's a file involved
-        if ($fileType === 'file') {
+        if ('file' === $fileType) {
             $resourceFile = $resourceNode->getResourceFile();
             if (empty($resourceFile)) {
                 $resourceFile = new ResourceFile();
@@ -6293,11 +6293,11 @@ This folder contains all sessions that have been opened in the chat. Although th
                 false,
                 $userIsSubscribed
             );
-            $invisibility_span_open = $is_visible == 0 ? '<span class="muted">' : '';
-            $invisibility_span_close = $is_visible == 0 ? '</span>' : '';
+            $invisibility_span_open = 0 == $is_visible ? '<span class="muted">' : '';
+            $invisibility_span_close = 0 == $is_visible ? '</span>' : '';
             $size = 1;
             // Get the title or the basename depending on what we're using
-            if ($document_data['title'] != '') {
+            if ('' != $document_data['title']) {
                 $document_name = $document_data['title'];
             } else {
                 $document_name = basename($document_data['path']);
@@ -6331,7 +6331,7 @@ This folder contains all sessions that have been opened in the chat. Although th
             }
 
             // Hack in order to avoid the download icon appearing on cloud links
-            if ($document_data['filetype'] == 'link') {
+            if ('link' == $document_data['filetype']) {
                 $size = 0;
             }
 
@@ -6368,7 +6368,7 @@ This folder contains all sessions that have been opened in the chat. Although th
                 .nl2br(htmlspecialchars($document_data['comment'], ENT_QUOTES, 'utf-8'))
                 .'</i>'.$invisibility_span_close.$user_link;
 
-            if ($document_data['filetype'] == 'folder') {
+            if ('folder' == $document_data['filetype']) {
                 $displaySize = '<span id="document_size_'.$document_data['id']
                     .'" data-path= "'.$document_data['path']
                     .'" class="document_size"></span>';
@@ -6518,12 +6518,12 @@ This folder contains all sessions that have been opened in the chat. Although th
         );
 
         $visibilityClass = null;
-        if ($visibility == 0) {
+        if (0 == $visibility) {
             $visibilityClass = ' text-muted ';
         }
         $return = null;
 
-        if ($lp_id == false) {
+        if (false == $lp_id) {
             $return .= '<li class="doc_resource '.$visibilityClass.' " data_id="'.$documentId.'" data_type="document" title="'.$my_file_title.'" >';
         } else {
             $return .= '<li class="doc_resource lp_resource_element '.$visibilityClass.' " data_id="'.$documentId.'" data_type="document" title="'.$my_file_title.'" >';
@@ -6581,7 +6581,7 @@ This folder contains all sessions that have been opened in the chat. Although th
         // if in LP, hidden folder are displayed in grey
         $folder_class_hidden = '';
         if ($lp_id) {
-            if (isset($resource['visible']) && $resource['visible'] == 0) {
+            if (isset($resource['visible']) && 0 == $resource['visible']) {
                 $folder_class_hidden = ' doc_folder_hidden'; // in base.css
             }
         }
@@ -6604,7 +6604,7 @@ This folder contains all sessions that have been opened in the chat. Although th
         $return .= '</li>';
 
         if (empty($path)) {
-            if ($folderId == false) {
+            if (false == $folderId) {
                 $return .= '<div id="res_'.$resource['id'].'" >';
             } else {
                 $return .= '<div id="res_'.$resource['id'].'" style="display: none;" >';
@@ -6639,22 +6639,22 @@ This folder contains all sessions that have been opened in the chat. Although th
             }
 
             if (
-                $extension == 'svg' && api_browser_support('svg') &&
-                api_get_setting('enabled_support_svg') == 'true'
+                'svg' == $extension && api_browser_support('svg') &&
+                'true' == api_get_setting('enabled_support_svg')
             ) {
                 return Display::url($iconEn, "edit_draw.php?$courseParams&id=$documentId");
             }
 
             if (
                 in_array($extension, $webOdfExtensionList) &&
-                api_get_configuration_value('enabled_support_odf') === true
+                true === api_get_configuration_value('enabled_support_odf')
             ) {
                 return Display::url($iconEn, "edit_odf.php?$courseParams&id=$documentId");
             }
 
             if (
                 in_array($extension, ['png', 'jpg', 'jpeg', 'bmp', 'gif', 'pxd']) &&
-                    api_get_setting('enabled_support_pixlr') == 'true'
+                    'true' == api_get_setting('enabled_support_pixlr')
             ) {
                 return Display::url($iconEn, "edit_paint.php?$courseParams&id=$documentId");
             }
@@ -6677,22 +6677,22 @@ This folder contains all sessions that have been opened in the chat. Although th
         }
 
         if (
-            $extension == 'svg' && api_browser_support('svg') &&
-            api_get_setting('enabled_support_svg') == 'true'
+            'svg' == $extension && api_browser_support('svg') &&
+            'true' == api_get_setting('enabled_support_svg')
         ) {
             return Display::url($iconEn, "edit_draw.php?$courseParams&id=$documentId");
         }
 
         if (
             in_array($extension, $webOdfExtensionList) &&
-            api_get_configuration_value('enabled_support_odf') === true
+            true === api_get_configuration_value('enabled_support_odf')
         ) {
             return Display::url($iconEn, "edit_odf.php?$courseParams&id=$documentId");
         }
 
         if (
             in_array($extension, ['png', 'jpg', 'jpeg', 'bmp', 'gif', 'pxd']) &&
-                api_get_setting('enabled_support_pixlr') == 'true'
+                'true' == api_get_setting('enabled_support_pixlr')
         ) {
             return Display::url($iconEn, "edit_paint.php?$courseParams&id=$documentId");
         }
@@ -6758,8 +6758,8 @@ This folder contains all sessions that have been opened in the chat. Although th
         $isCertificateMode,
         $parentId
     ) {
-        $visibility_icon = $visibility == 0 ? 'invisible' : 'visible';
-        $visibility_command = $visibility == 0 ? 'set_visible' : 'set_invisible';
+        $visibility_icon = 0 == $visibility ? 'invisible' : 'visible';
+        $visibility_command = 0 == $visibility ? 'set_visible' : 'set_invisible';
         $courseParams = api_get_cidreq();
 
         if ($isReadOnly) {
@@ -6775,7 +6775,7 @@ This folder contains all sessions that have been opened in the chat. Although th
         }
 
         if (api_is_allowed_to_edit() || api_is_platform_admin()) {
-            $tip_visibility = $visibility_icon == 'invisible' ? get_lang('Show') : get_lang('Hide');
+            $tip_visibility = 'invisible' == $visibility_icon ? get_lang('Show') : get_lang('Hide');
 
             return Display::url(
                 Display::return_icon($visibility_icon.'.png', $tip_visibility),
@@ -6836,7 +6836,7 @@ This folder contains all sessions that have been opened in the chat. Although th
 
         if (
             isset($_GET['curdirpath']) &&
-            $_GET['curdirpath'] == '/certificates' &&
+            '/certificates' == $_GET['curdirpath'] &&
             self::get_default_certificate_id(api_get_course_int_id()) == $id
         ) {
             return $btn;
diff --git a/public/main/inc/lib/elfinder/connectorAction.php b/public/main/inc/lib/elfinder/connectorAction.php
index ec11b0192f..486faef308 100644
--- a/public/main/inc/lib/elfinder/connectorAction.php
+++ b/public/main/inc/lib/elfinder/connectorAction.php
@@ -24,7 +24,7 @@ if (empty($driverList)) {
     $newDriverList = [];
     if ($block && !api_is_allowed_to_edit()) {
         foreach ($driverList as $driver) {
-            if ($driver === 'CourseDriver') {
+            if ('CourseDriver' === $driver) {
                 continue;
             }
             $newDriverList[] = $driver;
diff --git a/public/main/inc/lib/events.lib.php b/public/main/inc/lib/events.lib.php
index 01ad7723d1..da75fe3f8f 100644
--- a/public/main/inc/lib/events.lib.php
+++ b/public/main/inc/lib/events.lib.php
@@ -43,13 +43,13 @@ class Event
         Database::query($sql);
 
         $status = 'student';
-        if ($userInfo['status'] == SESSIONADMIN) {
+        if (SESSIONADMIN == $userInfo['status']) {
             $status = 'sessionadmin';
         }
-        if ($userInfo['status'] == COURSEMANAGER) {
+        if (COURSEMANAGER == $userInfo['status']) {
             $status = 'teacher';
         }
-        if ($userInfo['status'] == DRH) {
+        if (DRH == $userInfo['status']) {
             $status = 'DRH';
         }
 
@@ -76,13 +76,13 @@ class Event
     {
         if (!empty($sessionId)) {
             $visibility = api_get_session_visibility($sessionId);
-            if (!empty($visibility) && $visibility != SESSION_AVAILABLE) {
+            if (!empty($visibility) && SESSION_AVAILABLE != $visibility) {
                 $extraFieldValue = new ExtraFieldValue('session');
                 $value = $extraFieldValue->get_values_by_handler_and_field_variable(
                     $sessionId,
                     'disable_log_after_session_ends'
                 );
-                if (!empty($value) && isset($value['value']) && (int) $value['value'] == 1) {
+                if (!empty($value) && isset($value['value']) && 1 == (int) $value['value']) {
                     return false;
                 }
             }
@@ -113,7 +113,7 @@ class Event
         $userId = api_get_user_id();
         $ip = Database::escape_string(api_get_real_ip());
 
-        if (self::isSessionLogNeedToBeSave($sessionId) === false) {
+        if (false === self::isSessionLogNeedToBeSave($sessionId)) {
             return false;
         }
 
@@ -136,7 +136,7 @@ class Event
                   access_session_id = $sessionId";
         $result = Database::query($sql);
 
-        if (Database::affected_rows($result) == 0) {
+        if (0 == Database::affected_rows($result)) {
             $sql = "INSERT INTO $TABLETRACK_LASTACCESS (access_user_id, c_id, access_date, access_session_id)
                     VALUES ($userId, $courseId, '$now', $sessionId)";
             Database::query($sql);
@@ -183,7 +183,7 @@ class Event
             return false;
         }
 
-        if (self::isSessionLogNeedToBeSave($sessionId) === false) {
+        if (false === self::isSessionLogNeedToBeSave($sessionId)) {
             return false;
         }
 
@@ -204,7 +204,7 @@ class Event
         $pos2 = isset($_SERVER['HTTP_REFERER']) ? strpos(strtolower($_SERVER['HTTP_REFERER']), strtolower(api_get_path(WEB_PATH)."index")) : false;
 
         // end "what's new" notification
-        if ($pos !== false || $pos2 !== false) {
+        if (false !== $pos || false !== $pos2) {
             $params = [
                 'access_user_id' => $userId,
                 'c_id' => $courseId,
@@ -226,7 +226,7 @@ class Event
                     access_session_id = $sessionId";
         $result = Database::query($sql);
 
-        if (Database::affected_rows($result) == 0) {
+        if (0 == Database::affected_rows($result)) {
             $params = [
                 'access_user_id' => $userId,
                 'c_id' => $courseId,
@@ -590,7 +590,7 @@ class Event
                 if ($debug) {
                     error_log("Attempt already exist: exe_id: $exe_id - user_id:$user_id - question_id:$question_id");
                 }
-                if ($updateResults == false) {
+                if (false == $updateResults) {
                     //The attempt already exist do not update use  update_event_exercise() instead
                     return false;
                 }
@@ -606,7 +606,7 @@ class Event
 
             $recording_table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT_RECORDING);
 
-            if ($updateResults == false) {
+            if (false == $updateResults) {
                 $attempt_id = Database::insert($TBL_TRACK_ATTEMPT, $attempt);
 
                 if ($debug) {
@@ -698,7 +698,7 @@ class Event
         $debug = false;
         global $safe_lp_id, $safe_lp_item_id;
 
-        if ($updateResults == false) {
+        if (false == $updateResults) {
             // Validation in case of fraud with activated control time
             if (!ExerciseLib::exercise_time_control_is_valid($exerciseId, $safe_lp_id, $safe_lp_item_id)) {
                 if ($debug) {
@@ -801,7 +801,7 @@ class Event
         }
 
         //Clean the user_info
-        if ($event_value_type == LOG_USER_OBJECT) {
+        if (LOG_USER_OBJECT == $event_value_type) {
             if (is_array($event_value)) {
                 unset($event_value['complete_name']);
                 unset($event_value['complete_name_with_username']);
@@ -1842,7 +1842,7 @@ class Event
         }
 
         $sessionId = (int) $sessionId;
-        if (self::isSessionLogNeedToBeSave($sessionId) === false) {
+        if (false === self::isSessionLogNeedToBeSave($sessionId)) {
             return false;
         }
 
@@ -1901,7 +1901,7 @@ class Event
 
         $sessionId = (int) $sessionId;
 
-        if (self::isSessionLogNeedToBeSave($sessionId) === false) {
+        if (false === self::isSessionLogNeedToBeSave($sessionId)) {
             return false;
         }
 
@@ -1981,7 +1981,7 @@ class Event
                 $sessionId = (int) $logoutInfo['sid'];
             }
 
-            if (self::isSessionLogNeedToBeSave($sessionId) === false) {
+            if (false === self::isSessionLogNeedToBeSave($sessionId)) {
                 return false;
             }
 
@@ -2165,11 +2165,11 @@ class Event
             return false;
         }
 
-        if (self::isSessionLogNeedToBeSave($sessionId) === false) {
+        if (false === self::isSessionLogNeedToBeSave($sessionId)) {
             return false;
         }
 
-        $loginAs = (int) Session::read('login_as') === true;
+        $loginAs = true === (int) Session::read('login_as');
 
         $logInfo['user_id'] = api_get_user_id();
         $logInfo['date_reg'] = api_get_utc_datetime();
diff --git a/public/main/inc/lib/exercise.lib.php b/public/main/inc/lib/exercise.lib.php
index 660c26cc50..42fba087db 100644
--- a/public/main/inc/lib/exercise.lib.php
+++ b/public/main/inc/lib/exercise.lib.php
@@ -64,15 +64,15 @@ class ExerciseLib
             return false;
         }
 
-        if ($exercise->getFeedbackType() != EXERCISE_FEEDBACK_TYPE_END) {
+        if (EXERCISE_FEEDBACK_TYPE_END != $exercise->getFeedbackType()) {
             $show_comment = false;
         }
 
         $answerType = $objQuestionTmp->selectType();
         $s = '';
-        if ($answerType != HOT_SPOT &&
-            $answerType != HOT_SPOT_DELINEATION &&
-            $answerType != ANNOTATION
+        if (HOT_SPOT != $answerType &&
+            HOT_SPOT_DELINEATION != $answerType &&
+            ANNOTATION != $answerType
         ) {
             // Question is not a hotspot
             if (!$only_questions) {
@@ -82,7 +82,7 @@ class ExerciseLib
                         TestCategory::displayCategoryAndTitle($objQuestionTmp->id);
                     }
                     $titleToDisplay = $objQuestionTmp->getTitleToDisplay($current_item);
-                    if ($answerType == READING_COMPREHENSION) {
+                    if (READING_COMPREHENSION == $answerType) {
                         // In READING_COMPREHENSION, the title of the question
                         // contains the question itself, which can only be
                         // shown at the end of the given time, so hide for now
@@ -93,7 +93,7 @@ class ExerciseLib
                     }
                     echo $titleToDisplay;
                 }
-                if (!empty($questionDescription) && $answerType != READING_COMPREHENSION) {
+                if (!empty($questionDescription) && READING_COMPREHENSION != $answerType) {
                     echo Display::div(
                         $questionDescription,
                         ['class' => 'question_description']
@@ -125,8 +125,8 @@ class ExerciseLib
                 case MATCHING:
                 case DRAGGABLE:
                 case MATCHING_DRAGGABLE:
-                    if ($answerType == DRAGGABLE) {
-                        $isVertical = $objQuestionTmp->extra == 'v';
+                    if (DRAGGABLE == $answerType) {
+                        $isVertical = 'v' == $objQuestionTmp->extra;
                         $s .= '
                             <div class="col-md-12 ui-widget ui-helper-clearfix">
                                 <div class="clearfix">
@@ -147,7 +147,7 @@ class ExerciseLib
                     for ($answerId = 1; $answerId <= $nbrAnswers; $answerId++) {
                         $answerCorrect = $objAnswerTmp->isCorrect($answerId);
                         $numAnswer = $objAnswerTmp->selectAutoId($answerId);
-                        if ($answerCorrect == 0) {
+                        if (0 == $answerCorrect) {
                             // options (A, B, C, ...) that will be put into the list-box
                             // have the "correct" field set to 0 because they are answer
                             $cpt1[$x] = $letter;
@@ -198,7 +198,7 @@ class ExerciseLib
                     break;
                 case ORAL_EXPRESSION:
                     // Add nanog
-                    if (api_get_setting('enable_record_audio') === 'true') {
+                    if ('true' === api_get_setting('enable_record_audio')) {
                         //@todo pass this as a parameter
                         global $exercise_stat_info;
                         if (!empty($exercise_stat_info)) {
@@ -239,12 +239,12 @@ class ExerciseLib
             // Now navigate through the possible answers, using the max number of
             // answers for the question as a limiter
             $lines_count = 1; // a counter for matching-type answers
-            if ($answerType == MULTIPLE_ANSWER_TRUE_FALSE ||
-                $answerType == MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE
+            if (MULTIPLE_ANSWER_TRUE_FALSE == $answerType ||
+                MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE == $answerType
             ) {
                 $header = Display::tag('th', get_lang('Options'));
                 foreach ($objQuestionTmp->options as $item) {
-                    if ($answerType == MULTIPLE_ANSWER_TRUE_FALSE) {
+                    if (MULTIPLE_ANSWER_TRUE_FALSE == $answerType) {
                         if (in_array($item, $objQuestionTmp->options)) {
                             $header .= Display::tag('th', get_lang($item));
                         } else {
@@ -263,7 +263,7 @@ class ExerciseLib
                     $header,
                     ['style' => 'text-align:left;']
                 );
-            } elseif ($answerType == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
+            } elseif (MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY == $answerType) {
                 $header = Display::tag('th', get_lang('Options'), ['width' => '50%']);
                 echo "
                 <script>
@@ -348,10 +348,10 @@ class ExerciseLib
                 foreach ($objQuestionTmp->optionsTitle as $item) {
                     if (in_array($item, $objQuestionTmp->optionsTitle)) {
                         $properties = [];
-                        if ($item === 'Answers') {
+                        if ('Answers' === $item) {
                             $properties['colspan'] = 2;
                             $properties['style'] = 'background-color: #F56B2A; color: #ffffff;';
-                        } elseif ($item == 'DegreeOfCertaintyThatMyAnswerIsCorrect') {
+                        } elseif ('DegreeOfCertaintyThatMyAnswerIsCorrect' == $item) {
                             $properties['colspan'] = 6;
                             $properties['style'] = 'background-color: #330066; color: #ffffff;';
                         }
@@ -374,7 +374,7 @@ class ExerciseLib
                 foreach ($objQuestionTmp->options as $item) {
                     $colorBorder1 = ($cpt1 == (count($objQuestionTmp->options) - 1))
                         ? '' : 'border-right: solid #FFFFFF 1px;';
-                    if ($item === 'True' || $item === 'False') {
+                    if ('True' === $item || 'False' === $item) {
                         $header1 .= Display::tag(
                             'th',
                             get_lang($item),
@@ -407,7 +407,7 @@ class ExerciseLib
                 ];
                 $counter2 = 0;
                 foreach ($objQuestionTmp->options as $item) {
-                    if ($item == 'True' || $item == 'False') {
+                    if ('True' == $item || 'False' == $item) {
                         $header2 .= Display::tag('td',
                             '&nbsp;',
                             ['style' => 'background-color: #F7E1D7; color: black;border-right: solid #FFFFFF 1px;']);
@@ -441,7 +441,7 @@ class ExerciseLib
                     ]
                 )) {
                     $header = Display::tag('th', get_lang('Options'));
-                    if ($exercise->getFeedbackType() == EXERCISE_FEEDBACK_TYPE_END) {
+                    if (EXERCISE_FEEDBACK_TYPE_END == $exercise->getFeedbackType()) {
                         $header .= Display::tag('th', get_lang('Feedback'));
                     }
                     $s .= '<table class="table table-hover table-striped">';
@@ -462,7 +462,7 @@ class ExerciseLib
             }
 
             $hidingClass = '';
-            if ($answerType == READING_COMPREHENSION) {
+            if (READING_COMPREHENSION == $answerType) {
                 $objQuestionTmp->setExerciseType($exercise->selectType());
                 $objQuestionTmp->processText($objQuestionTmp->selectDescription());
                 $hidingClass = 'hide-reading-answers';
@@ -506,7 +506,7 @@ class ExerciseLib
                             $s .= '<tr><td>';
                         }
 
-                        if ($answerType == UNIQUE_ANSWER_IMAGE) {
+                        if (UNIQUE_ANSWER_IMAGE == $answerType) {
                             if ($show_comment) {
                                 if (empty($comment)) {
                                     $s .= '<div id="answer'.$questionId.$numAnswer.'"
@@ -532,7 +532,7 @@ class ExerciseLib
 
                         $answer_input = null;
                         $attributes['class'] = 'checkradios';
-                        if ($answerType == UNIQUE_ANSWER_IMAGE) {
+                        if (UNIQUE_ANSWER_IMAGE == $answerType) {
                             $attributes['class'] = '';
                             $attributes['style'] = 'display: none;';
                             $answer = '<div class="thumbnail">'.$answer.'</div>';
@@ -548,7 +548,7 @@ class ExerciseLib
                         $answer_input .= $answer;
                         $answer_input .= '</label>';
 
-                        if ($answerType == UNIQUE_ANSWER_IMAGE) {
+                        if (UNIQUE_ANSWER_IMAGE == $answerType) {
                             $answer_input .= "</div>";
                         }
 
@@ -587,7 +587,7 @@ class ExerciseLib
                             }
                         }
 
-                        if ($answerType == MULTIPLE_ANSWER || $answerType == GLOBAL_MULTIPLE_ANSWER) {
+                        if (MULTIPLE_ANSWER == $answerType || GLOBAL_MULTIPLE_ANSWER == $answerType) {
                             $s .= '<input type="hidden" name="choice2['.$questionId.']" value="0" />';
                             $attributes['class'] = 'checkradios';
                             $answer_input = '<label class="checkbox">';
@@ -611,7 +611,7 @@ class ExerciseLib
                             } else {
                                 $s .= $answer_input;
                             }
-                        } elseif ($answerType == MULTIPLE_ANSWER_TRUE_FALSE) {
+                        } elseif (MULTIPLE_ANSWER_TRUE_FALSE == $answerType) {
                             $myChoice = [];
                             if (!empty($userChoiceList)) {
                                 foreach ($userChoiceList as $item) {
@@ -661,7 +661,7 @@ class ExerciseLib
                                 $s .= '</td>';
                             }
                             $s .= '</tr>';
-                        } elseif ($answerType == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
+                        } elseif (MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY == $answerType) {
                             $myChoice = [];
                             if (!empty($userChoiceList)) {
                                 foreach ($userChoiceList as $item) {
@@ -706,7 +706,7 @@ class ExerciseLib
                                         }
                                     }
 
-                                    if ($item['name'] == 'True' || $item['name'] == 'False') {
+                                    if ('True' == $item['name'] || 'False' == $item['name']) {
                                         $s .= Display::tag('td',
                                             Display::input('radio',
                                                 'choice['.$questionId.']['.$numAnswer.']',
@@ -922,7 +922,7 @@ class ExerciseLib
                          * the text to find mustn't contains HTML tags
                          * the text to find mustn't contains char "
                          */
-                        if ($origin !== null) {
+                        if (null !== $origin) {
                             global $exe_id;
                             $exe_id = (int) $exe_id;
                             $trackAttempts = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
@@ -1036,7 +1036,7 @@ class ExerciseLib
                             foreach ($correctAnswerList[0] as $item) {
                                 $size = strlen($item);
                                 $attributes['class'] = self::detectInputAppropriateClass($size);
-                                if ($exercise->getFeedbackType() == EXERCISE_FEEDBACK_TYPE_POPUP) {
+                                if (EXERCISE_FEEDBACK_TYPE_POPUP == $exercise->getFeedbackType()) {
                                     $attributes['id'] = "question_$questionId";
                                     $attributes['class'] .= ' checkCalculatedQuestionOnEnter ';
                                 }
@@ -1053,7 +1053,7 @@ class ExerciseLib
                                 );
                             }
                         }
-                        if ($origin !== null) {
+                        if (null !== $origin) {
                             $s = $answer;
                             break;
                         } else {
@@ -1063,7 +1063,7 @@ class ExerciseLib
                     case MATCHING:
                         // matching type, showing suggestions and answers
                         // TODO: replace $answerId by $numAnswer
-                        if ($answerCorrect != 0) {
+                        if (0 != $answerCorrect) {
                             // only show elements to be answered (not the contents of
                             // the select boxes, who are correct = 0)
                             $s .= '<tr><td width="45%" valign="top">';
@@ -1219,10 +1219,10 @@ class ExerciseLib
                         }
                         break;
                     case MATCHING_DRAGGABLE:
-                        if ($answerId == 1) {
+                        if (1 == $answerId) {
                             echo $objAnswerTmp->getJs();
                         }
-                        if ($answerCorrect != 0) {
+                        if (0 != $answerCorrect) {
                             $windowId = "{$questionId}_{$lines_count}";
                             $s .= <<<HTML
                             <tr>
@@ -1346,8 +1346,8 @@ HTML;
                 $s .= '</table>';
             }
 
-            if ($answerType == DRAGGABLE) {
-                $isVertical = $objQuestionTmp->extra == 'v';
+            if (DRAGGABLE == $answerType) {
+                $isVertical = 'v' == $objQuestionTmp->extra;
                 $s .= "</ul>";
                 $s .= "</div>";
                 $counterAnswer = 1;
@@ -1384,11 +1384,11 @@ HTML;
             unset($objAnswerTmp);
             // destruction of the Question object
             unset($objQuestionTmp);
-            if ($origin == 'export') {
+            if ('export' == $origin) {
                 return $s;
             }
             echo $s;
-        } elseif ($answerType == HOT_SPOT || $answerType == HOT_SPOT_DELINEATION) {
+        } elseif (HOT_SPOT == $answerType || HOT_SPOT_DELINEATION == $answerType) {
             global $exe_id;
             $questionDescription = $objQuestionTmp->selectDescription();
             // Get the answers, make a list
@@ -1408,7 +1408,7 @@ HTML;
 
             $answerList = '';
             $hotspotColor = 0;
-            if ($answerType != HOT_SPOT_DELINEATION) {
+            if (HOT_SPOT_DELINEATION != $answerType) {
                 $answerList = '
                     <div class="well well-sm">
                         <h5 class="page-header">'.get_lang('Image zones').'</h5>
@@ -1445,7 +1445,7 @@ HTML;
                             </div>
                         </div>
                         <script>
-                            new ".($answerType == HOT_SPOT ? "HotspotQuestion" : "DelineationQuestion")."({
+                            new ".(HOT_SPOT == $answerType ? "HotspotQuestion" : "DelineationQuestion")."({
                                 questionId: $questionId,
                                 exerciseId: $exerciseId,
                                 exeId: 0,
@@ -1481,7 +1481,7 @@ HOTSPOT;
                    <div class=\"hotspot-image\"></div>
                     <script>
                         $(function() {
-                            new ".($answerType == HOT_SPOT_DELINEATION ? 'DelineationQuestion' : 'HotspotQuestion')."({
+                            new ".(HOT_SPOT_DELINEATION == $answerType ? 'DelineationQuestion' : 'HotspotQuestion')."({
                                 questionId: $questionId,
                                 exerciseId: $exerciseId,
                                 selector: '#question_div_' + $questionId + ' .hotspot-image',
@@ -1501,7 +1501,7 @@ HOTSPOT;
                         </div>
                     </div>
 HOTSPOT;
-        } elseif ($answerType == ANNOTATION) {
+        } elseif (ANNOTATION == $answerType) {
             global $exe_id;
             $relPath = api_get_path(WEB_CODE_PATH);
             if (api_is_platform_admin() || api_is_course_admin()) {
@@ -2056,7 +2056,7 @@ HOTSPOT;
         if (is_array($results)) {
             $users_array_id = [];
             $from_gradebook = false;
-            if (isset($_GET['gradebook']) && $_GET['gradebook'] == 'view') {
+            if (isset($_GET['gradebook']) && 'view' == $_GET['gradebook']) {
                 $from_gradebook = true;
             }
             $sizeof = count($results);
@@ -2069,13 +2069,13 @@ HOTSPOT;
             // Looping results
             for ($i = 0; $i < $sizeof; $i++) {
                 $revised = $results[$i]['revised'];
-                if ($results[$i]['completion_status'] == 'incomplete') {
+                if ('incomplete' == $results[$i]['completion_status']) {
                     // If the exercise was incomplete, we need to determine
                     // if it is still into the time allowed, or if its
                     // allowed time has expired and it can be closed
                     // (it's "unclosed")
                     $minutes = $results[$i]['expired_time'];
-                    if ($minutes == 0) {
+                    if (0 == $minutes) {
                         // There's no time limit, so obviously the attempt
                         // can still be "ongoing", but the teacher should
                         // be able to choose to close it, so mark it as
@@ -2146,7 +2146,7 @@ HOTSPOT;
                 if (isset($results[$i]['results_disabled'])) {
                     $result_disabled = (int) $results[$i]['results_disabled'];
                 }
-                if ($result_disabled == 0) {
+                if (0 == $result_disabled) {
                     $my_res = $results[$i]['score'];
                     $my_total = $results[$i]['max_score'];
                     $results[$i]['start_date'] = api_get_local_time($results[$i]['start_date']);
@@ -2241,7 +2241,7 @@ HOTSPOT;
                                 break;
                         }
 
-                        if ($filter == 2) {
+                        if (2 == $filter) {
                             $actions .= ' <a href="exercise_history.php?'.api_get_cidreq().'&exe_id='.$id.'">'.
                                 Display:: return_icon(
                                     'history.png',
@@ -2250,7 +2250,7 @@ HOTSPOT;
                         }
 
                         // Admin can always delete the attempt
-                        if (($locked == false || api_is_platform_admin()) && !api_is_student_boss()) {
+                        if ((false == $locked || api_is_platform_admin()) && !api_is_student_boss()) {
                             $ip = Tracking::get_ip_from_user_event(
                                 $results[$i]['exe_user_id'],
                                 api_get_utc_datetime(),
@@ -2296,7 +2296,7 @@ HOTSPOT;
                             if (api_is_session_admin()) {
                                 $delete_link = '';
                             }
-                            if ($revised == 3) {
+                            if (3 == $revised) {
                                 $delete_link = null;
                             }
                             $actions .= $delete_link;
@@ -2394,7 +2394,7 @@ HOTSPOT;
                                         }
 
                                         // No category for this question!
-                                        if ($category_was_added_for_this_test == false) {
+                                        if (false == $category_was_added_for_this_test) {
                                             if (!isset($category_list['none']['score'])) {
                                                 $category_list['none']['score'] = 0;
                                             }
@@ -2516,8 +2516,8 @@ HOTSPOT;
         $maxNote = api_get_setting('exercise_max_score');
         $minNote = api_get_setting('exercise_min_score');
 
-        if ($maxNote != '' && $minNote != '') {
-            if (!empty($weight) && intval($weight) != 0) {
+        if ('' != $maxNote && '' != $minNote) {
+            if (!empty($weight) && 0 != intval($weight)) {
                 $score = $minNote + ($maxNote - $minNote) * $score / $weight;
             } else {
                 $score = $minNote;
@@ -2565,7 +2565,7 @@ HOTSPOT;
             $weight = $result['weight'];
         }
 
-        $percentage = (100 * $score) / ($weight != 0 ? $weight : 1);
+        $percentage = (100 * $score) / (0 != $weight ? $weight : 1);
         // Formats values
         $percentage = float_format($percentage, 1);
         $score = float_format($score, 1);
@@ -2685,7 +2685,7 @@ HOTSPOT;
         $courseInfo = api_get_course_info();
         if (!empty($courseInfo)) {
             $scoreModelId = api_get_course_setting('score_model_id');
-            if ($scoreModelId != -1) {
+            if (-1 != $scoreModelId) {
                 $modelIdList = array_column($modelList['models'], 'id');
                 if (in_array($scoreModelId, $modelIdList)) {
                     foreach ($modelList['models'] as $item) {
@@ -2718,7 +2718,7 @@ HOTSPOT;
     public static function isSuccessExerciseResult($score, $weight, $pass_percentage)
     {
         $percentage = float_format(
-            ($score / ($weight != 0 ? $weight : 1)) * 100,
+            ($score / (0 != $weight ? $weight : 1)) * 100,
             1
         );
         if (isset($pass_percentage) && !empty($pass_percentage)) {
@@ -2884,7 +2884,7 @@ EOT;
     public static function convert_to_percentage($value)
     {
         $return = '-';
-        if ($value != '') {
+        if ('' != $value) {
             $return = float_format($value * 100, 1).' %';
         }
 
@@ -2922,7 +2922,7 @@ EOT;
             $course_id = $course_info['real_id'];
         }
 
-        if ($session_id == -1) {
+        if (-1 == $session_id) {
             $session_id = 0;
         }
 
@@ -2944,15 +2944,15 @@ EOT;
 
         // Show courses by active status
         $active_sql = '';
-        if ($active == 3) {
+        if (3 == $active) {
             $active_sql = ' active <> -1 AND';
         } else {
-            if ($active != 2) {
+            if (2 != $active) {
                 $active_sql = sprintf(' active = %d AND', $active);
             }
         }
 
-        if ($search_all_sessions == true) {
+        if (true == $search_all_sessions) {
             $conditions = [
                 'where' => [
                     $active_sql.' c_id = ? '.$needle_where.$timeConditions => [
@@ -3022,7 +3022,7 @@ EOT;
             $sql_active_exercises = "active IN (1, 0) AND ";
         }
 
-        if ($session_id == -1) {
+        if (-1 == $session_id) {
             $session_id = 0;
         }
 
@@ -3100,7 +3100,7 @@ EOT;
             $position = 1;
             $my_ranking = [];
             foreach ($best_attempts as $user_id => $result) {
-                if (!empty($result['max_score']) && intval($result['max_score']) != 0) {
+                if (!empty($result['max_score']) && 0 != intval($result['max_score'])) {
                     $my_ranking[$user_id] = $result['score'] / $result['max_score'];
                 } else {
                     $my_ranking[$user_id] = 0;
@@ -3183,7 +3183,7 @@ EOT;
             $position = 1;
             $my_ranking = [];
             foreach ($user_results as $result) {
-                if (!empty($result['max_score']) && intval($result['max_score']) != 0) {
+                if (!empty($result['max_score']) && 0 != intval($result['max_score'])) {
                     $my_ranking[$result['exe_id']] = $result['score'] / $result['max_score'];
                 } else {
                     $my_ranking[$result['exe_id']] = 0;
@@ -3242,7 +3242,7 @@ EOT;
         if (!empty($user_results)) {
             foreach ($user_results as $result) {
                 if (!empty($result['max_score']) &&
-                    intval($result['max_score']) != 0
+                    0 != intval($result['max_score'])
                 ) {
                     $score = $result['score'] / $result['max_score'];
                     if ($score >= $best_score) {
@@ -3283,7 +3283,7 @@ EOT;
         $best_score = 0;
         if (!empty($user_results)) {
             foreach ($user_results as $result) {
-                if (!empty($result['max_score']) && intval($result['max_score']) != 0) {
+                if (!empty($result['max_score']) && 0 != intval($result['max_score'])) {
                     $score = $result['score'] / $result['max_score'];
                     if ($score >= $best_score) {
                         $best_score = $score;
@@ -3315,7 +3315,7 @@ EOT;
         $avg_score = 0;
         if (!empty($user_results)) {
             foreach ($user_results as $result) {
-                if (!empty($result['max_score']) && intval($result['max_score']) != 0) {
+                if (!empty($result['max_score']) && 0 != intval($result['max_score'])) {
                     $score = $result['score'] / $result['max_score'];
                     $avg_score += $score;
                 }
@@ -3344,9 +3344,9 @@ EOT;
         $avg_score = 0;
         if (!empty($user_results)) {
             foreach ($user_results as $result) {
-                if (!empty($result['max_score']) && intval(
+                if (!empty($result['max_score']) && 0 != intval(
                         $result['max_score']
-                    ) != 0
+                    )
                 ) {
                     $score = $result['score'] / $result['max_score'];
                     $avg_score += $score;
@@ -3379,7 +3379,7 @@ EOT;
         $avg_score = 0;
         if (!empty($user_results)) {
             foreach ($user_results as $result) {
-                if (!empty($result['max_score']) && intval($result['max_score']) != 0) {
+                if (!empty($result['max_score']) && 0 != intval($result['max_score'])) {
                     $score = $result['score'] / $result['max_score'];
                     $avg_score += $score;
                 }
@@ -3415,7 +3415,7 @@ EOT;
         $avg_score = 0;
         if (!empty($user_results)) {
             foreach ($user_results as $result) {
-                if (!empty($result['max_score']) && intval($result['max_score']) != 0) {
+                if (!empty($result['max_score']) && 0 != intval($result['max_score'])) {
                     $score = $result['score'] / $result['max_score'];
                     $avg_score += $score;
                 }
@@ -3453,7 +3453,7 @@ EOT;
         $avg_score = 0;
         if (!empty($user_results)) {
             foreach ($user_results as $result) {
-                if (!empty($result['max_score']) && intval($result['max_score']) != 0) {
+                if (!empty($result['max_score']) && 0 != intval($result['max_score'])) {
                     $score = $result['score'] / $result['max_score'];
                     $avg_score += $score;
                 }
@@ -3576,7 +3576,7 @@ EOT;
 
         foreach ($listFillTheBlankResult as $resultCount) {
             foreach ($resultCount as $index => $count) {
-                $count = ($count === 0) ? 1 : 0;
+                $count = (0 === $count) ? 1 : 0;
                 $arrayCount[$index] += $count;
             }
         }
@@ -3613,7 +3613,7 @@ EOT;
         $courseId = api_get_course_int_id($course_code);
         $session_id = intval($session_id);
 
-        if ($questionType == FILL_IN_BLANKS) {
+        if (FILL_IN_BLANKS == $questionType) {
             $listStudentsId = [];
             $listAllStudentInfo = CourseManager::get_student_list_from_course_code(
                 api_get_course_id(),
@@ -3834,7 +3834,7 @@ EOT;
                             $row['answer'],
                             $current_answer
                         );
-                        if (isset($fill_blank[$current_answer]) && $fill_blank[$current_answer] == 1) {
+                        if (isset($fill_blank[$current_answer]) && 1 == $fill_blank[$current_answer]) {
                             $good_answers++;
                         }
                     }
@@ -3870,7 +3870,7 @@ EOT;
         $last = count($pre_array) - 1;
         $is_set_switchable = explode('@', $pre_array[$last]);
         $switchable_answer_set = false;
-        if (isset($is_set_switchable[1]) && $is_set_switchable[1] == 1) {
+        if (isset($is_set_switchable[1]) && 1 == $is_set_switchable[1]) {
             $switchable_answer_set = true;
         }
         $answer = '';
@@ -3891,7 +3891,7 @@ EOT;
         // the loop will stop at the end of the text
         while (1) {
             // quits the loop if there are no more blanks (detect '[')
-            if (($pos = api_strpos($temp, '[')) === false) {
+            if (false === ($pos = api_strpos($temp, '['))) {
                 // adds the end of the text
                 $answer = $temp;
                 $real_text[] = $answer;
@@ -3904,7 +3904,7 @@ EOT;
             //take the string remaining (after the last "[" we found)
             $temp = api_substr($temp, $pos + 1);
             // quit the loop if there are no more blanks, and update $pos to the position of next ']'
-            if (($pos = api_strpos($temp, ']')) === false) {
+            if (false === ($pos = api_strpos($temp, ']'))) {
                 // adds the end of the text
                 $answer .= $temp;
                 break;
@@ -3926,13 +3926,13 @@ EOT;
                     $choice[] = $item;
                     $i++;
                 }
-                if ($i == 3) {
+                if (3 == $i) {
                     break;
                 }
             }
             $tmp = api_strrpos($choice[$j], ' / ');
 
-            if ($tmp !== false) {
+            if (false !== $tmp) {
                 $choice[$j] = api_substr($choice[$j], 0, $tmp);
             }
 
@@ -4114,7 +4114,7 @@ EOT;
             $question_list = explode(',', $exercise_stat_info['data_tracking']);
         } else {
             // Try getting the question list only if save result is off
-            if ($save_user_result == false) {
+            if (false == $save_user_result) {
                 $question_list = $objExercise->get_validated_question_list();
             }
             if (in_array(
@@ -4126,7 +4126,7 @@ EOT;
         }
 
         if ($objExercise->getResultAccess()) {
-            if ($objExercise->hasResultsAccess($exercise_stat_info) === false) {
+            if (false === $objExercise->hasResultsAccess($exercise_stat_info)) {
                 echo Display::return_message(
                     sprintf(get_lang('YouPassedTheLimitOfXMinutesToSeeTheResults'), $objExercise->getResultsAccess())
                 );
@@ -4175,8 +4175,8 @@ EOT;
 
         // Not display expected answer, but score, and feedback
         $show_all_but_expected_answer = false;
-        if ($objExercise->results_disabled == RESULT_DISABLE_SHOW_SCORE_ONLY &&
-            $objExercise->getFeedbackType() == EXERCISE_FEEDBACK_TYPE_END
+        if (RESULT_DISABLE_SHOW_SCORE_ONLY == $objExercise->results_disabled &&
+            EXERCISE_FEEDBACK_TYPE_END == $objExercise->getFeedbackType()
         ) {
             $show_all_but_expected_answer = true;
             $show_results = true;
@@ -4224,8 +4224,8 @@ EOT;
                 }
             }
 
-            if ($objExercise->results_disabled ==
-                RESULT_DISABLE_DONT_SHOW_SCORE_ONLY_IF_USER_FINISHES_ATTEMPTS_SHOW_ALWAYS_FEEDBACK
+            if (RESULT_DISABLE_DONT_SHOW_SCORE_ONLY_IF_USER_FINISHES_ATTEMPTS_SHOW_ALWAYS_FEEDBACK ==
+                $objExercise->results_disabled
             ) {
                 $show_only_score = false;
                 $show_results = true;
@@ -4239,7 +4239,7 @@ EOT;
             }
         }
 
-        if (($show_results || $show_only_score) && $origin !== 'embeddable') {
+        if (($show_results || $show_only_score) && 'embeddable' !== $origin) {
             if (isset($exercise_stat_info['exe_user_id'])) {
                 if (!empty($studentInfo)) {
                     // Shows exercise header
@@ -4350,7 +4350,7 @@ EOT;
                 }
 
                 // No category for this question!
-                if ($category_was_added_for_this_test == false) {
+                if (false == $category_was_added_for_this_test) {
                     if (!isset($category_list['none']['score'])) {
                         $category_list['none']['score'] = 0;
                     }
@@ -4362,7 +4362,7 @@ EOT;
                     $category_list['none']['total'] += $my_total_weight;
                 }
 
-                if ($objExercise->selectPropagateNeg() == 0 && $my_total_score < 0) {
+                if (0 == $objExercise->selectPropagateNeg() && $my_total_score < 0) {
                     $my_total_score = 0;
                 }
 
@@ -4393,7 +4393,7 @@ EOT;
                     $scorePassed = $my_total_score >= $my_total_weight;
                     if (function_exists('bccomp')) {
                         $compareResult = bccomp($my_total_score, $my_total_weight, 3);
-                        $scorePassed = $compareResult === 1 || $compareResult === 0;
+                        $scorePassed = 1 === $compareResult || 0 === $compareResult;
                     }
                     $score = [
                         'result' => self::show_score(
@@ -4415,7 +4415,7 @@ EOT;
                         'comments' => Event::get_comments($exeId, $questionId),
                     ];
                     $check = $objQuestionTmp->isQuestionWaitingReview($reviewScore);
-                    if ($check === false) {
+                    if (false === $check) {
                         $countPendingQuestions++;
                     }
                 }
@@ -4424,7 +4424,7 @@ EOT;
                 $question_content = '';
                 if ($show_results) {
                     $question_content = '<div class="question_row_answer">';
-                    if ($showQuestionScore == false) {
+                    if (false == $showQuestionScore) {
                         $score = [];
                     }
 
@@ -4461,11 +4461,11 @@ EOT;
         $totalScoreText = null;
         $certificateBlock = '';
         if (($show_results || $show_only_score) && $showTotalScore) {
-            if ($result['answer_type'] == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
+            if (MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY == $result['answer_type']) {
                 echo '<h1 style="text-align : center; margin : 20px 0;">'.get_lang('Your results').'</h1><br />';
             }
             $totalScoreText .= '<div class="question_row_score">';
-            if ($result['answer_type'] == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
+            if (MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY == $result['answer_type']) {
                 $totalScoreText .= self::getQuestionDiagnosisRibbon(
                     $objExercise,
                     $total_score,
@@ -4506,7 +4506,7 @@ EOT;
             }
         }
 
-        if ($result['answer_type'] == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
+        if (MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY == $result['answer_type']) {
             $chartMultiAnswer = MultipleAnswerTrueFalseDegreeCertainty::displayStudentsChartResults(
                 $exeId,
                 $objExercise
@@ -4807,7 +4807,7 @@ EOT;
         $countPendingQuestions = 0
     ) {
         $hide = (int) $objExercise->getPageConfigurationAttribute('hide_total_score');
-        if ($hide === 1) {
+        if (1 === $hide) {
             return '';
         }
 
diff --git a/public/main/inc/lib/exercise_show_functions.lib.php b/public/main/inc/lib/exercise_show_functions.lib.php
index cf30e1d6c1..38d49d853d 100644
--- a/public/main/inc/lib/exercise_show_functions.lib.php
+++ b/public/main/inc/lib/exercise_show_functions.lib.php
@@ -134,7 +134,7 @@ class ExerciseShowFunctions
             echo '</td></tr>';
         }
 
-        if ($feedback_type != EXERCISE_FEEDBACK_TYPE_EXAM) {
+        if (EXERCISE_FEEDBACK_TYPE_EXAM != $feedback_type) {
             if ($questionScore > 0 || !empty($comments)) {
             } else {
                 echo '<tr>';
@@ -176,7 +176,7 @@ class ExerciseShowFunctions
                 echo Display::tag('td', Security::remove_XSS($answer), ['width' => '55%']);
             }
             echo '</tr>';
-            if (!$questionScore && $feedback_type != EXERCISE_FEEDBACK_TYPE_EXAM) {
+            if (!$questionScore && EXERCISE_FEEDBACK_TYPE_EXAM != $feedback_type) {
                 echo '<tr>';
                 echo Display::tag('td', ExerciseLib::getNotCorrectedYetText(), ['width' => '45%']);
                 echo '</tr>';
@@ -219,7 +219,7 @@ class ExerciseShowFunctions
         $hide_expected_answer = false;
         switch ($resultsDisabled) {
             case RESULT_DISABLE_SHOW_SCORE_ONLY:
-                if ($feedback_type == 0) {
+                if (0 == $feedback_type) {
                     $hide_expected_answer = true;
                 }
                 break;
@@ -273,7 +273,7 @@ class ExerciseShowFunctions
             $content .= $status;
         }
         $content .= '</td>';
-        if ($feedback_type != EXERCISE_FEEDBACK_TYPE_EXAM) {
+        if (EXERCISE_FEEDBACK_TYPE_EXAM != $feedback_type) {
             $content .= '<td class="text-left" width="60%">';
             if ($studentChoice) {
                 $content .= '<span style="font-weight: bold; color: #008000;">'.nl2br($answerComment).'</span>';
@@ -345,7 +345,7 @@ class ExerciseShowFunctions
                 }
                 break;
             case RESULT_DISABLE_SHOW_SCORE_ONLY:
-                if ($feedbackType == 0) {
+                if (0 == $feedbackType) {
                     $hide_expected_answer = true;
                 }
                 break;
@@ -385,7 +385,7 @@ class ExerciseShowFunctions
         echo Display::return_icon($icon, null, null, ICON_SIZE_TINY);
         echo '</td>';
         if ($exercise->showExpectedChoiceColumn()) {
-            if ($hide_expected_answer === false) {
+            if (false === $hide_expected_answer) {
                 echo '<td width="5%">';
                 echo Display::return_icon($iconAnswer, null, null, ICON_SIZE_TINY);
                 echo '</td>';
@@ -414,7 +414,7 @@ class ExerciseShowFunctions
             echo '</td>';
         }
 
-        if ($feedbackType != EXERCISE_FEEDBACK_TYPE_EXAM) {
+        if (EXERCISE_FEEDBACK_TYPE_EXAM != $feedbackType) {
             $showComment = true;
         }
 
@@ -475,7 +475,7 @@ class ExerciseShowFunctions
                 $hide_expected_answer = true;
                 break;
             case RESULT_DISABLE_SHOW_SCORE_ONLY:
-                if ($feedbackType == 0) {
+                if (0 == $feedbackType) {
                     $hide_expected_answer = true;
                 }
                 break;
@@ -489,7 +489,7 @@ class ExerciseShowFunctions
         }
 
         $content = '<tr>';
-        if ($hideStudentChoice === false) {
+        if (false === $hideStudentChoice) {
             $content .= '<td width="5%">';
             $course_id = api_get_course_int_id();
             $new_options = Question::readQuestionOption($questionId, $course_id);
@@ -531,7 +531,7 @@ class ExerciseShowFunctions
             $content .= '</td>';
         }
 
-        if ($feedbackType != EXERCISE_FEEDBACK_TYPE_EXAM) {
+        if (EXERCISE_FEEDBACK_TYPE_EXAM != $feedbackType) {
             $content .= '<td width="20%">';
             $color = 'black';
             if (isset($new_options[$studentChoice]) || in_array(
@@ -583,7 +583,7 @@ class ExerciseShowFunctions
         $inResultsDisabled
     ) {
         $hideExpectedAnswer = false;
-        if ($feedbackType == 0 && $inResultsDisabled == 2) {
+        if (0 == $feedbackType && 2 == $inResultsDisabled) {
             $hideExpectedAnswer = true;
         }
 
@@ -645,7 +645,7 @@ class ExerciseShowFunctions
                 '</div>
             </td>';
 
-        if ($feedbackType != EXERCISE_FEEDBACK_TYPE_EXAM) {
+        if (EXERCISE_FEEDBACK_TYPE_EXAM != $feedbackType) {
             echo '<td width="20%">';
             if (isset($newOptions[$studentChoice])) {
                 echo '<span style="font-weight: bold; color: black;">'.nl2br($answerComment).'</span>';
@@ -693,7 +693,7 @@ class ExerciseShowFunctions
                 $hide_expected_answer = true;
                 break;
             case RESULT_DISABLE_SHOW_SCORE_ONLY:
-                if ($feedbackType == 0) {
+                if (0 == $feedbackType) {
                     $hide_expected_answer = true;
                 }
                 break;
@@ -708,7 +708,7 @@ class ExerciseShowFunctions
 
         echo '<tr>';
 
-        if ($hideStudentChoice === false) {
+        if (false === $hideStudentChoice) {
             echo '<td width="5%">';
             // Your choice
             $question = new MultipleAnswerCombinationTrueFalse();
@@ -750,7 +750,7 @@ class ExerciseShowFunctions
             echo '</td>';
         }
 
-        if ($feedbackType != EXERCISE_FEEDBACK_TYPE_EXAM) {
+        if (EXERCISE_FEEDBACK_TYPE_EXAM != $feedbackType) {
             echo '<td width="20%">';
             //@todo replace this harcoded value
             if ($studentChoice || in_array($resultsDisabled, [
@@ -789,7 +789,7 @@ class ExerciseShowFunctions
         $resultsDisabled = 0
     ) {
         $comments = Event::get_comments($exeId, $questionId);
-        if ($feedbackType != EXERCISE_FEEDBACK_TYPE_EXAM) {
+        if (EXERCISE_FEEDBACK_TYPE_EXAM != $feedbackType) {
             if ($questionScore <= 0 && empty($comments)) {
                 echo '<br />'.ExerciseLib::getNotCorrectedYetText();
             }
diff --git a/public/main/inc/lib/export.lib.inc.php b/public/main/inc/lib/export.lib.inc.php
index 15d3a8268f..179a122c2f 100644
--- a/public/main/inc/lib/export.lib.inc.php
+++ b/public/main/inc/lib/export.lib.inc.php
@@ -99,7 +99,7 @@ class Export
         foreach ($data as $row) {
             $string = implode("</td><td>", $row);
             $string = '<tr><td>'.$string.'</td></tr>';
-            if ($encoding != 'utf-8') {
+            if ('utf-8' != $encoding) {
                 $string = api_convert_encoding($string, $encoding, $systemEncoding);
             }
             fwrite($handle, $string."\n");
diff --git a/public/main/inc/lib/extra_field.lib.php b/public/main/inc/lib/extra_field.lib.php
index 1561b8f97b..938924500b 100644
--- a/public/main/inc/lib/extra_field.lib.php
+++ b/public/main/inc/lib/extra_field.lib.php
@@ -609,7 +609,7 @@ class ExtraField extends Model
                     $field['id']
                 );
 
-                if ($field['field_type'] == self::FIELD_TYPE_TAG) {
+                if (self::FIELD_TYPE_TAG == $field['field_type']) {
                     $tags = UserManager::get_user_tags_to_string(
                         $itemId,
                         $field['id'],
@@ -802,7 +802,7 @@ class ExtraField extends Model
         $options_parsed = [];
         if (!empty($options)) {
             foreach ($options as $option) {
-                if ($option['option_value'] == 0) {
+                if (0 == $option['option_value']) {
                     $options_parsed[$option['id']][] = $option;
                 } else {
                     $options_parsed[$option['option_value']][] = $option;
@@ -847,7 +847,7 @@ class ExtraField extends Model
             foreach ($options_parsed as $option) {
                 foreach ($option as $key => $item) {
                     $string .= $item['display_text'];
-                    if ($key == 0) {
+                    if (0 == $key) {
                         $string .= ':';
                     } else {
                         if (isset($option[$key + 1])) {
@@ -1082,7 +1082,7 @@ class ExtraField extends Model
                 }
 
                 if (!$adminPermissions) {
-                    if ($field_details['visible_to_self'] == 0) {
+                    if (0 == $field_details['visible_to_self']) {
                         continue;
                     }
 
@@ -1099,7 +1099,7 @@ class ExtraField extends Model
 
                 $freezeElement = false;
                 if (!$adminPermissions) {
-                    $freezeElement = $field_details['visible_to_self'] == 0 || $field_details['changeable'] == 0;
+                    $freezeElement = 0 == $field_details['visible_to_self'] || 0 == $field_details['changeable'];
                 }
 
                 $translatedDisplayText = get_lang($field_details['display_text'], true);
@@ -1212,7 +1212,7 @@ class ExtraField extends Model
 
                             if (empty($checkboxAttributes) &&
                                 isset($field_details['default_value']) && empty($extraData)) {
-                                if ($field_details['default_value'] == 1) {
+                                if (1 == $field_details['default_value']) {
                                     $checkboxAttributes['checked'] = 1;
                                 }
                             }
@@ -1362,7 +1362,7 @@ class ExtraField extends Model
                                 ['style' => 'width: 100%;']
                             );
 
-                            if ($useTagAsSelect === false) {
+                            if (false === $useTagAsSelect) {
                                 $tagsSelect->setAttribute('class', null);
                             }
 
@@ -1373,7 +1373,7 @@ class ExtraField extends Model
                             $tagsSelect->setMultiple(true);
 
                             $selectedOptions = [];
-                            if ($this->type === 'user') {
+                            if ('user' === $this->type) {
                                 // The magic should be here
                                 $user_tags = UserManager::get_user_tags(
                                     $itemId,
@@ -1475,7 +1475,7 @@ class ExtraField extends Model
                                 ]
                             );
 
-                            if ($useTagAsSelect == false) {
+                            if (false == $useTagAsSelect) {
                                 $jquery_ready_content .= "
                                 $('#extra_$variable').select2({
                                     ajax: {
@@ -1524,7 +1524,7 @@ class ExtraField extends Model
                         $leftpad = '1.7';
                         $top = '0.4';
                         $domain = parse_url($icon_path, PHP_URL_HOST);
-                        if ($domain == 'www.hi5.com' or $domain == 'hi5.com') {
+                        if ('www.hi5.com' == $domain or 'hi5.com' == $domain) {
                             $leftpad = '3';
                             $top = '0';
                         }
@@ -1603,7 +1603,7 @@ class ExtraField extends Model
                             }
                         }
 
-                        if ($fieldTexts[0] === 'Image') {
+                        if ('Image' === $fieldTexts[0]) {
                             $fieldTexts[0] = get_lang($fieldTexts[0]);
                         }
 
@@ -1832,10 +1832,10 @@ class ExtraField extends Model
      */
     public function setupBreadcrumb(&$breadcrumb, $action)
     {
-        if ($action == 'add') {
+        if ('add' == $action) {
             $breadcrumb[] = ['url' => $this->pageUrl, 'name' => $this->pageName];
             $breadcrumb[] = ['url' => '#', 'name' => get_lang('Add')];
-        } elseif ($action == 'edit') {
+        } elseif ('edit' == $action) {
             $breadcrumb[] = ['url' => $this->pageUrl, 'name' => $this->pageName];
             $breadcrumb[] = ['url' => '#', 'name' => get_lang('Edit')];
         } else {
@@ -1978,7 +1978,7 @@ class ExtraField extends Model
         $header = get_lang('Add');
         $defaults = [];
 
-        if ($action === 'edit') {
+        if ('edit' === $action) {
             $header = get_lang('Edit');
             // Setting the defaults
             $defaults = $this->get($id, false);
@@ -1986,7 +1986,7 @@ class ExtraField extends Model
 
         $form->addElement('header', $header);
 
-        if ($action === 'edit') {
+        if ('edit' === $action) {
             $translateUrl = api_get_path(WEB_CODE_PATH).'extrafield/translate.php?'
                 .http_build_query(['extra_field' => $id]);
             $translateButton = Display::toolbarButton(get_lang('Translate this term'), $translateUrl, 'language', 'link');
@@ -2030,7 +2030,7 @@ class ExtraField extends Model
             self::FIELD_TYPE_TRIPLE_SELECT,
         ];
 
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             if (in_array($defaults['field_type'], $fieldWithOptions)) {
                 $url = Display::url(
                     get_lang('Edit extra field options'),
@@ -2038,7 +2038,7 @@ class ExtraField extends Model
                 );
                 $form->addElement('label', null, $url);
 
-                if ($defaults['field_type'] == self::FIELD_TYPE_SELECT) {
+                if (self::FIELD_TYPE_SELECT == $defaults['field_type']) {
                     $urlWorkFlow = Display::url(
                         get_lang('Edit this field\'s workflow'),
                         'extra_field_workflow.php?type='.$this->type.'&field_id='.$id
@@ -2085,7 +2085,7 @@ class ExtraField extends Model
 
         $form->addElement('text', 'field_order', get_lang('Order'));
 
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $option = new ExtraFieldOption($this->type);
             $defaults['field_options'] = $option->get_field_options_by_field_to_string($id);
             $form->addButtonUpdate(get_lang('Edit'));
@@ -2179,7 +2179,7 @@ JAVASCRIPT;
                     ? $search_options['field_default_value']
                     : null;
 
-                if ($field['field_type'] == self::FIELD_TYPE_DOUBLE_SELECT) {
+                if (self::FIELD_TYPE_DOUBLE_SELECT == $field['field_type']) {
                     // Add 2 selects
                     $options = $extraFieldOption->get_field_options_by_field($field['id']);
                     $options = self::extra_field_double_select_convert_array_to_ordered_array($options);
@@ -2188,7 +2188,7 @@ JAVASCRIPT;
                     if (!empty($options)) {
                         foreach ($options as $option) {
                             foreach ($option as $sub_option) {
-                                if ($sub_option['option_value'] == 0) {
+                                if (0 == $sub_option['option_value']) {
                                     $first_options[] = $sub_option['field_id'].'#'.$sub_option['id'].':'
                                         .$sub_option['display_text'];
                                 }
@@ -2300,7 +2300,7 @@ JAVASCRIPT;
                         $info = $this->get($extra['id']);
                         $extra_fields_info[$extra['id']] = $info;
                     }
-                    if (isset($info['field_type']) && $info['field_type'] == self::FIELD_TYPE_DOUBLE_SELECT) {
+                    if (isset($info['field_type']) && self::FIELD_TYPE_DOUBLE_SELECT == $info['field_type']) {
                         $double_fields[$info['id']] = $info;
                     }
                     $counter++;
@@ -2358,7 +2358,7 @@ JAVASCRIPT;
                             ";
                     } else {
                         if (isset($extra_field_info['field_type']) &&
-                            $extra_field_info['field_type'] == self::FIELD_TYPE_TAG
+                            self::FIELD_TYPE_TAG == $extra_field_info['field_type']
                         ) {
                             $options['where'] = str_replace(
                                 $extra_info['field'],
@@ -2429,13 +2429,13 @@ JAVASCRIPT;
         if (empty($col)) {
             return '';
         }
-        if ($oper == 'bw' || $oper == 'bn') {
+        if ('bw' == $oper || 'bn' == $oper) {
             $val .= '%';
         }
-        if ($oper == 'ew' || $oper == 'en') {
+        if ('ew' == $oper || 'en' == $oper) {
             $val = '%'.$val;
         }
-        if ($oper == 'cn' || $oper == 'nc' || $oper == 'in' || $oper == 'ni') {
+        if ('cn' == $oper || 'nc' == $oper || 'in' == $oper || 'ni' == $oper) {
             if (is_array($val)) {
                 $result = '"%'.implode(';', $val).'%"';
                 foreach ($val as $item) {
@@ -2474,7 +2474,7 @@ JAVASCRIPT;
             if (empty($rule)) {
                 continue;
             }
-            if (strpos($rule->field, '_second') === false) {
+            if (false === strpos($rule->field, '_second')) {
             } else {
                 $my_field = str_replace('_second', '', $rule->field);
                 $double_select[$my_field] = $rule->data;
@@ -2486,20 +2486,20 @@ JAVASCRIPT;
             if (empty($rule)) {
                 continue;
             }
-            if (strpos($rule->field, $stringToSearch) === false) {
+            if (false === strpos($rule->field, $stringToSearch)) {
                 // normal fields
                 $field = $rule->field;
-                if (isset($rule->data) && is_string($rule->data) && $rule->data != -1) {
+                if (isset($rule->data) && is_string($rule->data) && -1 != $rule->data) {
                     $condition_array[] = $this->get_where_clause($field, $rule->op, $rule->data);
                 }
             } else {
                 // Extra fields
-                if (strpos($rule->field, '_second') === false) {
+                if (false === strpos($rule->field, '_second')) {
                     //No _second
                     $original_field = str_replace($stringToSearch, '', $rule->field);
                     $field_option = $this->get_handler_field_info_by_field_variable($original_field);
 
-                    if ($field_option['field_type'] == self::FIELD_TYPE_DOUBLE_SELECT) {
+                    if (self::FIELD_TYPE_DOUBLE_SELECT == $field_option['field_type']) {
                         if (isset($double_select[$rule->field])) {
                             $data = explode('#', $rule->data);
                             $rule->data = $data[1].'::'.$double_select[$rule->field];
@@ -2519,7 +2519,7 @@ JAVASCRIPT;
                         }
                     } else {
                         if (isset($rule->data)) {
-                            if (isset($rule->data) && is_int($rule->data) && $rule->data == -1) {
+                            if (isset($rule->data) && is_int($rule->data) && -1 == $rule->data) {
                                 continue;
                             }
                             $condition_array[] = ' ('
@@ -2564,7 +2564,7 @@ JAVASCRIPT;
         $em = Database::getManager();
 
         foreach ($fields as $field) {
-            if ($field['visible_to_self'] != '1') {
+            if ('1' != $field['visible_to_self']) {
                 continue;
             }
 
@@ -2575,7 +2575,7 @@ JAVASCRIPT;
                 true
             );
 
-            if ($field['field_type'] == ExtraField::FIELD_TYPE_TAG) {
+            if (ExtraField::FIELD_TYPE_TAG == $field['field_type']) {
                 $tags = $em
                     ->getRepository('ChamiloCoreBundle:ExtraFieldRelTag')
                     ->findBy(
@@ -2608,14 +2608,14 @@ JAVASCRIPT;
 
             switch ($field['field_type']) {
                 case self::FIELD_TYPE_CHECKBOX:
-                    if ($valueData !== false && $valueData['value'] == '1') {
+                    if (false !== $valueData && '1' == $valueData['value']) {
                         $displayedValue = get_lang('Yes');
                     } else {
                         $displayedValue = get_lang('No');
                     }
                     break;
                 case self::FIELD_TYPE_DATE:
-                    if ($valueData !== false && !empty($valueData['value'])) {
+                    if (false !== $valueData && !empty($valueData['value'])) {
                         $displayedValue = api_format_date($valueData['value'], DATE_FORMAT_LONG_NO_DAY);
                     }
                     break;
@@ -2625,7 +2625,7 @@ JAVASCRIPT;
                     }
                     break;
                 case self::FIELD_TYPE_FILE_IMAGE:
-                    if ($valueData === false || empty($valueData['value'])) {
+                    if (false === $valueData || empty($valueData['value'])) {
                         break;
                     }
 
@@ -2646,7 +2646,7 @@ JAVASCRIPT;
                     );
                     break;
                 case self::FIELD_TYPE_FILE:
-                    if ($valueData === false || empty($valueData['value'])) {
+                    if (false === $valueData || empty($valueData['value'])) {
                         break;
                     }
 
@@ -3218,7 +3218,7 @@ JAVASCRIPT;
         if (!empty($options)) {
             foreach ($options as $option) {
                 foreach ($option as $sub_option) {
-                    if ($sub_option['option_value'] == '0') {
+                    if ('0' == $sub_option['option_value']) {
                         $values[$sub_option['id']] = $sub_option['display_text'];
 
                         continue;
@@ -3291,7 +3291,7 @@ JAVASCRIPT;
         if (!empty($options)) {
             foreach ($options as $option) {
                 foreach ($option as $sub_option) {
-                    if ($sub_option['option_value'] != '0') {
+                    if ('0' != $sub_option['option_value']) {
                         continue;
                     }
 
diff --git a/public/main/inc/lib/extra_field_option.lib.php b/public/main/inc/lib/extra_field_option.lib.php
index a1ff94ce0d..e97b460130 100644
--- a/public/main/inc/lib/extra_field_option.lib.php
+++ b/public/main/inc/lib/extra_field_option.lib.php
@@ -145,7 +145,7 @@ class ExtraFieldOption extends Model
             $params['option_value']
         );
 
-        if ($optionInfo == false) {
+        if (false == $optionInfo) {
             $optionValue = api_replace_dangerous_char($params['option_value']);
             $order = $this->get_max_order($params['field_id']);
             $newParams = [
@@ -229,7 +229,7 @@ class ExtraFieldOption extends Model
                         parent::update($new_params, $showQuery);
                     }
 
-                    if ($params['field_type'] == ExtraField::FIELD_TYPE_SELECT_WITH_TEXT_FIELD) {
+                    if (ExtraField::FIELD_TYPE_SELECT_WITH_TEXT_FIELD == $params['field_type']) {
                         continue;
                     }
 
@@ -345,7 +345,7 @@ class ExtraFieldOption extends Model
                     $optionValue = api_replace_dangerous_char($option);
                     $option = trim($option);
 
-                    if ($option_info != false) {
+                    if (false != $option_info) {
                         continue;
                     }
 
@@ -402,7 +402,7 @@ class ExtraFieldOption extends Model
                 $field_id,
                 $params['option_value']
             );
-            if ($check == false) {
+            if (false == $check) {
                 parent::save($params, $show_query);
             }
         }
@@ -753,7 +753,7 @@ class ExtraFieldOption extends Model
         $form = new FormValidator($form_name, 'post', $url);
         // Setting the form elements
         $header = get_lang('Add');
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $header = get_lang('Edit');
         }
 
@@ -764,7 +764,7 @@ class ExtraFieldOption extends Model
         $form->addElement('hidden', 'type', $this->type);
         $form->addElement('hidden', 'field_id', $this->fieldId);
 
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $translateUrl = api_get_path(WEB_CODE_PATH).'extrafield/translate.php?'.http_build_query([
                 'extra_field_option' => $id,
             ]);
@@ -790,7 +790,7 @@ class ExtraFieldOption extends Model
 
         $defaults = [];
 
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             // Setting the defaults
             $defaults = $this->get($id, false);
             $form->freeze('option_value');
diff --git a/public/main/inc/lib/extra_field_value.lib.php b/public/main/inc/lib/extra_field_value.lib.php
index 593606e4b6..73a134811b 100644
--- a/public/main/inc/lib/extra_field_value.lib.php
+++ b/public/main/inc/lib/extra_field_value.lib.php
@@ -95,7 +95,7 @@ class ExtraFieldValue extends Model
         foreach ($params as $key => $value) {
             $found = strpos($key, '__persist__');
 
-            if ($found === false) {
+            if (false === $found) {
                 continue;
             }
 
@@ -119,7 +119,7 @@ class ExtraFieldValue extends Model
             $field_variable = $fieldDetails['variable'];
 
             // if the field is not visible to the user in the end, we need to apply special rules
-            if ($fieldDetails['visible_to_self'] != 1) {
+            if (1 != $fieldDetails['visible_to_self']) {
                 //only admins should be able to add those values
                 if (!api_is_platform_admin(true, true)) {
                     // although if not admin but sent through a CLI script, we should accept it as well
@@ -176,7 +176,7 @@ class ExtraFieldValue extends Model
                     }
                     break;
                 case ExtraField::FIELD_TYPE_TAG:
-                    if ($type == EntityExtraField::USER_FIELD_TYPE) {
+                    if (EntityExtraField::USER_FIELD_TYPE == $type) {
                         UserManager::delete_user_tags(
                             $params['item_id'],
                             $extraFieldInfo['id']
@@ -278,7 +278,7 @@ class ExtraFieldValue extends Model
                         mkdir($fileDir, $dirPermissions, true);
                     }
 
-                    if (!empty($value['tmp_name']) && isset($value['error']) && $value['error'] == 0) {
+                    if (!empty($value['tmp_name']) && isset($value['error']) && 0 == $value['error']) {
                         // Crop the image to adjust 16:9 ratio
                         if (isset($params['extra_'.$field_variable.'_crop_result'])) {
                             $crop = new Image($value['tmp_name']);
@@ -328,7 +328,7 @@ class ExtraFieldValue extends Model
                         mkdir($fileDir, $dirPermissions, true);
                     }
 
-                    if (!empty($value['tmp_name']) && isset($value['error']) && $value['error'] == 0) {
+                    if (!empty($value['tmp_name']) && isset($value['error']) && 0 == $value['error']) {
                         $cleanedName = api_replace_dangerous_char($value['name']);
                         $fileName = ExtraField::FIELD_TYPE_FILE."_{$params['item_id']}_$cleanedName";
                         moveUploadedFile($value, $fileDir.$fileName);
@@ -339,7 +339,7 @@ class ExtraFieldValue extends Model
                             'value' => $fileDirStored.$fileName,
                         ];
 
-                        if ($this->type !== 'session' && $this->type !== 'course') {
+                        if ('session' !== $this->type && 'course' !== $this->type) {
                             $new_params['comment'] = $comment;
                         }
 
@@ -453,7 +453,7 @@ class ExtraFieldValue extends Model
                     break;
             }
 
-            if ($extraFieldInfo['field_type'] == ExtraField::FIELD_TYPE_TAG) {
+            if (ExtraField::FIELD_TYPE_TAG == $extraFieldInfo['field_type']) {
                 $field_values = self::getAllValuesByItemAndFieldAndValue(
                     $params['item_id'],
                     $params['field_id'],
@@ -474,7 +474,7 @@ class ExtraFieldValue extends Model
                 /* Enable this when field_loggeable is introduced as a table field (2.0)
                 if ($extraFieldInfo['field_loggeable'] == 1) {
                 */
-                if ($extraFieldInfo['field_type'] == ExtraField::FIELD_TYPE_TAG) {
+                if (ExtraField::FIELD_TYPE_TAG == $extraFieldInfo['field_type']) {
                     $option = new ExtraFieldOption($this->type);
                     $optionExists = $option->get($params['value']);
                     if (empty($optionExists)) {
@@ -668,7 +668,7 @@ class ExtraFieldValue extends Model
         if (Database::num_rows($result)) {
             $result = Database::fetch_array($result, 'ASSOC');
             if ($transform) {
-                if ($result['field_type'] == ExtraField::FIELD_TYPE_DOUBLE_SELECT) {
+                if (ExtraField::FIELD_TYPE_DOUBLE_SELECT == $result['field_type']) {
                     if (!empty($result['value'])) {
                         $field_option = new ExtraFieldOption($this->type);
                         $options = explode('::', $result['value']);
@@ -680,7 +680,7 @@ class ExtraFieldValue extends Model
                         }
                     }
                 }
-                if ($result['field_type'] == ExtraField::FIELD_TYPE_SELECT_WITH_TEXT_FIELD) {
+                if (ExtraField::FIELD_TYPE_SELECT_WITH_TEXT_FIELD == $result['field_type']) {
                     if (!empty($result['value'])) {
                         $options = explode('::', $result['value']);
 
@@ -694,7 +694,7 @@ class ExtraFieldValue extends Model
                         }
                     }
                 }
-                if ($result['field_type'] == ExtraField::FIELD_TYPE_TRIPLE_SELECT) {
+                if (ExtraField::FIELD_TYPE_TRIPLE_SELECT == $result['field_type']) {
                     if (!empty($result['value'])) {
                         $optionIds = explode(';', $result['value']);
                         $optionValues = [];
@@ -757,7 +757,7 @@ class ExtraFieldValue extends Model
             $sql .= ' DESC';
         }
         $result = Database::query($sql);
-        if ($result !== false && Database::num_rows($result)) {
+        if (false !== $result && Database::num_rows($result)) {
             if ($all) {
                 $result = Database::store_result($result, 'ASSOC');
             } else {
@@ -866,7 +866,7 @@ class ExtraFieldValue extends Model
             if (in_array($field['id'], $idList)) {
                 $allResults[] = $finalResult[$field['id']];
             } else {
-                if ($field['field_type'] == ExtraField::FIELD_TYPE_TAG) {
+                if (ExtraField::FIELD_TYPE_TAG == $field['field_type']) {
                     $tagResult = [];
                     $tags = $em->getRepository('ChamiloCoreBundle:ExtraFieldRelTag')
                         ->findBy(
@@ -994,7 +994,7 @@ class ExtraFieldValue extends Model
             Database::query($sql);
 
             // Delete file from uploads
-            if ($fieldData['field_type'] == ExtraField::FIELD_TYPE_FILE) {
+            if (ExtraField::FIELD_TYPE_FILE == $fieldData['field_type']) {
                 api_remove_uploaded_file($this->type, basename($fieldValue));
             }
 
diff --git a/public/main/inc/lib/fileDisplay.lib.php b/public/main/inc/lib/fileDisplay.lib.php
index 1d2faac39d..c8370f111f 100644
--- a/public/main/inc/lib/fileDisplay.lib.php
+++ b/public/main/inc/lib/fileDisplay.lib.php
@@ -179,7 +179,7 @@ function choose_image($file_name)
  */
 function chooseFolderIcon($folderPath)
 {
-    if ($folderPath == '/shared_folder') {
+    if ('/shared_folder' == $folderPath) {
         return 'folder_users.png';
     }
 
diff --git a/public/main/inc/lib/fileManage.lib.php b/public/main/inc/lib/fileManage.lib.php
index 9f00976c59..2e17fc0dfd 100644
--- a/public/main/inc/lib/fileManage.lib.php
+++ b/public/main/inc/lib/fileManage.lib.php
@@ -83,7 +83,7 @@ function removeDir($dir)
     }
 
     while ($readdir = readdir($opendir)) {
-        if ($readdir != '..' && $readdir != '.') {
+        if ('..' != $readdir && '.' != $readdir) {
             if (is_file($dir.'/'.$readdir)) {
                 if (!@unlink($dir.'/'.$readdir)) {
                     return false;
@@ -120,7 +120,7 @@ function folder_is_empty($in_folder)
     if (is_dir($in_folder)) {
         $tab_folder_content = scandir($in_folder);
         if ((
-            count($tab_folder_content) == 2 &&
+            2 == count($tab_folder_content) &&
             in_array(".", $tab_folder_content) &&
             in_array("..", $tab_folder_content)
             ) ||
@@ -153,7 +153,7 @@ function my_rename($file_path, $new_file_name)
     $new_file_name = api_replace_dangerous_char($new_file_name);
 
     // If no extension, take the old one
-    if ((strpos($new_file_name, '.') === false) && ($dotpos = strrpos($old_file_name, '.'))) {
+    if ((false === strpos($new_file_name, '.')) && ($dotpos = strrpos($old_file_name, '.'))) {
         $new_file_name .= substr($old_file_name, $dotpos);
     }
 
@@ -202,7 +202,7 @@ function move($source, $target, $forceMove = true, $moveContent = false)
     if (check_name_exist($source)) {
         $file_name = basename($source);
         // move onto self illegal: mv a/b/c a/b/c or mv a/b/c a/b
-        if (strcasecmp($target, dirname($source)) === 0) {
+        if (0 === strcasecmp($target, dirname($source))) {
             return false;
         }
         $isWindowsOS = api_is_windows_os();
@@ -226,7 +226,7 @@ function move($source, $target, $forceMove = true, $moveContent = false)
             return true;
         } elseif (is_dir($source)) {
             // move dir down will cause loop: mv a/b/ a/b/c/ not legal
-            if (strncasecmp($target, $source, strlen($source)) == 0) {
+            if (0 == strncasecmp($target, $source, strlen($source))) {
                 return false;
             }
             /* Directory */
@@ -236,7 +236,7 @@ function move($source, $target, $forceMove = true, $moveContent = false)
                     $out = [];
                     $retVal = -1;
                     exec('mv '.$source.'/* '.$target.'/'.$base, $out, $retVal);
-                    if ($retVal !== 0) {
+                    if (0 !== $retVal) {
                         return false; // mv should return 0 on success
                     }
                     exec('rm -rf '.$source);
@@ -244,7 +244,7 @@ function move($source, $target, $forceMove = true, $moveContent = false)
                     $out = [];
                     $retVal = -1;
                     exec("mv $source $target", $out, $retVal);
-                    if ($retVal !== 0) {
+                    if (0 !== $retVal) {
                         error_log("Chamilo error fileManage.lib.php: mv $source $target\n");
 
                         return false; // mv should return 0 on success
@@ -363,7 +363,7 @@ function getAllPhpFiles($base_path, $includeStatic = false)
         $extensionsArray[] = '.css';
     }
     foreach ($list as $item) {
-        if (substr($item, 0, 1) == '.') {
+        if ('.' == substr($item, 0, 1)) {
             continue;
         }
         $special_dirs = [api_get_path(SYS_TEST_PATH), api_get_path(SYS_COURSE_PATH), api_get_path(SYS_LANG_PATH), api_get_path(SYS_ARCHIVE_PATH)];
diff --git a/public/main/inc/lib/fileUpload.lib.php b/public/main/inc/lib/fileUpload.lib.php
index 01bce3b4df..0169f4a5cc 100644
--- a/public/main/inc/lib/fileUpload.lib.php
+++ b/public/main/inc/lib/fileUpload.lib.php
@@ -12,8 +12,6 @@ use Symfony\Component\HttpFoundation\File\UploadedFile;
  * This is the file upload library for Chamilo.
  * Include/require it in your code to use its functionality.
  *
- * @package chamilo.library
- *
  * @todo test and reorganise
  */
 
@@ -280,7 +278,7 @@ function handle_uploaded_document(
     $defaultVisibility = in_array('document', $defaultVisibility) ? ResourceLink::VISIBILITY_PUBLISHED : ResourceLink::VISIBILITY_DRAFT;
 
     // If the want to unzip, check if the file has a .zip (or ZIP,Zip,ZiP,...) extension
-    if ($unzip == 1 && preg_match('/.zip$/', strtolower($uploadedFile['name']))) {
+    if (1 == $unzip && preg_match('/.zip$/', strtolower($uploadedFile['name']))) {
         return unzip_uploaded_document(
             $courseInfo,
             $userInfo,
@@ -294,7 +292,7 @@ function handle_uploaded_document(
             $onlyUploadFile,
             $whatIfFileExists
         );
-    } elseif ($unzip == 1 && !preg_match('/.zip$/', strtolower($uploadedFile['name']))) {
+    } elseif (1 == $unzip && !preg_match('/.zip$/', strtolower($uploadedFile['name']))) {
         // We can only unzip ZIP files (no gz, tar,...)
         if ($output) {
             Display::addFlash(
@@ -327,7 +325,7 @@ function handle_uploaded_document(
             return false;
         } else {
             // If the upload path differs from / (= root) it will need a slash at the end
-            if ($uploadPath != '/') {
+            if ('/' != $uploadPath) {
                 $uploadPath = $uploadPath.'/';
             }
 
@@ -645,7 +643,7 @@ function dir_total_space($dir_path)
     $sumSize = 0;
     $dirList = [];
     while ($element = readdir($handle)) {
-        if ($element == '.' || $element == '..') {
+        if ('.' == $element || '..' == $element) {
             continue; // Skip the current and parent directories
         }
         if (is_file($element)) {
@@ -888,11 +886,11 @@ function unzip_uploaded_file($uploaded_file, $upload_path, $base_work_dir, $max_
         }
 
         // It happens on Linux that $upload_path sometimes doesn't start with '/'
-        if ($upload_path[0] != '/' && substr($base_work_dir, -1, 1) != '/') {
+        if ('/' != $upload_path[0] && '/' != substr($base_work_dir, -1, 1)) {
             $upload_path = '/'.$upload_path;
         }
 
-        if ($upload_path[strlen($upload_path) - 1] == '/') {
+        if ('/' == $upload_path[strlen($upload_path) - 1]) {
             $upload_path = substr($upload_path, 0, -1);
         }
 
@@ -921,7 +919,7 @@ function unzip_uploaded_file($uploaded_file, $upload_path, $base_work_dir, $max_
             }
             if ($dir = @opendir($base_work_dir.$upload_path)) {
                 while ($file = readdir($dir)) {
-                    if ($file != '.' && $file != '..') {
+                    if ('.' != $file && '..' != $file) {
                         $filetype = 'file';
                         if (is_dir($base_work_dir.$upload_path.'/'.$file)) {
                             $filetype = 'folder';
@@ -1009,7 +1007,7 @@ function unzip_uploaded_document(
         PCLZIP_OPT_REPLACE_NEWER
     );
 
-    if ($onlyUploadFile === false) {
+    if (false === $onlyUploadFile) {
         // Add all documents in the unzipped folder to the database
         add_all_documents_in_folder_to_database(
             $courseInfo,
@@ -1116,7 +1114,7 @@ function clean_up_path($path)
     // Clean up every folder and filename in the path
     foreach ($path_array as $key => &$val) {
         // We don't want to lose the dots in ././folder/file (cfr. zipfile)
-        if ($val != '.') {
+        if ('.' != $val) {
             $val = disable_dangerous_file(api_replace_dangerous_char($val));
         }
     }
@@ -1139,11 +1137,11 @@ function clean_up_path($path)
  */
 function filter_extension(&$filename)
 {
-    if (substr($filename, -1) == '/') {
+    if ('/' == substr($filename, -1)) {
         return 1; // Authorize directories
     }
     $blacklist = api_get_setting('upload_extensions_list_type');
-    if ($blacklist != 'whitelist') { // if = blacklist
+    if ('whitelist' != $blacklist) { // if = blacklist
         $extensions = explode(';', strtolower(api_get_setting('upload_extensions_blacklist')));
 
         $skip = api_get_setting('upload_extensions_skip');
@@ -1153,7 +1151,7 @@ function filter_extension(&$filename)
             return 1; // We're in blacklist mode, so accept empty extensions
         }
         if (in_array(strtolower($ext), $extensions)) {
-            if ($skip == 'true') {
+            if ('true' == $skip) {
                 return 0;
             } else {
                 $new_ext = api_get_setting('upload_extensions_replace_by');
@@ -1173,7 +1171,7 @@ function filter_extension(&$filename)
             return 1; // Accept empty extensions
         }
         if (!in_array(strtolower($ext), $extensions)) {
-            if ($skip == 'true') {
+            if ('true' == $skip) {
                 return 0;
             } else {
                 $new_ext = api_get_setting('upload_extensions_replace_by');
@@ -1227,7 +1225,7 @@ function update_existing_document($_course, $documentId, $filesize, $readonly =
 function item_property_update_on_folder($_course, $path, $user_id)
 {
     // If we are in the root, just return... no need to update anything
-    if ($path == '/') {
+    if ('/' == $path) {
         return;
     }
 
@@ -1235,7 +1233,7 @@ function item_property_update_on_folder($_course, $path, $user_id)
 
     // If the given path ends with a / we remove it
     $endchar = substr($path, strlen($path) - 1, 1);
-    if ($endchar == '/') {
+    if ('/' == $endchar) {
         $path = substr($path, 0, strlen($path) - 1);
     }
 
@@ -1252,7 +1250,7 @@ function item_property_update_on_folder($_course, $path, $user_id)
     $newpath = '';
     foreach ($exploded_path as $key => &$value) {
         // We don't want a slash before our first slash
-        if ($key != 0) {
+        if (0 != $key) {
             $newpath .= '/'.$value;
             // Select ID of given folder
             $folder_id = DocumentManager::get_document_id($_course, $newpath);
@@ -1294,15 +1292,15 @@ function set_default_settings($upload_path, $filename, $filetype = 'file')
     $upload_path = str_replace('\\', '/', $upload_path);
     $upload_path = str_replace('//', '/', $upload_path);
 
-    if ($upload_path == '/') {
+    if ('/' == $upload_path) {
         $upload_path = '';
-    } elseif (!empty($upload_path) && $upload_path[0] != '/') {
+    } elseif (!empty($upload_path) && '/' != $upload_path[0]) {
         $upload_path = "/$upload_path";
     }
 
     $endchar = substr($filename, strlen($filename) - 1, 1);
 
-    if ($endchar == '/') {
+    if ('/' == $endchar) {
         $filename = substr($filename, 0, -1);
     }
     $filename = Database::escape_string($filename);
@@ -1341,10 +1339,10 @@ function search_img_from_html($html_file)
     }
 
     // Aearch and store occurences of the <img> tag in an array
-    $size_file = (filesize($html_file) === 0) ? 1 : filesize($html_file);
-    if (isset($fp) && $fp !== false) {
+    $size_file = (0 === filesize($html_file)) ? 1 : filesize($html_file);
+    if (isset($fp) && false !== $fp) {
         $buffer = fread($fp, $size_file);
-        if (strlen($buffer) >= 0 && $buffer !== false) {
+        if (strlen($buffer) >= 0 && false !== $buffer) {
         } else {
             die('<center>Can not read file.</center>');
         }
@@ -1441,7 +1439,7 @@ function create_unexisting_directory(
         $to_group_id
     );
 
-    if ($folderExists === true) {
+    if (true === $folderExists) {
         if ($generateNewNameIfExists) {
             $counter = 1;
             while (1) {
@@ -1452,7 +1450,7 @@ function create_unexisting_directory(
                     $to_group_id
                 );
 
-                if ($folderExists === false) {
+                if (false === $folderExists) {
                     break;
                 }
                 $counter++;
@@ -1472,7 +1470,7 @@ function create_unexisting_directory(
 
     $systemFolderName .= $suffix;
 
-    if ($title == null) {
+    if (null == $title) {
         $title = basename($desired_dir_name);
     }
 
@@ -1489,7 +1487,7 @@ function create_unexisting_directory(
         $parentId = $parentInfo['iid'];
     }
 
-    if (Database::num_rows($rs) == 0) {
+    if (0 == Database::num_rows($rs)) {
         $document = DocumentManager::addDocument(
             $_course,
             $systemFolderName,
@@ -1632,7 +1630,7 @@ function replace_img_path_in_html_file($original_img_path, $new_img_path, $html_
  */
 function check_for_missing_files($file)
 {
-    if (strrchr($file, '.') == '.htm' || strrchr($file, '.') == '.html') {
+    if ('.htm' == strrchr($file, '.') || '.html' == strrchr($file, '.')) {
         $img_file_path = search_img_from_html($file);
 
         return $img_file_path;
@@ -1654,7 +1652,7 @@ function check_for_missing_files($file)
 function build_missing_files_form($missing_files, $upload_path, $file_name)
 {
     // Do we need a / or not?
-    $added_slash = ($upload_path == '/') ? '' : '/';
+    $added_slash = ('/' == $upload_path) ? '' : '/';
     $folder_id = DocumentManager::get_document_id(api_get_course_info(), $upload_path);
     // Build the form
     $form = "<p><strong>".get_lang('Missing images detected')."</strong></p>"
@@ -1722,14 +1720,14 @@ function add_all_documents_in_folder_to_database(
     if (is_dir($folderPath)) {
         // Run trough
         while ($file = readdir($handle)) {
-            if ($file == '.' || $file == '..') {
+            if ('.' == $file || '..' == $file) {
                 continue;
             }
 
             $parentPath = '';
             if (!empty($parent) && isset($parent['path'])) {
                 $parentPath = $parent['path'];
-                if ($parentPath == '/') {
+                if ('/' == $parentPath) {
                     $parentPath = '';
                 }
             }
@@ -1746,7 +1744,7 @@ function add_all_documents_in_folder_to_database(
                     $groupId
                 );
 
-                if ($folderExists === true) {
+                if (true === $folderExists) {
                     switch ($whatIfFileExists) {
                         case 'overwrite':
                             $documentId = DocumentManager::get_document_id($courseInfo, $completePath, $sessionId);
diff --git a/public/main/inc/lib/formvalidator/Element/HtmlEditor.php b/public/main/inc/lib/formvalidator/Element/HtmlEditor.php
index dd067cf488..73e943743f 100644
--- a/public/main/inc/lib/formvalidator/Element/HtmlEditor.php
+++ b/public/main/inc/lib/formvalidator/Element/HtmlEditor.php
@@ -58,7 +58,7 @@ class HtmlEditor extends HTML_QuickForm_textarea
         if ($this->editor) {
             if ($this->editor->getConfigAttribute('fullPage')) {
                 $value = $this->getValue();
-                if (strlen(trim($value)) == 0) {
+                if (0 == strlen(trim($value))) {
                     // TODO: To be considered whether here to add
                     // language and character set declarations.
                     $value = '<!DOCTYPE html><html><head><title></title></head><body></body></html>';
@@ -103,7 +103,7 @@ class HtmlEditor extends HTML_QuickForm_textarea
 
             $this->editor->setName($this->getName());
             $this->editor->setTextareaId($this->getAttribute('id'));
-            if ($style === true) {
+            if (true === $style) {
                 $result = $this->editor->createHtmlStyle($value);
             } else {
                 $result = $this->editor->createHtml($value);
diff --git a/public/main/inc/lib/formvalidator/FormValidator.class.php b/public/main/inc/lib/formvalidator/FormValidator.class.php
index c0c5ffd232..194dafeb19 100644
--- a/public/main/inc/lib/formvalidator/FormValidator.class.php
+++ b/public/main/inc/lib/formvalidator/FormValidator.class.php
@@ -42,7 +42,7 @@ class FormValidator extends HTML_QuickForm
             $attributes['class'] = 'form-horizontal';
         }
 
-        if (isset($attributes['class']) && strpos($attributes['class'], 'form-search') !== false) {
+        if (isset($attributes['class']) && false !== strpos($attributes['class'], 'form-search')) {
             $layout = 'inline';
         }
 
@@ -68,10 +68,10 @@ class FormValidator extends HTML_QuickForm
         $renderer->setFormTemplate($formTemplate);
 
         // Element template
-        if (isset($attributes['class']) && $attributes['class'] == 'form-inline') {
+        if (isset($attributes['class']) && 'form-inline' == $attributes['class']) {
             $elementTemplate = ' {label}  {element} ';
             $renderer->setElementTemplate($elementTemplate);
-        } elseif (isset($attributes['class']) && $attributes['class'] == 'form-search') {
+        } elseif (isset($attributes['class']) && 'form-search' == $attributes['class']) {
             $elementTemplate = ' {label}  {element} ';
             $renderer->setElementTemplate($elementTemplate);
         } else {
@@ -1075,9 +1075,9 @@ EOT;
     public function addGeoLocationMapField($name, $label, $dataValue, $hideGeoLocalizationDetails = false)
     {
         $gMapsPlugin = GoogleMapsPlugin::create();
-        $geolocalization = $gMapsPlugin->get('enable_api') === 'true';
+        $geolocalization = 'true' === $gMapsPlugin->get('enable_api');
 
-        if ($geolocalization && $gMapsPlugin->javascriptIncluded === false) {
+        if ($geolocalization && false === $gMapsPlugin->javascriptIncluded) {
             $gmapsApiKey = $gMapsPlugin->get('api_key');
             $url = '//maps.googleapis.com/maps/api/js?key='.$gmapsApiKey;
             $this->addHtml('<script type="text/javascript" src="'.$url.'" ></script>');
@@ -1382,7 +1382,7 @@ EOT;
             '/(^-?\d\d*\.\d*$)|(^-?\d\d*$)|(^-?\.\d\d*$)|(^-?\d\d*\,\d*$)|(^-?\,\d\d*$)/'
         );*/
 
-        if ($allowNegative == false) {
+        if (false == $allowNegative) {
             $this->addRule(
                 $name,
                 get_lang('Negative value'),
@@ -1557,7 +1557,7 @@ EOT;
      */
     public function addPasswordRule($elementName, $groupName = '')
     {
-        if (api_get_setting('security.check_password') == 'true') {
+        if ('true' == api_get_setting('security.check_password')) {
             $message = get_lang('this password  is too simple. Use a pass like this').': '.api_generate_password();
 
             if (!empty($groupName)) {
@@ -1566,7 +1566,7 @@ EOT;
                 if ($groupObj instanceof HTML_QuickForm_group) {
                     $elementName = $groupObj->getElementName($elementName);
 
-                    if ($elementName === false) {
+                    if (false === $elementName) {
                         throw new Exception("The $groupName doesn't have the element $elementName");
                     }
 
@@ -1626,7 +1626,7 @@ EOT;
                 $options[$item['id']] = $item['name'];
                 $name = $item['name'];
                 if (empty($defaultId)) {
-                    $defaultId = $item['default_template'] == 1 ? $item['id'] : '';
+                    $defaultId = 1 == $item['default_template'] ? $item['id'] : '';
                 }
             }
 
diff --git a/public/main/inc/lib/formvalidator/Rule/CompareDateTimeText.php b/public/main/inc/lib/formvalidator/Rule/CompareDateTimeText.php
index 7c43b1558c..a32886229f 100644
--- a/public/main/inc/lib/formvalidator/Rule/CompareDateTimeText.php
+++ b/public/main/inc/lib/formvalidator/Rule/CompareDateTimeText.php
@@ -18,7 +18,7 @@ class HTML_QuickForm_Rule_CompareDateTimeText extends HTML_QuickForm_Rule_Compar
         $datetime1 = api_strtotime($values[0]);
         $datetime2 = api_strtotime($values[1]);
 
-        if (strpos($operator, 'allow_empty') !== false) {
+        if (false !== strpos($operator, 'allow_empty')) {
             $operator = str_replace('allow_empty', '', $operator);
             if (!$datetime2 || empty($datetime2)) {
                 return true;
diff --git a/public/main/inc/lib/formvalidator/Rule/FileName.php b/public/main/inc/lib/formvalidator/Rule/FileName.php
index 01312ced71..ecec5a9f1a 100644
--- a/public/main/inc/lib/formvalidator/Rule/FileName.php
+++ b/public/main/inc/lib/formvalidator/Rule/FileName.php
@@ -16,8 +16,8 @@ class HTML_QuickForm_Rule_FileName extends HTML_QuickForm_Rule
      */
     public function validate($value, $options = null)
     {
-        if ((isset($elementValue['error']) && $elementValue['error'] == 0) ||
-            (!empty($elementValue['tmp_name']) && $elementValue['tmp_name'] != 'none')) {
+        if ((isset($elementValue['error']) && 0 == $elementValue['error']) ||
+            (!empty($elementValue['tmp_name']) && 'none' != $elementValue['tmp_name'])) {
             return is_uploaded_file($elementValue['tmp_name']);
         } else {
             return false;
diff --git a/public/main/inc/lib/formvalidator/Rule/MultipleRequired.php b/public/main/inc/lib/formvalidator/Rule/MultipleRequired.php
index 7a42f50a50..bb4506fc01 100644
--- a/public/main/inc/lib/formvalidator/Rule/MultipleRequired.php
+++ b/public/main/inc/lib/formvalidator/Rule/MultipleRequired.php
@@ -31,7 +31,7 @@ class HTML_QuickForm_Rule_MultipleRequired extends HTML_QuickForm_Rule
         if (is_array($value)) {
             $value = implode(null, $value);
         }
-        if ((string) $value == '') {
+        if ('' == (string) $value) {
             return false;
         }
 
diff --git a/public/main/inc/lib/formvalidator/Rule/UploadFile.php b/public/main/inc/lib/formvalidator/Rule/UploadFile.php
index aab0f434c9..1e080370f0 100644
--- a/public/main/inc/lib/formvalidator/Rule/UploadFile.php
+++ b/public/main/inc/lib/formvalidator/Rule/UploadFile.php
@@ -18,8 +18,8 @@ class HTML_QuickForm_Rule_UploadFile extends HTML_QuickForm_Rule
      */
     public function validate($elementValue, $regex)
     {
-        if ((isset($elementValue['error']) && $elementValue['error'] == 0) ||
-            (!empty($elementValue['tmp_name']) && $elementValue['tmp_name'] != 'none')) {
+        if ((isset($elementValue['error']) && 0 == $elementValue['error']) ||
+            (!empty($elementValue['tmp_name']) && 'none' != $elementValue['tmp_name'])) {
             return is_uploaded_file($elementValue['tmp_name']);
         } else {
             return false;
diff --git a/public/main/inc/lib/formvalidator/Rule/Username.php b/public/main/inc/lib/formvalidator/Rule/Username.php
index 079f214d36..81df5ee18f 100644
--- a/public/main/inc/lib/formvalidator/Rule/Username.php
+++ b/public/main/inc/lib/formvalidator/Rule/Username.php
@@ -21,7 +21,7 @@ class HTML_QuickForm_Rule_Username extends HTML_QuickForm_Rule
      */
     public function validate($username, $options)
     {
-        if (api_get_setting('login_is_email') == 'true') {
+        if ('true' == api_get_setting('login_is_email')) {
             return api_valid_email($username);
         } else {
             return UserManager::is_username_valid($username);
diff --git a/public/main/inc/lib/formvalidator/Rule/UsernameAvailable.php b/public/main/inc/lib/formvalidator/Rule/UsernameAvailable.php
index af242eba32..3b95e24431 100644
--- a/public/main/inc/lib/formvalidator/Rule/UsernameAvailable.php
+++ b/public/main/inc/lib/formvalidator/Rule/UsernameAvailable.php
@@ -29,6 +29,6 @@ class HTML_QuickForm_Rule_UsernameAvailable extends HTML_QuickForm_Rule
         $res = Database::query($sql);
         $number = Database::num_rows($res);
 
-        return $number == 0;
+        return 0 == $number;
     }
 }
diff --git a/public/main/inc/lib/geometry.lib.php b/public/main/inc/lib/geometry.lib.php
index 764a7b1eb8..37eeeb8262 100644
--- a/public/main/inc/lib/geometry.lib.php
+++ b/public/main/inc/lib/geometry.lib.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * @author Arnaud Ligot (CBlue SPRL) <arnaud@cblue.be>
- *
- * @package chamilo.include.geometry
  */
 define('DEBUG', false);
 
@@ -153,7 +151,7 @@ function poly_compile($poly, $max, $test = false)
         // droite--> rien à faire
         // elevation between $poly[0]['x'] and $poly[1]['x'])
         $rest = $poly[0]['y'] - $poly[1]['y'];
-        if ($rest != 0) {
+        if (0 != $rest) {
             $pente1 = ($poly[0]['x'] - $poly[1]['x']) / ($rest);
         } else {
             $pente1 = 0;
@@ -209,7 +207,7 @@ function poly_compile($poly, $max, $test = false)
 
             for ($k = round($bords[$i][$j]); $k <= $bords[$i][$j + 1]; $k++) {
                 $res[$k][$i] = true; //filling the array with trues
-                if ($test == 1) {
+                if (1 == $test) {
                     /*how to draw the polygon in a human way:
                     In ubuntu : sudo apt-get install gnuplot
                     Create an empty file with all points with the result of this echos (No commas, no point, no headers)
@@ -239,20 +237,20 @@ function poly_compile($poly, $max, $test = false)
  */
 function poly_dump(&$poly, $max, $format = 'raw')
 {
-    if ($format == 'html') {
+    if ('html' == $format) {
         $s = "<div style='font-size: 8px; line-height:3px'><pre>\n";
     }
     for ($i = 0; $i < $max['y']; $i++) {
         for ($j = 0; $j < $max['x']; $j++) {
-            if ($poly[$j][$i] == true) {
-                $s .= ($format == 'html' ? "<b>1</b>" : '1');
+            if (true == $poly[$j][$i]) {
+                $s .= ('html' == $format ? "<b>1</b>" : '1');
             } else {
                 $s .= "0";
             }
         }
-        $s .= ($format == 'html' ? "<br />\n" : "\n");
+        $s .= ('html' == $format ? "<br />\n" : "\n");
     }
-    $s .= ($format == 'html' ? "</pre></div>\n" : "\n");
+    $s .= ('html' == $format ? "</pre></div>\n" : "\n");
 
     return $s;
 }
@@ -274,13 +272,13 @@ function poly_result(&$poly1, &$poly2, $max)
 
     for ($i = 0; $i < $max['x']; $i++) {
         for ($j = 0; $j < $max['y']; $j++) {
-            if (isset($poly1[$i][$j]) && ($poly1[$i][$j] == true)) {
+            if (isset($poly1[$i][$j]) && (true == $poly1[$i][$j])) {
                 $surfaceOf1++;
-                if (isset($poly2[$i][$j]) && ($poly2[$i][$j] == false)) {
+                if (isset($poly2[$i][$j]) && (false == $poly2[$i][$j])) {
                     $onlyIn1++;
                 }
             }
-            if (isset($poly2[$i][$j]) && ($poly2[$i][$j] == true)) {
+            if (isset($poly2[$i][$j]) && (true == $poly2[$i][$j])) {
                 $surfaceOf2++;
             }
         }
@@ -307,8 +305,8 @@ function poly_touch(&$poly1, &$poly2, $max)
 {
     for ($i = 0; $i < $max['x']; $i++) {
         for ($j = 0; $j < $max['y']; $j++) {
-            if (isset($poly1[$i][$j]) && ($poly1[$i][$j] == true)
-                && isset($poly2[$i][$j]) && ($poly2[$i][$j] == true)) {
+            if (isset($poly1[$i][$j]) && (true == $poly1[$i][$j])
+                && isset($poly2[$i][$j]) && (true == $poly2[$i][$j])) {
                 return true;
             }
         }
diff --git a/public/main/inc/lib/glossary.lib.php b/public/main/inc/lib/glossary.lib.php
index 09d590c0fa..88bce100c8 100644
--- a/public/main/inc/lib/glossary.lib.php
+++ b/public/main/inc/lib/glossary.lib.php
@@ -195,7 +195,7 @@ class GlossaryManager
 					    c_id = $course_id AND
 					    glossary_id = ".intval($values['glossary_id']);
             $result = Database::query($sql);
-            if ($result === false) {
+            if (false === $result) {
                 return false;
             }
 
@@ -232,7 +232,7 @@ class GlossaryManager
         $get_max = "SELECT MAX(display_order) FROM $table
                     WHERE c_id = $course_id ";
         $res_max = Database::query($get_max);
-        if (Database::num_rows($res_max) == 0) {
+        if (0 == Database::num_rows($res_max)) {
             return 0;
         }
         $row = Database::fetch_array($res_max);
@@ -261,7 +261,7 @@ class GlossaryManager
                 WHERE
                     c_id = $course_id AND
                     name = '".Database::escape_string($term)."'";
-        if ($not_id != '') {
+        if ('' != $not_id) {
             $sql .= " AND glossary_id <> '".intval($not_id)."'";
         }
         $result = Database::query($sql);
@@ -306,7 +306,7 @@ class GlossaryManager
                     ip.c_id = ".api_get_course_int_id();
 
         $result = Database::query($sql);
-        if ($result === false || Database::num_rows($result) != 1) {
+        if (false === $result || 1 != Database::num_rows($result)) {
             return false;
         }
 
@@ -339,7 +339,7 @@ class GlossaryManager
                     c_id = $course_id AND 
                     glossary_id='".$glossary_id."'";
         $result = Database::query($sql);
-        if ($result === false || Database::affected_rows($result) < 1) {
+        if (false === $result || Database::affected_rows($result) < 1) {
             return false;
         }
 
@@ -415,7 +415,7 @@ class GlossaryManager
                 Display::return_icon('save.png', get_lang('Export'), '', ICON_SIZE_MEDIUM).'</a>';
         }
 
-        if ($view === 'table' || !isset($view)) {
+        if ('table' === $view || !isset($view)) {
             $actionsLeft .= '<a href="index.php?'.api_get_cidreq().'&action=changeview&view=list">'.
                 Display::return_icon('view_detailed.png', get_lang('List view'), '', ICON_SIZE_MEDIUM).'</a>';
         } else {
@@ -435,7 +435,7 @@ class GlossaryManager
             $orderList = 'ASC';
         }
         if (!api_is_allowed_to_edit(true, true, true)) {
-            if ($orderList === 'ASC') {
+            if ('ASC' === $orderList) {
                 $actionsLeft .= Display::url(
                     Display::return_icon('falling.png', get_lang('Sort Descending'), [], ICON_SIZE_MEDIUM),
                     api_get_self().'?'.api_get_cidreq().'&'.http_build_query(['order' => 'DESC'])
@@ -470,7 +470,7 @@ class GlossaryManager
 
         $content = $toolbar;
 
-        if (!$view || $view === 'table') {
+        if (!$view || 'table' === $view) {
             $table = new SortableTable(
                 'glossary',
                 ['GlossaryManager', 'get_number_glossary_terms'],
@@ -486,7 +486,7 @@ class GlossaryManager
             $content .= $table->return_table();
         }
 
-        if ($view === 'list') {
+        if ('list' === $view) {
             $content .= self::displayGlossaryList();
         }
 
@@ -539,7 +539,7 @@ class GlossaryManager
                 WHERE c_id = $course_id $sql_filter
                 $keywordCondition ";
         $res = Database::query($sql);
-        if ($res === false) {
+        if (false === $res) {
             return 0;
         }
         $obj = Database::fetch_object($res);
@@ -623,13 +623,13 @@ class GlossaryManager
             $session_img = api_get_session_image($data['session_id'], $_user['status']);
             $array[0] = $data[0].$session_img;
 
-            if (!$view || $view === 'table') {
+            if (!$view || 'table' === $view) {
                 $array[1] = str_replace(['<p>', '</p>'], ['', '<br />'], $data[1]);
             } else {
                 $array[1] = $data[1];
             }
 
-            if (isset($_GET['action']) && $_GET['action'] === 'export') {
+            if (isset($_GET['action']) && 'export' === $_GET['action']) {
                 $array[1] = api_html_entity_decode($data[1]);
             }
 
@@ -722,7 +722,7 @@ class GlossaryManager
         $table = Database::get_course_table(TABLE_GLOSSARY);
 
         // sort direction
-        if ($direction === 'up') {
+        if ('up' === $direction) {
             $sortorder = 'DESC';
         } else {
             $sortorder = 'ASC';
@@ -829,7 +829,7 @@ class GlossaryManager
      */
     public static function exportToFormat($format)
     {
-        if ($format == 'pdf') {
+        if ('pdf' == $format) {
             self::export_to_pdf();
 
             return;
diff --git a/public/main/inc/lib/grade_model.lib.php b/public/main/inc/lib/grade_model.lib.php
index 6e6b759da2..f3e9893f5b 100644
--- a/public/main/inc/lib/grade_model.lib.php
+++ b/public/main/inc/lib/grade_model.lib.php
@@ -79,7 +79,7 @@ class GradeModel extends Model
         // Setting the form elements
         $header = get_lang('Add');
 
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $header = get_lang('Edit');
         }
         $id = isset($_GET['id']) ? intval($_GET['id']) : '';
@@ -111,7 +111,7 @@ class GradeModel extends Model
             $components = $this->get_components($defaults['id']);
         }
 
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             if (!empty($components)) {
                 $nr_items = count($components);
             }
@@ -156,7 +156,7 @@ class GradeModel extends Model
             $renderer->setElementTemplate($template_percentage, 'components['.$i.'][percentage]');
             $renderer->setElementTemplate($template_acronym, 'components['.$i.'][acronym]');
 
-            if ($i == 0) {
+            if (0 == $i) {
                 $form->addRule('components['.$i.'][percentage]', get_lang('Required field'), 'required');
                 $form->addRule('components['.$i.'][acronym]', get_lang('Required field'), 'required');
                 $form->addRule('components['.$i.'][title]', get_lang('Required field'), 'required');
@@ -172,7 +172,7 @@ class GradeModel extends Model
         $form->addRule($component_array, get_lang('The sum of all values must be 100'), 'compare_fields', '==@100');
         $form->addElement('label', '', get_lang('The sum of all values must be 100'));
 
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $form->addButtonUpdate(get_lang('Edit'));
         } else {
             $form->addButtonCreate(get_lang('Add'));
@@ -270,11 +270,11 @@ class GradeModel extends Model
      */
     public function fill_grade_model_select_in_form(&$form, $name = 'gradebook_model_id', $default_value = null)
     {
-        if (api_get_setting('gradebook_enable_grade_model') === 'false') {
+        if ('false' === api_get_setting('gradebook_enable_grade_model')) {
             return false;
         }
 
-        if (api_get_setting('teachers_can_change_grade_model_settings') === 'true' || api_is_platform_admin()) {
+        if ('true' === api_get_setting('teachers_can_change_grade_model_settings') || api_is_platform_admin()) {
             $grade_models = $this->get_all();
             $grade_model_options = ['-1' => get_lang('none')];
             if (!empty($grade_models)) {
@@ -286,7 +286,7 @@ class GradeModel extends Model
             $default_platform_setting = api_get_setting('gradebook_default_grade_model_id');
             $default = -1;
 
-            if ($default_platform_setting == -1) {
+            if (-1 == $default_platform_setting) {
                 if (!empty($default_value)) {
                     $default = $default_value;
                 }
@@ -294,7 +294,7 @@ class GradeModel extends Model
                 $default = $default_platform_setting;
             }
 
-            if (!empty($default) && $default != '-1') {
+            if (!empty($default) && '-1' != $default) {
                 $form->setDefaults([$name => $default]);
             }
         }
diff --git a/public/main/inc/lib/gradebook.lib.php b/public/main/inc/lib/gradebook.lib.php
index ef51806ddb..66ec432fc4 100644
--- a/public/main/inc/lib/gradebook.lib.php
+++ b/public/main/inc/lib/gradebook.lib.php
@@ -50,7 +50,7 @@ class Gradebook extends Model
         $setting = Database::store_result($result);
         $setting = isset($setting[0]) ? $setting[0] : null;
         $setting = $setting ? $setting : [];
-        $inactive = isset($setting['selected_value']) && $setting['selected_value'] == 'true';
+        $inactive = isset($setting['selected_value']) && 'true' == $setting['selected_value'];
 
         if ($inactive) {
             return false;
@@ -68,7 +68,7 @@ class Gradebook extends Model
             return true;
         }
 
-        return $item['visibility'] == '1';
+        return '1' == $item['visibility'];
     }
 
     /**
diff --git a/public/main/inc/lib/groupmanager.lib.php b/public/main/inc/lib/groupmanager.lib.php
index e091d44ef2..4a67f16e3f 100644
--- a/public/main/inc/lib/groupmanager.lib.php
+++ b/public/main/inc/lib/groupmanager.lib.php
@@ -165,7 +165,7 @@ class GroupManager
         $groups = [];
         while ($thisGroup = Database::fetch_array($result)) {
             $thisGroup['number_of_members'] = count(self::get_subscribed_users($thisGroup));
-            if ($thisGroup['session_id'] != 0) {
+            if (0 != $thisGroup['session_id']) {
                 $sql = 'SELECT name FROM '.Database::get_main_table(TABLE_MAIN_SESSION).'
                         WHERE id='.$thisGroup['session_id'];
                 $rs_session = Database::query($sql);
@@ -210,11 +210,11 @@ class GroupManager
         $documentAccess = 0;
 
         if ($category) {
-            if ($places == 0) {
+            if (0 == $places) {
                 //if the amount of users per group is not filled in, use the setting from the category
                 $places = $category['max_student'];
             } else {
-                if ($places > $category['max_student'] && $category['max_student'] != 0) {
+                if ($places > $category['max_student'] && 0 != $category['max_student']) {
                     $places = $category['max_student'];
                 }
             }
@@ -324,11 +324,11 @@ class GroupManager
                 $values['allow_new_threads_group']['allow_new_threads'] = 1;
                 $values['default_view_type_group']['default_view_type'] = api_get_setting('default_forum_view');
                 $values['group_forum'] = $lastId;
-                if ($forumState == '1') {
+                if ('1' == $forumState) {
                     $values['public_private_group_forum_group']['public_private_group_forum'] = 'public';
-                } elseif ($forumState == '2') {
+                } elseif ('2' == $forumState) {
                     $values['public_private_group_forum_group']['public_private_group_forum'] = 'private';
-                } elseif ($forumState == '0') {
+                } elseif ('0' == $forumState) {
                     $values['public_private_group_forum_group']['public_private_group_forum'] = 'unavailable';
                 }
                 store_forum($values);
@@ -470,7 +470,7 @@ class GroupManager
                 );
 
                 if (file_exists($source_directory)) {
-                    if (api_get_setting('permanently_remove_deleted_files') === 'true') {
+                    if ('true' === api_get_setting('permanently_remove_deleted_files')) {
                         // Delete
                         my_delete($source_directory);
                     } else {
@@ -746,11 +746,11 @@ class GroupManager
         duplicates the table group_info.forum_state cvargas*/
         $forum_state = (int) $forum_state;
         $sql2 = "UPDATE ".$table_forum." SET ";
-        if ($forum_state === 1) {
+        if (1 === $forum_state) {
             $sql2 .= " forum_group_public_private='public' ";
-        } elseif ($forum_state === 2) {
+        } elseif (2 === $forum_state) {
             $sql2 .= " forum_group_public_private='private' ";
-        } elseif ($forum_state === 0) {
+        } elseif (0 === $forum_state) {
             $sql2 .= " forum_group_public_private='unavailable' ";
         }
         $sql2 .= " WHERE c_id = $courseId AND forum_of_group=".$group_id;
@@ -1138,7 +1138,7 @@ class GroupManager
 				WHERE g.c_id = '.$course_info['real_id'].'
 				AND gu.c_id = g.c_id
 				AND gu.group_id = g.iid ';
-        if ($category_id != null) {
+        if (null != $category_id) {
             $category_id = intval($category_id);
             $sql .= ' AND g.category_id = '.$category_id;
         }
@@ -1229,7 +1229,7 @@ class GroupManager
 
         if (!empty($column) && !empty($direction)) {
             $column = Database::escape_string($column, null, false);
-            $direction = ($direction == 'ASC' ? 'ASC' : 'DESC');
+            $direction = ('ASC' == $direction ? 'ASC' : 'DESC');
             $sql .= " ORDER BY $column $direction";
         }
 
@@ -1504,7 +1504,7 @@ class GroupManager
                 WHERE c_id = $course_id AND iid = $group_id";
         $db_result = Database::query($sql);
         $db_object = Database::fetch_object($db_result);
-        if ($db_object->max_student == 0) {
+        if (0 == $db_object->max_student) {
             return self::INFINITE;
         }
 
@@ -1572,7 +1572,7 @@ class GroupManager
             $result = Database::query($sql);
             $group = Database::fetch_object($result);
 
-            if ($group->status == 0 || $group->self_registration_allowed != 1) {
+            if (0 == $group->status || 1 != $group->self_registration_allowed) {
                 return false;
             }
 
@@ -1605,7 +1605,7 @@ class GroupManager
         $result = Database::query($sql);
         $group = Database::fetch_object($result);
 
-        if ($group->status == 0 || $group->self_unregistration_allowed != 1) {
+        if (0 == $group->status || 1 != $group->self_unregistration_allowed) {
             return false;
         }
 
@@ -1660,18 +1660,18 @@ class GroupManager
         if ($checkMaxNumberStudents) {
             $category = self::get_category_from_group($groupIid);
             if ($category) {
-                if ($category['groups_per_user'] == self::GROUP_PER_MEMBER_NO_LIMIT) {
+                if (self::GROUP_PER_MEMBER_NO_LIMIT == $category['groups_per_user']) {
                     $category['groups_per_user'] = self::INFINITE;
                 }
                 $result = self::user_in_number_of_groups($user_id, $category['id']) < $category['groups_per_user'];
-                if ($result == false) {
+                if (false == $result) {
                     return false;
                 }
             }
 
             $result = self::number_of_students($group_id) < self::maximum_number_of_students($groupIid);
 
-            if ($result == false) {
+            if (false == $result) {
                 return false;
             }
         }
@@ -1709,7 +1709,7 @@ class GroupManager
         $table_group_user = Database::get_course_table(TABLE_GROUP_USER);
         $order_clause = api_sort_by_first_name() ? ' ORDER BY u.firstname, u.lastname' : ' ORDER BY u.lastname, u.firstname';
         $orderListByOfficialCode = api_get_setting('order_user_list_by_official_code');
-        if ($orderListByOfficialCode === 'true') {
+        if ('true' === $orderListByOfficialCode) {
             $order_clause = ' ORDER BY u.official_code, u.firstname, u.lastname';
         }
 
@@ -1770,7 +1770,7 @@ class GroupManager
         $order_clause = api_sort_by_first_name() ? ' ORDER BY u.firstname, u.lastname' : ' ORDER BY u.lastname, u.firstname';
 
         $orderListByOfficialCode = api_get_setting('order_user_list_by_official_code');
-        if ($orderListByOfficialCode === 'true') {
+        if ('true' === $orderListByOfficialCode) {
             $order_clause = ' ORDER BY u.official_code, u.firstname, u.lastname';
         }
 
@@ -2117,7 +2117,7 @@ class GroupManager
             return false;
         }
 
-        if ($groupInfo['status'] == 0) {
+        if (0 == $groupInfo['status']) {
             return false;
         }
 
@@ -2143,7 +2143,7 @@ class GroupManager
             case self::TOOL_PRIVATE_BETWEEN_USERS:
                 // Only works for announcements for now
                 $userIsInGroup = self::is_user_in_group($user_id, $groupInfo);
-                if ($userIsInGroup && $tool == self::GROUP_TOOL_ANNOUNCEMENT) {
+                if ($userIsInGroup && self::GROUP_TOOL_ANNOUNCEMENT == $tool) {
                     return true;
                 }
                 break;
@@ -2190,7 +2190,7 @@ class GroupManager
             return true;
         }
 
-        if ($groupInfo['status'] == 0) {
+        if (0 == $groupInfo['status']) {
             return false;
         }
 
@@ -2311,7 +2311,7 @@ class GroupManager
             if (self::userHasAccessToBrowse($user_id, $this_group, $session_id)) {
                 // Group name
                 $groupNameClass = null;
-                if ($this_group['status'] == 0) {
+                if (0 == $this_group['status']) {
                     $groupNameClass = 'muted';
                 }
 
@@ -2336,7 +2336,7 @@ class GroupManager
                 $group_name .= $session_img;
                 $row[] = $group_name.$group_name2.'<br />'.stripslashes(trim($this_group['description']));
             } else {
-                if ($hideGroup === 'true') {
+                if ('true' === $hideGroup) {
                     continue;
                 }
                 $row[] = $this_group['name'].'<br />'.stripslashes(trim($this_group['description']));
@@ -2351,7 +2351,7 @@ class GroupManager
                         sprintf(get_lang('Login: %s'), $tutor['username']),
                         ENT_QUOTES
                     );
-                    if (api_get_setting('show_email_addresses') === 'true') {
+                    if ('true' === api_get_setting('show_email_addresses')) {
                         $tutor_info .= Display::tag(
                             'span',
                             Display::encrypted_mailto_link(
@@ -2389,7 +2389,7 @@ class GroupManager
             $row[] = $tutor_info;
 
             // Max number of members in group
-            $max_members = $this_group['maximum_number_of_members'] == self::MEMBER_PER_GROUP_NO_LIMIT ? ' ' : ' / '.$this_group['maximum_number_of_members'];
+            $max_members = self::MEMBER_PER_GROUP_NO_LIMIT == $this_group['maximum_number_of_members'] ? ' ' : ' / '.$this_group['maximum_number_of_members'];
 
             // Number of members in group
             $row[] = $this_group['number_of_members'].$max_members;
@@ -2413,7 +2413,7 @@ class GroupManager
                 $edit_actions = '<a href="'.$url.'settings.php?'.api_get_cidreq(true, false).'&gid='.$this_group['id'].'"  title="'.get_lang('Edit').'">'.
                     Display::return_icon('edit.png', get_lang('Edit this group'), '', ICON_SIZE_SMALL).'</a>&nbsp;';
 
-                if ($this_group['status'] == 1) {
+                if (1 == $this_group['status']) {
                     $edit_actions .= '<a href="'.api_get_self().'?'.api_get_cidreq(true, false).'&category='.$category_id.'&action=set_invisible&id='.$this_group['id'].'" title="'.get_lang('Hide').'">'.
                         Display::return_icon('visible.png', get_lang('Hide'), '', ICON_SIZE_SMALL).'</a>&nbsp;';
                 } else {
@@ -2760,7 +2760,7 @@ class GroupManager
             $data[0][] = 'tutors';
         }
 
-        if ($loadUsers == false) {
+        if (false == $loadUsers) {
             $categories = self::get_categories();
 
             foreach ($categories as $categoryInfo) {
@@ -2905,7 +2905,7 @@ class GroupManager
         $categories = self::get_categories();
         if (!empty($categories)) {
             foreach ($categories as $category) {
-                if (api_get_setting('allow_group_categories') == 'true') {
+                if ('true' == api_get_setting('allow_group_categories')) {
                     $content .= '<h2>'.$category['title'].'</h2>';
                 }
                 if (!empty($keyword)) {
@@ -3064,7 +3064,7 @@ class GroupManager
         }
 
         // Just in case also check if document in group is available
-        if ($groupInfo['doc_state'] == 0) {
+        if (0 == $groupInfo['doc_state']) {
             if ($blockPage) {
                 api_not_allowed(true);
             }
@@ -3148,7 +3148,7 @@ class GroupManager
                 break;
         }
 
-        if ($blockPage && $result == false) {
+        if ($blockPage && false == $result) {
             api_not_allowed(true);
         }
 
diff --git a/public/main/inc/lib/image.lib.php b/public/main/inc/lib/image.lib.php
index 5c0c8aeb0e..0757259a08 100644
--- a/public/main/inc/lib/image.lib.php
+++ b/public/main/inc/lib/image.lib.php
@@ -7,8 +7,6 @@
  *
  * @author Julio Montoya <gugli100@gmail.com>
  *
- * @package chamilo.include.image
- *
  * @todo move in a DB configuration setting
  */
 class Image
@@ -141,8 +139,6 @@ class Image
 
 /**
  * Image wrapper class.
- *
- * @package chamilo.include.image
  */
 abstract class ImageWrapper
 {
@@ -192,8 +188,6 @@ abstract class ImageWrapper
  * Imagick Chamilo wrapper.
  *
  * @author jmontoya
- *
- * @package chamilo.include.image
  */
 class ImagickWrapper extends ImageWrapper
 {
@@ -357,8 +351,6 @@ class ImagickWrapper extends ImageWrapper
 
 /**
  * php-gd wrapper.
- *
- * @package chamilo.include.image
  */
 class GDWrapper extends ImageWrapper
 {
@@ -436,7 +428,7 @@ class GDWrapper extends ImageWrapper
         if (!$this->image_validated) {
             return false;
         }
-        if ($border == 1) {
+        if (1 == $border) {
             if ($specific_size) {
                 $width = $thumbw;
                 $height = $thumbh;
@@ -456,7 +448,7 @@ class GDWrapper extends ImageWrapper
             }
             $this->width = $thumbw;
             $this->height = $thumbh;
-        } elseif ($border == 0) {
+        } elseif (0 == $border) {
             if ($specific_size) {
                 $width = $thumbw;
                 $height = $thumbh;
@@ -559,7 +551,7 @@ class GDWrapper extends ImageWrapper
                 if (!$file) {
                     header("Content-type: image/jpeg");
                 }
-                if ($compress == -1) {
+                if (-1 == $compress) {
                     $compress = 100;
                 }
 
@@ -569,7 +561,7 @@ class GDWrapper extends ImageWrapper
                 if (!$file) {
                     header("Content-type: image/png");
                 }
-                if ($compress != -1) {
+                if (-1 != $compress) {
                     @imagetruecolortopalette($this->bg, true, $compress);
                 }
 
@@ -579,7 +571,7 @@ class GDWrapper extends ImageWrapper
                 if (!$file) {
                     header("Content-type: image/gif");
                 }
-                if ($compress != -1) {
+                if (-1 != $compress) {
                     @imagetruecolortopalette($this->bg, true, $compress);
                 }
 
diff --git a/public/main/inc/lib/import.lib.php b/public/main/inc/lib/import.lib.php
index a5f7721cda..adf9b57b9c 100644
--- a/public/main/inc/lib/import.lib.php
+++ b/public/main/inc/lib/import.lib.php
@@ -8,8 +8,6 @@ use League\Csv\Reader;
  * Class Import
  * This class provides some functions which can be used when importing data from
  * external files into Chamilo.
- *
- * @package chamilo.library
  */
 class Import
 {
diff --git a/public/main/inc/lib/internationalization.lib.php b/public/main/inc/lib/internationalization.lib.php
index ef6acb97c1..16e14c91b8 100644
--- a/public/main/inc/lib/internationalization.lib.php
+++ b/public/main/inc/lib/internationalization.lib.php
@@ -14,8 +14,6 @@ use Westsworld\TimeAgo;
  *
  * @author Ivan Tcholakov, <ivantcholakov@gmail.com>, 2009, 2010
  * @author More authors, mentioned in the correpsonding fragments of this source.
- *
- * @package chamilo.library
  */
 // Predefined date formats in Chamilo provided by the language sub-system.
 // To be used as a parameter for the function api_format_date()
@@ -232,14 +230,14 @@ function api_get_timezone()
         // Second, see if a timezone has been chosen for the platform
         $timezoneFromSettings = api_get_setting('timezone_value', 'timezones');
 
-        if ($timezoneFromSettings != null) {
+        if (null != $timezoneFromSettings) {
             $timezone = $timezoneFromSettings;
         }
 
         // If allowed by the administrator
         $allowUserTimezones = api_get_setting('use_users_timezone', 'timezones');
 
-        if ($allowUserTimezones === 'true') {
+        if ('true' === $allowUserTimezones) {
             $userId = api_get_user_id();
             // Get the timezone based on user preference, if it exists
             $newExtraField = new ExtraFieldValue('user');
@@ -273,7 +271,7 @@ function api_get_utc_datetime(
     $returnNullIfInvalidDate = false,
     $returnObj = false
 ) {
-    if (is_null($time) || empty($time) || $time === '0000-00-00 00:00:00') {
+    if (is_null($time) || empty($time) || '0000-00-00 00:00:00' === $time) {
         if ($returnNullIfInvalidDate) {
             return null;
         }
@@ -341,7 +339,7 @@ function api_get_local_time(
     }
 
     // If time is a timestamp, convert it to a string
-    if (is_null($time) || empty($time) || $time == '0000-00-00 00:00:00') {
+    if (is_null($time) || empty($time) || '0000-00-00 00:00:00' == $time) {
         if ($returnNullIfInvalidDate) {
             return null;
         }
@@ -571,13 +569,13 @@ function api_format_date($time, $format = null, $language = null)
  */
 function date_to_str_ago($date, $timeZone = 'UTC', $returnDateDifference = false)
 {
-    if ($date === '0000-00-00 00:00:00') {
+    if ('0000-00-00 00:00:00' === $date) {
         return '';
     }
 
     $getOldTimezone = api_get_timezone();
     $isoCode = api_get_language_isocode();
-    if ($isoCode === 'pt') {
+    if ('pt' === $isoCode) {
         $isoCode = 'pt-BR';
     }
     $isoCode = ucfirst($isoCode);
@@ -1021,7 +1019,7 @@ function api_html_entity_decode($string, $quote_style = ENT_COMPAT, $encoding =
  */
 function api_xml_http_response_encode($string, $from_encoding = 'UTF8')
 {
-    if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
+    if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && 'xmlhttprequest' == strtolower($_SERVER['HTTP_X_REQUESTED_WITH'])) {
         if (empty($from_encoding)) {
             $from_encoding = _api_mb_internal_encoding();
         }
@@ -1853,7 +1851,7 @@ function api_is_valid_utf8($string)
  */
 function api_is_valid_ascii(&$string)
 {
-    return mb_detect_encoding($string, 'ASCII', true) == 'ASCII' ? true : false;
+    return 'ASCII' == mb_detect_encoding($string, 'ASCII', true) ? true : false;
 }
 
 /**
@@ -2013,7 +2011,7 @@ function _api_get_person_name_convention($language, $type)
                     )
                 )
             );
-            $conventions[$key]['sort_by'] = strtolower($conventions[$key]['sort_by']) != 'last_name' ? true : false;
+            $conventions[$key]['sort_by'] = 'last_name' != strtolower($conventions[$key]['sort_by']) ? true : false;
         }
     }
     switch ($type) {
@@ -2035,7 +2033,7 @@ function _api_get_person_name_convention($language, $type)
  */
 function _api_validate_person_name_format($format)
 {
-    if (empty($format) || stripos($format, '%f') === false || stripos($format, '%l') === false) {
+    if (empty($format) || false === stripos($format, '%f') || false === stripos($format, '%l')) {
         return '%t %f %l';
     }
 
@@ -2166,7 +2164,7 @@ function _api_iconv_supports($encoding)
     if (!isset($supported[$encoding])) {
         if (ICONV_INSTALLED) {
             $enc = api_refine_encoding_id($encoding);
-            if ($enc != 'HTML-ENTITIES') {
+            if ('HTML-ENTITIES' != $enc) {
                 $test_string = '';
                 for ($i = 32; $i < 128; $i++) {
                     $test_string .= chr($i);
@@ -2189,7 +2187,7 @@ function _api_convert_encoding_supports($encoding)
 {
     static $supports = [];
     if (!isset($supports[$encoding])) {
-        $supports[$encoding] = _api_get_character_map_name(api_refine_encoding_id($encoding)) != '';
+        $supports[$encoding] = '' != _api_get_character_map_name(api_refine_encoding_id($encoding));
     }
 
     return $supports[$encoding];
diff --git a/public/main/inc/lib/legal.lib.php b/public/main/inc/lib/legal.lib.php
index 031d4073da..ebb2f59847 100644
--- a/public/main/inc/lib/legal.lib.php
+++ b/public/main/inc/lib/legal.lib.php
@@ -266,7 +266,7 @@ class LegalManager
                 }
                 $preview .= get_lang('By clicking on \'Register\' below you are agreeing to the Terms and Conditions');
                 $courseInfo = api_get_course_info();
-                if (api_get_setting('load_term_conditions_section') === 'course' && empty($courseInfo)) {
+                if ('course' === api_get_setting('load_term_conditions_section') && empty($courseInfo)) {
                     $preview = '';
                 }
                 break;
@@ -322,9 +322,9 @@ class LegalManager
             if (strlen($legal[2]) > 2000) {
                 $legal[2] = substr($legal[2], 0, 2000).' ... ';
             }
-            if ($legal[4] == 0) {
+            if (0 == $legal[4]) {
                 $legal[4] = get_lang('HTML');
-            } elseif ($legal[4] == 1) {
+            } elseif (1 == $legal[4]) {
                 $legal[4] = get_lang('Page Link');
             }
             $legals[] = $legal;
@@ -388,7 +388,7 @@ class LegalManager
 
         $extraFieldValue = new ExtraFieldValue('user');
         $value = $extraFieldValue->get_values_by_handler_and_field_variable($userId, 'termactivated');
-        if ($value === false) {
+        if (false === $value) {
             $extraFieldInfo = $extraFieldValue->getExtraField()->get_handler_field_info_by_field_variable('termactivated');
             if ($extraFieldInfo) {
                 $newParams = [
diff --git a/public/main/inc/lib/link.lib.php b/public/main/inc/lib/link.lib.php
index 33f341fd42..fe3c388401 100644
--- a/public/main/inc/lib/link.lib.php
+++ b/public/main/inc/lib/link.lib.php
@@ -101,12 +101,12 @@ class Link extends Model
         $description = trim($description);
 
         // We ensure URL to be absolute.
-        if (strpos($urllink, '://') === false) {
+        if (false === strpos($urllink, '://')) {
             $urllink = 'http://'.$urllink;
         }
 
         // If the title is empty, we use the URL as title.
-        if ($title == '') {
+        if ('' == $title) {
             $title = $urllink;
         }
 
@@ -165,7 +165,7 @@ class Link extends Model
             $repo->getEntityManager()->flush();
             $link_id = $link->getIid();
 
-            if ((api_get_setting('search_enabled') == 'true') &&
+            if (('true' == api_get_setting('search_enabled')) &&
                 $link_id && extension_loaded('xapian')
             ) {
                 require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
@@ -229,7 +229,7 @@ class Link extends Model
                         $course_int_id
                     );
                     $result = Database:: query($sql_cat);
-                    if (Database:: num_rows($result) == 1) {
+                    if (1 == Database:: num_rows($result)) {
                         $row = Database:: fetch_array($result);
                         $ic_slide->addValue(
                             'category',
@@ -299,7 +299,7 @@ class Link extends Model
             $sessionId = api_get_session_id();
         }
         $sessionId = intval($sessionId);
-        if ($linkUrl != '') {
+        if ('' != $linkUrl) {
             $sql = "UPDATE $tblLink SET
                     url = '$linkUrl'
                     WHERE id = $linkId AND c_id = $courseId AND session_id = $sessionId";
@@ -322,6 +322,7 @@ class Link extends Model
 
         if (empty($category_title)) {
             echo Display::return_message(get_lang('Please give the category name'), 'error');
+
             return false;
         }
 
@@ -388,7 +389,7 @@ class Link extends Model
         $repo = Container::getLinkCategoryRepository();
         /** @var CLinkCategory $category */
         $category = $repo->find($id);
-        if ($category)  {
+        if ($category) {
             $repo->delete($category);
             Display::addFlash(Display::return_message(get_lang('The category has been deleted.')));
 
@@ -421,7 +422,8 @@ class Link extends Model
 
     /**
      * Used to delete a link.
-     * @param int    $id
+     *
+     * @param int $id
      *
      * @return bool
      */
@@ -478,7 +480,7 @@ class Link extends Model
     public static function delete_link_from_search_engine($course_id, $link_id)
     {
         // Remove from search engine if enabled.
-        if (api_get_setting('search_enabled') === 'true') {
+        if ('true' === api_get_setting('search_enabled')) {
             $tbl_se_ref = Database::get_main_table(
                 TABLE_MAIN_SEARCH_ENGINE_REF
             );
@@ -548,12 +550,12 @@ class Link extends Model
         $categoryId = intval($values['category_id']);
 
         // We ensure URL to be absolute.
-        if (strpos($values['url'], '://') === false) {
+        if (false === strpos($values['url'], '://')) {
             $values['url'] = 'http://'.$_POST['url'];
         }
 
         // If the title is empty, we use the URL as title.
-        if ($values['title'] == '') {
+        if ('' == $values['title']) {
             $values['title'] = $values['url'];
         }
 
@@ -606,7 +608,7 @@ class Link extends Model
         );
 
         // Update search enchine and its values table if enabled.
-        if (api_get_setting('search_enabled') == 'true') {
+        if ('true' == api_get_setting('search_enabled')) {
             $course_int_id = api_get_course_int_id();
             $course_id = api_get_course_id();
             $link_title = Database:: escape_string($values['title']);
@@ -696,7 +698,7 @@ class Link extends Model
                         $course_int_id
                     );
                     $result = Database:: query($sql_cat);
-                    if (Database:: num_rows($result) == 1) {
+                    if (1 == Database:: num_rows($result)) {
                         $row = Database:: fetch_array($result);
                         $ic_slide->addValue(
                             'category',
@@ -786,7 +788,7 @@ class Link extends Model
      */
     public static function setVisible($id, $scope)
     {
-        if ($scope == TOOL_LINK) {
+        if (TOOL_LINK == $scope) {
             /*api_item_property_update(
                 $_course,
                 TOOL_LINK,
@@ -800,7 +802,7 @@ class Link extends Model
             if ($link) {
                 $repo->setVisibilityPublished($link);
             }
-        } elseif ($scope == TOOL_LINK_CATEGORY) {
+        } elseif (TOOL_LINK_CATEGORY == $scope) {
             $repo = Container::getLinkCategoryRepository();
             /** @var CLink $link */
             $link = $repo->find($id);
@@ -817,16 +819,17 @@ class Link extends Model
         }
         Display::addFlash(Display::return_message(get_lang('The visibility has been changed.')));
     }
+
     public static function setInvisible($id, $scope)
     {
-        if ($scope == TOOL_LINK) {
+        if (TOOL_LINK == $scope) {
             $repo = Container::getLinkRepository();
             /** @var CLink $link */
             $link = $repo->find($id);
             if ($link) {
                 $repo->setVisibilityDraft($link);
             }
-        } elseif ($scope == TOOL_LINK_CATEGORY) {
+        } elseif (TOOL_LINK_CATEGORY == $scope) {
             $repo = Container::getLinkCategoryRepository();
             /** @var CLinkCategory $link */
             $link = $repo->find($id);
@@ -1162,7 +1165,7 @@ class Link extends Model
                             api_get_self().'?'.api_get_cidreq().'&'.http_build_query($moveLinkParams),
                             'level-up-alt',
                             'secondary',
-                            ['class' => 'btn-sm '.($i === 1 ? 'disabled' : '')],
+                            ['class' => 'btn-sm '.(1 === $i ? 'disabled' : '')],
                             false
                         );
 
@@ -1265,7 +1268,7 @@ class Link extends Model
             ).'</a>';
 
         // DISPLAY MOVE UP COMMAND only if it is not the top link.
-        if ($currentCategory != 0) {
+        if (0 != $currentCategory) {
             $tools .= '<a href="'.api_get_self().'?'.api_get_cidreq().'&sec_token='.$token.'&action=up&up='.$categoryId.'&category_id='.$categoryId.'" title="'.get_lang('Up').'">'.
                 Display:: return_icon(
                     'up.png',
@@ -1338,11 +1341,11 @@ Do you really want to delete this category and its links ?')."')) return false;\
         $sessionId = intval($sessionId);
         $thiscatlinkId = intval($catlinkid);
 
-        if ($action == 'down') {
+        if ('down' == $action) {
             $sortDirection = 'DESC';
         }
 
-        if ($action == 'up') {
+        if ('up' == $action) {
             $sortDirection = 'ASC';
         }
 
@@ -1478,14 +1481,14 @@ Do you really want to delete this category and its links ?')."')) return false;\
         $id = '';
 
         //If false try other options
-        if ($pos === false) {
+        if (false === $pos) {
             $url_parsed = parse_url($url);
 
             //Youtube shortener
             //http://youtu.be/ID
             $pos = strpos($url, "youtu.be");
 
-            if ($pos == false) {
+            if (false == $pos) {
                 $id = '';
             } else {
                 return substr($url_parsed['path'], 1);
@@ -1494,7 +1497,7 @@ Do you really want to delete this category and its links ?')."')) return false;\
             //if empty try the youtube.com/embed/ID
             if (empty($id)) {
                 $pos = strpos($url, "embed");
-                if ($pos === false) {
+                if (false === $pos) {
                     return '';
                 } else {
                     return substr($url_parsed['path'], 7);
@@ -1596,7 +1599,7 @@ Do you really want to delete this category and its links ?')."')) return false;\
             }
 
             // Validation when belongs to a session
-            $showChildren = $categoryId == $categoryItemId || $show === 'all';
+            $showChildren = $categoryId == $categoryItemId || 'all' === $show;
             if ($forceOpenCategories) {
                 $showChildren = true;
             }
@@ -1674,7 +1677,7 @@ Do you really want to delete this category and its links ?')."')) return false;\
             '&sec_token='.$token
         );
 
-        if ($action === 'addlink') {
+        if ('addlink' === $action) {
             $form->addHeader(get_lang('LinksAdd'));
         } else {
             $form->addHeader(get_lang('LinksMod'));
@@ -1691,7 +1694,7 @@ Do you really want to delete this category and its links ?')."')) return false;\
             $title = $linkInfo['title'];
             $description = $linkInfo['description'];
             $category = $linkInfo['category_id'];
-            if ($linkInfo['on_homepage'] != 0) {
+            if (0 != $linkInfo['on_homepage']) {
                 $onhomepage = 1;
             }
             $target_link = $linkInfo['target'];
@@ -1739,14 +1742,14 @@ Do you really want to delete this category and its links ?')."')) return false;\
             'target' => $target_link,
         ];
 
-        if (api_get_setting('search_enabled') == 'true') {
+        if ('true' == api_get_setting('search_enabled')) {
             require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
             $specific_fields = get_specific_field_list();
             $form->addCheckBox('index_document', get_lang('Index link title and description?s'), get_lang('Yes'));
 
             foreach ($specific_fields as $specific_field) {
                 $default_values = '';
-                if ($action == 'editlink') {
+                if ('editlink' == $action) {
                     $filter = [
                         'field_id' => $specific_field['id'],
                         'ref_id' => intval($_GET['id']),
@@ -1793,7 +1796,7 @@ Do you really want to delete this category and its links ?')."')) return false;\
         );
 
         $defaults = [];
-        if ($action === 'addcategory') {
+        if ('addcategory' === $action) {
             $form->addHeader(get_lang('Add a category'));
             $my_cat_title = get_lang('Add a category');
         } else {
diff --git a/public/main/inc/lib/login.lib.php b/public/main/inc/lib/login.lib.php
index f66a2ab1ee..12172b43c2 100644
--- a/public/main/inc/lib/login.lib.php
+++ b/public/main/inc/lib/login.lib.php
@@ -11,8 +11,6 @@ use ChamiloSession as Session;
  *
  * @author Olivier Cauberghe <olivier.cauberghe@UGent.be>, Ghent University
  * @author Julio Montoya <gugli100@gmail.com>
- *
- * @package chamilo.login
  */
 class Login
 {
@@ -31,7 +29,7 @@ class Login
 
         if (api_is_multiple_url_enabled()) {
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $url = api_get_access_url($access_url_id);
                 $portal_url = $url['url'];
             }
@@ -109,7 +107,7 @@ class Login
         $portal_url = api_get_path(WEB_PATH);
         if (api_is_multiple_url_enabled()) {
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $url = api_get_access_url($access_url_id);
                 $portal_url = $url['url'];
             }
@@ -125,7 +123,7 @@ class Login
         );
         $email_admin = api_get_setting('emailAdministrator');
 
-        if (api_mail_html('', $email_to, $email_subject, $email_body, $sender_name, $email_admin) == 1) {
+        if (1 == api_mail_html('', $email_to, $email_subject, $email_body, $sender_name, $email_admin)) {
             return get_lang('Your password has been reset');
         } else {
             $admin_email = Display:: encrypted_mailto_link(
@@ -193,7 +191,7 @@ class Login
             $email_admin
         );
 
-        if ($result == 1) {
+        if (1 == $result) {
             return get_lang('Your password has been emailed to you.');
         } else {
             $admin_email = Display:: encrypted_mailto_link(
@@ -272,7 +270,7 @@ class Login
         if ($result && $num_rows > 0) {
             $user = Database::fetch_array($result);
 
-            if ($user['auth_source'] == 'extldap') {
+            if ('extldap' == $user['auth_source']) {
                 return get_lang('Could not reset password');
             }
         } else {
@@ -344,7 +342,7 @@ class Login
                     $_user['status'] = $uData['status'];
 
                     $is_platformAdmin = (bool) (!is_null($uData['is_admin']));
-                    $is_allowedCreateCourse = (bool) (($uData['status'] == 1) or (api_get_setting('drhCourseManagerRights') and $uData['status'] == 4));
+                    $is_allowedCreateCourse = (bool) ((1 == $uData['status']) or (api_get_setting('drhCourseManagerRights') and 4 == $uData['status']));
                     ConditionalLogin::check_conditions($uData);
 
                     Session::write('_user', $_user);
diff --git a/public/main/inc/lib/login_redirection.class.php b/public/main/inc/lib/login_redirection.class.php
index 30b0f8621d..a2fb0f0029 100644
--- a/public/main/inc/lib/login_redirection.class.php
+++ b/public/main/inc/lib/login_redirection.class.php
@@ -15,27 +15,27 @@ class LoginRedirection
         global $param;
         $param = isset($param) ? $param : '';
         $redirect_url = '';
-        if (api_is_student() && !api_get_setting('student_page_after_login') == '') {
+        if (api_is_student() && '' == !api_get_setting('student_page_after_login')) {
             $redirect_url = html_entity_decode(api_get_setting('student_page_after_login'));
-            if ($redirect_url[0] == "/") {
+            if ("/" == $redirect_url[0]) {
                 $redirect_url = substr(api_get_path(WEB_PATH), 0, -1).$redirect_url;
             }
         }
-        if (api_is_teacher() && !api_get_setting('teacher_page_after_login') == '') {
+        if (api_is_teacher() && '' == !api_get_setting('teacher_page_after_login')) {
             $redirect_url = html_entity_decode(api_get_setting('teacher_page_after_login'));
-            if ($redirect_url[0] == "/") {
+            if ("/" == $redirect_url[0]) {
                 $redirect_url = substr(api_get_path(WEB_PATH), 0, -1).$redirect_url;
             }
         }
-        if (api_is_drh() && !api_get_setting('drh_page_after_login') == '') {
+        if (api_is_drh() && '' == !api_get_setting('drh_page_after_login')) {
             $redirect_url = html_entity_decode(api_get_setting('drh_page_after_login'));
-            if ($redirect_url[0] == "/") {
+            if ("/" == $redirect_url[0]) {
                 $redirect_url = substr(api_get_path(WEB_PATH), 0, -1).$redirect_url;
             }
         }
-        if (api_is_session_admin() && !api_get_setting('sessionadmin_page_after_login') == '') {
+        if (api_is_session_admin() && '' == !api_get_setting('sessionadmin_page_after_login')) {
             $redirect_url = html_entity_decode(api_get_setting('sessionadmin_page_after_login'));
-            if ($redirect_url[0] == "/") {
+            if ("/" == $redirect_url[0]) {
                 $redirect_url = substr(api_get_path(WEB_PATH), 0, -1).$redirect_url;
             }
         }
diff --git a/public/main/inc/lib/message.lib.php b/public/main/inc/lib/message.lib.php
index 0cd7d646e2..b74cbf77be 100644
--- a/public/main/inc/lib/message.lib.php
+++ b/public/main/inc/lib/message.lib.php
@@ -10,8 +10,6 @@ use ChamiloSession as Session;
  *
  * This class provides methods for messages management.
  * Include/require it in your code to use its features.
- *
- * @package chamilo.library
  */
 class MessageManager
 {
@@ -34,7 +32,7 @@ class MessageManager
         static $count;
         if (!isset($count)) {
             $cacheAvailable = api_get_configuration_value('apc');
-            if ($cacheAvailable === true) {
+            if (true === $cacheAvailable) {
                 $var = api_get_configuration_value('apc_prefix').'social_messages_unread_u_'.$userId;
                 if (apcu_exists($var)) {
                     $count = apcu_fetch($var);
@@ -213,7 +211,7 @@ class MessageManager
             $title = cut($title, 80, true);
 
             $class = 'class = "read"';
-            if ($status == 1) {
+            if (1 == $status) {
                 $class = 'class = "unread"';
             }
 
@@ -483,7 +481,7 @@ class MessageManager
             $receiverUserInfo = api_get_user_info($receiver_user_id);
 
             // Disabling messages for inactive users.
-            if ($receiverUserInfo['active'] == 0) {
+            if (0 == $receiverUserInfo['active']) {
                 return false;
             }
         }
@@ -607,7 +605,7 @@ class MessageManager
             // Save attachment file for inbox messages
             if (is_array($attachmentList)) {
                 foreach ($attachmentList as $attachment) {
-                    if ($attachment['error'] == 0) {
+                    if (0 == $attachment['error']) {
                         $comment = $attachment['comment'];
                         self::saveMessageAttachmentFile(
                             $attachment,
@@ -622,7 +620,7 @@ class MessageManager
             }
 
             // Save message in the outbox for user friend or group.
-            if (empty($group_id) && $status == MESSAGE_STATUS_UNREAD) {
+            if (empty($group_id) && MESSAGE_STATUS_UNREAD == $status) {
                 $params = [
                     'user_sender_id' => $user_sender_id,
                     'user_receiver_id' => $receiver_user_id,
@@ -639,7 +637,7 @@ class MessageManager
                 // save attachment file for outbox messages
                 if (is_array($attachmentList)) {
                     foreach ($attachmentList as $attachment) {
-                        if ($attachment['error'] == 0) {
+                        if (0 == $attachment['error']) {
                             $comment = $attachment['comment'];
                             self::saveMessageAttachmentFile(
                                 $attachment,
@@ -748,7 +746,7 @@ class MessageManager
         $attachmentList = []
     ) {
         $files = $_FILES ? $_FILES : [];
-        if ($uploadFiles === false) {
+        if (false === $uploadFiles) {
             $files = [];
         }
         // $attachmentList must have: tmp_name, name, size keys
@@ -1265,7 +1263,7 @@ class MessageManager
             $sendDate = $row['col2'];
             $senderId = $row['user_sender_id'];
 
-            if ($request === true) {
+            if (true === $request) {
                 $message[0] = '<input type="checkbox" value='.$messageId.' name="out[]">';
             } else {
                 $message[0] = $messageId;
@@ -1274,7 +1272,7 @@ class MessageManager
             $class = 'class = "read"';
             $title = Security::remove_XSS($title);
             $userInfo = api_get_user_info($senderId);
-            if ($request === true) {
+            if (true === $request) {
                 $message[1] = '<a onclick="show_sent_message('.$messageId.')" href="javascript:void(0)">'.
                     $userInfo['complete_name_with_username'].'</a>';
                 $message[2] = '<a onclick="show_sent_message('.$messageId.')" href="javascript:void(0)">'.str_replace(
@@ -1396,7 +1394,7 @@ class MessageManager
         }
 
         $message_content .= '<tr>';
-        if (api_get_setting('allow_social_tool') === 'true') {
+        if ('true' === api_get_setting('allow_social_tool')) {
             $message_content .= '<div class="row">';
             $message_content .= '<div class="col-md-12">';
             $message_content .= '<ul class="list-message">';
@@ -1456,7 +1454,7 @@ class MessageManager
 		        <div id="message-attach">'.(!empty($files_attachments) ? implode('<br />', $files_attachments) : '').'</div>
 		        <div style="padding: 15px 0px 5px 0px">';
         $social_link = '';
-        if (isset($_GET['f']) && $_GET['f'] == 'social') {
+        if (isset($_GET['f']) && 'social' == $_GET['f']) {
             $social_link = 'f=social';
         }
 
@@ -1557,7 +1555,7 @@ class MessageManager
                 $html .= '<div class="row">';
 
                 $items = $topic['count'];
-                $reply_label = ($items == 1) ? get_lang('Reply') : get_lang('Replies');
+                $reply_label = (1 == $items) ? get_lang('Reply') : get_lang('Replies');
                 $label = '<i class="fa fa-envelope"></i> '.$items.' '.$reply_label;
                 $topic['title'] = trim($topic['title']);
 
@@ -1575,8 +1573,8 @@ class MessageManager
                     ['class' => 'title']
                 );
                 $actions = '';
-                if ($my_group_role == GROUP_USER_PERMISSION_ADMIN ||
-                    $my_group_role == GROUP_USER_PERMISSION_MODERATOR
+                if (GROUP_USER_PERMISSION_ADMIN == $my_group_role ||
+                    GROUP_USER_PERMISSION_MODERATOR == $my_group_role
                 ) {
                     $actions = '<br />'.Display::url(
                             get_lang('Delete'),
@@ -1683,7 +1681,7 @@ class MessageManager
         $links .= '<div class="pull-right">';
         $links .= '<div class="btn-group btn-group-sm">';
 
-        if (($my_group_role == GROUP_USER_PERMISSION_ADMIN || $my_group_role == GROUP_USER_PERMISSION_MODERATOR) ||
+        if ((GROUP_USER_PERMISSION_ADMIN == $my_group_role || GROUP_USER_PERMISSION_MODERATOR == $my_group_role) ||
             $main_message['user_sender_id'] == $current_user_id
         ) {
             $urlEdit = $webCodePath.'social/message_for_group_form.inc.php?'
@@ -1822,8 +1820,8 @@ class MessageManager
 
                 $links .= '<div class="btn-group btn-group-sm">';
                 if (
-                    ($my_group_role == GROUP_USER_PERMISSION_ADMIN ||
-                        $my_group_role == GROUP_USER_PERMISSION_MODERATOR
+                    (GROUP_USER_PERMISSION_ADMIN == $my_group_role ||
+                        GROUP_USER_PERMISSION_MODERATOR == $my_group_role
                     ) ||
                     $topic['user_sender_id'] == $current_user_id
                 ) {
@@ -1921,7 +1919,7 @@ class MessageManager
 
                 $base_padding = 20;
 
-                if ($topic['indent_cnt'] == 0) {
+                if (0 == $topic['indent_cnt']) {
                     $indent = $base_padding;
                 } else {
                     $indent = (int) $topic['indent_cnt'] * $base_padding + $base_padding;
@@ -2071,7 +2069,7 @@ class MessageManager
                 $comment = !empty($comment) ? '&nbsp;-&nbsp;<i>'.$comment.'</i>' : '';
 
                 $attachmentLine = $attachIcon.'&nbsp;'.$link.'&nbsp;('.$size.')'.$comment;
-                if ($row_file['comment'] === 'audio_message') {
+                if ('audio_message' === $row_file['comment']) {
                     $attachmentLine = '<audio src="'.$archiveURL.$archiveFile.'"/>';
                 }
                 $list[] = $attachmentLine;
@@ -2169,7 +2167,7 @@ class MessageManager
         $table->set_header(2, get_lang('Date'), true, ['style' => 'width:180px;']);
         $table->set_header(3, get_lang('Edit'), false, ['style' => 'width:120px;']);
 
-        if (isset($_REQUEST['f']) && $_REQUEST['f'] === 'social') {
+        if (isset($_REQUEST['f']) && 'social' === $_REQUEST['f']) {
             $parameters['f'] = 'social';
             $table->set_additional_parameters($parameters);
         }
@@ -2377,7 +2375,7 @@ class MessageManager
             switch ($_REQUEST['action']) {
                 case 'delete':
                     $count = count($_POST['id']);
-                    if ($count != 0) {
+                    if (0 != $count) {
                         foreach ($_POST['id'] as $index => $messageId) {
                             self::delete_message_by_user_receiver(
                                 api_get_user_id(),
@@ -2452,7 +2450,7 @@ class MessageManager
         $result = Database::query($sql);
 
         $messages = [];
-        if ($result !== false) {
+        if (false !== $result) {
             while ($row = Database::fetch_assoc($result)) {
                 $messages[] = $row;
             }
@@ -2632,7 +2630,7 @@ class MessageManager
         while (!feof($file)) {
             $line = fgets($file);
 
-            if (trim($line) == '') {
+            if ('' == trim($line)) {
                 continue;
             }
 
@@ -2649,7 +2647,7 @@ class MessageManager
             while (!feof($mailFile)) {
                 $mailLine = fgets($mailFile);
                 //if ($iX == 4 && preg_match('/(.*):\s(.*)$/', $mailLine, $matches)) {
-                if ($iX == 2 &&
+                if (2 == $iX &&
                     preg_match('/(.*)(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})\s(.*)/', $mailLine, $detailsMatches)
                 ) {
                     $mail_queue[$i]['reason'] = $detailsMatches[3];
@@ -2882,7 +2880,7 @@ class MessageManager
         );
 
         $btnDislike = '';
-        if (api_get_configuration_value('disable_dislike_option') === false) {
+        if (false === api_get_configuration_value('disable_dislike_option')) {
             $disabled = $countLikes['user_disliked'] ? 'btn-danger' : 'btn-default';
 
             $btnDislike = Display::button(
diff --git a/public/main/inc/lib/model.lib.php b/public/main/inc/lib/model.lib.php
index 5edd65d234..b68fff6643 100644
--- a/public/main/inc/lib/model.lib.php
+++ b/public/main/inc/lib/model.lib.php
@@ -63,7 +63,7 @@ class Model
 
         // Database table definition
         $result = Database::delete($this->table, $params);
-        if ($result != 1) {
+        if (1 != $result) {
             return false;
         }
 
diff --git a/public/main/inc/lib/myspace.lib.php b/public/main/inc/lib/myspace.lib.php
index dc704909d8..321af6111d 100644
--- a/public/main/inc/lib/myspace.lib.php
+++ b/public/main/inc/lib/myspace.lib.php
@@ -484,7 +484,7 @@ class MySpace
         if (api_is_multiple_url_enabled()) {
             $tbl_session_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sqlCoachs = "SELECT DISTINCT
                                     scu.user_id as id_coach,
                                     u.id as user_id,
@@ -523,7 +523,7 @@ class MySpace
         if (api_is_multiple_url_enabled()) {
             $tbl_session_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql_session_coach = "SELECT session.id_coach, u.id as user_id, lastname, firstname, MAX(login_date) as login_date
 					FROM $tbl_user u , $tbl_sessions as session, $tbl_track_login , $tbl_session_rel_access_url as session_rel_url
 					WHERE
@@ -601,15 +601,15 @@ class MySpace
             }
         }
 
-        if ($tracking_column != 3) {
-            if ($tracking_direction == 'DESC') {
+        if (3 != $tracking_column) {
+            if ('DESC' == $tracking_direction) {
                 usort($all_datas, ['MySpace', 'rsort_users']);
             } else {
                 usort($all_datas, ['MySpace', 'sort_users']);
             }
         }
 
-        if ($export_csv && $tracking_column != 3) {
+        if ($export_csv && 3 != $tracking_column) {
             usort($csv_content, 'sort_users');
         }
         if ($export_csv) {
@@ -667,7 +667,7 @@ class MySpace
         $message = '';
         $defaults = [];
         // include the user manager and formvalidator library
-        if (isset($_GET['export']) && $_GET['export'] == 'options') {
+        if (isset($_GET['export']) && 'options' == $_GET['export']) {
             // get all the defined extra fields
             $extrafields = UserManager::get_extra_fields(
                 0,
@@ -714,7 +714,7 @@ class MySpace
                 $message = '';
                 $additionalExportFields = [];
                 foreach ($values as $field_ids => $value) {
-                    if ($value == 1 && strstr($field_ids, 'extra_export_field')) {
+                    if (1 == $value && strstr($field_ids, 'extra_export_field')) {
                         $additionalExportFields[] = str_replace('extra_export_field', '', $field_ids);
                     }
                 }
@@ -918,11 +918,11 @@ class MySpace
                 null,
                 false
             );
-            if ($last_login_date_tmp != false &&
-                $last_login_date == false
+            if (false != $last_login_date_tmp &&
+                false == $last_login_date
             ) { // TODO: To be cleaned
                 $last_login_date = $last_login_date_tmp;
-            } elseif ($last_login_date_tmp != false && $last_login_date != false) {
+            } elseif (false != $last_login_date_tmp && false != $last_login_date) {
                 // TODO: Repeated previous condition. To be cleaned.
                 // Find the max and assign it to first_login_date
                 if (strtotime($last_login_date_tmp) > strtotime($last_login_date)) {
@@ -1110,10 +1110,10 @@ class MySpace
                     null,
                     false
                 );
-                if ($last_login_date_tmp != false && $last_login_date == false) {
+                if (false != $last_login_date_tmp && false == $last_login_date) {
                     // TODO: To be cleaned.
                     $last_login_date = $last_login_date_tmp;
-                } elseif ($last_login_date_tmp != false && $last_login_date == false) {
+                } elseif (false != $last_login_date_tmp && false == $last_login_date) {
                     // TODO: Repeated previous condition. To be cleaned.
                     // Find the max and assign it to first_login_date
                     if (strtotime($last_login_date_tmp) > strtotime($last_login_date)) {
@@ -1252,7 +1252,7 @@ class MySpace
         $numberItems = (int) $numberItems;
         $direction = Database::escape_string($direction);
         $columnName = 'name';
-        if ($column === 1) {
+        if (1 === $column) {
             $columnName = 'id';
         }
 
@@ -1344,10 +1344,10 @@ class MySpace
                     $session_id,
                     false
                 );
-                if ($last_login_date_tmp != false && $last_login_date == false) {
+                if (false != $last_login_date_tmp && false == $last_login_date) {
                     // TODO: To be cleaned.
                     $last_login_date = $last_login_date_tmp;
-                } elseif ($last_login_date_tmp != false && $last_login_date != false) {
+                } elseif (false != $last_login_date_tmp && false != $last_login_date) {
                     // TODO: Repeated previous condition! To be cleaned.
                     // Find the max and assign it to first_login_date
                     if (strtotime($last_login_date_tmp) > strtotime($last_login_date)) {
@@ -1534,10 +1534,10 @@ class MySpace
                         $session_id,
                         false
                     );
-                    if ($last_login_date_tmp != false && $last_login_date == false) {
+                    if (false != $last_login_date_tmp && false == $last_login_date) {
                         // TODO: To be cleaned.
                         $last_login_date = $last_login_date_tmp;
-                    } elseif ($last_login_date_tmp != false && $last_login_date == false) {
+                    } elseif (false != $last_login_date_tmp && false == $last_login_date) {
                         // TODO: Repeated previous condition. To be cleaned.
                         // Find the max and assign it to first_login_date
                         if (strtotime($last_login_date_tmp) > strtotime($last_login_date)) {
@@ -1649,7 +1649,7 @@ class MySpace
         }
 
         $percentage = null;
-        if ($score_possible != 0) {
+        if (0 != $score_possible) {
             $percentage = round(($score_obtained / $score_possible * 100), 2);
         }
 
@@ -1687,7 +1687,7 @@ class MySpace
         } else {
             $orderby = 0;
         }
-        if ($is_western_name_order != api_is_western_name_order() && ($orderby == 1 || $orderby == 2)) {
+        if ($is_western_name_order != api_is_western_name_order() && (1 == $orderby || 2 == $orderby)) {
             // Swapping the sorting column if name order for export is different than the common name order.
             $orderby = 3 - $orderby;
         }
@@ -2008,7 +2008,7 @@ class MySpace
         if (!UserManager::is_username_available($username) || empty($username)) {
             $i = 0;
             while (1) {
-                if ($i == 0) {
+                if (0 == $i) {
                     $sufix = '';
                 } else {
                     $sufix = $i;
@@ -2131,7 +2131,7 @@ class MySpace
                     $user['create'] = '1';
                 } else {
                     $is_session_avail = self::user_available_in_session($user['UserName'], $course_list, $id_session);
-                    if ($is_session_avail == 0) {
+                    if (0 == $is_session_avail) {
                         $user_name = $user['UserName'];
                         $sql_select = "SELECT user_id FROM $table_user WHERE username ='$user_name' ";
                         $rs = Database::query($sql_select);
@@ -2173,7 +2173,7 @@ class MySpace
             $rs = Database::query($sql);
             $creator_id = Database::result($rs, 0, 0);
             // check if we are the creators or not
-            if ($creator_id != '') {
+            if ('' != $creator_id) {
                 if ($creator_id != api_get_user_id()) {
                     $user['error'] = get_lang('User already register by other coach.');
                     $errors[] = $user;
@@ -2196,12 +2196,12 @@ class MySpace
         foreach ($users as $index => $user) {
             // 1. Check whether mandatory fields are set.
             $mandatory_fields = ['LastName', 'FirstName'];
-            if (api_get_setting('registration', 'email') == 'true') {
+            if ('true' == api_get_setting('registration', 'email')) {
                 $mandatory_fields[] = 'Email';
             }
 
             foreach ($mandatory_fields as $key => $field) {
-                if (!isset($user[$field]) || strlen($user[$field]) == 0) {
+                if (!isset($user[$field]) || 0 == strlen($user[$field])) {
                     $user['error'] = get_lang($field.'Mandatory');
                     $errors[] = $user;
                 }
@@ -2230,7 +2230,7 @@ class MySpace
     public static function complete_missing_data($user)
     {
         // 1. Generate a password if it is necessary.
-        if (!isset($user['Password']) || strlen($user['Password']) == 0) {
+        if (!isset($user['Password']) || 0 == strlen($user['Password'])) {
             $user['Password'] = api_generate_password();
         }
 
@@ -2256,7 +2256,7 @@ class MySpace
             $user = self::complete_missing_data($user);
             // coach only will registered users
             $default_status = STUDENT;
-            if ($user['create'] == COURSEMANAGER) {
+            if (COURSEMANAGER == $user['create']) {
                 $user['id'] = UserManager:: create_user(
                     $user['FirstName'],
                     $user['LastName'],
@@ -2345,14 +2345,14 @@ class MySpace
                 );
                 $userInfo = api_get_user_info($user['id']);
 
-                if (($user['added_at_platform'] == 1 && $user['added_at_session'] == 1) || $user['added_at_session'] == 1) {
-                    if ($user['added_at_platform'] == 1) {
+                if ((1 == $user['added_at_platform'] && 1 == $user['added_at_session']) || 1 == $user['added_at_session']) {
+                    if (1 == $user['added_at_platform']) {
                         $addedto = get_lang('User created in portal');
                     } else {
                         $addedto = '          ';
                     }
 
-                    if ($user['added_at_session'] == 1) {
+                    if (1 == $user['added_at_session']) {
                         $addedto .= get_lang('User added into the session');
                     }
                 } else {
@@ -2364,14 +2364,14 @@ class MySpace
         } else {
             foreach ($users as $index => $user) {
                 $userInfo = api_get_user_info($user['id']);
-                if (($user['added_at_platform'] == 1 && $user['added_at_session'] == 1) || $user['added_at_session'] == 1) {
-                    if ($user['added_at_platform'] == 1) {
+                if ((1 == $user['added_at_platform'] && 1 == $user['added_at_session']) || 1 == $user['added_at_session']) {
+                    if (1 == $user['added_at_platform']) {
                         $addedto = get_lang('User created in portal');
                     } else {
                         $addedto = '          ';
                     }
 
-                    if ($user['added_at_session'] == 1) {
+                    if (1 == $user['added_at_session']) {
                         $addedto .= ' '.get_lang('User added into the session');
                     }
                 } else {
@@ -2422,7 +2422,7 @@ class MySpace
         foreach ($crawler as $domElement) {
             $row = [];
             foreach ($domElement->childNodes as $node) {
-                if ($node->nodeName != '#text') {
+                if ('#text' != $node->nodeName) {
                     $row[$node->nodeName] = $node->nodeValue;
                 }
             }
@@ -2804,7 +2804,7 @@ function get_stats($user_id, $course_info, $sessionId, $start_date = null, $end_
     if (!empty($course_info)) {
         $stringStartDate = '';
         $stringEndDate = '';
-        if ($start_date != null && $end_date != null) {
+        if (null != $start_date && null != $end_date) {
             $end_date = add_day_to($end_date);
 
             $start_date = Database::escape_string($start_date);
@@ -2904,7 +2904,7 @@ function grapher($sql_result, $start_date, $end_date, $type = '')
     if (empty($end_date)) {
         $end_date = '';
     }
-    if ($type == '') {
+    if ('' == $type) {
         $type = 'day';
     }
     $main_year = $main_month_year = $main_day = [];
@@ -2959,7 +2959,7 @@ function grapher($sql_result, $start_date, $end_date, $type = '')
         }
 
         $labels = array_keys($main_date);
-        if (count($main_date) == 1) {
+        if (1 == count($main_date)) {
             $labels = $labels[0];
             $main_date = $main_date[$labels];
         }
@@ -2967,7 +2967,7 @@ function grapher($sql_result, $start_date, $end_date, $type = '')
         /* Create and populate the pData object */
         $myData = new pData();
         $myData->addPoints($main_date, 'Serie1');
-        if (count($main_date) != 1) {
+        if (1 != count($main_date)) {
             $myData->addPoints($labels, 'Labels');
             $myData->setSerieDescription('Labels', 'Months');
             $myData->setAbscissa('Labels');
diff --git a/public/main/inc/lib/notebook.lib.php b/public/main/inc/lib/notebook.lib.php
index 3ec5fa5a48..7a94c1e533 100644
--- a/public/main/inc/lib/notebook.lib.php
+++ b/public/main/inc/lib/notebook.lib.php
@@ -8,8 +8,6 @@ use ChamiloSession as Session;
  * Include/require it in your code to use its features.
  *
  * @author Carlos Vargas <litox84@gmail.com>, move code of main/notebook up here
- *
- * @package chamilo.library
  */
 class NotebookManager
 {
@@ -126,7 +124,7 @@ class NotebookManager
                 FROM $table
                 WHERE c_id = $course_id AND notebook_id = '".$notebook_id."' ";
         $result = Database::query($sql);
-        if (Database::num_rows($result) != 1) {
+        if (1 != Database::num_rows($result)) {
             return [];
         }
 
@@ -214,7 +212,7 @@ class NotebookManager
         $result = Database::query($sql);
         $affected_rows = Database::affected_rows($result);
 
-        if ($affected_rows != 1) {
+        if (1 != $affected_rows) {
             return false;
         }
 
@@ -240,7 +238,7 @@ class NotebookManager
         if (!isset($_GET['direction'])) {
             $sort_direction = 'ASC';
             $link_sort_direction = 'DESC';
-        } elseif ($_GET['direction'] == 'ASC') {
+        } elseif ('ASC' == $_GET['direction']) {
             $sort_direction = 'ASC';
             $link_sort_direction = 'DESC';
         } else {
@@ -251,7 +249,7 @@ class NotebookManager
         // action links
         echo '<div class="actions">';
         if (!api_is_anonymous()) {
-            if ($sessionId == 0 || api_is_allowed_to_session_edit(false, true)) {
+            if (0 == $sessionId || api_is_allowed_to_session_edit(false, true)) {
                 echo '<a href="index.php?'.api_get_cidreq().'&action=addnote">'.
                     Display::return_icon('new_note.png', get_lang('Add new note in my personal notebook'), '', '32').'</a>';
             }
@@ -281,7 +279,7 @@ class NotebookManager
         // Condition for the session
         $condition_session = api_get_session_condition($sessionId);
 
-        $cond_extra = $notebookView == 'update_date' ? " AND update_date <> ''" : ' ';
+        $cond_extra = 'update_date' == $notebookView ? " AND update_date <> ''" : ' ';
         $course_id = api_get_course_int_id();
 
         $sql = "SELECT * FROM $table
diff --git a/public/main/inc/lib/notification.lib.php b/public/main/inc/lib/notification.lib.php
index 009a6805cd..00ec211ece 100644
--- a/public/main/inc/lib/notification.lib.php
+++ b/public/main/inc/lib/notification.lib.php
@@ -9,8 +9,6 @@ use Chamilo\CoreBundle\Hook\HookNotificationTitle;
  * Notification class
  * This class provides methods for the Notification management.
  * Include/require it in your code to use its features.
- *
- * @package chamilo.library
  */
 class Notification extends Model
 {
@@ -298,7 +296,7 @@ class Notification extends Model
 
                     // Means that user extra was not set
                     // Then send email now.
-                    if ($userSetting === '') {
+                    if ('' === $userSetting) {
                         $userSetting = self::NOTIFY_MESSAGE_AT_ONCE;
                     }
                 }
@@ -450,7 +448,7 @@ class Notification extends Model
         }
 
         // See message with link text
-        if (!empty($linkToNewMessage) && api_get_setting('allow_message_tool') == 'true') {
+        if (!empty($linkToNewMessage) && 'true' == api_get_setting('allow_message_tool')) {
             $content = $content.'<br /><br />'.$linkToNewMessage;
         }
 
@@ -483,13 +481,13 @@ class Notification extends Model
      */
     public static function sendPushNotification(array $userIds, $title, $content)
     {
-        if (api_get_setting('messaging_allow_send_push_notification') !== 'true') {
+        if ('true' !== api_get_setting('messaging_allow_send_push_notification')) {
             return false;
         }
 
         $gdcApiKey = api_get_setting('messaging_gdc_api_key');
 
-        if ($gdcApiKey === false) {
+        if (false === $gdcApiKey) {
             return false;
         }
 
diff --git a/public/main/inc/lib/online.inc.php b/public/main/inc/lib/online.inc.php
index 241ae04d23..a87d44ed29 100644
--- a/public/main/inc/lib/online.inc.php
+++ b/public/main/inc/lib/online.inc.php
@@ -10,8 +10,6 @@ use ChamiloSession as Session;
  * @author Denes Nagy, principal author
  * @author Bart Mollet
  * @author Roan Embrechts, cleaning and bugfixing
- *
- * @package chamilo.whoisonline
  */
 
 /**
@@ -33,7 +31,7 @@ function LoginCheck($uid)
 
         $login_date = api_get_utc_datetime();
         $access_url_id = 1;
-        if (api_get_multiple_access_url() && api_get_current_access_url_id() != -1) {
+        if (api_get_multiple_access_url() && -1 != api_get_current_access_url_id()) {
             $access_url_id = api_get_current_access_url_id();
         }
         $session_id = api_get_session_id();
@@ -57,7 +55,7 @@ function preventMultipleLogin($userId)
 {
     $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ONLINE);
     $userId = intval($userId);
-    if (api_get_setting('prevent_multiple_simultaneous_login') === 'true') {
+    if ('true' === api_get_setting('prevent_multiple_simultaneous_login')) {
         if (!empty($userId) && !api_is_anonymous()) {
             $isFirstLogin = Session::read('first_user_login');
             if (empty($isFirstLogin)) {
@@ -74,7 +72,7 @@ function preventMultipleLogin($userId)
                 $userIsReallyOnline = user_is_online($userId);
 
                 // Trying double login.
-                if (!empty($loginData) && $userIsReallyOnline == true) {
+                if (!empty($loginData) && true == $userIsReallyOnline) {
                     session_regenerate_id();
                     Session::destroy();
                     header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=multiple_connection_not_allowed');
@@ -149,7 +147,7 @@ function online_logout($user_id = null, $logout_redirect = false)
     // (using *authent_name*_logout as the function name) and the following code
     // will find and execute it
     $uinfo = api_get_user_info($user_id);
-    if (($uinfo['auth_source'] != PLATFORM_AUTH_SOURCE) && is_array($extAuthSource)) {
+    if ((PLATFORM_AUTH_SOURCE != $uinfo['auth_source']) && is_array($extAuthSource)) {
         if (is_array($extAuthSource[$uinfo['auth_source']])) {
             $subarray = $extAuthSource[$uinfo['auth_source']];
             if (!empty($subarray['logout']) && file_exists($subarray['logout'])) {
@@ -165,8 +163,8 @@ function online_logout($user_id = null, $logout_redirect = false)
     // After logout redirect to
     $url = api_get_path(WEB_PATH).'index.php';
 
-    if ($logout_redirect && api_get_plugin_setting('azure_active_directory', 'enable') == 'true') {
-        if (ChamiloSession::read('_user_auth_source') === 'azure_active_directory') {
+    if ($logout_redirect && 'true' == api_get_plugin_setting('azure_active_directory', 'enable')) {
+        if ('azure_active_directory' === ChamiloSession::read('_user_auth_source')) {
             $activeDirectoryPlugin = AzureActiveDirectory::create();
             $azureLogout = $activeDirectoryPlugin->getUrl(AzureActiveDirectory::URL_TYPE_LOGOUT);
             if (!empty($azureLogout)) {
@@ -181,8 +179,8 @@ function online_logout($user_id = null, $logout_redirect = false)
     session_regenerate_id();
     Session::destroy();
 
-    $pluginKeycloak = api_get_plugin_setting('keycloak', 'tool_enable') === 'true';
-    if ($pluginKeycloak && $uinfo['auth_source'] === 'keycloak') {
+    $pluginKeycloak = 'true' === api_get_plugin_setting('keycloak', 'tool_enable');
+    if ($pluginKeycloak && 'keycloak' === $uinfo['auth_source']) {
         $pluginUrl = api_get_path(WEB_PLUGIN_PATH).'keycloak/start.php?slo';
         header('Location: '.$pluginUrl);
         exit;
@@ -303,7 +301,7 @@ function who_is_online(
 
     if (api_get_multiple_access_url()) {
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             if ($friends) {
                 // 	friends from social network is online
                 $query = "SELECT distinct login_user_id, login_date
@@ -385,7 +383,7 @@ function who_is_online_count($time_limit = null, $friends = false)
 
     if (api_get_multiple_access_url()) {
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             if ($friends) {
                 // friends from social network is online
                 $query = "SELECT DISTINCT count(login_user_id) as count
diff --git a/public/main/inc/lib/pdf.lib.php b/public/main/inc/lib/pdf.lib.php
index b66c27c760..371cf8f23a 100644
--- a/public/main/inc/lib/pdf.lib.php
+++ b/public/main/inc/lib/pdf.lib.php
@@ -8,8 +8,6 @@ use Mpdf\Output\Destination;
 
 /**
  * Class PDF.
- *
- * @package chamilo.library
  */
 class PDF
 {
@@ -253,7 +251,7 @@ class PDF
 
             if (empty($file) && !empty($htmlTitle)) {
                 // this is a chapter, print title & skip the rest
-                if ($counter === 2 && !empty($mainTitle)) {
+                if (2 === $counter && !empty($mainTitle)) {
                     $this->pdf->WriteHTML(
                         '<html><body><h2 style="text-align: center">'.$mainTitle.'</h2></body></html>'
                     );
@@ -265,7 +263,7 @@ class PDF
                 }
                 continue;
             } else {
-                if ($counter === 2 && !empty($mainTitle)) {
+                if (2 === $counter && !empty($mainTitle)) {
                     $this->pdf->WriteHTML(
                         '<html><body><h2 style="text-align: center">'.$mainTitle.'</h2></body></html>'
                     );
@@ -296,9 +294,9 @@ class PDF
                 $filename = $file_info['basename'];
                 $filename = str_replace('_', ' ', $filename);
 
-                if ($extension === 'html') {
+                if ('html' === $extension) {
                     $filename = basename($filename, '.html');
-                } elseif ($extension === 'htm') {
+                } elseif ('htm' === $extension) {
                     $filename = basename($filename, '.htm');
                 }
 
@@ -433,10 +431,10 @@ class PDF
                         continue;
                     }
 
-                    if (strpos($old_src, $protocol) === false) {
-                        if (strpos($old_src, '/main/default_course_document') === false) {
-                            if (strpos($old_src, '/main/inc/lib/') === false &&
-                                strpos($old_src, '/app/upload/') === false
+                    if (false === strpos($old_src, $protocol)) {
+                        if (false === strpos($old_src, '/main/default_course_document')) {
+                            if (false === strpos($old_src, '/main/inc/lib/') &&
+                                false === strpos($old_src, '/app/upload/')
                             ) {
                                 $old_src_fixed = str_replace(
                                     api_get_path(REL_COURSE_PATH).$courseInfo['path'].'/document/',
@@ -498,7 +496,7 @@ class PDF
             $output_file = $pdf_name.'.pdf';
         }
 
-        if ($outputMode == 'F') {
+        if ('F' == $outputMode) {
             $output_file = api_get_path(SYS_ARCHIVE_PATH).$output_file;
         }
 
@@ -516,7 +514,7 @@ class PDF
             ); // F to save the pdf in a file
         }
 
-        if ($outputMode != 'F') {
+        if ('F' != $outputMode) {
             exit;
         }
 
@@ -535,7 +533,7 @@ class PDF
     {
         $web_path = false;
         $urlId = api_get_current_access_url_id();
-        if (!empty($courseCode) && api_get_setting('pdf_export_watermark_by_course') == 'true') {
+        if (!empty($courseCode) && 'true' == api_get_setting('pdf_export_watermark_by_course')) {
             $course_info = api_get_course_info($courseCode);
             // course path
             $store_path = api_get_path(SYS_COURSE_PATH).$course_info['path'].'/'.$urlId.'_pdf_watermark.png';
@@ -564,7 +562,7 @@ class PDF
     public function delete_watermark($courseCode = null)
     {
         $urlId = api_get_current_access_url_id();
-        if (!empty($courseCode) && api_get_setting('pdf_export_watermark_by_course') == 'true') {
+        if (!empty($courseCode) && 'true' == api_get_setting('pdf_export_watermark_by_course')) {
             $course_info = api_get_course_info($courseCode);
             // course path
             $store_path = api_get_path(SYS_COURSE_PATH).$course_info['path'].'/'.$urlId.'_pdf_watermark.png';
@@ -593,7 +591,7 @@ class PDF
     public function upload_watermark($filename, $source_file, $courseCode = null)
     {
         $urlId = api_get_current_access_url_id();
-        if (!empty($courseCode) && api_get_setting('pdf_export_watermark_by_course') == 'true') {
+        if (!empty($courseCode) && 'true' == api_get_setting('pdf_export_watermark_by_course')) {
             $course_info = api_get_course_info($courseCode);
             $store_path = api_get_path(SYS_COURSE_PATH).$course_info['path']; // course path
             $web_path = api_get_path(WEB_COURSE_PATH).$course_info['path'].'/pdf_watermark.png';
@@ -674,7 +672,7 @@ class PDF
             $organization = ChamiloApi::getPlatformLogo('', [], true);
             // Use custom logo image.
             $pdfLogo = api_get_setting('pdf_logo_header');
-            if ($pdfLogo === 'true') {
+            if ('true' === $pdfLogo) {
                 $visualTheme = api_get_visual_theme();
                 $img = api_get_path(SYS_CSS_PATH).'themes/'.$visualTheme.'/images/pdf_logo_header.png';
                 if (file_exists($img)) {
@@ -739,7 +737,7 @@ class PDF
         // Add decoration only if not stated otherwise
         if ($complete) {
             // Adding watermark
-            if (api_get_setting('pdf_export_watermark_enable') == 'true') {
+            if ('true' == api_get_setting('pdf_export_watermark_enable')) {
                 $watermark_file = self::get_watermark($courseCode);
                 if ($watermark_file) {
                     //http://mpdf1.com/manual/index.php?tid=269&searchstring=watermark
@@ -918,7 +916,7 @@ class PDF
             $src = $element->getAttribute('src');
             $src = trim($src);
 
-            if (strpos($src, $protocol) !== false) {
+            if (false !== strpos($src, $protocol)) {
                 continue;
             }
 
@@ -927,7 +925,7 @@ class PDF
                 continue;
             }
 
-            if (strpos($src, '/main/default_course_document') === 0) {
+            if (0 === strpos($src, '/main/default_course_document')) {
                 $element->setAttribute(
                     'src',
                     str_replace('/main/default_course_document', $sysCodePath.'default_course_document', $src)
@@ -935,7 +933,7 @@ class PDF
                 continue;
             }
 
-            if (strpos($src, '/main/img') === 0) {
+            if (0 === strpos($src, '/main/img')) {
                 $element->setAttribute(
                     'src',
                     str_replace('/main/img/', $sysCodePath.'img/', $src)
@@ -943,7 +941,7 @@ class PDF
                 continue;
             }
 
-            if (strpos($src, '/app/upload/') === 0) {
+            if (0 === strpos($src, '/app/upload/')) {
                 $element->setAttribute(
                     'src',
                     str_replace('/app/upload/', $sysUploadPath, $src)
@@ -955,7 +953,7 @@ class PDF
                 continue;
             }
 
-            if (api_get_path(REL_PATH) != '/') {
+            if ('/' != api_get_path(REL_PATH)) {
                 $oldSrcFixed = str_replace(
                     api_get_path(REL_PATH).'courses/'.$courseInfo['path'].'/document/',
                     '',
@@ -970,7 +968,7 @@ class PDF
                     }
                 }
             } else {
-                if (strpos($src, 'courses/'.$courseInfo['path'].'/document/') !== false) {
+                if (false !== strpos($src, 'courses/'.$courseInfo['path'].'/document/')) {
                     $oldSrcFixed = str_replace('courses/'.$courseInfo['path'].'/document/', '', $src);
                 } else {
                     // Try with the dirname if exists
diff --git a/public/main/inc/lib/plugin.class.php b/public/main/inc/lib/plugin.class.php
index e9b1a664c9..0610afdace 100644
--- a/public/main/inc/lib/plugin.class.php
+++ b/public/main/inc/lib/plugin.class.php
@@ -206,7 +206,7 @@ class Plugin
         if ($checkboxNames = array_keys($this->fields, 'checkbox')) {
             $pluginInfoCollection = api_get_settings('Plugins');
             foreach ($pluginInfoCollection as $pluginInfo) {
-                if (array_search($pluginInfo['title'], $checkboxNames) !== false) {
+                if (false !== array_search($pluginInfo['title'], $checkboxNames)) {
                     $checkboxCollection[$pluginInfo['title']] = $pluginInfo;
                 }
             }
@@ -214,7 +214,7 @@ class Plugin
 
         foreach ($this->fields as $name => $type) {
             $options = null;
-            if (is_array($type) && isset($type['type']) && $type['type'] === 'select') {
+            if (is_array($type) && isset($type['type']) && 'select' === $type['type']) {
                 $attributes = isset($type['attributes']) ? $type['attributes'] : [];
                 if (!empty($type['options']) && isset($type['translate_options']) && $type['translate_options']) {
                     foreach ($type['options'] as $key => &$optionName) {
@@ -232,7 +232,7 @@ class Plugin
             $help = null;
             if ($this->get_lang_plugin_exists($name.'_help')) {
                 $help = $this->get_lang($name.'_help');
-                if ($name === "show_main_menu_tab") {
+                if ("show_main_menu_tab" === $name) {
                     $pluginName = strtolower(str_replace('Plugin', '', get_class($this)));
                     $pluginUrl = api_get_path(WEB_PATH)."plugin/$pluginName/index.php";
                     $pluginUrl = "<a href=$pluginUrl>$pluginUrl</a>";
@@ -271,7 +271,7 @@ class Plugin
                 case 'checkbox':
                     $selectedValue = null;
                     if (isset($checkboxCollection[$name])) {
-                        if ($checkboxCollection[$name]['selected_value'] === 'true') {
+                        if ('true' === $checkboxCollection[$name]['selected_value']) {
                             $selectedValue = 'checked';
                         }
                     }
@@ -526,7 +526,7 @@ class Plugin
         }
 
         // Stop here if we don't want a tool link on the course homepage
-        if (!$add_tool_link || $this->addCourseTool == false) {
+        if (!$add_tool_link || false == $this->addCourseTool) {
             return true;
         }
 
@@ -754,9 +754,9 @@ class Plugin
                 foreach ($tabs as $row) {
                     $newSubKey = "custom_tab_$i";
 
-                    if (strpos($row['subkey'], self::TAB_FILTER_NO_STUDENT) !== false) {
+                    if (false !== strpos($row['subkey'], self::TAB_FILTER_NO_STUDENT)) {
                         $newSubKey .= self::TAB_FILTER_NO_STUDENT;
-                    } elseif (strpos($row['subkey'], self::TAB_FILTER_ONLY_STUDENT) !== false) {
+                    } elseif (false !== strpos($row['subkey'], self::TAB_FILTER_ONLY_STUDENT)) {
                         $newSubKey .= self::TAB_FILTER_ONLY_STUDENT;
                     }
 
@@ -800,7 +800,7 @@ class Plugin
         $pluginName = strtolower($langString);
         $pluginUrl = 'plugin/'.$pluginName.'/'.$filePath;
 
-        if ($showTab === 'true') {
+        if ('true' === $showTab) {
             $tabAdded = $this->addTab($langString, $pluginUrl);
             if ($tabAdded) {
                 // The page must be refreshed to show the recently created tab
@@ -859,7 +859,7 @@ class Plugin
                 ],
             ]
         );
-        if (is_array($settings) && isset($settings['selected_value']) && $settings['selected_value'] == 'installed') {
+        if (is_array($settings) && isset($settings['selected_value']) && 'installed' == $settings['selected_value']) {
             return true;
         }
 
diff --git a/public/main/inc/lib/plugin.lib.php b/public/main/inc/lib/plugin.lib.php
index 6fa29f979a..1c4b4c55d6 100644
--- a/public/main/inc/lib/plugin.lib.php
+++ b/public/main/inc/lib/plugin.lib.php
@@ -64,7 +64,7 @@ class AppPlugin
         $plugins = [];
         $handle = @opendir($pluginPath);
         while (false !== ($file = readdir($handle))) {
-            if ($file != '.' && $file != '..' && is_dir(api_get_path(SYS_PLUGIN_PATH).$file)) {
+            if ('.' != $file && '..' != $file && is_dir(api_get_path(SYS_PLUGIN_PATH).$file)) {
                 $plugins[] = $file;
             }
         }
@@ -142,13 +142,13 @@ class AppPlugin
     {
         static $installedPlugins = null;
 
-        if ($fromDatabase === false) {
+        if (false === $fromDatabase) {
             if (is_array($installedPlugins)) {
                 return $installedPlugins;
             }
         }
 
-        if ($fromDatabase || $installedPlugins === null) {
+        if ($fromDatabase || null === $installedPlugins) {
             $installedPlugins = [];
             $plugins = api_get_settings_params(
                 [
@@ -280,7 +280,7 @@ class AppPlugin
      */
     public function loadRegion($pluginName, $region, $template, $forced = false)
     {
-        if ($region == 'course_tool_plugin') {
+        if ('course_tool_plugin' == $region) {
             return '';
         }
 
@@ -317,7 +317,7 @@ class AppPlugin
         }
 
         // 2. Loading the system language
-        if ($language_interface != 'english') {
+        if ('english' != $language_interface) {
             $path = $root.$plugin_name."/lang/$language_interface.php";
             if (is_readable($path)) {
                 include $path;
@@ -626,10 +626,10 @@ class AppPlugin
 
                 $groups = [];
                 foreach ($obj->course_settings as $setting) {
-                    if ($obj->validateCourseSetting($setting['name']) === false) {
+                    if (false === $obj->validateCourseSetting($setting['name'])) {
                         continue;
                     }
-                    if ($setting['type'] != 'checkbox') {
+                    if ('checkbox' != $setting['type']) {
                         $form->addElement($setting['type'], $setting['name'], $obj->get_lang($setting['name']));
                     } else {
                         $element = &$form->createElement(
@@ -638,7 +638,7 @@ class AppPlugin
                             '',
                             $obj->get_lang($setting['name'])
                         );
-                        if (isset($setting['init_value']) && $setting['init_value'] == 1) {
+                        if (isset($setting['init_value']) && 1 == $setting['init_value']) {
                             $element->setChecked(true);
                         }
                         $form->addElement($element);
diff --git a/public/main/inc/lib/promotion.lib.php b/public/main/inc/lib/promotion.lib.php
index aac05c816f..cd7f0c13b2 100644
--- a/public/main/inc/lib/promotion.lib.php
+++ b/public/main/inc/lib/promotion.lib.php
@@ -5,8 +5,6 @@
  * Class Promotion
  * This class provides methods for the promotion management.
  * Include/require it in your code to use its features.
- *
- * @package chamilo.library
  */
 class Promotion extends Model
 {
@@ -223,7 +221,7 @@ class Promotion extends Model
         $form = new FormValidator('promotion', 'post', $url);
         // Setting the form elements
         $header = get_lang('Add');
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $header = get_lang('Edit');
         }
 
@@ -262,11 +260,11 @@ class Promotion extends Model
         );
         $status_list = $this->get_status_list();
         $form->addElement('select', 'status', get_lang('Status'), $status_list);
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $form->addElement('text', 'created_at', get_lang('Created at'));
             $form->freeze('created_at');
         }
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $form->addButtonSave(get_lang('Edit'), 'submit');
         } else {
             $form->addButtonCreate(get_lang('Add'), 'submit');
diff --git a/public/main/inc/lib/redirect.class.php b/public/main/inc/lib/redirect.class.php
index 727f783116..28727ba463 100644
--- a/public/main/inc/lib/redirect.class.php
+++ b/public/main/inc/lib/redirect.class.php
@@ -34,7 +34,7 @@ class Redirect
             self::navigate($www);
         }
 
-        $is_full_uri = (strpos($url, 'http') === 0);
+        $is_full_uri = (0 === strpos($url, 'http'));
         if ($is_full_uri) {
             self::navigate($url);
         }
@@ -116,7 +116,7 @@ class Redirect
                 }
             }
             $redirect = api_get_setting('redirect_admin_to_courses_list');
-            if ($redirect !== 'true') {
+            if ('true' !== $redirect) {
                 // If the user is a platform admin, redirect to the main admin page
                 if (api_is_multiple_url_enabled()) {
                     // if multiple URLs are enabled, make sure he's admin of the
diff --git a/public/main/inc/lib/search/ChamiloIndexer.class.php b/public/main/inc/lib/search/ChamiloIndexer.class.php
index 2b01740988..3270f9bcd7 100644
--- a/public/main/inc/lib/search/ChamiloIndexer.class.php
+++ b/public/main/inc/lib/search/ChamiloIndexer.class.php
@@ -36,8 +36,8 @@ class ChamiloIndexer extends XapianIndexer
         $stored_terms = $this->get_terms_on_db($prefix, $course_code, $tool_id, $ref_id_high_level);
 
         // don't do anything if no change, verify only at DB, not the search engine
-        if ((count(array_diff($terms, $stored_terms)) == 0) &&
-            (count(array_diff($stored_terms, $terms)) == 0)
+        if ((0 == count(array_diff($terms, $stored_terms))) &&
+            (0 == count(array_diff($stored_terms, $terms)))
         ) {
             return false;
         }
diff --git a/public/main/inc/lib/search/ChamiloQuery.php b/public/main/inc/lib/search/ChamiloQuery.php
index a5bef71bf1..31a097d702 100644
--- a/public/main/inc/lib/search/ChamiloQuery.php
+++ b/public/main/inc/lib/search/ChamiloQuery.php
@@ -3,8 +3,6 @@
 
 /**
  * Script defining generic functions against a search engine api. Just only if one day the search engine changes.
- *
- * @package chamilo.include.search
  */
 require 'xapian/XapianQuery.php';
 
diff --git a/public/main/inc/lib/search/IndexableChunk.class.php b/public/main/inc/lib/search/IndexableChunk.class.php
index 0c6f50b7c3..0486df79e9 100644
--- a/public/main/inc/lib/search/IndexableChunk.class.php
+++ b/public/main/inc/lib/search/IndexableChunk.class.php
@@ -71,7 +71,7 @@ abstract class _IndexableChunk
     public function addTerm($term, $flag)
     {
         global $charset;
-        if (strlen($flag) == 1) {
+        if (1 == strlen($flag)) {
             $this->terms[] = ['name' => api_convert_encoding(stripslashes($term), 'UTF-8', $charset), 'flag' => $flag];
         }
     }
@@ -79,8 +79,6 @@ abstract class _IndexableChunk
 
 /**
  * Extension of the _IndexableChunk class to make IndexableChunk extensible.
- *
- * @package chamilo.include.search
  */
 class IndexableChunk extends _IndexableChunk
 {
diff --git a/public/main/inc/lib/search/get_terms.php b/public/main/inc/lib/search/get_terms.php
index 403bb0bd18..7f307655e5 100644
--- a/public/main/inc/lib/search/get_terms.php
+++ b/public/main/inc/lib/search/get_terms.php
@@ -4,8 +4,6 @@
 /**
  * This script retrieves a list of terms that have xapian documents
  * related with the term passed.
- *
- * @package chamilo.include.search
  */
 $terms_list = [];
 
@@ -55,11 +53,11 @@ $operator = $_GET['operator'];
 $specific_fields = get_specific_field_list();
 $sf_terms = [];
 
-if (($cid = api_get_course_id()) != -1) { // with cid
+if (-1 != ($cid = api_get_course_id())) { // with cid
     // course filter
     $filter[] = chamilo_get_boolean_query(XAPIAN_PREFIX_COURSEID.$cid);
     // term filter
-    if ($term != '__all__') {
+    if ('__all__' != $term) {
         $filter[] = chamilo_get_boolean_query($prefix.$term);
         // always and between term and courseid
         $filter = chamilo_join_queries($filter, null, 'and');
@@ -67,7 +65,7 @@ if (($cid = api_get_course_id()) != -1) { // with cid
 
     $sf_terms = get_usual_sf_terms($filter, $specific_fields);
 } else { // without cid
-    if ($term != '__all__') {
+    if ('__all__' != $term) {
         $filter[] = chamilo_get_boolean_query($prefix.$term);
 
         $sf_terms = get_usual_sf_terms($filter, $specific_fields);
@@ -86,7 +84,7 @@ if (($cid = api_get_course_id()) != -1) { // with cid
 // build array to return
 foreach ($sf_terms as $sf_prefix => $term_group) {
     //if (count($tem_group) > 0) {
-    $first_term = ['__all__' => ($operator == 'or' ? '-- Any --' : '-- All -- ')];
+    $first_term = ['__all__' => ('or' == $operator ? '-- Any --' : '-- All -- ')];
     //}
     if ($sf_prefix != $prefix) {
         $terms_list[] = [
diff --git a/public/main/inc/lib/search/search_widget.php b/public/main/inc/lib/search/search_widget.php
index 138a6b4e80..88a427a49d 100644
--- a/public/main/inc/lib/search/search_widget.php
+++ b/public/main/inc/lib/search/search_widget.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Search widget. Shows the search screen contents.
- *
- * @package chamilo.include.search
  */
 require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
 
@@ -38,9 +36,9 @@ function format_one_specific_field_select($prefix, $sf_term_array, $op, $extra_s
             $all_selected = 'selected="selected"';
         }
     }
-    if ($op == 'and') {
+    if ('and' == $op) {
         $all_selected_name = get_lang('All');
-    } elseif ($op == 'or') {
+    } elseif ('or' == $op) {
         $all_selected_name = get_lang('Any');
     }
     $multiple_select .= '<option value="__all__" '.$all_selected.' >-- '.$all_selected_name.' --</option>';
@@ -115,7 +113,7 @@ function search_widget_normal_form($action, $show_thesaurus, $sf_terms, $op)
 {
     $thesaurus_icon = Display::return_icon('thesaurus.gif', get_lang('Advanced search options'), ['id' => 'thesaurus-icon']);
     $advanced_options = '<a id="tags-toggle" href="#">'.get_lang('Advanced search options').'</a>';
-    $display_thesaurus = ($show_thesaurus == true ? 'block' : 'none');
+    $display_thesaurus = (true == $show_thesaurus ? 'block' : 'none');
     $help = '<h3>'.get_lang('Keywords search help').'</h3>'.get_lang('Select keywords in one or more fields and click the search button.<br /><br />To select more than one keyword in a field, use Ctrl+click.');
     $mode = (!empty($_REQUEST['mode']) ? htmlentities($_REQUEST['mode']) : 'gallery');
     $type = (!empty($_REQUEST['type']) ? htmlentities($_REQUEST['type']) : 'normal');
@@ -125,12 +123,12 @@ function search_widget_normal_form($action, $show_thesaurus, $sf_terms, $op)
      * SortableTableFromArray pagination is done with simple links, so now we
      * could not send a form in pagination.
      */
-    if (isset($_GET['action']) && strcmp(trim($_GET['action']), 'search') === 0) {
+    if (isset($_GET['action']) && 0 === strcmp(trim($_GET['action']), 'search')) {
         $action = 'index.php';
     }
     $navigator_info = api_get_navigator();
 
-    if ($navigator_info['name'] == 'Internet Explorer' && $navigator_info['version'] == '6') {
+    if ('Internet Explorer' == $navigator_info['name'] && '6' == $navigator_info['version']) {
         $submit_button1 = '<input type="submit" id="submit" value="'.get_lang('Search').'" />';
         $submit_button2 = '<input class="lower-submit" type="submit" value="'.get_lang('Search').'" />';
         $reset_button = '<input type="submit" id="tags-clean" value="'.get_lang('Reset keywords').'" />';
@@ -160,9 +158,9 @@ function search_widget_normal_form($action, $show_thesaurus, $sf_terms, $op)
         $form .= format_specific_fields_selects($sf_terms, $op);
         $or_checked = '';
         $and_checked = '';
-        if ($op == 'or') {
+        if ('or' == $op) {
             $or_checked = 'checked="checked"';
-        } elseif ($op == 'and') {
+        } elseif ('and' == $op) {
             $and_checked = 'checked="checked"';
         }
         $form .= '</tr>
@@ -202,7 +200,7 @@ function search_widget_prefilter_form(
 ) {
     $thesaurus_icon = Display::return_icon('thesaurus.gif', get_lang('Advanced search options'), ['id' => 'thesaurus-icon']);
     $advanced_options = '<a id="tags-toggle" href="#">'.get_lang('Advanced search options').'</a>';
-    $display_thesaurus = ($show_thesaurus == true ? 'block' : 'none');
+    $display_thesaurus = (true == $show_thesaurus ? 'block' : 'none');
     $help = '<h3>'.get_lang('Keywords search help').'</h3>'.get_lang('Select keywords in one or more fields and click the search button.<br /><br />To select more than one keyword in a field, use Ctrl+click.');
     $mode = (!empty($_REQUEST['mode']) ? htmlentities($_REQUEST['mode']) : 'gallery');
     $type = (!empty($_REQUEST['type']) ? htmlentities($_REQUEST['type']) : 'normal');
@@ -212,7 +210,7 @@ function search_widget_prefilter_form(
      * SortableTableFromArray pagination is done with simple links, so now we
      * could not send a form in pagination.
      */
-    if (isset($_GET['action']) && strcmp(trim($_GET['action']), 'search') === 0) {
+    if (isset($_GET['action']) && 0 === strcmp(trim($_GET['action']), 'search')) {
         $action = 'index.php';
     }
 
@@ -254,9 +252,9 @@ function search_widget_prefilter_form(
         }
         $or_checked = '';
         $and_checked = '';
-        if ($op == 'or') {
+        if ('or' == $op) {
             $or_checked = 'checked="checked"';
-        } elseif ($op == 'and') {
+        } elseif ('and' == $op) {
             $and_checked = 'checked="checked"';
         }
         $form .= '
@@ -338,7 +336,7 @@ function search_widget_show($action = 'index.php')
     $specific_fields = get_specific_field_list();
     $url_params = [];
 
-    if (($cid = api_get_course_id()) != -1) { // with cid
+    if (-1 != ($cid = api_get_course_id())) { // with cid
         // get search engine terms
         $course_filter = chamilo_get_boolean_query(XAPIAN_PREFIX_COURSEID.$cid);
         $dkterms = chamilo_query_simple_query('', 0, 1000, [$course_filter]);
@@ -367,7 +365,7 @@ function search_widget_show($action = 'index.php')
 
     // Tool introduction
     // TODO: Settings for the online editor to be checked (insert an image for example). Probably this is a special case here.
-    if (api_get_course_id() !== -1) {
+    if (-1 !== api_get_course_id()) {
         if (!empty($groupId)) {
             Display::display_introduction_section(TOOL_SEARCH.$groupId);
         } else {
diff --git a/public/main/inc/lib/search/tool_processors/document_processor.class.php b/public/main/inc/lib/search/tool_processors/document_processor.class.php
index e1f9b62b93..49889a577d 100644
--- a/public/main/inc/lib/search/tool_processors/document_processor.class.php
+++ b/public/main/inc/lib/search/tool_processors/document_processor.class.php
@@ -3,8 +3,6 @@
 
 /**
  * Process documents before pass it to search listing scripts.
- *
- * @package chamilo.include.search
  */
 class document_processor extends search_processor
 {
@@ -17,7 +15,7 @@ class document_processor extends search_processor
     {
         $results = [];
         foreach ($this->rows as $row_val) {
-            $search_show_unlinked_results = (api_get_setting('search_show_unlinked_results') == 'true');
+            $search_show_unlinked_results = ('true' == api_get_setting('search_show_unlinked_results'));
             $course_visible_for_user = api_is_course_visible_for_user(null, $row_val['courseid']);
             // can view course?
             if ($course_visible_for_user || $search_show_unlinked_results) {
diff --git a/public/main/inc/lib/search/tool_processors/learnpath_processor.class.php b/public/main/inc/lib/search/tool_processors/learnpath_processor.class.php
index a83996a07f..dfaf2bc8d8 100644
--- a/public/main/inc/lib/search/tool_processors/learnpath_processor.class.php
+++ b/public/main/inc/lib/search/tool_processors/learnpath_processor.class.php
@@ -3,8 +3,6 @@
 
 /**
  * Process learning paths before pass it to search listing scripts.
- *
- * @package chamilo.include.search
  */
 class learnpath_processor extends search_processor
 {
@@ -38,7 +36,7 @@ class learnpath_processor extends search_processor
     {
         $results = [];
         foreach ($this->learnpaths as $courseid => $learnpaths) {
-            $search_show_unlinked_results = api_get_setting('search_show_unlinked_results') == 'true';
+            $search_show_unlinked_results = 'true' == api_get_setting('search_show_unlinked_results');
             $course_visible_for_user = api_is_course_visible_for_user(null, $courseid);
             // can view course?
             if ($course_visible_for_user || $search_show_unlinked_results) {
diff --git a/public/main/inc/lib/search/tool_processors/link_processor.class.php b/public/main/inc/lib/search/tool_processors/link_processor.class.php
index 2fed0fccff..ff5d90fc85 100644
--- a/public/main/inc/lib/search/tool_processors/link_processor.class.php
+++ b/public/main/inc/lib/search/tool_processors/link_processor.class.php
@@ -3,8 +3,6 @@
 
 /**
  * Process links before pass it to search listing scripts.
- *
- * @package chamilo.include.search
  */
 class link_processor extends search_processor
 {
@@ -34,7 +32,7 @@ class link_processor extends search_processor
         $results = [];
         foreach ($this->links as $courseCode => $one_course_links) {
             $course_info = api_get_course_info($courseCode);
-            $search_show_unlinked_results = (api_get_setting('search_show_unlinked_results') == 'true');
+            $search_show_unlinked_results = ('true' == api_get_setting('search_show_unlinked_results'));
             $course_visible_for_user = api_is_course_visible_for_user(null, $courseCode);
             // can view course?
             if ($course_visible_for_user || $search_show_unlinked_results) {
diff --git a/public/main/inc/lib/search/tool_processors/quiz_processor.class.php b/public/main/inc/lib/search/tool_processors/quiz_processor.class.php
index 009e2cabd0..7d8eae9460 100644
--- a/public/main/inc/lib/search/tool_processors/quiz_processor.class.php
+++ b/public/main/inc/lib/search/tool_processors/quiz_processor.class.php
@@ -3,8 +3,6 @@
 
 /**
  * Process exercises before pass it to search listing scripts.
- *
- * @package chamilo.include.search
  */
 class quiz_processor extends search_processor
 {
@@ -53,7 +51,7 @@ class quiz_processor extends search_processor
     {
         $results = [];
         foreach ($this->exercises as $courseid => $exercises) {
-            $search_show_unlinked_results = (api_get_setting('search_show_unlinked_results') == 'true');
+            $search_show_unlinked_results = ('true' == api_get_setting('search_show_unlinked_results'));
             $course_visible_for_user = api_is_course_visible_for_user(null, $courseid);
             // can view course?
             if ($course_visible_for_user || $search_show_unlinked_results) {
diff --git a/public/main/inc/lib/search/tool_processors/search_processor.class.php b/public/main/inc/lib/search/tool_processors/search_processor.class.php
index 457cbc4524..def4ced9e7 100644
--- a/public/main/inc/lib/search/tool_processors/search_processor.class.php
+++ b/public/main/inc/lib/search/tool_processors/search_processor.class.php
@@ -1,9 +1,6 @@
 <?php
 
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.include.search
- */
 
 /**
  * Base class to make tool processors.
@@ -15,8 +12,6 @@
  * Classes that extends this one should be named like: TOOL_<toolname> on
  * TOOL_<toolname>.class.php
  * See lp_list_search for an example of calling the process.
- *
- * @package chamilo.include.search
  */
 abstract class search_processor
 {
diff --git a/public/main/inc/lib/search/xapian/XapianIndexer.class.php b/public/main/inc/lib/search/xapian/XapianIndexer.class.php
index 665f2ea396..548ecf279f 100644
--- a/public/main/inc/lib/search/xapian/XapianIndexer.class.php
+++ b/public/main/inc/lib/search/xapian/XapianIndexer.class.php
@@ -74,14 +74,14 @@ abstract class XapianIndexer
      */
     public function connectDb($path = null, $dbMode = null, $lang = 'english')
     {
-        if ($this->db != null) {
+        if (null != $this->db) {
             return $this->db;
         }
-        if ($dbMode == null) {
+        if (null == $dbMode) {
             $dbMode = Xapian::DB_CREATE_OR_OPEN;
         }
 
-        if ($path == null) {
+        if (null == $path) {
             $path = api_get_path(SYS_UPLOAD_PATH).'plugins/xapian/searchdb/';
         }
 
@@ -172,7 +172,7 @@ abstract class XapianIndexer
      */
     public function get_document($did)
     {
-        if ($this->db == null) {
+        if (null == $this->db) {
             $this->connectDb();
         }
         try {
@@ -194,7 +194,7 @@ abstract class XapianIndexer
      */
     public function get_document_data($doc)
     {
-        if ($this->db == null) {
+        if (null == $this->db) {
             $this->connectDb();
         }
         try {
@@ -223,7 +223,7 @@ abstract class XapianIndexer
     public function update_terms($did, $terms, $prefix)
     {
         $doc = $this->get_document($did);
-        if ($doc === false) {
+        if (false === $doc) {
             return false;
         }
         $doc->clear_terms();
@@ -244,13 +244,13 @@ abstract class XapianIndexer
      */
     public function remove_document($did)
     {
-        if ($this->db == null) {
+        if (null == $this->db) {
             $this->connectDb();
         }
         $did = (int) $did;
         if ($did > 0) {
             $doc = $this->get_document($did);
-            if ($doc !== false) {
+            if (false !== $doc) {
                 $this->db->delete_document($did);
                 $this->db->flush();
             }
@@ -314,7 +314,7 @@ abstract class XapianIndexer
         if (!is_a($doc, 'XapianDocument')) {
             return false;
         }
-        if ($this->db == null) {
+        if (null == $this->db) {
             $this->connectDb();
         }
         try {
diff --git a/public/main/inc/lib/search/xapian/XapianQuery.php b/public/main/inc/lib/search/xapian/XapianQuery.php
index ed85f7dab0..2d9e333c26 100644
--- a/public/main/inc/lib/search/xapian/XapianQuery.php
+++ b/public/main/inc/lib/search/xapian/XapianQuery.php
@@ -1,9 +1,7 @@
 <?php
 
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.include.search
- */
+
 require_once 'xapian.php';
 //TODO: think another way without including specific fields here
 require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
@@ -151,7 +149,7 @@ function xapian_get_all_terms($count = 0, $prefix, $db = null)
 
         $terms = [];
         $i = 0;
-        for (; !$termi->equals($db->allterms_end()) && (++$i <= $count || $count == 0); $termi->next()) {
+        for (; !$termi->equals($db->allterms_end()) && (++$i <= $count || 0 == $count); $termi->next()) {
             $terms[] = [
                 'frequency' => $termi->get_termfreq(),
                 'name' => $termi->get_term(),
@@ -252,19 +250,19 @@ function display_xapian_error($xapian_error_message)
 {
     $message = explode(':', $xapian_error_message);
     $type_error_message = $message[0];
-    if ($type_error_message == 'DatabaseOpeningError') {
+    if ('DatabaseOpeningError' == $type_error_message) {
         $message_error = get_lang('Failed to open the search database');
-    } elseif ($type_error_message == 'DatabaseVersionError') {
+    } elseif ('DatabaseVersionError' == $type_error_message) {
         $message_error = get_lang('The search database uses an unsupported format');
-    } elseif ($type_error_message == 'DatabaseModifiedError') {
+    } elseif ('DatabaseModifiedError' == $type_error_message) {
         $message_error = get_lang('The search database has been modified/broken');
-    } elseif ($type_error_message == 'DatabaseLockError') {
+    } elseif ('DatabaseLockError' == $type_error_message) {
         $message_error = get_lang('Failed to lock the search database');
-    } elseif ($type_error_message == 'DatabaseCreateError') {
+    } elseif ('DatabaseCreateError' == $type_error_message) {
         $message_error = get_lang('Failed to create the search database');
-    } elseif ($type_error_message == 'DatabaseCorruptError') {
+    } elseif ('DatabaseCorruptError' == $type_error_message) {
         $message_error = get_lang('The search database has suffered corruption');
-    } elseif ($type_error_message == 'NetworkTimeoutError') {
+    } elseif ('NetworkTimeoutError' == $type_error_message) {
         $message_error = get_lang('Connection timed out while communicating with the remote search database');
     } else {
         $message_error = get_lang('Error in search engine');
diff --git a/public/main/inc/lib/security.lib.php b/public/main/inc/lib/security.lib.php
index d4a67363a4..3946d0a63d 100644
--- a/public/main/inc/lib/security.lib.php
+++ b/public/main/inc/lib/security.lib.php
@@ -22,8 +22,6 @@ use ChamiloSession as Session;
  * For basic filtering, use filter()
  * For files inclusions (using dynamic paths) use check_rel_path() and check_abs_path()
  *
- * @package chamilo.library
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 
@@ -68,13 +66,13 @@ class Security
 
         $found = strpos($true_path.'/', $checker_path);
 
-        if ($found === 0) {
+        if (0 === $found) {
             return true;
         } else {
             // Code specific to Windows and case-insensitive behaviour
             if (api_is_windows_os()) {
                 $found = stripos($true_path.'/', $checker_path);
-                if ($found === 0) {
+                if (0 === $found) {
                     return true;
                 }
             }
@@ -100,13 +98,13 @@ class Security
             return false;
         }
         $current_path = getcwd(); // No trailing slash.
-        if (substr($rel_path, -1, 1) != '/') {
+        if ('/' != substr($rel_path, -1, 1)) {
             $rel_path = '/'.$rel_path;
         }
         $abs_path = $current_path.$rel_path;
         $true_path = str_replace("\\", '/', realpath($abs_path));
         $found = strpos($true_path.'/', $checker_path);
-        if ($found === 0) {
+        if (0 === $found) {
             return true;
         }
 
@@ -187,7 +185,7 @@ class Security
         $security = Session::read('sec_ua');
         $securitySeed = Session::read('sec_ua_seed');
 
-        if ($security === $_SERVER['HTTP_USER_AGENT'].$securitySeed) {
+        if ($_SERVER['HTTP_USER_AGENT'].$securitySeed === $security) {
             return true;
         }
 
@@ -309,7 +307,7 @@ class Security
             }
         }
 
-        if ($user_status == COURSEMANAGERLOWSECURITY) {
+        if (COURSEMANAGERLOWSECURITY == $user_status) {
             return $var; // No filtering.
         }
 
@@ -329,21 +327,21 @@ class Security
             $config->set('Core.ConvertDocumentToFragment', false);
             $config->set('Core.RemoveProcessingInstructions', true);
 
-            if (api_get_setting('enable_iframe_inclusion') == 'true') {
+            if ('true' == api_get_setting('enable_iframe_inclusion')) {
                 $config->set('Filter.Custom', [new AllowIframes()]);
             }
 
             // Shows _target attribute in anchors
             $config->set('Attr.AllowedFrameTargets', ['_blank', '_top', '_self', '_parent']);
 
-            if ($user_status == STUDENT) {
+            if (STUDENT == $user_status) {
                 global $allowed_html_student;
                 $config->set('HTML.SafeEmbed', true);
                 $config->set('HTML.SafeObject', true);
                 $config->set('Filter.YouTube', true);
                 $config->set('HTML.FlashAllowFullScreen', true);
                 $config->set('HTML.Allowed', $allowed_html_student);
-            } elseif ($user_status == COURSEMANAGER) {
+            } elseif (COURSEMANAGER == $user_status) {
                 global $allowed_html_teacher;
                 $config->set('HTML.SafeEmbed', true);
                 $config->set('HTML.SafeObject', true);
@@ -489,12 +487,12 @@ class Security
         static $allowed_extensions = ['png', 'gif', 'jpg', 'jpeg', 'svg', 'webp'];
         $image_path = htmlspecialchars(trim($image_path)); // No html code is allowed.
         // We allow static images only, query strings are forbidden.
-        if (strpos($image_path, '?') !== false) {
+        if (false !== strpos($image_path, '?')) {
             return '';
         }
-        if (($pos = strpos($image_path, ':')) !== false) {
+        if (false !== ($pos = strpos($image_path, ':'))) {
             // Protocol has been specified, let's check it.
-            if (stripos($image_path, 'javascript:') !== false) {
+            if (false !== stripos($image_path, 'javascript:')) {
                 // Javascript everywhere in the path is not allowed.
                 return '';
             }
@@ -502,7 +500,7 @@ class Security
             //if (!preg_match('/^https?:\/\//i', $image_path)) {
             //    return '';
             //}
-            if (stripos($image_path, 'http://') !== 0 && stripos($image_path, 'https://') !== 0) {
+            if (0 !== stripos($image_path, 'http://') && 0 !== stripos($image_path, 'https://')) {
                 return '';
             }
         }
@@ -510,7 +508,7 @@ class Security
         //if (!preg_match('/.+\.(png|gif|jpg|jpeg)$/i', $image_path)) {
         //    return '';
         //}
-        if (($pos = strrpos($image_path, '.')) !== false) {
+        if (false !== ($pos = strrpos($image_path, '.'))) {
             if (!in_array(strtolower(substr($image_path, $pos + 1)), $allowed_extensions)) {
                 return '';
             }
diff --git a/public/main/inc/lib/sessionmanager.lib.php b/public/main/inc/lib/sessionmanager.lib.php
index 84c157dd2e..f26309a9aa 100644
--- a/public/main/inc/lib/sessionmanager.lib.php
+++ b/public/main/inc/lib/sessionmanager.lib.php
@@ -365,7 +365,7 @@ class SessionManager
         $extraJoin = '';
 
         if (api_is_session_admin() &&
-            api_get_setting('allow_session_admins_to_manage_all_sessions') == 'false'
+            'false' == api_get_setting('allow_session_admins_to_manage_all_sessions')
         ) {
             $where .= " AND (
                             s.session_admin_id = $user_id  OR
@@ -431,7 +431,7 @@ class SessionManager
 
         if (api_is_multiple_url_enabled()) {
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $where .= " AND ar.access_url_id = $access_url_id ";
 
                 $sql = "SELECT count(id) as total_rows FROM (
@@ -488,7 +488,7 @@ class SessionManager
 
         if (!api_is_platform_admin()) {
             if (api_is_session_admin() &&
-                api_get_setting('allow_session_admins_to_manage_all_sessions') === 'false'
+                'false' === api_get_setting('allow_session_admins_to_manage_all_sessions')
             ) {
                 $where .= " AND s.session_admin_id = $userId ";
             }
@@ -496,7 +496,7 @@ class SessionManager
 
         if (!api_is_platform_admin() &&
             api_is_teacher() &&
-            api_get_setting('allow_teachers_to_create_sessions') === 'true'
+            'true' === api_get_setting('allow_teachers_to_create_sessions')
         ) {
             $where .= " AND s.id_coach = $userId ";
         }
@@ -513,12 +513,12 @@ class SessionManager
         $isMakingOrder = false;
         $showCountUsers = false;
 
-        if ($getCount === true) {
+        if (true === $getCount) {
             $select = ' SELECT count(DISTINCT s.id) as total_rows ';
         } else {
             if (!empty($columns['column_model'])) {
                 foreach ($columns['column_model'] as $column) {
-                    if ($column['name'] == 'users') {
+                    if ('users' == $column['name']) {
                         $showCountUsers = true;
                     }
                 }
@@ -541,12 +541,12 @@ class SessionManager
                 $select .= ', count(su.user_id) users';
             }
             if (isset($options['order'])) {
-                $isMakingOrder = strpos($options['order'], 'category_name') === 0;
+                $isMakingOrder = 0 === strpos($options['order'], 'category_name');
             }
         }
 
-        $isFilteringSessionCategory = strpos($where, 'category_name') !== false;
-        $isFilteringSessionCategoryWithName = strpos($where, 'sc.name') !== false;
+        $isFilteringSessionCategory = false !== strpos($where, 'category_name');
+        $isFilteringSessionCategoryWithName = false !== strpos($where, 'sc.name');
 
         if ($isMakingOrder || $isFilteringSessionCategory || $isFilteringSessionCategoryWithName) {
             $sqlInjectJoins .= " LEFT JOIN $sessionCategoryTable sc ON s.session_category_id = sc.id ";
@@ -571,7 +571,7 @@ class SessionManager
             $tblAccessUrlRelSession = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
             $accessUrlId = api_get_current_access_url_id();
 
-            if ($accessUrlId != -1) {
+            if (-1 != $accessUrlId) {
                 $where .= " AND ar.access_url_id = $accessUrlId ";
                 $query = "$select
                     FROM $tblSession s $sqlInjectJoins
@@ -624,7 +624,7 @@ class SessionManager
 
         if (!$getCount && !empty($columns['column_model'])) {
             foreach ($columns['column_model'] as $column) {
-                if ($column['name'] == 'users') {
+                if ('users' == $column['name']) {
                     $showCountUsers = true;
                 }
             }
@@ -680,7 +680,7 @@ class SessionManager
                 }
             }
 
-            if (isset($session['session_active']) && $session['session_active'] == 1) {
+            if (isset($session['session_active']) && 1 == $session['session_active']) {
                 $session['session_active'] = $activeIcon;
             } else {
                 $session['session_active'] = $inactiveIcon;
@@ -707,7 +707,7 @@ class SessionManager
                     $options = explode('::', $value);
                 }
                 $original_key = $key;
-                if (strpos($key, '_second') !== false) {
+                if (false !== strpos($key, '_second')) {
                     $key = str_replace('_second', '', $key);
                 }
 
@@ -715,7 +715,7 @@ class SessionManager
                     isset($options[0]) &&
                     isset($optionsByDouble[$key][$options[0]])
                 ) {
-                    if (strpos($original_key, '_second') === false) {
+                    if (false === strpos($original_key, '_second')) {
                         $value = $optionsByDouble[$key][$options[0]]['option_display_text'];
                     } else {
                         $value = $optionsByDouble[$key][$options[1]]['option_display_text'];
@@ -752,7 +752,7 @@ class SessionManager
         $options
     ) {
         //escaping vars
-        $sessionId = $sessionId == 'T' ? 'T' : intval($sessionId);
+        $sessionId = 'T' == $sessionId ? 'T' : intval($sessionId);
         $courseId = intval($courseId);
 
         //tables
@@ -762,7 +762,7 @@ class SessionManager
 
         $course = api_get_course_info_by_id($courseId);
         $sessionCond = 'and session_id = %s';
-        if ($sessionId == 'T') {
+        if ('T' == $sessionId) {
             $sessionCond = '';
         }
 
@@ -808,7 +808,7 @@ class SessionManager
             ];
 
             $sessionCond = 'AND v.session_id = %d';
-            if ($sessionId == 'T') {
+            if ('T' == $sessionId) {
                 $sessionCond = "";
             }
 
@@ -842,7 +842,7 @@ class SessionManager
                 $data[$lesson['id']] = $data[$lesson['id']].'%';
                 $count++;
             }
-            if ($count == 0) {
+            if (0 == $count) {
                 $data['total'] = 0;
             } else {
                 $data['total'] = round($progress / $count, 2).'%';
@@ -921,7 +921,7 @@ class SessionManager
         //Survey is anonymous?
         $result = Database::query(sprintf("SELECT anonymous FROM $c_survey WHERE survey_id = %d", $surveyId));
         $row = Database::fetch_array($result);
-        $anonymous = ($row['anonymous'] == 1) ? true : false;
+        $anonymous = (1 == $row['anonymous']) ? true : false;
 
         $table = [];
         foreach ($users as $user) {
@@ -959,7 +959,7 @@ class SessionManager
             //Match course lessons with user progress
             foreach ($questions as $question_id => $question) {
                 $option_text = 'option_text';
-                if ($user_questions[$question_id]['type'] == 'open') {
+                if ('open' == $user_questions[$question_id]['type']) {
                     $option_text = 'option_id';
                 }
                 $data[$question_id] = $user_questions[$question_id][$option_text];
@@ -2006,7 +2006,7 @@ class SessionManager
                         );
 
                         // Avoid duplicate entries.
-                        if ($status === false || ($status !== false && $status != 0)) {
+                        if (false === $status || (false !== $status && 0 != $status)) {
                             $enreg_user = (int) $enreg_user;
                             $sql = "INSERT IGNORE INTO $tbl_session_rel_course_rel_user (session_id, c_id, user_id, visibility, status)
                                     VALUES($sessionId, $courseId, $enreg_user, $session_visibility, 0)";
@@ -2042,7 +2042,7 @@ class SessionManager
         }
 
         // Delete users from the session
-        if ($empty_users === true) {
+        if (true === $empty_users) {
             $sql = "DELETE FROM $tbl_session_rel_user
                     WHERE
                       session_id = $sessionId AND
@@ -2067,7 +2067,7 @@ class SessionManager
         // Insert missing users into session
         foreach ($userList as $enreg_user) {
             $isUserSubscribed = self::isUserSubscribedAsStudent($sessionId, $enreg_user);
-            if ($isUserSubscribed === false) {
+            if (false === $isUserSubscribed) {
                 $enreg_user = (int) $enreg_user;
                 $sql = "INSERT IGNORE INTO $tbl_session_rel_user (relation_type, session_id, user_id, registered_at)
                         VALUES (0, $sessionId, $enreg_user, '".api_get_utc_datetime()."')";
@@ -2301,7 +2301,7 @@ class SessionManager
         $courseId = $courseInfo['real_id'];
         $subscribe = (int) api_get_course_setting('subscribe_users_to_forum_notifications', $courseInfo);
         $forums = [];
-        if ($subscribe === 1) {
+        if (1 === $subscribe) {
             require_once api_get_path(SYS_CODE_PATH).'forum/forumfunction.inc.php';
             $forums = get_forums(0, $course_code, true, $session_id);
         }
@@ -2344,7 +2344,7 @@ class SessionManager
                 $count = $row['count'];
             }
 
-            if ($count == 0) {
+            if (0 == $count) {
                 $sql = "INSERT IGNORE INTO $tbl_session_rel_course_rel_user (session_id, c_id, user_id, visibility)
                         VALUES ($session_id, $courseId, $enreg_user, $session_visibility)";
                 $result = Database::query($sql);
@@ -2550,7 +2550,7 @@ class SessionManager
         $user_list = Database::store_result($result);
 
         // Remove existing courses from the session.
-        if ($removeExistingCoursesWithUsers === true && !empty($existingCourses)) {
+        if (true === $removeExistingCoursesWithUsers && !empty($existingCourses)) {
             foreach ($existingCourses as $existingCourse) {
                 if (!in_array($existingCourse['c_id'], $courseList)) {
                     $sql = "DELETE FROM $tbl_session_rel_course
@@ -3094,7 +3094,7 @@ class SessionManager
 
             return $msg;
         }
-        if ($date_end != null) {
+        if (null != $date_end) {
             $sql = "UPDATE $tbl_session_category
                     SET
                         name = '".Database::escape_string($name)."',
@@ -3327,7 +3327,7 @@ class SessionManager
                 s.description,
                 (SELECT COUNT(*) FROM $tbl_session_user WHERE session_id = s.id) as users,
 				(SELECT COUNT(*) FROM $tbl_lp WHERE session_id = s.id) as lessons ";
-        if ($field !== false) {
+        if (false !== $field) {
             $fieldId = $field['id'];
             $sql .= ",(SELECT value FROM $tbl_extra_fields WHERE field_id = $fieldId AND item_id = s.id) as image ";
         }
@@ -3596,7 +3596,7 @@ class SessionManager
                             user_id = $userId AND
                             relation_type = '".SESSION_RELATION_TYPE_RRHH."'";
                 $result = Database::query($sql);
-                if (Database::num_rows($result) == 0) {
+                if (0 == Database::num_rows($result)) {
                     $sql = "INSERT IGNORE INTO $tbl_session_rel_user (session_id, user_id, relation_type, registered_at)
                             VALUES (
                                 $session_id,
@@ -3875,30 +3875,30 @@ class SessionManager
                 $imageFilename = ExtraFieldModel::FIELD_TYPE_FILE_IMAGE.'_'.$row['id'].'.png';
                 $row['image'] = is_file($sysUploadPath.$imageFilename) ? $webUploadPath.$imageFilename : $imgPath;
 
-                if ($row['display_start_date'] == '0000-00-00 00:00:00' || $row['display_start_date'] == '0000-00-00') {
+                if ('0000-00-00 00:00:00' == $row['display_start_date'] || '0000-00-00' == $row['display_start_date']) {
                     $row['display_start_date'] = null;
                 }
 
-                if ($row['display_end_date'] == '0000-00-00 00:00:00' || $row['display_end_date'] == '0000-00-00') {
+                if ('0000-00-00 00:00:00' == $row['display_end_date'] || '0000-00-00' == $row['display_end_date']) {
                     $row['display_end_date'] = null;
                 }
 
-                if ($row['access_start_date'] == '0000-00-00 00:00:00' || $row['access_start_date'] == '0000-00-00') {
+                if ('0000-00-00 00:00:00' == $row['access_start_date'] || '0000-00-00' == $row['access_start_date']) {
                     $row['access_start_date'] = null;
                 }
 
-                if ($row['access_end_date'] == '0000-00-00 00:00:00' || $row['access_end_date'] == '0000-00-00') {
+                if ('0000-00-00 00:00:00' == $row['access_end_date'] || '0000-00-00' == $row['access_end_date']) {
                     $row['access_end_date'] = null;
                 }
 
-                if ($row['coach_access_start_date'] == '0000-00-00 00:00:00' ||
-                    $row['coach_access_start_date'] == '0000-00-00'
+                if ('0000-00-00 00:00:00' == $row['coach_access_start_date'] ||
+                    '0000-00-00' == $row['coach_access_start_date']
                 ) {
                     $row['coach_access_start_date'] = null;
                 }
 
-                if ($row['coach_access_end_date'] == '0000-00-00 00:00:00' ||
-                    $row['coach_access_end_date'] == '0000-00-00'
+                if ('0000-00-00 00:00:00' == $row['coach_access_end_date'] ||
+                    '0000-00-00' == $row['coach_access_end_date']
                 ) {
                     $row['coach_access_end_date'] = null;
                 }
@@ -4269,7 +4269,7 @@ class SessionManager
                 $sqlCoach = " id_coach = $user_id AND ";
             }
 
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql = 'SELECT DISTINCT session.*
                     FROM '.$session_table.' session INNER JOIN '.$tbl_session_rel_access_url.' session_rel_url
                     ON (session.id = session_rel_url.session_id)
@@ -4549,7 +4549,7 @@ class SessionManager
                 $short_courses = $new_short_courses;
                 self::add_courses_to_session($sid, $short_courses, true);
 
-                if ($create_new_courses === false && $copyTeachersAndDrh) {
+                if (false === $create_new_courses && $copyTeachersAndDrh) {
                     foreach ($short_courses as $courseItemId) {
                         $coachList = self::getCoachesByCourseSession($id, $courseItemId);
                         foreach ($coachList as $userId) {
@@ -4695,7 +4695,7 @@ class SessionManager
 
         $setting = api_get_setting('allow_teachers_to_create_sessions');
 
-        if (api_is_teacher() && $setting == 'true') {
+        if (api_is_teacher() && 'true' == $setting) {
             return true;
         }
 
@@ -5002,7 +5002,7 @@ class SessionManager
                 // Searching a general coach.
                 if (!empty($enreg['Coach'])) {
                     $coach_id = UserManager::get_user_id_from_username($enreg['Coach']);
-                    if ($coach_id === false) {
+                    if (false === $coach_id) {
                         // If the coach-user does not exist - I'm the coach.
                         $coach_id = $defaultUserId;
                     }
@@ -5014,7 +5014,7 @@ class SessionManager
                 $courses = explode('|', $enreg['Courses']);
 
                 $deleteOnlyCourseCoaches = false;
-                if (count($courses) == 1) {
+                if (1 == count($courses)) {
                     if ($logger) {
                         $logger->addInfo('Only one course delete old coach list');
                     }
@@ -5063,7 +5063,7 @@ class SessionManager
                     if ($debug) {
                         if ($session_id) {
                             foreach ($enreg as $key => $value) {
-                                if (substr($key, 0, 6) == 'extra_') { //an extra field
+                                if ('extra_' == substr($key, 0, 6)) { //an extra field
                                     self::update_session_extra_field_value($session_id, substr($key, 6), $value);
                                 }
                             }
@@ -5088,7 +5088,7 @@ class SessionManager
                         $my_session_result = self::get_session_by_name($enreg['SessionName']);
                     }
 
-                    if ($my_session_result === false) {
+                    if (false === $my_session_result) {
                         // One more check
                         $sessionExistsWithName = self::get_session_by_name($session_name);
                         if ($sessionExistsWithName) {
@@ -5124,7 +5124,7 @@ class SessionManager
 
                         if ($session_id) {
                             foreach ($enreg as $key => $value) {
-                                if (substr($key, 0, 6) == 'extra_') { //an extra field
+                                if ('extra_' == substr($key, 0, 6)) { //an extra field
                                     self::update_session_extra_field_value($session_id, substr($key, 6), $value);
                                 }
                             }
@@ -5185,7 +5185,7 @@ class SessionManager
                             $session_id = $sessionId;
                             if (!empty($enreg['SessionName'])) {
                                 $sessionExistsWithName = self::get_session_by_name($session_name);
-                                if ($sessionExistsWithName === false) {
+                                if (false === $sessionExistsWithName) {
                                     $sessionName = Database::escape_string($enreg['SessionName']);
                                     $sql = "UPDATE $tbl_session SET name = '$sessionName' WHERE id = $session_id";
                                     Database::query($sql);
@@ -5197,7 +5197,7 @@ class SessionManager
                                         $session_id,
                                         $session_name
                                     );
-                                    if ($sessionExistsBesidesMe === true) {
+                                    if (true === $sessionExistsBesidesMe) {
                                         if ($debug) {
                                             $message = "Skip Session. Error when update session Session #$session_id Name: '$session_name'. Other session has the same name. External id: ".$enreg['extra_'.$extraFieldId];
                                             $logger->addError($message);
@@ -5244,7 +5244,7 @@ class SessionManager
 
                             Database::update($tbl_session, $params, ['id = ?' => $session_id]);
                             foreach ($enreg as $key => $value) {
-                                if (substr($key, 0, 6) == 'extra_') { //an extra field
+                                if ('extra_' == substr($key, 0, 6)) { //an extra field
                                     self::update_session_extra_field_value($session_id, substr($key, 6), $value);
                                 }
                             }
@@ -5311,7 +5311,7 @@ class SessionManager
 
                     foreach ($users as $user) {
                         $user_id = UserManager::get_user_id_from_username($user);
-                        if ($user_id !== false) {
+                        if (false !== $user_id) {
                             if (!empty($finalCareerIdList)) {
                                 foreach ($finalCareerIdList as $careerId) {
                                     UserManager::addUserCareer($user_id, $careerId);
@@ -5434,7 +5434,7 @@ class SessionManager
 
                                 foreach ($course_coaches as $course_coach) {
                                     $coach_id = UserManager::get_user_id_from_username($course_coach);
-                                    if ($coach_id !== false) {
+                                    if (false !== $coach_id) {
                                         // Just insert new coaches
                                         self::updateCoaches(
                                             $session_id,
@@ -5456,14 +5456,14 @@ class SessionManager
                             // Custom courses/session coaches
                             $teacherToAdd = null;
                             // Only one coach is added.
-                            if ($onlyAddFirstCoachOrTeacher == true) {
+                            if (true == $onlyAddFirstCoachOrTeacher) {
                                 if ($debug) {
                                     $logger->addInfo("onlyAddFirstCoachOrTeacher : true");
                                 }
 
                                 foreach ($course_coaches as $course_coach) {
                                     $coach_id = UserManager::get_user_id_from_username($course_coach);
-                                    if ($coach_id !== false) {
+                                    if (false !== $coach_id) {
                                         $teacherToAdd = $coach_id;
                                         break;
                                     }
@@ -5596,7 +5596,7 @@ class SessionManager
                                     $coach_id = UserManager::get_user_id_from_username(
                                         $course_coach
                                     );
-                                    if ($coach_id !== false) {
+                                    if (false !== $coach_id) {
                                         $teacherToAdd[] = $coach_id;
                                     }
                                 }
@@ -5710,15 +5710,15 @@ class SessionManager
                             }
 
                             // Continue default behaviour.
-                            if ($onlyAddFirstCoachOrTeacher == false) {
+                            if (false == $onlyAddFirstCoachOrTeacher) {
                                 // Checking one more time see BT#6449#note-149
                                 $coaches = self::getCoachesByCourseSession($session_id, $courseId);
                                 // Update coaches if only there's 1 course see BT#6449#note-189
-                                if (empty($coaches) || count($courses) == 1) {
+                                if (empty($coaches) || 1 == count($courses)) {
                                     foreach ($course_coaches as $course_coach) {
                                         $course_coach = trim($course_coach);
                                         $coach_id = UserManager::get_user_id_from_username($course_coach);
-                                        if ($coach_id !== false) {
+                                        if (false !== $coach_id) {
                                             // Just insert new coaches
                                             self::updateCoaches(
                                                 $session_id,
@@ -5745,7 +5745,7 @@ class SessionManager
                             foreach ($course_users as $user) {
                                 $user_id = UserManager::get_user_id_from_username($user);
 
-                                if ($user_id !== false) {
+                                if (false !== $user_id) {
                                     self::subscribe_users_to_session_course(
                                         [$user_id],
                                         $session_id,
@@ -6360,7 +6360,7 @@ class SessionManager
             }
         }
 
-        if ($drhLoaded == false) {
+        if (false == $drhLoaded) {
             $count = UserManager::getUsersFollowedByUser(
                 $userId,
                 $filterUserStatus,
@@ -6653,7 +6653,7 @@ class SessionManager
     public static function orderCourseIsEnabled()
     {
         $sessionCourseOrder = api_get_setting('session_course_ordering');
-        if ($sessionCourseOrder === 'true') {
+        if ('true' === $sessionCourseOrder) {
             return true;
         }
 
@@ -6682,7 +6682,7 @@ class SessionManager
         $position = [];
         $count = 0;
         foreach ($courseList as $course) {
-            if ($course['position'] == '') {
+            if ('' == $course['position']) {
                 $course['position'] = $count;
             }
             $position[$course['code']] = $course['position'];
@@ -6790,7 +6790,7 @@ class SessionManager
         $currentTime = time();
 
         // If no previous access, return false
-        if (count($courseAccess) == 0) {
+        if (0 == count($courseAccess)) {
             return $duration;
         }
 
@@ -6964,7 +6964,7 @@ class SessionManager
                 $newSessions = [];
                 foreach ($sessions as $session) {
                     $visibility = api_get_session_visibility($session['id']);
-                    if ($visibility == SESSION_INVISIBLE) {
+                    if (SESSION_INVISIBLE == $visibility) {
                         continue;
                     }
                     $newSessions[] = $session;
@@ -7000,7 +7000,7 @@ class SessionManager
 
         $result = Database::query($sql);
 
-        if ($result !== false) {
+        if (false !== $result) {
             $data = Database::fetch_assoc($result);
 
             if ($data['qty'] > 0) {
@@ -7042,7 +7042,7 @@ class SessionManager
             'first'
         );
 
-        if ($trackResult != false) {
+        if (false != $trackResult) {
             return $trackResult['total_time'] ? $trackResult['total_time'] : '00:00:00';
         }
 
@@ -7211,7 +7211,7 @@ class SessionManager
                         // Check if session field value is set in session field list
                         if (isset($fields[$sessionFieldValue['field_id']])) {
                             // Avoid overwriting the session's ID field
-                            if ($fields[$sessionFieldValue['field_id']] != 'id') {
+                            if ('id' != $fields[$sessionFieldValue['field_id']]) {
                                 $var = $fields[$sessionFieldValue['field_id']];
                                 $val = $sessionFieldValue['value'];
                                 // Assign session field value to session
@@ -7261,7 +7261,7 @@ class SessionManager
             } elseif (count($result) > 1 && !$force) {
                 // If found more than one result and force is disabled, update error message
                 $errorResult['errorMessage'] = 'Found many session categories';
-            } elseif (count($result) == 1 || $force) {
+            } elseif (1 == count($result) || $force) {
                 // If found just one session category or force option is enabled
 
                 return key($result);
@@ -7607,7 +7607,7 @@ class SessionManager
             $sessionAccessUrlTable = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
             $accessUrlId = api_get_current_access_url_id();
 
-            if ($accessUrlId != -1) {
+            if (-1 != $accessUrlId) {
                 $sql = "SELECT DISTINCT s.*
                         FROM $sessionTable s
                         INNER JOIN $sessionUserTable sru ON s.id = sru.id_session
@@ -7707,7 +7707,7 @@ class SessionManager
             '0' => get_lang('none'),
         ];
 
-        if ($categoriesList != false) {
+        if (false != $categoriesList) {
             foreach ($categoriesList as $categoryItem) {
                 $categoriesOptions[$categoryItem['id']] = $categoryItem['name'];
             }
@@ -7754,7 +7754,7 @@ class SessionManager
                         TABLE_MAIN_ACCESS_URL_REL_USER
                     );
                     $accessUrlId = api_get_current_access_url_id();
-                    if ($accessUrlId != -1) {
+                    if (-1 != $accessUrlId) {
                         $sql = "SELECT user.user_id, username, lastname, firstname
                         FROM $tbl_user user
                         INNER JOIN $userRelAccessUrlTable url_user
@@ -8004,7 +8004,7 @@ class SessionManager
         $user_id = api_get_user_id();
 
         if (api_is_session_admin() &&
-            api_get_setting('allow_session_admins_to_see_all_sessions') == 'false'
+            'false' == api_get_setting('allow_session_admins_to_see_all_sessions')
         ) {
             $where .= " WHERE s.session_admin_id = $user_id ";
         }
@@ -8065,7 +8065,7 @@ class SessionManager
         if (api_is_multiple_url_enabled()) {
             $table_access_url_rel_session = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $where .= " AND ar.access_url_id = $access_url_id ";
                 $query_rows = "SELECT count(*) as total_rows
                                FROM $tbl_session s
@@ -8363,7 +8363,7 @@ class SessionManager
 
         if (!api_is_platform_admin()) {
             if (api_is_session_admin() &&
-                api_get_setting('allow_session_admins_to_manage_all_sessions') == 'false'
+                'false' == api_get_setting('allow_session_admins_to_manage_all_sessions')
             ) {
                 $where .= " AND s.session_admin_id = $user_id ";
             }
@@ -8395,7 +8395,7 @@ class SessionManager
                         $extra_fields_info[$extra['id']] = $info;
                     }
 
-                    if ($info['field_type'] == ExtraFieldModel::FIELD_TYPE_DOUBLE_SELECT) {
+                    if (ExtraFieldModel::FIELD_TYPE_DOUBLE_SELECT == $info['field_type']) {
                         $double_fields[$info['id']] = $info;
                     }
                 }
@@ -8488,7 +8488,7 @@ class SessionManager
         if (api_is_multiple_url_enabled()) {
             $table_access_url_rel_session = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $query = "$select
                     FROM $tbl_session s
                     LEFT JOIN $tbl_session_field_values fv
@@ -8540,7 +8540,7 @@ class SessionManager
                 $session_id = $session['id'];
                 $session['name'] = Display::url($session['name'], "resume_session.php?id_session=".$session['id']);
                 $session['coach_name'] = Display::url($session['coach_name'], "user_information.php?user_id=".$session['user_id']);
-                if ($session['session_active'] == 1) {
+                if (1 == $session['session_active']) {
                     $session['session_active'] = $acceptIcon;
                 } else {
                     $session['session_active'] = $errorIcon;
@@ -8568,7 +8568,7 @@ class SessionManager
                     }
                     $original_key = $key;
 
-                    if (strpos($key, '_second') === false) {
+                    if (false === strpos($key, '_second')) {
                     } else {
                         $key = str_replace('_second', '', $key);
                     }
@@ -8576,7 +8576,7 @@ class SessionManager
                     if (isset($options_by_double[$key])) {
                         if (isset($options[0])) {
                             if (isset($options_by_double[$key][$options[0]])) {
-                                if (strpos($original_key, '_second') === false) {
+                                if (false === strpos($original_key, '_second')) {
                                     $value = $options_by_double[$key][$options[0]]['option_display_text'];
                                 } else {
                                     $value = $options_by_double[$key][$options[1]]['option_display_text'];
@@ -9033,7 +9033,7 @@ class SessionManager
         $userRelSession = self::getUserSession($userId, $sessionId);
 
         if ($userRelSession) {
-            if (isset($userRelSession['collapsed']) && $userRelSession['collapsed'] != '') {
+            if (isset($userRelSession['collapsed']) && '' != $userRelSession['collapsed']) {
                 $collapsed = $userRelSession['collapsed'];
             }
         } else {
@@ -9042,7 +9042,7 @@ class SessionManager
 
         $link = $collapsableLink.'&session_id='.$sessionId.'&value=1';
         $image = '<i class="fa fa-folder-open"></i>';
-        if ($collapsed == 1) {
+        if (1 == $collapsed) {
             $link = $collapsableLink.'&session_id='.$sessionId.'&value=0';
             $image = '<i class="fa fa-folder"></i>';
         }
@@ -9149,7 +9149,7 @@ class SessionManager
         $userId = api_get_user_id();
 
         if (api_is_session_admin() &&
-            api_get_setting('allow_session_admins_to_manage_all_sessions') != 'true'
+            'true' != api_get_setting('allow_session_admins_to_manage_all_sessions')
         ) {
             if ($sessionInfo['session_admin_id'] != $userId) {
                 return false;
@@ -9157,7 +9157,7 @@ class SessionManager
         }
 
         if (api_is_teacher() &&
-            api_get_setting('allow_teachers_to_create_sessions') == 'true'
+            'true' == api_get_setting('allow_teachers_to_create_sessions')
         ) {
             if ($sessionInfo['id_coach'] != $userId) {
                 return false;
@@ -9220,9 +9220,9 @@ class SessionManager
      */
     private static function compareBySessionName($listA, $listB)
     {
-        if ($listB['catSessionName'] == '') {
+        if ('' == $listB['catSessionName']) {
             return -1;
-        } elseif ($listA['catSessionName'] == '') {
+        } elseif ('' == $listA['catSessionName']) {
             return 1;
         } elseif ($listA['catSessionName'] == $listB['catSessionName']) {
             return 0;
diff --git a/public/main/inc/lib/skill.lib.php b/public/main/inc/lib/skill.lib.php
index 15992e22ef..df77f6cb5d 100644
--- a/public/main/inc/lib/skill.lib.php
+++ b/public/main/inc/lib/skill.lib.php
@@ -14,8 +14,6 @@ use Fhaculty\Graph\Vertex;
  * Class SkillProfile.
  *
  * @todo break the file in different classes
- *
- * @package chamilo.library
  */
 class SkillProfile extends Model
 {
@@ -240,7 +238,7 @@ class SkillRelSkill extends Model
 
         $parents = [];
         if (!empty($skill)) {
-            if ($skill['parent_id'] != null) {
+            if (null != $skill['parent_id']) {
                 $parents = self::getSkillParents($skill['parent_id']);
             }
             if ($add_child_info) {
@@ -1256,7 +1254,7 @@ class Skill extends Model
             }
 
             // Cannot change parent of root
-            if ($skillId == 1) {
+            if (1 == $skillId) {
                 $params['parent_id'] = 0;
             }
 
@@ -1359,7 +1357,7 @@ class Skill extends Model
                 $data = $subVertex->getAttribute('graphviz.data');
                 $passed = in_array($data['id'], array_keys($skills));
                 $transparency = '';
-                if ($passed === false) {
+                if (false === $passed) {
                     // @todo use css class
                     $transparency = 'opacity: 0.4; filter: alpha(opacity=40);';
                 }
@@ -1371,7 +1369,7 @@ class Skill extends Model
                     $subTable .= '</li>';
                 } else {
                     $imageSize = 'mini';
-                    if ($level == 2) {
+                    if (2 == $level) {
                         $imageSize = 'small';
                     }
                     $showTitle = true;
@@ -1510,7 +1508,7 @@ class Skill extends Model
 
                         $passed = in_array($data['id'], array_keys($skills));
                         $transparency = '';
-                        if ($passed === false) {
+                        if (false === $passed) {
                             // @todo use a css class
                             $transparency = 'opacity: 0.4; filter: alpha(opacity=40);';
                         }
@@ -1534,7 +1532,7 @@ class Skill extends Model
 
                         $passed = in_array($data['id'], array_keys($skills));
                         $transparency = '';
-                        if ($passed === false) {
+                        if (false === $passed) {
                             // @todo use a css class
                             $transparency = 'opacity: 0.4; filter: alpha(opacity=40);';
                         }
@@ -1588,7 +1586,7 @@ class Skill extends Model
         $return_flat_array = false,
         $add_root = false
     ) {
-        if ($skill_id == 1) {
+        if (1 == $skill_id) {
             $skill_id = 0;
         }
         if (isset($user_id) && !empty($user_id)) {
@@ -1629,7 +1627,7 @@ class Skill extends Model
         $family = [];
         if (!empty($skills)) {
             foreach ($skills as &$skill) {
-                if ($skill['parent_id'] == 0) {
+                if (0 == $skill['parent_id']) {
                     $skill['parent_id'] = 'root';
                 }
 
@@ -1640,7 +1638,7 @@ class Skill extends Model
                 // If a short code was defined, send the short code to replace
                 // skill name (to shorten the text in the wheel)
                 if (!empty($skill['short_code']) &&
-                    api_get_setting('show_full_skill_name_on_skill_wheel') === 'false'
+                    'false' === api_get_setting('show_full_skill_name_on_skill_wheel')
                 ) {
                     $skill['data']['short_code'] = $skill['short_code'];
                 }
@@ -1650,7 +1648,7 @@ class Skill extends Model
 
                 // In order to paint all members of a family with the same color
                 if (empty($skill_id)) {
-                    if ($skill['parent_id'] == 1) {
+                    if (1 == $skill['parent_id']) {
                         $family[$skill['id']] = $this->getAllChildren($skill['id']);
                     }
                 } else {
@@ -1981,7 +1979,7 @@ class Skill extends Model
             'first'
         );
 
-        if ($result != false) {
+        if (false != $result) {
             if ($result['qty'] > 0) {
                 return true;
             }
@@ -2018,7 +2016,7 @@ class Skill extends Model
             'first'
         );
 
-        if ($result === false) {
+        if (false === $result) {
             return false;
         }
 
@@ -2040,7 +2038,7 @@ class Skill extends Model
     {
         $courseId = (int) $courseId;
 
-        if ($courseId == 0) {
+        if (0 == $courseId) {
             return [];
         }
 
@@ -2087,7 +2085,7 @@ class Skill extends Model
     {
         $skillId = (int) $skillId;
 
-        if ($skillId == 0) {
+        if (0 == $skillId) {
             return [];
         }
 
@@ -2165,7 +2163,7 @@ class Skill extends Model
 
         switch ($fromUserStatus) {
             case SESSIONADMIN:
-                if (api_get_setting('allow_session_admins_to_manage_all_sessions') === 'true') {
+                if ('true' === api_get_setting('allow_session_admins_to_manage_all_sessions')) {
                     if ($toUser->getCreatorId() === $fromUser->getId()) {
                         return true;
                     }
@@ -2212,7 +2210,7 @@ class Skill extends Model
      */
     public static function isAllowed($studentId = 0, $blockPage = true)
     {
-        $allowHR = api_get_setting('allow_hr_skills_management') === 'true';
+        $allowHR = 'true' === api_get_setting('allow_hr_skills_management');
 
         if (self::isToolAvailable()) {
             if (api_is_platform_admin(false, $allowHR)) {
@@ -2250,7 +2248,7 @@ class Skill extends Model
     {
         $allowTool = api_get_setting('allow_skills_tool');
 
-        if ($allowTool === 'true') {
+        if ('true' === $allowTool) {
             return true;
         }
 
@@ -2285,7 +2283,7 @@ class Skill extends Model
             }
 
             $allow = api_get_configuration_value('allow_private_skills');
-            if ($allow === true) {
+            if (true === $allow) {
                 if (api_is_teacher()) {
                     return UserManager::isTeacherOfStudent(
                         $currentUserId,
@@ -2437,7 +2435,7 @@ class Skill extends Model
         $form->addText('short_code', [get_lang('Short code'), $translateCodeButton], false, ['id' => 'short_code']);
 
         // Cannot change parent of root
-        if ($skillId != 1) {
+        if (1 != $skillId) {
             $form->addSelect('parent_id', get_lang('Parent'), $skillList, ['id' => 'parent_id']);
         }
 
@@ -2985,7 +2983,7 @@ class Skill extends Model
      */
     public function addSkillToUserBadge($user, $skill, $levelId, $argumentation, $authorId)
     {
-        $showLevels = api_get_configuration_value('hide_skill_levels') === false;
+        $showLevels = false === api_get_configuration_value('hide_skill_levels');
 
         $entityManager = Database::getManager();
 
diff --git a/public/main/inc/lib/skill.visualizer.lib.php b/public/main/inc/lib/skill.visualizer.lib.php
index 67bbc64cf8..30bb27aff9 100644
--- a/public/main/inc/lib/skill.visualizer.lib.php
+++ b/public/main/inc/lib/skill.visualizer.lib.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.admin
- *
  * @todo lib not use. Only the class variables not the functions
  */
 class SkillVisualizer
@@ -47,7 +45,7 @@ class SkillVisualizer
         $block_id = $skill['id'];
 
         $extra_class = 'third_window';
-        if ($skill['parent_id'] == 0) {
+        if (0 == $skill['parent_id']) {
             $extra_class = 'second_window';
         }
 
@@ -61,7 +59,7 @@ class SkillVisualizer
 
         $this->html .= $content;
 
-        if ($this->type == 'edit' && $skill['parent_id'] != 0) {
+        if ('edit' == $this->type && 0 != $skill['parent_id']) {
             //$this->html .= Display::url(Display::return_icon('edit.png', get_lang('Edit'), array(), ICON_SIZE_SMALL), '#', array('id'=>'edit_block_'.$block_id,'class'=>'edit_block'));
             //$this->html .= Display::url(Display::return_icon('add.png', get_lang('Add'), array(), ICON_SIZE_SMALL), '#', array('id'=>'edit_block_'.$block_id,'class'=>'edit_block'));
             //$this->html .= Display::url(Display::return_icon('delete.png', get_lang('Delete'), array(), ICON_SIZE_SMALL), '#', array('id=>"edit_block_'.$block_id,'class'=>'edit_block'));
@@ -118,7 +116,7 @@ class SkillVisualizer
             $brother_count = $brothers[$skill['id']];
             $my_count = 0;
             $parent_x = 0;
-            if ($skill['parent_id'] == 0) {
+            if (0 == $skill['parent_id']) {
                 //$x = 130*$childs/2;
                 //$x = $this->space_between_blocks_x*$childs/2;
                 $x = $this->canvas_x / 2 - $this->block_size / 2;
@@ -156,11 +154,11 @@ class SkillVisualizer
         $block_id = $skill['id'];
         $end_point = 'readEndpoint';
         $class = 'default_window';
-        if ($this->type == 'edit') {
+        if ('edit' == $this->type) {
             $class = 'edit_window';
             $end_point = 'editEndpoint';
         } else {
-            if ($skill['done_by_user'] == 1) {
+            if (1 == $skill['done_by_user']) {
                 $class = 'done_window';
                 $end_point = 'doneEndpoint';
             } else {
@@ -169,7 +167,7 @@ class SkillVisualizer
         }
         $this->prepare_skill_box($skill, $position, $class);
 
-        if ($skill['parent_id'] == 0) {
+        if (0 == $skill['parent_id']) {
             return;
         }
         //default_arrow_color
diff --git a/public/main/inc/lib/social.lib.php b/public/main/inc/lib/social.lib.php
index 5c0f1b5b5c..a665b1097f 100644
--- a/public/main/inc/lib/social.lib.php
+++ b/public/main/inc/lib/social.lib.php
@@ -12,8 +12,6 @@ use Laminas\Feed\Reader\Reader;
  *
  * This class provides methods for the social network management.
  * Include/require it in your code to use its features.
- *
- * @package chamilo.social
  */
 class SocialManager extends UserManager
 {
@@ -46,7 +44,7 @@ class SocialManager extends UserManager
             $friend_relation_list[] = $row;
         }
         $count_list = count($friend_relation_list);
-        if ($count_list == 0) {
+        if (0 == $count_list) {
             $friend_relation_list[] = get_lang('Unknown');
         } else {
             return $friend_relation_list;
@@ -245,7 +243,7 @@ class SocialManager extends UserManager
         $res_exist = Database::query($sql);
         $row_exist = Database::fetch_array($res_exist, 'ASSOC');
 
-        if ($row_exist['count'] == 0) {
+        if (0 == $row_exist['count']) {
             $params = [
                 'user_sender_id' => $user_id,
                 'user_receiver_id' => $friend_id,
@@ -280,7 +278,7 @@ class SocialManager extends UserManager
                         msg_status = 7';
             $res_if_exist = Database::query($sql);
             $row_if_exist = Database::fetch_array($res_if_exist, 'ASSOC');
-            if ($row_if_exist['count'] == 1) {
+            if (1 == $row_if_exist['count']) {
                 $sql = 'UPDATE '.$tbl_message.' SET
                             msg_status = 5, content = "'.$clean_message_content.'"
                         WHERE
@@ -417,7 +415,7 @@ class SocialManager extends UserManager
                 WHERE
                     user_receiver_id = '.$userId.' AND
                     msg_status = '.MESSAGE_STATUS_INVITATION_PENDING;
-        if ($limit != null && $limit > 0) {
+        if (null != $limit && $limit > 0) {
             $sql .= ' LIMIT '.$limit;
         }
         $res = Database::query($sql);
@@ -570,7 +568,7 @@ class SocialManager extends UserManager
             return '';
         }
         $feeds = explode(';', $feed['rssfeeds']);
-        if (count($feeds) == 0) {
+        if (0 == count($feeds)) {
             return '';
         }
         $res = '';
@@ -847,14 +845,14 @@ class SocialManager extends UserManager
             ['shared_profile', 'groups', 'group_edit', 'member_list', 'waiting_list', 'invite_friends']
         )) {
             $links = '<ul class="nav nav-pills nav-stacked">';
-            $active = $show === 'home' ? 'active' : null;
+            $active = 'home' === $show ? 'active' : null;
             $links .= '
                 <li class="home-icon '.$active.'">
                     <a href="'.api_get_path(WEB_CODE_PATH).'social/home.php">
                         '.$homeIcon.' '.get_lang('Home').'
                     </a>
                 </li>';
-            $active = $show === 'messages' ? 'active' : null;
+            $active = 'messages' === $show ? 'active' : null;
             $links .= '
                 <li class="messages-icon '.$active.'">
                     <a href="'.api_get_path(WEB_CODE_PATH).'messages/inbox.php">
@@ -863,7 +861,7 @@ class SocialManager extends UserManager
                 </li>';
 
             // Invitations
-            $active = $show === 'invitations' ? 'active' : null;
+            $active = 'invitations' === $show ? 'active' : null;
             $links .= '
                 <li class="invitations-icon '.$active.'">
                     <a href="'.api_get_path(WEB_CODE_PATH).'social/invitations.php">
@@ -872,21 +870,21 @@ class SocialManager extends UserManager
                 </li>';
 
             // Shared profile and groups
-            $active = $show === 'shared_profile' ? 'active' : null;
+            $active = 'shared_profile' === $show ? 'active' : null;
             $links .= '
                 <li class="shared-profile-icon'.$active.'">
                     <a href="'.api_get_path(WEB_CODE_PATH).'social/profile.php">
                         '.$sharedProfileIcon.' '.get_lang('My shared profile').'
                     </a>
                 </li>';
-            $active = $show === 'friends' ? 'active' : null;
+            $active = 'friends' === $show ? 'active' : null;
             $links .= '
                 <li class="friends-icon '.$active.'">
                     <a href="'.api_get_path(WEB_CODE_PATH).'social/friends.php">
                         '.$friendsIcon.' '.get_lang('Friends').'
                     </a>
                 </li>';
-            $active = $show === 'browse_groups' ? 'active' : null;
+            $active = 'browse_groups' === $show ? 'active' : null;
             $links .= '
                 <li class="browse-groups-icon '.$active.'">
                     <a href="'.$groupUrl.'">
@@ -895,7 +893,7 @@ class SocialManager extends UserManager
                 </li>';
 
             // Search users
-            $active = $show === 'search' ? 'active' : null;
+            $active = 'search' === $show ? 'active' : null;
             $links .= '
                 <li class="search-icon '.$active.'">
                     <a href="'.api_get_path(WEB_CODE_PATH).'social/search.php">
@@ -904,7 +902,7 @@ class SocialManager extends UserManager
                 </li>';
 
             // My files
-            $active = $show === 'myfiles' ? 'active' : null;
+            $active = 'myfiles' === $show ? 'active' : null;
 
             $myFiles = '
                 <li class="myfiles-icon '.$active.'">
@@ -913,13 +911,13 @@ class SocialManager extends UserManager
                     </a>
                 </li>';
 
-            if (api_get_setting('allow_my_files') === 'false') {
+            if ('false' === api_get_setting('allow_my_files')) {
                 $myFiles = '';
             }
             $links .= $myFiles;
             if (api_get_configuration_value('allow_portfolio_tool')) {
                 $links .= '
-                    <li class="portoflio-icon '.($show === 'portfolio' ? 'active' : '').'">
+                    <li class="portoflio-icon '.('portfolio' === $show ? 'active' : '').'">
                         <a href="'.api_get_path(WEB_CODE_PATH).'portfolio/index.php">
                             '.$portfolioIcon.' '.get_lang('Portfolio').'
                         </a>
@@ -928,7 +926,7 @@ class SocialManager extends UserManager
             }
 
             if (!api_get_configuration_value('disable_gdpr')) {
-                $active = $show === 'personal-data' ? 'active' : null;
+                $active = 'personal-data' === $show ? 'active' : null;
                 $personalData = '
                     <li class="personal-data-icon '.$active.'">
                         <a href="'.api_get_path(WEB_CODE_PATH).'social/personal_data.php">
@@ -939,7 +937,7 @@ class SocialManager extends UserManager
             }
 
             if (api_is_platform_admin()) {
-                $active = $show === 'promoted_messages' ? 'active' : null;
+                $active = 'promoted_messages' === $show ? 'active' : null;
                 $personalData = '
                     <li class="personal-data-icon '.$active.'">
                         <a href="'.api_get_path(WEB_CODE_PATH).'social/promoted_messages.php">
@@ -967,7 +965,7 @@ class SocialManager extends UserManager
             );
         }
 
-        if ($show === 'shared_profile') {
+        if ('shared_profile' === $show) {
             $links = '<ul class="nav nav-pills nav-stacked">';
             // My own profile
             if ($show_full_profile && $user_id == api_get_user_id()) {
@@ -982,7 +980,7 @@ class SocialManager extends UserManager
                             '.$messagesIcon.' '.get_lang('Messages').$count_unread_message.'
                         </a>
                     </li>';
-                $active = $show === 'invitations' ? 'active' : null;
+                $active = 'invitations' === $show ? 'active' : null;
                 $links .= '
                     <li class="invitations-icon'.$active.'">
                         <a href="'.api_get_path(WEB_CODE_PATH).'social/invitations.php">
@@ -1008,14 +1006,14 @@ class SocialManager extends UserManager
                         </a>
                         </li>';
 
-                $active = $show == 'search' ? 'active' : null;
+                $active = 'search' == $show ? 'active' : null;
                 $links .= '
                     <li class="search-icon '.$active.'">
                         <a href="'.api_get_path(WEB_CODE_PATH).'social/search.php">
                             '.$searchIcon.' '.get_lang('Search').'
                         </a>
                     </li>';
-                $active = $show == 'myfiles' ? 'active' : null;
+                $active = 'myfiles' == $show ? 'active' : null;
 
                 $myFiles = '
                     <li class="myfiles-icon '.$active.'">
@@ -1024,14 +1022,14 @@ class SocialManager extends UserManager
                         </a>
                     </li>';
 
-                if (api_get_setting('allow_my_files') === 'false') {
+                if ('false' === api_get_setting('allow_my_files')) {
                     $myFiles = '';
                 }
                 $links .= $myFiles;
 
                 if (api_get_configuration_value('allow_portfolio_tool')) {
                     $links .= '
-                        <li class="portoflio-icon '.($show == 'portfolio' ? 'active' : '').'">
+                        <li class="portoflio-icon '.('portfolio' == $show ? 'active' : '').'">
                             <a href="'.api_get_path(WEB_CODE_PATH).'portfolio/index.php">
                                 '.$portfolioIcon.' '.get_lang('Portfolio').'
                             </a>
@@ -1040,7 +1038,7 @@ class SocialManager extends UserManager
                 }
 
                 if (!api_get_configuration_value('disable_gdpr')) {
-                    $active = $show == 'personal-data' ? 'active' : null;
+                    $active = 'personal-data' == $show ? 'active' : null;
                     $personalData = '
                     <li class="personal-data-icon '.$active.'">
                         <a href="'.api_get_path(WEB_CODE_PATH).'social/personal_data.php">
@@ -1078,7 +1076,7 @@ class SocialManager extends UserManager
 
                 if (api_get_configuration_value('allow_portfolio_tool')) {
                     $links .= '
-                        <li class="portoflio-icon '.($show == 'portfolio' ? 'active' : '').'">
+                        <li class="portoflio-icon '.('portfolio' == $show ? 'active' : '').'">
                             <a href="'.api_get_path(WEB_CODE_PATH).'portfolio/index.php?user='.$user_id.'">
                                 '.$portfolioIcon.' '.get_lang('Portfolio').'
                             </a>
@@ -1193,9 +1191,9 @@ class SocialManager extends UserManager
             $lastname = $user_info['lastname'];
             $firstname = $user_info['firstname'];
             $completeName = $firstname.', '.$lastname;
-            $user_rol = $user_info['status'] == 1 ? Display::return_icon('teacher.png', get_lang('Trainer'), null, ICON_SIZE_TINY) : Display::return_icon('user.png', get_lang('Learner'), null, ICON_SIZE_TINY);
+            $user_rol = 1 == $user_info['status'] ? Display::return_icon('teacher.png', get_lang('Trainer'), null, ICON_SIZE_TINY) : Display::return_icon('user.png', get_lang('Learner'), null, ICON_SIZE_TINY);
             $status_icon_chat = null;
-            if (isset($user_info['user_is_online_in_chat']) && $user_info['user_is_online_in_chat'] == 1) {
+            if (isset($user_info['user_is_online_in_chat']) && 1 == $user_info['user_is_online_in_chat']) {
                 $status_icon_chat = Display::return_icon('online.png', get_lang('Online'));
             } else {
                 $status_icon_chat = Display::return_icon('offline.png', get_lang('Offline'));
@@ -1203,11 +1201,11 @@ class SocialManager extends UserManager
 
             $userPicture = $user_info['avatar'];
             $officialCode = '';
-            if (api_get_setting('show_official_code_whoisonline') == 'true') {
+            if ('true' == api_get_setting('show_official_code_whoisonline')) {
                 $officialCode .= '<div class="items-user-official-code"><p style="min-height: 30px;" title="'.get_lang('Code').'">'.$user_info['official_code'].'</p></div>';
             }
 
-            if ($hide === true) {
+            if (true === $hide) {
                 $completeName = '';
                 $firstname = '';
                 $lastname = '';
@@ -1218,7 +1216,7 @@ class SocialManager extends UserManager
             $url = null;
             // Anonymous users can't have access to the profile
             if (!api_is_anonymous()) {
-                if (api_get_setting('allow_social_tool') === 'true') {
+                if ('true' === api_get_setting('allow_social_tool')) {
                     $url = api_get_path(WEB_CODE_PATH).'social/profile.php?u='.$uid.$course_url;
                 } else {
                     $url = '?id='.$uid.$course_url;
@@ -1260,7 +1258,7 @@ class SocialManager extends UserManager
         $sql = "SELECT * FROM $user_table WHERE user_id = ".$safe_user_id;
         $result = Database::query($sql);
         $html = null;
-        if (Database::num_rows($result) == 1) {
+        if (1 == Database::num_rows($result)) {
             $user_object = Database::fetch_object($result);
             $userInfo = api_get_user_info($user_id);
             $alt = $userInfo['complete_name'].($currentUserId == $user_id ? '&nbsp;('.get_lang('Me').')' : '');
@@ -1277,7 +1275,7 @@ class SocialManager extends UserManager
             }
             $html .= '</div>';
 
-            if (api_get_setting('show_email_addresses') == 'true') {
+            if ('true' == api_get_setting('show_email_addresses')) {
                 $html .= Display::encrypted_mailto_link($user_object->email, $user_object->email).'<br />';
             }
 
@@ -1336,7 +1334,7 @@ class SocialManager extends UserManager
                 if (is_dir($sysdir.$file)) {
                     $subs = scandir($sysdir.$file);
                     foreach ($subs as $my => $sub) {
-                        if (substr($sub, 0, 1) != '.' && is_file($sysdir.$file.'/'.$sub)) {
+                        if ('.' != substr($sub, 0, 1) && is_file($sysdir.$file.'/'.$sub)) {
                             echo '<li><a href="'.$webdir.urlencode($file).'/'.urlencode($sub).'" target=_blank>'.$sub.'</a></li>';
                         }
                     }
@@ -1620,7 +1618,7 @@ class SocialManager extends UserManager
         $sqlLimit = " LIMIT $start, $length ";
         $messages = [];
         foreach ($sql as $index => $oneQuery) {
-            if ($index === 5) {
+            if (5 === $index) {
                 // Exception only for the forum query above (field name change)
                 $oneQuery .= ' ORDER BY post_date DESC '.$sqlLimit;
             } else {
@@ -1651,7 +1649,7 @@ class SocialManager extends UserManager
                     $row['post_title'] = '';
                     $row['forum_title'] = '';
                     $row['thread_url'] = '';
-                    if ($row['msg_status'] == MESSAGE_STATUS_FORUM) {
+                    if (MESSAGE_STATUS_FORUM == $row['msg_status']) {
                         /** @var CForumPost $post */
                         $post = $repo->find($row['id']);
                         /** @var CForumThread $thread */
@@ -1894,7 +1892,7 @@ class SocialManager extends UserManager
      */
     public static function readContentWithOpenGraph($link)
     {
-        if (strpos($link, "://") === false && substr($link, 0, 1) != "/") {
+        if (false === strpos($link, "://") && "/" != substr($link, 0, 1)) {
             $link = "http://".$link;
         }
         $graph = OpenGraph::fetch($link);
@@ -2000,7 +1998,7 @@ class SocialManager extends UserManager
         $groupId = 0,
         $show_full_profile = true
     ) {
-        if (api_get_setting('allow_social_tool') != 'true') {
+        if ('true' != api_get_setting('allow_social_tool')) {
             return '';
         }
 
@@ -2027,20 +2025,20 @@ class SocialManager extends UserManager
         }
 
         $vCardUserLink = Display::getVCardUserLink($userId);
-        if (isset($options['vcard']) && $options['vcard'] === false) {
+        if (isset($options['vcard']) && false === $options['vcard']) {
             $vCardUserLink = '';
         }
 
         $userInfo = api_get_user_info($userId, true, false, true, true);
 
-        if (isset($options['firstname']) && $options['firstname'] === false) {
+        if (isset($options['firstname']) && false === $options['firstname']) {
             $userInfo['firstname'] = '';
         }
-        if (isset($options['lastname']) && $options['lastname'] === false) {
+        if (isset($options['lastname']) && false === $options['lastname']) {
             $userInfo['lastname'] = '';
         }
 
-        if (isset($options['email']) && $options['email'] === false) {
+        if (isset($options['email']) && false === $options['email']) {
             $userInfo['email'] = '';
         }
 
@@ -2063,11 +2061,11 @@ class SocialManager extends UserManager
             ];
         }
 
-        if (isset($options['language']) && $options['language'] === false) {
+        if (isset($options['language']) && false === $options['language']) {
             $userInfo['language'] = '';
         }
 
-        if (isset($options['photo']) && $options['photo'] === false) {
+        if (isset($options['photo']) && false === $options['photo']) {
             $socialAvatarBlock = '';
         }
 
@@ -2086,7 +2084,7 @@ class SocialManager extends UserManager
             $template->assign('vcard_user_link', $vCardUserLink);
         }
 
-        if (api_get_setting('gamification_mode') === '1') {
+        if ('1' === api_get_setting('gamification_mode')) {
             $gamificationPoints = GamificationUtils::getTotalUserPoints(
                 $userId,
                 $userInfo['status']
@@ -2096,7 +2094,7 @@ class SocialManager extends UserManager
         }
         $chatEnabled = api_is_global_chat_enabled();
 
-        if (isset($options['chat']) && $options['chat'] === false) {
+        if (isset($options['chat']) && false === $options['chat']) {
             $chatEnabled = '';
         }
 
@@ -2348,7 +2346,7 @@ class SocialManager extends UserManager
     public static function wrapPost($message, $content)
     {
         $class = '';
-        if ($message['msg_status'] === MESSAGE_STATUS_PROMOTED) {
+        if (MESSAGE_STATUS_PROMOTED === $message['msg_status']) {
             $class = 'promoted_post';
         }
 
@@ -2417,7 +2415,7 @@ class SocialManager extends UserManager
      */
     public static function getSkillBlock($userId, $orientation = 'horizontal')
     {
-        if (Skill::isAllowed($userId, false) === false) {
+        if (false === Skill::isAllowed($userId, false)) {
             return '';
         }
 
@@ -2464,7 +2462,7 @@ class SocialManager extends UserManager
                 if (empty($data)) {
                     continue;
                 }
-                if (in_array($key, $fieldVisibilityKeys) && $fieldVisibility[$key] === false) {
+                if (in_array($key, $fieldVisibilityKeys) && false === $fieldVisibility[$key]) {
                     continue;
                 }
 
@@ -2491,12 +2489,12 @@ class SocialManager extends UserManager
                 }
 
                 // if is not visible skip
-                if ($extraFieldInfo['visible_to_self'] != 1) {
+                if (1 != $extraFieldInfo['visible_to_self']) {
                     continue;
                 }
 
                 // if is not visible to others skip also
-                if ($extraFieldInfo['visible_to_others'] != 1) {
+                if (1 != $extraFieldInfo['visible_to_others']) {
                     continue;
                 }
 
@@ -2595,13 +2593,13 @@ class SocialManager extends UserManager
                             break;
                         case ExtraField::FIELD_TYPE_SOCIAL_PROFILE:
                             $icon_path = UserManager::get_favicon_from_url($data);
-                            if (self::verifyUrl($icon_path) == false) {
+                            if (false == self::verifyUrl($icon_path)) {
                                 break;
                             }
                             $bottom = '0.2';
                             //quick hack for hi5
                             $domain = parse_url($icon_path, PHP_URL_HOST);
-                            if ($domain == 'www.hi5.com' || $domain == 'hi5.com') {
+                            if ('www.hi5.com' == $domain || 'hi5.com' == $domain) {
                                 $bottom = '-0.8';
                             }
                             $data = '<a href="'.$data.'">'
@@ -2657,7 +2655,7 @@ class SocialManager extends UserManager
                         default:
                             // Ofaj
                             // Converts "Date of birth" into "age"
-                            if ($key === 'terms_datedenaissance') {
+                            if ('terms_datedenaissance' === $key) {
                                 $dataArray = date_to_str_ago($data, 'UTC', true);
                                 $dataToString = isset($dataArray['years']) && !empty($dataArray['years']) ? $dataArray['years'] : 0;
                                 if (!empty($dataToString)) {
diff --git a/public/main/inc/lib/sortable_table.class.php b/public/main/inc/lib/sortable_table.class.php
index 216d73b0bf..d9dec7e988 100644
--- a/public/main/inc/lib/sortable_table.class.php
+++ b/public/main/inc/lib/sortable_table.class.php
@@ -13,8 +13,6 @@ use ChamiloSession as Session;
  * - click on the table header to sort the data
  * - choose how many items you see per page
  * - navigate through all data-pages.
- *
- * @package chamilo.library
  */
 class SortableTable extends HTML_Table
 {
@@ -159,7 +157,7 @@ class SortableTable extends HTML_Table
         }
 
         $cleanSessionData = Session::read('clean_sortable_table');
-        if ($cleanSessionData === true) {
+        if (true === $cleanSessionData) {
             $this->cleanUrlSessionParams();
         }
 
@@ -195,9 +193,9 @@ class SortableTable extends HTML_Table
             if (!in_array($my_session_direction, ['ASC', 'DESC'])) {
                 $this->direction = 'ASC';
             } else {
-                if ($my_session_direction === 'ASC') {
+                if ('ASC' === $my_session_direction) {
                     $this->direction = 'ASC';
-                } elseif ($my_session_direction === 'DESC') {
+                } elseif ('DESC' === $my_session_direction) {
                     $this->direction = 'DESC';
                 }
             }
@@ -208,9 +206,9 @@ class SortableTable extends HTML_Table
             if (!in_array($my_get_direction, ['ASC', 'DESC'])) {
                 $this->direction = 'ASC';
             } else {
-                if ($my_get_direction === 'ASC') {
+                if ('ASC' === $my_get_direction) {
                     $this->direction = 'ASC';
-                } elseif ($my_get_direction === 'DESC') {
+                } elseif ('DESC' === $my_get_direction) {
                     $this->direction = 'DESC';
                 }
             }
@@ -282,7 +280,7 @@ class SortableTable extends HTML_Table
      */
     public function get_pager()
     {
-        if ($this->pager === null) {
+        if (null === $this->pager) {
             $params['mode'] = 'Sliding';
             $params['perPage'] = $this->per_page;
             $params['totalItems'] = $this->get_total_number_of_items();
@@ -351,7 +349,7 @@ class SortableTable extends HTML_Table
     {
         $empty_table = false;
         $content = $this->get_table_html();
-        if ($this->get_total_number_of_items() == 0) {
+        if (0 == $this->get_total_number_of_items()) {
             $cols = $this->getColCount();
             $this->setCellAttributes(
                 1,
@@ -465,7 +463,7 @@ class SortableTable extends HTML_Table
     public function display_grid()
     {
         $empty_table = false;
-        if ($this->get_total_number_of_items() == 0) {
+        if (0 == $this->get_total_number_of_items()) {
             $message_empty = api_xml_http_response_encode(get_lang('Empty'));
             $this->setCellContents(1, 0, $message_empty);
             $empty_table = true;
@@ -552,7 +550,7 @@ class SortableTable extends HTML_Table
         $grid_class = []
     ) {
         $empty_table = false;
-        if ($this->get_total_number_of_items() == 0) {
+        if (0 == $this->get_total_number_of_items()) {
             $message_empty = api_xml_http_response_encode(get_lang('Empty'));
             $this->setCellContents(1, 0, $message_empty);
             $empty_table = true;
@@ -598,7 +596,7 @@ class SortableTable extends HTML_Table
         if (is_array($visibility_options)) {
             $filter = false; // The 2nd condition of the if will be loaded
         } else {
-            $filter = $visibility_options !== false;
+            $filter = false !== $visibility_options;
         }
 
         $item_css_class = $item_css_style = $grid_css_class = $grid_css_style = '';
@@ -700,7 +698,7 @@ class SortableTable extends HTML_Table
             }
         }
 
-        if ($this->odd_even_rows_enabled == true) {
+        if (true == $this->odd_even_rows_enabled) {
             $this->altRowAttributes(
                 0,
                 ['class' => 'row_odd'],
@@ -754,7 +752,7 @@ class SortableTable extends HTML_Table
             return '';
         }
 
-        if ($this->hideItemSelector === true) {
+        if (true === $this->hideItemSelector) {
             return '';
         }
         $result[] = '<form method="GET" action="'.api_get_self().'" style="display:inline;">';
@@ -835,7 +833,7 @@ class SortableTable extends HTML_Table
 
             $column = $counter;
             $param['direction'] = 'ASC';
-            if ($this->column == $column && $this->direction == 'ASC') {
+            if ($this->column == $column && 'ASC' == $this->direction) {
                 $param['direction'] = 'DESC';
             }
 
@@ -851,7 +849,7 @@ class SortableTable extends HTML_Table
                 $link .= $this->get_additional_url_paramstring();
                 $link .= '">'.$label.'</a>';
                 if ($this->column == $column) {
-                    $link .= $this->direction == 'ASC' ? ' &#8595;' : ' &#8593;';
+                    $link .= 'ASC' == $this->direction ? ' &#8595;' : ' &#8593;';
                 }
             }
             $this->setHeaderContents(0, $column, $link);
@@ -1067,7 +1065,7 @@ class SortableTable extends HTML_Table
      */
     public function get_total_number_of_items()
     {
-        if ($this->total_number_of_items == -1 && !is_null($this->get_total_number_function)) {
+        if (-1 == $this->total_number_of_items && !is_null($this->get_total_number_function)) {
             $this->total_number_of_items = call_user_func(
                 $this->get_total_number_function,
                 $this->getDataFunctionParams()
@@ -1108,7 +1106,7 @@ class SortableTable extends HTML_Table
         $sort = null
     ) {
         $data = [];
-        if ($this->get_data_function !== null) {
+        if (null !== $this->get_data_function) {
             $data = call_user_func(
                 $this->get_data_function,
                 $from,
diff --git a/public/main/inc/lib/specific_fields_manager.lib.php b/public/main/inc/lib/specific_fields_manager.lib.php
index 3468f731f0..ab3b0c20d7 100644
--- a/public/main/inc/lib/specific_fields_manager.lib.php
+++ b/public/main/inc/lib/specific_fields_manager.lib.php
@@ -3,8 +3,6 @@
  * Manage specific tools.
  *
  * @todo convert into a class
- *
- * @package chamilo.library
  */
 
 // Database table definitions
@@ -27,7 +25,7 @@ function add_specific_field($name)
     $_safe_name = Database::escape_string($name);
     $_safe_code = substr($_safe_name, 0, 1);
     $_safe_code = get_specific_field_code_from_name($_safe_code);
-    if ($_safe_code === false) {
+    if (false === $_safe_code) {
         return false;
     }
     $sql = sprintf($sql, $table_sf, $_safe_code, $_safe_name);
diff --git a/public/main/inc/lib/statistics.lib.php b/public/main/inc/lib/statistics.lib.php
index ff4820592a..92038af5ed 100644
--- a/public/main/inc/lib/statistics.lib.php
+++ b/public/main/inc/lib/statistics.lib.php
@@ -3,8 +3,6 @@
 
 /**
  * This class provides some functions for statistics.
- *
- * @package chamilo.statistics
  */
 class Statistics
 {
@@ -344,8 +342,8 @@ class Statistics
         $res = Database::query($sql);
         $activities = [];
         while ($row = Database::fetch_row($res)) {
-            if (strpos($row[1], '_object') === false &&
-                strpos($row[1], '_array') === false
+            if (false === strpos($row[1], '_object') &&
+                false === strpos($row[1], '_array')
             ) {
                 $row[2] = $row[2];
             } else {
@@ -484,7 +482,7 @@ class Statistics
             }
             $percentage = ($total > 0 ? number_format(100 * $number / $total, 1, ',', '.') : '0');
 
-            echo '<tr class="row_'.($i % 2 == 0 ? 'odd' : 'even').'">
+            echo '<tr class="row_'.(0 == $i % 2 ? 'odd' : 'even').'">
                     <td width="150">'.$subtitle.'</td>
                     <td width="550">'.Display::bar_progress($percentage, false).'</td>
                     <td align="right">'.$number_label.'</td>';
@@ -573,7 +571,7 @@ class Statistics
             $res_last_x = Database::query($sql_last_x);
             $result_last_x = [];
             while ($obj = Database::fetch_object($res_last_x)) {
-                $stat_date = ($type === 'day') ? $periodCollection[$obj->stat_date] : $obj->stat_date;
+                $stat_date = ('day' === $type) ? $periodCollection[$obj->stat_date] : $obj->stat_date;
                 $result_last_x[$stat_date] = $obj->number_of_logins;
             }
             self::printStats(get_lang('Last logins').' ('.$period.')', $result_last_x, true);
@@ -641,7 +639,7 @@ class Statistics
             $localEndDate = api_get_local_time($endDate, null, null, false, false);
 
             $label = sprintf(get_lang('Last %s days'), $day);
-            if ($day == 1) {
+            if (1 == $day) {
                 $label = get_lang('Today');
             }
             $label .= " <br /> $localDate - $localEndDate";
diff --git a/public/main/inc/lib/sub_language.class.php b/public/main/inc/lib/sub_language.class.php
index 1866d1da61..38dc9ca52a 100644
--- a/public/main/inc/lib/sub_language.class.php
+++ b/public/main/inc/lib/sub_language.class.php
@@ -3,8 +3,6 @@
 
 /**
  * Class SubLanguageManager.
- *
- * @package chamilo.admin.sublanguage
  */
 class SubLanguageManager
 {
@@ -51,10 +49,10 @@ class SubLanguageManager
         $content_dir = [];
         if (is_dir($path)) {
             if ($dh = opendir($path)) {
-                while (($file = readdir($dh)) !== false) {
-                    if ($file[0] != '.' && substr($file, -4, strlen($file)) == '.php') {
+                while (false !== ($file = readdir($dh))) {
+                    if ('.' != $file[0] && '.php' == substr($file, -4, strlen($file))) {
                         if ($only_main_name) {
-                            if ($file != '' && strpos($file, '.inc.php')) {
+                            if ('' != $file && strpos($file, '.inc.php')) {
                                 $content_dir[] = substr($file, 0, strpos($file, '.inc.php'));
                             }
                         } else {
@@ -131,7 +129,7 @@ class SubLanguageManager
         }
         $info_file = file($system_path_file);
         foreach ($info_file as $line) {
-            if (substr($line, 0, 1) != '$') {
+            if ('$' != substr($line, 0, 1)) {
                 continue;
             }
             list($var, $val) = explode('=', $line, 2);
@@ -175,7 +173,7 @@ class SubLanguageManager
         $new_data = $new_variable.'='.$new_term;
         $resource = @fopen($path_file, "a");
         if (file_exists($path_file) && $resource) {
-            if (fwrite($resource, $new_data.PHP_EOL) === false) {
+            if (false === fwrite($resource, $new_data.PHP_EOL)) {
                 //not allow to write
                 $return_value = false;
             } else {
@@ -229,12 +227,12 @@ class SubLanguageManager
         $sql = 'SELECT dokeos_folder FROM '.$table.'
                 WHERE parent_id = '.$parent_id.' and id = '.$sub_language_id;
         $res = Database::query($sql);
-        if ($res === false or Database::num_rows($res) < 1) {
+        if (false === $res or Database::num_rows($res) < 1) {
             return false;
         }
         $row = Database::fetch_assoc($res);
         $res = self::remove_language_directory($row['dokeos_folder']);
-        if ($res === false) {
+        if (false === $res) {
             return false;
         } //can't delete dir, so do not delete language record
         $sql = 'DELETE FROM '.$table.'
@@ -289,7 +287,7 @@ class SubLanguageManager
                 WHERE id="'.intval($language_id).'"';
         $rs = Database::query($sql);
         if (Database::num_rows($rs) > 0) {
-            if (Database::result($rs, 0, 'count') == 1) {
+            if (1 == Database::result($rs, 0, 'count')) {
                 return true;
             } else {
                 return false;
@@ -335,7 +333,7 @@ class SubLanguageManager
                 WHERE id = '.intval($language_id).' AND NOT ISNULL(parent_id)';
         $rs = Database::query($sql);
 
-        if (Database::num_rows($rs) > 0 && Database::result($rs, '0', 'count') == 1) {
+        if (Database::num_rows($rs) > 0 && 1 == Database::result($rs, '0', 'count')) {
             return true;
         } else {
             return false;
@@ -375,7 +373,7 @@ class SubLanguageManager
                 WHERE parent_id= '.intval($language_id).' AND NOT ISNULL(parent_id);';
         $rs = Database::query($sql);
 
-        if (Database::num_rows($rs) > 0 && Database::result($rs, '0', 'count') == 1) {
+        if (Database::num_rows($rs) > 0 && 1 == Database::result($rs, '0', 'count')) {
             return true;
         } else {
             return false;
@@ -396,7 +394,7 @@ class SubLanguageManager
                 WHERE id = ".intval($language_id)."";
         $result = Database::query($sql);
 
-        return $result !== false; //only return false on sql error
+        return false !== $result; //only return false on sql error
     }
 
     /**
@@ -413,7 +411,7 @@ class SubLanguageManager
                 WHERE id = ".intval($language_id)."";
         $result = Database::query($sql);
 
-        return $result !== false; //only return false on sql error
+        return false !== $result; //only return false on sql error
     }
 
     /**
@@ -444,7 +442,7 @@ class SubLanguageManager
             $lang['english_name']
         );
 
-        return $result_2 !== false;
+        return false !== $result_2;
     }
 
     /**
@@ -484,7 +482,7 @@ class SubLanguageManager
                 )
                 ";
         $result = Database::query($sql);
-        if (Database::num_rows($result) == 0) {
+        if (0 == Database::num_rows($result)) {
             return null;
         }
         $row = Database::fetch_array($result);
@@ -545,7 +543,7 @@ class SubLanguageManager
                 }
                 $name = self::getLanguageFromIsocode($code);
 
-                if ($name !== false) {
+                if (false !== $name) {
                     return $name;
                 }
             }
diff --git a/public/main/inc/lib/system_announcements.lib.php b/public/main/inc/lib/system_announcements.lib.php
index de716a60c3..fcb5462a64 100644
--- a/public/main/inc/lib/system_announcements.lib.php
+++ b/public/main/inc/lib/system_announcements.lib.php
@@ -179,7 +179,7 @@ class SystemAnnouncementManager
             $sql .= " AND access_url_id IN ('1', '$current_access_url_id')";
         }
 
-        if (!isset($_GET['start']) || $_GET['start'] == 0) {
+        if (!isset($_GET['start']) || 0 == $_GET['start']) {
             $sql .= " ORDER BY date_start DESC LIMIT ".$start.",20";
         } else {
             $sql .= " ORDER BY date_start DESC LIMIT ".($start + 1).",20";
@@ -238,7 +238,7 @@ class SystemAnnouncementManager
         $next = ((int) $_GET['start'] + 19);
         $prev = ((int) $_GET['start'] - 19);
         $content = '';
-        if (!isset($_GET['start']) || $_GET['start'] == 0) {
+        if (!isset($_GET['start']) || 0 == $_GET['start']) {
             if ($nb_announcement > 20) {
                 $content .= '<a href="news_list.php?start='.$next.'">'.get_lang('Next').' >> </a>';
             }
@@ -428,7 +428,7 @@ class SystemAnnouncementManager
             return false;
         }
 
-        if (strlen(trim($title)) == 0) {
+        if (0 == strlen(trim($title))) {
             Display::addFlash(
                 Display::return_message(get_lang('Please enter a title'), 'warning')
             );
@@ -487,7 +487,7 @@ class SystemAnnouncementManager
                     true
                 );
             } else {
-                if ($send_mail == 1) {
+                if (1 == $send_mail) {
                     self::send_system_announcement_by_email(
                         $resultId,
                         $visibility
@@ -531,17 +531,17 @@ class SystemAnnouncementManager
              WHERE announcement_id=".intval($announcement_id)
         );
 
-        if ($res === false) {
+        if (false === $res) {
             return false;
         }
 
         foreach ($group_array as $group_id) {
-            if (intval($group_id) != 0) {
+            if (0 != intval($group_id)) {
                 $sql = "INSERT INTO $tbl_announcement_group SET
                         announcement_id=".intval($announcement_id).",
                         group_id=".intval($group_id);
                 $res = Database::query($sql);
-                if ($res === false) {
+                if (false === $res) {
                     return false;
                 }
             }
@@ -639,7 +639,7 @@ class SystemAnnouncementManager
             return false;
         }
 
-        if (strlen(trim($title)) == 0) {
+        if (0 == strlen(trim($title))) {
             echo Display::return_message(get_lang('Please enter a title'));
 
             return false;
@@ -689,7 +689,6 @@ class SystemAnnouncementManager
                 $params,
                 ['id = ? ' => $id]
             );
-
         }
 
         foreach ($list as $key => $title) {
@@ -705,7 +704,7 @@ class SystemAnnouncementManager
                 true
             );
         } else {
-            if ($send_mail == 1) {
+            if (1 == $send_mail) {
                 self::send_system_announcement_by_email(
                     $id,
                     $visibility
@@ -729,7 +728,7 @@ class SystemAnnouncementManager
         $id = (int) $id;
         $sql = "DELETE FROM $table WHERE id =".$id;
         $res = Database::query($sql);
-        if ($res === false) {
+        if (false === $res) {
             return false;
         }
         self::deleteAnnouncementPicture($id);
@@ -779,7 +778,7 @@ class SystemAnnouncementManager
                 WHERE id='".$id."'";
         $res = Database::query($sql);
 
-        if ($res === false) {
+        if (false === $res) {
             return false;
         }
 
@@ -831,17 +830,17 @@ class SystemAnnouncementManager
             $urlCondition = " AND access_url_id = '".$current_access_url_id."' ";
         }
 
-        if ($teacher != 0 && $student == 0) {
+        if (0 != $teacher && 0 == $student) {
             $sql = "SELECT DISTINCT u.user_id FROM $user_table u $urlJoin
                     WHERE status = '1' $urlCondition";
         }
 
-        if ($teacher == 0 && $student != 0) {
+        if (0 == $teacher && 0 != $student) {
             $sql = "SELECT DISTINCT u.user_id FROM $user_table u $urlJoin
                     WHERE status = '5' $urlCondition";
         }
 
-        if ($teacher != 0 && $student != 0) {
+        if (0 != $teacher && 0 != $student) {
             $sql = "SELECT DISTINCT u.user_id FROM $user_table u $urlJoin
                     WHERE 1 = 1 $urlCondition";
         }
@@ -867,7 +866,7 @@ class SystemAnnouncementManager
             $promotionList = $promotion->get_all_promotions_by_career_id($announcement->career_id);
             if (isset($announcement->promotion_id) && !empty($announcement->promotion_id)) {
                 $promotionList = [];
-                $promotionList[]  = $promotion->get($announcement->promotion_id);
+                $promotionList[] = $promotion->get($announcement->promotion_id);
             }
             if (!empty($promotionList)) {
                 foreach ($promotionList as $promotion) {
@@ -884,12 +883,12 @@ class SystemAnnouncementManager
             return true;
         }
 
-        if ((empty($teacher) || $teacher == '0') && (empty($student) || $student == '0')) {
+        if ((empty($teacher) || '0' == $teacher) && (empty($student) || '0' == $student)) {
             return true;
         }
 
         $result = Database::query($sql);
-        if ($result === false) {
+        if (false === $result) {
             return false;
         }
 
@@ -967,7 +966,7 @@ class SystemAnnouncementManager
             }
         }
 
-        if (count($announcements) === 0) {
+        if (0 === count($announcements)) {
             return [];
         }
 
diff --git a/public/main/inc/lib/table_sort.class.php b/public/main/inc/lib/table_sort.class.php
index ee191e0381..0015679939 100644
--- a/public/main/inc/lib/table_sort.class.php
+++ b/public/main/inc/lib/table_sort.class.php
@@ -3,8 +3,6 @@
 
 /**
  * This is a library with some functions to sort tabular data.
- *
- * @package chamilo.library
  */
 define('SORT_DATE', 3);
 define('SORT_IMAGE', 4);
@@ -43,7 +41,7 @@ class TableSort
             return $data;
         }
 
-        if ($type == SORT_REGULAR) {
+        if (SORT_REGULAR == $type) {
             $type = SORT_STRING;
             if (self::is_image_column($data, $column)) {
                 $type = SORT_IMAGE;
@@ -70,13 +68,13 @@ class TableSort
      */
     public static function getSortFunction($type, $direction, $column)
     {
-        $compareOperator = $direction == SORT_ASC ? '>' : '<=';
+        $compareOperator = SORT_ASC == $direction ? '>' : '<=';
 
         switch ($type) {
             case SORT_NUMERIC:
                 $function = function ($a, $b) use ($column, $compareOperator) {
                     $result = strip_tags($a[$column]) <= strip_tags($b[$column]);
-                    if ($compareOperator === '>') {
+                    if ('>' === $compareOperator) {
                         $result = strip_tags($a[$column]) > strip_tags($b[$column]);
                     }
 
@@ -89,7 +87,7 @@ class TableSort
                         api_strtolower(strip_tags($a[$column], "<img>")),
                         api_strtolower(strip_tags($b[$column], "<img>"))
                     ) <= 0;
-                    if ($compareOperator === '>') {
+                    if ('>' === $compareOperator) {
                         $result = api_strnatcmp(
                             api_strtolower(strip_tags($a[$column], "<img>")),
                             api_strtolower(strip_tags($b[$column], "<img>"))
@@ -103,7 +101,7 @@ class TableSort
             case SORT_DATE:
                 $function = function ($a, $b) use ($column, $compareOperator) {
                     $result = strtotime(strip_tags($a[$column])) <= strtotime(strip_tags($b[$column]));
-                    if ($compareOperator === '>') {
+                    if ('>' === $compareOperator) {
                         $result = strtotime(strip_tags($a[$column])) > strtotime(strip_tags($b[$column]));
                     }
 
@@ -117,7 +115,7 @@ class TableSort
                         api_strtolower(strip_tags($a[$column])),
                         api_strtolower(strip_tags($b[$column]))
                     ) <= 0;
-                    if ($compareOperator === '>') {
+                    if ('>' === $compareOperator) {
                         $result = api_strnatcmp(
                             api_strtolower(strip_tags($a[$column])),
                             api_strtolower(strip_tags($b[$column]))
@@ -175,7 +173,7 @@ class TableSort
             $column = isset($column_order[$column]) ? $column_order[$column] : $column;
         }
 
-        if ($type == SORT_REGULAR) {
+        if (SORT_REGULAR == $type) {
             if (self::is_image_column($data, $column)) {
                 $type = SORT_IMAGE;
             } elseif (self::is_date_column($data, $column)) {
@@ -193,7 +191,7 @@ class TableSort
             $new_data = [];
             if (!empty($data)) {
                 foreach ($data as $document) {
-                    if ($document['type'] === 'folder') {
+                    if ('folder' === $document['type']) {
                         $docs_to_sort[$document['id']] = api_strtolower($document['name']);
                     } else {
                         $folder_to_sort[$document['id']] = api_strtolower($document['name']);
@@ -201,7 +199,7 @@ class TableSort
                     $new_data[$document['id']] = $document;
                 }
 
-                if ($direction == SORT_ASC) {
+                if (SORT_ASC == $direction) {
                     if (!empty($docs_to_sort)) {
                         api_natsort($docs_to_sort);
                     }
@@ -302,11 +300,11 @@ class TableSort
     {
         $is_date = true;
         foreach ($data as $index => &$row) {
-            if (strlen(strip_tags($row[$column])) != 0) {
+            if (0 != strlen(strip_tags($row[$column]))) {
                 $check_date = strtotime(strip_tags($row[$column]));
                 // strtotime Returns a timestamp on success, FALSE otherwise.
                 // Previous to PHP 5.1.0, this function would return -1 on failure.
-                $is_date &= ($check_date != -1 && $check_date);
+                $is_date &= (-1 != $check_date && $check_date);
             } else {
                 $is_date &= false;
             }
@@ -336,7 +334,7 @@ class TableSort
                 // at least one img-tag
                 $is_image &= strlen(trim(strip_tags($row[$column], '<img>'))) > 0;
                 // and no text outside attribute-values
-                $is_image &= strlen(trim(strip_tags($row[$column]))) == 0;
+                $is_image &= 0 == strlen(trim(strip_tags($row[$column])));
             }
             if (!$is_image) {
                 break;
diff --git a/public/main/inc/lib/template.lib.php b/public/main/inc/lib/template.lib.php
index 144cb39797..bde437a820 100644
--- a/public/main/inc/lib/template.lib.php
+++ b/public/main/inc/lib/template.lib.php
@@ -82,7 +82,7 @@ class Template
 
         if (empty($this->show_learnpath)) {
             $origin = api_get_origin();
-            if ($origin === 'learnpath') {
+            if ('learnpath' === $origin) {
                 $this->show_learnpath = true;
                 $show_footer = false;
                 $show_header = false;
@@ -138,7 +138,7 @@ class Template
         }
 
         $content = '';
-        if (api_get_setting('enable_help_link') == 'true') {
+        if ('true' == api_get_setting('enable_help_link')) {
             if (!empty($help)) {
                 $help = Security::remove_XSS($help);
                 $content = '<div class="help">';
@@ -313,11 +313,11 @@ class Template
         $courseToolBar = '';
         $show_course_navigation_menu = '';
         if (!empty($this->course_id) && $this->user_is_logged_in) {
-            if (api_get_setting('show_toolshortcuts') !== 'false') {
+            if ('false' !== api_get_setting('show_toolshortcuts')) {
                 // Course toolbar
                 $courseToolBar = CourseHome::show_navigation_tool_shortcuts();
             }
-            if (api_get_setting('show_navigation_menu') !== 'false') {
+            if ('false' !== api_get_setting('show_navigation_menu')) {
                 //Course toolbar
                 $show_course_navigation_menu = CourseHome::show_navigation_menu();
             }
@@ -350,7 +350,7 @@ class Template
 
         // If a template folder has been manually defined, search for the right
         // file, and if not found, go for the same file in the default template
-        if ($defaultFolder && $defaultFolder != 'default') {
+        if ($defaultFolder && 'default' != $defaultFolder) {
             // Avoid missing template error, use the default file.
             if (file_exists($sysTemplatePath."$defaultFolder/$name")) {
                 return "$defaultFolder/$name";
@@ -509,7 +509,7 @@ class Template
 
         if (!empty($features) && isset($features['features'])) {
             foreach ($features['features'] as $feature) {
-                if ($feature === 'vrview') {
+                if ('vrview' === $feature) {
                     continue;
                 }
                 $bowerCSSFiles[] = "mediaelement/plugins/$feature/$feature.css";
@@ -575,7 +575,7 @@ class Template
         }
 
         $navigator_info = api_get_navigator();
-        if ($navigator_info['name'] == 'Internet Explorer' && $navigator_info['version'] == '6') {
+        if ('Internet Explorer' == $navigator_info['name'] && '6' == $navigator_info['version']) {
             $css_file_to_string .= 'img, div { behavior: url('.api_get_path(WEB_LIBRARY_PATH).'javascript/iepngfix/iepngfix.htc) } '."\n";
         }
 
@@ -610,7 +610,7 @@ class Template
         $isoCode = api_get_language_isocode();
         $selectLink = 'bootstrap-select/dist/js/i18n/defaults-'.$isoCode.'_'.strtoupper($isoCode).'.min.js';
 
-        if ($isoCode == 'en') {
+        if ('en' == $isoCode) {
             $selectLink = 'bootstrap-select/dist/js/i18n/defaults-'.$isoCode.'_US.min.js';
         }
         // JS files
@@ -618,19 +618,19 @@ class Template
             'chosen/chosen.jquery.min.js',
         ];
 
-        $viewBySession = api_get_setting('my_courses_view_by_session') === 'true';
+        $viewBySession = 'true' === api_get_setting('my_courses_view_by_session');
 
         if (api_is_global_chat_enabled() || $viewBySession) {
             // Do not include the global chat in LP
-            if ($this->show_learnpath == false &&
-                $this->show_footer == true &&
-                $this->hide_global_chat == false
+            if (false == $this->show_learnpath &&
+                true == $this->show_footer &&
+                false == $this->hide_global_chat
             ) {
                 $js_files[] = 'chat/js/chat.js';
             }
         }
 
-        if (api_get_setting('accessibility_font_resize') === 'true') {
+        if ('true' === api_get_setting('accessibility_font_resize')) {
             $js_files[] = 'fontresize.js';
         }
 
@@ -659,7 +659,7 @@ class Template
         $features = api_get_configuration_value('video_features');
         if (!empty($features) && isset($features['features'])) {
             foreach ($features['features'] as $feature) {
-                if ($feature === 'vrview') {
+                if ('vrview' === $feature) {
                     continue;
                 }
                 $bowerJsFiles[] = "mediaelement/plugins/$feature/$feature.js";
@@ -670,11 +670,11 @@ class Template
             $bowerJsFiles[] = 'ckeditor/ckeditor.js';
         }
 
-        if (api_get_setting('include_asciimathml_script') === 'true') {
+        if ('true' === api_get_setting('include_asciimathml_script')) {
             $bowerJsFiles[] = 'MathJax/MathJax.js?config=TeX-MML-AM_HTMLorMML';
         }
 
-        if ($isoCode != 'en') {
+        if ('en' != $isoCode) {
             $bowerJsFiles[] = 'jqueryui-timepicker-addon/dist/i18n/jquery-ui-timepicker-'.$isoCode.'.js';
             $bowerJsFiles[] = 'jquery-ui/ui/minified/i18n/datepicker-'.$isoCode.'.min.js';
         }
@@ -688,7 +688,7 @@ class Template
         }
 
         // Loading email_editor js
-        if (!api_is_anonymous() && api_get_setting('allow_email_editor') == 'true') {
+        if (!api_is_anonymous() && 'true' == api_get_setting('allow_email_editor')) {
             $template = $this->get_template('mail_editor/email_link.js.tpl');
             $js_file_to_string .= $this->fetch($template);
         }
@@ -764,7 +764,7 @@ class Template
         $js_files = [];
         if (api_is_global_chat_enabled()) {
             //Do not include the global chat in LP
-            if ($this->show_learnpath == false && $this->show_footer == true && $this->hide_global_chat == false) {
+            if (false == $this->show_learnpath && true == $this->show_footer && false == $this->hide_global_chat) {
                 $js_files[] = 'chat/js/chat.js';
             }
         }
@@ -873,7 +873,7 @@ class Template
                 case 'account_inactive':
                     $message = get_lang('Account inactive');
 
-                    if (api_get_setting('allow_registration') === 'confirmation') {
+                    if ('confirmation' === api_get_setting('allow_registration')) {
                         $message = get_lang('Your account is inactive because you have not confirmed it yet. Check your email and follow the instructions or click the following link to resend the email').PHP_EOL;
                         $message .= Display::url(
                             get_lang('Send confirmation mail again'),
@@ -955,7 +955,7 @@ class Template
 
         // Captcha
         $captcha = api_get_setting('allow_captcha');
-        $allowCaptcha = $captcha === 'true';
+        $allowCaptcha = 'true' === $captcha;
 
         if ($allowCaptcha) {
             $useCaptcha = isset($_SESSION['loginFailed']) ? $_SESSION['loginFailed'] : null;
@@ -1107,7 +1107,7 @@ class Template
             [],
             ICON_SIZE_LARGE
         );
-        if (api_get_setting('show_link_bug_notification') === 'true' && $this->user_is_logged_in) {
+        if ('true' === api_get_setting('show_link_bug_notification') && $this->user_is_logged_in) {
             $rightFloatMenu = '<div class="report">
 		        <a href="https://github.com/chamilo/chamilo-lms/wiki/How-to-report-issues" target="_blank">
                     '.$iconBug.'
@@ -1115,7 +1115,7 @@ class Template
 		        </div>';
         }
 
-        if (api_get_setting('show_link_ticket_notification') === 'true' &&
+        if ('true' === api_get_setting('show_link_ticket_notification') &&
             $this->user_is_logged_in
         ) {
             // by default is project_id = 1
@@ -1186,7 +1186,7 @@ class Template
             'directory' => $course['directory'],
             'session_id' => api_get_session_id(),
             'user_is_teacher' => api_is_course_admin(),
-            'student_view' => (!empty($_GET['isStudentView']) && $_GET['isStudentView'] == 'true'),
+            'student_view' => (!empty($_GET['isStudentView']) && 'true' == $_GET['isStudentView']),
         ];
         $this->assign('course_code', $course['code']);
         $this->assign('_c', $_c);
@@ -1263,7 +1263,7 @@ class Template
         if (!empty($course_title)) {
             $title_list[] = $course_title;
         }
-        if ($nameTools != '') {
+        if ('' != $nameTools) {
             $title_list[] = $nameTools;
         }
 
@@ -1286,7 +1286,7 @@ class Template
         $this->setCssCustomFiles();
 
         $browser = api_browser_support('check_browser');
-        if ($browser[0] == 'Internet Explorer' && $browser[1] >= '11') {
+        if ('Internet Explorer' == $browser[0] && $browser[1] >= '11') {
             $browser_head = '<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE9" />';
             $this->assign('browser_specific_head', $browser_head);
         }
@@ -1315,14 +1315,14 @@ class Template
 
         // Logout link
         $hideLogout = api_get_setting('hide_logout_button');
-        if ($hideLogout === 'true') {
+        if ('true' === $hideLogout) {
             $this->assign('logout_link', null);
         } else {
             $this->assign('logout_link', api_get_path(WEB_PATH).'index.php?logout=logout&uid='.api_get_user_id());
         }
 
         // Profile link
-        if (api_get_setting('allow_social_tool') == 'true') {
+        if ('true' == api_get_setting('allow_social_tool')) {
             $profile_url = api_get_path(WEB_CODE_PATH).'social/home.php';
         } else {
             $profile_url = api_get_path(WEB_CODE_PATH).'auth/profile.php';
@@ -1333,7 +1333,7 @@ class Template
         //Message link
         $message_link = null;
         $message_url = null;
-        if (api_get_setting('allow_message_tool') == 'true') {
+        if ('true' == api_get_setting('allow_message_tool')) {
             $message_url = api_get_path(WEB_CODE_PATH).'messages/inbox.php';
             $message_link = '<a href="'.api_get_path(WEB_CODE_PATH).'messages/inbox.php">'.get_lang('Inbox').'</a>';
         }
@@ -1349,7 +1349,7 @@ class Template
 
         // Certificate Link
         $allow = api_get_configuration_value('certificate.hide_my_certificate_link');
-        if ($allow === false) {
+        if (false === $allow) {
             $certificateUrl = api_get_path(WEB_CODE_PATH).'gradebook/my_certificates.php';
             $certificateLink = Display::url(
                 get_lang('My certificates'),
@@ -1370,7 +1370,7 @@ class Template
 
         $breadcrumb = '';
         // Hide breadcrumb in LP
-        if ($this->show_learnpath == false) {
+        if (false == $this->show_learnpath) {
             $breadcrumb = return_breadcrumb(
                 $interbreadcrumb,
                 $language_file,
@@ -1563,7 +1563,7 @@ class Template
     private function assignAccessibilityBlock()
     {
         $resize = '';
-        if (api_get_setting('accessibility_font_resize') == 'true') {
+        if ('true' == api_get_setting('accessibility_font_resize')) {
             $resize .= '<div class="resize_font">';
             $resize .= '<div class="btn-group">';
             $resize .= '<a title="'.get_lang('Decrease the font size').'" href="#" class="decrease_font btn btn-default"><em class="fa fa-font"></em></a>';
@@ -1610,7 +1610,7 @@ class Template
                 // Check session ID from session/id/about (see .htaccess)
                 $sessionId = isset($_GET['session_id']) ? intval($_GET['session_id']) : 0;
 
-                if ($courseId != false) {
+                if (false != $courseId) {
                     // If we are inside a course (even if within a session), publish info about the course
                     $course = api_get_course_entity($courseId);
                     // @TODO: support right-to-left in title
@@ -1635,7 +1635,7 @@ class Template
                     } else {
                         $socialMeta .= $this->getMetaPortalImagePath($metaTitle);
                     }
-                } elseif ($sessionId !== 0) {
+                } elseif (0 !== $sessionId) {
                     // If we are on a session "about" screen, publish info about the session
                     $em = Database::getManager();
                     $session = $em->find('ChamiloCoreBundle:Session', $sessionId);
diff --git a/public/main/inc/lib/text.lib.php b/public/main/inc/lib/text.lib.php
index 41b4bd61f3..3d5cf8a2bf 100644
--- a/public/main/inc/lib/text.lib.php
+++ b/public/main/inc/lib/text.lib.php
@@ -5,8 +5,6 @@
  * This is the text library for Chamilo.
  * It is loaded during the global initialization,
  * so the functions below are available everywhere.
- *
- * @package chamilo.library
  */
 define('EXERCISE_NUMBER_OF_DECIMALS', 2);
 
@@ -80,7 +78,7 @@ function api_set_encoding_html(&$string, $encoding)
         }
     } else {
         $count = 1;
-        if (strpos('</head>', strtolower($string)) !== false) {
+        if (false !== strpos('</head>', strtolower($string))) {
             $string = str_ireplace(
                 '</head>',
                 '<meta http-equiv="Content-Type" content="text/html; charset='.$encoding.'"/></head>',
@@ -233,7 +231,7 @@ function _api_convert_encoding_xml(&$string, $to_encoding, $from_encoding)
         );
     }
     if (!preg_match(_PCRE_XML_ENCODING, $string)) {
-        if (strpos($matches[0], 'standalone') !== false) {
+        if (false !== strpos($matches[0], 'standalone')) {
             // The encoding option should precede the standalone option,
             // othewise DOMDocument fails to load the document.
             $replace = str_replace('standalone', ' encoding="'.$to_encoding.'" standalone', $matches[0]);
@@ -518,7 +516,7 @@ function esc_url($url, $protocols = null, $_context = 'display')
      * presume it needs http:// appended (unless a relative
      * link starting with /, # or ? or a php file).
      */
-    if (strpos($url, ':') === false && !in_array($url[0], ['/', '#', '?']) &&
+    if (false === strpos($url, ':') && !in_array($url[0], ['/', '#', '?']) &&
         !preg_match('/^[a-z0-9-]+?\.php/i', $url)) {
         $url = 'http://'.$url;
     }
@@ -575,7 +573,7 @@ function _make_web_ftp_clickable_cb($matches)
     }
 
     // removed trailing [.,;:)] from URL
-    if (in_array(substr($dest, -1), ['.', ',', ';', ':', ')']) === true) {
+    if (true === in_array(substr($dest, -1), ['.', ',', ';', ':', ')'])) {
         $ret = substr($dest, -1);
         $dest = substr($dest, 0, strlen($dest) - 1);
     }
@@ -628,7 +626,7 @@ function make_clickable($text)
 
         if ($nested_code_pre ||
             empty($piece) ||
-            ($piece[0] === '<' && !preg_match('|^<\s*[\w]{1,20}+://|', $piece))
+            ('<' === $piece[0] && !preg_match('|^<\s*[\w]{1,20}+://|', $piece))
         ) {
             $r .= $piece;
             continue;
@@ -781,19 +779,19 @@ function float_format($number, $flag = 1, $decimalPoint = '.', $thousandsSeparat
 {
     if (is_numeric($number)) {
         if (!$number) {
-            $result = ($flag == 2 ? '0.'.str_repeat('0', EXERCISE_NUMBER_OF_DECIMALS) : '0');
+            $result = (2 == $flag ? '0.'.str_repeat('0', EXERCISE_NUMBER_OF_DECIMALS) : '0');
         } else {
             if (floor($number) == $number) {
                 $result = number_format(
                     $number,
-                    ($flag == 2 ? EXERCISE_NUMBER_OF_DECIMALS : 0),
+                    (2 == $flag ? EXERCISE_NUMBER_OF_DECIMALS : 0),
                     $decimalPoint,
                     $thousandsSeparator
                 );
             } else {
                 $result = number_format(
                     round($number, 2),
-                    ($flag == 0 ? 0 : EXERCISE_NUMBER_OF_DECIMALS),
+                    (0 == $flag ? 0 : EXERCISE_NUMBER_OF_DECIMALS),
                     $decimalPoint,
                     $thousandsSeparator
                 );
@@ -816,7 +814,7 @@ function get_last_week()
     $year = date('Y');
 
     $lastweek = $week - 1;
-    if ($lastweek == 0) {
+    if (0 == $lastweek) {
         $week = 52;
         $year--;
     }
diff --git a/public/main/inc/lib/thematic.lib.php b/public/main/inc/lib/thematic.lib.php
index 8a12a450e5..8ef48c1cfa 100644
--- a/public/main/inc/lib/thematic.lib.php
+++ b/public/main/inc/lib/thematic.lib.php
@@ -8,8 +8,6 @@
  *
  * @author Christian Fasanando <christian1827@gmail.com>
  * @author Julio Montoya <gugli100@gmail.com> SQL fixes
- *
- * @package chamilo.course_progress
  */
 class Thematic
 {
@@ -211,7 +209,7 @@ class Thematic
         $tbl_thematic = Database::get_course_table(TABLE_THEMATIC);
 
         // sort direction
-        if ($direction == 'up') {
+        if ('up' == $direction) {
             $sortorder = 'DESC';
         } else {
             $sortorder = 'ASC';
@@ -630,7 +628,7 @@ class Thematic
             foreach ($thematic_advance_data as $key => $thematic_advance) {
                 $session_star = '';
                 if (api_is_allowed_to_edit(null, true)) {
-                    if ($thematic_advance['session_id'] != 0) {
+                    if (0 != $thematic_advance['session_id']) {
                         $session_star = api_get_session_image(api_get_session_id(), $uinfo['status']);
                     }
                 }
@@ -675,14 +673,14 @@ class Thematic
             if (!empty($default_thematic_plan_title)) {
                 foreach ($default_thematic_plan_title as $id => $title) {
                     //avoid others
-                    if ($title == 'Others' && empty($data[$thematic_id][$id]['description'])) {
+                    if ('Others' == $title && empty($data[$thematic_id][$id]['description'])) {
                         continue;
                     }
                     if (!empty($data[$thematic_id][$id]['title']) &&
                         !empty($data[$thematic_id][$id]['description'])
                     ) {
                         if (api_is_allowed_to_edit(null, true)) {
-                            if ($data[$thematic_id][$id]['session_id'] != 0) {
+                            if (0 != $data[$thematic_id][$id]['session_id']) {
                                 $session_star = api_get_session_image(api_get_session_id(), $uinfo['status']);
                             }
                         }
@@ -1305,7 +1303,7 @@ class Thematic
             foreach ($thematic_data as $thematic) {
                 if (!empty($thematic_advance_data[$thematic['id']])) {
                     foreach ($thematic_advance_data[$thematic['id']] as $thematic_advance) {
-                        if ($thematic_advance['done_advance'] == 1) {
+                        if (1 == $thematic_advance['done_advance']) {
                             $a_thematic_advance_ids[] = $thematic_advance['id'];
                         }
                     }
@@ -1337,7 +1335,7 @@ class Thematic
             foreach ($thematic_data as $thematic) {
                 if (!empty($thematic_advance_data[$thematic['id']])) {
                     foreach ($thematic_advance_data[$thematic['id']] as $thematic_advance) {
-                        if ($thematic_advance['done_advance'] == 0) {
+                        if (0 == $thematic_advance['done_advance']) {
                             $a_thematic_advance_ids[] = $thematic_advance['id'];
                         }
                     }
@@ -1420,7 +1418,7 @@ class Thematic
             $advances = [];
             $count_done_advances = 0;
             foreach ($thematic_advance_data as $thematic_advance) {
-                if ($thematic_advance['done_advance'] == 1) {
+                if (1 == $thematic_advance['done_advance']) {
                     $count_done_advances++;
                 }
                 $advances[] = $thematic_advance['done_advance'];
diff --git a/public/main/inc/lib/timeline.lib.php b/public/main/inc/lib/timeline.lib.php
index 2fc3546206..13ac6e4723 100644
--- a/public/main/inc/lib/timeline.lib.php
+++ b/public/main/inc/lib/timeline.lib.php
@@ -113,7 +113,7 @@ class Timeline extends Model
         $form = new FormValidator('timeline', 'post', $url);
         // Setting the form elements
         $header = get_lang('Add');
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $header = get_lang('Edit');
         }
         $form->addElement('header', $header);
@@ -123,11 +123,11 @@ class Timeline extends Model
         $form->addElement('text', 'headline', get_lang('Name'), ['size' => '70']);
         $status_list = $this->get_status_list();
         $form->addElement('select', 'status', get_lang('Status'), $status_list);
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             //$form->addElement('text', 'created_at', get_lang('Created at'));
             //$form->freeze('created_at');
         }
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $form->addButtonSave(get_lang('Edit'), 'submit');
         } else {
             $form->addButtonCreate(get_lang('Add'), 'submit');
@@ -163,7 +163,7 @@ class Timeline extends Model
         $form = new FormValidator('item_form', 'post', $url);
         // Setting the form elements
         $header = get_lang('Add');
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             $header = get_lang('Edit');
         }
         $form->addElement('header', $header);
@@ -185,7 +185,7 @@ class Timeline extends Model
         $form->addRule('headline', get_lang('Required field'), 'required');
         $form->addRule('start_date', get_lang('Required field'), 'required');
 
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             // Setting the defaults
             $defaults = $this->get($id);
             $form->addButtonSave(get_lang('Edit'), 'submit');
diff --git a/public/main/inc/lib/tracking.lib.php b/public/main/inc/lib/tracking.lib.php
index a4e14c368c..b35424d07d 100644
--- a/public/main/inc/lib/tracking.lib.php
+++ b/public/main/inc/lib/tracking.lib.php
@@ -15,8 +15,6 @@ use ExtraField as ExtraFieldModel;
  *  Class Tracking.
  *
  *  @author  Julio Montoya <gugli100@gmail.com>
- *
- *  @package chamilo.library
  */
 class Tracking
 {
@@ -53,7 +51,7 @@ class Tracking
             return null;
         }
         $courseInfo = api_get_course_info_by_id($course_id);
-        if ($type == 'count') {
+        if ('count' == $type) {
             return GroupManager::get_group_list(null, $courseInfo, null, $sessionId, true);
         }
 
@@ -168,7 +166,7 @@ class Tracking
             if (empty($result)) {
                 $allowNewTracking = false;
             } else {
-                if (isset($result['value']) && $result['value'] == 1) {
+                if (isset($result['value']) && 1 == $result['value']) {
                     $allowNewTracking = true;
                 }
             }
@@ -220,14 +218,14 @@ class Tracking
 
         $extra .= '<div id="dialog-confirm" title="'.get_lang('ConfirmYourChoice').'">';
         $form = new FormValidator('report', 'post', null, null, ['class' => 'form-vertical']);
-        $form->addCheckBox('add_logo', '' , get_lang('AddRightLogo'), ['id' => 'export_format_csv_label']);
+        $form->addCheckBox('add_logo', '', get_lang('AddRightLogo'), ['id' => 'export_format_csv_label']);
         $extra .= $form->returnForm();
         $extra .= '</div>';
 
         $output .= $extra;
 
         $url_suffix = '&lp_id='.$lp_id;
-        if ($origin === 'tracking') {
+        if ('tracking' === $origin) {
             $url_suffix = '&session_id='.$session_id.'&course='.$courseCode.'&student_id='.$user_id.'&lp_id='.$lp_id.'&origin='.$origin;
         }
 
@@ -245,14 +243,14 @@ class Tracking
             );
         }
 
-        if ($origin != 'tracking') {
+        if ('tracking' != $origin) {
             $output .= '<div class="section-status">';
             $output .= Display::page_header(get_lang('My progress'));
             $output .= '</div>';
         }
 
         $actionColumn = null;
-        if ($type === 'classic') {
+        if ('classic' === $type) {
             $actionColumn = ' <th>'.get_lang('Detail').'</th>';
         }
 
@@ -264,7 +262,7 @@ class Tracking
         $output .= '<table id="lp_tracking" class="table tracking">
             <thead>
             <tr class="table-header">
-                <th width="16">'.($allowExtend == true ? $extend_all_link : '&nbsp;').'</th>
+                <th width="16">'.(true == $allowExtend ? $extend_all_link : '&nbsp;').'</th>
                 <th colspan="4">
                     '.get_lang('Learning object name').'
                 </th>
@@ -317,7 +315,7 @@ class Tracking
                 get_lang('Score'),
             ];
 
-            if ($hideTime === false) {
+            if (false === $hideTime) {
                 $csvHeaders[] = get_lang('Time');
             }
 
@@ -398,7 +396,7 @@ class Tracking
                 if (($extend_this || $extend_all) && $num > 0) {
                     $row = Database::fetch_array($result);
                     $result_disabled_ext_all = false;
-                    if ($row['item_type'] === 'quiz') {
+                    if ('quiz' === $row['item_type']) {
                         // Check results_disabled in quiz table.
                         $my_path = Database::escape_string($row['path']);
                         $sql = "SELECT results_disabled
@@ -410,7 +408,7 @@ class Tracking
                         $row_result_disabled = Database::fetch_row($res_result_disabled);
 
                         if (Database::num_rows($res_result_disabled) > 0 &&
-                            (int) $row_result_disabled[0] === 1
+                            1 === (int) $row_result_disabled[0]
                         ) {
                             $result_disabled_ext_all = true;
                         }
@@ -418,7 +416,7 @@ class Tracking
 
                     // If there are several attempts, and the link to extend has been clicked, show each attempt...
                     $oddclass = 'row_even';
-                    if (($counter % 2) === 0) {
+                    if (0 === ($counter % 2)) {
                         $oddclass = 'row_odd';
                     }
                     $extend_link = '';
@@ -445,7 +443,7 @@ class Tracking
                     $counter++;
 
                     $action = null;
-                    if ($type === 'classic') {
+                    if ('classic' === $type) {
                         $action = '<td></td>';
                     }
 
@@ -526,7 +524,7 @@ class Tracking
                         }
 
                         $oddclass = 'row_even';
-                        if (($counter % 2) == 0) {
+                        if (0 == ($counter % 2)) {
                             $oddclass = 'row_odd';
                         }
 
@@ -551,13 +549,13 @@ class Tracking
 
                         $time = learnpathItem::getScormTimeFromParameter('js', $attemptTime);
 
-                        if ($score == 0) {
+                        if (0 == $score) {
                             $maxscore = $row['mymaxscore'];
                         } else {
-                            if ($row['item_type'] === 'sco') {
+                            if ('sco' === $row['item_type']) {
                                 if (!empty($row['myviewmaxscore']) && $row['myviewmaxscore'] > 0) {
                                     $maxscore = $row['myviewmaxscore'];
-                                } elseif ($row['myviewmaxscore'] === '') {
+                                } elseif ('' === $row['myviewmaxscore']) {
                                     $maxscore = 0;
                                 } else {
                                     $maxscore = $row['mymaxscore'];
@@ -570,7 +568,7 @@ class Tracking
                         // Remove "NaN" if any (@todo: locate the source of these NaN)
                         $time = str_replace('NaN', '00'.$h.'00\'00"', $time);
 
-                        if ($row['item_type'] !== 'dir') {
+                        if ('dir' !== $row['item_type']) {
                             if (!$is_allowed_to_edit && $result_disabled_ext_all) {
                                 $view_score = Display::return_icon(
                                     'invisible.png',
@@ -579,7 +577,7 @@ class Tracking
                             } else {
                                 switch ($row['item_type']) {
                                     case 'sco':
-                                        if ($maxscore == 0) {
+                                        if (0 == $maxscore) {
                                             $view_score = $score;
                                         } else {
                                             $view_score = ExerciseLib::show_score(
@@ -590,7 +588,7 @@ class Tracking
                                         }
                                         break;
                                     case 'document':
-                                        $view_score = ($score == 0 ? '/' : ExerciseLib::show_score($score, $maxscore, false));
+                                        $view_score = (0 == $score ? '/' : ExerciseLib::show_score($score, $maxscore, false));
                                         break;
                                     default:
                                         $view_score = ExerciseLib::show_score(
@@ -603,7 +601,7 @@ class Tracking
                             }
 
                             $action = null;
-                            if ($type == 'classic') {
+                            if ('classic' == $type) {
                                 $action = '<td></td>';
                             }
                             $timeRow = '<td class="lp_time" colspan="2">'.$time.'</td>';
@@ -627,17 +625,17 @@ class Tracking
                                     learnpathItem::humanize_status($lesson_status, false, $type)
                                 );
 
-                                if ($row['item_type'] === 'quiz') {
+                                if ('quiz' === $row['item_type']) {
                                     if (!$is_allowed_to_edit && $result_disabled_ext_all) {
                                         $temp[] = '/';
                                     } else {
-                                        $temp[] = ($score == 0 ? '0/'.$maxscore : ($maxscore == 0 ? $score : $score.'/'.float_format($maxscore, 1)));
+                                        $temp[] = (0 == $score ? '0/'.$maxscore : (0 == $maxscore ? $score : $score.'/'.float_format($maxscore, 1)));
                                     }
                                 } else {
-                                    $temp[] = ($score == 0 ? '/' : ($maxscore == 0 ? $score : $score.'/'.float_format($maxscore, 1)));
+                                    $temp[] = (0 == $score ? '/' : (0 == $maxscore ? $score : $score.'/'.float_format($maxscore, 1)));
                                 }
 
-                                if ($hideTime === false) {
+                                if (false === $hideTime) {
                                     $temp[] = $time;
                                 }
                                 $csv_content[] = $temp;
@@ -646,7 +644,7 @@ class Tracking
 
                         $counter++;
                         $action = null;
-                        if ($type === 'classic') {
+                        if ('classic' === $type) {
                             $action = '<td></td>';
                         }
 
@@ -654,7 +652,7 @@ class Tracking
                             $list1 = learnpath::get_iv_interactions_array($row['iv_id'], $course_id);
                             foreach ($list1 as $id => $interaction) {
                                 $oddclass = 'row_even';
-                                if (($counter % 2) == 0) {
+                                if (0 == ($counter % 2)) {
                                     $oddclass = 'row_odd';
                                 }
                                 $timeRow = '<td class="lp_time">'.$interaction['time'].'</td>';
@@ -682,7 +680,7 @@ class Tracking
                             $list2 = learnpath::get_iv_objectives_array($row['iv_id'], $course_id);
                             foreach ($list2 as $id => $interaction) {
                                 $oddclass = 'row_even';
-                                if (($counter % 2) === 0) {
+                                if (0 === ($counter % 2)) {
                                     $oddclass = 'row_odd';
                                 }
                                 $output .= '<tr class="'.$oddclass.'">
@@ -709,7 +707,7 @@ class Tracking
                     $my_lp_view_id = $row['mylpviewid'];
                     $my_path = $row['path'];
                     $result_disabled_ext_all = false;
-                    if ($row['item_type'] === 'quiz') {
+                    if ('quiz' === $row['item_type']) {
                         // Check results_disabled in quiz table.
                         $my_path = Database::escape_string($my_path);
                         $sql = "SELECT results_disabled
@@ -719,7 +717,7 @@ class Tracking
                         $row_result_disabled = Database::fetch_row($res_result_disabled);
 
                         if (Database::num_rows($res_result_disabled) > 0 &&
-                            (int) $row_result_disabled[0] === 1
+                            1 === (int) $row_result_disabled[0]
                         ) {
                             $result_disabled_ext_all = true;
                         }
@@ -749,7 +747,7 @@ class Tracking
                     }
 
                     $oddclass = 'row_even';
-                    if (($counter % 2) == 0) {
+                    if (0 == ($counter % 2)) {
                         $oddclass = 'row_odd';
                     }
 
@@ -799,7 +797,7 @@ class Tracking
                         case 'sco':
                             if (!empty($row['myviewmaxscore']) && $row['myviewmaxscore'] > 0) {
                                 $maxscore = $row['myviewmaxscore'];
-                            } elseif ($row['myviewmaxscore'] === '') {
+                            } elseif ('' === $row['myviewmaxscore']) {
                                 $maxscore = 0;
                             } else {
                                 $maxscore = $row['mymaxscore'];
@@ -894,7 +892,7 @@ class Tracking
                     }
 
                     $action = null;
-                    if ($type == 'classic') {
+                    if ('classic' == $type) {
                         $action = '<td></td>';
                     }
 
@@ -913,7 +911,7 @@ class Tracking
                     } else {
                         $correct_test_link = '-';
                         $showRowspan = false;
-                        if ($row['item_type'] === 'quiz') {
+                        if ('quiz' === $row['item_type']) {
                             $my_url_suffix = '&course='.$courseCode.'&student_id='.$user_id.'&lp_id='.intval($row['mylpid']).'&origin='.$origin;
                             $sql = 'SELECT * FROM '.$tbl_stats_exercices.'
                                      WHERE
@@ -931,7 +929,7 @@ class Tracking
                             $showRowspan = false;
                             if ($num > 0) {
                                 $linkId = 'link_'.$my_id;
-                                if ($extendedAttempt == 1 &&
+                                if (1 == $extendedAttempt &&
                                     $lp_id == $my_lp_id &&
                                     $lp_item_id == $my_id
                                 ) {
@@ -961,7 +959,7 @@ class Tracking
 
                         $title = Security::remove_XSS($title);
                         $action = null;
-                        if ($type === 'classic') {
+                        if ('classic' === $type) {
                             $action = '<td '.($showRowspan ? 'rowspan="2"' : '').'>'.$correct_test_link.'</td>';
                         }
 
@@ -983,7 +981,7 @@ class Tracking
                             }
 
                             $scoreItem = null;
-                            if ($row['item_type'] == 'quiz') {
+                            if ('quiz' == $row['item_type']) {
                                 if (!$is_allowed_to_edit && $result_disabled_ext_all) {
                                     $scoreItem .= Display::return_icon(
                                         'invisible.png',
@@ -993,7 +991,7 @@ class Tracking
                                     $scoreItem .= ExerciseLib::show_score($score, $maxscore, false);
                                 }
                             } else {
-                                $scoreItem .= $score == 0 ? '/' : ($maxscore == 0 ? $score : $score.'/'.$maxscore);
+                                $scoreItem .= 0 == $score ? '/' : (0 == $maxscore ? $score : $score.'/'.$maxscore);
                             }
 
                             $timeRow = '<td class="lp_time" colspan="2">'.$time.'</td>';
@@ -1016,17 +1014,17 @@ class Tracking
                             $temp = [];
                             $temp[] = api_html_entity_decode($title, ENT_QUOTES);
                             $temp[] = api_html_entity_decode($lesson_status, ENT_QUOTES);
-                            if ($row['item_type'] === 'quiz') {
+                            if ('quiz' === $row['item_type']) {
                                 if (!$is_allowed_to_edit && $result_disabled_ext_all) {
                                     $temp[] = '/';
                                 } else {
-                                    $temp[] = ($score == 0 ? '0/'.$maxscore : ($maxscore == 0 ? $score : $score.'/'.float_format($maxscore, 1)));
+                                    $temp[] = (0 == $score ? '0/'.$maxscore : (0 == $maxscore ? $score : $score.'/'.float_format($maxscore, 1)));
                                 }
                             } else {
-                                $temp[] = ($score == 0 ? '/' : ($maxscore == 0 ? $score : $score.'/'.float_format($maxscore, 1)));
+                                $temp[] = (0 == $score ? '/' : (0 == $maxscore ? $score : $score.'/'.float_format($maxscore, 1)));
                             }
 
-                            if ($hideTime === false) {
+                            if (false === $hideTime) {
                                 $temp[] = $time;
                             }
                             $csv_content[] = $temp;
@@ -1035,14 +1033,14 @@ class Tracking
 
                     $counter++;
                     $action = null;
-                    if ($type === 'classic') {
+                    if ('classic' === $type) {
                         $action = '<td></td>';
                     }
 
                     if ($extend_this_attempt || $extend_all) {
                         $list1 = learnpath::get_iv_interactions_array($row['iv_id'], $course_id);
                         foreach ($list1 as $id => $interaction) {
-                            if (($counter % 2) == 0) {
+                            if (0 == ($counter % 2)) {
                                 $oddclass = 'row_odd';
                             } else {
                                 $oddclass = 'row_even';
@@ -1071,7 +1069,7 @@ class Tracking
                         $list2 = learnpath::get_iv_objectives_array($row['iv_id'], $course_id);
 
                         foreach ($list2 as $id => $interaction) {
-                            if (($counter % 2) == 0) {
+                            if (0 == ($counter % 2)) {
                                 $oddclass = 'row_odd';
                             } else {
                                 $oddclass = 'row_even';
@@ -1097,7 +1095,7 @@ class Tracking
                         // Get attempts of a exercise.
                         if (!empty($lp_id) &&
                             !empty($lp_item_id) &&
-                            $row['item_type'] === 'quiz'
+                            'quiz' === $row['item_type']
                         ) {
                             $sql = "SELECT path FROM $TBL_LP_ITEM
                                     WHERE
@@ -1141,14 +1139,14 @@ class Tracking
                                             );
                                         } else {
                                             // Show only float when need it
-                                            if ($my_score == 0) {
+                                            if (0 == $my_score) {
                                                 $view_score = ExerciseLib::show_score(
                                                     0,
                                                     $my_maxscore,
                                                     false
                                                 );
                                             } else {
-                                                if ($my_maxscore == 0) {
+                                                if (0 == $my_maxscore) {
                                                     $view_score = $my_score;
                                                 } else {
                                                     $view_score = ExerciseLib::show_score(
@@ -1160,9 +1158,9 @@ class Tracking
                                             }
                                         }
                                         $my_lesson_status = $row_attempts['status'];
-                                        if ($my_lesson_status == '') {
+                                        if ('' == $my_lesson_status) {
                                             $my_lesson_status = learnpathitem::humanize_status('completed');
-                                        } elseif ($my_lesson_status == 'incomplete') {
+                                        } elseif ('incomplete' == $my_lesson_status) {
                                             $my_lesson_status = learnpathitem::humanize_status('incomplete');
                                         }
                                         $timeRow = '<td class="lp_time" colspan="2">'.$time_attemp.'</td>';
@@ -1178,8 +1176,8 @@ class Tracking
                                         <td colspan="2">'.$view_score.'</td>
                                         '.$timeRow;
 
-                                        if ($action == 'classic') {
-                                            if ($origin != 'tracking') {
+                                        if ('classic' == $action) {
+                                            if ('tracking' != $origin) {
                                                 if (!$is_allowed_to_edit && $result_disabled_ext_all) {
                                                     $output .= '<td>
                                                             <img src="'.Display::returnIconPath('quiz_na.gif').'" alt="'.get_lang('Show attempt').'" title="'.get_lang('Show attempt').'">
@@ -1272,12 +1270,12 @@ class Tracking
         $progress = learnpath::getProgress($lp_id, $user_id, $course_id, $session_id);
 
         $oddclass = 'row_even';
-        if (($counter % 2) == 0) {
+        if (0 == ($counter % 2)) {
             $oddclass = 'row_odd';
         }
 
         $action = null;
-        if ($type === 'classic') {
+        if ('classic' === $type) {
             $action = '<td></td>';
         }
 
@@ -1317,7 +1315,7 @@ class Tracking
                 $finalScoreToCsv,
             ];
 
-            if ($hideTime === false) {
+            if (false === $hideTime) {
                 $temp[] = $total_time;
             }
 
@@ -1770,14 +1768,14 @@ class Tracking
             $extraFieldValue = new ExtraFieldValue('session');
             $value = $extraFieldValue->get_values_by_handler_and_field_variable($sessionId, 'new_tracking_system');
 
-            if ($value && isset($value['value']) && $value['value'] == 1) {
+            if ($value && isset($value['value']) && 1 == $value['value']) {
                 return true;
             }
         } else {
             if ($courseId) {
                 $extraFieldValue = new ExtraFieldValue('course');
                 $value = $extraFieldValue->get_values_by_handler_and_field_variable($courseId, 'new_tracking_system');
-                if ($value && isset($value['value']) && $value['value'] == 1) {
+                if ($value && isset($value['value']) && 1 == $value['value']) {
                     return true;
                 }
             }
@@ -1830,7 +1828,7 @@ class Tracking
                     UNIX_TIMESTAMP(logout_course_date) > UNIX_TIMESTAMP(login_course_date) AND
                     c_id = '$courseId' ";
 
-        if ($session_id != -1) {
+        if (-1 != $session_id) {
             $sql .= "AND session_id = '$session_id' ";
         }
 
@@ -2002,7 +2000,7 @@ class Tracking
             // Show the last date on which the user acceed the session when it was active
             $where_condition = '';
             $userInfo = api_get_user_info($student_id);
-            if ($userInfo['status'] == STUDENT && !empty($session_id)) {
+            if (STUDENT == $userInfo['status'] && !empty($session_id)) {
                 // fin de acceso a la sesión
                 $sessionInfo = SessionManager::fetch($session_id);
                 $last_access = $sessionInfo['access_end_date'];
@@ -2126,7 +2124,7 @@ class Tracking
         // with 14M rows). As such, we'll try to use APCu if it is
         // available to store the resulting value for a few seconds
         $cacheAvailable = api_get_configuration_value('apc');
-        if ($cacheAvailable === true) {
+        if (true === $cacheAvailable) {
             $apc = apcu_cache_info(true);
             $apc_end = $apc['start_time'] + $apc['ttl'];
             $apc_var = api_get_configuration_value('apc_prefix').'course_access_'.$courseId.'_'.$session_id.'_'.strtotime($roundedStart).'_'.strtotime($roundedStop);
@@ -2233,16 +2231,16 @@ class Tracking
                 $session_id = intval($session_id);
                 $condition_session = " AND session_id = $session_id ";
             }
-            if ($active_filter == 1) {
+            if (1 == $active_filter) {
                 $condition_active = 'AND active <> -1';
-            } elseif ($active_filter == 0) {
+            } elseif (0 == $active_filter) {
                 $condition_active = 'AND active <> 0';
             } else {
                 $condition_active = '';
             }
             $condition_into_lp = '';
             $select_lp_id = '';
-            if ($into_lp == 0) {
+            if (0 == $into_lp) {
                 $condition_into_lp = 'AND orig_lp_id = 0 AND orig_lp_item_id = 0';
             } else {
                 $select_lp_id = ', orig_lp_id as lp_id ';
@@ -2311,7 +2309,7 @@ class Tracking
                 if (is_array($student_id)) {
                     $quiz_avg_score = round($quiz_avg_score / count($student_id), 2);
                 }
-                if ($into_lp == 0) {
+                if (0 == $into_lp) {
                     return $quiz_avg_score;
                 } else {
                     if (!empty($row['lp_id'])) {
@@ -2390,10 +2388,10 @@ class Tracking
                     exe_user_id= $student_id AND
                     session_id = $session_id ";
 
-        if ($find_all_lp == 1) {
+        if (1 == $find_all_lp) {
             $sql .= "AND (orig_lp_id = $lp_id OR orig_lp_id = 0)
                 AND (orig_lp_item_id = $lp_item_id OR orig_lp_item_id = 0)";
-        } elseif ($find_all_lp == 0) {
+        } elseif (0 == $find_all_lp) {
             $sql .= "AND orig_lp_id = $lp_id
                 AND orig_lp_item_id = $lp_item_id";
         }
@@ -2448,7 +2446,7 @@ class Tracking
             $row = Database::fetch_row($rs);
             $count = $row[0];
         }
-        $count = ($count != 0) ? 100 * round(intval($count) / count($exercise_list), 2).'%' : '0%';
+        $count = (0 != $count) ? 100 * round(intval($count) / count($exercise_list), 2).'%' : '0%';
 
         return $count;
     }
@@ -2864,12 +2862,12 @@ class Tracking
                         echo '<h3>Item Type: '.$row_max_score['item_type'].'</h3>';
                     }
 
-                    if ($row_max_score['item_type'] == 'sco') {
+                    if ('sco' == $row_max_score['item_type']) {
                         /* Check if it is sco (easier to get max_score)
                            when there's no max score, we assume 100 as the max score,
                            as the SCORM 1.2 says that the value should always be between 0 and 100.
                         */
-                        if ($max_score == 0 || is_null($max_score) || $max_score == '') {
+                        if (0 == $max_score || is_null($max_score) || '' == $max_score) {
                             // Chamilo style
                             if ($use_max_score[$lp_id]) {
                                 $max_score = 100;
@@ -2925,7 +2923,7 @@ class Tracking
                             $attemptResult = Database::fetch_array($result_last_attempt, 'ASSOC');
                             $id_last_attempt = $attemptResult['exe_id'];
                             // We overwrite the score with the best one not the one saved in the LP (latest)
-                            if ($getOnlyBestAttempt && $get_only_latest_attempt_results == false) {
+                            if ($getOnlyBestAttempt && false == $get_only_latest_attempt_results) {
                                 if ($debug) {
                                     echo "Following score comes from the track_exercise table not in the LP because the score is the best<br />";
                                 }
@@ -2975,7 +2973,7 @@ class Tracking
                         if ($use_max_score[$lp_id]) {
                             $count_items++;
                         } else {
-                            if ($max_score != '') {
+                            if ('' != $max_score) {
                                 $count_items++;
                             }
                         }
@@ -3008,7 +3006,7 @@ class Tracking
             $result_have_quiz = Database::query($sql);
             if (Database::num_rows($result_have_quiz) > 0) {
                 $row = Database::fetch_array($result_have_quiz, 'ASSOC');
-                if (is_numeric($row['count']) && $row['count'] != 0) {
+                if (is_numeric($row['count']) && 0 != $row['count']) {
                     $lp_with_quiz++;
                 }
             }
@@ -3021,7 +3019,7 @@ class Tracking
             echo '<h3>Final return</h3>';
         }
 
-        if ($lp_with_quiz != 0) {
+        if (0 != $lp_with_quiz) {
             if (!$return_array) {
                 $score_of_scorm_calculate = round(($global_result / $lp_with_quiz), 2);
                 if ($debug) {
@@ -3363,7 +3361,7 @@ class Tracking
         if (api_is_multiple_url_enabled()) {
             $tbl_session_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql = 'SELECT scu.session_id, scu.c_id
                         FROM '.$tbl_session_course_user.' scu
                         INNER JOIN '.$tbl_session_rel_access_url.'  sru
@@ -3410,7 +3408,7 @@ class Tracking
         if (api_is_multiple_url_enabled()) {
             $tbl_session_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql = 'SELECT session_course_user.user_id
                         FROM '.$tbl_session_course_user.' as session_course_user
                         INNER JOIN '.$tbl_session_user.' sru
@@ -3508,7 +3506,7 @@ class Tracking
 
         if (api_is_multiple_url_enabled()) {
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql = 'SELECT DISTINCT c.code
                         FROM '.$tbl_session_course_user.' scu
                         INNER JOIN '.$tbl_course.' c
@@ -3544,7 +3542,7 @@ class Tracking
         if (api_is_multiple_url_enabled()) {
             $tbl_course_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql = 'SELECT DISTINCT c.code
                     FROM '.$tbl_session_course.' as session_course
                     INNER JOIN '.$tbl_course.' c
@@ -3701,7 +3699,7 @@ class Tracking
 
         $sessions = [];
         while ($row = Database::fetch_array($rs)) {
-            if ($row['access_start_date'] === '0000-00-00 00:00:00') {
+            if ('0000-00-00 00:00:00' === $row['access_start_date']) {
                 $row['access_start_date'] = null;
             }
 
@@ -4334,7 +4332,7 @@ class Tracking
             return false;
         }
 
-        if ($since === 'never') {
+        if ('never' === $since) {
             if (empty($session_id)) {
                 $sql = 'SELECT course_user.user_id
                         FROM '.$table_course_rel_user.' course_user
@@ -4722,7 +4720,7 @@ class Tracking
                 $html .= '<thead><tr>';
                 foreach ($columns as $columnKey => $name) {
                     if (!empty($availableColumns)) {
-                        if (isset($availableColumns[$columnKey]) && $availableColumns[$columnKey] == false) {
+                        if (isset($availableColumns[$columnKey]) && false == $availableColumns[$columnKey]) {
                             continue;
                         }
                     }
@@ -4847,7 +4845,7 @@ class Tracking
 
                     foreach ($result as $columnKey => $data) {
                         if (!empty($availableColumns)) {
-                            if (isset($availableColumns[$columnKey]) && $availableColumns[$columnKey] == false) {
+                            if (isset($availableColumns[$columnKey]) && false == $availableColumns[$columnKey]) {
                                 continue;
                             }
                         }
@@ -4890,7 +4888,7 @@ class Tracking
                         $exercise_obj->read($exercise_data['id']);
                         // Exercise is not necessary to be visible to show results check the result_disable configuration instead
                         //$visible_return = $exercise_obj->is_visible();
-                        if ($exercise_data['results_disabled'] == 0 || $exercise_data['results_disabled'] == 2) {
+                        if (0 == $exercise_data['results_disabled'] || 2 == $exercise_data['results_disabled']) {
                             $best_average = (int)
                                 ExerciseLib::get_best_average_score_by_exercise(
                                     $exercise_data['id'],
@@ -4911,7 +4909,7 @@ class Tracking
                             );
 
                             $score = 0;
-                            if (!empty($user_result_data['max_score']) && intval($user_result_data['max_score']) != 0) {
+                            if (!empty($user_result_data['max_score']) && 0 != intval($user_result_data['max_score'])) {
                                 $score = intval($user_result_data['score'] / $user_result_data['max_score'] * 100);
                             }
                             $time = api_strtotime($exercise_data['start_time']) ? api_strtotime($exercise_data['start_time'], 'UTC') : 0;
@@ -4986,7 +4984,7 @@ class Tracking
             foreach ($course_in_session as $my_session_id => $session_data) {
                 $course_list = $session_data['course_list'];
                 $session_name = $session_data['name'];
-                if ($showAllSessions == false) {
+                if (false == $showAllSessions) {
                     if (isset($session_id) && !empty($session_id)) {
                         if ($session_id != $my_session_id) {
                             continue;
@@ -5301,7 +5299,7 @@ class Tracking
                         'published_exercises' => $stats_array[$course_code]['exercises'], // exercise available
                         'new_exercises' => $stats_array[$course_code]['unanswered_exercises_by_user'],
                         'my_average' => ExerciseLib::convert_to_percentage($stats_array[$course_code]['my_average']),
-                        'average_exercise_result' => $stats_array[$course_code]['average'] == 0 ? '-' : '('.ExerciseLib::convert_to_percentage($stats_array[$course_code]['average']).')',
+                        'average_exercise_result' => 0 == $stats_array[$course_code]['average'] ? '-' : '('.ExerciseLib::convert_to_percentage($stats_array[$course_code]['average']).')',
                         'time_spent' => $time,
                         'lp_progress' => $progress,
                         'score' => $percentage_score,
@@ -5323,7 +5321,7 @@ class Tracking
             }
         }
 
-        $pluginCalendar = api_get_plugin_setting('learning_calendar', 'enabled') === 'true';
+        $pluginCalendar = 'true' === api_get_plugin_setting('learning_calendar', 'enabled');
         if ($pluginCalendar) {
             $course_in_session[0] = $courseIdList;
             $plugin = LearningCalendarPlugin::create();
@@ -5421,20 +5419,20 @@ class Tracking
                     $html .= '<tr class="row_even">';
                     $url = api_get_path(WEB_CODE_PATH)."exercise/overview.php?cidReq={$course_info['code']}&id_session=$session_id&exerciseId={$exercices['id']}";
 
-                    if ($visible_return['value'] == true) {
+                    if (true == $visible_return['value']) {
                         $exercices['title'] = Display::url(
                             $exercices['title'],
                             $url,
                             ['target' => SESSION_LINK_TARGET]
                         );
-                    } elseif ($exercices['active'] == -1) {
+                    } elseif (-1 == $exercices['active']) {
                         $exercices['title'] = sprintf(get_lang('%s (deleted)'), $exercices['title']);
                     }
 
                     $html .= Display::tag('td', $exercices['title']);
 
                     // Exercise configuration show results or show only score
-                    if ($exercices['results_disabled'] == 0 || $exercices['results_disabled'] == 2) {
+                    if (0 == $exercices['results_disabled'] || 2 == $exercices['results_disabled']) {
                         //For graphics
                         $best_exercise_stats = Event::get_best_exercise_results_by_user(
                             $exercices['id'],
@@ -5485,7 +5483,7 @@ class Tracking
                                     $latest_attempt_url
                                 );
                                 $my_score = 0;
-                                if (!empty($weighting) && intval($weighting) != 0) {
+                                if (!empty($weighting) && 0 != intval($weighting)) {
                                     $my_score = $score / $weighting;
                                 }
                                 //@todo this function slows the page
@@ -5565,7 +5563,7 @@ class Tracking
             if (isset($trackingColumns['my_progress_lp'])) {
                 foreach ($columnHeaders as $key => $value) {
                     if (!isset($trackingColumns['my_progress_lp'][$key]) ||
-                        $trackingColumns['my_progress_lp'][$key] == false
+                        false == $trackingColumns['my_progress_lp'][$key]
                     ) {
                         unset($columnHeaders[$key]);
                     }
@@ -5669,7 +5667,7 @@ class Tracking
                     $html .= '<tr class="row_even">';
 
                     if (in_array('lp', $columnHeadersKeys)) {
-                        if ($learnpath['lp_visibility'] == 0) {
+                        if (0 == $learnpath['lp_visibility']) {
                             $html .= Display::tag('td', $learnpath['lp_name']);
                         } else {
                             $html .= Display::tag(
@@ -5802,11 +5800,11 @@ class Tracking
 
         foreach ($attempts as $attempt) {
             if (api_get_user_id() == $attempt['exe_user_id']) {
-                if ($attempt['max_score'] != 0) {
+                if (0 != $attempt['max_score']) {
                     $my_exercise_result_array[] = $attempt['score'] / $attempt['max_score'];
                 }
             } else {
-                if ($attempt['max_score'] != 0) {
+                if (0 != $attempt['max_score']) {
                     $exercise_result[] = $attempt['score'] / $attempt['max_score'];
                 }
             }
@@ -5828,7 +5826,7 @@ class Tracking
 
         for ($i = 1; $i <= $pieces; $i++) {
             $sum = 1;
-            if ($i == 1) {
+            if (1 == $i) {
                 $sum = 0;
             }
             $min = ($i - 1) * $part + $sum;
@@ -5990,11 +5988,11 @@ class Tracking
         }
         foreach ($attempts as $attempt) {
             if (api_get_user_id() == $attempt['exe_user_id']) {
-                if ($attempt['max_score'] != 0) {
+                if (0 != $attempt['max_score']) {
                     $my_exercise_result_array[] = $attempt['score'] / $attempt['max_score'];
                 }
             } else {
-                if ($attempt['max_score'] != 0) {
+                if (0 != $attempt['max_score']) {
                     $exercise_result[] = $attempt['score'] / $attempt['max_score'];
                 }
             }
@@ -6016,7 +6014,7 @@ class Tracking
 
         for ($i = 1; $i <= $pieces; $i++) {
             $sum = 1;
-            if ($i == 1) {
+            if (1 == $i) {
                 $sum = 0;
             }
             $min = ($i - 1) * $part + $sum;
@@ -6409,7 +6407,7 @@ class Tracking
                 $data[$id]['lastname'] = $users[$row['user_id']]['lastname'];
                 $data[$id]['username'] = $users[$row['user_id']]['username'];
                 $data[$id]['answer'] = $answer[$rowQuestId][$rowAnsId]['answer'];
-                $data[$id]['correct'] = ($answer[$rowQuestId][$rowAnsId]['correct'] == 0 ? get_lang('No') : get_lang('Yes'));
+                $data[$id]['correct'] = (0 == $answer[$rowQuestId][$rowAnsId]['correct'] ? get_lang('No') : get_lang('Yes'));
                 $data[$id]['question'] = $question[$rowQuestId]['question'];
                 $data[$id]['question_id'] = $rowQuestId;
                 $data[$id]['description'] = $row['description'];
@@ -6485,7 +6483,7 @@ class Tracking
      */
     public static function displayUserSkills($userId, $courseId = 0, $sessionId = 0, $forceView = false)
     {
-        if (Skill::isAllowed($userId, false) === false && $forceView == false) {
+        if (false === Skill::isAllowed($userId, false) && false == $forceView) {
             return '';
         }
         $skillManager = new Skill();
@@ -6622,7 +6620,7 @@ class Tracking
                             if (!isset($lpTime[$item['action_details']])) {
                                 $lpTime[$item['action_details']] = 0;
                             }
-                            if ($beforeItem['action'] === 'learnpath_id') {
+                            if ('learnpath_id' === $beforeItem['action']) {
                                 $lpTime[$item['action_details']] += $partialTime;
                             } else {
                                 $quizTime += $partialTime;
@@ -6685,7 +6683,7 @@ class Tracking
                    ORDER BY login_date DESC LIMIT 1";
         $ip = '';
         $res_ip = Database::query($sql_ip);
-        if ($res_ip !== false && Database::num_rows($res_ip) > 0) {
+        if (false !== $res_ip && Database::num_rows($res_ip) > 0) {
             $row_ip = Database::fetch_row($res_ip);
             if ($return_as_link) {
                 $ip = Display::url(
@@ -6813,8 +6811,6 @@ class Tracking
 
 /**
  * @todo move into a proper file
- *
- * @package chamilo.tracking
  */
 class TrackingCourseLog
 {
@@ -6917,11 +6913,11 @@ class TrackingCourseLog
                     'thematic_plan'
                 )";
 
-        if ($column == 0) {
+        if (0 == $column) {
             $column = '0';
         }
-        if ($column != '' && $direction != '') {
-            if ($column != 2 && $column != 4) {
+        if ('' != $column && '' != $direction) {
+            if (2 != $column && 4 != $column) {
                 $sql .= " ORDER BY col$column $direction";
             }
         } else {
@@ -6986,7 +6982,7 @@ class TrackingCourseLog
 
                 $url_tool = api_get_path(WEB_CODE_PATH).$table_name['link_tool'];
                 $row[0] = '';
-                if ($row['col6'] != 2) {
+                if (2 != $row['col6']) {
                     if (in_array($row['col0'], $thematic_tools)) {
                         $exp_thematic_tool = explode('_', $row['col0']);
                         $thematic_tool_title = '';
@@ -7212,7 +7208,7 @@ class TrackingCourseLog
         $extra_fields_to_show = 0;
         foreach ($extra_fields as $key => $field) {
             // show only extra fields that are visible + and can be filtered, added by J.Montoya
-            if ($field[6] == 1 && $field[8] == 1) {
+            if (1 == $field[6] && 1 == $field[8]) {
                 if (isset($_GET['additional_profile_field']) && $field[0] == $_GET['additional_profile_field']) {
                     $selected = 'selected="selected"';
                 } else {
@@ -7226,7 +7222,7 @@ class TrackingCourseLog
 
         // the form elements for the $_GET parameters (because the form is passed through GET
         foreach ($_GET as $key => $value) {
-            if ($key != 'additional_profile_field') {
+            if ('additional_profile_field' != $key) {
                 $return .= '<input type="hidden" name="'.Security::remove_XSS($key).'" value="'.Security::remove_XSS($value).'" />';
             }
         }
@@ -7267,7 +7263,7 @@ class TrackingCourseLog
         $result_extra_field = UserManager::get_extra_field_information($field_id);
         $return = [];
         if (!empty($users)) {
-            if ($result_extra_field['field_type'] == UserManager::USER_FIELD_TYPE_TAG) {
+            if (UserManager::USER_FIELD_TYPE_TAG == $result_extra_field['field_type']) {
                 foreach ($users as $user_id) {
                     $user_result = UserManager::get_user_tags($user_id, $field_id);
                     $tag_list = [];
@@ -7299,8 +7295,8 @@ class TrackingCourseLog
                 while ($row = Database::fetch_array($result)) {
                     // get option value for field type double select by id
                     if (!empty($row['value'])) {
-                        if ($result_extra_field['field_type'] ==
-                            ExtraField::FIELD_TYPE_DOUBLE_SELECT
+                        if (ExtraField::FIELD_TYPE_DOUBLE_SELECT ==
+                            $result_extra_field['field_type']
                         ) {
                             $id_double_select = explode(';', $row['value']);
                             if (is_array($id_double_select)) {
@@ -7310,7 +7306,7 @@ class TrackingCourseLog
                             }
                         }
 
-                        if ($result_extra_field['field_type'] == ExtraField::FIELD_TYPE_SELECT_WITH_TEXT_FIELD) {
+                        if (ExtraField::FIELD_TYPE_SELECT_WITH_TEXT_FIELD == $result_extra_field['field_type']) {
                             $parsedValue = explode('::', $row['value']);
 
                             if ($parsedValue) {
@@ -7321,7 +7317,7 @@ class TrackingCourseLog
                             }
                         }
 
-                        if ($result_extra_field['field_type'] == ExtraField::FIELD_TYPE_TRIPLE_SELECT) {
+                        if (ExtraField::FIELD_TYPE_TRIPLE_SELECT == $result_extra_field['field_type']) {
                             list($level1, $level2, $level3) = explode(';', $row['value']);
 
                             $row['value'] = $result_extra_field['options'][$level1]['display_text'].' / ';
@@ -7565,14 +7561,14 @@ class TrackingCourseLog
                 $user['user_id'],
                 $courseId,
                 $session_id,
-                $export_csv === false
+                false === $export_csv
             );
 
             $user['last_connection'] = Tracking::get_last_connection_date_on_the_course(
                 $user['user_id'],
                 $courseInfo,
                 $session_id,
-                $export_csv === false
+                false === $export_csv
             );
 
             if ($export_csv) {
@@ -7775,7 +7771,7 @@ class TrackingCourseLog
                 $user['user_id'],
                 $courseInfo,
                 $session_id,
-                $export_csv === false
+                false === $export_csv
             );
 
             $user['link'] = '<center>
diff --git a/public/main/inc/lib/urlmanager.lib.php b/public/main/inc/lib/urlmanager.lib.php
index 5306ec8d70..57a37caf5a 100644
--- a/public/main/inc/lib/urlmanager.lib.php
+++ b/public/main/inc/lib/urlmanager.lib.php
@@ -5,8 +5,6 @@
  * Class UrlManager
  * This library provides functions for the access_url management.
  * Include/require it in your code to use its functionality.
- *
- * @package chamilo.library
  */
 class UrlManager
 {
@@ -409,13 +407,13 @@ class UrlManager
     public static function set_url_status($status, $urlId)
     {
         $url_table = Database::get_main_table(TABLE_MAIN_ACCESS_URL);
-        if ($status == 'lock') {
+        if ('lock' == $status) {
             $status_db = '0';
         }
-        if ($status == 'unlock') {
+        if ('unlock' == $status) {
             $status_db = '1';
         }
-        if (($status_db == '1' || $status_db == '0') && is_numeric($urlId)) {
+        if (('1' == $status_db || '0' == $status_db) && is_numeric($urlId)) {
             $sql = "UPDATE $url_table SET active='".intval($status_db)."'
                     WHERE id='".intval($urlId)."'";
             Database::query($sql);
@@ -534,7 +532,7 @@ class UrlManager
             foreach ($url_list as $urlId) {
                 foreach ($user_list as $user_id) {
                     $count = self::relation_url_user_exist($user_id, $urlId);
-                    if ($count == 0) {
+                    if (0 == $count) {
                         $sql = "INSERT INTO $table
                                 SET 
                                     user_id = ".intval($user_id).", 
@@ -575,7 +573,7 @@ class UrlManager
                     $courseId = $courseInfo['real_id'];
 
                     $count = self::relation_url_course_exist($courseId, $urlId);
-                    if ($count == 0) {
+                    if (0 == $count) {
                         $sql = "INSERT INTO $table
                                 SET c_id = '".$courseId."', access_url_id = ".intval($urlId);
                         $result = Database::query($sql);
@@ -612,7 +610,7 @@ class UrlManager
                         $userGroupId,
                         $urlId
                     );
-                    if ($count == 0) {
+                    if (0 == $count) {
                         $result = self::addUserGroupToUrl($userGroupId, $urlId);
                         if ($result) {
                             $resultArray[$urlId][$userGroupId] = 1;
@@ -644,7 +642,7 @@ class UrlManager
             foreach ($urlList as $urlId) {
                 foreach ($courseCategoryList as $categoryCourseId) {
                     $count = self::relationUrlCourseCategoryExist($categoryCourseId, $urlId);
-                    if ($count == 0) {
+                    if (0 == $count) {
                         $result = self::addCourseCategoryToUrl($categoryCourseId, $urlId);
                         if ($result) {
                             $resultArray[$urlId][$categoryCourseId] = 1;
@@ -745,7 +743,7 @@ class UrlManager
                 foreach ($session_list as $session_id) {
                     $count = self::relation_url_session_exist($session_id, $urlId);
 
-                    if ($count == 0) {
+                    if (0 == $count) {
                         $sql = "INSERT INTO $table
                                 SET
                                 session_id = ".intval($session_id).",
diff --git a/public/main/inc/lib/usergroup.lib.php b/public/main/inc/lib/usergroup.lib.php
index 8e50610239..8d266e6f80 100644
--- a/public/main/inc/lib/usergroup.lib.php
+++ b/public/main/inc/lib/usergroup.lib.php
@@ -6,8 +6,6 @@
  *
  * This class provides methods for the UserGroup management.
  * Include/require it in your code to use its features.
- *
- * @package chamilo.library
  */
 class UserGroup extends Model
 {
@@ -129,7 +127,7 @@ class UserGroup extends Model
             return 0;
         } else {
             $list = [];
-            $showCalendar = api_get_plugin_setting('learning_calendar', 'enabled') === 'true';
+            $showCalendar = 'true' === api_get_plugin_setting('learning_calendar', 'enabled');
             $calendarPlugin = null;
             if ($showCalendar) {
                 $calendarPlugin = LearningCalendarPlugin::create();
@@ -404,7 +402,7 @@ class UserGroup extends Model
                    ";
         }
 
-        if ($type != -1) {
+        if (-1 != $type) {
             $type = (int) $type;
             $options['where']['AND group_type = ? '] = $type;
         }
@@ -471,7 +469,7 @@ class UserGroup extends Model
             ";
         }
 
-        if ($type != -1) {
+        if (-1 != $type) {
             $type = (int) $type;
             $options['where']['AND group_type = ? '] = $type;
         }
@@ -696,7 +694,7 @@ class UserGroup extends Model
             $where = ['where' => ['user_id = ?' => $userId]];
         }
 
-        if ($filterByType !== null) {
+        if (null !== $filterByType) {
             $where['where'][' AND g.group_type = ?'] = (int) $filterByType;
         }
 
@@ -1038,7 +1036,7 @@ class UserGroup extends Model
 
         $res = Database::query($sql);
 
-        return Database::num_rows($res) != 0;
+        return 0 != Database::num_rows($res);
     }
 
     /**
@@ -1046,7 +1044,7 @@ class UserGroup extends Model
      */
     public function allowTeachers()
     {
-        return api_get_configuration_value('allow_teachers_to_classes') === true;
+        return true === api_get_configuration_value('allow_teachers_to_classes');
     }
 
     /**
@@ -1262,7 +1260,7 @@ class UserGroup extends Model
         $params['allow_members_leave_group'] = isset($params['allow_members_leave_group']) ? 1 : 0;
 
         $groupExists = $this->usergroup_exists(trim($params['name']));
-        if ($groupExists == false) {
+        if (false == $groupExists) {
             if ($this->allowTeachers()) {
                 $params['author_id'] = api_get_user_id();
             }
@@ -1272,7 +1270,7 @@ class UserGroup extends Model
                     $this->subscribeToUrl($id, api_get_current_access_url_id());
                 }
 
-                if ($params['group_type'] == self::SOCIAL_CLASS) {
+                if (self::SOCIAL_CLASS == $params['group_type']) {
                     $this->add_user_to_group(
                         api_get_user_id(),
                         $id,
@@ -1401,7 +1399,7 @@ class UserGroup extends Model
         // If this directory does not exist - we create it.
         if (!is_dir($path)) {
             $res = @mkdir($path, api_get_permissions_for_new_directories(), true);
-            if ($res === false) {
+            if (false === $res) {
                 // There was an issue creating the directory $path, probably
                 // permissions-related
                 return false;
@@ -1416,7 +1414,7 @@ class UserGroup extends Model
         // Validation 2.
         $allowed_types = ['jpg', 'jpeg', 'png', 'gif'];
         $file = str_replace('\\', '/', $file);
-        $filename = (($pos = strrpos($file, '/')) !== false) ? substr($file, $pos + 1) : $file;
+        $filename = (false !== ($pos = strrpos($file, '/'))) ? substr($file, $pos + 1) : $file;
         $extension = strtolower(substr(strrchr($filename, '.'), 1));
         if (!in_array($extension, $allowed_types)) {
             return false;
@@ -1643,7 +1641,7 @@ class UserGroup extends Model
         $form->addElement('checkbox', 'allow_members_leave_group', '', get_lang('Allow members to leave group'));
 
         // Setting the form elements
-        if ($type === 'add') {
+        if ('add' === $type) {
             $form->addButtonCreate($header);
         } else {
             $form->addButtonUpdate($header);
@@ -1670,7 +1668,7 @@ class UserGroup extends Model
     ) {
         $picture = [];
         //$picture['style'] = $style;
-        if ($picture_file === 'unknown.jpg') {
+        if ('unknown.jpg' === $picture_file) {
             $picture['file'] = Display::returnIconPath($picture_file);
 
             return $picture;
@@ -1766,7 +1764,7 @@ class UserGroup extends Model
         $user = Database::fetch_array($res);
         $picture_filename = trim($user['picture']);
 
-        if (api_get_setting('split_users_upload_directory') === 'true') {
+        if ('true' === api_get_setting('split_users_upload_directory')) {
             if (!empty($picture_filename)) {
                 $dir = $base.'groups/'.substr($picture_filename, 0, 1).'/'.$id.'/';
             } elseif ($preview) {
@@ -1965,7 +1963,7 @@ class UserGroup extends Model
                     $group_id = (int) $group_id;
 
                     $role = $this->get_user_group_role($user_id, $group_id);
-                    if ($role == 0) {
+                    if (0 == $role) {
                         $sql = "INSERT INTO $table_url_rel_group
 		               			SET
 		               			    user_id = $user_id ,
@@ -2032,14 +2030,14 @@ class UserGroup extends Model
         if (!empty($user_id) && !empty($group_id)) {
             $role = $this->get_user_group_role($user_id, $group_id);
 
-            if ($role == 0) {
+            if (0 == $role) {
                 $sql = "INSERT INTO $table_url_rel_group
            				SET
            				    user_id = ".intval($user_id).",
            				    usergroup_id = ".intval($group_id).",
            				    relation_type = ".intval($relation_type);
                 Database::query($sql);
-            } elseif ($role == GROUP_USER_PERMISSION_PENDING_INVITATION) {
+            } elseif (GROUP_USER_PERMISSION_PENDING_INVITATION == $role) {
                 //if somebody already invited me I can be added
                 self::update_user_role($user_id, $group_id, GROUP_USER_PERMISSION_READER);
             }
@@ -2083,7 +2081,7 @@ class UserGroup extends Model
         $tbl_group = $this->table;
         $user_id = (int) $user_id;
 
-        if ($relationType == 0) {
+        if (0 == $relationType) {
             $relationCondition = '';
         } else {
             if (is_array($relationType)) {
@@ -2311,7 +2309,7 @@ class UserGroup extends Model
             $limit_text = "LIMIT $from, $limit";
         }
 
-        if (count($relation_type) == 0) {
+        if (0 == count($relation_type)) {
             $where_relation_condition = '';
         } else {
             $new_relation_type = [];
@@ -2407,7 +2405,7 @@ class UserGroup extends Model
             case GROUP_USER_PERMISSION_READER:
                 // I'm just a reader
                 $relation_group_title = get_lang('I am a reader');
-                $links .= '<li class="'.($show == 'invite_friends' ? 'active' : '').'"><a href="group_invitation.php?id='.$group_id.'">'.
+                $links .= '<li class="'.('invite_friends' == $show ? 'active' : '').'"><a href="group_invitation.php?id='.$group_id.'">'.
                             Display::return_icon('invitation_friend.png', get_lang('Invite friends')).get_lang('Invite friends').'</a></li>';
                 if (self::canLeave($group_info)) {
                     $links .= '<li><a href="group_view.php?id='.$group_id.'&action=leave&u='.api_get_user_id().'">'.
@@ -2416,11 +2414,11 @@ class UserGroup extends Model
                 break;
             case GROUP_USER_PERMISSION_ADMIN:
                 $relation_group_title = get_lang('I am an admin');
-                $links .= '<li class="'.($show == 'group_edit' ? 'active' : '').'"><a href="group_edit.php?id='.$group_id.'">'.
+                $links .= '<li class="'.('group_edit' == $show ? 'active' : '').'"><a href="group_edit.php?id='.$group_id.'">'.
                             Display::return_icon('group_edit.png', get_lang('Edit this group')).get_lang('Edit this group').'</a></li>';
-                $links .= '<li class="'.($show == 'member_list' ? 'active' : '').'"><a href="group_waiting_list.php?id='.$group_id.'">'.
+                $links .= '<li class="'.('member_list' == $show ? 'active' : '').'"><a href="group_waiting_list.php?id='.$group_id.'">'.
                             Display::return_icon('waiting_list.png', get_lang('Waiting list')).get_lang('Waiting list').'</a></li>';
-                $links .= '<li class="'.($show == 'invite_friends' ? 'active' : '').'"><a href="group_invitation.php?id='.$group_id.'">'.
+                $links .= '<li class="'.('invite_friends' == $show ? 'active' : '').'"><a href="group_invitation.php?id='.$group_id.'">'.
                             Display::return_icon('invitation_friend.png', get_lang('Invite friends')).get_lang('Invite friends').'</a></li>';
                 if (self::canLeave($group_info)) {
                     $links .= '<li><a href="group_view.php?id='.$group_id.'&action=leave&u='.api_get_user_id().'">'.
@@ -2438,7 +2436,7 @@ class UserGroup extends Model
                 //$links .=  '<li><a href="'.api_get_path(WEB_CODE_PATH).'social/message_for_group_form.inc.php?view_panel=1&height=400&width=610&&user_friend='.api_get_user_id().'&group_id='.$group_id.'&action=add_message_group" class="thickbox" title="'.get_lang('Compose message').'">'.Display::return_icon('compose_message.png', get_lang('Create thread'), array('hspace'=>'6')).'<span class="social-menu-text4" >'.get_lang('Create thread').'</span></a></li>';
                 //$links .=  '<li><a href="groups.php?id='.$group_id.'">'.				Display::return_icon('message_list.png', get_lang('Messages list'), array('hspace'=>'6')).'<span class="'.($show=='messages_list'?'social-menu-text-active':'social-menu-text4').'" >'.get_lang('Messages list').'</span></a></li>';
                 //$links .=  '<li><a href="group_members.php?id='.$group_id.'">'.		Display::return_icon('member_list.png', get_lang('Members list'), array('hspace'=>'6')).'<span class="'.($show=='member_list'?'social-menu-text-active':'social-menu-text4').'" >'.get_lang('Members list').'</span></a></li>';
-                if ($group_info['visibility'] == GROUP_PERMISSION_CLOSED) {
+                if (GROUP_PERMISSION_CLOSED == $group_info['visibility']) {
                     $links .= '<li><a href="group_waiting_list.php?id='.$group_id.'">'.
                                 Display::return_icon('waiting_list.png', get_lang('Waiting list')).get_lang('Waiting list').'</a></li>';
                 }
@@ -2520,7 +2518,7 @@ class UserGroup extends Model
         $tbl_group = $this->table;
         $user_id = intval($user_id);
 
-        if ($relation_type == 0) {
+        if (0 == $relation_type) {
             $where_relation_condition = '';
         } else {
             $relation_type = intval($relation_type);
@@ -2622,7 +2620,7 @@ class UserGroup extends Model
             } else {
                 $select_part .= "rg$rg_number.group_id as id_$rg_number, ";
             }
-            if ($i == 1) {
+            if (1 == $i) {
                 $cond_part .= "FROM $t_rel_group rg0 
                                LEFT JOIN $t_rel_group rg$i 
                                ON rg$rg_number.group_id = rg$i.subgroup_id ";
@@ -2725,7 +2723,7 @@ class UserGroup extends Model
             $select .= "g$i.id as id_$i ";
             $select .= $i != $levels ? ', ' : null;
 
-            if ($i == 1) {
+            if (1 == $i) {
                 $from .= " INNER JOIN $groupRelGroupTable gg0 
                            ON g1.id = gg0.subgroup_id and gg0.group_id = $groupId ";
             } else {
@@ -2763,12 +2761,12 @@ class UserGroup extends Model
         $table = Database::get_main_table(TABLE_USERGROUP_REL_USERGROUP);
         $group_id = (int) $group_id;
         $parent_group_id = (int) $parent_group_id;
-        if ($parent_group_id == 0) {
+        if (0 == $parent_group_id) {
             $sql = "DELETE FROM $table WHERE subgroup_id = $group_id";
         } else {
             $sql = "SELECT group_id FROM $table WHERE subgroup_id = $group_id";
             $res = Database::query($sql);
-            if (Database::num_rows($res) == 0) {
+            if (0 == Database::num_rows($res)) {
                 $sql = "INSERT INTO $table SET
                         group_id = $parent_group_id,
                         subgroup_id = $group_id,
@@ -2833,7 +2831,7 @@ class UserGroup extends Model
      */
     public static function canLeave($groupInfo)
     {
-        return $groupInfo['allow_members_leave_group'] == 1 ? true : false;
+        return 1 == $groupInfo['allow_members_leave_group'] ? true : false;
     }
 
     /**
diff --git a/public/main/inc/lib/usermanager.lib.php b/public/main/inc/lib/usermanager.lib.php
index e73ff78204..e7f4f3a7b7 100644
--- a/public/main/inc/lib/usermanager.lib.php
+++ b/public/main/inc/lib/usermanager.lib.php
@@ -238,7 +238,7 @@ class UserManager
             }
         }
 
-        if ($status === 1 &&
+        if (1 === $status &&
             isset($_configuration[$access_url_id]) &&
             is_array($_configuration[$access_url_id]) &&
             isset($_configuration[$access_url_id]['hosting_limit_teachers']) &&
@@ -259,7 +259,7 @@ class UserManager
         }
 
         if (empty($password)) {
-            if ($authSource === PLATFORM_AUTH_SOURCE) {
+            if (PLATFORM_AUTH_SOURCE === $authSource) {
                 Display::addFlash(
                     Display::return_message(
                         get_lang('Required field').': '.get_lang(
@@ -293,14 +293,14 @@ class UserManager
         $currentDate = api_get_utc_datetime();
         $now = new DateTime();
 
-        if (empty($expirationDate) || $expirationDate == '0000-00-00 00:00:00') {
+        if (empty($expirationDate) || '0000-00-00 00:00:00' == $expirationDate) {
             // Default expiration date
             // if there is a default duration of a valid account then
             // we have to change the expiration_date accordingly
             // Accept 0000-00-00 00:00:00 as a null value to avoid issues with
             // third party code using this method with the previous (pre-1.10)
             // value of 0000...
-            if (api_get_setting('account_valid_duration') != '') {
+            if ('' != api_get_setting('account_valid_duration')) {
                 $expirationDate = new DateTime($currentDate);
                 $days = (int) api_get_setting('account_valid_duration');
                 $expirationDate->modify('+'.$days.' day');
@@ -459,7 +459,7 @@ class UserManager
                 $url = api_get_path(WEB_PATH);
                 if (api_is_multiple_url_enabled()) {
                     $access_url_id = api_get_current_access_url_id();
-                    if ($access_url_id != -1) {
+                    if (-1 != $access_url_id) {
                         $urlInfo = api_get_access_url($access_url_id);
                         if ($urlInfo) {
                             $url = $urlInfo['url'];
@@ -510,7 +510,7 @@ class UserManager
                 }
 
                 $twoEmail = api_get_configuration_value('send_two_inscription_confirmation_mail');
-                if ($twoEmail === true) {
+                if (true === $twoEmail) {
                     $layoutContent = $tplContent->get_template('mail/new_user_first_email_confirmation.tpl');
                     $emailBody = $tplContent->fetch($layoutContent);
 
@@ -713,7 +713,7 @@ class UserManager
             $sql = "SELECT id FROM $table_course_user
                     WHERE status=1 AND c_id = ".intval($course->c_id);
             $res2 = Database::query($sql);
-            if (Database::num_rows($res2) == 1) {
+            if (1 == Database::num_rows($res2)) {
                 return false;
             }
         }
@@ -836,7 +836,7 @@ class UserManager
 
         //UrlManager::deleteUserFromAllUrls($user_id);
 
-        if (api_get_setting('allow_social_tool') === 'true') {
+        if ('true' === api_get_setting('allow_social_tool')) {
             $userGroup = new UserGroup();
             //Delete user from portal groups
             $group_list = $userGroup->get_groups_by_user($user_id);
@@ -962,7 +962,7 @@ class UserManager
     {
         $result = false;
         $ids = is_array($ids) ? $ids : func_get_args();
-        if (!is_array($ids) || count($ids) == 0) {
+        if (!is_array($ids) || 0 == count($ids)) {
             return false;
         }
         $ids = array_map('intval', $ids);
@@ -1004,7 +1004,7 @@ class UserManager
 
         $sql = "UPDATE $table_user SET active = 0 WHERE id IN ($ids)";
         $r = Database::query($sql);
-        if ($r !== false) {
+        if (false !== $r) {
             Event::addEvent(LOG_USER_DISABLE, LOG_USER_ID, $ids);
 
             return true;
@@ -1040,7 +1040,7 @@ class UserManager
 
         $sql = "UPDATE $table_user SET active = 1 WHERE id IN ($ids)";
         $r = Database::query($sql);
-        if ($r !== false) {
+        if (false !== $r) {
             Event::addEvent(LOG_USER_ENABLE, LOG_USER_ID, $ids);
 
             return true;
@@ -1122,16 +1122,16 @@ class UserManager
             return false;
         }
 
-        if ($reset_password == 0) {
+        if (0 == $reset_password) {
             $password = null;
             $auth_source = $user->getAuthSource();
-        } elseif ($reset_password == 1) {
+        } elseif (1 == $reset_password) {
             $original_password = $password = api_generate_password();
             $auth_source = PLATFORM_AUTH_SOURCE;
-        } elseif ($reset_password == 2) {
+        } elseif (2 == $reset_password) {
             $password = $password;
             $auth_source = PLATFORM_AUTH_SOURCE;
-        } elseif ($reset_password == 3) {
+        } elseif (3 == $reset_password) {
             $password = $password;
             $auth_source = $auth_source;
         }
@@ -1153,7 +1153,7 @@ class UserManager
         // If username is different from original then check if it exists.
         if ($originalUsername !== $username) {
             $available = self::is_username_available($username);
-            if ($available === false) {
+            if (false === $available) {
                 return false;
             }
         }
@@ -1205,8 +1205,8 @@ class UserManager
 
         $userManager->updateUser($user, true);
 
-        if ($change_active == 1) {
-            if ($active == 1) {
+        if (1 == $change_active) {
+            if (1 == $active) {
                 $event_title = LOG_USER_ENABLE;
             } else {
                 $event_title = LOG_USER_DISABLE;
@@ -1238,7 +1238,7 @@ class UserManager
             $url = api_get_path(WEB_PATH);
             if (api_is_multiple_url_enabled()) {
                 $access_url_id = api_get_current_access_url_id();
-                if ($access_url_id != -1) {
+                if (-1 != $access_url_id) {
                     $url = api_get_access_url($access_url_id);
                     $url = $url['url'];
                 }
@@ -1300,7 +1300,7 @@ class UserManager
         }
 
         $cacheAvailable = api_get_configuration_value('apc');
-        if ($cacheAvailable === true) {
+        if (true === $cacheAvailable) {
             $apcVar = api_get_configuration_value('apc_prefix').'userinfo_'.$user_id;
             if (apcu_exists($apcVar)) {
                 apcu_delete($apcVar);
@@ -1409,7 +1409,7 @@ class UserManager
                 WHERE username = '".Database::escape_string($username)."'";
         $res = Database::query($sql);
 
-        return Database::num_rows($res) == 0;
+        return 0 == Database::num_rows($res);
     }
 
     /**
@@ -1440,7 +1440,7 @@ class UserManager
         );
         //Looking for a space in the lastname
         $pos = api_strpos($lastname, ' ');
-        if ($pos !== false) {
+        if (false !== $pos) {
             $lastname = api_substr($lastname, 0, $pos);
         }
 
@@ -1513,7 +1513,7 @@ class UserManager
             // into ASCII letters in order they not to be totally removed.
             // 2. Applying the strict purifier.
             // 3. Length limitation.
-            $return = api_get_setting('login_is_email') === 'true' ? substr(preg_replace(USERNAME_PURIFIER_MAIL, '', $username), 0, USERNAME_MAX_LENGTH) : substr(preg_replace(USERNAME_PURIFIER, '', $username), 0, USERNAME_MAX_LENGTH);
+            $return = 'true' === api_get_setting('login_is_email') ? substr(preg_replace(USERNAME_PURIFIER_MAIL, '', $username), 0, USERNAME_MAX_LENGTH) : substr(preg_replace(USERNAME_PURIFIER, '', $username), 0, USERNAME_MAX_LENGTH);
             $return = URLify::transliterate($return);
 
             return $return;
@@ -1546,7 +1546,7 @@ class UserManager
             'first'
         );
 
-        if ($resultData === false) {
+        if (false === $resultData) {
             return false;
         }
 
@@ -1579,7 +1579,7 @@ class UserManager
      */
     public static function is_username_empty($username)
     {
-        return strlen(self::purify_username($username, false)) == 0;
+        return 0 == strlen(self::purify_username($username, false));
     }
 
     /**
@@ -1933,7 +1933,7 @@ class UserManager
         }
 
         $userPath = "users/$id/";
-        if (api_get_setting('split_users_upload_directory') === 'true') {
+        if ('true' === api_get_setting('split_users_upload_directory')) {
             $userPath = 'users/'.substr((string) $id, 0, 1).'/'.$id.'/';
             // In exceptional cases, on some portals, the intermediate base user
             // directory might not have been created. Make sure it is before
@@ -1983,7 +1983,7 @@ class UserManager
         $userInfo = []
     ) {
         // Make sure userInfo is defined. Otherwise, define it!
-        if (empty($userInfo) || !is_array($userInfo) || count($userInfo) == 0) {
+        if (empty($userInfo) || !is_array($userInfo) || 0 == count($userInfo)) {
             if (empty($user_id)) {
                 return '';
             } else {
@@ -2028,8 +2028,8 @@ class UserManager
 
         $gravatarEnabled = api_get_setting('gravatar_enabled');
         $anonymousPath = Display::returnIconPath('unknown.png', $pictureAnonymousSize);
-        if ($pictureWebFile == 'unknown.jpg' || empty($pictureWebFile)) {
-            if ($gravatarEnabled === 'true') {
+        if ('unknown.jpg' == $pictureWebFile || empty($pictureWebFile)) {
+            if ('true' === $gravatarEnabled) {
                 $file = self::getGravatar(
                     $imageWebPath['email'],
                     $gravatarSize,
@@ -2115,8 +2115,8 @@ class UserManager
         $old_file = $path_info['file'];
 
         // Let us delete them.
-        if ($old_file != 'unknown.jpg') {
-            if (api_get_setting('platform.keep_old_images_after_delete') == 'true') {
+        if ('unknown.jpg' != $old_file) {
+            if ('true' == api_get_setting('platform.keep_old_images_after_delete')) {
                 $prefix = 'saved_'.date('Y_m_d_H_i_s').'_'.uniqid('').'_';
                 @rename($path.'small_'.$old_file, $path.$prefix.'small_'.$old_file);
                 @rename($path.'medium_'.$old_file, $path.$prefix.'medium_'.$old_file);
@@ -2138,17 +2138,17 @@ class UserManager
         // Validation 2.
         $allowed_types = api_get_supported_image_extensions();
         $file = str_replace('\\', '/', $file);
-        $filename = (($pos = strrpos($file, '/')) !== false) ? substr($file, $pos + 1) : $file;
+        $filename = (false !== ($pos = strrpos($file, '/'))) ? substr($file, $pos + 1) : $file;
         $extension = strtolower(substr(strrchr($filename, '.'), 1));
         if (!in_array($extension, $allowed_types)) {
             return false;
         }
 
         // This is the common name for the new photos.
-        if ($old_file != 'unknown.jpg') {
+        if ('unknown.jpg' != $old_file) {
             $old_extension = strtolower(substr(strrchr($old_file, '.'), 1));
             $filename = in_array($old_extension, $allowed_types) ? substr($old_file, 0, -strlen($old_extension)) : $old_file;
-            $filename = (substr($filename, -1) == '.') ? $filename.$extension : $filename.'.'.$extension;
+            $filename = ('.' == substr($filename, -1)) ? $filename.$extension : $filename.'.'.$extension;
         } else {
             $filename = api_replace_dangerous_char($filename);
             $filename = uniqid('').'_'.$filename;
@@ -2326,9 +2326,9 @@ class UserManager
         if (is_dir($production_repository)) {
             $handle = opendir($production_repository);
             while ($file = readdir($handle)) {
-                if ($file == '.' ||
-                    $file == '..' ||
-                    $file == '.htaccess' ||
+                if ('.' == $file ||
+                    '..' == $file ||
+                    '.htaccess' == $file ||
                     is_dir($production_repository.$file)
                 ) {
                     // skip current/parent directory and .htaccess
@@ -2435,7 +2435,7 @@ class UserManager
             $sqlf .= " AND filter = $field_filter ";
         }
         $sqlf .= " ORDER BY ".$columns[$column]." $sort_direction ";
-        if ($number_of_items != 0) {
+        if (0 != $number_of_items) {
             $sqlf .= " LIMIT ".intval($from).','.intval($number_of_items);
         }
         $resf = Database::query($sqlf);
@@ -2611,7 +2611,7 @@ class UserManager
         $res = Database::query($sql);
         if (Database::num_rows($res) > 0) {
             while ($row = Database::fetch_array($res)) {
-                if ($row['type'] == self::USER_FIELD_TYPE_TAG) {
+                if (self::USER_FIELD_TYPE_TAG == $row['type']) {
                     $tags = self::get_user_tags_to_string($user_id, $row['id'], false);
                     $extra_data['extra_'.$row['fvar']] = $tags;
                 } else {
@@ -2627,7 +2627,7 @@ class UserManager
                     if (Database::num_rows($resu) > 0) {
                         $rowu = Database::fetch_array($resu);
                         $fval = $rowu['fval'];
-                        if ($row['type'] == self::USER_FIELD_TYPE_SELECT_MULTIPLE) {
+                        if (self::USER_FIELD_TYPE_SELECT_MULTIPLE == $row['type']) {
                             $fval = explode(';', $rowu['fval']);
                         }
                     } else {
@@ -2637,13 +2637,13 @@ class UserManager
                     // We get here (and fill the $extra_data array) even if there
                     // is no user with data (we fill it with default values)
                     if ($prefix) {
-                        if ($row['type'] == self::USER_FIELD_TYPE_RADIO) {
+                        if (self::USER_FIELD_TYPE_RADIO == $row['type']) {
                             $extra_data['extra_'.$row['fvar']]['extra_'.$row['fvar']] = $fval;
                         } else {
                             $extra_data['extra_'.$row['fvar']] = $fval;
                         }
                     } else {
-                        if ($row['type'] == self::USER_FIELD_TYPE_RADIO) {
+                        if (self::USER_FIELD_TYPE_RADIO == $row['type']) {
                             $extra_data['extra_'.$row['fvar']]['extra_'.$row['fvar']] = $fval;
                         } else {
                             $extra_data[$row['fvar']] = $fval;
@@ -2705,7 +2705,7 @@ class UserManager
                 if (Database::num_rows($resu) > 0) {
                     $rowu = Database::fetch_array($resu);
                     $fval = $rowu['fval'];
-                    if ($row['type'] == self::USER_FIELD_TYPE_SELECT_MULTIPLE) {
+                    if (self::USER_FIELD_TYPE_SELECT_MULTIPLE == $row['type']) {
                         $fval = explode(';', $rowu['fval']);
                     }
                 }
@@ -2957,7 +2957,7 @@ class UserManager
         $order = 'ORDER BY sc.name, s.name';
 
         // Order by date if showing all sessions
-        $showAllSessions = api_get_configuration_value('show_all_sessions_on_my_course_page') === true;
+        $showAllSessions = true === api_get_configuration_value('show_all_sessions_on_my_course_page');
         if ($showAllSessions) {
             $order = 'ORDER BY s.accessStartDate';
         }
@@ -2978,7 +2978,7 @@ class UserManager
                     break;
                 case 'end_date':
                     $order = " ORDER BY s.accessEndDate $orderSetting ";
-                    if ($orderSetting == 'asc') {
+                    if ('asc' == $orderSetting) {
                         // Put null values at the end
                         // https://stackoverflow.com/questions/12652034/how-can-i-order-by-null-in-dql
                         $order = ' ORDER BY _isFieldNull asc, s.accessEndDate asc';
@@ -3043,7 +3043,7 @@ class UserManager
             $daysLeft = SessionManager::getDayLeftInSession($row, $user_id);
 
             // User portal filters:
-            if ($ignoreTimeLimit === false) {
+            if (false === $ignoreTimeLimit) {
                 if ($is_time_over) {
                     // History
                     if ($row['duration']) {
@@ -3097,7 +3097,7 @@ class UserManager
                 $ignore_visibility_for_admins
             );
 
-            if ($visibility != SESSION_VISIBLE) {
+            if (SESSION_VISIBLE != $visibility) {
                 // Course Coach session visibility.
                 $blockedCourseCount = 0;
                 $closedVisibilityList = [
@@ -3114,7 +3114,7 @@ class UserManager
                     );
 
                     $courseIsVisible = !in_array($course['visibility'], $closedVisibilityList);
-                    if ($courseIsVisible === false || $sessionCourseVisibility == SESSION_INVISIBLE) {
+                    if (false === $courseIsVisible || SESSION_INVISIBLE == $sessionCourseVisibility) {
                         $blockedCourseCount++;
                     }
                 }
@@ -3133,7 +3133,7 @@ class UserManager
                 case SESSION_AVAILABLE:
                     break;
                 case SESSION_INVISIBLE:
-                    if ($ignore_visibility_for_admins === false) {
+                    if (false === $ignore_visibility_for_admins) {
                         continue 2;
                     }
             }
@@ -3197,7 +3197,7 @@ class UserManager
         $join_access_url = $where_access_url = '';
         if (api_get_multiple_access_url()) {
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $tbl_url_course = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
                 $join_access_url = "LEFT JOIN $tbl_url_course url_rel_course ON url_rel_course.c_id = course.id";
                 $where_access_url = " AND access_url_id = $access_url_id ";
@@ -3307,7 +3307,7 @@ class UserManager
                 $session_id = $enreg['id'];
                 $session_visibility = api_get_session_visibility($session_id);
 
-                if ($session_visibility == SESSION_INVISIBLE) {
+                if (SESSION_INVISIBLE == $session_visibility) {
                     continue;
                 }
 
@@ -3350,7 +3350,7 @@ class UserManager
         foreach ($sessions as $enreg) {
             $session_id = $enreg['id'];
             $session_visibility = api_get_session_visibility($session_id);
-            if ($session_visibility == SESSION_INVISIBLE) {
+            if (SESSION_INVISIBLE == $session_visibility) {
                 continue;
             }
 
@@ -3413,7 +3413,7 @@ class UserManager
         $join_access_url = $where_access_url = '';
         if (api_get_multiple_access_url()) {
             $urlId = api_get_current_access_url_id();
-            if ($urlId != -1) {
+            if (-1 != $urlId) {
                 $tbl_url_session = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
                 $join_access_url = " ,  $tbl_url_session url_rel_session ";
                 $where_access_url = " AND access_url_id = $urlId AND url_rel_session.session_id = $session_id ";
@@ -3568,10 +3568,10 @@ class UserManager
         $sql = "SELECT id FROM $t_user WHERE username = '$username'";
         $res = Database::query($sql);
 
-        if ($res === false) {
+        if (false === $res) {
             return false;
         }
-        if (Database::num_rows($res) !== 1) {
+        if (1 !== Database::num_rows($res)) {
             return false;
         }
         $row = Database::fetch_array($res);
@@ -3604,7 +3604,7 @@ class UserManager
             if (is_dir($path)) {
                 $handle = opendir($path);
                 while ($file = readdir($handle)) {
-                    if ($file == '.' || $file == '..' || $file == '.htaccess' || is_dir($path.$file)) {
+                    if ('.' == $file || '..' == $file || '.htaccess' == $file || is_dir($path.$file)) {
                         continue; // skip current/parent directory and .htaccess
                     }
                     $file_list[] = $file;
@@ -3615,10 +3615,10 @@ class UserManager
                 }
                 $extensionList = ['jpg', 'jpeg', 'png', 'gif', 'bmp', 'tif'];
                 foreach ($file_list as $file) {
-                    if ($resourceType == 'all') {
+                    if ('all' == $resourceType) {
                         $return .= '<li>
                             <a href="'.$web_path.urlencode($file).'" target="_blank">'.htmlentities($file).'</a></li>';
-                    } elseif ($resourceType == 'images') {
+                    } elseif ('images' == $resourceType) {
                         //get extension
                         $ext = explode('.', $file);
                         if (isset($ext[1]) && in_array($ext[1], $extensionList)) {
@@ -3655,21 +3655,21 @@ class UserManager
         if (empty($user_id)) {
             $user_id = api_get_user_id();
         }
-        if ($user_id === false) {
+        if (false === $user_id) {
             return false;
         }
         $service_name = Database::escape_string($api_service);
-        if (is_string($service_name) === false) {
+        if (false === is_string($service_name)) {
             return false;
         }
         $t_api = Database::get_main_table(TABLE_MAIN_USER_API_KEY);
         $sql = "SELECT * FROM $t_api WHERE user_id = $user_id AND api_service='$api_service';";
         $res = Database::query($sql);
-        if ($res === false) {
+        if (false === $res) {
             return false;
         } //error during query
         $num = Database::num_rows($res);
-        if ($num == 0) {
+        if (0 == $num) {
             return false;
         }
         $list = [];
@@ -3696,23 +3696,23 @@ class UserManager
         if (empty($user_id)) {
             $user_id = api_get_user_id();
         }
-        if ($user_id === false) {
+        if (false === $user_id) {
             return false;
         }
         $service_name = Database::escape_string($api_service);
-        if (is_string($service_name) === false) {
+        if (false === is_string($service_name)) {
             return false;
         }
         $t_api = Database::get_main_table(TABLE_MAIN_USER_API_KEY);
         $md5 = md5((time() + ($user_id * 5)) - rand(10000, 10000)); //generate some kind of random key
         $sql = "INSERT INTO $t_api (user_id, api_key,api_service) VALUES ($user_id,'$md5','$service_name')";
         $res = Database::query($sql);
-        if ($res === false) {
+        if (false === $res) {
             return false;
         } //error during query
         $num = Database::insert_id();
 
-        return $num == 0 ? false : $num;
+        return 0 == $num ? false : $num;
     }
 
     /**
@@ -3727,22 +3727,22 @@ class UserManager
         if ($key_id != strval(intval($key_id))) {
             return false;
         }
-        if ($key_id === false) {
+        if (false === $key_id) {
             return false;
         }
         $t_api = Database::get_main_table(TABLE_MAIN_USER_API_KEY);
         $sql = "SELECT * FROM $t_api WHERE id = ".$key_id;
         $res = Database::query($sql);
-        if ($res === false) {
+        if (false === $res) {
             return false;
         } //error during query
         $num = Database::num_rows($res);
-        if ($num !== 1) {
+        if (1 !== $num) {
             return false;
         }
         $sql = "DELETE FROM $t_api WHERE id = ".$key_id;
         $res = Database::query($sql);
-        if ($res === false) {
+        if (false === $res) {
             return false;
         } //error during query
 
@@ -3762,11 +3762,11 @@ class UserManager
         if ($user_id != strval(intval($user_id))) {
             return false;
         }
-        if ($user_id === false) {
+        if (false === $user_id) {
             return false;
         }
         $service_name = Database::escape_string($api_service);
-        if (is_string($service_name) === false) {
+        if (false === is_string($service_name)) {
             return false;
         }
         $t_api = Database::get_main_table(TABLE_MAIN_USER_API_KEY);
@@ -3774,11 +3774,11 @@ class UserManager
                 WHERE user_id=".$user_id." AND api_service='".$api_service."'";
         $res = Database::query($sql);
         $num = Database::num_rows($res);
-        if ($num == 1) {
+        if (1 == $num) {
             $id_key = Database::fetch_array($res, 'ASSOC');
             self::delete_api_key($id_key['id']);
             $num = self::add_api_key($user_id, $api_service);
-        } elseif ($num == 0) {
+        } elseif (0 == $num) {
             $num = self::add_api_key($user_id, $api_service);
         }
 
@@ -3796,7 +3796,7 @@ class UserManager
         if ($user_id != strval(intval($user_id))) {
             return false;
         }
-        if ($user_id === false) {
+        if (false === $user_id) {
             return false;
         }
         if (empty($api_service)) {
@@ -3834,7 +3834,7 @@ class UserManager
         $sql = "SELECT * FROM $admin_table WHERE user_id = $user_id";
         $res = Database::query($sql);
 
-        return Database::num_rows($res) === 1;
+        return 1 === Database::num_rows($res);
     }
 
     /**
@@ -3869,13 +3869,13 @@ class UserManager
             $sql .= " AND u.status = $status ";
         }
 
-        if ($active !== null) {
+        if (null !== $active) {
             $active = (int) $active;
             $sql .= " AND u.active = $active ";
         }
 
         $res = Database::query($sql);
-        if (Database::num_rows($res) === 1) {
+        if (1 === Database::num_rows($res)) {
             return (int) Database::result($res, 0, 0);
         }
 
@@ -3920,7 +3920,7 @@ class UserManager
                 $return[] = ['id' => $row['tag'], 'text' => $row['tag']];
             }
         }
-        if ($return_format === 'json') {
+        if ('json' === $return_format) {
             $return = json_encode($return);
         }
 
@@ -4135,7 +4135,7 @@ class UserManager
         }
 
         //this is a new tag
-        if ($tag_id == 0) {
+        if (0 == $tag_id) {
             //the tag doesn't exist
             $sql = "INSERT INTO $table_user_tag (tag, field_id,count) VALUES ('$tag','$field_id', count + 1)";
             Database::query($sql);
@@ -4147,13 +4147,13 @@ class UserManager
             $last_insert_id = $tag_id;
         }
 
-        if (!empty($last_insert_id) && ($last_insert_id != 0)) {
+        if (!empty($last_insert_id) && (0 != $last_insert_id)) {
             //we insert the relationship user-tag
             $sql = "SELECT tag_id FROM $table_user_tag_values
                     WHERE user_id = $user_id AND tag_id = $last_insert_id ";
             $result = Database::query($sql);
             //if the relationship does not exist we create it
-            if (Database::num_rows($result) == 0) {
+            if (0 == Database::num_rows($result)) {
                 $sql = "INSERT INTO $table_user_tag_values SET user_id = $user_id, tag_id = $last_insert_id";
                 Database::query($sql);
             }
@@ -4279,7 +4279,7 @@ class UserManager
 
         $where_field = "";
         $where_extra_fields = self::get_search_form_where_extra_fields();
-        if ($field_id != 0) {
+        if (0 != $field_id) {
             $where_field = " field_id = $field_id AND ";
         }
 
@@ -4359,7 +4359,7 @@ class UserManager
         if (is_array($extraFieldList)) {
             foreach ($extraFieldList as $extraField) {
                 // If is enabled to filter and is a "<select>" field type
-                if ($extraField[8] == 1 && $extraField[2] == 4) {
+                if (1 == $extraField[8] && 4 == $extraField[2]) {
                     $fields[] = [
                         'name' => $extraField[3],
                         'variable' => $extraField[1],
@@ -4387,7 +4387,7 @@ class UserManager
             foreach ($extraFields as $extraField) {
                 $varName = 'field_'.$extraField['variable'];
                 if (self::is_extra_field_available($extraField['variable'])) {
-                    if (isset($_GET[$varName]) && $_GET[$varName] != '0') {
+                    if (isset($_GET[$varName]) && '0' != $_GET[$varName]) {
                         $useExtraFields = true;
                         $extraFieldResult[] = self::get_extra_user_data_by_value(
                             $extraField['variable'],
@@ -4560,7 +4560,7 @@ class UserManager
         $row = Database::fetch_array($result, 'ASSOC');
         $current_date = api_get_utc_datetime();
 
-        if ($row['count'] == 0) {
+        if (0 == $row['count']) {
             $sql = 'INSERT INTO '.$tbl_my_friend.'(friend_user_id,user_id,relation_type,last_edit)
                     VALUES ('.$friend_id.','.$my_user_id.','.$relation_type.',"'.$current_date.'")';
             Database::query($sql);
@@ -4576,10 +4576,10 @@ class UserManager
         $result = Database::query($sql);
         $row = Database::fetch_array($result, 'ASSOC');
 
-        if ($row['count'] == 1) {
+        if (1 == $row['count']) {
             //only for the case of a RRHH or a Student BOSS
             if ($row['relation_type'] != $relation_type &&
-                ($relation_type == USER_RELATION_TYPE_RRHH || $relation_type == USER_RELATION_TYPE_BOSS)
+                (USER_RELATION_TYPE_RRHH == $relation_type || USER_RELATION_TYPE_BOSS == $relation_type)
             ) {
                 $sql = 'INSERT INTO '.$tbl_my_friend.'(friend_user_id,user_id,relation_type,last_edit)
                         VALUES ('.$friend_id.','.$my_user_id.','.$relation_type.',"'.$current_date.'")';
@@ -4617,7 +4617,7 @@ class UserManager
 
         if ($real_removed) {
             $extra_condition = '';
-            if ($with_status_condition != '') {
+            if ('' != $with_status_condition) {
                 $extra_condition = ' AND relation_type = '.intval($with_status_condition);
             }
             $sql = 'DELETE FROM '.$tbl_my_friend.'
@@ -4638,7 +4638,7 @@ class UserManager
                         friend_user_id='.$friend_id;
             $result = Database::query($sql);
             $row = Database::fetch_array($result, 'ASSOC');
-            if ($row['count'] == 1) {
+            if (1 == $row['count']) {
                 //Delete user rel user
                 $sql_i = 'UPDATE '.$tbl_my_friend.' SET relation_type='.USER_RELATION_TYPE_DELETED.'
                           WHERE user_id='.$user_id.' AND friend_user_id='.$friend_id;
@@ -4955,7 +4955,7 @@ class UserManager
         }
 
         $orderBy = null;
-        if ($getOnlyUserId == false) {
+        if (false == $getOnlyUserId) {
             if (api_is_western_name_order()) {
                 $orderBy .= " ORDER BY firstname, lastname ";
             } else {
@@ -5119,7 +5119,7 @@ class UserManager
 
                 $result = Database::query($sql);
                 $num = Database::num_rows($result);
-                if ($num === 0) {
+                if (0 === $num) {
                     $date = api_get_utc_datetime();
                     $sql = "INSERT INTO $userRelUserTable (user_id, friend_user_id, relation_type, last_edit)
                             VALUES ($subscribedUserId, $userId, $relationType, '$date')";
@@ -5180,7 +5180,7 @@ class UserManager
 
         $courseId = $courseInfo['real_id'];
 
-        if ($session == 0 || is_null($session)) {
+        if (0 == $session || is_null($session)) {
             $sql = 'SELECT u.id uid FROM '.$table_user.' u
                     INNER JOIN '.$table_course_user.' ru
                     ON ru.user_id = u.id
@@ -5189,7 +5189,7 @@ class UserManager
                         ru.c_id = "'.$courseId.'" ';
             $rs = Database::query($sql);
             $num_rows = Database::num_rows($rs);
-            if ($num_rows == 1) {
+            if (1 == $num_rows) {
                 $row = Database::fetch_array($rs);
 
                 return $row['uid'];
@@ -5237,7 +5237,7 @@ class UserManager
         $rs = Database::query($sql);
         $row = Database::fetch_array($rs);
 
-        if ($row['path_certificate'] == '' || is_null($row['path_certificate'])) {
+        if ('' == $row['path_certificate'] || is_null($row['path_certificate'])) {
             return false;
         }
 
@@ -5641,7 +5641,7 @@ class UserManager
             'first'
         );
 
-        if ($trackResult != false) {
+        if (false != $trackResult) {
             return $trackResult['total_time'] ? $trackResult['total_time'] : 0;
         }
 
@@ -5789,7 +5789,7 @@ SQL;
     public static function getUserSubscriptionTab($optionSelected = 1)
     {
         $allowAdmin = api_get_setting('allow_user_course_subscription_by_course_admin');
-        if (($allowAdmin === 'true' && api_is_allowed_to_edit()) ||
+        if (('true' === $allowAdmin && api_is_allowed_to_edit()) ||
             api_is_platform_admin()
         ) {
             $userPath = api_get_path(WEB_CODE_PATH).'user/';
@@ -5887,7 +5887,7 @@ SQL;
             Session::write('_uid', $userId);
             Session::write('_user', $userInfo);
             Session::write('is_platformAdmin', (bool) self::is_admin($userId));
-            Session::write('is_allowedCreateCourse', $userInfo['status'] == 1);
+            Session::write('is_allowedCreateCourse', 1 == $userInfo['status']);
             // will be useful later to know if the user is actually an admin or not (example reporting)
             Session::write('login_as', true);
             $logInfo = [
@@ -6090,56 +6090,56 @@ SQL;
             $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ACCESS);
             $sql = "UPDATE $table set user_ip = '$substitute' WHERE access_user_id = $userId";
             $res = Database::query($sql);
-            if ($res === false && $debug > 0) {
+            if (false === $res && $debug > 0) {
                 error_log("Could not anonymize IP address for user $userId ($sql)");
             }
 
             $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_COURSE_ACCESS);
             $sql = "UPDATE $table set user_ip = '$substitute' WHERE user_id = $userId";
             $res = Database::query($sql);
-            if ($res === false && $debug > 0) {
+            if (false === $res && $debug > 0) {
                 error_log("Could not anonymize IP address for user $userId ($sql)");
             }
 
             $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
             $sql = "UPDATE $table set user_ip = '$substitute' WHERE exe_user_id = $userId";
             $res = Database::query($sql);
-            if ($res === false && $debug > 0) {
+            if (false === $res && $debug > 0) {
                 error_log("Could not anonymize IP address for user $userId ($sql)");
             }
 
             $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_LOGIN);
             $sql = "UPDATE $table set user_ip = '$substitute' WHERE login_user_id = $userId";
             $res = Database::query($sql);
-            if ($res === false && $debug > 0) {
+            if (false === $res && $debug > 0) {
                 error_log("Could not anonymize IP address for user $userId ($sql)");
             }
 
             $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ONLINE);
             $sql = "UPDATE $table set user_ip = '$substitute' WHERE login_user_id = $userId";
             $res = Database::query($sql);
-            if ($res === false && $debug > 0) {
+            if (false === $res && $debug > 0) {
                 error_log("Could not anonymize IP address for user $userId ($sql)");
             }
 
             $table = Database::get_course_table(TABLE_WIKI);
             $sql = "UPDATE $table set user_ip = '$substitute' WHERE user_id = $userId";
             $res = Database::query($sql);
-            if ($res === false && $debug > 0) {
+            if (false === $res && $debug > 0) {
                 error_log("Could not anonymize IP address for user $userId ($sql)");
             }
 
             $table = Database::get_main_table(TABLE_TICKET_MESSAGE);
             $sql = "UPDATE $table set ip_address = '$substitute' WHERE sys_insert_user_id = $userId";
             $res = Database::query($sql);
-            if ($res === false && $debug > 0) {
+            if (false === $res && $debug > 0) {
                 error_log("Could not anonymize IP address for user $userId ($sql)");
             }
 
             $table = Database::get_course_table(TABLE_WIKI);
             $sql = "UPDATE $table set user_ip = '$substitute' WHERE user_id = $userId";
             $res = Database::query($sql);
-            if ($res === false && $debug > 0) {
+            if (false === $res && $debug > 0) {
                 error_log("Could not anonymize IP address for user $userId ($sql)");
             }
         }
@@ -6488,7 +6488,7 @@ SQL;
     {
         $fullName = api_get_person_name($user->getFirstname(), $user->getLastname());
 
-        if ($includeUsername && api_get_setting('profile.hide_username_with_complete_name') === 'false') {
+        if ($includeUsername && 'false' === api_get_setting('profile.hide_username_with_complete_name')) {
             $username = $user->getUsername();
 
             return "$fullName ($username)";
@@ -6530,7 +6530,7 @@ SQL;
             return false;
         }
 
-        if (self::userHasCareer($userId, $careerId) === false) {
+        if (false === self::userHasCareer($userId, $careerId)) {
             $params = ['user_id' => $userId, 'career_id' => $careerId, 'created_at' => api_get_utc_datetime(), 'updated_at' => api_get_utc_datetime()];
             $table = Database::get_main_table(TABLE_MAIN_USER_CAREER);
             Database::insert($table, $params);
@@ -6646,10 +6646,10 @@ SQL;
         $sql = "UPDATE $table_user SET active = '$active' WHERE id = $user_id";
         $r = Database::query($sql);
         $ev = LOG_USER_DISABLE;
-        if ($active == 1) {
+        if (1 == $active) {
             $ev = LOG_USER_ENABLE;
         }
-        if ($r !== false) {
+        if (false !== $r) {
             Event::addEvent($ev, LOG_USER_ID, $user_id);
         }
 
diff --git a/public/main/inc/lib/userportal.lib.php b/public/main/inc/lib/userportal.lib.php
index 354ca90d9a..192ff6a911 100644
--- a/public/main/inc/lib/userportal.lib.php
+++ b/public/main/inc/lib/userportal.lib.php
@@ -514,7 +514,7 @@ class IndexManager
                     if (($user_identified && COURSE_VISIBILITY_OPEN_PLATFORM == $course['visibility']) ||
                         (COURSE_VISIBILITY_OPEN_WORLD == $course['visibility'])
                     ) {
-                        ++$courses_shown;
+                        $courses_shown++;
                         $courses_list_string .= "<li>";
                         $courses_list_string .= '<a href="'.$web_course_path.$course['directory'].'/">'.$course['title'].'</a><br />';
                         $course_details = [];
@@ -541,7 +541,7 @@ class IndexManager
                     // 4. the user is logged in and the user is course admin of te course (regardless of the course visibility setting);
                     // 5. the user is the platform admin api_is_platform_admin().
 
-                    ++$courses_shown;
+                    $courses_shown++;
                     $courses_list_string .= "<li>";
                     if (COURSE_VISIBILITY_OPEN_WORLD == $course['visibility']
                         || ($user_identified && COURSE_VISIBILITY_OPEN_PLATFORM == $course['visibility'])
@@ -1505,7 +1505,7 @@ class IndexManager
                                             $html_courses_session[] = $course_session;
                                         }
                                     }
-                                    ++$count_courses_session;
+                                    $count_courses_session++;
                                 }
                             }
 
@@ -1590,7 +1590,7 @@ class IndexManager
                                     );
                                 }
                                 $listSession[] = $params;
-                                ++$sessionCount;
+                                $sessionCount++;
                             }
                         }
                     } else {
@@ -1674,8 +1674,8 @@ class IndexManager
                                                 $html_courses_session[] = $c[1];
                                             }
                                         }
-                                        ++$count_courses_session;
-                                        ++$count;
+                                        $count_courses_session++;
+                                        $count++;
                                     }
                                 }
 
@@ -1729,7 +1729,7 @@ class IndexManager
                                             $this->tpl->get_template('user_portal/classic_session.tpl')
                                         );
                                     }
-                                    ++$sessionCount;
+                                    $sessionCount++;
                                 }
                             }
                         }
@@ -1913,7 +1913,7 @@ class IndexManager
                     'userCatId' => $userCategoryId,
                     'userCatTitle' => $userCatTitle,
                 ];
-                ++$courseCount;
+                $courseCount++;
             }
             usort($listCoursesInfo, 'self::compareByCourse');
         }
@@ -1973,7 +1973,7 @@ class IndexManager
                                 $coursesInfo
                             );
                             $htmlSession .= '</div>';
-                            ++$sessionCount;
+                            $sessionCount++;
                         }
                         $htmlSession .= ''; // end session block
                         $htmlSessionCategory .= $htmlSession;
@@ -2137,7 +2137,7 @@ class IndexManager
                             $result20 += 10;
                         }
                     } else {
-                        ++$countCoursesPassedNoDependency;
+                        $countCoursesPassedNoDependency++;
                         if ($result80 < 80) {
                             $result80 += 10;
                         }
@@ -2174,7 +2174,7 @@ class IndexManager
                                 true
                             );
                             if ($score) {
-                                ++$countDependenciesPassed;
+                                $countDependenciesPassed++;
                             }
                         }
                     }
diff --git a/public/main/inc/lib/webservices/WebService.class.php b/public/main/inc/lib/webservices/WebService.class.php
index 46727e2e3d..826c475a40 100644
--- a/public/main/inc/lib/webservices/WebService.class.php
+++ b/public/main/inc/lib/webservices/WebService.class.php
@@ -7,8 +7,6 @@ use Chamilo\UserBundle\Entity\User;
  * Base class for Web Services.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.webservices
  */
 class WebService
 {
diff --git a/public/main/inc/lib/zombie/zombie_report.class.php b/public/main/inc/lib/zombie/zombie_report.class.php
index b8f20a3631..915af27cf0 100644
--- a/public/main/inc/lib/zombie/zombie_report.class.php
+++ b/public/main/inc/lib/zombie/zombie_report.class.php
@@ -112,7 +112,7 @@ class ZombieReport implements Countable
     {
         $form = $this->get_parameters_form();
 
-        return $form->isSubmitted() == false || $form->validate();
+        return false == $form->isSubmitted() || $form->validate();
     }
 
     public function get_ceiling($format = null)
@@ -120,7 +120,7 @@ class ZombieReport implements Countable
         $result = Request::get('ceiling');
         $result = $result ? $result : ZombieManager::last_year();
 
-        $result = is_array($result) && count($result) == 1 ? reset($result) : $result;
+        $result = is_array($result) && 1 == count($result) ? reset($result) : $result;
         $result = is_array($result) ? mktime(0, 0, 0, $result['F'], $result['d'], $result['Y']) : $result;
         $result = is_numeric($result) ? (int) $result : $result;
         $result = is_string($result) ? strtotime($result) : $result;
@@ -134,8 +134,8 @@ class ZombieReport implements Countable
     public function get_active_only()
     {
         $result = Request::get('active_only', false);
-        $result = $result === 'true' ? true : $result;
-        $result = $result === 'false' ? false : $result;
+        $result = 'true' === $result ? true : $result;
+        $result = 'false' === $result ? false : $result;
         $result = (bool) $result;
 
         return $result;
@@ -265,7 +265,7 @@ class ZombieReport implements Countable
      */
     public function format_active($active)
     {
-        $active = $active == '1';
+        $active = '1' == $active;
         if ($active) {
             $image = 'accept';
             $text = get_lang('Yes');
diff --git a/public/main/index/user_portal.php b/public/main/index/user_portal.php
index dbd6fd0c14..33dd603ab4 100644
--- a/public/main/index/user_portal.php
+++ b/public/main/index/user_portal.php
@@ -11,8 +11,6 @@ use ChamiloSession as Session;
  * - menu bar
  * Search for CONFIGURATION parameters to modify settings
  *
- * @package chamilo.main
- *
  * @todo Shouldn't the CONFVAL_ constant be moved to the config page? Has anybody any idea what the are used for?
  *       If these are really configuration settings then we can add those to the dokeos config settings.
  * @todo check for duplication of functions with index.php (user_portal.php is orginally a copy of index.php)
@@ -59,9 +57,9 @@ if ($collapsable) {
 
 /* Constants and CONFIGURATION parameters */
 $load_dirs = api_get_setting('show_documents_preview');
-$displayMyCourseViewBySessionLink = api_get_setting('my_courses_view_by_session') === 'true';
+$displayMyCourseViewBySessionLink = 'true' === api_get_setting('my_courses_view_by_session');
 $nameTools = get_lang('My courses');
-$loadHistory = isset($_GET['history']) && intval($_GET['history']) == 1 ? true : false;
+$loadHistory = isset($_GET['history']) && 1 == intval($_GET['history']) ? true : false;
 
 // Load course notification by ajax
 $loadNotificationsByAjax = api_get_configuration_value('user_portal_load_notification_by_ajax');
@@ -156,7 +154,7 @@ $controller = new IndexManager(get_lang('My courses'));
 if (!$myCourseListAsCategory) {
     // Main courses and session list
     if (isset($_COOKIE['defaultMyCourseView'.$userId]) &&
-        $_COOKIE['defaultMyCourseView'.$userId] == IndexManager::VIEW_BY_SESSION &&
+        IndexManager::VIEW_BY_SESSION == $_COOKIE['defaultMyCourseView'.$userId] &&
         $displayMyCourseViewBySessionLink
     ) {
         $courseAndSessions = $controller->returnCoursesAndSessionsViewBySession($userId);
@@ -211,18 +209,18 @@ if (!$myCourseListAsCategory) {
 }
 
 // Check if a user is enrolled only in one course for going directly to the course after the login.
-if (api_get_setting('go_to_course_after_login') === 'true') {
+if ('true' === api_get_setting('go_to_course_after_login')) {
     $count_of_sessions = $courseAndSessions['session_count'];
     $count_of_courses_no_sessions = $courseAndSessions['course_count'];
     // User is subscribe in 1 session and 0 courses.
-    if ($count_of_sessions == 1 && $count_of_courses_no_sessions == 0) {
+    if (1 == $count_of_sessions && 0 == $count_of_courses_no_sessions) {
         $sessions = SessionManager::get_sessions_by_user($userId);
 
         if (isset($sessions[0])) {
             $sessionInfo = $sessions[0];
             // Session only has 1 course.
             if (isset($sessionInfo['courses']) &&
-                count($sessionInfo['courses']) == 1
+                1 == count($sessionInfo['courses'])
             ) {
                 $courseCode = $sessionInfo['courses'][0]['code'];
                 $courseInfo = api_get_course_info_by_id($sessionInfo['courses'][0]['real_id']);
@@ -243,8 +241,8 @@ if (api_get_setting('go_to_course_after_login') === 'true') {
 
     // User is subscribed to 1 course.
     if (!isset($_SESSION['coursesAlreadyVisited']) &&
-        $count_of_sessions == 0 &&
-        $count_of_courses_no_sessions == 1
+        0 == $count_of_sessions &&
+        1 == $count_of_courses_no_sessions
     ) {
         $courses = CourseManager::get_courses_list_by_user_id($userId);
         if (!empty($courses) && isset($courses[0]) && isset($courses[0]['code'])) {
@@ -269,7 +267,7 @@ $controller->tpl->assign('content', $courseAndSessions['html']);
 
 // Display the Site Use Cookie Warning Validation
 $useCookieValidation = api_get_setting('cookie_warning');
-if ($useCookieValidation === 'true') {
+if ('true' === $useCookieValidation) {
     if (isset($_POST['acceptCookies'])) {
         api_set_site_use_cookie_warning_cookie();
     } else {
diff --git a/public/main/index/whoisonline.php b/public/main/index/whoisonline.php
index 1c566f51ac..64ab26135e 100644
--- a/public/main/index/whoisonline.php
+++ b/public/main/index/whoisonline.php
@@ -39,7 +39,7 @@ if (isset($_GET['cidReq']) && strlen($_GET['cidReq']) > 0) {
 
 if ($user_list) {
     if (!isset($_GET['id'])) {
-        if (api_get_setting('allow_social_tool') == 'true') {
+        if ('true' == api_get_setting('allow_social_tool')) {
             if (!api_is_anonymous()) {
                 $query = isset($_GET['q']) ? $_GET['q'] : null;
                 $social_search = UserManager::getSearchForm($query);
@@ -52,7 +52,7 @@ if ($user_list) {
 $whoisonline_list .= SocialManager::display_user_list($user_list);
 
 if (isset($_GET['id'])) {
-    if (api_get_setting('allow_social_tool') == 'true' && api_user_is_login()) {
+    if ('true' == api_get_setting('allow_social_tool') && api_user_is_login()) {
         header("Location: ".api_get_path(WEB_CODE_PATH)."social/profile.php?u=".intval($_GET['id']));
         exit;
     }
@@ -60,7 +60,7 @@ if (isset($_GET['id'])) {
 
 $tpl = new Template(get_lang('Online users list'));
 
-if (api_get_setting('allow_social_tool') === 'true' && !api_is_anonymous()) {
+if ('true' === api_get_setting('allow_social_tool') && !api_is_anonymous()) {
     $tpl->assign('whoisonline', $whoisonline_list);
     $tpl->assign('social_search', $social_search);
 } else {
diff --git a/public/main/index/whoisonlinesession.php b/public/main/index/whoisonlinesession.php
index 5dfcf2de1a..37e92b7a7e 100644
--- a/public/main/index/whoisonlinesession.php
+++ b/public/main/index/whoisonlinesession.php
@@ -3,8 +3,6 @@
 
 /**
  * Shows who is online in a specific session.
- *
- * @package chamilo.main
  */
 require_once '../../main/inc/global.inc.php';
 
diff --git a/public/main/install/ajax.php b/public/main/install/ajax.php
index c46552c0cc..5f30bc9224 100644
--- a/public/main/install/ajax.php
+++ b/public/main/install/ajax.php
@@ -4,8 +4,6 @@
 /**
  * Chamilo installation
  * AJAX requests for the installation.
- *
- * @package chamilo.install
  */
 ini_set('display_errors', '1');
 ini_set('log_errors', '1');
@@ -35,7 +33,7 @@ $dbPass = isset($_POST['db_pass']) ? $_POST['db_pass'] : '';
 $dbName = isset($_POST['db_name']) ? $_POST['db_name'] : 'chamilo';
 $installType = isset($_POST['install_type']) ? $_POST['install_type'] : 'new';
 
-if ($installType === 'new') {
+if ('new' === $installType) {
     $dbName = null;
 }
 
diff --git a/public/main/install/index.php b/public/main/install/index.php
index 5efb869808..f3646d0067 100644
--- a/public/main/install/index.php
+++ b/public/main/install/index.php
@@ -196,7 +196,7 @@ if (isset($_POST['step2_install']) || isset($_POST['step2_update_8']) || isset($
     $installType = isset($_GET['installType']) ? $_GET['installType'] : '';
     $updateFromConfigFile = isset($_GET['updateFromConfigFile']) ? $_GET['updateFromConfigFile'] : false;
 }
-if ($installType === 'update' && in_array($my_old_version, $update_from_version_8)) {
+if ('update' === $installType && in_array($my_old_version, $update_from_version_8)) {
     // This is the main configuration file of the system before the upgrade.
     // Old configuration file.
     // Don't change to include_once
@@ -220,7 +220,7 @@ if (!isset($_GET['running'])) {
         $emailForm = $_SERVER['SERVER_ADMIN'];
     }
     $email_parts = explode('@', $emailForm);
-    if (isset($email_parts[1]) && $email_parts[1] == 'localhost') {
+    if (isset($email_parts[1]) && 'localhost' == $email_parts[1]) {
         $emailForm .= '.localdomain';
     }
 
@@ -272,17 +272,17 @@ if (!$_POST) {
 error_log("Step: $current_step");
 
 // Managing the $encryptPassForm
-if ($encryptPassForm == '1') {
+if ('1' == $encryptPassForm) {
     $encryptPassForm = 'bcrypt';
-} elseif ($encryptPassForm == '0') {
+} elseif ('0' == $encryptPassForm) {
     $encryptPassForm = 'none';
 }
 
 $form = '';
 $instalation_type_label = '';
-if ($installType == 'new') {
+if ('new' == $installType) {
     $instalation_type_label = get_lang('New installation');
-} elseif ($installType == 'update') {
+} elseif ('update' == $installType) {
     $update_from_version = isset($update_from_version) ? $update_from_version : null;
     $instalation_type_label = get_lang('Update from Chamilo').(is_array($update_from_version) ? implode('|', $update_from_version) : '');
 }
@@ -354,7 +354,7 @@ if (isset($_POST['step2'])) {
 } elseif (isset($_POST['step4'])) {
     //STEP 5 : CONFIGURATION SETTINGS
     //if update, try getting settings from the database...
-    if ($installType === 'update') {
+    if ('update' === $installType) {
         $db_name = $dbNameForm;
         $database = connectToDatabase(
             $dbHostForm,
@@ -408,9 +408,9 @@ if (isset($_POST['step2'])) {
         // For version 1.9
         $encryptPassForm = get_config_param('password_encryption');
         // Managing the $encryptPassForm
-        if ($encryptPassForm == '1') {
+        if ('1' == $encryptPassForm) {
             $encryptPassForm = 'sha1';
-        } elseif ($encryptPassForm == '0') {
+        } elseif ('0' == $encryptPassForm) {
             $encryptPassForm = 'none';
         }
 
@@ -458,11 +458,11 @@ if (isset($_POST['step2'])) {
     </div>
 
     <?php
-    if ($installType == 'new') {
+    if ('new' == $installType) {
         echo get_lang('Administrator login').' : <strong>'.$loginForm.'</strong><br />';
         echo get_lang('Administrator password (<font color="red">you may want to change this</font>)').' : <strong>'.$passForm.'</strong><br /><br />'; /* TODO: Maybe this password should be hidden too? */
     }
-    $allowSelfRegistrationLiteral = ($allowSelfReg == 'true') ? get_lang('Yes') : ($allowSelfReg == 'approval' ? get_lang('Approval') : get_lang('No'));
+    $allowSelfRegistrationLiteral = ('true' == $allowSelfReg) ? get_lang('Yes') : ('approval' == $allowSelfReg ? get_lang('Approval') : get_lang('No'));
     echo get_lang('Administrator first name').' : '.$adminFirstName, '<br />', get_lang('Administrator last name').' : '.$adminLastName, '<br />';
     echo get_lang('Administrator e-mail').' : '.$emailForm; ?><br />
     <?php echo get_lang('Administrator telephone').' : '.$adminPhoneForm; ?><br />
@@ -481,7 +481,7 @@ if (isset($_POST['step2'])) {
     <?php echo get_lang('URL of this company').' : '.$institutionUrlForm; ?><br />
     <?php echo get_lang('Chamilo URL').' : '.$urlForm; ?><br /><br />
     <?php
-    if ($installType == 'new') {
+    if ('new' == $installType) {
         echo Display::return_message(
             '<h4 style="text-align: center">'.get_lang(
                 'Warning'
@@ -516,7 +516,7 @@ if (isset($_POST['step2'])) {
     //STEP 6 : INSTALLATION PROCESS
     $current_step = 7;
     $msg = get_lang('Installation process execution');
-    if ($installType === 'update') {
+    if ('update' === $installType) {
         $msg = get_lang('Update process execution');
     }
     $form .= '<div class="RequirementHeading">
@@ -533,7 +533,7 @@ if (isset($_POST['step2'])) {
       </div>
       </div>';
 
-    if ($installType === 'update') {
+    if ('update' === $installType) {
         $database = connectToDatabase(
             $dbHostForm,
             $dbUsernameForm,
@@ -642,7 +642,7 @@ if (isset($_POST['step2'])) {
         $result = $command->run($input, new ConsoleOutput());
 
         // No errors
-        if ($result == 0) {
+        if (0 == $result) {
             session_unset();
             $_SESSION = [];
             session_destroy();
diff --git a/public/main/install/install.lib.php b/public/main/install/install.lib.php
index b7fdf70da5..92ac4b4b1e 100644
--- a/public/main/install/install.lib.php
+++ b/public/main/install/install.lib.php
@@ -84,7 +84,7 @@ function checkExtension(
     if (extension_loaded($extensionName)) {
         if (!empty($enabledTerm)) {
             $isEnabled = ini_get($enabledTerm);
-            if ($isEnabled == '1') {
+            if ('1' == $isEnabled) {
                 return Display::label($returnSuccess, 'success');
             } else {
                 if ($optional) {
@@ -141,7 +141,7 @@ function checkPhpSetting(
  */
 function checkPhpSettingExists($phpSetting)
 {
-    if (ini_get($phpSetting) != "") {
+    if ("" != ini_get($phpSetting)) {
         return ini_get($phpSetting);
     }
 
@@ -167,7 +167,7 @@ function getPhpSetting($val)
             break;
     }
 
-    return $value == '1' ? 'ON' : 'OFF';
+    return '1' == $value ? 'ON' : 'OFF';
 }
 
 /**
@@ -268,7 +268,7 @@ function detect_browser_language()
     $system_available_languages = get_language_folder_list();
     $accept_languages = strtolower(str_replace('_', '-', $_SERVER['HTTP_ACCEPT_LANGUAGE']));
     foreach ($language_index as $code => $language) {
-        if (strpos($accept_languages, $code) === 0) {
+        if (0 === strpos($accept_languages, $code)) {
             if (!empty($system_available_languages[$language])) {
                 return $language;
             }
@@ -565,7 +565,7 @@ function get_config_param_from_db($param = '')
 {
     $param = Database::escape_string($param);
 
-    if (($res = Database::query("SELECT * FROM settings_current WHERE variable = '$param'")) !== false) {
+    if (false !== ($res = Database::query("SELECT * FROM settings_current WHERE variable = '$param'"))) {
         if (Database::num_rows($res) > 0) {
             $row = Database::fetch_array($res);
 
@@ -738,7 +738,7 @@ function display_requirements(
 
     foreach ($perms_dir as $perm) {
         $r = @mkdir($dir, $perm);
-        if ($r === true) {
+        if (true === $r) {
             $dir_perm_verified = $perm;
             $course_test_was_created = true;
             break;
@@ -749,11 +749,11 @@ function display_requirements(
     $file_course_test_was_created = false;
     if (is_dir($dir)) {
         foreach ($perms_fil as $perm) {
-            if ($file_course_test_was_created == true) {
+            if (true == $file_course_test_was_created) {
                 break;
             }
             $r = @touch($dir.'/'.$fileToCreate, $perm);
-            if ($r === true) {
+            if (true === $r) {
                 $fil_perm_verified = $perm;
                 $file_course_test_was_created = true;
             }
@@ -768,7 +768,7 @@ function display_requirements(
     echo '<strong>'.get_lang('Please read the following requirements thoroughly.').'</strong><br />';
     echo get_lang('For more details').' <a href="../../documentation/installation_guide.html" target="_blank">'.get_lang('Read the installation guide').'</a>.<br />'."\n";
 
-    if ($installType == 'update') {
+    if ('update' == $installType) {
         echo get_lang('If you plan to upgrade from an older version of Chamilo, you might want to <a href="../../documentation/changelog.html" target="_blank">have a look at the changelog</a> to know what\'s new and what has been changed').'<br />';
     }
     echo '</div>';
@@ -967,7 +967,7 @@ function display_requirements(
 
     echo '</div>';
 
-    if ($installType === 'update' && (empty($updatePath) || $badUpdatePath)) {
+    if ('update' === $installType && (empty($updatePath) || $badUpdatePath)) {
         if ($badUpdatePath) {
             ?>
             <div class="alert alert-warning">
@@ -1010,7 +1010,7 @@ function display_requirements(
             @chmod($checked_writable, $perm);
         }
 
-        if ($course_test_was_created == false) {
+        if (false == $course_test_was_created) {
             $error = true;
         }
 
@@ -1290,14 +1290,14 @@ function displayDatabaseParameter(
     //echo "<tr ".$tr_attribute.">";
     echo "<label class='col-sm-4'>$parameterName</label>";
 
-    if ($installType == INSTALL_TYPE_UPDATE && $displayWhenUpdate) {
+    if (INSTALL_TYPE_UPDATE == $installType && $displayWhenUpdate) {
         echo '<input type="hidden" name="'.$formFieldName.'" id="'.$formFieldName.'" value="'.api_htmlentities($parameterValue).'" />'.$parameterValue;
     } else {
-        $inputType = $formFieldName == 'dbPassForm' ? 'password' : 'text';
+        $inputType = 'dbPassForm' == $formFieldName ? 'password' : 'text';
 
         //Slightly limit the length of the database prefix to avoid having to cut down the databases names later on
-        $maxLength = $formFieldName == 'dbPrefixForm' ? '15' : MAX_FORM_FIELD_LENGTH;
-        if ($installType == INSTALL_TYPE_UPDATE) {
+        $maxLength = 'dbPrefixForm' == $formFieldName ? '15' : MAX_FORM_FIELD_LENGTH;
+        if (INSTALL_TYPE_UPDATE == $installType) {
             echo '<input type="hidden" name="'.$formFieldName.'" id="'.$formFieldName.'" value="'.api_htmlentities($parameterValue).'" />';
             echo api_htmlentities($parameterValue);
         } else {
@@ -1329,7 +1329,7 @@ function display_database_settings_form(
     $dbPortForm = 3306,
     $installationProfile = ''
 ) {
-    if ($installType == 'update') {
+    if ('update' == $installType) {
         global $_configuration;
         $dbHostForm = $_configuration['db_host'];
         $dbUsernameForm = $_configuration['db_user'];
@@ -1351,7 +1351,7 @@ function display_database_settings_form(
         <div class="panel-body">
         <div class="form-group row">
             <label class="col-sm-4"><?php echo get_lang('Database Host'); ?> </label>
-            <?php if ($installType == 'update') {
+            <?php if ('update' == $installType) {
         ?>
             <div class="col-sm-5">
                 <input type="hidden" name="dbHostForm" value="<?php echo htmlentities($dbHostForm); ?>" /><?php echo $dbHostForm; ?>
@@ -1369,7 +1369,7 @@ function display_database_settings_form(
         </div>
         <div class="form-group row">
             <label class="col-sm-4"><?php echo get_lang('Port'); ?> </label>
-            <?php if ($installType == 'update') {
+            <?php if ('update' == $installType) {
         ?>
             <div class="col-sm-5">
                 <input type="hidden" name="dbPortForm" value="<?php echo htmlentities($dbPortForm); ?>" /><?php echo $dbPortForm; ?>
@@ -1400,7 +1400,7 @@ function display_database_settings_form(
         <div class="form-group row">
             <?php
             //Database Name fix replace weird chars
-            if ($installType != INSTALL_TYPE_UPDATE) {
+            if (INSTALL_TYPE_UPDATE != $installType) {
                 $dbNameForm = str_replace(['-', '*', '$', ' ', '.'], '', $dbNameForm);
             }
 
@@ -1414,7 +1414,7 @@ function display_database_settings_form(
                 'id="optional_param1"'
                 ); ?>
         </div>
-       <?php if ($installType != INSTALL_TYPE_UPDATE) {
+       <?php if (INSTALL_TYPE_UPDATE != $installType) {
                     ?>
         <div class="form-group row">
             <div class="col-sm-4"></div>
@@ -1434,7 +1434,7 @@ function display_database_settings_form(
         $database_exists_text = '';
     $manager = null;
     try {
-        if ($installType === 'update') {
+        if ('update' === $installType) {
             /** @var \Database $manager */
             $manager = connectToDatabase(
                 $dbHostForm,
@@ -1459,7 +1459,7 @@ function display_database_settings_form(
                 $sql = "ALTER TABLE $table ADD COLUMN name2 varchar(140) ";
                 $connection->query($sql);
                 $schemaManager->dropTable($table);
-                $tableDropWorks = $schemaManager->tablesExist($table) === false;
+                $tableDropWorks = false === $schemaManager->tablesExist($table);
             }
         } else {
             $manager = connectToDatabase(
@@ -1488,7 +1488,7 @@ function display_database_settings_form(
             Database port: <strong><?php echo $manager->getConnection()->getPort(); ?></strong><br/>
             Database driver: <strong><?php echo $manager->getConnection()->getDriver()->getName(); ?></strong><br/>
             <?php
-                if ($installType === 'update') {
+                if ('update' === $installType) {
                     echo get_lang('CreateTableWorks').' <strong>Ok</strong>';
                     echo '<br/ >';
                     echo get_lang('AlterTableWorks').' <strong>Ok</strong>';
@@ -1568,7 +1568,7 @@ function display_configuration_parameter(
 ) {
     $html = '<div class="form-group row">';
     $html .= '<label class="col-sm-6 control-label">'.$parameterName.'</label>';
-    if ($installType == INSTALL_TYPE_UPDATE && $displayWhenUpdate) {
+    if (INSTALL_TYPE_UPDATE == $installType && $displayWhenUpdate) {
         $html .= '<input type="hidden" name="'.$formFieldName.'" value="'.api_htmlentities($parameterValue, ENT_QUOTES).'" />'.$parameterValue;
     } else {
         $html .= '<div class="col-sm-6"><input class="form-control" type="text" size="'.FORM_FIELD_DISPLAY_LENGTH.'" maxlength="'.MAX_FORM_FIELD_LENGTH.'" name="'.$formFieldName.'" value="'.api_htmlentities($parameterValue, ENT_QUOTES).'" />'."</div>";
@@ -1614,7 +1614,7 @@ function display_configuration_settings_form(
     $loginForm,
     $passForm
 ) {
-    if ($installType != 'update' && empty($languageForm)) {
+    if ('update' != $installType && empty($languageForm)) {
         $languageForm = $_SESSION['install_language'];
     }
     echo '<div class="RequirementHeading">';
@@ -1628,11 +1628,11 @@ function display_configuration_settings_form(
         get_lang('Administrator login'),
         'loginForm',
         $loginForm,
-        $installType == 'update'
+        'update' == $installType
     );
 
     // Parameter 2: administrator's password
-    if ($installType != 'update') {
+    if ('update' != $installType) {
         $html .= display_configuration_parameter($installType, get_lang('Administrator password (<font color="red">you may want to change this</font>)'), 'passForm', $passForm, false);
     }
 
@@ -1656,7 +1656,7 @@ function display_configuration_settings_form(
     //First parameter: language
     $html = '<div class="form-group row">';
     $html .= '<label class="col-sm-6 control-label">'.get_lang('Main language')."</label>";
-    if ($installType == 'update') {
+    if ('update' == $installType) {
         $html .= '<input type="hidden" name="languageForm" value="'.api_htmlentities($languageForm, ENT_QUOTES).'" />'.$languageForm;
     } else { // new installation
         $html .= '<div class="col-sm-6">';
@@ -1669,7 +1669,7 @@ function display_configuration_settings_form(
     $html .= '<div class="form-group row">';
     $html .= '<label class="col-sm-6 control-label">'.get_lang('Chamilo URL').get_lang('Required field').'</label>';
 
-    if ($installType == 'update') {
+    if ('update' == $installType) {
         $html .= api_htmlentities($urlForm, ENT_QUOTES)."\n";
     } else {
         $html .= '<div class="col-sm-6">';
@@ -1705,24 +1705,24 @@ function display_configuration_settings_form(
     $html .= '<div class="form-group row">
             <label class="col-sm-6 control-label">'.get_lang("Encryption method").'</label>
         <div class="col-sm-6">';
-    if ($installType == 'update') {
+    if ('update' == $installType) {
         $html .= '<input type="hidden" name="encryptPassForm" value="'.$encryptPassForm.'" />'.$encryptPassForm;
     } else {
         $html .= '<div class="checkbox">
                     <label>
-                        <input  type="radio" name="encryptPassForm" value="bcrypt" id="encryptPass1" '.($encryptPassForm == 'bcrypt' ? 'checked="checked" ' : '').'/> bcrypt
+                        <input  type="radio" name="encryptPassForm" value="bcrypt" id="encryptPass1" '.('bcrypt' == $encryptPassForm ? 'checked="checked" ' : '').'/> bcrypt
                     </label>';
 
         $html .= '<label>
-                        <input  type="radio" name="encryptPassForm" value="sha1" id="encryptPass1" '.($encryptPassForm == 'sha1' ? 'checked="checked" ' : '').'/> sha1
+                        <input  type="radio" name="encryptPassForm" value="sha1" id="encryptPass1" '.('sha1' == $encryptPassForm ? 'checked="checked" ' : '').'/> sha1
                     </label>';
 
         $html .= '<label>
-                        <input type="radio" name="encryptPassForm" value="md5" id="encryptPass0" '.($encryptPassForm == 'md5' ? 'checked="checked" ' : '').'/> md5
+                        <input type="radio" name="encryptPassForm" value="md5" id="encryptPass0" '.('md5' == $encryptPassForm ? 'checked="checked" ' : '').'/> md5
                     </label>';
 
         $html .= '<label>
-                        <input type="radio" name="encryptPassForm" value="none" id="encryptPass2" '.($encryptPassForm == 'none' ? 'checked="checked" ' : '').'/>'.get_lang('none').'
+                        <input type="radio" name="encryptPassForm" value="none" id="encryptPass2" '.('none' == $encryptPassForm ? 'checked="checked" ' : '').'/>'.get_lang('none').'
                     </label>';
         $html .= '</div>';
     }
@@ -1731,10 +1731,10 @@ function display_configuration_settings_form(
     $html .= '<div class="form-group row">
             <label class="col-sm-6 control-label">'.get_lang('Allow self-registration').'</label>
             <div class="col-sm-6">';
-    if ($installType == 'update') {
-        if ($allowSelfReg == 'true') {
+    if ('update' == $installType) {
+        if ('true' == $allowSelfReg) {
             $label = get_lang('Yes');
-        } elseif ($allowSelfReg == 'false') {
+        } elseif ('false' == $allowSelfReg) {
             $label = get_lang('No');
         } else {
             $label = get_lang('After approval');
@@ -1743,13 +1743,13 @@ function display_configuration_settings_form(
     } else {
         $html .= '<div class="control-group">';
         $html .= '<label class="checkbox-inline">
-                        <input type="radio" name="allowSelfReg" value="true" id="allowSelfReg1" '.($allowSelfReg == 'true' ? 'checked="checked" ' : '').' /> '.get_lang('Yes').'
+                        <input type="radio" name="allowSelfReg" value="true" id="allowSelfReg1" '.('true' == $allowSelfReg ? 'checked="checked" ' : '').' /> '.get_lang('Yes').'
                     </label>';
         $html .= '<label class="checkbox-inline">
-                        <input type="radio" name="allowSelfReg" value="false" id="allowSelfReg0" '.($allowSelfReg == 'false' ? '' : 'checked="checked" ').' /> '.get_lang('No').'
+                        <input type="radio" name="allowSelfReg" value="false" id="allowSelfReg0" '.('false' == $allowSelfReg ? '' : 'checked="checked" ').' /> '.get_lang('No').'
                     </label>';
         $html .= '<label class="checkbox-inline">
-                    <input type="radio" name="allowSelfReg" value="approval" id="allowSelfReg2" '.($allowSelfReg == 'approval' ? '' : 'checked="checked" ').' /> '.get_lang('After approval').'
+                    <input type="radio" name="allowSelfReg" value="approval" id="allowSelfReg2" '.('approval' == $allowSelfReg ? '' : 'checked="checked" ').' /> '.get_lang('After approval').'
                 </label>';
         $html .= '</div>';
     }
@@ -1759,8 +1759,8 @@ function display_configuration_settings_form(
     $html .= '<div class="form-group row">';
     $html .= '<label class="col-sm-6 control-label">'.get_lang('Allow self-registrationProf').'</label>
         <div class="col-sm-6">';
-    if ($installType == 'update') {
-        if ($allowSelfRegProf == 'true') {
+    if ('update' == $installType) {
+        if ('true' == $allowSelfRegProf) {
             $label = get_lang('Yes');
         } else {
             $label = get_lang('No');
@@ -2582,7 +2582,7 @@ function fixIds(EntityManager $em)
                             'item_id' => $value[$handlerId],
                         ];
                         $connection->insert('extra_field_values', $params);
-                        if ($debug && ($k % 10000 == 0)) {
+                        if ($debug && (0 == $k % 10000)) {
                             error_log("Saving field $k");
                         }
                         $k++;
@@ -2708,7 +2708,7 @@ function fixLpId($connection, $debug)
                         }
                     }
 
-                    if ($item['item_type'] == 'document' && !empty($item['path'])) {
+                    if ('document' == $item['item_type'] && !empty($item['path'])) {
                         $oldDocumentId = $item['path'];
                         $sql = "SELECT * FROM c_document WHERE c_id = $courseId AND id = $oldDocumentId";
                         $result = $connection->query($sql);
@@ -2982,7 +2982,7 @@ function installPages($container)
     $blockInteractor = $container->get('sonata.page.block_interactor');
     $parentBlock = null;
     foreach ($containers as $id => $area) {
-        if (false === $area['block'] && $templateContainers[$id]['shared'] === false) {
+        if (false === $area['block'] && false === $templateContainers[$id]['shared']) {
             $block = $blockInteractor->createNewContainer(
                 [
                     'page' => $pageWelcome,
@@ -2991,7 +2991,7 @@ function installPages($container)
                 ]
             );
 
-            if ($id === 'content' && $templateContainers[$id]['name'] == 'Main content') {
+            if ('content' === $id && 'Main content' == $templateContainers[$id]['name']) {
                 $parentBlock = $block;
             }
         }
@@ -3183,7 +3183,7 @@ function finishInstallationWithContainer(
             ->setProject($ticketProject)
             ->setInsertUserId(1);
 
-        $isRequired = $i == 6;
+        $isRequired = 6 == $i;
         $ticketCategory->setCourseRequired($isRequired);
 
         $manager->persist($ticketCategory);
@@ -3402,7 +3402,7 @@ function installProfileSettings($installationProfile = '')
     }
     $json = file_get_contents($jsonPath);
     $params = json_decode($json);
-    if ($params === false or $params === null) {
+    if (false === $params or null === $params) {
         return false;
     }
     $settings = $params->params;
@@ -3439,8 +3439,8 @@ function rrmdir($dir)
     if (is_dir($dir)) {
         $objects = scandir($dir);
         foreach ($objects as $object) {
-            if ($object != "." && $object != "..") {
-                if (filetype($dir."/".$object) == "dir") {
+            if ("." != $object && ".." != $object) {
+                if ("dir" == filetype($dir."/".$object)) {
                     @rrmdir($dir."/".$object);
                 } else {
                     @unlink($dir."/".$object);
@@ -3494,7 +3494,7 @@ function get_group_picture_path_by_id($id, $type = 'web', $preview = false, $ano
     $user = Database::fetch_array($res);
     $picture_filename = trim($user['picture_uri']);
 
-    if (api_get_setting('split_users_upload_directory') === 'true') {
+    if ('true' === api_get_setting('split_users_upload_directory')) {
         if (!empty($picture_filename)) {
             $dir = $base.'groups/'.substr($picture_filename, 0, 1).'/'.$id.'/';
         } elseif ($preview) {
diff --git a/public/main/install/install_files.inc.php b/public/main/install/install_files.inc.php
index cb3bd9b2bd..c5eed147ff 100644
--- a/public/main/install/install_files.inc.php
+++ b/public/main/install/install_files.inc.php
@@ -10,8 +10,6 @@
  *   such as the database names.
  * - .htaccess file (in the courses directory) that is optional but improves
  *   security
- *
- * @package chamilo.install
  */
 if (defined('SYSTEM_INSTALLATION')) {
     // Write the system config file
diff --git a/public/main/install/update-configuration.inc.php b/public/main/install/update-configuration.inc.php
index 806ffe62fa..db209ef8db 100644
--- a/public/main/install/update-configuration.inc.php
+++ b/public/main/install/update-configuration.inc.php
@@ -5,8 +5,6 @@
  * Chamilo LMS.
  *
  * Only updates the  main/inc/conf/configuration.php
- *
- * @package chamilo.install
  */
 if (defined('SYSTEM_INSTALLATION')) {
     error_log("Starting ".basename(__FILE__));
@@ -27,21 +25,21 @@ if (defined('SYSTEM_INSTALLATION')) {
 
     foreach ($file as $line) {
         $ignore = false;
-        if (stripos($line, '$_configuration[\'system_version\']') !== false) {
+        if (false !== stripos($line, '$_configuration[\'system_version\']')) {
             $found_version = true;
             $line = '$_configuration[\'system_version\'] = \''.$GLOBALS['new_version'].'\';'."\r\n";
-        } elseif (stripos($line, '$_configuration[\'system_stable\']') !== false) {
+        } elseif (false !== stripos($line, '$_configuration[\'system_stable\']')) {
             $found_stable = true;
             $line = '$_configuration[\'system_stable\'] = '.($GLOBALS['new_version_stable'] ? 'true' : 'false').';'."\r\n";
-        } elseif (stripos($line, '$_configuration[\'software_name\']') !== false) {
+        } elseif (false !== stripos($line, '$_configuration[\'software_name\']')) {
             $found_software_name = true;
             $line = '$_configuration[\'software_name\'] = \''.$GLOBALS['software_name'].'\';'."\r\n";
-        } elseif (stripos($line, '$_configuration[\'software_url\']') !== false) {
+        } elseif (false !== stripos($line, '$_configuration[\'software_url\']')) {
             $found_software_url = true;
             $line = '$_configuration[\'software_url\'] = \''.$GLOBALS['software_url'].'\';'."\r\n";
-        } elseif (stripos($line, '$userPasswordCrypted') !== false) {
+        } elseif (false !== stripos($line, '$userPasswordCrypted')) {
             $line = '$_configuration[\'password_encryption\'] = \''.$userPasswordCrypted.'\';'."\r\n";
-        } elseif (stripos($line, '?>') !== false) {
+        } elseif (false !== stripos($line, '?>')) {
             $ignore = true;
         }
         if (!$ignore) {
diff --git a/public/main/install/update-files-1.11.0-2.0.0.inc.php b/public/main/install/update-files-1.11.0-2.0.0.inc.php
index 7a4ceb3ff4..653912b032 100644
--- a/public/main/install/update-files-1.11.0-2.0.0.inc.php
+++ b/public/main/install/update-files-1.11.0-2.0.0.inc.php
@@ -8,8 +8,6 @@
  * This script operates only in the case of an update, and only to change the
  * active version number (and other things that might need a change) in the
  * current configuration file.
- *
- * @package chamilo.install
  */
 error_log("Starting ".basename(__FILE__));
 
diff --git a/public/main/install/version.php b/public/main/install/version.php
index a71e0b933c..cb4b728fb7 100644
--- a/public/main/install/version.php
+++ b/public/main/install/version.php
@@ -6,8 +6,6 @@
  * script should be overwritten with each upgrade of Chamilo. It is not
  * required from any other process of Chamilo than the installation or upgrade.
  * It also helps for automatic packaging of unstable versions.
- *
- * @package chamilo.install
  */
 
 /**
diff --git a/public/main/lp/aicc.class.php b/public/main/lp/aicc.class.php
index 62c0d8711b..bc14b66f43 100644
--- a/public/main/lp/aicc.class.php
+++ b/public/main/lp/aicc.class.php
@@ -337,7 +337,7 @@ class aicc extends learnpath
             }
 
             // Now update previous item to change next_item_id.
-            if ($previous != 0) {
+            if (0 != $previous) {
                 $upd = "UPDATE $new_lp_item SET next_item_id = $item_id WHERE c_id = $course_id AND id = $previous";
                 Database::query($upd);
                 // Update the previous item id.
@@ -529,7 +529,7 @@ class aicc extends learnpath
             }
         }
 
-        if ($package_type == '' || !$mandatory) {
+        if ('' == $package_type || !$mandatory) {
             Display::addFlash(
                 Display::return_message(get_lang('The file to upload is not valid.'))
             );
@@ -546,11 +546,11 @@ class aicc extends learnpath
         }
 
         // It happens on Linux that $new_dir sometimes doesn't start with '/'
-        if ($new_dir[0] != '/') {
+        if ('/' != $new_dir[0]) {
             $new_dir = '/'.$new_dir;
         }
         // Cut trailing slash.
-        if ($new_dir[strlen($new_dir) - 1] == '/') {
+        if ('/' == $new_dir[strlen($new_dir) - 1]) {
             $new_dir = substr($new_dir, 0, -1);
         }
 
@@ -595,7 +595,7 @@ class aicc extends learnpath
             error_log('In aicc::set_proximity('.$proxy.') method', 0);
         }
         $lp = $this->get_id();
-        if ($lp != 0) {
+        if (0 != $lp) {
             $tbl_lp = Database::get_course_table(TABLE_LP_MAIN);
             $sql = "UPDATE $tbl_lp SET content_local = '$proxy' WHERE c_id = ".$course_id." id = ".$lp;
             Database::query($sql);
@@ -620,7 +620,7 @@ class aicc extends learnpath
             error_log('In aicc::set_theme('.$theme.') method', 0);
         }
         $lp = $this->get_id();
-        if ($lp != 0) {
+        if (0 != $lp) {
             $tbl_lp = Database::get_course_table(TABLE_LP_MAIN);
             $sql = "UPDATE $tbl_lp SET theme = '$theme' WHERE c_id = ".$course_id." id = ".$lp;
             $res = Database::query($sql);
@@ -645,7 +645,7 @@ class aicc extends learnpath
             error_log('In aicc::set_preview_image('.$preview_image.') method', 0);
         }
         $lp = $this->get_id();
-        if ($lp != 0) {
+        if (0 != $lp) {
             $tbl_lp = Database::get_course_table(TABLE_LP_MAIN);
             $sql = "UPDATE $tbl_lp SET preview_image = '$preview_image' 
                     WHERE c_id = ".$course_id." id = ".$lp;
@@ -668,7 +668,7 @@ class aicc extends learnpath
     {
         $course_id = api_get_course_int_id();
         $lp = $this->get_id();
-        if ($lp != 0) {
+        if (0 != $lp) {
             $tbl_lp = Database::get_course_table(TABLE_LP_MAIN);
             $sql = "UPDATE $tbl_lp SET author = '$author' 
                     WHERE c_id = ".$course_id." id = ".$lp;
@@ -694,7 +694,7 @@ class aicc extends learnpath
             error_log('In aicc::set_maker method('.$maker.')', 0);
         }
         $lp = $this->get_id();
-        if ($lp != 0) {
+        if (0 != $lp) {
             $tbl_lp = Database::get_course_table(TABLE_LP_MAIN);
             $sql = "UPDATE $tbl_lp SET content_maker = '$maker' 
                     WHERE c_id = ".$course_id." id = ".$lp;
@@ -824,7 +824,7 @@ class aicc extends learnpath
         $title = '';
         if (isset($this->config['organizations']['default'])) {
             $title = $this->organizations[$this->config['organizations']['default']]->get_name();
-        } elseif (count($this->organizations) == 1) {
+        } elseif (1 == count($this->organizations)) {
             // This will only get one title but so we don't need to know the index.
             foreach ($this->organizations as $id => $value) {
                 $title = $this->organizations[$id]->get_name();
@@ -872,13 +872,13 @@ class aicc extends learnpath
         for ($i = 0; $i < @count($f); $i++) {
             $newsec = 0;
             $w = @trim($f[$i]);
-            if (substr($w, 0, 1) == ';') {
+            if (';' == substr($w, 0, 1)) {
                 // Ignore comment lines
                 continue;
             }
             if ($w) {
                 if ((!$r) or ($sec)) {
-                    if ((@substr($w, 0, 1) == '[') and (@substr($w, -1, 1)) == ']') {
+                    if (('[' == @substr($w, 0, 1)) and ']' == (@substr($w, -1, 1))) {
                         $sec = @substr($w, 1, @strlen($w) - 2);
                         $newsec = 1;
                     }
@@ -888,11 +888,11 @@ class aicc extends learnpath
                     $k = @trim($w[0]);
                     unset($w[0]);
                     $v = @trim(@implode('=', $w));
-                    if ((@substr($v, 0, 1) == "\"") and (@substr($v, -1, 1) == "\"")) {
+                    if (("\"" == @substr($v, 0, 1)) and ("\"" == @substr($v, -1, 1))) {
                         $v = @substr($v, 1, @strlen($v) - 2);
                     }
                     if ($sec) {
-                        if (api_strtolower($sec) == 'course_description') { // A special case.
+                        if ('course_description' == api_strtolower($sec)) { // A special case.
                             $r[api_strtolower($sec)] = $k;
                         } else {
                             $r[api_strtolower($sec)][api_strtolower($k)] = $v;
@@ -928,13 +928,13 @@ class aicc extends learnpath
         for ($i = 0; $i < @count($f); $i++) {
             $newsec = 0;
             $w = @trim($f[$i]);
-            if (substr($w, 0, 1) == ';') {
+            if (';' == substr($w, 0, 1)) {
                 // Ignore comment lines
                 continue;
             }
             if ($w) {
                 if ((!$r) or ($sec)) {
-                    if ((@substr($w, 0, 1) == '[') and (@substr($w, -1, 1)) == ']') {
+                    if (('[' == @substr($w, 0, 1)) and ']' == (@substr($w, -1, 1))) {
                         $sec = @substr($w, 1, @strlen($w) - 2);
                         $pure_data = 0;
                         if (in_array(api_strtolower($sec), $pure_strings)) {
@@ -950,14 +950,14 @@ class aicc extends learnpath
                     $k = @trim($w[0]);
                     unset($w[0]);
                     $v = @trim(@implode('=', $w));
-                    if ((@substr($v, 0, 1) == "\"") and (@substr($v, -1, 1) == "\"")) {
+                    if (("\"" == @substr($v, 0, 1)) and ("\"" == @substr($v, -1, 1))) {
                         $v = @substr($v, 1, @strlen($v) - 2);
                     }
                     if ($sec) {
                         if ($pure_data) {
                             $r[api_strtolower($sec)] .= $f[$i];
                         } else {
-                            if (api_strtolower($sec) == 'course_description') { // A special case.
+                            if ('course_description' == api_strtolower($sec)) { // A special case.
                                 $r[api_strtolower($sec)] = $k;
                             } else {
                                 $r[api_strtolower($sec)][api_strtolower($k)] = $v;
@@ -1012,7 +1012,7 @@ class aicc extends learnpath
                     }
                     break;
                 case "\r":
-                    if (!$enclosed && $data[$i + 1] == "\n") {
+                    if (!$enclosed && "\n" == $data[$i + 1]) {
                         break;
                     }
                     // no break
@@ -1026,7 +1026,7 @@ class aicc extends learnpath
                     }
                     break;
                 case "\\r":
-                    if (!$enclosed && $data[$i + 1] == "\\n") {
+                    if (!$enclosed && "\\n" == $data[$i + 1]) {
                         break;
                     }
                     // no break
@@ -1050,7 +1050,7 @@ class aicc extends learnpath
         $titles = [];
         $ret_ret_array = [];
         foreach ($ret_array as $line_idx => $line) {
-            if ($line_idx == 0) {
+            if (0 == $line_idx) {
                 $titles = $line;
             } else {
                 $ret_ret_array[$line_idx] = [];
diff --git a/public/main/lp/aiccBlock.class.php b/public/main/lp/aiccBlock.class.php
index bd3c3800ef..90fd07f9df 100644
--- a/public/main/lp/aiccBlock.class.php
+++ b/public/main/lp/aiccBlock.class.php
@@ -7,8 +7,6 @@
  *
  * Container for the aiccResource class that deals with elemens from AICC Course Structure file
  *
- * @package chamilo.learnpath
- *
  * @author  Yannick Warnier <ywarnier@beeznest.org>
  * @license GNU/GPL
  */
@@ -39,7 +37,7 @@ class aiccBlock extends learnpathItem
                                 $this->identifier = strtolower($value);
                                 break;
                             case 'member':
-                                if (strstr($value, ',') !== false) {
+                                if (false !== strstr($value, ',')) {
                                     $temp = explode(',', $value);
                                     foreach ($temp as $val) {
                                         if (!empty($val)) {
diff --git a/public/main/lp/aiccItem.class.php b/public/main/lp/aiccItem.class.php
index cfbd077a27..1be1141a0a 100644
--- a/public/main/lp/aiccItem.class.php
+++ b/public/main/lp/aiccItem.class.php
@@ -6,12 +6,8 @@
  * This class handles the elements from an AICC Descriptor file.
  * Container for the aiccItem class that deals with AICC Assignable Units (AUs).
  *
- * @package chamilo.learnpath
- *
  * @author  Yannick Warnier    <ywarnier@beeznest.org>
  * @license GNU/GPL
- *
- * @package chamilo.learnpath
  */
 class aiccItem extends learnpathItem
 {
diff --git a/public/main/lp/aiccObjective.class.php b/public/main/lp/aiccObjective.class.php
index 26cc1b80b9..aab1dd6bea 100644
--- a/public/main/lp/aiccObjective.class.php
+++ b/public/main/lp/aiccObjective.class.php
@@ -6,8 +6,6 @@
  * Class defining the Block elements in an AICC Course Structure file.
  * Container for the aiccResource class that deals with elemens from AICC Objectives file.
  *
- * @package chamilo.learnpath
- *
  * @author  Yannick Warnier <ywarnier@beeznest.org>
  * @license GNU/GPL
  */
@@ -38,7 +36,7 @@ class aiccObjective extends learnpathItem
                                 $this->identifier = strtolower($value);
                                 break;
                             case 'member':
-                                if (strstr($value, ',') !== false) {
+                                if (false !== strstr($value, ',')) {
                                     $temp = explode(',', $value);
                                     foreach ($temp as $val) {
                                         if (!empty($val)) {
diff --git a/public/main/lp/aiccResource.class.php b/public/main/lp/aiccResource.class.php
index 0ab74d624e..dcf513aa9b 100644
--- a/public/main/lp/aiccResource.class.php
+++ b/public/main/lp/aiccResource.class.php
@@ -5,8 +5,6 @@
  * Class defining the elements from an AICC Descriptor file.
  * Container for the aiccResource class that deals with elemens from AICC Descriptor file.
  *
- * @package chamilo.learnpath
- *
  * @author  Yannick Warnier <ywarnier@beeznest.org>
  * @license GNU/GPL
  */
diff --git a/public/main/lp/aicc_api.php b/public/main/lp/aicc_api.php
index 052e96f702..3c32acf241 100644
--- a/public/main/lp/aicc_api.php
+++ b/public/main/lp/aicc_api.php
@@ -11,8 +11,6 @@ use ChamiloSession as Session;
  *
  * @version  v 1.0
  *
- * @package  chamilo.learnpath
- *
  * @license    GNU/GPL
  */
 
@@ -259,7 +257,7 @@ function LMSSetValue(param, val) {
     case 'cmi.core.lesson_status'	:
         saved_lesson_status = lesson_status;
         lesson_status = val;
-        <?php if ($oLP->mode != 'fullscreen') {
+        <?php if ('fullscreen' != $oLP->mode) {
               ?>
         //var update = update_toc(lesson_status,lms_item_id);
         <?php
@@ -274,7 +272,7 @@ function LMSSetValue(param, val) {
     //var update = update_toc();
     //var update_progress = update_progress_bar();
     <?php
-    if ($oLP->force_commit == 1) {
+    if (1 == $oLP->force_commit) {
         echo "	var mycommit = LMSCommit('force');";
     }
     ?>
@@ -492,7 +490,7 @@ function logit_lms(message,priority) {
  */
 function update_toc(update_action,update_id)
 {
-    <?php if ($oLP->mode != 'fullscreen') {
+    <?php if ('fullscreen' != $oLP->mode) {
     ?>
         var myframe = frames["toc_name"];
         var myelem = myframe.document.getElementById("toc_"+update_id);
diff --git a/public/main/lp/aicc_hacp.php b/public/main/lp/aicc_hacp.php
index 4eb9239ebd..fd5133d502 100644
--- a/public/main/lp/aicc_hacp.php
+++ b/public/main/lp/aicc_hacp.php
@@ -11,8 +11,6 @@ use ChamiloSession as Session;
  *
  * @version  v 1.0
  *
- * @package  chamilo.learnpath
- *
  * @license    GNU/GPL
  */
 
@@ -200,7 +198,7 @@ if (!empty($_REQUEST['command'])) {
                                     $oItem->set_score($value);
                                     break;
                                 case 'time':
-                                    if (strpos($value, ':') !== false) {
+                                    if (false !== strpos($value, ':')) {
                                         $oItem->set_time($value, 'scorm');
                                     } else {
                                         $oItem->set_time($value);
diff --git a/public/main/lp/blank.php b/public/main/lp/blank.php
index dfd2ef1d31..f35f53bf90 100644
--- a/public/main/lp/blank.php
+++ b/public/main/lp/blank.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * Script that displays a blank page (with later a message saying why).
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 // Flag to allow for anonymous user - needs to be set before global.inc.php.
@@ -58,7 +56,7 @@ if (isset($_GET['error'])) {
         default:
             break;
     }
-} elseif (isset($_GET['msg']) && $_GET['msg'] == 'exerciseFinished') {
+} elseif (isset($_GET['msg']) && 'exerciseFinished' == $_GET['msg']) {
     $message = Display::return_message(get_lang('Test Finished'));
 }
 
diff --git a/public/main/lp/content_makers.inc.php b/public/main/lp/content_makers.inc.php
index c4fd45e241..2319b05968 100644
--- a/public/main/lp/content_makers.inc.php
+++ b/public/main/lp/content_makers.inc.php
@@ -4,8 +4,6 @@
 /**
  * The only usage of this script is to have a portable way of keeping the list of content makers.
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <yannick.warnier@beeznest.com>
  */
 $content_origins = [
diff --git a/public/main/lp/download.php b/public/main/lp/download.php
index eedb69b6ef..a9921ad593 100644
--- a/public/main/lp/download.php
+++ b/public/main/lp/download.php
@@ -5,8 +5,6 @@ use ChamiloSession as Session;
 
 /**
  * This file is responsible for  passing requested documents to the browser.
- *
- * @package chamilo.document
  */
 session_cache_limiter('none');
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/lp/index.php b/public/main/lp/index.php
index c3c00e11bf..0ff390dd87 100644
--- a/public/main/lp/index.php
+++ b/public/main/lp/index.php
@@ -3,8 +3,6 @@
 /**
  * Redirection script.
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 
diff --git a/public/main/lp/learnpath.class.php b/public/main/lp/learnpath.class.php
index 28dd40c6bd..93a56a27d7 100644
--- a/public/main/lp/learnpath.class.php
+++ b/public/main/lp/learnpath.class.php
@@ -30,6 +30,7 @@ use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
  *
  * @todo decouple class
  * *
+ *
  * @author  Yannick Warnier <ywarnier@beeznest.org>
  * @author  Julio Montoya   <gugli100@gmail.com> Several improvements and fixes
  */
@@ -168,8 +169,8 @@ class learnpath
                 if (!empty($entity->getExpiredOn())) {
                     $this->expired_on = $entity->getExpiredOn()->format('Y-m-d H:i:s');
                 }
-                if ($this->type == 2) {
-                    if ($entity->getForceCommit() == 1) {
+                if (2 == $this->type) {
+                    if (1 == $entity->getForceCommit()) {
                         $this->force_commit = true;
                     }
                 }
@@ -321,7 +322,7 @@ class learnpath
                     // Setting the view in the item object.
                     if (is_object($this->items[$row['iid']])) {
                         $this->items[$row['iid']]->set_lp_view($this->lp_view_id, $course_id);
-                        if ($this->items[$row['iid']]->get_type() == TOOL_HOTPOTATOES) {
+                        if (TOOL_HOTPOTATOES == $this->items[$row['iid']]->get_type()) {
                             $this->items[$row['iid']]->current_start_time = 0;
                             $this->items[$row['iid']]->current_stop_time = 0;
                         }
@@ -548,7 +549,7 @@ class learnpath
         $id = (int) $id;
         $typeCleaned = Database::escape_string($type);
         $max_score = 100;
-        if ($type === 'quiz') {
+        if ('quiz' === $type) {
             $sql = 'SELECT SUM(ponderation)
                     FROM '.Database::get_course_table(TABLE_QUIZ_QUESTION).' as quiz_question
                     INNER JOIN '.Database::get_course_table(TABLE_QUIZ_TEST_QUESTION).' as quiz_rel_question
@@ -588,7 +589,7 @@ class learnpath
             'launch_data' => '',
         ];
 
-        if ($prerequisites != 0) {
+        if (0 != $prerequisites) {
             $params['prerequisite'] = $prerequisites;
         }
 
@@ -1026,7 +1027,7 @@ class learnpath
 
         //self::toggle_publish($this->lp_id, 'i');
 
-        if ($this->type == 2 || $this->type == 3) {
+        if (2 == $this->type || 3 == $this->type) {
             // This is a scorm learning path, delete the files as well.
             $sql = "SELECT path FROM $lp
                     WHERE iid = ".$this->lp_id;
@@ -1050,12 +1051,12 @@ class learnpath
                     $course_rel_dir = api_get_course_path().'/scorm/'; // scorm dir web path starting from /courses
                     // The absolute system path for this course.
                     $course_scorm_dir = api_get_path(SYS_COURSE_PATH).$course_rel_dir;
-                    if ($delete == 'remove' && is_dir($course_scorm_dir.$path) && !empty($course_scorm_dir)) {
+                    if ('remove' == $delete && is_dir($course_scorm_dir.$path) && !empty($course_scorm_dir)) {
                         if ($this->debug > 2) {
                             error_log('In learnpath::delete(), found SCORM, deleting directory: '.$course_scorm_dir.$path, 0);
                         }
                         // Proposed by Christophe (clefevre).
-                        if (strcmp(substr($path, -2), "/.") == 0) {
+                        if (0 == strcmp(substr($path, -2), "/.")) {
                             $path = substr($path, 0, -1); // Remove "." at the end.
                         }
                         //exec('rm -rf ' . $course_scorm_dir . $path); // See Bug #5208, this is not OS-portable way.
@@ -1098,11 +1099,11 @@ class learnpath
             api_get_session_id()
         );
 
-        if ($link_info !== false) {
+        if (false !== $link_info) {
             GradebookUtils::remove_resource_from_course_gradebook($link_info['id']);
         }
 
-        if (api_get_setting('search_enabled') == 'true') {
+        if ('true' == api_get_setting('search_enabled')) {
             require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
             delete_all_values_for_item($this->cc, TOOL_LEARNPATH, $this->lp_id);
         }
@@ -1201,7 +1202,7 @@ class learnpath
         Database::query($sql);
 
         // Remove from search engine if enabled.
-        if (api_get_setting('search_enabled') === 'true') {
+        if ('true' === api_get_setting('search_enabled')) {
             $tbl_se_ref = Database::get_main_table(TABLE_MAIN_SEARCH_ENGINE_REF);
             $sql = 'SELECT * FROM %s
                     WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=%s AND ref_id_second_level=%d
@@ -1265,7 +1266,7 @@ class learnpath
         $res_select = Database::query($sql);
         $row_select = Database::fetch_array($res_select);
         $audio_update_sql = '';
-        if (is_array($audio) && !empty($audio['tmp_name']) && $audio['error'] === 0) {
+        if (is_array($audio) && !empty($audio['tmp_name']) && 0 === $audio['error']) {
             // Create the audio folder if it does not exist yet.
             $filepath = api_get_path(SYS_COURSE_PATH).$_course['path'].'/document/';
             if (!is_dir($filepath.'audio')) {
@@ -1281,7 +1282,7 @@ class learnpath
 
             // Upload file in documents.
             $pi = pathinfo($audio['name']);
-            if ($pi['extension'] === 'mp3') {
+            if ('mp3' === $pi['extension']) {
                 $c_det = api_get_course_info($this->cc);
                 $bp = api_get_path(SYS_COURSE_PATH).$c_det['path'].'/document';
                 $path = handle_uploaded_document(
@@ -1327,7 +1328,7 @@ class learnpath
 
             /* BEGIN -- virtually remove the current item id */
             /* for the next and previous item it is like the current item doesn't exist anymore */
-            if ($old_previous != 0) {
+            if (0 != $old_previous) {
                 // Next
                 $sql = "UPDATE $tbl_lp_item
                         SET next_item_id = $old_next
@@ -1356,7 +1357,7 @@ class learnpath
             /* END -- virtually remove the current item id */
 
             /* BEGIN -- update the current item id to his new location */
-            if ($previous == 0) {
+            if (0 == $previous) {
                 // Select the data of the item that should come after the current item.
                 $sql = "SELECT id, display_order
                         FROM $tbl_lp_item
@@ -1369,7 +1370,7 @@ class learnpath
                 $row_select_old = Database::fetch_array($res_select_old);
 
                 // If the new parent didn't have children before.
-                if (Database::num_rows($res_select_old) == 0) {
+                if (0 == Database::num_rows($res_select_old)) {
                     $new_next = 0;
                     $new_order = 1;
                 } else {
@@ -1401,7 +1402,7 @@ class learnpath
                     WHERE iid = $id";
             Database::query($sql);
 
-            if ($previous != 0) {
+            if (0 != $previous) {
                 // Update the previous item's next_item_id.
                 $sql = "UPDATE $tbl_lp_item
                         SET next_item_id = $id
@@ -1444,7 +1445,7 @@ class learnpath
             Database::query($sql);
         }
 
-        if ($row_select['item_type'] == 'link') {
+        if ('link' == $row_select['item_type']) {
             $link = new Link();
             $linkId = $row_select['path'];
             $link->updateLink($linkId, $url);
@@ -1554,7 +1555,7 @@ class learnpath
         foreach ($this->items as $id => $dummy) {
             // Trying failed and browsed considered "progressed" as well.
             if ($this->items[$id]->status_is($completedStatusList) &&
-                $this->items[$id]->get_type() != 'dir'
+                'dir' != $this->items[$id]->get_type()
             ) {
                 $i++;
             }
@@ -1632,13 +1633,13 @@ class learnpath
         }
 
         // Test if the last_item_seen exists and is not a dir.
-        if (count($this->ordered_items) == 0) {
+        if (0 == count($this->ordered_items)) {
             $this->index = 0;
         }
 
         if (!empty($this->last_item_seen) &&
             !empty($this->items[$this->last_item_seen]) &&
-            $this->items[$this->last_item_seen]->get_type() != 'dir'
+            'dir' != $this->items[$this->last_item_seen]->get_type()
             //with this change (below) the LP will NOT go to the next item, it will take lp item we left
             //&& !$this->items[$this->last_item_seen]->is_done()
         ) {
@@ -1655,7 +1656,7 @@ class learnpath
                     break;
                 }
             }
-            if ($index == -1) {
+            if (-1 == $index) {
                 // Index hasn't changed, so item not found - panic (this shouldn't happen).
                 if ($this->debug > 2) {
                     error_log('Last item ('.$this->last_item_seen.') was found in items but not in ordered_items, panic!', 0);
@@ -1677,8 +1678,8 @@ class learnpath
             while (!empty($this->ordered_items[$index]) &&
                 is_a($this->items[$this->ordered_items[$index]], 'learnpathItem') &&
                 (
-                    $this->items[$this->ordered_items[$index]]->get_type() == 'dir' ||
-                    $this->items[$this->ordered_items[$index]]->is_done() === true
+                    'dir' == $this->items[$this->ordered_items[$index]]->get_type() ||
+                    true === $this->items[$this->ordered_items[$index]]->is_done()
                 ) && $index < $this->max_ordered_items) {
                 $index++;
             }
@@ -1799,7 +1800,7 @@ class learnpath
 
         if (!empty($display)) {
             $showReporting = isset($display['show_reporting_icon']) ? $display['show_reporting_icon'] : true;
-            if ($showReporting === false) {
+            if (false === $showReporting) {
                 $reportingIcon = '';
             }
         }
@@ -1811,7 +1812,7 @@ class learnpath
 
         $previousIcon = '';
         $nextIcon = '';
-        if ($hideArrows === false) {
+        if (false === $hideArrows) {
             $previousIcon = '
                 <a class="icon-toolbar" id="scorm-previous" href="#"
                     onclick="switch_item('.$mycurrentitemid.',\'previous\');return false;" title="'.$previousText.'">
@@ -1825,7 +1826,7 @@ class learnpath
                 </a>';
         }
 
-        if ($this->mode === 'fullscreen') {
+        if ('fullscreen' === $this->mode) {
             $navbar = '
                   <span id="'.$barId.'" class="buttons">
                     '.$reportingIcon.'
@@ -1859,12 +1860,12 @@ class learnpath
         $index = $this->index;
         $index++;
         while (
-            !empty($this->ordered_items[$index]) && ($this->items[$this->ordered_items[$index]]->get_type() == 'dir') &&
+            !empty($this->ordered_items[$index]) && ('dir' == $this->items[$this->ordered_items[$index]]->get_type()) &&
             $index < $this->max_ordered_items
         ) {
             $index++;
             if ($index == $this->max_ordered_items) {
-                if ($this->items[$this->ordered_items[$index]]->get_type() == 'dir') {
+                if ('dir' == $this->items[$this->ordered_items[$index]]->get_type()) {
                     return $this->index;
                 }
 
@@ -1940,7 +1941,7 @@ class learnpath
             foreach ($zipContentArray as $thisContent) {
                 if (preg_match('~.(php.*|phtml)$~i', $thisContent['filename'])) {
                     // New behaviour: Don't do anything. These files will be removed in scorm::import_package.
-                } elseif (stristr($thisContent['filename'], 'imsmanifest.xml') !== false) {
+                } elseif (false !== stristr($thisContent['filename'], 'imsmanifest.xml')) {
                     $manifest = $thisContent['filename']; // Just the relative directory inside scorm/
                     $package_type = 'scorm';
                     break; // Exit the foreach loop.
@@ -1999,7 +2000,7 @@ class learnpath
         if (isset($this->ordered_items[$index - 1])) {
             $index--;
             while (isset($this->ordered_items[$index]) &&
-                ($this->items[$this->ordered_items[$index]]->get_type() == 'dir')
+                ('dir' == $this->items[$this->ordered_items[$index]]->get_type())
             ) {
                 $index--;
                 if ($index < 0) {
@@ -2075,8 +2076,8 @@ class learnpath
                     }
 
                     if ($type_quiz) {
-                        if ($_SESSION['oLP']->prevent_reinit == 1) {
-                            $autostart_audio = $row['status'] === 'completed' ? 'false' : 'true';
+                        if (1 == $_SESSION['oLP']->prevent_reinit) {
+                            $autostart_audio = 'completed' === $row['status'] ? 'false' : 'true';
                         } else {
                             $autostart_audio = $autostart;
                         }
@@ -2238,7 +2239,7 @@ class learnpath
 
         $visibility = $lp->isVisible($courseInfo['entity'], api_get_session_entity($sessionId));
         // If the item was deleted.
-        if ($visibility === false) {
+        if (false === $visibility) {
             return false;
         }
 
@@ -2257,7 +2258,7 @@ class learnpath
             if (!empty($row['category_id'])) {
                 $em = Database::getManager();
                 $category = $em->getRepository('ChamiloCourseBundle:CLpCategory')->find($row['category_id']);
-                if (self::categoryIsVisibleForStudent($category, api_get_user_entity($student_id)) === false) {
+                if (false === self::categoryIsVisibleForStudent($category, api_get_user_entity($student_id))) {
                     return false;
                 }
             }
@@ -2305,8 +2306,8 @@ class learnpath
                 $subscriptionSettings = self::getSubscriptionSettings();
 
                 // Check if the subscription users/group to a LP is ON
-                if (isset($row['subscribe_users']) && $row['subscribe_users'] == 1 &&
-                    $subscriptionSettings['allow_add_users_to_lp'] === true
+                if (isset($row['subscribe_users']) && 1 == $row['subscribe_users'] &&
+                    true === $subscriptionSettings['allow_add_users_to_lp']
                 ) {
                     // Try group
                     $is_visible = false;
@@ -2320,7 +2321,7 @@ class learnpath
                         'LearnpathSubscription'
                     );
 
-                    if ($userVisibility == 1) {
+                    if (1 == $userVisibility) {
                         $is_visible = true;
                     } else {
                         $userGroups = GroupManager::getAllGroupPerUserSubscription($student_id, $courseId);
@@ -2337,7 +2338,7 @@ class learnpath
                                     $groupId
                                 );
 
-                                if ($userVisibility == 1) {
+                                if (1 == $userVisibility) {
                                     $is_visible = true;
                                     break;
                                 }
@@ -2481,7 +2482,7 @@ class learnpath
         }
         $total_items = $this->getTotalItemsCountWithoutDirs();
         $completeItems = $this->get_complete_items_count();
-        if ($add != 0) {
+        if (0 != $add) {
             $completeItems += $add;
         }
         $text = '';
@@ -2489,13 +2490,13 @@ class learnpath
             $completeItems = $total_items;
         }
         $percentage = 0;
-        if ($mode == '%') {
+        if ('%' == $mode) {
             if ($total_items > 0) {
                 $percentage = ((float) $completeItems / (float) $total_items) * 100;
             }
             $percentage = number_format($percentage, 0);
             $text = '%';
-        } elseif ($mode === 'abs') {
+        } elseif ('abs' === $mode) {
             $percentage = $completeItems;
             $text = '/'.$total_items;
         }
@@ -2580,14 +2581,14 @@ class learnpath
                 $image_custom_size = $info['filename'].'.'.$size.'.'.$info['extension'];
 
                 if (file_exists($image_sys_path.$image_custom_size)) {
-                    if ($path_type == 'web') {
+                    if ('web' == $path_type) {
                         return $image_path.$image_custom_size;
                     } else {
                         return $image_sys_path.$image_custom_size;
                     }
                 }
             } else {
-                if ($path_type == 'web') {
+                if ('web' == $path_type) {
                     return $image_path.$preview_image;
                 } else {
                     return $image_sys_path.$preview_image;
@@ -2722,7 +2723,7 @@ class learnpath
     {
         for ($i = 0; $i < $children->length; $i++) {
             $item_temp = $children->item($i);
-            if ($item_temp->nodeName == 'item') {
+            if ('item' == $item_temp->nodeName) {
                 if ($item_temp->getAttribute('identifier') == $id) {
                     return $item_temp;
                 }
@@ -3002,7 +3003,7 @@ class learnpath
         $sql = "SELECT lp_type FROM $tbl_lp
                 WHERE iid = $lp_id";
         $res = Database::query($sql);
-        if ($res === false) {
+        if (false === $res) {
             return null;
         }
         if (Database::num_rows($res) <= 0) {
@@ -3102,7 +3103,7 @@ class learnpath
                 }
                 $listParent[] = $subtree;
             }
-            if (!in_array($subtree['type'], $dirTypes) && $subtree['parent'] == null) {
+            if (!in_array($subtree['type'], $dirTypes) && null == $subtree['parent']) {
                 $classStatus = [
                     'not attempted' => 'scorm_not_attempted',
                     'incomplete' => 'scorm_not_attempted',
@@ -3308,7 +3309,7 @@ class learnpath
         $isAllow = api_is_allowed_to_edit(null, true, false, false);
         $hideIcons = api_get_configuration_value('hide_teacher_icons_lp');
         $html = '';
-        if ($isAllow && $hideIcons == false) {
+        if ($isAllow && false == $hideIcons) {
             if ($this->get_lp_session_id() == api_get_session_id()) {
                 $html .= '<div id="actions_lp" class="actions_lp"><hr>';
                 $html .= '<div class="btn-group">';
@@ -3414,11 +3415,11 @@ class learnpath
             $lp_item_path = $row['lipath'];
             $lp_item_params = $row['liparams'];
 
-            if (empty($lp_item_params) && strpos($lp_item_path, '?') !== false) {
+            if (empty($lp_item_params) && false !== strpos($lp_item_path, '?')) {
                 list($lp_item_path, $lp_item_params) = explode('?', $lp_item_path);
             }
             //$sys_course_path = api_get_path(SYS_COURSE_PATH).api_get_course_path();
-            if ($type === 'http') {
+            if ('http' === $type) {
                 //web path
                 //$course_path = api_get_path(WEB_COURSE_PATH).api_get_course_path();
             } else {
@@ -3490,9 +3491,9 @@ class learnpath
                                 $urlId = api_get_current_access_url_id();
                                 $url = api_get_access_url($urlId, false);
                                 $protocol = substr($url['url'], 0, 5);
-                                if ($protocol === 'https') {
+                                if ('https' === $protocol) {
                                     $linkProtocol = substr($file, 0, 5);
-                                    if ($linkProtocol === 'http:') {
+                                    if ('http:' === $linkProtocol) {
                                         //this is the special intervention case
                                         $file = api_get_path(WEB_CODE_PATH).'lp/embed.php?type=nonhttps&source='.urlencode($file);
                                     }
@@ -3523,7 +3524,7 @@ class learnpath
 
                             $type_quiz = false;
                             foreach ($list as $toc) {
-                                if ($toc['id'] == $lp_item_id && $toc['type'] == 'quiz') {
+                                if ($toc['id'] == $lp_item_id && 'quiz' == $toc['type']) {
                                     $type_quiz = true;
                                 }
                             }
@@ -3541,7 +3542,7 @@ class learnpath
                                 $row_count = Database:: fetch_row($result);
                                 $count_item_view = (int) $row_count[0];
                                 $not_multiple_attempt = 0;
-                                if ($prevent_reinit === 1 && $count_item_view > 0) {
+                                if (1 === $prevent_reinit && $count_item_view > 0) {
                                     $not_multiple_attempt = 1;
                                 }
                                 $file .= '&not_multiple_attempt='.$not_multiple_attempt;
@@ -3560,7 +3561,7 @@ class learnpath
                         error_log('In learnpath::get_link() '.__LINE__.' - Item type: '.$lp_item_type, 0);
                     }
 
-                    if ($lp_item_type != 'dir') {
+                    if ('dir' != $lp_item_type) {
                         // Quite complex here:
                         // We want to make sure 'http://' (and similar) links can
                         // be loaded as is (withouth the Chamilo path in front) but
@@ -3568,7 +3569,7 @@ class learnpath
                         // which means we have to find a protocol at the path's start, otherwise
                         // it should not be considered as an external URL.
                         // if ($this->prerequisites_match($item_id)) {
-                        if (preg_match('#^[a-zA-Z]{2,5}://#', $lp_item_path) != 0) {
+                        if (0 != preg_match('#^[a-zA-Z]{2,5}://#', $lp_item_path)) {
                             if ($this->debug > 2) {
                                 error_log('In learnpath::get_link() '.__LINE__.' - Found match for protocol in '.$lp_item_path, 0);
                             }
@@ -3586,7 +3587,7 @@ class learnpath
                             // TODO: Fix this for urls with protocol header.
                             $file = str_replace('//', '/', $file);
                             $file = str_replace(':/', '://', $file);
-                            if (substr($lp_path, -1) == '/') {
+                            if ('/' == substr($lp_path, -1)) {
                                 $lp_path = substr($lp_path, 0, -1);
                             }
 
@@ -3619,9 +3620,9 @@ class learnpath
                         }
 
                         // We want to use parameters if they were defined in the imsmanifest
-                        if (strpos($file, 'blank.php') === false) {
+                        if (false === strpos($file, 'blank.php')) {
                             $lp_item_params = ltrim($lp_item_params, '?');
-                            $file .= (strstr($file, '?') === false ? '?' : '').$lp_item_params;
+                            $file .= (false === strstr($file, '?') ? '?' : '').$lp_item_params;
                         }
                     } else {
                         $file = 'lp_content.php?type=dir';
@@ -3636,14 +3637,14 @@ class learnpath
                     if (!empty($lp_item_params)) {
                         $aicc_append .= $lp_item_params.'&';
                     }
-                    if ($lp_item_type != 'dir') {
+                    if ('dir' != $lp_item_type) {
                         // Quite complex here:
                         // We want to make sure 'http://' (and similar) links can
                         // be loaded as is (withouth the Chamilo path in front) but
                         // some contents use this form: resource.htm?resource=http://blablabla
                         // which means we have to find a protocol at the path's start, otherwise
                         // it should not be considered as an external URL.
-                        if (preg_match('#^[a-zA-Z]{2,5}://#', $lp_item_path) != 0) {
+                        if (0 != preg_match('#^[a-zA-Z]{2,5}://#', $lp_item_path)) {
                             if ($this->debug > 2) {
                                 error_log('In learnpath::get_link() '.__LINE__.' - Found match for protocol in '.$lp_item_path, 0);
                             }
@@ -3655,7 +3656,7 @@ class learnpath
                                 $file = str_replace('<servername>', $course_path.'/scorm/'.$lp_path.'/', $lp_item_path);
                             }
                             */
-                            if (stripos($file, '<servername>') !== false) {
+                            if (false !== stripos($file, '<servername>')) {
                                 //$file = str_replace('<servername>',$course_path.'/scorm/'.$lp_path.'/',$lp_item_path);
                                 $web_course_path = str_replace('https://', '', str_replace('http://', '', $course_path));
                                 $file = str_replace('<servername>', $web_course_path.'/scorm/'.$lp_path, $lp_item_path);
@@ -3706,7 +3707,7 @@ class learnpath
     {
         $search = '';
         // Use $attempt_num to enable multi-views management (disabled so far).
-        if ($attempt_num != 0 && intval(strval($attempt_num)) == $attempt_num) {
+        if (0 != $attempt_num && intval(strval($attempt_num)) == $attempt_num) {
             $search = 'AND view_count = '.$attempt_num;
         }
         // When missing $attempt_num, search for a unique lp_view record for this lp and user.
@@ -3844,14 +3845,14 @@ class learnpath
                     $row2 = Database::fetch_array($res_sel2);
                     $previous_previous = $row2['previous_item_id'];
                     // Update previous_previous item (switch "next" with current).
-                    if ($previous_previous != 0) {
+                    if (0 != $previous_previous) {
                         $sql_upd2 = "UPDATE $tbl_lp_item SET
                                         next_item_id = $id
                                     WHERE iid = $previous_previous";
                         Database::query($sql_upd2);
                     }
                     // Update previous item (switch with current).
-                    if ($previous != 0) {
+                    if (0 != $previous) {
                         $sql_upd2 = "UPDATE $tbl_lp_item SET
                                     next_item_id = $next,
                                     previous_item_id = $id,
@@ -3861,7 +3862,7 @@ class learnpath
                     }
 
                     // Update current item (switch with previous).
-                    if ($id != 0) {
+                    if (0 != $id) {
                         $sql_upd2 = "UPDATE $tbl_lp_item SET
                                         next_item_id = $previous,
                                         previous_item_id = $previous_previous,
@@ -3879,7 +3880,7 @@ class learnpath
                 }
                 break;
             case 'down':
-                if ($next != 0) {
+                if (0 != $next) {
                     $sql_sel2 = "SELECT * FROM $tbl_lp_item
                                  WHERE iid = $next";
                     $res_sel2 = Database::query($sql_sel2);
@@ -3890,14 +3891,14 @@ class learnpath
                     $row2 = Database::fetch_array($res_sel2);
                     $next_next = $row2['next_item_id'];
                     // Update previous item (switch with current).
-                    if ($previous != 0) {
+                    if (0 != $previous) {
                         $sql_upd2 = "UPDATE $tbl_lp_item
                                      SET next_item_id = $next
                                      WHERE iid = $previous";
                         Database::query($sql_upd2);
                     }
                     // Update current item (switch with previous).
-                    if ($id != 0) {
+                    if (0 != $id) {
                         $sql_upd2 = "UPDATE $tbl_lp_item SET
                                      previous_item_id = $next,
                                      next_item_id = $next_next,
@@ -3907,7 +3908,7 @@ class learnpath
                     }
 
                     // Update next item (new previous item).
-                    if ($next != 0) {
+                    if (0 != $next) {
                         $sql_upd2 = "UPDATE $tbl_lp_item SET
                                      previous_item_id = $previous,
                                      next_item_id = $id,
@@ -3917,7 +3918,7 @@ class learnpath
                     }
 
                     // Update next_next item (switch "previous" with current).
-                    if ($next_next != 0) {
+                    if (0 != $next_next) {
                         $sql_upd2 = "UPDATE $tbl_lp_item SET
                                      previous_item_id = $id
                                      WHERE iid = $next_next";
@@ -3956,7 +3957,7 @@ class learnpath
                 $categoryCondition
                 ORDER BY display_order";
         $res = Database::query($sql);
-        if ($res === false) {
+        if (false === $res) {
             return false;
         }
 
@@ -4018,7 +4019,7 @@ class learnpath
                 $categoryCondition
                 ORDER BY display_order";
         $res = Database::query($sql);
-        if ($res === false) {
+        if (false === $res) {
             return false;
         }
         $lps = [];
@@ -4141,7 +4142,7 @@ class learnpath
         $currentItem = $this->getItem($itemId);
 
         if ($currentItem) {
-            if ($this->type == 2) {
+            if (2 == $this->type) {
                 // Getting prereq from scorm
                 $prereq_string = $this->get_scorm_prereq_string($itemId);
             } else {
@@ -4170,7 +4171,7 @@ class learnpath
                 $this->get_user_id()
             );
 
-            if ($result === false) {
+            if (false === $result) {
                 $this->set_error_msg($currentItem->prereq_alert);
             }
         } else {
@@ -4217,7 +4218,7 @@ class learnpath
     public static function toggle_visibility($lp_id, $set_visibility = 1)
     {
         $action = 'visible';
-        if ($set_visibility != 1) {
+        if (1 != $set_visibility) {
             $action = 'invisible';
             self::toggle_publish($lp_id, 'i');
         }
@@ -4248,7 +4249,7 @@ class learnpath
     public static function toggleCategoryVisibility($id, $visibility = 1)
     {
         $action = 'visible';
-        if ($visibility != 1) {
+        if (1 != $visibility) {
             self::toggleCategoryPublish($id, 0);
             $action = 'invisible';
         }
@@ -4275,7 +4276,7 @@ class learnpath
     public static function toggle_publish($id, $setVisibility = 'v')
     {
         $addShortcut = false;
-        if ($setVisibility === 'v') {
+        if ('v' === $setVisibility) {
             $addShortcut = true;
         }
         $repo = Container::getLpRepository();
@@ -4439,14 +4440,14 @@ class learnpath
             ])
             ->getOneOrNullResult();
 
-        if ($setVisibility == 0 && $tool) {
+        if (0 == $setVisibility && $tool) {
             $em->remove($tool);
             $em->flush();
 
             return true;
         }
 
-        if ($setVisibility == 1 && !$tool) {
+        if (1 == $setVisibility && !$tool) {
             $tool = new CTool();
             $tool
                 ->setCategory('authoring')
@@ -4472,7 +4473,7 @@ class learnpath
             return true;
         }
 
-        if ($setVisibility == 1 && $tool) {
+        if (1 == $setVisibility && $tool) {
             $tool
                 ->setName(strip_tags($category->getName()))
                 ->setVisibility(1);
@@ -4522,13 +4523,13 @@ class learnpath
             $sessionId
         );
 
-        if ($categoryVisibility !== 1 && $categoryVisibility != -1) {
+        if (1 !== $categoryVisibility && -1 != $categoryVisibility) {
             return false;
         }
 
         $subscriptionSettings = self::getSubscriptionSettings();
 
-        if ($subscriptionSettings['allow_add_users_to_lp_category'] == false) {
+        if (false == $subscriptionSettings['allow_add_users_to_lp_category']) {
             return true;
         }
 
@@ -4556,7 +4557,7 @@ class learnpath
                 $session = $em->getRepository('ChamiloCoreBundle:Session')->find($sessionId);
             }
 
-            if ($courseId != 0) {
+            if (0 != $courseId) {
                 $course = $courseRepo->find($courseId);
 
                 // Subscribed groups to a LP
@@ -4875,7 +4876,7 @@ class learnpath
         }
         if (api_is_encoding_supported($enc)) {
             $lp = $this->get_id();
-            if ($lp != 0) {
+            if (0 != $lp) {
                 $tbl_lp = Database::get_course_table(TABLE_LP_MAIN);
                 $sql = "UPDATE $tbl_lp SET default_encoding = '$enc'
                         WHERE iid = ".$lp;
@@ -4900,7 +4901,7 @@ class learnpath
     {
         $lp = $this->get_id();
 
-        if ($lp != 0) {
+        if (0 != $lp) {
             $tbl_lp = Database::get_course_table(TABLE_LP_MAIN);
             $lib = Database::escape_string($lib);
             $sql = "UPDATE $tbl_lp SET js_lib = '$lib'
@@ -4993,7 +4994,7 @@ class learnpath
     public function set_terms_by_prefix($terms_string, $prefix)
     {
         $course_id = api_get_course_int_id();
-        if (api_get_setting('search_enabled') !== 'true') {
+        if ('true' !== api_get_setting('search_enabled')) {
             return false;
         }
 
@@ -5007,7 +5008,7 @@ class learnpath
         $stored_terms = $this->get_common_index_terms_by_prefix($prefix);
 
         // Don't do anything if no change, verify only at DB, not the search engine.
-        if ((count(array_diff($terms, $stored_terms)) == 0) && (count(array_diff($stored_terms, $terms)) == 0)) {
+        if ((0 == count(array_diff($terms, $stored_terms))) && (0 == count(array_diff($stored_terms, $terms)))) {
             return false;
         }
 
@@ -5336,12 +5337,12 @@ class learnpath
             error_log('In learnpath::start_current_item()');
             error_log('current: '.$this->current);
         }
-        if ($this->current != 0 && isset($this->items[$this->current]) && is_object($this->items[$this->current])) {
+        if (0 != $this->current && isset($this->items[$this->current]) && is_object($this->items[$this->current])) {
             $type = $this->get_type();
             $item_type = $this->items[$this->current]->get_type();
-            if (($type == 2 && $item_type != 'sco') ||
-                ($type == 3 && $item_type != 'au') ||
-                ($type == 1 && $item_type != TOOL_QUIZ && $item_type != TOOL_HOTPOTATOES)
+            if ((2 == $type && 'sco' != $item_type) ||
+                (3 == $type && 'au' != $item_type) ||
+                (1 == $type && TOOL_QUIZ != $item_type && TOOL_HOTPOTATOES != $item_type)
             ) {
                 if ($debug) {
                     error_log('item type: '.$item_type);
@@ -5356,7 +5357,7 @@ class learnpath
                 $this->items[$this->current]->save(false, $prereq_check);
             }
             // If sco, then it is supposed to have been updated by some other call.
-            if ($item_type == 'sco') {
+            if ('sco' == $item_type) {
                 $this->items[$this->current]->restart();
             }
         }
@@ -5383,7 +5384,7 @@ class learnpath
             error_log('In learnpath::stop_previous_item()', 0);
         }
 
-        if ($this->last != 0 && $this->last != $this->current &&
+        if (0 != $this->last && $this->last != $this->current &&
             isset($this->items[$this->last]) && is_object($this->items[$this->last])
         ) {
             if ($debug) {
@@ -5391,7 +5392,7 @@ class learnpath
             }
             switch ($this->get_type()) {
                 case '3':
-                    if ($this->items[$this->last]->get_type() != 'au') {
+                    if ('au' != $this->items[$this->last]->get_type()) {
                         if ($debug) {
                             error_log('In learnpath::stop_previous_item() - '.$this->last.' in lp_type 3 is <> au');
                         }
@@ -5403,7 +5404,7 @@ class learnpath
                     }
                     break;
                 case '2':
-                    if ($this->items[$this->last]->get_type() != 'sco') {
+                    if ('sco' != $this->items[$this->last]->get_type()) {
                         if ($debug) {
                             error_log('In learnpath::stop_previous_item() - '.$this->last.' in lp_type 2 is <> sco');
                         }
@@ -5487,10 +5488,10 @@ class learnpath
         if (Database::num_rows($res) > 0) {
             $row = Database::fetch_array($res);
             $force = $row['force_commit'];
-            if ($force == 1) {
+            if (1 == $force) {
                 $force = 0;
                 $force_return = false;
-            } elseif ($force == 0) {
+            } elseif (0 == $force) {
                 $force = 1;
                 $force_return = true;
             }
@@ -5518,7 +5519,7 @@ class learnpath
                 WHERE c_id = $course_id
                 ORDER BY display_order";
         $res = Database::query($sql);
-        if ($res === false) {
+        if (false === $res) {
             return false;
         }
 
@@ -5555,9 +5556,9 @@ class learnpath
         if (Database::num_rows($res) > 0) {
             $row = Database::fetch_array($res);
             $force = $row['prevent_reinit'];
-            if ($force == 1) {
+            if (1 == $force) {
                 $force = 0;
-            } elseif ($force == 0) {
+            } elseif (0 == $force) {
                 $force = 1;
             }
             $sql = "UPDATE $lp_table SET prevent_reinit = $force
@@ -5588,13 +5589,13 @@ class learnpath
         if (!isset($this->prevent_reinit)) {
             $this->prevent_reinit = 1;
         }
-        if ($this->seriousgame_mode == 1 && $this->prevent_reinit == 1) {
+        if (1 == $this->seriousgame_mode && 1 == $this->prevent_reinit) {
             return 'seriousgame';
         }
-        if ($this->seriousgame_mode == 0 && $this->prevent_reinit == 1) {
+        if (0 == $this->seriousgame_mode && 1 == $this->prevent_reinit) {
             return 'single';
         }
-        if ($this->seriousgame_mode == 0 && $this->prevent_reinit == 0) {
+        if (0 == $this->seriousgame_mode && 0 == $this->prevent_reinit) {
             return 'multiple';
         }
 
@@ -5685,9 +5686,9 @@ class learnpath
         if (Database::num_rows($res) > 0) {
             $row = Database::fetch_array($res);
             $force = $row['seriousgame_mode'];
-            if ($force == 1) {
+            if (1 == $force) {
                 $force = 0;
-            } elseif ($force == 0) {
+            } elseif (0 == $force) {
                 $force = 1;
             }
             $sql = "UPDATE $lp_table SET seriousgame_mode = $force
@@ -5715,9 +5716,9 @@ class learnpath
         if (Database::num_rows($res) > 0) {
             $row = Database::fetch_array($res);
             $force = $row['debug'];
-            if ($force == 1) {
+            if (1 == $force) {
                 $force = 0;
-            } elseif ($force == 0) {
+            } elseif (0 == $force) {
                 $force = 1;
             }
             $sql = "UPDATE $lp_table SET debug = $force
@@ -5833,11 +5834,11 @@ class learnpath
         $update_audio = isset($_GET['updateaudio']) ? $_GET['updateaudio'] : null;
 
         // we need to start a form when we want to update all the mp3 files
-        if ($update_audio == 'true') {
+        if ('true' == $update_audio) {
             $return .= '<form action="'.api_get_self().'?'.api_get_cidreq().'&updateaudio='.Security::remove_XSS($_GET['updateaudio']).'&action='.Security::remove_XSS($_GET['action']).'&lp_id='.$_SESSION['oLP']->lp_id.'" method="post" enctype="multipart/form-data" name="updatemp3" id="updatemp3">';
         }
         $return .= '<div id="message"></div>';
-        if (count($this->items) == 0) {
+        if (0 == count($this->items)) {
             $return .= Display::return_message(get_lang('You should add some items to your learning path, otherwise you won\'t be able to attach audio files to them'), 'normal');
         } else {
             $return_audio = '<table class="data_table">';
@@ -5846,7 +5847,7 @@ class learnpath
             $return_audio .= '<th>'.get_lang('Audio').'</th>';
             $return_audio .= '</tr>';
 
-            if ($update_audio != 'true') {
+            if ('true' != $update_audio) {
                 $return .= '<div class="col-md-12">';
                 $return .= self::return_new_tree($update_audio);
                 $return .= '</div>';
@@ -5860,7 +5861,7 @@ class learnpath
             }
 
             // We need to close the form when we are updating the mp3 files.
-            if ($update_audio == 'true') {
+            if ('true' == $update_audio) {
                 $return .= '<div class="footer-audio">';
                 $return .= Display::button(
                     'save_audio',
@@ -5872,7 +5873,7 @@ class learnpath
         }
 
         // We need to close the form when we are updating the mp3 files.
-        if ($update_audio == 'true' && isset($this->arrMenu) && count($this->arrMenu) != 0) {
+        if ('true' == $update_audio && isset($this->arrMenu) && 0 != count($this->arrMenu)) {
             $return .= '</form>';
         }
 
@@ -5930,7 +5931,7 @@ class learnpath
 
         $show = api_get_configuration_value('show_full_lp_item_title_in_edition');
 
-        $pluginCalendar = api_get_plugin_setting('learning_calendar', 'enabled') === 'true';
+        $pluginCalendar = 'true' === api_get_plugin_setting('learning_calendar', 'enabled');
         $plugin = null;
         if ($pluginCalendar) {
             $plugin = LearningCalendarPlugin::create();
@@ -5940,11 +5941,11 @@ class learnpath
             $parent_id = $arrLP[$i]['parent_item_id'];
             $title = $arrLP[$i]['title'];
             $title_cut = $arrLP[$i]['title_raw'];
-            if ($show === false) {
+            if (false === $show) {
                 $title_cut = cut($arrLP[$i]['title'], self::MAX_LP_ITEM_TITLE_LENGTH);
             }
             // Link for the documents
-            if ($arrLP[$i]['item_type'] === 'document' || $arrLP[$i]['item_type'] == TOOL_READOUT_TEXT) {
+            if ('document' === $arrLP[$i]['item_type'] || TOOL_READOUT_TEXT == $arrLP[$i]['item_type']) {
                 $url = $mainUrl.'&action=view_item&mode=preview_document&id='.$arrLP[$i]['id'].'&lp_id='.$this->lp_id;
                 $title_cut = Display::url(
                     $title_cut,
@@ -5958,12 +5959,12 @@ class learnpath
             }
 
             // Detect if type is FINAL_ITEM to set path_id to SESSION
-            if ($arrLP[$i]['item_type'] == TOOL_LP_FINAL_ITEM) {
+            if (TOOL_LP_FINAL_ITEM == $arrLP[$i]['item_type']) {
                 Session::write('pathItem', $arrLP[$i]['path']);
             }
 
             $oddClass = 'row_even';
-            if (($i % 2) == 0) {
+            if (0 == ($i % 2)) {
                 $oddClass = 'row_odd';
             }
             $return_audio .= '<tr id ="lp_item_'.$arrLP[$i]['id'].'" class="'.$oddClass.'">';
@@ -5975,7 +5976,7 @@ class learnpath
                 if (file_exists($iconPath.'lp_'.$icon_name.'.gif')) {
                     $icon = Display::return_icon('lp_'.$icon_name.'.gif');
                 } else {
-                    if ($arrLP[$i]['item_type'] === TOOL_LP_FINAL_ITEM) {
+                    if (TOOL_LP_FINAL_ITEM === $arrLP[$i]['item_type']) {
                         $icon = Display::return_icon('certificate.png');
                     } else {
                         $icon = Display::return_icon('folder_document.png');
@@ -5986,7 +5987,7 @@ class learnpath
             // The audio column.
             $return_audio .= '<td align="left" style="padding-left:10px;">';
             $audio = '';
-            if (!$update_audio || $update_audio != 'true') {
+            if (!$update_audio || 'true' != $update_audio) {
                 if (empty($arrLP[$i]['audio'])) {
                     $audio .= '';
                 }
@@ -6021,8 +6022,8 @@ class learnpath
             $pluginUrl = api_get_path(WEB_PLUGIN_PATH).'learning_calendar/start.php?';
 
             if ($is_allowed_to_edit) {
-                if (!$update_audio || $update_audio != 'true') {
-                    if ($arrLP[$i]['item_type'] !== TOOL_LP_FINAL_ITEM) {
+                if (!$update_audio || 'true' != $update_audio) {
+                    if (TOOL_LP_FINAL_ITEM !== $arrLP[$i]['item_type']) {
                         $move_icon .= '<a class="moved" href="#">';
                         $move_icon .= Display::return_icon(
                             'move_everywhere.png',
@@ -6036,7 +6037,7 @@ class learnpath
 
                 // No edit for this item types
                 if (!in_array($arrLP[$i]['item_type'], ['sco', 'asset', 'final_item'])) {
-                    if ($arrLP[$i]['item_type'] != 'dir') {
+                    if ('dir' != $arrLP[$i]['item_type']) {
                         $edit_icon .= '<a href="'.$mainUrl.'&action=edit_item&view=build&id='.$arrLP[$i]['id'].'&lp_id='.$this->lp_id.'&path_item='.$arrLP[$i]['path'].'" class="btn btn-default">';
                         $edit_icon .= Display::return_icon(
                             'edit.png',
@@ -6099,7 +6100,7 @@ class learnpath
                         $edit_icon .= '</a>';
                     }
                 } else {
-                    if ($arrLP[$i]['item_type'] == TOOL_LP_FINAL_ITEM) {
+                    if (TOOL_LP_FINAL_ITEM == $arrLP[$i]['item_type']) {
                         $edit_icon .= '<a href="'.$mainUrl.'&action=edit_item&id='.$arrLP[$i]['id'].'&lp_id='.$this->lp_id.'" class="btn btn-default">';
                         $edit_icon .= Display::return_icon(
                             'edit.png',
@@ -6116,7 +6117,7 @@ class learnpath
                         '&action=toggle_visibility&lp_item_id='.$arrLP[$i]['id'].'&lp_id='.$this->lp_id;
                     $iconCalendar = Display::return_icon('agenda_na.png', get_lang('1 day'), [], ICON_SIZE_TINY);
                     $itemInfo = $plugin->getItemVisibility($arrLP[$i]['id']);
-                    if ($itemInfo && $itemInfo['value'] == 1) {
+                    if ($itemInfo && 1 == $itemInfo['value']) {
                         $iconCalendar = Display::return_icon('agenda.png', get_lang('1 day'), [], ICON_SIZE_TINY);
                     }
                     $pluginCalendarIcon = Display::url(
@@ -6126,7 +6127,7 @@ class learnpath
                     );
                 }
 
-                if ($arrLP[$i]['item_type'] != 'final_item') {
+                if ('final_item' != $arrLP[$i]['item_type']) {
                     $orderIcons = Display::url(
                         $upIcon,
                         'javascript:void(0)',
@@ -6209,7 +6210,7 @@ class learnpath
                         break;
                 }
 
-                if ($arrLP[$i]['item_type'] != 'dir') {
+                if ('dir' != $arrLP[$i]['item_type']) {
                     $prerequisities_icon = Display::url(
                         Display::return_icon(
                             'accept.png',
@@ -6220,7 +6221,7 @@ class learnpath
                         $url.'&action=edit_item_prereq',
                         ['class' => 'btn btn-default']
                     );
-                    if ($arrLP[$i]['item_type'] != 'final_item') {
+                    if ('final_item' != $arrLP[$i]['item_type']) {
                         $move_item_icon = Display::url(
                             Display::return_icon(
                                 'move.png',
@@ -6244,7 +6245,7 @@ class learnpath
                     );
                 }
             }
-            if ($update_audio != 'true') {
+            if ('true' != $update_audio) {
                 $row = $move_icon.' '.$icon.
                     Display::span($title_cut).
                     Display::tag(
@@ -6282,7 +6283,7 @@ class learnpath
                     for ($j = 0; $j < $arrLP[$i]['depth']; $j++) {
                         foreach ($arrLP as $item) {
                             if ($item['id'] == $parent_id) {
-                                if ($item['parent_item_id'] == 0) {
+                                if (0 == $item['parent_item_id']) {
                                     $parent_id = $item['id'];
                                     break;
                                 } else {
@@ -6385,7 +6386,7 @@ class learnpath
             'scorm-list-collapse'
         );
 
-        if ($update_audio === 'true') {
+        if ('true' === $update_audio) {
             $return = $result['return_audio'];
         }
 
@@ -6408,7 +6409,7 @@ class learnpath
                 $item['type'] = $default_content[$item['load_data']]['item_type'];
             }
             $sub_list = '';
-            if (isset($item['type']) && $item['type'] === 'dir') {
+            if (isset($item['type']) && 'dir' === $item['type']) {
                 // empty value
                 $sub_list = Display::tag('li', '', ['class' => 'sub_item empty']);
             }
@@ -6498,7 +6499,7 @@ class learnpath
         $subscriptionSettings = self::getSubscriptionSettings();
 
         $request = api_request_uri();
-        if (strpos($request, 'edit') === false) {
+        if (false === strpos($request, 'edit')) {
             $actionsLeft .= Display::url(
                 Display::return_icon(
                     'settings.png',
@@ -6513,7 +6514,7 @@ class learnpath
             );
         }
 
-        if (strpos($request, 'build') === false && strpos($request, 'add_item') === false) {
+        if (false === strpos($request, 'build') && false === strpos($request, 'add_item')) {
             $actionsLeft .= Display::url(
                 Display::return_icon(
                     'edit.png',
@@ -6528,8 +6529,8 @@ class learnpath
             );
         }
 
-        if (strpos(api_get_self(), 'lp_subscribe_users.php') === false) {
-            if ($this->subscribeUsers == 1 &&
+        if (false === strpos(api_get_self(), 'lp_subscribe_users.php')) {
+            if (1 == $this->subscribeUsers &&
                 $subscriptionSettings['allow_add_users_to_lp']) {
                 $actionsLeft .= Display::url(
                     Display::return_icon(
@@ -6725,11 +6726,11 @@ class learnpath
         $result = $this->generate_lp_folder($courseInfo);
         $dir = $result['dir'];
 
-        if (empty($parentId) || $parentId == '/') {
+        if (empty($parentId) || '/' == $parentId) {
             $postDir = isset($_POST['dir']) ? $_POST['dir'] : $dir;
             $dir = isset($_GET['dir']) ? $_GET['dir'] : $postDir; // Please, do not modify this dirname formatting.
 
-            if ($parentId === '/') {
+            if ('/' === $parentId) {
                 $dir = '/';
             }
 
@@ -6738,13 +6739,13 @@ class learnpath
                 $dir = '/';
             }
 
-            if (!empty($dir[0]) && $dir[0] == '.') {
+            if (!empty($dir[0]) && '.' == $dir[0]) {
                 $dir = substr($dir, 1);
             }
-            if (!empty($dir[0]) && $dir[0] != '/') {
+            if (!empty($dir[0]) && '/' != $dir[0]) {
                 $dir = '/'.$dir;
             }
-            if (isset($dir[strlen($dir) - 1]) && $dir[strlen($dir) - 1] != '/') {
+            if (isset($dir[strlen($dir) - 1]) && '/' != $dir[strlen($dir) - 1]) {
                 $dir .= '/';
             }
         } else {
@@ -6771,7 +6772,7 @@ class learnpath
         $tmp_filename = $filename;
         $filename = $tmp_filename.'.'.$extension;
 
-        if ($extension === 'html') {
+        if ('html' === $extension) {
             $content = stripslashes($content);
             $content = str_replace(
                 api_get_path(WEB_COURSE_PATH),
@@ -6865,15 +6866,15 @@ class learnpath
             $dir = '/';
         }
 
-        if (isset($dir[0]) && $dir[0] == '.') {
+        if (isset($dir[0]) && '.' == $dir[0]) {
             $dir = substr($dir, 1);
         }
 
-        if (isset($dir[0]) && $dir[0] != '/') {
+        if (isset($dir[0]) && '/' != $dir[0]) {
             $dir = '/'.$dir;
         }
 
-        if (isset($dir[strlen($dir) - 1]) && $dir[strlen($dir) - 1] != '/') {
+        if (isset($dir[strlen($dir) - 1]) && '/' != $dir[strlen($dir) - 1]) {
             $dir .= '/';
         }
 
@@ -6958,10 +6959,10 @@ class learnpath
                     WHERE lp.iid = ".intval($item_id);
             $result = Database::query($sql);
             while ($row = Database::fetch_array($result, 'ASSOC')) {
-                $_SESSION['parent_item_id'] = $row['item_type'] == 'dir' ? $item_id : 0;
+                $_SESSION['parent_item_id'] = 'dir' == $row['item_type'] ? $item_id : 0;
 
                 // Prevents wrong parent selection for document, see Bug#1251.
-                if ($row['item_type'] != 'dir') {
+                if ('dir' != $row['item_type']) {
                     $_SESSION['parent_item_id'] = $row['parent_item_id'];
                 }
 
@@ -6970,7 +6971,7 @@ class learnpath
                 }
                 $return .= '<div style="padding:10px;">';
 
-                if ($msg != '') {
+                if ('' != $msg) {
                     $return .= $msg;
                 }
 
@@ -7077,7 +7078,7 @@ class learnpath
             case 'dir':
             case 'asset':
             case 'sco':
-                if (isset($_GET['view']) && $_GET['view'] == 'build') {
+                if (isset($_GET['view']) && 'build' == $_GET['view']) {
                     $return .= $this->display_manipulate($item_id, $row['item_type']);
                     $return .= $this->display_item_form(
                         $row['item_type'],
@@ -7110,11 +7111,11 @@ class learnpath
                 $row_step = Database::fetch_array($res_step, 'ASSOC');
                 $return .= $this->display_manipulate($item_id, $row['item_type']);
 
-                if ($row['item_type'] === TOOL_DOCUMENT) {
+                if (TOOL_DOCUMENT === $row['item_type']) {
                     $return .= $this->display_document_form('edit', $item_id, $row_step);
                 }
 
-                if ($row['item_type'] === TOOL_READOUT_TEXT) {
+                if (TOOL_READOUT_TEXT === $row['item_type']) {
                     $return .= $this->displayFrmReadOutText('edit', $item_id, $row_step);
                 }
                 break;
@@ -7311,7 +7312,7 @@ class learnpath
         $tbl_quiz = Database::get_course_table(TABLE_QUIZ_TEST);
         $item_title = '';
         $item_description = '';
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $item_title = $extra_info['title'];
             $item_description = $extra_info['description'];
         } elseif (is_numeric($extra_info)) {
@@ -7328,7 +7329,7 @@ class learnpath
         $item_description = Security::remove_XSS($item_description);
 
         $parent = 0;
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $parent = $extra_info['parent_item_id'];
         }
 
@@ -7344,21 +7345,21 @@ class learnpath
         );
         $defaults = [];
 
-        if ($action === 'add') {
+        if ('add' === $action) {
             $legend = get_lang('Adding a test to the course');
-        } elseif ($action === 'move') {
+        } elseif ('move' === $action) {
             $legend = get_lang('Move the current test');
         } else {
             $legend = get_lang('Edit the current test');
         }
 
-        if (isset($_GET['edit']) && $_GET['edit'] == 'true') {
+        if (isset($_GET['edit']) && 'true' == $_GET['edit']) {
             $legend .= Display::return_message(get_lang('Warning ! ! !').' ! '.get_lang('Warning ! ! !EditingDocument'));
         }
 
         $form->addHeader($legend);
 
-        if ($action != 'move') {
+        if ('move' != $action) {
             $this->setItemTitle($form);
             $defaults['title'] = $item_title;
         }
@@ -7376,9 +7377,9 @@ class learnpath
             $id,
         ];
         for ($i = 0; $i < count($arrLP); $i++) {
-            if ($action != 'add') {
+            if ('add' != $action) {
                 if (
-                    ($arrLP[$i]['item_type'] == 'dir') &&
+                    ('dir' == $arrLP[$i]['item_type']) &&
                     !in_array($arrLP[$i]['id'], $arrHide) &&
                     !in_array($arrLP[$i]['parent_item_id'], $arrHide)
                 ) {
@@ -7395,7 +7396,7 @@ class learnpath
                     $arrHide[] = $arrLP[$i]['id'];
                 }
             } else {
-                if ($arrLP[$i]['item_type'] == 'dir') {
+                if ('dir' == $arrLP[$i]['item_type']) {
                     $selectParent->addOption(
                         $arrLP[$i]['title'],
                         $arrLP[$i]['id'],
@@ -7434,28 +7435,28 @@ class learnpath
                     if ($extra_info['previous_item_id'] == $arrLP[$i]['id']) {
                         $selectPrevious->setSelected($arrLP[$i]['id']);
                     }
-                } elseif ($action == 'add') {
+                } elseif ('add' == $action) {
                     $selectPrevious->setSelected($arrLP[$i]['id']);
                 }
             }
         }
 
-        if ($action != 'move') {
+        if ('move' != $action) {
             $arrHide = [];
             for ($i = 0; $i < count($arrLP); $i++) {
-                if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dir') {
+                if ($arrLP[$i]['id'] != $id && 'dir' != $arrLP[$i]['item_type']) {
                     $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                 }
             }
         }
 
-        if ($action === 'add') {
+        if ('add' === $action) {
             $form->addButtonSave(get_lang('Add test to course'), 'submit_button');
         } else {
             $form->addButtonSave(get_lang('Edit the current test'), 'submit_button');
         }
 
-        if ($action === 'move') {
+        if ('move' === $action) {
             $form->addHidden('title', $item_title);
             $form->addHidden('description', $item_description);
         }
@@ -7487,7 +7488,7 @@ class learnpath
         $course_id = api_get_course_int_id();
         $uploadPath = DIR_HOTPOTATOES;
 
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $item_title = stripslashes($extra_info['title']);
             $item_description = stripslashes($extra_info['description']);
         } elseif (is_numeric($extra_info)) {
@@ -7515,20 +7516,20 @@ class learnpath
         }
 
         $parent = 0;
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $parent = $extra_info['parent_item_id'];
         }
 
         $arrLP = $this->getItemsForForm();
         $legend = '<legend>';
-        if ($action == 'add') {
+        if ('add' == $action) {
             $legend .= get_lang('Adding a test to the course');
-        } elseif ($action == 'move') {
+        } elseif ('move' == $action) {
             $legend .= get_lang('Move the current test');
         } else {
             $legend .= get_lang('Edit the current test');
         }
-        if (isset($_GET['edit']) && $_GET['edit'] == 'true') {
+        if (isset($_GET['edit']) && 'true' == $_GET['edit']) {
             $legend .= Display:: return_message(
                 get_lang('Warning ! ! !').' ! '.get_lang('Warning ! ! !EditingDocument')
             );
@@ -7547,8 +7548,8 @@ class learnpath
 
         if (count($arrLP) > 0) {
             for ($i = 0; $i < count($arrLP); $i++) {
-                if ($action != 'add') {
-                    if ($arrLP[$i]['item_type'] == 'dir' &&
+                if ('add' != $action) {
+                    if ('dir' == $arrLP[$i]['item_type'] &&
                         !in_array($arrLP[$i]['id'], $arrHide) &&
                         !in_array($arrLP[$i]['parent_item_id'], $arrHide)
                     ) {
@@ -7557,7 +7558,7 @@ class learnpath
                         $arrHide[] = $arrLP[$i]['id'];
                     }
                 } else {
-                    if ($arrLP[$i]['item_type'] == 'dir') {
+                    if ('dir' == $arrLP[$i]['item_type']) {
                         $return .= '<option '.(($parent == $arrLP[$i]['id']) ? 'selected="selected" ' : '').'style="padding-left:'.($arrLP[$i]['depth'] * 10).'px;" value="'.$arrLP[$i]['id'].'">'.$arrLP[$i]['title'].'</option>';
                     }
                 }
@@ -7578,7 +7579,7 @@ class learnpath
             if ($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id) {
                 if ($extra_info['previous_item_id'] == $arrLP[$i]['id']) {
                     $selected = 'selected="selected" ';
-                } elseif ($action == 'add') {
+                } elseif ('add' == $action) {
                     $selected = 'selected="selected" ';
                 } else {
                     $selected = '';
@@ -7593,7 +7594,7 @@ class learnpath
         $return .= '</td>';
         $return .= '</tr>';
 
-        if ($action != 'move') {
+        if ('move' != $action) {
             $return .= '<tr>';
             $return .= '<td class="label"><label for="idTitle">'.get_lang('Title').' :</label></td>';
             $return .= '<td class="input"><input id="idTitle" name="title" type="text" value="'.$item_title.'" /></td>';
@@ -7609,7 +7610,7 @@ class learnpath
 
                 $arrHide = [];
                 for ($i = 0; $i < count($arrLP); $i++) {
-                    if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dir') {
+                    if ($arrLP[$i]['id'] != $id && 'dir' != $arrLP[$i]['item_type']) {
                         $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                     }
                 }
@@ -7622,7 +7623,7 @@ class learnpath
         $return .= '</tr>';
         $return .= '</table>';
 
-        if ($action == 'move') {
+        if ('move' == $action) {
             $return .= '<input name="title" type="hidden" value="'.$item_title.'" />';
             $return .= '<input name="description" type="hidden" value="'.$item_description.'" />';
         }
@@ -7658,7 +7659,7 @@ class learnpath
         $item_title = '';
         $item_description = '';
 
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $item_title = stripslashes($extra_info['title']);
         } elseif (is_numeric($extra_info)) {
             $sql = "SELECT forum_title as title, forum_comment as comment
@@ -7672,7 +7673,7 @@ class learnpath
             $item_description = $row['comment'];
         }
         $parent = 0;
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $parent = $extra_info['parent_item_id'];
         }
         $arrLP = $this->getItemsForForm();
@@ -7680,9 +7681,9 @@ class learnpath
         $arrLP = isset($this->arrMenu) ? $this->arrMenu : [];
         unset($this->arrMenu);
 
-        if ($action == 'add') {
+        if ('add' == $action) {
             $legend = get_lang('Adding a forum to the course');
-        } elseif ($action == 'move') {
+        } elseif ('move' == $action) {
             $legend = get_lang('Move the current forum');
         } else {
             $legend = get_lang('Edit the current forum');
@@ -7697,7 +7698,7 @@ class learnpath
 
         $form->addHeader($legend);
 
-        if ($action != 'move') {
+        if ('move' != $action) {
             $this->setItemTitle($form);
             $defaults['title'] = $item_title;
         }
@@ -7713,8 +7714,8 @@ class learnpath
             $id,
         ];
         for ($i = 0; $i < count($arrLP); $i++) {
-            if ($action != 'add') {
-                if ($arrLP[$i]['item_type'] == 'dir' &&
+            if ('add' != $action) {
+                if ('dir' == $arrLP[$i]['item_type'] &&
                     !in_array($arrLP[$i]['id'], $arrHide) &&
                     !in_array($arrLP[$i]['parent_item_id'], $arrHide)
                 ) {
@@ -7731,7 +7732,7 @@ class learnpath
                     $arrHide[] = $arrLP[$i]['id'];
                 }
             } else {
-                if ($arrLP[$i]['item_type'] == 'dir') {
+                if ('dir' == $arrLP[$i]['item_type']) {
                     $selectParent->addOption(
                         $arrLP[$i]['title'],
                         $arrLP[$i]['id'],
@@ -7770,13 +7771,13 @@ class learnpath
                     $extra_info['previous_item_id'] == $arrLP[$i]['id']
                 ) {
                     $selectPrevious->setSelected($arrLP[$i]['id']);
-                } elseif ($action == 'add') {
+                } elseif ('add' == $action) {
                     $selectPrevious->setSelected($arrLP[$i]['id']);
                 }
             }
         }
 
-        if ($action != 'move') {
+        if ('move' != $action) {
             $id_prerequisite = 0;
             if (is_array($arrLP)) {
                 foreach ($arrLP as $key => $value) {
@@ -7789,12 +7790,12 @@ class learnpath
 
             $arrHide = [];
             for ($i = 0; $i < count($arrLP); $i++) {
-                if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dir') {
+                if ($arrLP[$i]['id'] != $id && 'dir' != $arrLP[$i]['item_type']) {
                     if (isset($extra_info['previous_item_id']) &&
                         $extra_info['previous_item_id'] == $arrLP[$i]['id']
                     ) {
                         $s_selected_position = $arrLP[$i]['id'];
-                    } elseif ($action == 'add') {
+                    } elseif ('add' == $action) {
                         $s_selected_position = 0;
                     }
                     $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
@@ -7802,13 +7803,13 @@ class learnpath
             }
         }
 
-        if ($action == 'add') {
+        if ('add' == $action) {
             $form->addButtonSave(get_lang('Add forum to course'), 'submit_button');
         } else {
             $form->addButtonSave(get_lang('Edit the current forum'), 'submit_button');
         }
 
-        if ($action == 'move') {
+        if ('move' == $action) {
             $form->addHidden('title', $item_title);
             $form->addHidden('description', $item_description);
         }
@@ -7846,7 +7847,7 @@ class learnpath
 
         $item_title = '';
         $item_description = '';
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $item_title = stripslashes($extra_info['title']);
         } elseif (is_numeric($extra_info)) {
             $sql = "SELECT thread_title as title FROM $tbl_forum
@@ -7860,7 +7861,7 @@ class learnpath
         }
 
         $parent = 0;
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $parent = $extra_info['parent_item_id'];
         }
 
@@ -7876,9 +7877,9 @@ class learnpath
         );
         $defaults = [];
 
-        if ($action == 'add') {
+        if ('add' == $action) {
             $legend = get_lang('Adding a forum to the course');
-        } elseif ($action == 'move') {
+        } elseif ('move' == $action) {
             $legend = get_lang('Move the current forum');
         } else {
             $legend = get_lang('Edit the current forum');
@@ -7898,9 +7899,9 @@ class learnpath
         ];
 
         for ($i = 0; $i < count($arrLP); $i++) {
-            if ($action != 'add') {
+            if ('add' != $action) {
                 if (
-                    ($arrLP[$i]['item_type'] == 'dir') &&
+                    ('dir' == $arrLP[$i]['item_type']) &&
                     !in_array($arrLP[$i]['id'], $arrHide) &&
                     !in_array($arrLP[$i]['parent_item_id'], $arrHide)
                 ) {
@@ -7917,7 +7918,7 @@ class learnpath
                     $arrHide[] = $arrLP[$i]['id'];
                 }
             } else {
-                if ($arrLP[$i]['item_type'] == 'dir') {
+                if ('dir' == $arrLP[$i]['item_type']) {
                     $selectParent->addOption(
                         $arrLP[$i]['title'],
                         $arrLP[$i]['id'],
@@ -7931,7 +7932,7 @@ class learnpath
             }
         }
 
-        if ($arrLP != null) {
+        if (null != $arrLP) {
             reset($arrLP);
         }
 
@@ -7952,18 +7953,18 @@ class learnpath
 
                 if ($extra_info['previous_item_id'] == $arrLP[$i]['id']) {
                     $selectPrevious->setSelected($arrLP[$i]['id']);
-                } elseif ($action == 'add') {
+                } elseif ('add' == $action) {
                     $selectPrevious->setSelected($arrLP[$i]['id']);
                 }
             }
         }
 
-        if ($action != 'move') {
+        if ('move' != $action) {
             $this->setItemTitle($form);
             $defaults['title'] = $item_title;
 
             $id_prerequisite = 0;
-            if ($arrLP != null) {
+            if (null != $arrLP) {
                 foreach ($arrLP as $key => $value) {
                     if ($value['id'] == $id) {
                         $id_prerequisite = $value['prerequisite'];
@@ -7975,10 +7976,10 @@ class learnpath
             $arrHide = [];
             $s_selected_position = 0;
             for ($i = 0; $i < count($arrLP); $i++) {
-                if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dir') {
+                if ($arrLP[$i]['id'] != $id && 'dir' != $arrLP[$i]['item_type']) {
                     if ($extra_info['previous_item_id'] == $arrLP[$i]['id']) {
                         $s_selected_position = $arrLP[$i]['id'];
-                    } elseif ($action == 'add') {
+                    } elseif ('add' == $action) {
                         $s_selected_position = 0;
                     }
                     $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
@@ -7996,9 +7997,9 @@ class learnpath
             foreach ($arrHide as $key => $value) {
                 $selectPrerequisites->addOption($value['value'], $key);
 
-                if ($key == $s_selected_position && $action == 'add') {
+                if ($key == $s_selected_position && 'add' == $action) {
                     $selectPrerequisites->setSelected($key);
-                } elseif ($key == $id_prerequisite && $action == 'edit') {
+                } elseif ($key == $id_prerequisite && 'edit' == $action) {
                     $selectPrerequisites->setSelected($key);
                 }
             }
@@ -8006,7 +8007,7 @@ class learnpath
 
         $form->addButtonSave(get_lang('Validate'), 'submit_button');
 
-        if ($action == 'move') {
+        if ('move' == $action) {
             $form->addHidden('title', $item_title);
             $form->addHidden('description', $item_description);
         }
@@ -8054,14 +8055,14 @@ class learnpath
         $item_description = '';
         $item_path_fck = '';
 
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $item_title = $extra_info['title'];
             $item_description = $extra_info['description'];
             $item_path = api_get_path(WEB_COURSE_PATH).$_course['path'].'/scorm/'.$this->path.'/'.stripslashes($extra_info['path']);
             $item_path_fck = '/scorm/'.$this->path.'/'.stripslashes($extra_info['path']);
         }
         $parent = 0;
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $parent = $extra_info['parent_item_id'];
         }
 
@@ -8071,7 +8072,7 @@ class learnpath
                     lp_id = ".$this->lp_id." AND
                     iid != $id";
 
-        if ($item_type == 'dir') {
+        if ('dir' == $item_type) {
             $sql .= " AND parent_item_id = 0";
         }
 
@@ -8115,8 +8116,8 @@ class learnpath
         $arrHide[0]['padding'] = 20;
         $charset = api_get_system_encoding();
         for ($i = 0; $i < count($arrLP); $i++) {
-            if ($action != 'add') {
-                if ($arrLP[$i]['item_type'] === 'dir' && !in_array($arrLP[$i]['id'], $arrHide) &&
+            if ('add' != $action) {
+                if ('dir' === $arrLP[$i]['item_type'] && !in_array($arrLP[$i]['id'], $arrHide) &&
                     !in_array($arrLP[$i]['parent_item_id'], $arrHide)
                 ) {
                     $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
@@ -8126,7 +8127,7 @@ class learnpath
                     }
                 }
             } else {
-                if ($arrLP[$i]['item_type'] === 'dir') {
+                if ('dir' === $arrLP[$i]['item_type']) {
                     $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                     $arrHide[$arrLP[$i]['id']]['padding'] = 20 + $arrLP[$i]['depth'] * 20;
                     if ($parent == $arrLP[$i]['id']) {
@@ -8136,7 +8137,7 @@ class learnpath
             }
         }
 
-        if ($action != 'move') {
+        if ('move' != $action) {
             $this->setItemTitle($form);
         } else {
             $form->addElement('hidden', 'title');
@@ -8174,13 +8175,13 @@ class learnpath
         // POSITION
         for ($i = 0; $i < count($arrLP); $i++) {
             if ($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id &&
-                $arrLP[$i]['item_type'] !== TOOL_LP_FINAL_ITEM) {
+                TOOL_LP_FINAL_ITEM !== $arrLP[$i]['item_type']) {
                 //this is the same!
                 if (isset($extra_info['previous_item_id']) &&
                     $extra_info['previous_item_id'] == $arrLP[$i]['id']
                 ) {
                     $s_selected_position = $arrLP[$i]['id'];
-                } elseif ($action == 'add') {
+                } elseif ('add' == $action) {
                     $s_selected_position = $arrLP[$i]['id'];
                 }
 
@@ -8209,7 +8210,7 @@ class learnpath
         }
 
         // When new chapter add at the end
-        if ($action === 'add_item') {
+        if ('add_item' === $action) {
             $position->setSelected($lastPosition);
         }
 
@@ -8220,7 +8221,7 @@ class learnpath
         $form->addButtonSave(get_lang('Save section'), 'submit_button');
 
         //fix in order to use the tab
-        if ($item_type === 'dir') {
+        if ('dir' === $item_type) {
             $form->addElement('hidden', 'type', 'dir');
         }
 
@@ -8231,8 +8232,8 @@ class learnpath
 
         //assets can't be modified
         //$item_type == 'asset' ||
-        if (($item_type == 'sco') && ($extension == 'html' || $extension == 'htm')) {
-            if ($item_type == 'sco') {
+        if (('sco' == $item_type) && ('html' == $extension || 'htm' == $extension)) {
+            if ('sco' == $item_type) {
                 $form->addElement(
                     'html',
                     '<script>alert("'.get_lang('Warning ! ! !WhenEditingScorm').'")</script>'
@@ -8309,10 +8310,10 @@ class learnpath
         $item_description = '';
         //If action==edit document
         //We don't display the document form if it's not an editable document (html or txt file)
-        if ($action === 'edit') {
+        if ('edit' === $action) {
             if (is_array($extra_info)) {
                 $path_parts = pathinfo($extra_info['dir']);
-                if ($path_parts['extension'] != 'txt' && $path_parts['extension'] != 'html') {
+                if ('txt' != $path_parts['extension'] && 'html' != $path_parts['extension']) {
                     $no_display_edit_textarea = true;
                 }
             }
@@ -8321,7 +8322,7 @@ class learnpath
 
         // If action==add an existing document
         // We don't display the document form if it's not an editable document (html or txt file).
-        if ($action === 'add') {
+        if ('add' === $action) {
             if (is_numeric($extra_info)) {
                 $extra_info = (int) $extra_info;
                 $sql_doc = "SELECT path FROM $tbl_doc
@@ -8329,7 +8330,7 @@ class learnpath
                 $result = Database::query($sql_doc);
                 $path_file = Database::result($result, 0, 0);
                 $path_parts = pathinfo($path_file);
-                if ($path_parts['extension'] != 'txt' && $path_parts['extension'] != 'html') {
+                if ('txt' != $path_parts['extension'] && 'html' != $path_parts['extension']) {
                     $no_display_add = true;
                 }
             }
@@ -8337,7 +8338,7 @@ class learnpath
 
         $item_title = '';
         $item_description = '';
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $item_title = stripslashes($extra_info['title']);
             $item_description = stripslashes($extra_info['description']);
             if (empty($item_title)) {
@@ -8361,7 +8362,7 @@ class learnpath
 
         $return = '<legend>';
         $parent = 0;
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $parent = $extra_info['parent_item_id'];
         }
 
@@ -8370,16 +8371,16 @@ class learnpath
         $arrLP = isset($this->arrMenu) ? $this->arrMenu : [];
         unset($this->arrMenu);
 
-        if ($action == 'add') {
+        if ('add' == $action) {
             $return .= get_lang('Create a new document');
-        } elseif ($action == 'move') {
+        } elseif ('move' == $action) {
             $return .= get_lang('Move the current document');
         } else {
             $return .= get_lang('Edit the current document');
         }
         $return .= '</legend>';
 
-        if (isset($_GET['edit']) && $_GET['edit'] == 'true') {
+        if (isset($_GET['edit']) && 'true' == $_GET['edit']) {
             $return .= Display::return_message(
                 '<strong>'.get_lang('Warning ! ! !').' !</strong><br />'.get_lang('Warning ! ! !EditingDocument'),
                 false
@@ -8399,9 +8400,9 @@ class learnpath
         $defaults['description'] = $item_description;
         $form->addElement('html', $return);
 
-        if ($action != 'move') {
+        if ('move' != $action) {
             $data = $this->generate_lp_folder($_course);
-            if ($action != 'edit') {
+            if ('edit' != $action) {
                 $folders = DocumentManager::get_all_document_folders(
                     $_course,
                     0,
@@ -8427,8 +8428,8 @@ class learnpath
         $arrHide[0]['padding'] = 20;
 
         for ($i = 0; $i < count($arrLP); $i++) {
-            if ($action != 'add') {
-                if ($arrLP[$i]['item_type'] == 'dir' &&
+            if ('add' != $action) {
+                if ('dir' == $arrLP[$i]['item_type'] &&
                     !in_array($arrLP[$i]['id'], $arrHide) &&
                     !in_array($arrLP[$i]['parent_item_id'], $arrHide)
                 ) {
@@ -8436,7 +8437,7 @@ class learnpath
                     $arrHide[$arrLP[$i]['id']]['padding'] = 20 + $arrLP[$i]['depth'] * 20;
                 }
             } else {
-                if ($arrLP[$i]['item_type'] == 'dir') {
+                if ('dir' == $arrLP[$i]['item_type']) {
                     $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                     $arrHide[$arrLP[$i]['id']]['padding'] = 20 + $arrLP[$i]['depth'] * 20;
                 }
@@ -8455,7 +8456,7 @@ class learnpath
 
         $my_count = 0;
         foreach ($arrHide as $key => $value) {
-            if ($my_count != 0) {
+            if (0 != $my_count) {
                 // The LP name is also the first section and is not in the same charset like the other sections.
                 $value['value'] = Security::remove_XSS($value['value']);
                 $parentSelect->addOption(
@@ -8489,7 +8490,7 @@ class learnpath
         // POSITION
         for ($i = 0; $i < count($arrLP); $i++) {
             if (($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id) ||
-                $arrLP[$i]['item_type'] == TOOL_LP_FINAL_ITEM
+                TOOL_LP_FINAL_ITEM == $arrLP[$i]['item_type']
             ) {
                 $arrHide[$arrLP[$i]['id']]['value'] = get_lang('After').' "'.$arrLP[$i]['title'].'"';
             }
@@ -8520,11 +8521,11 @@ class learnpath
             reset($arrLP);
         }
 
-        if ($action != 'move') {
+        if ('move' != $action) {
             $arrHide = [];
             for ($i = 0; $i < count($arrLP); $i++) {
-                if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dir' &&
-                    $arrLP[$i]['item_type'] !== TOOL_LP_FINAL_ITEM
+                if ($arrLP[$i]['id'] != $id && 'dir' != $arrLP[$i]['item_type'] &&
+                    TOOL_LP_FINAL_ITEM !== $arrLP[$i]['item_type']
                 ) {
                     $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                 }
@@ -8533,8 +8534,8 @@ class learnpath
             if (!$no_display_add) {
                 $item_type = isset($extra_info['item_type']) ? $extra_info['item_type'] : null;
                 $edit = isset($_GET['edit']) ? $_GET['edit'] : null;
-                if ($extra_info == 'new' || $item_type == TOOL_DOCUMENT ||
-                    $item_type == TOOL_LP_FINAL_ITEM || $edit == 'true'
+                if ('new' == $extra_info || TOOL_DOCUMENT == $item_type ||
+                    TOOL_LP_FINAL_ITEM == $item_type || 'true' == $edit
                 ) {
                     if (isset($_POST['content'])) {
                         $content = stripslashes($_POST['content']);
@@ -8567,7 +8568,7 @@ class learnpath
                         // A new document, it is in the root of the repository.
                         $relative_path = '';
                         $relative_prefix = '';
-                        if (is_array($extra_info) && $extra_info != 'new') {
+                        if (is_array($extra_info) && 'new' != $extra_info) {
                             // The document already exists. Whe have to determine its relative path towards the repository root.
                             $relative_path = explode('/', $extra_info['dir']);
                             $cnt = count($relative_path) - 2;
@@ -8596,11 +8597,11 @@ class learnpath
                             'BaseHref' => api_get_path(WEB_COURSE_PATH).api_get_course_path().'/document/'.$relative_path,
                         ];
 
-                        if ($_GET['action'] == 'add_item') {
+                        if ('add_item' == $_GET['action']) {
                             $class = 'add';
                             $text = get_lang('Add this document to the course');
                         } else {
-                            if ($_GET['action'] == 'edit_item') {
+                            if ('edit_item' == $_GET['action']) {
                                 $class = 'save';
                                 $text = get_lang('Save document');
                             }
@@ -8623,13 +8624,13 @@ class learnpath
             }
         }
         if (isset($extra_info['item_type']) &&
-            $extra_info['item_type'] == TOOL_LP_FINAL_ITEM
+            TOOL_LP_FINAL_ITEM == $extra_info['item_type']
         ) {
             $parentSelect->freeze();
             $position->freeze();
         }
 
-        if ($action == 'move') {
+        if ('move' == $action) {
             $form->addElement('hidden', 'title', $item_title);
             $form->addElement('hidden', 'description', $item_description);
         }
@@ -8669,10 +8670,10 @@ class learnpath
         $item_description = '';
         //If action==edit document
         //We don't display the document form if it's not an editable document (html or txt file)
-        if ($action == 'edit') {
+        if ('edit' == $action) {
             if (is_array($extra_info)) {
                 $path_parts = pathinfo($extra_info['dir']);
-                if ($path_parts['extension'] != "txt" && $path_parts['extension'] != "html") {
+                if ("txt" != $path_parts['extension'] && "html" != $path_parts['extension']) {
                     $no_display_edit_textarea = true;
                 }
             }
@@ -8681,7 +8682,7 @@ class learnpath
 
         $item_title = '';
         $item_description = '';
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $item_title = stripslashes($extra_info['title']);
             $item_description = stripslashes($extra_info['description']);
             $item_terms = stripslashes($extra_info['terms']);
@@ -8702,7 +8703,7 @@ class learnpath
         }
 
         $parent = 0;
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $parent = $extra_info['parent_item_id'];
         }
 
@@ -8711,7 +8712,7 @@ class learnpath
         $arrLP = isset($this->arrMenu) ? $this->arrMenu : [];
         unset($this->arrMenu);
 
-        if ($action === 'add') {
+        if ('add' === $action) {
             $formHeader = get_lang('Create a new document');
         } else {
             $formHeader = get_lang('Edit the current document');
@@ -8747,7 +8748,7 @@ class learnpath
 
         $data = $this->generate_lp_folder($_course);
 
-        if ($action != 'edit') {
+        if ('edit' != $action) {
             $folders = DocumentManager::get_all_document_folders($_course, 0, true);
             DocumentManager::build_directory_selector(
                 $folders,
@@ -8768,8 +8769,8 @@ class learnpath
         $arrHide[0]['padding'] = 20;
 
         for ($i = 0; $i < count($arrLP); $i++) {
-            if ($action != 'add') {
-                if ($arrLP[$i]['item_type'] == 'dir' &&
+            if ('add' != $action) {
+                if ('dir' == $arrLP[$i]['item_type'] &&
                     !in_array($arrLP[$i]['id'], $arrHide) &&
                     !in_array($arrLP[$i]['parent_item_id'], $arrHide)
                 ) {
@@ -8777,7 +8778,7 @@ class learnpath
                     $arrHide[$arrLP[$i]['id']]['padding'] = 20 + $arrLP[$i]['depth'] * 20;
                 }
             } else {
-                if ($arrLP[$i]['item_type'] == 'dir') {
+                if ('dir' == $arrLP[$i]['item_type']) {
                     $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                     $arrHide[$arrLP[$i]['id']]['padding'] = 20 + $arrLP[$i]['depth'] * 20;
                 }
@@ -8793,7 +8794,7 @@ class learnpath
 
         $my_count = 0;
         foreach ($arrHide as $key => $value) {
-            if ($my_count != 0) {
+            if (0 != $my_count) {
                 // The LP name is also the first section and is not in the same charset like the other sections.
                 $value['value'] = Security::remove_XSS($value['value']);
                 $parent_select->addOption(
@@ -8831,10 +8832,10 @@ class learnpath
 
         for ($i = 0; $i < count($arrLP); $i++) {
             if (($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id) &&
-                $arrLP[$i]['item_type'] !== TOOL_LP_FINAL_ITEM
+                TOOL_LP_FINAL_ITEM !== $arrLP[$i]['item_type']
             ) {
                 if ((isset($extra_info['previous_item_id']) &&
-                    $extra_info['previous_item_id'] == $arrLP[$i]['id']) || $action == 'add'
+                    $extra_info['previous_item_id'] == $arrLP[$i]['id']) || 'add' == $action
                 ) {
                     $s_selected_position = $arrLP[$i]['id'];
                 }
@@ -8871,8 +8872,8 @@ class learnpath
         $arrHide = [];
 
         for ($i = 0; $i < count($arrLP); $i++) {
-            if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dir' &&
-                $arrLP[$i]['item_type'] !== TOOL_LP_FINAL_ITEM
+            if ($arrLP[$i]['id'] != $id && 'dir' != $arrLP[$i]['item_type'] &&
+                TOOL_LP_FINAL_ITEM !== $arrLP[$i]['item_type']
             ) {
                 $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
             }
@@ -8882,7 +8883,7 @@ class learnpath
             $item_type = isset($extra_info['item_type']) ? $extra_info['item_type'] : null;
             $edit = isset($_GET['edit']) ? $_GET['edit'] : null;
 
-            if ($extra_info == 'new' || $item_type == TOOL_READOUT_TEXT || $edit == 'true') {
+            if ('new' == $extra_info || TOOL_READOUT_TEXT == $item_type || 'true' == $edit) {
                 if (!$no_display_edit_textarea) {
                     $content = '';
 
@@ -8895,12 +8896,12 @@ class learnpath
                     }
 
                     // A new document, it is in the root of the repository.
-                    if (is_array($extra_info) && $extra_info != 'new') {
+                    if (is_array($extra_info) && 'new' != $extra_info) {
                     } else {
                         $this->generate_lp_folder($_course);
                     }
 
-                    if ($_GET['action'] == 'add_item') {
+                    if ('add_item' == $_GET['action']) {
                         $text = get_lang('Add this document to the course');
                     } else {
                         $text = get_lang('Save document');
@@ -8955,11 +8956,11 @@ class learnpath
         $result = $this->generate_lp_folder($courseInfo);
         $dir = $result['dir'];
 
-        if (empty($parentId) || $parentId == '/') {
+        if (empty($parentId) || '/' == $parentId) {
             $postDir = isset($_POST['dir']) ? $_POST['dir'] : $dir;
             $dir = isset($_GET['dir']) ? $_GET['dir'] : $postDir; // Please, do not modify this dirname formatting.
 
-            if ($parentId === '/') {
+            if ('/' === $parentId) {
                 $dir = '/';
             }
 
@@ -8968,13 +8969,13 @@ class learnpath
                 $dir = '/';
             }
 
-            if (!empty($dir[0]) && $dir[0] == '.') {
+            if (!empty($dir[0]) && '.' == $dir[0]) {
                 $dir = substr($dir, 1);
             }
-            if (!empty($dir[0]) && $dir[0] != '/') {
+            if (!empty($dir[0]) && '/' != $dir[0]) {
                 $dir = '/'.$dir;
             }
-            if (isset($dir[strlen($dir) - 1]) && $dir[strlen($dir) - 1] != '/') {
+            if (isset($dir[strlen($dir) - 1]) && '/' != $dir[strlen($dir) - 1]) {
                 $dir .= '/';
             }
         } else {
@@ -9021,7 +9022,7 @@ class learnpath
 
         $putContent = file_put_contents($filepath.$filename, $content);
 
-        if ($putContent === false) {
+        if (false === $putContent) {
             return 0;
         }
 
@@ -9090,7 +9091,7 @@ class learnpath
         $item_description = '';
         $item_url = '';
 
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $item_title = stripslashes($extra_info['title']);
             $item_description = stripslashes($extra_info['description']);
             $item_url = stripslashes($extra_info['url']);
@@ -9113,7 +9114,7 @@ class learnpath
         );
         $defaults = [];
         $parent = 0;
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $parent = $extra_info['parent_item_id'];
         }
 
@@ -9123,9 +9124,9 @@ class learnpath
         $arrLP = isset($this->arrMenu) ? $this->arrMenu : [];
         unset($this->arrMenu);
 
-        if ($action == 'add') {
+        if ('add' == $action) {
             $legend = get_lang('Adding a link to the course');
-        } elseif ($action == 'move') {
+        } elseif ('move' == $action) {
             $legend = get_lang('Move the current link');
         } else {
             $legend = get_lang('Edit the current link');
@@ -9133,7 +9134,7 @@ class learnpath
 
         $form->addHeader($legend);
 
-        if ($action != 'move') {
+        if ('move' != $action) {
             $this->setItemTitle($form);
             $defaults['title'] = $item_title;
         }
@@ -9152,9 +9153,9 @@ class learnpath
         $parent_item_id = Session::read('parent_item_id', 0);
 
         for ($i = 0; $i < count($arrLP); $i++) {
-            if ($action != 'add') {
+            if ('add' != $action) {
                 if (
-                    ($arrLP[$i]['item_type'] == 'dir') &&
+                    ('dir' == $arrLP[$i]['item_type']) &&
                     !in_array($arrLP[$i]['id'], $arrHide) &&
                     !in_array($arrLP[$i]['parent_item_id'], $arrHide)
                 ) {
@@ -9171,7 +9172,7 @@ class learnpath
                     $arrHide[] = $arrLP[$i]['id'];
                 }
             } else {
-                if ($arrLP[$i]['item_type'] == 'dir') {
+                if ('dir' == $arrLP[$i]['item_type']) {
                     $selectParent->addOption(
                         $arrLP[$i]['title'],
                         $arrLP[$i]['id'],
@@ -9206,13 +9207,13 @@ class learnpath
 
                 if ($extra_info['previous_item_id'] == $arrLP[$i]['id']) {
                     $selectPrevious->setSelected($arrLP[$i]['id']);
-                } elseif ($action == 'add') {
+                } elseif ('add' == $action) {
                     $selectPrevious->setSelected($arrLP[$i]['id']);
                 }
             }
         }
 
-        if ($action != 'move') {
+        if ('move' != $action) {
             $urlAttributes = ['class' => 'learnpath_item_form'];
 
             if (is_numeric($extra_info)) {
@@ -9223,19 +9224,19 @@ class learnpath
             $defaults['url'] = $item_url;
             $arrHide = [];
             for ($i = 0; $i < count($arrLP); $i++) {
-                if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dir') {
+                if ($arrLP[$i]['id'] != $id && 'dir' != $arrLP[$i]['item_type']) {
                     $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                 }
             }
         }
 
-        if ($action == 'add') {
+        if ('add' == $action) {
             $form->addButtonSave(get_lang('Add link to course'), 'submit_button');
         } else {
             $form->addButtonSave(get_lang('Edit the current link'), 'submit_button');
         }
 
-        if ($action == 'move') {
+        if ('move' == $action) {
             $form->addHidden('title', $item_title);
             $form->addHidden('description', $item_description);
         }
@@ -9272,7 +9273,7 @@ class learnpath
         $tbl_publication = Database::get_course_table(TABLE_STUDENT_PUBLICATION);
 
         $item_title = get_lang('Assignments');
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $item_title = stripslashes($extra_info['title']);
             $item_description = stripslashes($extra_info['description']);
         } elseif (is_numeric($extra_info)) {
@@ -9289,7 +9290,7 @@ class learnpath
         }
 
         $parent = 0;
-        if ($id != 0 && is_array($extra_info)) {
+        if (0 != $id && is_array($extra_info)) {
             $parent = $extra_info['parent_item_id'];
         }
 
@@ -9301,15 +9302,15 @@ class learnpath
 
         $form = new FormValidator('frm_student_publication', 'post', '#');
 
-        if ($action == 'add') {
+        if ('add' == $action) {
             $form->addHeader(get_lang('Assignments'));
-        } elseif ($action == 'move') {
+        } elseif ('move' == $action) {
             $form->addHeader(get_lang('Move the current assignment'));
         } else {
             $form->addHeader(get_lang('Edit the current assignment'));
         }
 
-        if ($action != 'move') {
+        if ('move' != $action) {
             $this->setItemTitle($form);
         }
 
@@ -9326,9 +9327,9 @@ class learnpath
 
         $arrHide = [$id];
         for ($i = 0; $i < count($arrLP); $i++) {
-            if ($action != 'add') {
+            if ('add' != $action) {
                 if (
-                    ($arrLP[$i]['item_type'] == 'dir') &&
+                    ('dir' == $arrLP[$i]['item_type']) &&
                     !in_array($arrLP[$i]['id'], $arrHide) &&
                     !in_array($arrLP[$i]['parent_item_id'], $arrHide)
                 ) {
@@ -9345,7 +9346,7 @@ class learnpath
                     $arrHide[] = $arrLP[$i]['id'];
                 }
             } else {
-                if ($arrLP[$i]['item_type'] == 'dir') {
+                if ('dir' == $arrLP[$i]['item_type']) {
                     $parentSelect->addOption(
                         $arrLP[$i]['title'],
                         $arrLP[$i]['id'],
@@ -9379,19 +9380,19 @@ class learnpath
 
                 if ($extra_info['previous_item_id'] == $arrLP[$i]['id']) {
                     $previousSelect->setSelected($arrLP[$i]['id']);
-                } elseif ($action == 'add') {
+                } elseif ('add' == $action) {
                     $previousSelect->setSelected($arrLP[$i]['id']);
                 }
             }
         }
 
-        if ($action == 'add') {
+        if ('add' == $action) {
             $form->addButtonCreate(get_lang('Add assignment to course'), 'submit_button');
         } else {
             $form->addButtonCreate(get_lang('Edit the current assignment'), 'submit_button');
         }
 
-        if ($action == 'move') {
+        if ('move' == $action) {
             $form->addHidden('title', $item_title);
             $form->addHidden('description', $item_description);
         }
@@ -9446,7 +9447,7 @@ class learnpath
 
         $url = api_get_self().'?'.api_get_cidreq().'&view=build&id='.$item_id.'&lp_id='.$this->lp_id;
 
-        if ($item_type != TOOL_LP_FINAL_ITEM) {
+        if (TOOL_LP_FINAL_ITEM != $item_type) {
             $return .= Display::url(
                 Display::return_icon(
                     'edit.png',
@@ -9469,7 +9470,7 @@ class learnpath
         }
 
         // Commented for now as prerequisites cannot be added to chapters.
-        if ($item_type != 'dir') {
+        if ('dir' != $item_type) {
             $return .= Display::url(
                 Display::return_icon(
                     'accept.png',
@@ -9546,8 +9547,8 @@ class learnpath
         $list = $this->getItemsForForm(true);
 
         foreach ($list as $row_zero) {
-            if ($row_zero['item_type'] !== TOOL_LP_FINAL_ITEM) {
-                if ($row_zero['item_type'] == TOOL_QUIZ) {
+            if (TOOL_LP_FINAL_ITEM !== $row_zero['item_type']) {
+                if (TOOL_QUIZ == $row_zero['item_type']) {
                     $row_zero['title'] = Exercise::get_formated_title_variable($row_zero['title']);
                 }
                 $js_var = json_encode(get_lang('After').' '.$row_zero['title']);
@@ -9751,10 +9752,10 @@ class learnpath
             $masteryScoreAsMinValue = isset($masteryScore[$item['id']]) ? $masteryScore[$item['id']] : 0;
 
             $return .= '<tr>';
-            $return .= '<td '.(($item['item_type'] != TOOL_QUIZ && $item['item_type'] != TOOL_HOTPOTATOES) ? ' colspan="3"' : '').'>';
+            $return .= '<td '.((TOOL_QUIZ != $item['item_type'] && TOOL_HOTPOTATOES != $item['item_type']) ? ' colspan="3"' : '').'>';
             $return .= '<div style="margin-left:'.($item['depth'] * 20).'px;" class="radio learnpath">';
             $return .= '<label for="id'.$item['id'].'">';
-            $return .= '<input'.(in_array($prerequisiteId, [$item['id'], $item['ref']]) ? ' checked="checked" ' : '').($item['item_type'] == 'dir' ? ' disabled="disabled" ' : ' ').'id="id'.$item['id'].'" name="prerequisites"  type="radio" value="'.$item['id'].'" />';
+            $return .= '<input'.(in_array($prerequisiteId, [$item['id'], $item['ref']]) ? ' checked="checked" ' : '').('dir' == $item['item_type'] ? ' disabled="disabled" ' : ' ').'id="id'.$item['id'].'" name="prerequisites"  type="radio" value="'.$item['id'].'" />';
 
             $icon_name = str_replace(' ', '', $item['item_type']);
 
@@ -9772,7 +9773,7 @@ class learnpath
             $return .= '</div>';
             $return .= '</td>';
 
-            if ($item['item_type'] == TOOL_QUIZ) {
+            if (TOOL_QUIZ == $item['item_type']) {
                 // lets update max_score Tests information depending of the Tests Advanced properties
                 $lpItemObj = new LpItem($course_id, $item['id']);
                 $exercise = new Exercise($course_id);
@@ -9813,7 +9814,7 @@ class learnpath
                 $return .= '</td>';
             }
 
-            if ($item['item_type'] == TOOL_HOTPOTATOES) {
+            if (TOOL_HOTPOTATOES == $item['item_type']) {
                 $return .= '<td>';
                 $return .= '<input
                     size="4"
@@ -10016,7 +10017,7 @@ class learnpath
 
         $tbl_quiz = Database::get_course_table(TABLE_QUIZ_TEST);
         $condition_session = api_get_session_condition($session_id, true, true);
-        $setting = api_get_setting('lp.show_invisible_exercise_in_lp_toc') === 'true';
+        $setting = 'true' === api_get_setting('lp.show_invisible_exercise_in_lp_toc');
 
         $activeCondition = ' active <> -1 ';
         if ($setting) {
@@ -10131,7 +10132,7 @@ class learnpath
                 Security::remove_XSS(cut($title, 80)).$link.$sessionStar,
                 api_get_self().'?'.api_get_cidreq().'&action=add_item&type='.TOOL_QUIZ.'&file='.$row_quiz['id'].'&lp_id='.$this->lp_id,
                 [
-                    'class' => $visibility === false ? 'moved text-muted' : 'moved',
+                    'class' => false === $visibility ? 'moved text-muted' : 'moved',
                 ]
             );
             $return .= '</li>';
@@ -10192,7 +10193,7 @@ class learnpath
         $categories = [];
 
         foreach ($links as $link) {
-            $categoryId = $link->getCategory() !== null ? $link->getCategory()->getIid() : 0;
+            $categoryId = null !== $link->getCategory() ? $link->getCategory()->getIid() : 0;
 
             if (empty($categoryId)) {
                 $categories[0] = get_lang('Uncategorized');
@@ -10473,7 +10474,7 @@ class learnpath
             // Cleanup: Check the temp dir for old files and delete them.
             $handle = opendir($temp_zip_dir);
             while (false !== ($file = readdir($handle))) {
-                if ($file != '.' && $file != '..') {
+                if ('.' != $file && '..' != $file) {
                     unlink("$temp_zip_dir/$file");
                 }
             }
@@ -10484,7 +10485,7 @@ class learnpath
             is_file($current_course_path.'/scorm/'.$this->path.'/imsmanifest.xml')
         ) {
             // Remove the possible . at the end of the path.
-            $dest_path_to_lp = substr($this->path, -1) == '.' ? substr($this->path, 0, -1) : $this->path;
+            $dest_path_to_lp = '.' == substr($this->path, -1) ? substr($this->path, 0, -1) : $this->path;
             $dest_path_to_scorm_folder = str_replace('//', '/', $temp_zip_dir.'/scorm/'.$dest_path_to_lp);
             mkdir(
                 $dest_path_to_scorm_folder,
@@ -10551,7 +10552,7 @@ class learnpath
         }
 
         // Fixes chamilo scorm exports
-        if ($this->ref === 'chamilo_scorm_export') {
+        if ('chamilo_scorm_export' === $this->ref) {
             $path_to_remove = 'scorm/'.$this->path.'/document/';
         }
 
@@ -10563,7 +10564,7 @@ class learnpath
             $item = $this->items[$itemId];
             if (!in_array($item->type, [TOOL_QUIZ, TOOL_FORUM, TOOL_THREAD, TOOL_LINK, TOOL_STUDENTPUBLICATION])) {
                 // Get included documents from this item.
-                if ($item->type === 'sco') {
+                if ('sco' === $item->type) {
                     $inc_docs = $item->get_resources_from_source(
                         null,
                         $current_course_path.'/scorm/'.$this->path.'/'.$item->get_path()
@@ -10606,7 +10607,7 @@ class learnpath
                 $my_item->appendChild($my_masteryscore);
 
                 // Attach this item to the organization element or hits parent if there is one.
-                if (!empty($item->parent) && $item->parent != 0) {
+                if (!empty($item->parent) && 0 != $item->parent) {
                     $children = $organization->childNodes;
                     $possible_parent = $this->get_scorm_xml_node($children, 'ITEM_'.$item->parent);
                     if (is_object($possible_parent)) {
@@ -10631,7 +10632,7 @@ class learnpath
                     $my_xml_file_path = str_replace($path_to_remove, $path_to_replace, $my_file_path);
 
                     // From quiz
-                    if ($this->ref === 'chamilo_scorm_export') {
+                    if ('chamilo_scorm_export' === $this->ref) {
                         $path_to_remove = 'scorm/'.$this->path.'/';
                         $my_xml_file_path = str_replace($path_to_remove, '', $my_file_path);
                     }
@@ -10646,7 +10647,7 @@ class learnpath
                 $my_resource->setAttribute('type', 'webcontent');
                 $my_resource->setAttribute('href', $my_xml_file_path);
                 // adlcp:scormtype can be either 'sco' or 'asset'.
-                if ($item->type === 'sco') {
+                if ('sco' === $item->type) {
                     $my_resource->setAttribute('adlcp:scormtype', 'sco');
                 } else {
                     $my_resource->setAttribute('adlcp:scormtype', 'asset');
@@ -10672,11 +10673,11 @@ class learnpath
                         $my_dep->setAttribute('adlcp:scormtype', 'asset');
                         $my_dep_file = $xmldoc->createElement('file');
                         // Check type of URL.
-                        if ($doc_info[1] == 'remote') {
+                        if ('remote' == $doc_info[1]) {
                             // Remote file. Save url as is.
                             $my_dep_file->setAttribute('href', $doc_info[0]);
                             $my_dep->setAttribute('xml:base', '');
-                        } elseif ($doc_info[1] === 'local') {
+                        } elseif ('local' === $doc_info[1]) {
                             switch ($doc_info[2]) {
                                 case 'url':
                                     // Local URL - save path as url for now, don't zip file.
@@ -10688,16 +10689,16 @@ class learnpath
                                     $file_path = str_replace('\\', '/', $file_path);
                                     $my_dep_file->setAttribute('href', $file_path);
                                     $my_dep->setAttribute('xml:base', '');
-                                    if (strstr($file_path, $main_path) !== false) {
+                                    if (false !== strstr($file_path, $main_path)) {
                                         // The calculated real path is really inside Chamilo's root path.
                                         // Reduce file path to what's under the DocumentRoot.
                                         $replace = $file_path;
                                         $file_path = substr($file_path, strlen($root_path) - 1);
                                         $destinationFile = $file_path;
 
-                                        if (strstr($file_path, 'upload/users') !== false) {
+                                        if (false !== strstr($file_path, 'upload/users')) {
                                             $pos = strpos($file_path, 'my_files/');
-                                            if ($pos !== false) {
+                                            if (false !== $pos) {
                                                 $onlyDirectory = str_replace(
                                                     'upload/users/',
                                                     '',
@@ -10741,7 +10742,7 @@ class learnpath
                                     $abs_img_path_without_subdir = $doc_info[0];
                                     $relp = api_get_path(REL_PATH); // The url-append config param.
                                     $pos = strpos($abs_img_path_without_subdir, $relp);
-                                    if ($pos === 0) {
+                                    if (0 === $pos) {
                                         $abs_img_path_without_subdir = trim('/'.substr($abs_img_path_without_subdir, strlen($relp)));
                                     }
 
@@ -10749,9 +10750,9 @@ class learnpath
                                     $file_path = str_replace(['\\', '//'], '/', $file_path);
 
                                     // Prepare the current directory path (until just under 'document') with a trailing slash.
-                                    $cur_path = substr($current_course_path, -1) == '/' ? $current_course_path : $current_course_path.'/';
+                                    $cur_path = '/' == substr($current_course_path, -1) ? $current_course_path : $current_course_path.'/';
                                     // Check if the current document is in that path.
-                                    if (strstr($file_path, $cur_path) !== false) {
+                                    if (false !== strstr($file_path, $cur_path)) {
                                         $destinationFile = substr($file_path, strlen($cur_path));
                                         $filePathNoCoursePart = substr($file_path, strlen($cur_path));
 
@@ -10779,7 +10780,7 @@ class learnpath
 
                                         $my_dep_file->setAttribute('href', $file_path);
                                         $my_dep->setAttribute('xml:base', '');
-                                    } elseif (strstr($file_path, $main_path) !== false) {
+                                    } elseif (false !== strstr($file_path, $main_path)) {
                                         // The calculated real path is really inside Chamilo's root path.
                                         // Reduce file path to what's under the DocumentRoot.
                                         $file_path = substr($file_path, strlen($root_path));
@@ -10793,10 +10794,10 @@ class learnpath
                                         $abs_path = api_get_path(SYS_PATH).str_replace(api_get_path(WEB_PATH), '', $doc_info[0]);
 
                                         if (file_exists($file_path)) {
-                                            if (strstr($file_path, 'main/default_course_document') !== false) {
+                                            if (false !== strstr($file_path, 'main/default_course_document')) {
                                                 // We get the relative path.
                                                 $pos = strpos($file_path, 'main/default_course_document/');
-                                                if ($pos !== false) {
+                                                if (false !== $pos) {
                                                     $onlyDirectory = str_replace(
                                                         'main/default_course_document/',
                                                         '',
@@ -10820,13 +10821,13 @@ class learnpath
                                 case 'rel':
                                     // Path relative to the current document.
                                     // Save xml:base as current document's directory and save file in zip as subdir.file_path
-                                    if (substr($doc_info[0], 0, 2) === '..') {
+                                    if ('..' === substr($doc_info[0], 0, 2)) {
                                         // Relative path going up.
                                         $current_dir = dirname($current_course_path.'/'.$item->get_file_path()).'/';
                                         $current_dir = str_replace('\\', '/', $current_dir);
                                         $file_path = realpath($current_dir.$doc_info[0]);
                                         $file_path = str_replace('\\', '/', $file_path);
-                                        if (strstr($file_path, $main_path) !== false) {
+                                        if (false !== strstr($file_path, $main_path)) {
                                             // The calculated real path is really inside Chamilo's root path.
                                             // Reduce file path to what's under the DocumentRoot.
                                             $file_path = substr($file_path, strlen($root_path));
@@ -10890,11 +10891,11 @@ class learnpath
                         $my_item->appendChild($my_masteryscore);
 
                         // Attach this item to the organization element or its parent if there is one.
-                        if (!empty($item->parent) && $item->parent != 0) {
+                        if (!empty($item->parent) && 0 != $item->parent) {
                             $children = $organization->childNodes;
                             for ($i = 0; $i < $children->length; $i++) {
                                 $item_temp = $children->item($i);
-                                if ($item_temp->nodeName == 'item') {
+                                if ('item' == $item_temp->nodeName) {
                                     if ($item_temp->getAttribute('identifier') == 'ITEM_'.$item->parent) {
                                         $item_temp->appendChild($my_item);
                                     }
@@ -10962,7 +10963,7 @@ class learnpath
                         $my_item->appendChild($my_masteryscore);
 
                         // Attach this item to the organization element or hits parent if there is one.
-                        if (!empty($item->parent) && $item->parent != 0) {
+                        if (!empty($item->parent) && 0 != $item->parent) {
                             $children = $organization->childNodes;
                             $possible_parent = $this->get_scorm_xml_node($children, 'ITEM_'.$item->parent);
                             if ($possible_parent) {
@@ -10984,7 +10985,7 @@ class learnpath
 
                         $tmp_file_path = $archivePath.$temp_dir_short.'/'.$my_file_path;
                         $res = file_put_contents($tmp_file_path, $contents);
-                        if ($res === false) {
+                        if (false === $res) {
                             error_log('Could not write into file '.$tmp_file_path.' '.__FILE__.' '.__LINE__, 0);
                         }
                         $files_cleanup[] = $tmp_file_path;
@@ -11022,11 +11023,11 @@ class learnpath
                             $my_dep->setAttribute('adlcp:scormtype', 'asset');
                             $my_dep_file = $xmldoc->createElement('file');
                             // Check type of URL.
-                            if ($doc_info[1] == 'remote') {
+                            if ('remote' == $doc_info[1]) {
                                 // Remote file. Save url as is.
                                 $my_dep_file->setAttribute('href', $doc_info[0]);
                                 $my_dep->setAttribute('xml:base', '');
-                            } elseif ($doc_info[1] == 'local') {
+                            } elseif ('local' == $doc_info[1]) {
                                 switch ($doc_info[2]) {
                                     case 'url': // Local URL - save path as url for now, don't zip file.
                                         // Save file but as local file (retrieve from URL).
@@ -11038,7 +11039,7 @@ class learnpath
                                         $file_path = str_replace('\\', '/', $file_path);
                                         $my_dep_file->setAttribute('href', 'document/'.$file_path);
                                         $my_dep->setAttribute('xml:base', '');
-                                        if (strstr($file_path, $main_path) !== false) {
+                                        if (false !== strstr($file_path, $main_path)) {
                                             // The calculated real path is really inside the chamilo root path.
                                             // Reduce file path to what's under the DocumentRoot.
                                             $file_path = substr($file_path, strlen($root_path));
@@ -11074,7 +11075,7 @@ class learnpath
                                         $my_dep_file->setAttribute('href', $file_path);
                                         $my_dep->setAttribute('xml:base', '');
 
-                                        if (strstr($file_path, $main_path) !== false) {
+                                        if (false !== strstr($file_path, $main_path)) {
                                             // The calculated real path is really inside the chamilo root path.
                                             // Reduce file path to what's under the DocumentRoot.
                                             $file_path = substr($file_path, strlen($root_path));
@@ -11114,13 +11115,13 @@ class learnpath
                                     case 'rel':
                                         // Path relative to the current document. Save xml:base as current document's
                                         // directory and save file in zip as subdir.file_path
-                                        if (substr($doc_info[0], 0, 2) === '..') {
+                                        if ('..' === substr($doc_info[0], 0, 2)) {
                                             // Relative path going up.
                                             $current_dir = dirname($current_course_path.'/'.$item->get_file_path()).'/';
                                             $current_dir = str_replace('\\', '/', $current_dir);
                                             $file_path = realpath($current_dir.$doc_info[0]);
                                             $file_path = str_replace('\\', '/', $file_path);
-                                            if (strstr($file_path, $main_path) !== false) {
+                                            if (false !== strstr($file_path, $main_path)) {
                                                 // The calculated real path is really inside Chamilo's root path.
                                                 // Reduce file path to what's under the DocumentRoot.
 
@@ -11129,7 +11130,7 @@ class learnpath
 
                                                 // File path is courses/CHAMILO/document/....
                                                 $info_file_path = explode('/', $file_path);
-                                                if ($info_file_path[0] == 'courses') {
+                                                if ('courses' == $info_file_path[0]) {
                                                     // Add character "/" in file path.
                                                     $file_path_dest = 'document/'.$file_path;
                                                 }
@@ -11224,18 +11225,18 @@ class learnpath
                     // will be added in document/main/inc/lib/flv_player/flv_player.swf and that needs
                     // to find the flv to play in document/main/, so we replace main/ in the flv path by
                     // ../../.. to return from inc/lib/flv_player to the document/main path.
-                    if (substr($old_new['dest'], -3) === 'flv' &&
-                        substr($old_new['dest'], 0, 5) === 'main/'
+                    if ('flv' === substr($old_new['dest'], -3) &&
+                        'main/' === substr($old_new['dest'], 0, 5)
                     ) {
                         $old_new['dest'] = str_replace('main/', '../../../', $old_new['dest']);
-                    } elseif (substr($old_new['dest'], -3) === 'flv' &&
-                        substr($old_new['dest'], 0, 6) === 'video/'
+                    } elseif ('flv' === substr($old_new['dest'], -3) &&
+                        'video/' === substr($old_new['dest'], 0, 6)
                     ) {
                         $old_new['dest'] = str_replace('video/', '../../../../video/', $old_new['dest']);
                     }
 
                     // Fix to avoid problems with default_course_document
-                    if (strpos('main/default_course_document', $old_new['dest']) === false) {
+                    if (false === strpos('main/default_course_document', $old_new['dest'])) {
                         $newDestination = $old_new['dest'];
                         if (isset($old_new['replace']) && !empty($old_new['replace'])) {
                             $newDestination = $old_new['replace'];
@@ -11296,9 +11297,9 @@ class learnpath
             }
 
             $dest_file = $archivePath.$temp_dir_short.'/document/'.$file_path;
-            if (strstr($file_path, 'upload/users') !== false) {
+            if (false !== strstr($file_path, 'upload/users')) {
                 $pos = strpos($file_path, 'my_files/');
-                if ($pos !== false) {
+                if (false !== $pos) {
                     $onlyDirectory = str_replace(
                         'upload/users/',
                         '',
@@ -11308,7 +11309,7 @@ class learnpath
                 }
             }
 
-            if (strstr($file_path, 'default_course_document/') !== false) {
+            if (false !== strstr($file_path, 'default_course_document/')) {
                 $replace = str_replace('/main', '', $file_path);
                 $dest_file = $archivePath.$temp_dir_short.'/document/'.$replace;
             }
@@ -11328,8 +11329,8 @@ class learnpath
                     // will be added in document/main/inc/lib/flv_player/flv_player.swf and that needs
                     // to find the flv to play in document/main/, so we replace main/ in the flv path by
                     // ../../.. to return from inc/lib/flv_player to the document/main path.
-                    if (substr($old_new['dest'], -3) == 'flv' &&
-                        substr($old_new['dest'], 0, 5) == 'main/'
+                    if ('flv' == substr($old_new['dest'], -3) &&
+                        'main/' == substr($old_new['dest'], 0, 5)
                     ) {
                         $old_new['dest'] = str_replace('main/', '../../../', $old_new['dest']);
                     }
@@ -11411,7 +11412,7 @@ EOD;
         // Clean possible temporary files.
         foreach ($files_cleanup as $file) {
             $res = unlink($file);
-            if ($res === false) {
+            if (false === $res) {
                 error_log(
                     'Could not delete temp file '.$file.' '.__FILE__.' '.__LINE__,
                     0
@@ -11532,7 +11533,7 @@ EOD;
     public function delete_lp_image()
     {
         $img = $this->get_preview_image();
-        if ($img != '') {
+        if ('' != $img) {
             $del_file = $this->get_preview_image_path(null, 'sys');
             if (isset($del_file) && file_exists($del_file)) {
                 $del_file_2 = $this->get_preview_image_path(64, 'sys');
@@ -11617,7 +11618,7 @@ EOD;
             ],
         ];
         Database::update($lp_table, $attributes, $where);
-        if ($status == 1) {
+        if (1 == $status) {
             //Setting my lp_id to autolaunch = 1
             $attributes['autolaunch'] = 1;
             $where = [
@@ -11704,15 +11705,15 @@ EOD;
     public static function verify_document_size($s)
     {
         $post_max = ini_get('post_max_size');
-        if (substr($post_max, -1, 1) == 'M') {
+        if ('M' == substr($post_max, -1, 1)) {
             $post_max = intval(substr($post_max, 0, -1)) * 1024 * 1024;
-        } elseif (substr($post_max, -1, 1) == 'G') {
+        } elseif ('G' == substr($post_max, -1, 1)) {
             $post_max = intval(substr($post_max, 0, -1)) * 1024 * 1024 * 1024;
         }
         $upl_max = ini_get('upload_max_filesize');
-        if (substr($upl_max, -1, 1) == 'M') {
+        if ('M' == substr($upl_max, -1, 1)) {
             $upl_max = intval(substr($upl_max, 0, -1)) * 1024 * 1024;
-        } elseif (substr($upl_max, -1, 1) == 'G') {
+        } elseif ('G' == substr($upl_max, -1, 1)) {
             $upl_max = intval(substr($upl_max, 0, -1)) * 1024 * 1024 * 1024;
         }
 
@@ -11766,9 +11767,9 @@ EOD;
                 // if there was a previous item... (otherwise jump to set it)
                 if (!empty($previous_item_id)) {
                     $current_item_id = $item->get_id(); //save current id
-                    if ($item->get_type() != 'dir') {
+                    if ('dir' != $item->get_type()) {
                         // Current item is not a folder, so it qualifies to get a prerequisites
-                        if ($last_item_not_dir_type == 'quiz') {
+                        if ('quiz' == $last_item_not_dir_type) {
                             // if previous is quiz, mark its max score as default score to be achieved
                             $sql = "UPDATE $tbl_lp_item SET mastery_score = '$last_item_not_dir_max'
                                     WHERE c_id = $course_id AND lp_id = $lp_id AND iid = $last_item_not_dir";
@@ -11784,7 +11785,7 @@ EOD;
                         $last_item_not_dir_max = $item->get_max();
                     }
                 } else {
-                    if ($item->get_type() != 'dir') {
+                    if ('dir' != $item->get_type()) {
                         // Current item is not a folder (but it is the first item) so record as last "non-chapter" item
                         $last_item_not_dir = $item->get_id();
                         $last_item_not_dir_type = $item->get_type();
@@ -12054,7 +12055,7 @@ EOD;
         $debug = 0;
         $learnPath = null;
         $lpObject = Session::read('lpobject');
-        if ($lpObject !== null) {
+        if (null !== $lpObject) {
             $learnPath = UnserializeApi::unserialize('lp', $lpObject);
             if ($debug) {
                 error_log('getLpFromSession: unserialize');
@@ -12267,7 +12268,7 @@ EOD;
     {
         $exercises = [];
         foreach ($this->items as $item) {
-            if ($item->type != 'quiz') {
+            if ('quiz' != $item->type) {
                 continue;
             }
             $exercises[] = $item;
@@ -12287,7 +12288,7 @@ EOD;
     {
         $exercises = [];
         foreach ($this->items as $item) {
-            if ($item->type != 'quiz') {
+            if ('quiz' != $item->type) {
                 continue;
             }
 
@@ -12312,7 +12313,7 @@ EOD;
         $totalExercisesResult = 0;
         $totalEvaluationResult = 0;
 
-        if ($exercisesItems !== false) {
+        if (false !== $exercisesItems) {
             foreach ($exercisesItems as $exerciseItem) {
                 $exerciseResultInfo = Event::getExerciseResultsByUser(
                     $this->user_id,
@@ -12365,7 +12366,7 @@ EOD;
         $urlInfo = parse_url($src);
 
         $platformProtocol = 'https';
-        if (strpos(api_get_path(WEB_CODE_PATH), 'https') === false) {
+        if (false === strpos(api_get_path(WEB_CODE_PATH), 'https')) {
             $platformProtocol = 'http';
         }
 
@@ -12380,8 +12381,8 @@ EOD;
             $protocolFixApplied = true;
         }
 
-        if ($protocolFixApplied == false) {
-            if (strpos(api_get_path(WEB_PATH), $host) === false) {
+        if (false == $protocolFixApplied) {
+            if (false === strpos(api_get_path(WEB_PATH), $host)) {
                 // Check X-Frame-Options
                 $ch = curl_init();
                 $options = [
@@ -13071,10 +13072,10 @@ EOD;
                         $origParseUrl = parse_url($url);
                         $realOrigPath = isset($origParseUrl['path']) ? $origParseUrl['path'] : null;
 
-                        if ($scope == 'local') {
-                            if ($type == 'abs' || $type == 'rel') {
+                        if ('local' == $scope) {
+                            if ('abs' == $type || 'rel' == $type) {
                                 $documentFile = strstr($realOrigPath, 'document');
-                                if (strpos($realOrigPath, $documentFile) !== false) {
+                                if (false !== strpos($realOrigPath, $documentFile)) {
                                     $documentFile = str_replace('document', '', $documentFile);
                                     $itemDocumentId = DocumentManager::get_document_id($courseInfo, $documentFile);
                                     // Document found! Add it to the list
@@ -13462,7 +13463,7 @@ EOD;
             $parentItemId = $items[$currentItemId]->parent;
         }
 
-        if ($parentItemId == 0) {
+        if (0 == $parentItemId) {
             return 0;
         } else {
             return self::get_level_for_item($items, $parentItemId) + 1;
@@ -13515,7 +13516,7 @@ EOD;
         }
 
         foreach ($this->items as $item) {
-            if ($item->type !== 'final_item') {
+            if ('final_item' !== $item->type) {
                 continue;
             }
 
diff --git a/public/main/lp/learnpathItem.class.php b/public/main/lp/learnpathItem.class.php
index c9044b5896..2eae82cbf7 100644
--- a/public/main/lp/learnpathItem.class.php
+++ b/public/main/lp/learnpathItem.class.php
@@ -9,8 +9,6 @@ use Chamilo\CoreBundle\Framework\Container;
  * a score, a use time and additional information that enables tracking a user's
  * progress in a learning path.
  *
- * @package chamilo.learnpath
- *
  * @author  Yannick Warnier <ywarnier@beeznest.org>
  */
 class learnpathItem
@@ -169,7 +167,7 @@ class learnpathItem
             }
 
             // Get search_did.
-            if (api_get_setting('search_enabled') == 'true') {
+            if ('true' == api_get_setting('search_enabled')) {
                 $tbl_se_ref = Database::get_main_table(TABLE_MAIN_SEARCH_ENGINE_REF);
                 $sql = 'SELECT *
                         FROM %s
@@ -268,8 +266,8 @@ class learnpathItem
         }
         $this->current_stop_time = time();
         $type = $this->get_type();
-        if ($type != 'sco') {
-            if ($type == TOOL_QUIZ || $type == TOOL_HOTPOTATOES) {
+        if ('sco' != $type) {
+            if (TOOL_QUIZ == $type || TOOL_HOTPOTATOES == $type) {
                 $this->get_status(
                     true,
                     true
@@ -314,7 +312,7 @@ class learnpathItem
                 WHERE iid = ".$this->db_id;
         Database::query($sql);
 
-        if (api_get_setting('search_enabled') == 'true') {
+        if ('true' == api_get_setting('search_enabled')) {
             if (!is_null($this->search_did)) {
                 $di = new ChamiloIndexer();
                 $di->remove_document($this->search_did);
@@ -398,7 +396,7 @@ class learnpathItem
         // Now check the value of prevent_reinit (if it's 0, return credit as
         // the default was).
         // If prevent_reinit == 1 (or more).
-        if ($this->get_prevent_reinit() != 0) {
+        if (0 != $this->get_prevent_reinit()) {
             // If status is not attempted or incomplete, credit anyway.
             // Otherwise:
             // Check the status in the database rather than in the object, as
@@ -473,7 +471,7 @@ class learnpathItem
         $type = $this->get_type();
 
         if (empty($path)) {
-            if ($type == 'dir') {
+            if ('dir' == $type) {
                 return '';
             } else {
                 return '-1';
@@ -711,7 +709,7 @@ class learnpathItem
     public function get_lesson_mode()
     {
         $mode = 'normal';
-        if ($this->get_prevent_reinit() != 0) {
+        if (0 != $this->get_prevent_reinit()) {
             // If prevent_reinit == 0
             $my_status = $this->get_status();
             if ($my_status != $this->possible_status[0] && $my_status != $this->possible_status[1]) {
@@ -755,14 +753,14 @@ class learnpathItem
      */
     public function get_max()
     {
-        if ($this->type == 'sco') {
+        if ('sco' == $this->type) {
             if (isset($this->view_max_score) &&
                 !empty($this->view_max_score) &&
                 $this->view_max_score > 0
             ) {
                 return $this->view_max_score;
             } elseif (isset($this->view_max_score) &&
-                $this->view_max_score === ''
+                '' === $this->view_max_score
             ) {
                 return $this->view_max_score;
             } else {
@@ -1023,7 +1021,7 @@ class learnpathItem
                                     if (strpos($source, "+this.")) {
                                         continue;
                                     } // javascript code - will still work unaltered.
-                                    if (strpos($source, '.') === false) {
+                                    if (false === strpos($source, '.')) {
                                         continue;
                                     } // No dot, should not be an external file anyway.
                                     if (strpos($source, 'mailto:')) {
@@ -1035,7 +1033,7 @@ class learnpathItem
                                         continue;
                                     } // Avoid code - that should help.
 
-                                    if ($attr == 'value') {
+                                    if ('value' == $attr) {
                                         if (strpos($source, 'mp3file')) {
                                             $files_list[] = [
                                                 substr(
@@ -1056,7 +1054,7 @@ class learnpathItem
                                                     'mp3file='
                                                 ) + 8
                                             );
-                                            if (substr($mp3file, 0, 1) == '/') {
+                                            if ('/' == substr($mp3file, 0, 1)) {
                                                 $files_list[] = [
                                                     $mp3file,
                                                     'local',
@@ -1069,7 +1067,7 @@ class learnpathItem
                                                     'rel',
                                                 ];
                                             }
-                                        } elseif (strpos($source, 'flv=') === 0) {
+                                        } elseif (0 === strpos($source, 'flv=')) {
                                             $source = substr($source, 4);
                                             if (strpos($source, '&') > 0) {
                                                 $source = substr(
@@ -1079,7 +1077,7 @@ class learnpathItem
                                                 );
                                             }
                                             if (strpos($source, '://') > 0) {
-                                                if (strpos($source, api_get_path(WEB_PATH)) !== false) {
+                                                if (false !== strpos($source, api_get_path(WEB_PATH))) {
                                                     // We found the current portal url.
                                                     $files_list[] = [
                                                         $source,
@@ -1129,7 +1127,7 @@ class learnpathItem
                                                     $pos1 + 1,
                                                     $pos2 - ($pos1 + 1)
                                                 );
-                                                if (strpos($second_part, api_get_path(WEB_PATH)) !== false) {
+                                                if (false !== strpos($second_part, api_get_path(WEB_PATH))) {
                                                     // We found the current portal url.
                                                     $files_list[] = [
                                                         $second_part,
@@ -1156,7 +1154,7 @@ class learnpathItem
                                                     ];
                                                 }
                                             } elseif (strpos($second_part, '=') > 0) {
-                                                if (substr($second_part, 0, 1) === '/') {
+                                                if ('/' === substr($second_part, 0, 1)) {
                                                     // Link starts with a /,
                                                     // making it absolute (relative to DocumentRoot).
                                                     $files_list[] = [
@@ -1175,7 +1173,7 @@ class learnpathItem
                                                             $in_files_list
                                                         );
                                                     }
-                                                } elseif (strstr($second_part, '..') === 0) {
+                                                } elseif (0 === strstr($second_part, '..')) {
                                                     // Link is relative but going back in the hierarchy.
                                                     $files_list[] = [
                                                         $second_part,
@@ -1201,7 +1199,7 @@ class learnpathItem
                                                     }
                                                 } else {
                                                     // No starting '/', making it relative to current document's path.
-                                                    if (substr($second_part, 0, 2) == './') {
+                                                    if ('./' == substr($second_part, 0, 2)) {
                                                         $second_part = substr(
                                                             $second_part,
                                                             2
@@ -1238,7 +1236,7 @@ class learnpathItem
                                                 strpos($source, '?')
                                             );
                                             if (strpos($source, '://') > 0) {
-                                                if (strpos($source, api_get_path(WEB_PATH)) !== false) {
+                                                if (false !== strpos($source, api_get_path(WEB_PATH))) {
                                                     // We found the current portal url.
                                                     $files_list[] = [
                                                         $source,
@@ -1266,7 +1264,7 @@ class learnpathItem
                                                 }
                                             } else {
                                                 // No protocol found, make link local.
-                                                if (substr($source, 0, 1) === '/') {
+                                                if ('/' === substr($source, 0, 1)) {
                                                     // Link starts with a /, making it absolute (relative to DocumentRoot).
                                                     $files_list[] = [
                                                         $source,
@@ -1284,7 +1282,7 @@ class learnpathItem
                                                             $in_files_list
                                                         );
                                                     }
-                                                } elseif (strstr($source, '..') === 0) {
+                                                } elseif (0 === strstr($source, '..')) {
                                                     // Link is relative but going back in the hierarchy.
                                                     $files_list[] = [
                                                         $source,
@@ -1310,7 +1308,7 @@ class learnpathItem
                                                     }
                                                 } else {
                                                     // No starting '/', making it relative to current document's path.
-                                                    if (substr($source, 0, 2) == './') {
+                                                    if ('./' == substr($source, 0, 2)) {
                                                         $source = substr(
                                                             $source,
                                                             2
@@ -1343,7 +1341,7 @@ class learnpathItem
                                         }
 
                                         // Found some protocol there.
-                                        if (strpos($source, api_get_path(WEB_PATH)) !== false) {
+                                        if (false !== strpos($source, api_get_path(WEB_PATH))) {
                                             // We found the current portal url.
                                             $files_list[] = [
                                                 $source,
@@ -1371,7 +1369,7 @@ class learnpathItem
                                         }
                                     } else {
                                         // No protocol found, make link local.
-                                        if (substr($source, 0, 1) === '/') {
+                                        if ('/' === substr($source, 0, 1)) {
                                             // Link starts with a /, making it absolute (relative to DocumentRoot).
                                             $files_list[] = [
                                                 $source,
@@ -1389,7 +1387,7 @@ class learnpathItem
                                                     $in_files_list
                                                 );
                                             }
-                                        } elseif (strstr($source, '..') === 0) {
+                                        } elseif (0 === strstr($source, '..')) {
                                             // Link is relative but going back in the hierarchy.
                                             $files_list[] = [
                                                 $source,
@@ -1419,7 +1417,7 @@ class learnpathItem
                                                 continue;
                                             }
 
-                                            if (substr($source, 0, 2) == './') {
+                                            if ('./' == substr($source, 0, 2)) {
                                                 $source = substr(
                                                     $source,
                                                     2
@@ -1518,7 +1516,7 @@ class learnpathItem
                             iid = '".$this->db_item_view_id."' AND
                             view_count = '".$this->get_attempt_id()."'";
                 $res = Database::query($sql);
-                if (Database::num_rows($res) == 1) {
+                if (1 == Database::num_rows($res)) {
                     $row = Database::fetch_array($res);
                     if ($update_local) {
                         $this->set_status($row['status']);
@@ -1566,7 +1564,7 @@ class learnpathItem
     ) {
         $h = get_lang('h');
         if (!isset($time)) {
-            if ($origin == 'js') {
+            if ('js' == $origin) {
                 return '00 : 00: 00';
             }
 
@@ -1600,7 +1598,7 @@ class learnpathItem
                     0
                 );
             }
-            if ($query_db === true) {
+            if (true === $query_db) {
                 $table = Database::get_course_table(TABLE_LP_ITEM_VIEW);
                 $sql = "SELECT start_time, total_time
                         FROM $table
@@ -1683,7 +1681,7 @@ class learnpathItem
                 0
             );
         }
-        if ($this->current_start_time == 0) {
+        if (0 == $this->current_start_time) {
             // Shouldn't be necessary thanks to the open() method.
             if ($debug) {
                 error_log(
@@ -1695,7 +1693,7 @@ class learnpathItem
         }
 
         if (time() < $this->current_stop_time ||
-            $this->current_stop_time == 0
+            0 == $this->current_stop_time
         ) {
             if ($debug) {
                 error_log(
@@ -1923,7 +1921,7 @@ class learnpathItem
         if (self::DEBUG > 0) {
             error_log('learnpathItem::open()', 0);
         }
-        if ($this->prevent_reinit == 0) {
+        if (0 == $this->prevent_reinit) {
             $this->current_score = 0;
             $this->current_start_time = time();
             // In this case, as we are opening the item, what is important to us
@@ -2000,11 +1998,11 @@ class learnpathItem
 
         // First parse all parenthesis by using a sequential loop
         //  (looking for less-inclusives first).
-        if ($prereqs_string == '_true_') {
+        if ('_true_' == $prereqs_string) {
             return true;
         }
 
-        if ($prereqs_string == '_false_') {
+        if ('_false_' == $prereqs_string) {
             if (empty($this->prereq_alert)) {
                 $this->prereq_alert = get_lang('This learning object cannot display because the course prerequisites are not completed. This happens when a course imposes that you follow it step by step or get a minimum score in tests before you reach the next steps.');
             }
@@ -2012,7 +2010,7 @@ class learnpathItem
             return false;
         }
 
-        while (strpos($prereqs_string, '(') !== false) {
+        while (false !== strpos($prereqs_string, '(')) {
             // Remove any () set and replace with its value.
             $matches = [];
             $res = preg_match_all(
@@ -2047,11 +2045,11 @@ class learnpathItem
 
         // Parenthesis removed, now look for ORs as it is the lesser-priority
         //  binary operator (= always uses one text operand).
-        if (strpos($prereqs_string, '|') === false) {
+        if (false === strpos($prereqs_string, '|')) {
             if ($debug) {
                 error_log('New LP - Didnt find any OR, looking for AND', 0);
             }
-            if (strpos($prereqs_string, '&') !== false) {
+            if (false !== strpos($prereqs_string, '&')) {
                 $list = explode('&', $prereqs_string);
                 if (count($list) > 1) {
                     $andstatus = true;
@@ -2099,13 +2097,13 @@ class learnpathItem
                     error_log('New LP - Didnt find any AND, looking for =', 0);
                 }
 
-                if (strpos($prereqs_string, '=') !== false) {
+                if (false !== strpos($prereqs_string, '=')) {
                     if ($debug) {
                         error_log('New LP - Found =, looking into it', 0);
                     }
                     // We assume '=' signs only appear when there's nothing else around.
                     $params = explode('=', $prereqs_string);
-                    if (count($params) == 2) {
+                    if (2 == count($params)) {
                         // Right number of operands.
                         if (isset($items[$refs_list[$params[0]]])) {
                             $status = $items[$refs_list[$params[0]]]->get_status(true);
@@ -2129,13 +2127,13 @@ class learnpathItem
                         );
                     }
 
-                    if (strpos($prereqs_string, '<>') !== false) {
+                    if (false !== strpos($prereqs_string, '<>')) {
                         if ($debug) {
                             error_log('New LP - Found <>, looking into it', 0);
                         }
                         // We assume '<>' signs only appear when there's nothing else around.
                         $params = explode('<>', $prereqs_string);
-                        if (count($params) == 2) {
+                        if (2 == count($params)) {
                             // Right number of operands.
                             if (isset($items[$refs_list[$params[0]]])) {
                                 $status = $items[$refs_list[$params[0]]]->get_status(true);
@@ -2159,7 +2157,7 @@ class learnpathItem
                             );
                         }
                         // Only remains: ~ and X*{}
-                        if (strpos($prereqs_string, '~') !== false) {
+                        if (false !== strpos($prereqs_string, '~')) {
                             // Found NOT.
                             if ($debug) {
                                 error_log(
@@ -2342,7 +2340,7 @@ class learnpathItem
                                     /** @var learnpathItem $itemToCheck */
                                     $itemToCheck = $items[$refs_list[$prereqs_string]];
 
-                                    if ($itemToCheck->type === 'quiz') {
+                                    if ('quiz' === $itemToCheck->type) {
                                         // 1. Checking the status in current items.
                                         $status = $itemToCheck->get_status(true);
                                         $returnstatus = $status == $this->possible_status[2] || $status == $this->possible_status[3];
@@ -2356,7 +2354,7 @@ class learnpathItem
                                         }
 
                                         // For one and first attempt.
-                                        if ($this->prevent_reinit == 1) {
+                                        if (1 == $this->prevent_reinit) {
                                             // 2. If is completed we check the results in the DB of the quiz.
                                             if ($returnstatus) {
                                                 $sql = 'SELECT score, max_score
@@ -2470,7 +2468,7 @@ class learnpathItem
                                             }
                                         }
 
-                                        if ($returnstatus === false) {
+                                        if (false === $returnstatus) {
                                             // Check results from another sessions.
                                             $checkOtherSessions = api_get_configuration_value('validate_lp_prerequisite_from_other_session');
                                             if ($checkOtherSessions) {
@@ -2483,7 +2481,7 @@ class learnpathItem
                                         }
 
                                         return $returnstatus;
-                                    } elseif ($itemToCheck->type === 'student_publication') {
+                                    } elseif ('student_publication' === $itemToCheck->type) {
                                         require_once api_get_path(SYS_CODE_PATH).'work/work.lib.php';
                                         $workId = $items[$refs_list[$prereqs_string]]->path;
                                         $count = get_work_count_by_student($user_id, $workId);
@@ -2520,7 +2518,7 @@ class learnpathItem
                                         $lp_item_view = Database::get_course_table(TABLE_LP_ITEM_VIEW);
                                         $lp_view = Database::get_course_table(TABLE_LP_VIEW);
 
-                                        if ($returnstatus && $this->prevent_reinit == 1) {
+                                        if ($returnstatus && 1 == $this->prevent_reinit) {
                                             $sql = "SELECT iid FROM $lp_view
                                                     WHERE
                                                         c_id = $course_id AND
@@ -2549,7 +2547,7 @@ class learnpathItem
                                                 }
                                             }
 
-                                            if ($checkOtherSessions && $returnstatus === false) {
+                                            if ($checkOtherSessions && false === $returnstatus) {
                                                 $returnstatus = $returnstatus = $this->getStatusFromOtherSessions(
                                                     $user_id,
                                                     $prereqs_string,
@@ -2611,7 +2609,7 @@ class learnpathItem
                 }
                 if (isset($items[$refs_list[$list[0]]])) {
                     $status = $items[$refs_list[$list[0]]]->get_status(true);
-                    $returnstatus = $status == 'completed' || $status == 'passed';
+                    $returnstatus = 'completed' == $status || 'passed' == $status;
                     if (!$returnstatus && empty($this->prereq_alert)) {
                         $this->prereq_alert = get_lang('This learning object cannot display because the course prerequisites are not completed. This happens when a course imposes that you follow it step by step or get a minimum score in tests before you reach the next steps.');
                     }
@@ -2646,7 +2644,7 @@ class learnpathItem
         }
         $seriousGame = $this->get_seriousgame_mode();
         //For serious game  : We reuse same attempt_id
-        if ($seriousGame == 1 && $this->type == 'sco') {
+        if (1 == $seriousGame && 'sco' == $this->type) {
             // If this is a sco, Chamilo can't update the time without an
             //  explicit scorm call
             $this->current_start_time = 0;
@@ -2659,9 +2657,9 @@ class learnpathItem
         $this->save();
 
         $allowed = $this->isRestartAllowed();
-        if ($allowed === -1) {
+        if (-1 === $allowed) {
             // Nothing allowed, do nothing.
-        } elseif ($allowed === 1) {
+        } elseif (1 === $allowed) {
             // Restart as new attempt is allowed, record a new attempt.
             $this->attempt_id = $this->attempt_id + 1; // Simply reuse the previous attempt_id.
             $this->current_score = 0;
@@ -2674,7 +2672,7 @@ class learnpathItem
             $this->objectives_count = 0;
             $this->objectives = [];
             $this->lesson_location = '';
-            if ($this->type != TOOL_QUIZ) {
+            if (TOOL_QUIZ != $this->type) {
                 $this->write_to_db();
             }
         } else {
@@ -2706,9 +2704,9 @@ class learnpathItem
         }
         // First check if parameters passed via GET can be saved here
         // in case it's a SCORM, we should get:
-        if ($this->type == 'sco' || $this->type == 'au') {
+        if ('sco' == $this->type || 'au' == $this->type) {
             $status = $this->get_status(true);
-            if ($this->prevent_reinit == 1 &&
+            if (1 == $this->prevent_reinit &&
                 $status != $this->possible_status[0] && // not attempted
                 $status != $this->possible_status[1]    //incomplete
             ) {
@@ -3027,7 +3025,7 @@ class learnpathItem
                         lp_iv_id = '".$this->db_item_view_id."'";
 
             $res = Database::query($sql);
-            if ($res !== false) {
+            if (false !== $res) {
                 $this->interactions_count = Database::num_rows($res);
             } else {
                 $this->interactions_count = 0;
@@ -3041,7 +3039,7 @@ class learnpathItem
 
             $this->objectives_count = 0;
             $res = Database::query($sql);
-            if ($res !== false) {
+            if (false !== $res) {
                 $this->objectives_count = Database::num_rows($res);
             }
         }
@@ -3098,7 +3096,7 @@ class learnpathItem
             $current_status = $this->get_status(false);
 
             // Fixes bug when SCORM doesn't send a mastery score even if they sent a score!
-            if ($masteryScore == -1) {
+            if (-1 == $masteryScore) {
                 $masteryScore = $this->max_score;
             }
 
@@ -3134,7 +3132,7 @@ class learnpathItem
      */
     public function set_max_score($score)
     {
-        if (is_int($score) || $score == '') {
+        if (is_int($score) || '' == $score) {
             $this->view_max_score = $score;
 
             return true;
@@ -3211,7 +3209,7 @@ class learnpathItem
                 WHERE iid=".$this->get_id();
         Database::query($sql);
         // Save it to search engine.
-        if (api_get_setting('search_enabled') == 'true') {
+        if ('true' == api_get_setting('search_enabled')) {
             $di = new ChamiloIndexer();
             $di->update_terms($this->get_search_did(), $new_terms, 'T');
         }
@@ -3245,9 +3243,9 @@ class learnpathItem
             error_log("this->current_start_time: ".$this->current_start_time);
         }
 
-        if ($scorm_time == '0' &&
-            $this->type != 'sco' &&
-            $this->current_start_time != 0
+        if ('0' == $scorm_time &&
+            'sco' != $this->type &&
+            0 != $this->current_start_time
         ) {
             $myTime = time() - $this->current_start_time;
             if ($myTime > 0) {
@@ -3435,7 +3433,7 @@ class learnpathItem
         }
 
         // Step 2.1 : if normal mode total_time = total_time + total_sec
-        if ($this->type == 'sco' && $accumulateScormTime != 0) {
+        if ('sco' == $this->type && 0 != $accumulateScormTime) {
             if ($debug) {
                 error_log("accumulateScormTime is on. total_time modified: $total_time + $total_sec");
             }
@@ -3471,7 +3469,7 @@ class learnpathItem
             'failed',
         ];
 
-        if ($this->seriousgame_mode != 1 ||
+        if (1 != $this->seriousgame_mode ||
             !in_array($row['status'], $case_completed)
         ) {
             $sql = "UPDATE $item_view_table
@@ -3653,9 +3651,9 @@ class learnpathItem
             }
         }
 
-        if ((($save === false && $this->type == 'sco') ||
-           ($this->type == 'sco' && ($credit == 'no-credit' || $mode == 'review' || $mode == 'browse'))) &&
-           ($this->seriousgame_mode != 1 && $this->type == 'sco')
+        if (((false === $save && 'sco' == $this->type) ||
+           ('sco' == $this->type && ('no-credit' == $credit || 'review' == $mode || 'browse' == $mode))) &&
+           (1 != $this->seriousgame_mode && 'sco' == $this->type)
         ) {
             if ($debug) {
                 error_log(
@@ -3671,9 +3669,9 @@ class learnpathItem
             // Check the row exists.
             $inserted = false;
             // This a special case for multiple attempts and Chamilo exercises.
-            if ($this->type == 'quiz' &&
-                $this->get_prevent_reinit() == 0 &&
-                $this->get_status() == 'completed'
+            if ('quiz' == $this->type &&
+                0 == $this->get_prevent_reinit() &&
+                'completed' == $this->get_status()
             ) {
                 // We force the item to be restarted.
                 $this->restart();
@@ -3752,7 +3750,7 @@ class learnpathItem
                     Database::query($sql);
                 }
             } else {
-                if ($this->type === 'hotpotatoes') {
+                if ('hotpotatoes' === $this->type) {
                     $params = [
                         'total_time' => $this->get_total_time(),
                         'start_time' => $this->get_current_start_time(),
@@ -3773,7 +3771,7 @@ class learnpathItem
                     Database::update($item_view_table, $params, $where);
                 } else {
                     // For all other content types...
-                    if ($this->type == 'quiz') {
+                    if ('quiz' == $this->type) {
                         if ($debug) {
                             error_log("item is quiz:");
                         }
@@ -3807,13 +3805,13 @@ class learnpathItem
                         ];
 
                         // Is not multiple attempts
-                        if ($this->seriousgame_mode == 1 && $this->type == 'sco') {
+                        if (1 == $this->seriousgame_mode && 'sco' == $this->type) {
                             $total_time = " total_time = total_time +".$this->get_total_time().", ";
                             $my_status = " status = '".$this->get_status(false)."' ,";
                             if ($debug) {
                                 error_log("seriousgame_mode time changed: $total_time");
                             }
-                        } elseif ($this->get_prevent_reinit() == 1) {
+                        } elseif (1 == $this->get_prevent_reinit()) {
                             // Process of status verified into data base.
                             $sql = 'SELECT status FROM '.$item_view_table.'
                                     WHERE
@@ -3828,7 +3826,7 @@ class learnpathItem
                             // Get type lp: 1=lp dokeos and  2=scorm.
                             // If not is completed or passed or browsed and learning path is scorm.
                             if (!in_array($this->get_status(false), $case_completed) &&
-                                $my_type_lp == 2
+                                2 == $my_type_lp
                             ) {
                                 $total_time = " total_time = total_time +".$this->get_total_time().", ";
                                 $my_status = " status = '".$this->get_status(false)."' ,";
@@ -3838,7 +3836,7 @@ class learnpathItem
                             } else {
                                 // Verified into database.
                                 if (!in_array($row_verified['status'], $case_completed) &&
-                                    $my_type_lp == 2
+                                    2 == $my_type_lp
                                 ) {
                                     $total_time = " total_time = total_time +".$this->get_total_time().", ";
                                     $my_status = " status = '".$this->get_status(false)."' ,";
@@ -3846,7 +3844,7 @@ class learnpathItem
                                         error_log("total_time time changed case 1: $total_time");
                                     }
                                 } elseif (in_array($row_verified['status'], $case_completed) &&
-                                    $my_type_lp == 2 && $this->type != 'sco'
+                                    2 == $my_type_lp && 'sco' != $this->type
                                 ) {
                                     $total_time = " total_time = total_time +".$this->get_total_time().", ";
                                     $my_status = " status = '".$this->get_status(false)."' ,";
@@ -3854,8 +3852,8 @@ class learnpathItem
                                         error_log("total_time time changed case 2: $total_time");
                                     }
                                 } else {
-                                    if (($my_type_lp == 3 && $this->type == 'au') ||
-                                        ($my_type_lp == 1 && $this->type != 'dir')) {
+                                    if ((3 == $my_type_lp && 'au' == $this->type) ||
+                                        (1 == $my_type_lp && 'dir' != $this->type)) {
                                         // Is AICC or Chamilo LP
                                         $total_time = " total_time = total_time + ".$this->get_total_time().", ";
                                         $my_status = " status = '".$this->get_status(false)."' ,";
@@ -3867,13 +3865,13 @@ class learnpathItem
                             }
                         } else {
                             // Multiple attempts are allowed.
-                            if (in_array($this->get_status(false), $case_completed) && $my_type_lp == 2) {
+                            if (in_array($this->get_status(false), $case_completed) && 2 == $my_type_lp) {
                                 // Reset zero new attempt ?
                                 $my_status = " status = '".$this->get_status(false)."' ,";
                                 if ($debug) {
                                     error_log("total_time time changed Multiple attempt case 1: $total_time");
                                 }
-                            } elseif (!in_array($this->get_status(false), $case_completed) && $my_type_lp == 2) {
+                            } elseif (!in_array($this->get_status(false), $case_completed) && 2 == $my_type_lp) {
                                 $total_time = " total_time = ".$this->get_total_time().", ";
                                 $my_status = " status = '".$this->get_status(false)."' ,";
                                 if ($debug) {
@@ -3889,7 +3887,7 @@ class learnpathItem
                             }
 
                             // This code line fixes the problem of wrong status.
-                            if ($my_type_lp == 2) {
+                            if (2 == $my_type_lp) {
                                 // Verify current status in multiples attempts.
                                 $sql = 'SELECT status FROM '.$item_view_table.'
                                         WHERE
@@ -3917,7 +3915,7 @@ class learnpathItem
                         }
                     }
 
-                    if ($this->type == 'sco') {
+                    if ('sco' == $this->type) {
                         //IF scorm scorm_update_time has already updated total_time in db
                         //" . //start_time = ".$this->get_current_start_time().", " . //scorm_init_time does it
                         ////" max_time_allowed = '".$this->get_max_time_allowed()."'," .
@@ -4223,7 +4221,7 @@ class learnpathItem
                 break;
         }
 
-        if ($type == 'simple') {
+        if ('simple' == $type) {
             if (in_array($status, ['failed', 'passed', 'browsed'])) {
                 $myLessonStatus = get_lang('Incomplete');
 
@@ -4337,7 +4335,7 @@ class learnpathItem
 
         $fakeFrom = "$forumThreadTable ft INNER JOIN $itemProperty ip ";
 
-        if ($lpSessionId == 0) {
+        if (0 == $lpSessionId) {
             $fakeFrom .= "
                 ON (
                     ft.thread_id = ip.ref AND ft.c_id = ip.c_id AND (
diff --git a/public/main/lp/learnpathList.class.php b/public/main/lp/learnpathList.class.php
index c882eb30ba..d2d94663cd 100644
--- a/public/main/lp/learnpathList.class.php
+++ b/public/main/lp/learnpathList.class.php
@@ -85,7 +85,7 @@ class LearnpathList
         }
 
         $categoryFilter = '';
-        if ($ignoreCategoryFilter == false) {
+        if (false == $ignoreCategoryFilter) {
             if (!empty($categoryId)) {
                 $categoryId = (int) $categoryId;
                 $categoryFilter = " AND lp.categoryId = $categoryId";
@@ -147,14 +147,14 @@ class LearnpathList
             $visibility = $lp->isVisible($courseEntity, $sessionEntity);
 
             // If option is not true then don't show invisible LP to user
-            if ($ignoreLpVisibility === false) {
-                if ($showBlockedPrerequisite !== true && !$isAllowToEdit) {
+            if (false === $ignoreLpVisibility) {
+                if (true !== $showBlockedPrerequisite && !$isAllowToEdit) {
                     $lpVisibility = learnpath::is_lp_visible_for_student(
                         $lp,
                         $user_id,
                         $courseInfo
                     );
-                    if ($lpVisibility === false) {
+                    if (false === $lpVisibility) {
                         continue;
                     }
                 }
diff --git a/public/main/lp/lp_add.php b/public/main/lp/lp_add.php
index 5f169f6d8b..4a391d1eae 100644
--- a/public/main/lp/lp_add.php
+++ b/public/main/lp/lp_add.php
@@ -9,8 +9,6 @@
  * @author Roan Embrechts, refactoring and code cleaning
  * @author Yannick Warnier <ywarnier@beeznest.org> - cleaning and update for new SCORM tool
  * @author Julio Montoya <gugli100@gmail.com> Adding formvalidator support
- *
- * @package chamilo.learnpath
  */
 $this_section = SECTION_COURSES;
 api_protect_course_script();
@@ -165,7 +163,7 @@ $form->addElement('html', '</div>');
 $defaults['activate_start_date_check'] = 1;
 
 $defaults['accumulate_scorm_time'] = 0;
-if (api_get_setting('scorm_cumulative_session_time') == 'true') {
+if ('true' == api_get_setting('scorm_cumulative_session_time')) {
     $defaults['accumulate_scorm_time'] = 1;
 }
 
diff --git a/public/main/lp/lp_add_audio.php b/public/main/lp/lp_add_audio.php
index 98ec4b92c7..b4f06dc01f 100644
--- a/public/main/lp/lp_add_audio.php
+++ b/public/main/lp/lp_add_audio.php
@@ -7,8 +7,6 @@ use ChamiloSession as Session;
  * This is a learning path creation and player tool in Chamilo - previously.
  *
  * @author Julio Montoya  - Improving the list of templates
- *
- * @package chamilo.learnpath
  */
 $this_section = SECTION_COURSES;
 api_protect_course_script();
@@ -62,7 +60,7 @@ switch ($type) {
         break;
 }
 
-if ($action == 'add_item' && $type == 'document') {
+if ('add_item' == $action && 'document' == $type) {
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('The rich media page/activity has been added to the course')];
 }
 
@@ -123,7 +121,7 @@ $tpl = new Template(null);
 $tpl->assign('unique_file_id', api_get_unique_id());
 $tpl->assign('course_code', api_get_course_id());
 $tpl->assign('filename', $lp_item->get_title().'_nano.wav');
-$tpl->assign('enable_record_audio', api_get_setting('enable_record_audio') === 'true');
+$tpl->assign('enable_record_audio', 'true' === api_get_setting('enable_record_audio'));
 $tpl->assign('cur_dir_path', '/audio');
 $tpl->assign('lp_item_id', $lp_item_id);
 $tpl->assign('lp_dir', api_remove_trailing_slash($lpPathInfo['dir']));
diff --git a/public/main/lp/lp_add_category.php b/public/main/lp/lp_add_category.php
index ec264e8c16..5c933e15d7 100644
--- a/public/main/lp/lp_add_category.php
+++ b/public/main/lp/lp_add_category.php
@@ -3,8 +3,6 @@
 
 /**
  * @author Julio Montoya <gugli100@gmail.com> Adding formvalidator support
- *
- * @package chamilo.learnpath
  */
 $this_section = SECTION_COURSES;
 api_protect_course_script();
diff --git a/public/main/lp/lp_add_item.php b/public/main/lp/lp_add_item.php
index ecb5d3a39b..24ce9582a5 100644
--- a/public/main/lp/lp_add_item.php
+++ b/public/main/lp/lp_add_item.php
@@ -117,7 +117,7 @@ switch ($type) {
         break;
 }
 
-if ($action === 'add_item' && $type === 'document') {
+if ('add_item' === $action && 'document' === $type) {
     $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('The rich media page/activity has been added to the course')];
 }
 
@@ -198,7 +198,7 @@ echo $learnPath->return_new_tree(null, true);
 $message = isset($_REQUEST['message']) ? $_REQUEST['message'] : null;
 
 // Show the template list.
-if (($type == 'document' || $type == 'step') && !isset($_GET['file'])) {
+if (('document' == $type || 'step' == $type) && !isset($_GET['file'])) {
     // Show the template list.
     echo '<div id="frmModel" class="scrollbar-inner lp-add-item">';
     echo '</div>';
diff --git a/public/main/lp/lp_admin_view.php b/public/main/lp/lp_admin_view.php
index 0adf9caf14..da924e79a6 100644
--- a/public/main/lp/lp_admin_view.php
+++ b/public/main/lp/lp_admin_view.php
@@ -10,8 +10,6 @@ use ChamiloSession as Session;
  * @author Denes Nagy
  * @author Roan Embrechts, refactoring and code cleaning
  * @author Yannick Warnier <ywarnier@beeznest.org> - cleaning and update for new SCORM tool
- *
- * @package chamilo.learnpath
  */
 $this_section = SECTION_COURSES;
 
@@ -75,7 +73,7 @@ if (isset($_POST['save_audio'])) {
     $tbl_lp_item = Database::get_course_table(TABLE_LP_ITEM);
     // Deleting the audio fragments.
     foreach ($_POST as $key => $value) {
-        if (substr($key, 0, 9) == 'removemp3') {
+        if ('removemp3' == substr($key, 0, 9)) {
             $lp_items_to_remove_audio[] = str_ireplace('removemp3', '', $key);
             // Removing the audio from the learning path item.
             $in = implode(',', $lp_items_to_remove_audio);
@@ -89,7 +87,7 @@ if (isset($_POST['save_audio'])) {
 
     // Uploading the audio files.
     foreach ($_FILES as $key => $value) {
-        if (substr($key, 0, 7) == 'mp3file' &&
+        if ('mp3file' == substr($key, 0, 7) &&
             !empty($_FILES[$key]['tmp_name'])
         ) {
             // The id of the learning path item.
@@ -271,7 +269,7 @@ echo '</div>';
 echo '<div class="col-md-8">';
 switch ($_GET['action']) {
     case 'edit_item':
-        if (isset($is_success) && $is_success === true) {
+        if (isset($is_success) && true === $is_success) {
             echo Display::return_message(
                 get_lang('The learning object has been edited'),
                 'confirm'
@@ -281,7 +279,7 @@ switch ($_GET['action']) {
         }
         break;
     case 'delete_item':
-        if (isset($is_success) && $is_success === true) {
+        if (isset($is_success) && true === $is_success) {
             echo Display::return_message(
                 get_lang('The learning object has been deleted'),
                 'confirm'
diff --git a/public/main/lp/lp_ajax_initialize.php b/public/main/lp/lp_ajax_initialize.php
index 83e681428e..7770da49f0 100644
--- a/public/main/lp/lp_ajax_initialize.php
+++ b/public/main/lp/lp_ajax_initialize.php
@@ -6,8 +6,6 @@
  * This script, in particular, enables the process of SCO's initialization. It
  * resets the JavaScript values for each SCO to the current LMS status.
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 
@@ -76,7 +74,7 @@ function initialize_item($lp_id, $user_id, $view_id, $next_item)
      */
     $myscore = $mylpi->get_score();
     $mymax = $mylpi->get_max();
-    if ($mymax === '') {
+    if ('' === $mymax) {
         $mymax = "''";
     }
     $mymin = $mylpi->get_min();
diff --git a/public/main/lp/lp_ajax_save_item.php b/public/main/lp/lp_ajax_save_item.php
index eac003dee5..e4513376d7 100644
--- a/public/main/lp/lp_ajax_save_item.php
+++ b/public/main/lp/lp_ajax_save_item.php
@@ -7,8 +7,6 @@ use ChamiloSession as Session;
  * This script contains the server part of the AJAX interaction process.
  * The client part is located * in lp_api.php or other api's.
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 
@@ -109,7 +107,7 @@ function save_item(
     $myLPI->set_lp_view($view_id);
 
     // Launch the prerequisites check and set error if needed
-    if ($prerequisitesCheck !== true) {
+    if (true !== $prerequisitesCheck) {
         // If prerequisites were not matched, don't update any item info
         if ($debug) {
             error_log("prereq_check: ".intval($prerequisitesCheck));
@@ -130,7 +128,7 @@ function save_item(
         ];
         Event::registerLog($logInfo);
 
-        if (isset($max) && $max != -1) {
+        if (isset($max) && -1 != $max) {
             $myLPI->max_score = $max;
             $myLPI->set_max_score($max);
             if ($debug > 1) {
@@ -138,7 +136,7 @@ function save_item(
             }
         }
 
-        if (isset($min) && $min != -1 && $min != 'undefined') {
+        if (isset($min) && -1 != $min && 'undefined' != $min) {
             $myLPI->min_score = $min;
             if ($debug > 1) {
                 error_log("Setting min_score: $min");
@@ -146,7 +144,7 @@ function save_item(
         }
 
         // set_score function used to save the status, but this is not the case anymore
-        if (isset($score) && $score != -1) {
+        if (isset($score) && -1 != $score) {
             if ($debug > 1) {
                 error_log('Calling set_score('.$score.')');
                 error_log('set_score changes the status to failed/passed if mastery score is provided');
@@ -163,7 +161,7 @@ function save_item(
 
         $statusIsSet = false;
         // Default behaviour.
-        if (isset($status) && $status != '' && $status != 'undefined') {
+        if (isset($status) && '' != $status && 'undefined' != $status) {
             if ($debug > 1) {
                 error_log('Calling set_status('.$status.')');
             }
@@ -181,8 +179,8 @@ function save_item(
 
         $my_type = $myLPI->get_type();
         // Set status to completed for hotpotatoes if score > 80%.
-        if ($my_type == 'hotpotatoes') {
-            if ((empty($status) || $status == 'undefined' || $status == 'not attempted') && $max > 0) {
+        if ('hotpotatoes' == $my_type) {
+            if ((empty($status) || 'undefined' == $status || 'not attempted' == $status) && $max > 0) {
                 if (($score / $max) > 0.8) {
                     $myStatus = 'completed';
                     if ($debug > 1) {
@@ -194,7 +192,7 @@ function save_item(
                         error_log('Done calling set_status for hotpotatoes - now '.$myLPI->get_status(false));
                     }
                 }
-            } elseif ($status == 'completed' && $max > 0 && ($score / $max) < 0.8) {
+            } elseif ('completed' == $status && $max > 0 && ($score / $max) < 0.8) {
                 $myStatus = 'failed';
                 if ($debug > 1) {
                     error_log('Calling set_status('.$myStatus.') for hotpotatoes');
@@ -205,7 +203,7 @@ function save_item(
                     error_log('Done calling set_status for hotpotatoes - now '.$myLPI->get_status(false));
                 }
             }
-        } elseif ($my_type == 'sco') {
+        } elseif ('sco' == $my_type) {
             /*
              * This is a specific implementation for SCORM 1.2, matching page 26 of SCORM 1.2's RTE
              * "Normally the SCO determines its own status and passes it to the LMS.
@@ -241,7 +239,7 @@ function save_item(
              *   the LMS will leave the cmi.core.lesson_status as "completed"
              */
             $masteryScore = $myLPI->get_mastery_score();
-            if ($masteryScore == -1 || empty($masteryScore)) {
+            if (-1 == $masteryScore || empty($masteryScore)) {
                 $masteryScore = false;
             }
             $credit = $myLPI->get_credit();
@@ -252,9 +250,9 @@ function save_item(
              *    the status to either passed or failed depending on the
              *    student's score compared to the mastery score.
              */
-            if ($credit == 'credit' &&
+            if ('credit' == $credit &&
                 $masteryScore &&
-                (isset($score) && $score != -1) &&
+                (isset($score) && -1 != $score) &&
                 !$statusIsSet && !$statusSignalReceived
             ) {
                 if ($score >= $masteryScore) {
@@ -293,9 +291,9 @@ function save_item(
              *    lesson_mode is "browse", the lesson_status may change to
              *    "browsed" even if the cmi.core.credit is set to no-credit.
              */
-            if (!$statusIsSet && $credit == 'no-credit' && !$statusSignalReceived) {
+            if (!$statusIsSet && 'no-credit' == $credit && !$statusSignalReceived) {
                 $mode = $myLPI->get_lesson_mode();
-                if ($mode == 'browse' && $status == 'browsed') {
+                if ('browse' == $mode && 'browsed' == $status) {
                     if ($debug) {
                         error_log("Set status: $status because mode browse");
                     }
@@ -335,7 +333,7 @@ function save_item(
                      *   either "passed" or "failed".  If no Mastery Score is provided,
                      *   the LMS will leave the cmi.core.lesson_status as "completed”.
                      */
-                    if ($masteryScore && (isset($score) && $score != -1)) {
+                    if ($masteryScore && (isset($score) && -1 != $score)) {
                         if ($score >= $masteryScore) {
                             $myStatus = 'passed';
                         } else {
@@ -356,7 +354,7 @@ function save_item(
         // generic behaviour
         if (!$statusIsSet && !$statusSignalReceived) {
             // Default behaviour
-            if (isset($status) && $status != '' && $status != 'undefined') {
+            if (isset($status) && '' != $status && 'undefined' != $status) {
                 if ($debug > 1) {
                     error_log('Calling set_status('.$status.')');
                 }
@@ -373,7 +371,7 @@ function save_item(
             }
         }
 
-        if (isset($time) && $time != '' && $time != 'undefined') {
+        if (isset($time) && '' != $time && 'undefined' != $time) {
             // If big integer, then it's a timestamp, otherwise it's normal scorm time.
             if ($debug > 1) {
                 error_log('Calling set_time('.$time.') ');
@@ -400,11 +398,11 @@ function save_item(
             $myLPI->current_stop_time = time();
         }
 
-        if (isset($suspend) && $suspend != '' && $suspend != 'undefined') {
+        if (isset($suspend) && '' != $suspend && 'undefined' != $suspend) {
             $myLPI->current_data = $suspend;
         }
 
-        if (isset($location) && $location != '' && $location != 'undefined') {
+        if (isset($location) && '' != $location && 'undefined' != $location) {
             $myLPI->set_lesson_location($location);
         }
 
@@ -419,7 +417,7 @@ function save_item(
             }
         }
 
-        if ($core_exit != 'undefined') {
+        if ('undefined' != $core_exit) {
             $myLPI->set_core_exit($core_exit);
         }
         $myLP->save_item($item_id, false);
@@ -430,10 +428,10 @@ function save_item(
         error_log("Status in DB: $myStatusInDB");
     }
 
-    if ($myStatusInDB != 'completed' &&
-        $myStatusInDB != 'passed' &&
-        $myStatusInDB != 'browsed' &&
-        $myStatusInDB != 'failed'
+    if ('completed' != $myStatusInDB &&
+        'passed' != $myStatusInDB &&
+        'browsed' != $myStatusInDB &&
+        'failed' != $myStatusInDB
     ) {
         $myStatusInMemory = $myLPI->get_status(false);
         if ($debug) {
@@ -452,7 +450,7 @@ function save_item(
     $myTotal = $myLP->getTotalItemsCountWithoutDirs();
     $myComplete = $myLP->get_complete_items_count();
     $myProgressMode = $myLP->get_progress_bar_mode();
-    $myProgressMode = $myProgressMode == '' ? '%' : $myProgressMode;
+    $myProgressMode = '' == $myProgressMode ? '%' : $myProgressMode;
 
     if ($debug > 1) {
         error_log("mystatus: $myStatus");
@@ -460,7 +458,7 @@ function save_item(
         error_log("progress: $myComplete / $myTotal");
     }
 
-    if ($myLPI->get_type() != 'sco') {
+    if ('sco' != $myLPI->get_type()) {
         // If this object's JS status has not been updated by the SCORM API, update now.
         $return .= "olms.lesson_status='".$myStatus."';";
     }
@@ -498,7 +496,7 @@ function save_item(
         }
     }
 
-    if ($myLP->get_type() == 2) {
+    if (2 == $myLP->get_type()) {
         $return .= 'update_stats();';
     }
 
diff --git a/public/main/lp/lp_ajax_save_objectives.php b/public/main/lp/lp_ajax_save_objectives.php
index 4a6cb70bd2..6f68a325d8 100644
--- a/public/main/lp/lp_ajax_save_objectives.php
+++ b/public/main/lp/lp_ajax_save_objectives.php
@@ -6,8 +6,6 @@
  * This is a first attempt at using xajax and AJAX in general,
  * so the code might be a bit unsettling.
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 
diff --git a/public/main/lp/lp_ajax_start_timer.php b/public/main/lp/lp_ajax_start_timer.php
index aed974b74f..30d21c5c28 100644
--- a/public/main/lp/lp_ajax_start_timer.php
+++ b/public/main/lp/lp_ajax_start_timer.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 echo time();
diff --git a/public/main/lp/lp_ajax_switch_item.php b/public/main/lp/lp_ajax_switch_item.php
index 828b5b1bca..faa0c1ddd1 100644
--- a/public/main/lp/lp_ajax_switch_item.php
+++ b/public/main/lp/lp_ajax_switch_item.php
@@ -8,8 +8,6 @@ use ChamiloSession as Session;
  * in lp_api.php or other api's.
  * This is a first attempt at using xajax and AJAX in general, so the code might be a bit unsettling.
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 
@@ -111,7 +109,7 @@ function switch_item_details($lp_id, $user_id, $view_id, $current_item, $next_it
      */
     $myscore = $mylpi->get_score();
     $mymax = $mylpi->get_max();
-    if ($mymax === '') {
+    if ('' === $mymax) {
         $mymax = "''";
     }
     $mymin = $mylpi->get_min();
@@ -182,7 +180,7 @@ function switch_item_details($lp_id, $user_id, $view_id, $current_item, $next_it
     $mytotal = $mylp->getTotalItemsCountWithoutDirs();
     $mycomplete = $mylp->get_complete_items_count();
     $myprogress_mode = $mylp->get_progress_bar_mode();
-    $myprogress_mode = ($myprogress_mode == '' ? '%' : $myprogress_mode);
+    $myprogress_mode = ('' == $myprogress_mode ? '%' : $myprogress_mode);
     $mynext = $mylp->get_next_item_id();
     $myprevious = $mylp->get_previous_item_id();
     $myitemtype = $mylpi->get_type();
@@ -226,7 +224,7 @@ function switch_item_details($lp_id, $user_id, $view_id, $current_item, $next_it
         // Time from the course
         $tc = $timeTotalCourse;
         $sessionId = api_get_session_id();
-        if (!empty($sessionId) && $sessionId != 0) {
+        if (!empty($sessionId) && 0 != $sessionId) {
             /*$sql = "SELECT hours, perc FROM plugin_licences_course_session WHERE session_id = $sessionId";
             $res = Database::query($sql);
             if (Database::num_rows($res) > 0) {
diff --git a/public/main/lp/lp_ajax_switch_item_toc.php b/public/main/lp/lp_ajax_switch_item_toc.php
index 22681163a3..f20c914e96 100644
--- a/public/main/lp/lp_ajax_switch_item_toc.php
+++ b/public/main/lp/lp_ajax_switch_item_toc.php
@@ -8,8 +8,6 @@ use ChamiloSession as Session;
  * in lp_api.php or other api's.
  * This script updated the TOC of the SCORM without updating the SCO's attributes.
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 
@@ -120,7 +118,7 @@ function switch_item_toc($lpId, $userId, $viewId, $currentItem, $nextItem)
     $totalItems = $myLP->getTotalItemsCountWithoutDirs();
     $completedItems = $myLP->get_complete_items_count();
     $progressMode = $myLP->get_progress_bar_mode();
-    $progressMode = ($progressMode == '' ? '%' : $progressMode);
+    $progressMode = ('' == $progressMode ? '%' : $progressMode);
     $nextItemId = $myLP->get_next_item_id();
     $previousItemId = $myLP->get_previous_item_id();
     $itemType = $myLPI->get_type();
diff --git a/public/main/lp/lp_build.php b/public/main/lp/lp_build.php
index f0bf12fcd4..0a6de4c074 100644
--- a/public/main/lp/lp_build.php
+++ b/public/main/lp/lp_build.php
@@ -10,8 +10,6 @@ use ChamiloSession as Session;
  * @author Denes Nagy
  * @author Roan Embrechts, refactoring and code cleaning
  * @author Yannick Warnier <ywarnier@beeznest.org> - cleaning and update for new SCORM tool
- *
- * @package chamilo.learnpath
  */
 $this_section = SECTION_COURSES;
 
@@ -33,7 +31,7 @@ if (!$is_allowed_to_edit || $isStudentView) {
 }
 /* The learnpath has been just created, go get the last id. */
 $is_new = false;
-if ($learnpath_id == 0) {
+if (0 == $learnpath_id) {
     $is_new = true;
 }
 
@@ -83,7 +81,7 @@ echo $learnPath->return_new_tree();
 echo '</div>';
 echo '<div class="col-md-8">';
 
-if (isset($is_success) && $is_success === true) {
+if (isset($is_success) && true === $is_success) {
     echo Display::return_message(get_lang('The learning object has been removed'), 'confirmation');
 } else {
     if ($is_new) {
diff --git a/public/main/lp/lp_content.php b/public/main/lp/lp_content.php
index 273ef35c11..c1ce62cfb4 100644
--- a/public/main/lp/lp_content.php
+++ b/public/main/lp/lp_content.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * Script that displays an error message when no content could be loaded.
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 require_once __DIR__.'/../inc/global.inc.php';
@@ -44,7 +42,7 @@ $list = $learnPath->get_toc();
 $dir = false;
 
 foreach ($list as $toc) {
-    if ($toc['id'] == $lpItemId && $toc['type'] == 'dir') {
+    if ($toc['id'] == $lpItemId && 'dir' == $toc['type']) {
         $dir = true;
     }
 }
@@ -56,7 +54,7 @@ if ($dir) {
         case 1:
             $learnPath->stop_previous_item();
             $prerequisiteCheck = $learnPath->prerequisites_match($lpItemId);
-            if ($prerequisiteCheck === true) {
+            if (true === $prerequisiteCheck) {
                 $src = $learnPath->get_link('http', $lpItemId);
                 $learnPath->start_current_item(); // starts time counter manually if asset
                 $src = $learnPath->fixBlockedLinks($src);
@@ -68,7 +66,7 @@ if ($dir) {
             $learnPath->stop_previous_item();
             $prerequisiteCheck = $learnPath->prerequisites_match($lpItemId);
 
-            if ($prerequisiteCheck === true) {
+            if (true === $prerequisiteCheck) {
                 $src = $learnPath->get_link('http', $lpItemId);
                 $learnPath->start_current_item(); // starts time counter manually if asset
             } else {
@@ -79,7 +77,7 @@ if ($dir) {
             // save old if asset
             $learnPath->stop_previous_item(); // save status manually if asset
             $prerequisiteCheck = $learnPath->prerequisites_match($lpItemId);
-            if ($prerequisiteCheck === true) {
+            if (true === $prerequisiteCheck) {
                 $src = $learnPath->get_link('http', $lpItemId);
                 $learnPath->start_current_item(); // starts time counter manually if asset
             } else {
diff --git a/public/main/lp/lp_controller.php b/public/main/lp/lp_controller.php
index ed34191de7..ff3a444e8f 100644
--- a/public/main/lp/lp_controller.php
+++ b/public/main/lp/lp_controller.php
@@ -26,8 +26,8 @@ $_course = api_get_course_info();
 $glossaryExtraTools = api_get_setting('show_glossary_in_extra_tools');
 $showGlossary = in_array($glossaryExtraTools, ['true', 'lp', 'exercise_and_lp']);
 if ($showGlossary) {
-    if (api_get_setting('show_glossary_in_documents') === 'ismanual' ||
-        api_get_setting('show_glossary_in_documents') === 'isautomatic'
+    if ('ismanual' === api_get_setting('show_glossary_in_documents') ||
+        'isautomatic' === api_get_setting('show_glossary_in_documents')
     ) {
         $htmlHeadXtra[] = '<script>
     <!--
@@ -302,7 +302,7 @@ $lpfound = false;
 $myrefresh = 0;
 $myrefresh_id = 0;
 $refresh = Session::read('refresh');
-if ($refresh == 1) {
+if (1 == $refresh) {
     // Check if we should do a refresh of the oLP object (for example after editing the LP).
     // If refresh is set, we regenerate the oLP object from the database (kind of flush).
     Session::erase('refresh');
@@ -327,7 +327,7 @@ if (!empty($lpObject)) {
         if ($debug) {
             error_log(' oLP is object');
         }
-        if ($myrefresh == 1 ||
+        if (1 == $myrefresh ||
             empty($oLP->cc) ||
             $oLP->cc != api_get_course_id() ||
             $oLP->lp_view_session_id != $session_id
@@ -340,7 +340,7 @@ if (!empty($lpObject)) {
                 error_log('api_get_course_id(): '.api_get_course_id());
             }
 
-            if ($myrefresh == 1) {
+            if (1 == $myrefresh) {
                 $myrefresh_id = $oLP->get_id();
             }
             $oLP = null;
@@ -400,25 +400,25 @@ if (!$lp_found || (!empty($_REQUEST['lp_id']) && $_SESSION['oLP']->get_id() != $
                 switch ($type) {
                     case 1:
                         $oLP = new learnpath(api_get_course_id(), $lpIid, api_get_user_id());
-                        if ($oLP !== false) {
+                        if (false !== $oLP) {
                             $lp_found = true;
                         }
                         break;
                     case 2:
                         $oLP = new scorm(api_get_course_id(), $lpIid, api_get_user_id());
-                        if ($oLP !== false) {
+                        if (false !== $oLP) {
                             $lp_found = true;
                         }
                         break;
                     case 3:
                         $oLP = new aicc(api_get_course_id(), $lpIid, api_get_user_id());
-                        if ($oLP !== false) {
+                        if (false !== $oLP) {
                             $lp_found = true;
                         }
                         break;
                     default:
                         $oLP = new learnpath(api_get_course_id(), $lpIid, api_get_user_id());
-                        if ($oLP !== false) {
+                        if (false !== $oLP) {
                             $lp_found = true;
                         }
                         break;
@@ -495,7 +495,7 @@ if (isset($_POST['title'])) {
     $post_title = Security::remove_XSS($_POST['title']);
     if (isset($_POST['type']) &&
         isset($_POST['title']) &&
-        $_POST['type'] == TOOL_QUIZ &&
+        TOOL_QUIZ == $_POST['type'] &&
         !empty($_POST['title'])
     ) {
         $post_title = Exercise::format_title_variable($_POST['title']);
@@ -593,8 +593,8 @@ switch ($action) {
                     $prerequisites = isset($_POST['prerequisites']) ? $_POST['prerequisites'] : '';
                     $maxTimeAllowed = isset($_POST['maxTimeAllowed']) ? $_POST['maxTimeAllowed'] : '';
 
-                    if ($_POST['type'] == TOOL_DOCUMENT) {
-                        if (isset($_POST['path']) && $_GET['edit'] != 'true') {
+                    if (TOOL_DOCUMENT == $_POST['type']) {
+                        if (isset($_POST['path']) && 'true' != $_GET['edit']) {
                             $document_id = $_POST['path'];
                         } else {
                             if ($_POST['content_lp']) {
@@ -617,8 +617,8 @@ switch ($action) {
                             $description,
                             $prerequisites
                         );
-                    } elseif ($_POST['type'] == TOOL_READOUT_TEXT) {
-                        if (isset($_POST['path']) && $_GET['edit'] != 'true') {
+                    } elseif (TOOL_READOUT_TEXT == $_POST['type']) {
+                        if (isset($_POST['path']) && 'true' != $_GET['edit']) {
                             $document_id = $_POST['path'];
                         } else {
                             $document_id = $_SESSION['oLP']->createReadOutText(
@@ -681,7 +681,7 @@ switch ($action) {
                 $lp_item_obj = new learnpathItem($_REQUEST['id']);
 
                 // Remove audio
-                if (isset($_GET['delete_file']) && $_GET['delete_file'] == 1) {
+                if (isset($_GET['delete_file']) && 1 == $_GET['delete_file']) {
                     $lp_item_obj->remove_audio();
 
                     $url = api_get_self().'?action=add_audio&lp_id='.intval($_SESSION['oLP']->lp_id).'&id='.$lp_item_obj->get_id().'&'.api_get_cidreq();
@@ -760,14 +760,14 @@ switch ($action) {
 
                 $publicated_on = null;
                 if (isset($_REQUEST['activate_start_date_check']) &&
-                    $_REQUEST['activate_start_date_check'] == 1
+                    1 == $_REQUEST['activate_start_date_check']
                 ) {
                     $publicated_on = $_REQUEST['publicated_on'];
                 }
 
                 $expired_on = null;
                 if (isset($_REQUEST['activate_end_date_check']) &&
-                    $_REQUEST['activate_end_date_check'] == 1
+                    1 == $_REQUEST['activate_end_date_check']
                 ) {
                     $expired_on = $_REQUEST['expired_on'];
                 }
@@ -826,7 +826,7 @@ switch ($action) {
         break;
     case 'auto_launch':
         // Redirect to a specific LP
-        if (api_get_course_setting('enable_lp_auto_launch') == 1) {
+        if (1 == api_get_course_setting('enable_lp_auto_launch')) {
             if (!$is_allowed_to_edit) {
                 api_not_allowed(true);
             }
@@ -895,7 +895,7 @@ switch ($action) {
                 header('Location: '.$url);
                 exit;
             }
-            if (isset($_GET['view']) && $_GET['view'] === 'build') {
+            if (isset($_GET['view']) && 'build' === $_GET['view']) {
                 require 'lp_edit_item.php';
             } else {
                 require 'lp_admin_view.php';
@@ -955,7 +955,7 @@ switch ($action) {
                 header('Location: '.$url);
                 exit;
             }
-            if (isset($_GET['view']) && $_GET['view'] == 'build') {
+            if (isset($_GET['view']) && 'build' == $_GET['view']) {
                 require 'lp_move_item.php';
             } else {
                 // Avoids weird behaviours see CT#967.
@@ -995,7 +995,7 @@ switch ($action) {
         }
 
         $hideScormCopyLink = api_get_setting('hide_scorm_copy_link');
-        if ($hideScormCopyLink === 'true') {
+        if ('true' === $hideScormCopyLink) {
             api_not_allowed(true);
         }
 
@@ -1011,7 +1011,7 @@ switch ($action) {
             api_not_allowed(true);
         }
         $hideScormExportLink = api_get_setting('hide_scorm_export_link');
-        if ($hideScormExportLink === 'true') {
+        if ('true' === $hideScormExportLink) {
             api_not_allowed(true);
         }
         if (!$lp_found) {
@@ -1023,7 +1023,7 @@ switch ($action) {
         break;
     case 'export_to_pdf':
         $hideScormPdfLink = api_get_setting('hide_scorm_pdf_link');
-        if ($hideScormPdfLink === 'true') {
+        if ('true' === $hideScormPdfLink) {
             api_not_allowed(true);
         }
 
@@ -1173,7 +1173,7 @@ switch ($action) {
             $author = $_REQUEST['lp_author'];
             // Fixing the author name (no body or html tags).
             $auth_init = stripos($author, '<p>');
-            if ($auth_init === false) {
+            if (false === $auth_init) {
                 $auth_init = stripos($author, '<body>');
                 $auth_end = $auth_init + stripos(substr($author, $auth_init + 6), '</body>') + 7;
                 $len = $auth_end - $auth_init + 6;
@@ -1196,7 +1196,7 @@ switch ($action) {
             $_SESSION['oLP']->set_theme($_REQUEST['lp_theme']);
 
             $hide_toc_frame = null;
-            if (isset($_REQUEST['hide_toc_frame']) && $_REQUEST['hide_toc_frame'] == 1) {
+            if (isset($_REQUEST['hide_toc_frame']) && 1 == $_REQUEST['hide_toc_frame']) {
                 $hide_toc_frame = $_REQUEST['hide_toc_frame'];
             }
             $_SESSION['oLP']->set_hide_toc_frame($hide_toc_frame);
@@ -1211,12 +1211,12 @@ switch ($action) {
             $_SESSION['oLP']->setAccumulateScormTime($accumulateScormTime);
 
             $publicated_on = null;
-            if (isset($_REQUEST['activate_start_date_check']) && $_REQUEST['activate_start_date_check'] == 1) {
+            if (isset($_REQUEST['activate_start_date_check']) && 1 == $_REQUEST['activate_start_date_check']) {
                 $publicated_on = $_REQUEST['publicated_on'];
             }
 
             $expired_on = null;
-            if (isset($_REQUEST['activate_end_date_check']) && $_REQUEST['activate_end_date_check'] == 1) {
+            if (isset($_REQUEST['activate_end_date_check']) && 1 == $_REQUEST['activate_end_date_check']) {
                 $expired_on = $_REQUEST['expired_on'];
             }
 
@@ -1241,7 +1241,7 @@ switch ($action) {
             $form->addSelect('skills', 'skills');
             Skill::saveSkills($form, ITEM_TYPE_LEARNPATH, $_SESSION['oLP']->get_id());
 
-            if (api_get_setting('search_enabled') === 'true') {
+            if ('true' === api_get_setting('search_enabled')) {
                 require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
                 $specific_fields = get_specific_field_list();
                 foreach ($specific_fields as $specific_field) {
@@ -1398,13 +1398,13 @@ switch ($action) {
     case 'mode':
         // Switch between fullscreen and embedded mode.
         $mode = $_REQUEST['mode'];
-        if ($mode == 'fullscreen') {
+        if ('fullscreen' == $mode) {
             $_SESSION['oLP']->mode = 'fullscreen';
-        } elseif ($mode == 'embedded') {
+        } elseif ('embedded' == $mode) {
             $_SESSION['oLP']->mode = 'embedded';
-        } elseif ($mode == 'embedframe') {
+        } elseif ('embedframe' == $mode) {
             $_SESSION['oLP']->mode = 'embedframe';
-        } elseif ($mode == 'impress') {
+        } elseif ('impress' == $mode) {
             $_SESSION['oLP']->mode = 'impress';
         }
         require 'lp_view.php';
diff --git a/public/main/lp/lp_edit.php b/public/main/lp/lp_edit.php
index ffe65cd8de..9f1f0e87ef 100644
--- a/public/main/lp/lp_edit.php
+++ b/public/main/lp/lp_edit.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * Script allowing simple edition of learnpath information (title, description, etc).
  *
- * @package chamilo.learnpath
- *
  * @author  Yannick Warnier <ywarnier@beeznest.org>
  */
 require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
@@ -93,9 +91,9 @@ $form->addElement(
     get_lang('Hide table of contents frame')
 );
 
-if (api_get_setting('allow_course_theme') === 'true') {
+if ('true' === api_get_setting('allow_course_theme')) {
     $mycourselptheme = api_get_course_setting('allow_learning_path_theme');
-    if (!empty($mycourselptheme) && $mycourselptheme != -1 && $mycourselptheme == 1) {
+    if (!empty($mycourselptheme) && -1 != $mycourselptheme && 1 == $mycourselptheme) {
         //LP theme picker
         $theme_select = $form->addElement('SelectTheme', 'lp_theme', get_lang('Graphical theme'));
         $form->applyFilter('lp_theme', 'trim');
@@ -121,12 +119,12 @@ if (strlen($learnPath->get_preview_image()) > 0) {
     $form->addElement('label', get_lang('Image preview'), $show_preview_image);
     $form->addElement('checkbox', 'remove_picture', null, get_lang('Remove picture'));
 }
-$label = $learnPath->get_preview_image() != '' ? get_lang('Update Image') : get_lang('Add image');
+$label = '' != $learnPath->get_preview_image() ? get_lang('Update Image') : get_lang('Add image');
 $form->addElement('file', 'lp_preview_image', [$label, get_lang('Trainer picture will resize if needed')]);
 $form->addRule('lp_preview_image', get_lang('Only PNG, JPG or GIF images allowed'), 'filetype', ['jpg', 'jpeg', 'png', 'gif']);
 
 // Search terms (only if search is activated).
-if (api_get_setting('search_enabled') === 'true') {
+if ('true' === api_get_setting('search_enabled')) {
     $specific_fields = get_specific_field_list();
     foreach ($specific_fields as $specific_field) {
         $form->addElement('text', $specific_field['code'], $specific_field['name']);
@@ -185,7 +183,7 @@ $form->addElement(
 );
 
 $display_date = 'none';
-if (!empty($publicated_on) && $publicated_on !== '0000-00-00 00:00:00') {
+if (!empty($publicated_on) && '0000-00-00 00:00:00' !== $publicated_on) {
     $display_date = 'block';
     $defaults['activate_start_date_check'] = 1;
 }
@@ -266,7 +264,7 @@ $(function() {
 
 $htmlHeadXtra[] = '<script>'.$learnPath->get_js_dropdown_array().'</script>';
 
-$defaults['publicated_on'] = !empty($publicated_on) && $publicated_on !== '0000-00-00 00:00:00'
+$defaults['publicated_on'] = !empty($publicated_on) && '0000-00-00 00:00:00' !== $publicated_on
     ? api_get_local_time($publicated_on)
     : null;
 $defaults['expired_on'] = (!empty($expired_on))
diff --git a/public/main/lp/lp_edit_item.php b/public/main/lp/lp_edit_item.php
index ea532ae87e..82b0a951b8 100644
--- a/public/main/lp/lp_edit_item.php
+++ b/public/main/lp/lp_edit_item.php
@@ -11,8 +11,6 @@ use ChamiloSession as Session;
  * @author Roan Embrechts, refactoring and code cleaning
  * @author Yannick Warnier <ywarnier@beeznest.org> - cleaning and update for new SCORM tool
  * @author Julio Montoya  - Improving the list of templates
- *
- * @package chamilo.learnpath
  */
 $this_section = SECTION_COURSES;
 api_protect_course_script();
@@ -139,7 +137,7 @@ if (empty($documentInfo)) {
 
 $path_parts = pathinfo($path_file);
 
-if (!empty($path_file) && isset($path_parts['extension']) && $path_parts['extension'] == 'html') {
+if (!empty($path_file) && isset($path_parts['extension']) && 'html' == $path_parts['extension']) {
     echo $learnPath->return_new_tree();
     // Show the template list
     echo '<div id="frmModel" class="scrollbar-inner lp-add-item"></div>';
@@ -149,7 +147,7 @@ if (!empty($path_file) && isset($path_parts['extension']) && $path_parts['extens
 echo '</div>';
 echo '<div id="doc_form" class="col-md-8">';
 
-if (isset($is_success) && $is_success === true) {
+if (isset($is_success) && true === $is_success) {
     $msg = '<div class="lp_message" style="margin-bottom:10px;">';
     $msg .= 'The item has been edited.';
     $msg .= '</div>';
diff --git a/public/main/lp/lp_edit_item_prereq.php b/public/main/lp/lp_edit_item_prereq.php
index c4e2fea76f..e3e724c8a4 100644
--- a/public/main/lp/lp_edit_item_prereq.php
+++ b/public/main/lp/lp_edit_item_prereq.php
@@ -10,8 +10,6 @@ use ChamiloSession as Session;
  * @author Denes Nagy
  * @author Roan Embrechts, refactoring and code cleaning
  * @author Yannick Warnier <ywarnier@beeznest.org> - cleaning and update for new SCORM tool
- *
- * @package chamilo.learnpath
  */
 $this_section = SECTION_COURSES;
 
@@ -88,7 +86,7 @@ echo '</div>';
 echo '<div class="col-md-9">';
 echo '<div class="prerequisites">';
 $lpItem = new learnpathItem($_GET['id']);
-if (isset($is_success) && $is_success == true) {
+if (isset($is_success) && true == $is_success) {
     echo $lp->display_manipulate($_GET['id'], $lpItem->get_type());
     echo Display::return_message(get_lang('Prerequisites to the current learning object have been added.'));
 } else {
diff --git a/public/main/lp/lp_final_item.php b/public/main/lp/lp_final_item.php
index 7606e75121..fbdead6d57 100644
--- a/public/main/lp/lp_final_item.php
+++ b/public/main/lp/lp_final_item.php
@@ -5,8 +5,6 @@
  * Print a learning path finish page with details.
  *
  * @author Jose Loguercio <jose.loguercio@beeznest.com>
- *
- * @package chamilo.learnpath
  */
 $_in_course = true;
 
@@ -76,8 +74,8 @@ $currentItem = $lp->items[$currentItemId];
 $currentItemStatus = $currentItem->get_status();
 $accessGranted = false;
 
-if (($count - $completed == 0) ||
-    ($count - $completed == 1 && ($currentItemStatus == 'incomplete') || ($currentItemStatus == 'not attempted'))
+if ((0 == $count - $completed) ||
+    (1 == $count - $completed && ('incomplete' == $currentItemStatus) || ('not attempted' == $currentItemStatus))
 ) {
     if ($lp->prerequisites_match($currentItemId)) {
         $accessGranted = true;
@@ -92,7 +90,7 @@ unset($currentItem);
 
 // If for some reason we consider the requirements haven't been completed yet,
 // show a prerequisites warning
-if ($accessGranted == false) {
+if (false == $accessGranted) {
     echo Display::return_message(
         get_lang('This learning object cannot display because the course prerequisites are not completed. This happens when a course imposes that you follow it step by step or get a minimum score in tests before you reach the next steps.'),
         'warning'
@@ -274,8 +272,8 @@ function generateLPFinalItemTemplateBadgeLinks($userId, $courseId, $sessionId =
             ";
         }
 
-	if (!empty($skillList)) {
-		$badgeLink .= "
+        if (!empty($skillList)) {
+            $badgeLink .= "
 		    <div class='panel panel-default'>
 		        <div class='panel-body'>
 		            <h3 class='text-center'>".get_lang('Additionally, you have achieved the following skills')."</h3>
@@ -283,7 +281,7 @@ function generateLPFinalItemTemplateBadgeLinks($userId, $courseId, $sessionId =
 		        </div>
 		    </div>
 		";
-	}
+        }
     }
 
     return $badgeLink;
diff --git a/public/main/lp/lp_impress.php b/public/main/lp/lp_impress.php
index 56f051376c..6a80fc1009 100644
--- a/public/main/lp/lp_impress.php
+++ b/public/main/lp/lp_impress.php
@@ -3,9 +3,6 @@
 
 use ChamiloSession as Session;
 
-/**
- * @package chamilo.learnpath
- */
 require_once __DIR__.'/../inc/global.inc.php';
 
 $this_section = SECTION_COURSES;
@@ -34,7 +31,7 @@ $visibility = api_get_item_visibility(
     null,
     api_get_group_id()
 );
-if (!api_is_allowed_to_edit(null, true) && intval($visibility) == 0) {
+if (!api_is_allowed_to_edit(null, true) && 0 == intval($visibility)) {
     api_not_allowed();
 }
 /** @var learnpath $lp */
@@ -73,7 +70,7 @@ foreach ($list as $toc) {
     $html .= '<div id="step-'.$step.'" class="step slide" data-x="'.$x.'" data-y="-1500"  >';
     $html .= '<div class="impress-content">';
     $src = $lp->get_link('http', $toc['id']);
-    if ($toc['type'] !== 'dir') {
+    if ('dir' !== $toc['type']) {
         //just showing the src in a iframe ...
         $html .= '<h2>'.$toc['title'].'</h2>';
         $html .= '<iframe border="0" frameborder="0" style="width:100%;height:600px" src="'.$src.'"></iframe>';
diff --git a/public/main/lp/lp_list.php b/public/main/lp/lp_list.php
index bcb5330584..1a1bfdeedf 100644
--- a/public/main/lp/lp_list.php
+++ b/public/main/lp/lp_list.php
@@ -13,7 +13,7 @@ use ChamiloSession as Session;
  * @author  Yannick Warnier <ywarnier@beeznest.org>
  */
 //@todo who turns on $lp_controller_touched?
-if (empty($lp_controller_touched) || $lp_controller_touched != 1) {
+if (empty($lp_controller_touched) || 1 != $lp_controller_touched) {
     header('Location: lp_controller.php?action=list&'.api_get_cidreq());
     exit;
 }
@@ -39,7 +39,7 @@ $nameTools = get_lang('Learning paths');
 Event::event_access_tool(TOOL_LEARNPATH);
 
 /* Require the search widget and prepare the header with its stuff. */
-if (api_get_setting('search_enabled') === 'true') {
+if ('true' === api_get_setting('search_enabled')) {
     require api_get_path(LIBRARY_PATH).'search/search_widget.php';
     search_widget_prepare($htmlHeadXtra);
 }
@@ -88,7 +88,7 @@ if ($is_allowed_to_edit) {
         '../upload/index.php?'.api_get_cidreq().'&curdirpath=/&tool='.TOOL_LEARNPATH
     );
 
-    if (api_get_setting('service_ppt2lp', 'active') === 'true') {
+    if ('true' === api_get_setting('service_ppt2lp', 'active')) {
         $actionLeft .= Display::url(
             Display::return_icon(
                 'import_powerpoint.png',
@@ -131,7 +131,7 @@ if (!empty($categoriesTempList)) {
 $userId = api_get_user_id();
 $userInfo = api_get_user_info();
 $lpIsShown = false;
-$filteredCategoryId = ($action === 'view_category' && !empty($_GET['id'])) ? intval($_GET['id']) : 0;
+$filteredCategoryId = ('view_category' === $action && !empty($_GET['id'])) ? intval($_GET['id']) : 0;
 
 if ($filteredCategoryId) {
     /** @var CLpCategory $category */
@@ -191,10 +191,10 @@ $data = [];
 foreach ($categories as $category) {
     $categoryId = $category->getId();
     $visibility = true;
-    if ($categoryId !== 0) {
+    if (0 !== $categoryId) {
         $visibility = $category->isVisible($courseEntity, $sessionEntity);
     }
-    if ($categoryId !== 0 && $subscriptionSettings['allow_add_users_to_lp_category'] == true) {
+    if (0 !== $categoryId && true == $subscriptionSettings['allow_add_users_to_lp_category']) {
         // "Without category" has id = 0
         /*$categoryVisibility = api_get_item_visibility(
             $courseInfo,
@@ -253,7 +253,7 @@ foreach ($categories as $category) {
         foreach ($flat_list as $id => $details) {
             $id = $details['lp_old_id'];
 
-            if (!$is_allowed_to_edit && $details['lp_visibility'] == 0) {
+            if (!$is_allowed_to_edit && 0 == $details['lp_visibility']) {
                 // This is a student and this path is invisible, skip.
                 continue;
             }
@@ -268,7 +268,7 @@ foreach ($categories as $category) {
                     $courseInfo,
                     $sessionId
                 );
-                if ($lpVisibility === false && $isBlocked && $showBlockedPrerequisite === false) {
+                if (false === $lpVisibility && $isBlocked && false === $showBlockedPrerequisite) {
                     continue;
                 }
             }
@@ -289,7 +289,7 @@ foreach ($categories as $category) {
                 }
 
                 // Checking if expired_on is ON
-                if ($details['expired_on'] != '') {
+                if ('' != $details['expired_on']) {
                     $time_limits = true;
                 }
 
@@ -312,7 +312,7 @@ foreach ($categories as $category) {
 
             $counter++;
             $oddclass = 'row_even';
-            if (($counter % 2) == 0) {
+            if (0 == ($counter % 2)) {
                 $oddclass = 'row_odd';
             }
 
@@ -334,7 +334,7 @@ foreach ($categories as $category) {
 
             $my_title = $name;
             $icon_learnpath = $defaultLpIcon;
-            if ($details['lp_visibility'] == 0) {
+            if (0 == $details['lp_visibility']) {
                 $my_title = Display::tag(
                     'font',
                     $name,
@@ -351,8 +351,8 @@ foreach ($categories as $category) {
             }
 
             // Students can see the lp but is inactive
-            if (!$is_allowed_to_edit && $lpVisibility == false &&
-                $showBlockedPrerequisite == true
+            if (!$is_allowed_to_edit && false == $lpVisibility &&
+                true == $showBlockedPrerequisite
             ) {
                 $my_title = Display::tag(
                     'font',
@@ -457,7 +457,7 @@ foreach ($categories as $category) {
             $actionUpdateScormFile = '';
             $actionExportToCourseBuild = '';
             // Only for "Chamilo" packages
-            $allowExportCourseFormat = $allowLpChamiloExport && $details['lp_maker'] === 'Chamilo';
+            $allowExportCourseFormat = $allowLpChamiloExport && 'Chamilo' === $details['lp_maker'];
 
             if ($is_allowed_to_edit) {
                 // EDIT LP
@@ -472,7 +472,7 @@ foreach ($categories as $category) {
 
                 // BUILD
                 if ($sessionId == $details['lp_session']) {
-                    if ($details['lp_type'] == 1 || $details['lp_type'] == 2) {
+                    if (1 == $details['lp_type'] || 2 == $details['lp_type']) {
                         $dsp_build = Display::url(
                             Display::return_icon(
                                 'edit.png',
@@ -507,9 +507,9 @@ foreach ($categories as $category) {
                     See http://support.chamilo.org/projects/chamilo-18/wiki/Tools_and_sessions).
                 */
                 if (!isset($details['subscribe_users']) ||
-                    $details['subscribe_users'] != 1
+                    1 != $details['subscribe_users']
                 ) {
-                    if ($details['lp_visibility'] == 0) {
+                    if (0 == $details['lp_visibility']) {
                         $dsp_visible = Display::url(
                             Display::return_icon(
                                 'invisible.png',
@@ -540,7 +540,7 @@ foreach ($categories as $category) {
 
                 /* PUBLISH COMMAND */
                 if ($sessionId == $details['lp_session']) {
-                    if ($details['lp_published'] == 'i') {
+                    if ('i' == $details['lp_published']) {
                         $dsp_publish = Display::url(
                             Display::return_icon(
                                 'lp_publish_na.png',
@@ -571,7 +571,7 @@ foreach ($categories as $category) {
                  * It is thus a mix betwenn multiple attempt and mono attempt
                  */
                 if ($sessionId == $details['lp_session']) {
-                    if ($details['seriousgame_mode'] == 1 && $details['lp_prevent_reinit'] == 1) {
+                    if (1 == $details['seriousgame_mode'] && 1 == $details['lp_prevent_reinit']) {
                         // seriousgame mode | next = single
                         $dsp_reinit = Display::url(
                             Display::return_icon(
@@ -581,8 +581,8 @@ foreach ($categories as $category) {
                             'lp_controller.php?'.$cidReq."&action=switch_attempt_mode&lp_id=$id"
                         );
                     }
-                    if ($details['seriousgame_mode'] == 0 &&
-                        $details['lp_prevent_reinit'] == 1
+                    if (0 == $details['seriousgame_mode'] &&
+                        1 == $details['lp_prevent_reinit']
                     ) {
                         // single mode | next = multiple
                         $dsp_reinit = Display::url(
@@ -593,8 +593,8 @@ foreach ($categories as $category) {
                             'lp_controller.php?'.$cidReq."&action=switch_attempt_mode&lp_id=$id"
                         );
                     }
-                    if ($details['seriousgame_mode'] == 0 &&
-                        $details['lp_prevent_reinit'] == 0
+                    if (0 == $details['seriousgame_mode'] &&
+                        0 == $details['lp_prevent_reinit']
                     ) {
                         // multiple mode | next = seriousgame
                         $dsp_reinit = Display::url(
@@ -653,7 +653,7 @@ foreach ($categories as $category) {
                             break;
                     }
                 } else {
-                    if ($details['lp_view_mode'] === 'fullscreen') {
+                    if ('fullscreen' === $details['lp_view_mode']) {
                         $dsp_default_view = Display::return_icon(
                             'view_fullscreen_na.png',
                             get_lang('Current view mode: embedded')
@@ -667,8 +667,8 @@ foreach ($categories as $category) {
                 }
 
                 /*  DEBUG  */
-                if ($test_mode === 'test' || api_is_platform_admin()) {
-                    if ($details['lp_scorm_debug'] == 1) {
+                if ('test' === $test_mode || api_is_platform_admin()) {
+                    if (1 == $details['lp_scorm_debug']) {
                         $dsp_debug = Display::url(
                             Display::return_icon(
                                 'bug.png',
@@ -688,12 +688,12 @@ foreach ($categories as $category) {
                 }
 
                 /* Export */
-                if ($details['lp_type'] == 1) {
+                if (1 == $details['lp_type']) {
                     $dsp_disk = Display::url(
                         Display::return_icon('cd.png', get_lang('Export as SCORM')),
                         api_get_self()."?$cidReq&action=export&lp_id=$id"
                     );
-                } elseif ($details['lp_type'] == 2) {
+                } elseif (2 == $details['lp_type']) {
                     $dsp_disk = Display::url(
                         Display::return_icon('cd.png', get_lang('Export as SCORM')),
                         api_get_self()."?$cidReq&action=export&lp_id=$id&export_name="
@@ -714,7 +714,7 @@ foreach ($categories as $category) {
 
                 // Subscribe users
                 $subscribeUsers = '';
-                if ($details['subscribe_users'] == 1 &&
+                if (1 == $details['subscribe_users'] &&
                     $subscriptionSettings['allow_add_users_to_lp']
                 ) {
                     $subscribeUsers = Display::url(
@@ -727,9 +727,9 @@ foreach ($categories as $category) {
                 }
 
                 /* Auto launch LP code */
-                if ($enableAutoLaunch == 1) {
-                    if ($details['autolaunch'] == 1 &&
-                        $autolaunch_exists == false
+                if (1 == $enableAutoLaunch) {
+                    if (1 == $details['autolaunch'] &&
+                        false == $autolaunch_exists
                     ) {
                         $autolaunch_exists = true;
                         $lp_auto_launch_icon = Display::url(
@@ -780,18 +780,18 @@ foreach ($categories as $category) {
 
                 /* COLUMN ORDER	 */
                 // Only active while session mode is not active
-                if ($sessionId == 0) {
-                    if ($details['lp_display_order'] == 1 && $max != 1) {
+                if (0 == $sessionId) {
+                    if (1 == $details['lp_display_order'] && 1 != $max) {
                         $dsp_order .= Display::url(
                             Display::return_icon('down.png', get_lang('Move down')),
                             "lp_controller.php?$cidReq&action=move_lp_down&lp_id=$id&category_id=$categoryId"
                         );
-                    } elseif ($current == $max - 1 && $max != 1) {
+                    } elseif ($current == $max - 1 && 1 != $max) {
                         $dsp_order .= Display::url(
                             Display::return_icon('up.png', get_lang('Move up')),
                             "lp_controller.php?$cidReq&action=move_lp_up&lp_id=$id&category_id=$categoryId"
                         );
-                    } elseif ($max == 1) {
+                    } elseif (1 == $max) {
                         $dsp_order = '';
                     } else {
                         $dsp_order .= Display::url(
@@ -805,7 +805,7 @@ foreach ($categories as $category) {
                     }
                 }
 
-                if ($details['lp_type'] == 2) {
+                if (2 == $details['lp_type']) {
                     $url = api_get_path(WEB_CODE_PATH).'lp/lp_update_scorm.php?'.$cidReq."&lp_id=$id";
                     $actionUpdateScormFile = Display::url(
                         Display::return_icon('upload_file.png', get_lang('Update')),
@@ -823,8 +823,8 @@ foreach ($categories as $category) {
                     );
                 }
 
-                if ($gameMode == 1) {
-                    if ($details['seriousgame_mode'] == 0) {
+                if (1 == $gameMode) {
+                    if (0 == $details['seriousgame_mode']) {
                         $actionSeriousGame = Display::toolbarButton(
                             null,
                             api_get_self().'?'.$cidReq
@@ -858,15 +858,15 @@ foreach ($categories as $category) {
                 );
             }
 
-            if ($hideScormExportLink === 'true') {
+            if ('true' === $hideScormExportLink) {
                 $dsp_disk = null;
             }
 
-            if ($hideScormCopyLink === 'true') {
+            if ('true' === $hideScormCopyLink) {
                 $copy = null;
             }
 
-            if ($hideScormPdfLink === 'true') {
+            if ('true' === $hideScormPdfLink) {
                 $export_icon = null;
             }
 
diff --git a/public/main/lp/lp_list_search.php b/public/main/lp/lp_list_search.php
index f6a57e73f6..109bf5f745 100644
--- a/public/main/lp/lp_list_search.php
+++ b/public/main/lp/lp_list_search.php
@@ -5,8 +5,6 @@
 /**
  * Script to draw the results from a query.
  *
- * @package chamilo.learnpath
- *
  * @author Diego Escalante Urrelo <diegoe@gmail.com>
  * @author Marco Antonio Villegas Vega <marvil07@gmail.com>
  * @author Julio Montoya <gugli100@gmail.com> bug fixing
@@ -28,7 +26,7 @@ $interbreadcrumb[] = ['url' => './index.php', 'name' => get_lang(ucfirst(TOOL_SE
 search_widget_prepare($htmlHeadXtra);
 Display::display_header(null, 'Path');
 
-if (api_get_setting('search_enabled') !== 'true') {
+if ('true' !== api_get_setting('search_enabled')) {
     echo Display::return_message(get_lang('The full-text search feature is not enabled in Chamilo. Please contact the Chamilo administrator.'), 'error');
 } else {
     if (!empty($_GET['action'])) {
@@ -92,7 +90,7 @@ foreach ($specific_fields as $specific_field) {
 // Get right group of terms to show on multiple select.
 $fixed_queries = [];
 $course_filter = null;
-if (($cid = api_get_course_id()) != -1) {
+if (-1 != ($cid = api_get_course_id())) {
     // Results only from actual course.
     $course_filter = chamilo_get_boolean_query(XAPIAN_PREFIX_COURSEID.$cid);
 }
@@ -100,7 +98,7 @@ if (($cid = api_get_course_id()) != -1) {
 if (count($term_array)) {
     $fixed_queries = chamilo_join_queries($term_array, null, $op);
 
-    if ($course_filter != null) {
+    if (null != $course_filter) {
         $fixed_queries = chamilo_join_queries(
             $fixed_queries,
             $course_filter,
@@ -143,7 +141,7 @@ if ($count > 0) {
             $a_suffix = '';
         }
 
-        if ($mode == 'gallery') {
+        if ('gallery' == $mode) {
             $title = $a_prefix.str_replace('_', ' ', $result['title']).$a_suffix;
             $blocks[] = [1 => $a_prefix.'<img src="'.$result['thumbnail'].'" />'.$a_suffix.'<br />'.$title.'<br />'.$result['author'],
             ];
@@ -180,14 +178,14 @@ if (count($blocks) > 0) {
     $additional_parameters['operator'] = $op;
     $s->additional_parameters = $additional_parameters;
 
-    if ($mode == 'default') {
+    if ('default' == $mode) {
         $s->set_header(0, get_lang(ucfirst(TOOL_SEARCH)), false);
     }
 
     $search_link = '<a href="%ssearch/index.php?mode=%s&action=search&query=%s%s">';
 
-    $iconGallery = (($mode == 'gallery') ? 'ButtonGallOn' : 'ButtonGallOff').'.png';
-    $iconDefault = (($mode == 'default') ? 'ButtonListOn' : 'ButtonListOff').'.png';
+    $iconGallery = (('gallery' == $mode) ? 'ButtonGallOn' : 'ButtonGallOff').'.png';
+    $iconDefault = (('default' == $mode) ? 'ButtonListOn' : 'ButtonListOff').'.png';
 
     $mode_selector = '<div id="mode-selector">';
     $mode_selector .= sprintf($search_link, api_get_path(WEB_CODE_PATH), 'gallery', $_REQUEST['query'], $get_params);
diff --git a/public/main/lp/lp_move_item.php b/public/main/lp/lp_move_item.php
index 9c786600dd..aab2863cd8 100644
--- a/public/main/lp/lp_move_item.php
+++ b/public/main/lp/lp_move_item.php
@@ -10,8 +10,6 @@ use ChamiloSession as Session;
  * @author Denes Nagy
  * @author Roan Embrechts, refactoring and code cleaning
  * @author Yannick Warnier <ywarnier@beeznest.org> - cleaning and update for new SCORM tool
- *
- * @package chamilo.learnpath
  */
 $this_section = SECTION_COURSES;
 api_protect_course_script();
@@ -109,7 +107,7 @@ echo '</div>';
 
 echo '<div class="col-md-9">';
 
-if (isset($is_success) && $is_success === true) {
+if (isset($is_success) && true === $is_success) {
     $msg = '<div class="lp_message" style="margin-bottom:10px;">';
     $msg .= 'The item has been moved.';
     $msg .= '</div>';
diff --git a/public/main/lp/lp_nav.php b/public/main/lp/lp_nav.php
index 9dc194deae..8cbae4f082 100644
--- a/public/main/lp/lp_nav.php
+++ b/public/main/lp/lp_nav.php
@@ -5,8 +5,6 @@
  * Script opened in an iframe and containing the
  * learning path's navigation and progress bar.
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 
@@ -38,11 +36,11 @@ if ($myLP) {
 
     // Setting up the CSS theme if exists
     $myCourseLpTheme = null;
-    if (api_get_setting('allow_course_theme') === 'true') {
+    if ('true' === api_get_setting('allow_course_theme')) {
         $myCourseLpTheme = api_get_course_setting('allow_learning_path_theme');
     }
 
-    if (!empty($lp_theme_css) && !empty($myCourseLpTheme) && $myCourseLpTheme != -1 && $myCourseLpTheme == 1) {
+    if (!empty($lp_theme_css) && !empty($myCourseLpTheme) && -1 != $myCourseLpTheme && 1 == $myCourseLpTheme) {
         global $lp_theme_css;
     } else {
         $lp_theme_css = $my_style;
diff --git a/public/main/lp/lp_report.php b/public/main/lp/lp_report.php
index db74516dc6..a4908a6445 100644
--- a/public/main/lp/lp_report.php
+++ b/public/main/lp/lp_report.php
@@ -100,7 +100,7 @@ if (!empty($users)) {
             'id' => $user['user_id'],
             'first_name' => $userInfo['firstname'],
             'last_name' => $userInfo['lastname'],
-            'email' => $showEmail === 'true' ? $userInfo['email'] : '',
+            'email' => 'true' === $showEmail ? $userInfo['email'] : '',
             'lp_time' => api_time_to_hms($lpTime),
             'lp_score' => is_numeric($lpScore) ? "$lpScore%" : $lpScore,
             'lp_progress' => "$lpProgress%",
@@ -143,7 +143,7 @@ $template->assign('user_list', $userList);
 $template->assign('session_id', api_get_session_id());
 $template->assign('course_code', api_get_course_id());
 $template->assign('lp_id', $lpId);
-$template->assign('show_email', $showEmail === 'true');
+$template->assign('show_email', 'true' === $showEmail);
 $template->assign('export', (int) $export);
 $template->assign('header', $lpInfo['name']);
 $template->assign(
diff --git a/public/main/lp/lp_save.php b/public/main/lp/lp_save.php
index 8578ef4896..61e6c3a4e5 100644
--- a/public/main/lp/lp_save.php
+++ b/public/main/lp/lp_save.php
@@ -6,8 +6,6 @@ use ChamiloSession as Session;
 /**
  * Script that handles the saving of item status.
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 
@@ -26,7 +24,7 @@ use ChamiloSession as Session;
 <?php
 /** @var learnpath $lp */
 $lp = Session::read('oLP');
-if ($lp->mode != 'fullscreen') {
+if ('fullscreen' != $lp->mode) {
 }
 ?>
 </script>
diff --git a/public/main/lp/lp_stats.php b/public/main/lp/lp_stats.php
index 3acb3b962c..1a41fb8757 100644
--- a/public/main/lp/lp_stats.php
+++ b/public/main/lp/lp_stats.php
@@ -5,8 +5,6 @@
  * This script displays statistics on the current learning path (scorm)
  * This script must be included by lp_controller.php to get basic initialisation.
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 require_once __DIR__.'/../inc/global.inc.php';
@@ -25,12 +23,12 @@ $extendId = isset($_GET['extend_id']) ? $_GET['extend_id'] : null;
 $extendAttemptId = isset($_GET['extend_attempt_id']) ? $_GET['extend_attempt_id'] : null;
 $extendedAttempt = isset($_GET['extend_attempt']) ? $_GET['extend_attempt'] : null;
 $extendedAll = isset($_GET['extend_all']) ? $_GET['extend_all'] : null;
-$export = isset($_GET['export']) && $_GET['export'] === 'csv';
+$export = isset($_GET['export']) && 'csv' === $_GET['export'];
 $allowExtend = isset($_GET['allow_extend']) ? $_GET['allow_extend'] : 1;
 
 $lpReportType = api_get_setting('lp_show_reduced_report');
 $type = 'classic';
-if ($lpReportType === 'true') {
+if ('true' === $lpReportType) {
     $type = 'simple';
 }
 $courseInfo = api_get_course_info($courseCode);
@@ -51,7 +49,7 @@ $output = Tracking::getLpStats(
 );
 
 // Origin = tracking means that teachers see that info in the Reporting tool
-if ($origin !== 'tracking') {
+if ('tracking' !== $origin) {
     Display::display_reduced_header();
     $output .= '</body></html>';
 }
diff --git a/public/main/lp/lp_subscribe_users.php b/public/main/lp/lp_subscribe_users.php
index 3d6f3daaeb..75edf7023e 100644
--- a/public/main/lp/lp_subscribe_users.php
+++ b/public/main/lp/lp_subscribe_users.php
@@ -24,7 +24,7 @@ if (empty($lpId)) {
 }
 
 $subscriptionSettings = learnpath::getSubscriptionSettings();
-if ($subscriptionSettings['allow_add_users_to_lp'] == false) {
+if (false == $subscriptionSettings['allow_add_users_to_lp']) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/lp/lp_update_scorm.php b/public/main/lp/lp_update_scorm.php
index 06db5ad702..cb094a47ad 100644
--- a/public/main/lp/lp_update_scorm.php
+++ b/public/main/lp/lp_update_scorm.php
@@ -5,8 +5,6 @@
  * This is a learning path creation and player tool in Chamilo - previously.
  *
  * @author Julio Montoya  - Improving the list of templates
- *
- * @package chamilo.learnpath
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/lp/lp_upload.php b/public/main/lp/lp_upload.php
index 66ab2dc222..1d25be696c 100644
--- a/public/main/lp/lp_upload.php
+++ b/public/main/lp/lp_upload.php
@@ -7,8 +7,6 @@ use Chamilo\CourseBundle\Component\CourseCopy\CourseRestorer;
 /**
  * Script managing the learnpath upload. To best treat the uploaded file, make sure we can identify it.
  *
- * @package chamilo.learnpath
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 require_once __DIR__.'/../inc/global.inc.php';
@@ -42,7 +40,7 @@ if (isset($_POST) && $is_error) {
 
     return false;
     unset($_FILES['user_file']);
-} elseif ($_SERVER['REQUEST_METHOD'] == 'POST' && count($_FILES) > 0 && !empty($_FILES['user_file']['name'])) {
+} elseif ('POST' == $_SERVER['REQUEST_METHOD'] && count($_FILES) > 0 && !empty($_FILES['user_file']['name'])) {
     // A file upload has been detected, now deal with the file...
     // Directory creation.
     $stopping_error = false;
@@ -124,7 +122,7 @@ if (isset($_POST) && $is_error) {
             break;
         case 'woogie':
             require_once 'openoffice_text.class.php';
-            $split_steps = (empty($_POST['split_steps']) || $_POST['split_steps'] == 'per_page') ? 'per_page' : 'per_chapter';
+            $split_steps = (empty($_POST['split_steps']) || 'per_page' == $_POST['split_steps']) ? 'per_page' : 'per_chapter';
             $o_doc = new OpenofficeText($split_steps);
             $first_item_id = $o_doc->convert_document($_FILES['user_file']);
             Display::addFlash(Display::return_message(get_lang('File upload succeeded!')));
@@ -136,7 +134,7 @@ if (isset($_POST) && $is_error) {
             return false;
             break;
     }
-} elseif ($_SERVER['REQUEST_METHOD'] == 'POST') {
+} elseif ('POST' == $_SERVER['REQUEST_METHOD']) {
     // end if is_uploaded_file
     // If file name given to get in /upload/, try importing this way.
     // A file upload has been detected, now deal with the file...
diff --git a/public/main/lp/lp_view.php b/public/main/lp/lp_view.php
index b798a9a84b..cad63fab80 100644
--- a/public/main/lp/lp_view.php
+++ b/public/main/lp/lp_view.php
@@ -21,7 +21,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 
 api_protect_course_script();
 
-if (isset($_REQUEST['origin']) && $_REQUEST['origin'] === 'learnpath') {
+if (isset($_REQUEST['origin']) && 'learnpath' === $_REQUEST['origin']) {
     $_REQUEST['origin'] = '';
 }
 
@@ -56,7 +56,7 @@ if (!api_is_platform_admin()) {
 // Checking visibility (eye icon)
 $visibility = $lp->getEntity()->isVisible($courseEntity, $sessionEntity);
 
-if ($visibility === false &&
+if (false === $visibility &&
     !api_is_allowed_to_edit(false, true, false, false)
 ) {
     api_not_allowed(true);
@@ -118,7 +118,7 @@ $(function() {
 var chamilo_xajax_handler = window.oxajax;
 </script>';
 
-$allowLpItemTip = api_get_configuration_value('hide_accessibility_label_on_lp_item') === false;
+$allowLpItemTip = false === api_get_configuration_value('hide_accessibility_label_on_lp_item');
 if ($allowLpItemTip) {
     $htmlHeadXtra[] = '<script>
     $(function() {
@@ -154,7 +154,7 @@ if ($allowLpItemTip) {
 }
 
 // Impress js
-if ($lp->mode === 'impress') {
+if ('impress' === $lp->mode) {
     $lp_id = $lp->get_id();
     $url = api_get_path(WEB_CODE_PATH)."lp/lp_impress.php?lp_id=$lp_id&".api_get_cidreq();
     header("Location: $url");
@@ -192,7 +192,7 @@ $get_teacher_buttons = $lp->get_teacher_toc_buttons();
 
 $type_quiz = false;
 foreach ($get_toc_list as $toc) {
-    if ($toc['id'] == $lp_item_id && $toc['type'] == 'quiz') {
+    if ($toc['id'] == $lp_item_id && 'quiz' == $toc['type']) {
         $type_quiz = true;
     }
 }
@@ -205,7 +205,7 @@ if (!isset($src)) {
             $htmlHeadXtra[] = '<script src="scorm_api.php" type="text/javascript" language="javascript"></script>';
             $preReqCheck = $lp->prerequisites_match($lp_item_id);
 
-            if ($preReqCheck === true) {
+            if (true === $preReqCheck) {
                 $src = $lp->get_link(
                     'http',
                     $lp_item_id,
@@ -219,7 +219,7 @@ if (!isset($src)) {
                 }
 
                 if (isset($file_info['extension']) &&
-                    api_strtolower(substr($file_info['extension'], 0, 3)) == 'pdf'
+                    'pdf' == api_strtolower(substr($file_info['extension'], 0, 3))
                 ) {
                     $src = api_get_path(WEB_CODE_PATH).'lp/lp_view_item.php?lp_item_id='.$lp_item_id.'&'.api_get_cidreq();
                 }
@@ -235,7 +235,7 @@ if (!isset($src)) {
             $lp->stop_previous_item(); // save status manually if asset
             $htmlHeadXtra[] = '<script src="scorm_api.php" type="text/javascript" language="javascript"></script>';
             $preReqCheck = $lp->prerequisites_match($lp_item_id);
-            if ($preReqCheck === true) {
+            if (true === $preReqCheck) {
                 $src = $lp->get_link('http', $lp_item_id, $get_toc_list);
                 $lp->start_current_item(); // starts time counter manually if asset
             } else {
@@ -247,7 +247,7 @@ if (!isset($src)) {
             $lp->stop_previous_item(); // save status manually if asset
             $htmlHeadXtra[] = '<script src="'.$lp->get_js_lib().'" type="text/javascript" language="javascript"></script>';
             $preReqCheck = $lp->prerequisites_match($lp_item_id);
-            if ($preReqCheck === true) {
+            if (true === $preReqCheck) {
                 $src = $lp->get_link(
                     'http',
                     $lp_item_id,
@@ -348,7 +348,7 @@ if (!empty($_REQUEST['exeId']) &&
             Database::query($sql);
         }
     }
-    if (intval($_GET['fb_type']) != EXERCISE_FEEDBACK_TYPE_END) {
+    if (EXERCISE_FEEDBACK_TYPE_END != intval($_GET['fb_type'])) {
         $src = 'blank.php?msg=exerciseFinished';
     } else {
         $src = api_get_path(WEB_CODE_PATH).'exercise/result.php?id='.$safe_exe_id.'&'.api_get_cidreq(true, true, 'learnpath');
@@ -368,7 +368,7 @@ $_setting['show_navigation_menu'] = 'false';
 $scorm_css_header = true;
 $lp_theme_css = $lp->get_theme();
 // Sets the css theme of the LP this call is also use at the frames (toc, nav, message).
-if ($lp->mode == 'fullscreen') {
+if ('fullscreen' == $lp->mode) {
     $htmlHeadXtra[] = "<script>
         window.open('$src','content_id','toolbar=0,location=0,status=0,scrollbars=1,resizable=1');
     </script>";
@@ -384,7 +384,7 @@ $scorm_css_header = true;
 $lp_theme_css = $lp->get_theme();
 
 // Setting up the CSS theme if exists.
-if (!empty($lp_theme_css) && !empty($mycourselptheme) && $mycourselptheme != -1 && $mycourselptheme == 1) {
+if (!empty($lp_theme_css) && !empty($mycourselptheme) && -1 != $mycourselptheme && 1 == $mycourselptheme) {
     global $lp_theme_css;
 } else {
     $lp_theme_css = $my_style;
@@ -473,9 +473,9 @@ if ($lp->current == $lp->get_last()) {
         $gradebookEvaluations = $categories[0]->get_evaluations();
         $gradebookLinks = $categories[0]->get_links();
 
-        if (count($gradebookEvaluations) === 0 &&
-            count($gradebookLinks) === 1 &&
-            $gradebookLinks[0]->get_type() == LINK_LEARNPATH &&
+        if (0 === count($gradebookEvaluations) &&
+            1 === count($gradebookLinks) &&
+            LINK_LEARNPATH == $gradebookLinks[0]->get_type() &&
             $gradebookLinks[0]->get_ref_id() == $lp->lp_id
         ) {
             $gradebookMinScore = $categories[0]->getCertificateMinScore();
@@ -520,7 +520,7 @@ $template->assign('toc_list', $get_toc_list);
 $template->assign('teacher_toc_buttons', $get_teacher_buttons);
 $template->assign('iframe_src', $src);
 $template->assign('navigation_bar_bottom', $navigation_bar_bottom);
-$template->assign('show_left_column', $lp->getHideTableOfContents() == 0);
+$template->assign('show_left_column', 0 == $lp->getHideTableOfContents());
 
 $showMenu = 0;
 $settings = api_get_configuration_value('lp_view_settings');
@@ -531,7 +531,7 @@ if (!empty($display)) {
 
 $template->assign('show_toolbar_by_default', $showMenu);
 
-if ($gamificationMode == 1) {
+if (1 == $gamificationMode) {
     $template->assign('gamification_stars', $lp->getCalculateStars($sessionId));
     $template->assign('gamification_points', $lp->getCalculateScore($sessionId));
 }
@@ -584,7 +584,7 @@ if (Tracking::minimumTimeAvailable(api_get_session_id(), api_get_course_int_id()
 $template->assign('lp_accumulate_work_time', $lpMinTime);
 $template->assign('lp_mode', $lp->mode);
 $template->assign('lp_title_scorm', $lp->get_name());
-if (api_get_configuration_value('lp_view_accordion') === true && $lpType == 1) {
+if (true === api_get_configuration_value('lp_view_accordion') && 1 == $lpType) {
     $template->assign('data_panel', $lp->getParentToc($get_toc_list));
 } else {
     $template->assign('data_list', $lp->getListArrayToc($get_toc_list));
diff --git a/public/main/lp/lp_view_item.php b/public/main/lp/lp_view_item.php
index 5d4aad0f6a..b021616d80 100644
--- a/public/main/lp/lp_view_item.php
+++ b/public/main/lp/lp_view_item.php
@@ -10,8 +10,6 @@ use ChamiloSession as Session;
  * @author Denes Nagy
  * @author Roan Embrechts, refactoring and code cleaning
  * @author Yannick Warnier <ywarnier@beeznest.org> - cleaning and update for new SCORM tool
- *
- * @package chamilo.learnpath
  */
 
 // Prevents FF 3.6 + Adobe Reader 9 bug see BT#794 when calling a pdf file in a LP
@@ -89,7 +87,7 @@ $interbreadcrumb[] = [
 $show_learn_path = true;
 $lp_theme_css = $lp->get_theme();
 
-if ($mode == 'fullpage') {
+if ('fullpage' == $mode) {
     Display::display_header(get_lang('Item'), 'Path');
 }
 
diff --git a/public/main/lp/openoffice_document.class.php b/public/main/lp/openoffice_document.class.php
index 87d4093960..84b7fb0169 100644
--- a/public/main/lp/openoffice_document.class.php
+++ b/public/main/lp/openoffice_document.class.php
@@ -6,8 +6,6 @@
  * Defines the OpenofficeDocument class, which is meant as a mother class
  * to help in the conversion of Office documents to learning paths.
  *
- * @package chamilo.learnpath
- *
  * @author	Eric Marguin <eric.marguin@dokeos.com>
  * @author Julio Montoya
  * @license	GNU/GPL
@@ -58,7 +56,7 @@ abstract class OpenofficeDocument extends learnpath
         $this->base_work_dir = api_get_path(SYS_COURSE_PATH).$_course['path'].'/document';
         ///learning_path/ppt_dirname directory
         $this->created_dir = $result['dir'];
-        if (substr($this->created_dir, -1, 1) == '/') {
+        if ('/' == substr($this->created_dir, -1, 1)) {
             $this->file_path = $this->created_dir.api_replace_dangerous_char($file['name']);
         } else {
             $this->file_path = $this->created_dir.'/'.api_replace_dangerous_char($file['name']);
@@ -102,7 +100,7 @@ abstract class OpenofficeDocument extends learnpath
 
         $ppt2lp_host = api_get_setting('service_ppt2lp', 'host');
 
-        if ($ppt2lp_host == 'localhost') {
+        if ('localhost' == $ppt2lp_host) {
             move_uploaded_file($file['tmp_name'], $this->base_work_dir.'/'.$this->file_path);
             //var_dump( $this->base_work_dir.$this->created_dir.$this->file_path);
             $perm = api_get_setting('permissions_for_new_files');
@@ -134,7 +132,7 @@ abstract class OpenofficeDocument extends learnpath
             $return = 0;
             $shell = exec($cmd, $files, $return);
 
-            if ($return != 0) { // If the java application returns an error code.
+            if (0 != $return) { // If the java application returns an error code.
                 switch ($return) {
                     case 1:
                         // Can't connect to openoffice.
@@ -224,7 +222,7 @@ abstract class OpenofficeDocument extends learnpath
             return $ids;
         }
 
-        if ($ppt2lpHost == 'localhost') {
+        if ('localhost' == $ppt2lpHost) {
             if (IS_WINDOWS_OS) { // IS_WINDOWS_OS has been defined in main_api.lib.php
                 $converterPath = str_replace('/', '\\', api_get_path(SYS_PATH).'main/inc/lib/ppt2png');
                 $classPath = $converterPath.';'.$converterPath.'/jodconverter-2.2.2.jar;'.$converterPath.'/jodconverter-cli-2.2.2.jar';
@@ -252,7 +250,7 @@ abstract class OpenofficeDocument extends learnpath
             @chown($this->base_work_dir.'/'.$this->created_dir, 'www-data');
             @chmod($this->base_work_dir.'/'.$this->created_dir, $permissionFile);
 
-            if ($return != 0) { // If the java application returns an error code.
+            if (0 != $return) { // If the java application returns an error code.
                 switch ($return) {
                     case 1:
                         // Can't connect to openoffice.
@@ -352,7 +350,7 @@ abstract class OpenofficeDocument extends learnpath
             'features' => SOAP_SINGLE_ELEMENT_ARRAYS,
             'compression' => SOAP_COMPRESSION_ACCEPT | SOAP_COMPRESSION_GZIP | 9,
         ];
-        if (substr($ppt2lp_host, 0, 5) === 'https') {
+        if ('https' === substr($ppt2lp_host, 0, 5)) {
             $options['ssl_method'] = SOAP_SSL_METHOD_TLS;
             // If using SSL, please note that *not* supporting the SSLv2
             // (broken in terms of security), the server tends to generate
diff --git a/public/main/lp/openoffice_presentation.class.php b/public/main/lp/openoffice_presentation.class.php
index d633f46672..47c2d72975 100644
--- a/public/main/lp/openoffice_presentation.class.php
+++ b/public/main/lp/openoffice_presentation.class.php
@@ -6,8 +6,6 @@
  * tool from Office presentations (.ppt, .sxi, .odp, .pptx) to
  * learning paths.
  *
- * @package chamilo.learnpath
- *
  * @author  Eric Marguin <eric.marguin@dokeos.com>
  * @license GNU/GPL
  */
@@ -17,7 +15,7 @@
  */
 require_once 'openoffice_document.class.php';
 
-if (api_get_setting('search_enabled') == 'true') {
+if ('true' == api_get_setting('search_enabled')) {
     require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
 }
 
@@ -41,7 +39,7 @@ class OpenofficePresentation extends OpenofficeDocument
             return false;
         }
         $dir = $this->created_dir;
-        if (substr($dir, -1, 1) !== '/') {
+        if ('/' !== substr($dir, -1, 1)) {
             $dir .= '/';
         }
 
@@ -57,19 +55,19 @@ class OpenofficePresentation extends OpenofficeDocument
             $slide_name = api_convert_encoding($slide_name, api_get_system_encoding(), $this->original_charset);
             $slide_name = api_html_entity_decode($slide_name, ENT_COMPAT, api_get_system_encoding());
 
-            if ($this->take_slide_name === true) {
+            if (true === $this->take_slide_name) {
                 $slide_name = str_replace('_', ' ', $slide_name);
                 $slide_name = api_ucfirst($slide_name);
             } else {
                 $slide_name = 'slide'.str_repeat('0', 2 - strlen($i)).$i;
             }
 
-            if (!is_file($this->base_work_dir.$dir.$file_name) or filesize($this->base_work_dir.$dir.$file_name) == 0) {
+            if (!is_file($this->base_work_dir.$dir.$file_name) or 0 == filesize($this->base_work_dir.$dir.$file_name)) {
                 continue;
             }
 
             $i++;
-            if (substr($file_name, -1, 1) == '/') {
+            if ('/' == substr($file_name, -1, 1)) {
                 $file_name = substr($file_name, 0, -1);
             }
             // Add the png to documents.
@@ -181,12 +179,12 @@ class OpenofficePresentation extends OpenofficeDocument
                     $slide_name,
                     ''
                 );
-                if ($this->first_item == 0) {
+                if (0 == $this->first_item) {
                     $this->first_item = intval($previous);
                 }
             }
             // Code for text indexing.
-            if (api_get_setting('search_enabled') == 'true') {
+            if ('true' == api_get_setting('search_enabled')) {
                 if (isset($_POST['index_document']) && $_POST['index_document']) {
                     $di = new ChamiloIndexer();
                     isset($_POST['language']) ? $lang = Database::escape_string($_POST['language']) : $lang = 'english';
diff --git a/public/main/lp/openoffice_text.class.php b/public/main/lp/openoffice_text.class.php
index 72ccde781a..42a13e1ffc 100644
--- a/public/main/lp/openoffice_text.class.php
+++ b/public/main/lp/openoffice_text.class.php
@@ -6,8 +6,6 @@
  * tool from Office text documents (.doc, .sxw, .odt, .docx) to
  * learning paths.
  *
- * @package chamilo.learnpath
- *
  * @author  Eric Marguin <eric.marguin@dokeos.com>
  * @license GNU/GPL
  */
@@ -16,13 +14,10 @@
  * Defines the "OpenofficeText" child of class "learnpath".
  */
 require_once 'openoffice_document.class.php';
-if (api_get_setting('search_enabled') == 'true') {
+if ('true' == api_get_setting('search_enabled')) {
     require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
 }
 
-/**
- * @package chamilo.learnpath.OpenofficeDocument
- */
 class OpenofficeText extends OpenofficeDocument
 {
     public $split_steps;
@@ -129,7 +124,7 @@ class OpenofficeText extends OpenofficeDocument
         // Empty the fake chapters.
         $new_index = 0;
         for ($i = 0; $i < count($matches_temp[0]); $i++) {
-            if (trim($matches_temp[1][$i]) !== '') {
+            if ('' !== trim($matches_temp[1][$i])) {
                 $matches[0][$new_index] = $matches_temp[0][$i];
                 $matches[1][$new_index] = $matches_temp[1][$i];
                 $new_index++;
@@ -201,7 +196,7 @@ class OpenofficeText extends OpenofficeDocument
                     $slide_name,
                     ''
                 );
-                if ($this->first_item == 0) {
+                if (0 == $this->first_item) {
                     $this->first_item = $previous;
                 }
             }
@@ -257,11 +252,11 @@ class OpenofficeText extends OpenofficeDocument
                 $infos = pathinfo($this->filepath);
                 $slide_name = 'Page '.str_repeat('0', 2 - strlen($key)).$key;
                 $previous = learnpath::add_item(0, $previous, 'document', $document_id, $slide_name, '');
-                if ($this->first_item == 0) {
+                if (0 == $this->first_item) {
                     $this->first_item = $previous;
                 }
                 // Code for text indexing.
-                if (api_get_setting('search_enabled') == 'true') {
+                if ('true' == api_get_setting('search_enabled')) {
                     if (isset($_POST['index_document']) && $_POST['index_document']) {
                         //echo Display::return_message(print_r($_POST));
                         $di = new ChamiloIndexer();
diff --git a/public/main/lp/openoffice_text_document.class.php b/public/main/lp/openoffice_text_document.class.php
index 96e9b58c2f..edadff4067 100644
--- a/public/main/lp/openoffice_text_document.class.php
+++ b/public/main/lp/openoffice_text_document.class.php
@@ -6,8 +6,6 @@
  * tool from Office text documents (.doc, .sxw, .odt, .docx) to
  * learning paths.
  *
- * @package chamilo.learnpath
- *
  * @author  Eric Marguin <eric.marguin@dokeos.com>
  * @license GNU/GPL
  */
@@ -17,9 +15,6 @@
 require_once 'openoffice_document.class.php';
 require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
 
-/**
- * @package chamilo.learnpath.openofficedocument
- */
 class OpenOfficeTextDocument extends OpenofficeDocument
 {
     public $split_steps;
@@ -122,7 +117,7 @@ class OpenOfficeTextDocument extends OpenofficeDocument
         // Empty the fake dir/chapters.
         $new_index = 0;
         for ($i = 0; $i < count($matches_temp[0]); $i++) {
-            if (trim($matches_temp[1][$i]) !== '') {
+            if ('' !== trim($matches_temp[1][$i])) {
                 $matches[0][$new_index] = $matches_temp[0][$i];
                 $matches[1][$new_index] = $matches_temp[1][$i];
                 $new_index++;
@@ -193,7 +188,7 @@ class OpenOfficeTextDocument extends OpenofficeDocument
                     $slide_name,
                     ''
                 );
-                if ($this->first_item == 0) {
+                if (0 == $this->first_item) {
                     $this->first_item = (int) $previous;
                 }
             }
@@ -259,7 +254,7 @@ class OpenOfficeTextDocument extends OpenofficeDocument
                     $slide_name,
                     ''
                 );
-                if ($this->first_item == 0) {
+                if (0 == $this->first_item) {
                     $this->first_item = (int) $previous;
                 }
                 // Code for text indexing.
diff --git a/public/main/lp/readout_text.php b/public/main/lp/readout_text.php
index afbf2de4d0..77beef2291 100644
--- a/public/main/lp/readout_text.php
+++ b/public/main/lp/readout_text.php
@@ -5,8 +5,6 @@ use Chamilo\CourseBundle\Entity\CDocument;
 
 /**
  * Print a read-out text inside a session.
- *
- * @package chamilo.learnpath
  */
 $_in_course = true;
 
diff --git a/public/main/lp/scorm.class.php b/public/main/lp/scorm.class.php
index 71f233a4fa..f2248ef5bf 100644
--- a/public/main/lp/scorm.class.php
+++ b/public/main/lp/scorm.class.php
@@ -9,8 +9,6 @@ use Symfony\Component\DomCrawler\Crawler;
 /**
  * Defines the scorm class, which is meant to contain the scorm items (nuclear elements).
  *
- * @package chamilo.learnpath
- *
  * @author    Yannick Warnier <ywarnier@beeznest.org>
  */
 class scorm extends learnpath
@@ -121,7 +119,7 @@ class scorm extends learnpath
 
             if ($root->hasAttributes()) {
                 $attributes = $root->attributes;
-                if ($attributes->length !== 0) {
+                if (0 !== $attributes->length) {
                     foreach ($attributes as $attrib) {
                         // <manifest> element attributes
                         $this->manifest[$attrib->name] = $attrib->value;
@@ -131,10 +129,10 @@ class scorm extends learnpath
             $this->manifest['name'] = $root->tagName;
             if ($root->hasChildNodes()) {
                 $children = $root->childNodes;
-                if ($children->length !== 0) {
+                if (0 !== $children->length) {
                     foreach ($children as $child) {
                         // <manifest> element children (can be <metadata>, <organizations> or <resources> )
-                        if ($child->nodeType == XML_ELEMENT_NODE) {
+                        if (XML_ELEMENT_NODE == $child->nodeType) {
                             switch ($child->tagName) {
                                 case 'metadata':
                                     // Parse items from inside the <metadata> element.
@@ -146,7 +144,7 @@ class scorm extends learnpath
                                     $orgs_attribs = $child->attributes;
                                     foreach ($orgs_attribs as $orgs_attrib) {
                                         // Attributes of the <organizations> element.
-                                        if ($orgs_attrib->nodeType == XML_ATTRIBUTE_NODE) {
+                                        if (XML_ATTRIBUTE_NODE == $orgs_attrib->nodeType) {
                                             $this->manifest['organizations'][$orgs_attrib->name] = $orgs_attrib->value;
                                         }
                                     }
@@ -183,12 +181,12 @@ class scorm extends learnpath
                                                     $orgnode,
                                                     $this->manifest_encoding
                                                 );
-                                                if ($oOrganization->identifier != '') {
+                                                if ('' != $oOrganization->identifier) {
                                                     $name = $oOrganization->get_name();
                                                     if (empty($name)) {
                                                         // If the org title is empty, use zip file name.
                                                         $myname = $this->zipname;
-                                                        if ($this->lastzipnameindex != 0) {
+                                                        if (0 != $this->lastzipnameindex) {
                                                             $myname = $myname + $this->lastzipnameindex;
                                                             $this->lastzipnameindex++;
                                                         }
@@ -204,7 +202,7 @@ class scorm extends learnpath
                                     if ($child->hasAttributes()) {
                                         $resources_attribs = $child->attributes;
                                         foreach ($resources_attribs as $res_attr) {
-                                            if ($res_attr->type == XML_ATTRIBUTE_NODE) {
+                                            if (XML_ATTRIBUTE_NODE == $res_attr->type) {
                                                 $this->manifest['resources'][$res_attr->name] = $res_attr->value;
                                             }
                                         }
@@ -214,7 +212,7 @@ class scorm extends learnpath
                                         $i = 0;
                                         foreach ($resources_nodes as $res_node) {
                                             $oResource = new scormResource('manifest', $res_node);
-                                            if ($oResource->identifier != '') {
+                                            if ('' != $oResource->identifier) {
                                                 $this->resources[$oResource->identifier] = $oResource;
                                                 $i++;
                                             }
@@ -246,7 +244,7 @@ class scorm extends learnpath
             // Check organisations:
             if (isset($this->manifest['organizations'])) {
                 foreach ($this->manifest['organizations'] as $data) {
-                    if (strpos(strtolower($data), 'xerte') !== false) {
+                    if (false !== strpos(strtolower($data), 'xerte')) {
                         // Check if template.xml exists:
                         $templatePath = str_replace('imsmanifest.xml', 'template.xml', $file);
                         if (file_exists($templatePath) && is_file($templatePath)) {
@@ -477,7 +475,7 @@ class scorm extends learnpath
                 $title = api_utf8_decode($title);
                 $max_score = (int) $item['max_score'];
 
-                if ($max_score === 0) {
+                if (0 === $max_score) {
                     // If max score is not set The use_max_score parameter
                     // is check in order to use 100 (chamilo style) or '' (strict scorm)
                     $max_score = 'NULL';
@@ -692,7 +690,7 @@ class scorm extends learnpath
         if ($this->debug) {
             error_log("New LP - Package type is now: '$packageType'");
         }
-        if ($packageType == '') {
+        if ('' == $packageType) {
             Display::addFlash(
                 Display::return_message(get_lang('This is not a valid SCORM ZIP file !'))
             );
@@ -721,11 +719,11 @@ class scorm extends learnpath
         }
 
         // It happens on Linux that $newDir sometimes doesn't start with '/'
-        if ($newDir[0] != '/') {
+        if ('/' != $newDir[0]) {
             $newDir = '/'.$newDir;
         }
 
-        if ($newDir[strlen($newDir) - 1] == '/') {
+        if ('/' == $newDir[strlen($newDir) - 1]) {
             $newDir = substr($newDir, 0, -1);
         }
 
@@ -784,7 +782,7 @@ class scorm extends learnpath
             error_log('In scorm::set_proximity('.$proxy.') method');
         }
         $lp = $this->get_id();
-        if ($lp != 0) {
+        if (0 != $lp) {
             $tbl_lp = Database::get_course_table(TABLE_LP_MAIN);
             $sql = "UPDATE $tbl_lp SET content_local = '$proxy'
                     WHERE iid = $lp";
@@ -809,7 +807,7 @@ class scorm extends learnpath
             error_log('In scorm::set_theme('.$theme.') method');
         }
         $lp = $this->get_id();
-        if ($lp != 0) {
+        if (0 != $lp) {
             $tbl_lp = Database::get_course_table(TABLE_LP_MAIN);
             $sql = "UPDATE $tbl_lp SET theme = '$theme'
                     WHERE iid = $lp";
@@ -834,7 +832,7 @@ class scorm extends learnpath
             error_log('In scorm::set_theme('.$preview_image.') method', 0);
         }
         $lp = $this->get_id();
-        if ($lp != 0) {
+        if (0 != $lp) {
             $tbl_lp = Database::get_course_table(TABLE_LP_MAIN);
             $sql = "UPDATE $tbl_lp SET preview_image = '$preview_image'
                     WHERE iid = $lp";
@@ -859,7 +857,7 @@ class scorm extends learnpath
             error_log('In scorm::set_author('.$author.') method', 0);
         }
         $lp = $this->get_id();
-        if ($lp != 0) {
+        if (0 != $lp) {
             $tbl_lp = Database::get_course_table(TABLE_LP_MAIN);
             $sql = "UPDATE $tbl_lp SET author = '$author'
                     WHERE iid = ".$lp;
@@ -884,7 +882,7 @@ class scorm extends learnpath
             error_log('In scorm::set_maker method('.$maker.')', 0);
         }
         $lp = $this->get_id();
-        if ($lp != 0) {
+        if (0 != $lp) {
             $tbl_lp = Database::get_course_table(TABLE_LP_MAIN);
             $sql = "UPDATE $tbl_lp SET content_maker = '$maker' WHERE iid = $lp";
             $res = Database::query($sql);
@@ -1013,7 +1011,7 @@ class scorm extends learnpath
         $title = '';
         if (isset($this->manifest['organizations']['default'])) {
             $title = $this->organizations[$this->manifest['organizations']['default']]->get_name();
-        } elseif (count($this->organizations) == 1) {
+        } elseif (1 == count($this->organizations)) {
             // This will only get one title but so we don't need to know the index.
             foreach ($this->organizations as $id => $value) {
                 $title = $this->organizations[$id]->get_name();
@@ -1071,8 +1069,8 @@ class scorm extends learnpath
             $this->scorm_debug = $row['debug'];
             $this->js_lib = $row['js_lib'];
             $this->path = $row['path'];
-            if ($this->type == 2) {
-                if ($row['force_commit'] == 1) {
+            if (2 == $this->type) {
+                if (1 == $row['force_commit']) {
                     $this->force_commit = true;
                 }
             }
@@ -1081,7 +1079,7 @@ class scorm extends learnpath
         }
         // Parse the manifest (it is already in this lp's details).
         $manifest_file = api_get_path(SYS_COURSE_PATH).$courseInfo['directory'].'/scorm/'.$this->subdir.'/imsmanifest.xml';
-        if ($this->subdir == '') {
+        if ('' == $this->subdir) {
             $manifest_file = api_get_path(SYS_COURSE_PATH).$courseInfo['directory'].'/scorm/imsmanifest.xml';
         }
         echo $manifest_file;
diff --git a/public/main/lp/scormItem.class.php b/public/main/lp/scormItem.class.php
index 930d1fabe9..278b27b349 100644
--- a/public/main/lp/scormItem.class.php
+++ b/public/main/lp/scormItem.class.php
@@ -6,8 +6,6 @@
  * This class handles the <item> elements from an imsmanifest file.
  * Container for the scormItem class that deals with <item> elements in an imsmanifest file.
  *
- * @package	chamilo.learnpath.scorm
- *
  * @author	Yannick Warnier	<ywarnier@beeznest.org>
  */
 class scormItem extends learnpathItem
@@ -57,33 +55,33 @@ class scormItem extends learnpathItem
                                 switch ($child->tagName) {
                                     case 'title':
                                         $tmp_children = $child->childNodes;
-                                        if ($tmp_children->length == 1 && $child->firstChild->nodeValue != '') {
+                                        if (1 == $tmp_children->length && '' != $child->firstChild->nodeValue) {
                                             $this->title = $child->firstChild->nodeValue;
                                         }
                                         break;
                                     case 'max_score':
-                                        if ($tmp_children->length == 1 && $child->firstChild->nodeValue != '') {
+                                        if (1 == $tmp_children->length && '' != $child->firstChild->nodeValue) {
                                             $this->max_score = $child->firstChild->nodeValue;
                                         }
                                         break;
                                     case 'maxtimeallowed':
                                     case 'adlcp:maxtimeallowed':
                                         $tmp_children = $child->childNodes;
-                                        if ($tmp_children->length == 1 && $child->firstChild->nodeValue != '') {
+                                        if (1 == $tmp_children->length && '' != $child->firstChild->nodeValue) {
                                             $this->max_time_allowed = $child->firstChild->nodeValue;
                                         }
                                         break;
                                     case 'prerequisites':
                                     case 'adlcp:prerequisites':
                                         $tmp_children = $child->childNodes;
-                                        if ($tmp_children->length == 1 && $child->firstChild->nodeValue != '') {
+                                        if (1 == $tmp_children->length && '' != $child->firstChild->nodeValue) {
                                             $this->prereq_string = $child->firstChild->nodeValue;
                                         }
                                         break;
                                     case 'timelimitaction':
                                     case 'adlcp:timelimitaction':
                                         $tmp_children = $child->childNodes;
-                                        if ($tmp_children->length == 1 && $child->firstChild->nodeValue != '') {
+                                        if (1 == $tmp_children->length && '' != $child->firstChild->nodeValue) {
                                             $this->timelimitaction = $child->firstChild->nodeValue;
                                         }
                                         break;
@@ -91,20 +89,20 @@ class scormItem extends learnpathItem
                                     case 'adlcp:datafromlms':
                                     case 'adlcp:launchdata': //in some cases (Wouters)
                                         $tmp_children = $child->childNodes;
-                                        if ($tmp_children->length == 1 && $child->firstChild->nodeValue != '') {
+                                        if (1 == $tmp_children->length && '' != $child->firstChild->nodeValue) {
                                             $this->datafromlms = $child->firstChild->nodeValue;
                                         }
                                         break;
                                     case 'masteryscore':
                                     case 'adlcp:masteryscore':
                                         $tmp_children = $child->childNodes;
-                                        if ($tmp_children->length == 1 && $child->firstChild->nodeValue != '') {
+                                        if (1 == $tmp_children->length && '' != $child->firstChild->nodeValue) {
                                             $this->mastery_score = $child->firstChild->nodeValue;
                                         }
                                         break;
                                     case 'item':
                                         $oItem = new scormItem('manifest', $child);
-                                        if ($oItem->identifier != '') {
+                                        if ('' != $oItem->identifier) {
                                             $this->sub_items[$oItem->identifier] = $oItem;
                                         }
                                         break;
diff --git a/public/main/lp/scormMetadata.class.php b/public/main/lp/scormMetadata.class.php
index 9f81539112..db43824f9d 100644
--- a/public/main/lp/scormMetadata.class.php
+++ b/public/main/lp/scormMetadata.class.php
@@ -3,8 +3,6 @@
 
 /**
  * Container for the scormMetadata class, setup to hold information about the <metadata> element in imsmanifest files.
- *
- * @package chamilo.learnpath.scorm
  */
 
 /**
@@ -75,8 +73,8 @@ class scormMetadata
                                 }
                                 break;
                             case XML_TEXT_NODE:
-                                if (trim($child->textContent) != '') {
-                                    if (count($children == 1)) {
+                                if ('' != trim($child->textContent)) {
+                                    if (count(1 == $children)) {
                                         // If this is the only child at this level and it is a content... save differently.
                                         $this->text = $child->textContent;
                                     } else {
@@ -90,7 +88,7 @@ class scormMetadata
                     //$keep_href = '';
                     if (is_array($attributes)) {
                         foreach ($attributes as $attrib) {
-                            if (trim($attrib->value) != '') {
+                            if ('' != trim($attrib->value)) {
                                 $this->attribs[$attrib->name] = $attrib->value;
                             }
                         }
diff --git a/public/main/lp/scormOrganization.class.php b/public/main/lp/scormOrganization.class.php
index 27741ad03e..e569dcb69c 100644
--- a/public/main/lp/scormOrganization.class.php
+++ b/public/main/lp/scormOrganization.class.php
@@ -4,8 +4,6 @@
 /**
  * Container for the scormOrganization class.
  *
- * @package chamilo.learnpath.scorm
- *
  * @author    Yannick Warnier <ywarnier@beeznest.org>
  */
 
@@ -49,7 +47,7 @@ class scormOrganization
                                             'manifest',
                                             $child
                                         );
-                                        if ($oItem->identifier != '') {
+                                        if ('' != $oItem->identifier) {
                                             $this->items[$oItem->identifier] = $oItem;
                                         }
                                         break;
@@ -61,7 +59,7 @@ class scormOrganization
                                         break;
                                     case 'title':
                                         $tmp_children = $child->childNodes;
-                                        if ($tmp_children->length == 1 && $child->firstChild->nodeValue != '') {
+                                        if (1 == $tmp_children->length && '' != $child->firstChild->nodeValue) {
                                             $this->title = api_utf8_decode(
                                                 api_html_entity_decode(
                                                     $child->firstChild->nodeValue,
diff --git a/public/main/lp/scormResource.class.php b/public/main/lp/scormResource.class.php
index 1f59e320cb..eb145fda2f 100644
--- a/public/main/lp/scormResource.class.php
+++ b/public/main/lp/scormResource.class.php
@@ -4,8 +4,6 @@
 /**
  * Container for the scormResource class.
  *
- * @package chamilo.learnpath.scorm
- *
  * @author	Yannick Warnier <ywarnier@beeznest.org>
  */
 
diff --git a/public/main/lp/scorm_api.php b/public/main/lp/scorm_api.php
index 2ed4304ca1..c30ec1ede6 100644
--- a/public/main/lp/scorm_api.php
+++ b/public/main/lp/scorm_api.php
@@ -15,8 +15,6 @@ use ChamiloSession as Session;
  * @author   Yannick Warnier <ywarnier@beeznest.org> (extended and maintained - 2005-2014)
  *
  * @version  v 1.2
- *
- * @package  chamilo.learnpath.scorm
  */
 
 // If you open the imsmanifest.xml via local machine (f.ex.: file://c:/...), then the Apiwrapper.js
@@ -354,7 +352,7 @@ function LMSInitialize() {
         $fixLinkSetting = api_get_configuration_value('lp_fix_embed_content');
         $showGlossary = in_array($glossaryExtraTools, ['true', 'lp', 'exercise_and_lp']);
         if ($showGlossary) {
-            if (api_get_setting('show_glossary_in_documents') == 'ismanual') {
+            if ('ismanual' == api_get_setting('show_glossary_in_documents')) {
                 ?>
                 if (olms.lms_item_type == 'sco') {
                     attach_glossary_into_scorm('automatic');
@@ -362,7 +360,7 @@ function LMSInitialize() {
                     attach_glossary_into_scorm('manual');
                 }
                 <?php
-            } elseif (api_get_setting('show_glossary_in_documents') == 'isautomatic') {
+            } elseif ('isautomatic' == api_get_setting('show_glossary_in_documents')) {
                 ?>
                 attach_glossary_into_scorm('automatic');
             <?php
@@ -848,7 +846,7 @@ function LMSSetValue(param, val) {
         }
     }
     <?php
-    if ($oLP->force_commit == 1) {
+    if (1 == $oLP->force_commit) {
         echo " var mycommit = LMSCommit('force');";
     }
     ?>
@@ -1665,7 +1663,7 @@ function switch_item(current_item, next_item)
                 '&item_id=' + next_item + '&cid=' + olms.lms_course_id + '&sid=' + olms.lms_session_id;
     var cont_f = $("#content_id");
 
-    <?php if ($oLP->mode == 'fullscreen') {
+    <?php if ('fullscreen' == $oLP->mode) {
         ?>
         cont_f = window.open('' + mysrc, 'content_id', 'toolbar=0,location=0,status=0,scrollbars=1,resizable=1');
         cont_f.onload=function(){
diff --git a/public/main/mySpace/access_details.php b/public/main/mySpace/access_details.php
index 42fe059931..93f935cda1 100644
--- a/public/main/mySpace/access_details.php
+++ b/public/main/mySpace/access_details.php
@@ -4,10 +4,6 @@
 /**
  * This is the tracking library for Chamilo.
  *
- * @package chamilo.reporting
- *
- * Calculates the time spent on the course
- *
  * @param int    $user_id     the user id
  * @param string $course_code the course code
  *
@@ -157,7 +153,7 @@ $form->display();
         </div><br />
         <div id="cev_cont_stats">
             <?php
-            if ($result_to_print != '') {
+            if ('' != $result_to_print) {
                 $rst = get_stats($user_id, $courseInfo, $session_id);
                 $foo_stats = '<strong>'.get_lang('Total').': </strong>'.$rst['total'].'<br />';
                 $foo_stats .= '<strong>'.get_lang('Average').': </strong>'.$rst['avg'].'<br />';
diff --git a/public/main/mySpace/access_details_session.php b/public/main/mySpace/access_details_session.php
index 4b5c2285d2..7fda9fe989 100644
--- a/public/main/mySpace/access_details_session.php
+++ b/public/main/mySpace/access_details_session.php
@@ -92,7 +92,7 @@ function validateDate($value)
 {
     $value = DateTime::createFromFormat('d/m/Y', $value);
 
-    if ($value === false) {
+    if (false === $value) {
         return false;
     }
 
diff --git a/public/main/mySpace/admin.php b/public/main/mySpace/admin.php
index 56ea53410d..6a47e700c3 100644
--- a/public/main/mySpace/admin.php
+++ b/public/main/mySpace/admin.php
@@ -59,9 +59,9 @@ if (Database::num_rows($result_admins) > 0) {
         $firstname = $admins["firstname"];
         $email = $admins["email"];
 
-        if ($i % 2 == 0) {
+        if (0 == $i % 2) {
             $css_class = "row_odd";
-            if ($i % 20 == 0 && $i != 0) {
+            if (0 == $i % 20 && 0 != $i) {
                 if (api_is_western_name_order()) {
                     echo '<tr><th>'.get_lang('First name').'</th><th>'.get_lang('Last name').'</th><th>'.get_lang('e-mail').'</th></tr>';
                 } else {
diff --git a/public/main/mySpace/admin_view.php b/public/main/mySpace/admin_view.php
index b308819913..3ba4e560f1 100644
--- a/public/main/mySpace/admin_view.php
+++ b/public/main/mySpace/admin_view.php
@@ -7,7 +7,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
 
-$exportCSV = isset($_GET['export']) && $_GET['export'] === 'csv' ? true : false;
+$exportCSV = isset($_GET['export']) && 'csv' === $_GET['export'] ? true : false;
 $display = isset($_GET['display']) ? Security::remove_XSS($_GET['display']) : null;
 
 $htmlHeadXtra[] = api_get_jqgrid_js();
@@ -23,13 +23,13 @@ if (!$allowToTrack) {
 }
 
 if ($exportCSV) {
-    if ($display === 'user') {
+    if ('user' === $display) {
         MySpace::export_tracking_user_overview();
         exit;
-    } elseif ($display === 'session') {
+    } elseif ('session' === $display) {
         MySpace::export_tracking_session_overview();
         exit;
-    } elseif ($display === 'course') {
+    } elseif ('course' === $display) {
         MySpace::export_tracking_course_overview();
         exit;
     }
diff --git a/public/main/mySpace/coaches.php b/public/main/mySpace/coaches.php
index b6c93b93e0..97e0bb454b 100644
--- a/public/main/mySpace/coaches.php
+++ b/public/main/mySpace/coaches.php
@@ -135,15 +135,15 @@ if (Database::num_rows($result_coachs) > 0) {
             $nb_seconds += ($timestamp_logout_date - $timestamp_login_date);
         }
 
-        if ($nb_seconds == 0) {
+        if (0 == $nb_seconds) {
             $s_connection_time = '';
         } else {
             $s_connection_time = api_time_to_hms($nb_seconds);
         }
 
-        if ($i % 2 == 0) {
+        if (0 == $i % 2) {
             $css_class = "row_odd";
-            if ($i % 20 == 0 && $i != 0) {
+            if (0 == $i % 20 && 0 != $i) {
                 if (api_is_western_name_order()) {
                     echo '<tr>
 					    <th>'.get_lang('First name').'</th>
diff --git a/public/main/mySpace/company_reports.php b/public/main/mySpace/company_reports.php
index b8ae9341b9..c2e20a56f4 100644
--- a/public/main/mySpace/company_reports.php
+++ b/public/main/mySpace/company_reports.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Special report for corporate users.
- *
- * @package chamilo.reporting
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/mySpace/company_reports_resumed.php b/public/main/mySpace/company_reports_resumed.php
index 0bc3fddb86..5d61657343 100644
--- a/public/main/mySpace/company_reports_resumed.php
+++ b/public/main/mySpace/company_reports_resumed.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Special report for corporate users.
- *
- * @package chamilo.reporting
  */
 $cidReset = true;
 
@@ -49,7 +47,7 @@ $column_model = [
 
 if (!empty($extra_fields)) {
     foreach ($extra_fields as $extra) {
-        if ($extra['1'] == 'ruc') {
+        if ('ruc' == $extra['1']) {
             continue;
         }
         $col = [
diff --git a/public/main/mySpace/course.php b/public/main/mySpace/course.php
index 332247bca8..63b096a82a 100644
--- a/public/main/mySpace/course.php
+++ b/public/main/mySpace/course.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Courses reporting.
- *
- * @package chamilo.reporting
  */
 ob_start();
 $cidReset = true;
@@ -24,19 +22,19 @@ if (!$allowToTrack) {
 
 $interbreadcrumb[] = ["url" => "index.php", "name" => get_lang('Reporting')];
 
-if (isset($_GET["id_session"]) && $_GET["id_session"] != "") {
+if (isset($_GET["id_session"]) && "" != $_GET["id_session"]) {
     $interbreadcrumb[] = ["url" => "session.php", "name" => get_lang('Course sessions')];
 }
 
-if (isset($_GET["user_id"]) && $_GET["user_id"] != "" && isset($_GET["type"]) && $_GET["type"] == "coach") {
+if (isset($_GET["user_id"]) && "" != $_GET["user_id"] && isset($_GET["type"]) && "coach" == $_GET["type"]) {
     $interbreadcrumb[] = ["url" => "coaches.php", "name" => get_lang('Coaches')];
 }
 
-if (isset($_GET["user_id"]) && $_GET["user_id"] != "" && isset($_GET["type"]) && $_GET["type"] == "student") {
+if (isset($_GET["user_id"]) && "" != $_GET["user_id"] && isset($_GET["type"]) && "student" == $_GET["type"]) {
     $interbreadcrumb[] = ["url" => "student.php", "name" => get_lang('Learners')];
 }
 
-if (isset($_GET["user_id"]) && $_GET["user_id"] != "" && !isset($_GET["type"])) {
+if (isset($_GET["user_id"]) && "" != $_GET["user_id"] && !isset($_GET["type"])) {
     $interbreadcrumb[] = ["url" => "teachers.php", "name" => get_lang('Teachers')];
 }
 
@@ -49,7 +47,7 @@ function count_courses()
 
 // Checking if the current coach is the admin coach
 $showImportIcon = false;
-if (api_get_setting('add_users_by_coach') == 'true') {
+if ('true' == api_get_setting('add_users_by_coach')) {
     if (!api_is_platform_admin()) {
         $isGeneralCoach = SessionManager::user_is_general_coach(
             api_get_user_id(),
@@ -174,7 +172,7 @@ function get_count_courses()
         }
     }
 
-    if ($drhLoaded == false) {
+    if (false == $drhLoaded) {
         $isGeneralCoach = SessionManager::user_is_general_coach(
             api_get_user_id(),
             $sessionId
@@ -232,7 +230,7 @@ function get_courses($from, $limit, $column, $direction)
         }
     }
 
-    if ($drhLoaded == false) {
+    if (false == $drhLoaded) {
         $isGeneralCoach = SessionManager::user_is_general_coach(
             api_get_user_id(),
             $sessionId
diff --git a/public/main/mySpace/current_courses.php b/public/main/mySpace/current_courses.php
index 7567dccda8..2ac767aae5 100644
--- a/public/main/mySpace/current_courses.php
+++ b/public/main/mySpace/current_courses.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Report for current courses followed by the user.
- *
- * @package chamilo.reporting
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -29,7 +27,7 @@ if (!empty($my_courses)) {
         $course_info = api_get_course_info($course_code);
 
         //Only show open courses
-        if ($course_info['visibility'] == 0) {
+        if (0 == $course_info['visibility']) {
             continue;
         }
 
@@ -48,7 +46,7 @@ if (!empty($my_courses)) {
         $students = [];
         foreach ($tmp_students as $student) {
             $user_info = api_get_user_info($student['user_id']);
-            if ($user_info['status'] != STUDENT) {
+            if (STUDENT != $user_info['status']) {
                 continue;
             }
             $students[] = $student['user_id'];
@@ -96,7 +94,7 @@ if (!empty($my_courses)) {
                         $myavg_temp = Tracking::get_avg_student_score($student_id, $course_code, [$lp_id], $session_id);
                         $avg_progress_in_course = Tracking::get_avg_student_progress($student_id, $course_code, [$lp_id], $session_id);
 
-                        if (intval($avg_progress_in_course) == 100) {
+                        if (100 == intval($avg_progress_in_course)) {
                             $count_students_complete_all_activities++;
                         }
                         if (intval($avg_progress_in_course) > 0 && intval($avg_progress_in_course) <= 50) {
diff --git a/public/main/mySpace/exercise_category_report.php b/public/main/mySpace/exercise_category_report.php
index a5db6d2b5a..496ca5c3da 100644
--- a/public/main/mySpace/exercise_category_report.php
+++ b/public/main/mySpace/exercise_category_report.php
@@ -7,7 +7,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 
 api_protect_admin_script();
 
-$exportCSV = isset($_GET['export']) && $_GET['export'] === 'csv' ? true : false;
+$exportCSV = isset($_GET['export']) && 'csv' === $_GET['export'] ? true : false;
 
 // the section (for the tabs)
 $this_section = SECTION_TRACKING;
diff --git a/public/main/mySpace/index.php b/public/main/mySpace/index.php
index 85e866c65b..1e43fab324 100644
--- a/public/main/mySpace/index.php
+++ b/public/main/mySpace/index.php
@@ -3,8 +3,6 @@
 
 /**
  * Homepage for the MySpace directory.
- *
- * @package chamilo.reporting
  */
 
 // resetting the course id
@@ -22,7 +20,7 @@ $this_section = SECTION_TRACKING;
 
 ob_start();
 $nameTools = get_lang('Reporting');
-$export_csv = isset($_GET['export']) && $_GET['export'] === 'csv' ? true : false;
+$export_csv = isset($_GET['export']) && 'csv' === $_GET['export'] ? true : false;
 $display = isset($_GET['display']) ? Security::remove_XSS($_GET['display']) : null;
 $csv_content = [];
 $user_id = api_get_user_id();
@@ -59,11 +57,11 @@ if (isset($_GET['view']) && in_array($_GET['view'], $views)) {
 }
 
 $menu_items = [];
-$pluginCalendar = api_get_plugin_setting('learning_calendar', 'enabled') === 'true';
+$pluginCalendar = 'true' === api_get_plugin_setting('learning_calendar', 'enabled');
 $calendarMenuAdded = false;
 
 if ($is_platform_admin) {
-    if ($view == 'admin') {
+    if ('admin' == $view) {
         $menu_items[] = Display::url(
             Display::return_icon('teacher.png', get_lang('Trainer View'), [], ICON_SIZE_MEDIUM),
             api_get_self().'?view=teacher'
@@ -154,7 +152,7 @@ if ($is_drh) {
 
 $actionsRight = '';
 $actionsLeft = '';
-if ($display == 'useroverview' || $display == 'sessionoverview' || $display == 'courseoverview') {
+if ('useroverview' == $display || 'sessionoverview' == $display || 'courseoverview' == $display) {
     $actionsRight .= Display::url(
         Display::return_icon(
             'export_csv.png',
@@ -193,7 +191,7 @@ if (!empty($session_id) &&
         'index.php'
     );
     if (!api_is_platform_admin()) {
-        if (api_get_setting('add_users_by_coach') == 'true') {
+        if ('true' == api_get_setting('add_users_by_coach')) {
             if ($is_coach) {
                 $actionsLeft .= Display::url(
                     Display::return_icon(
@@ -228,7 +226,7 @@ if (!empty($session_id) &&
         api_get_path(WEB_CODE_PATH).'auth/my_progress.php'
     );
 
-    if ($pluginCalendar && api_is_teacher() && $calendarMenuAdded === false) {
+    if ($pluginCalendar && api_is_teacher() && false === $calendarMenuAdded) {
         $lpCalendar = LearningCalendarPlugin::create();
         $actionsLeft .= Display::url(
             Display::return_icon('agenda.png', $lpCalendar->get_lang('Learning calendar'), [], ICON_SIZE_MEDIUM),
@@ -319,7 +317,7 @@ $totalTimeSpent = null;
 $averageScore = null;
 $posts = null;
 
-if ($skipData === false) {
+if (false === $skipData) {
     if (!empty($students)) {
         // Students
         $studentIds = array_values($students);
diff --git a/public/main/mySpace/lp_tracking.php b/public/main/mySpace/lp_tracking.php
index 4ac53038a2..7180084e48 100644
--- a/public/main/mySpace/lp_tracking.php
+++ b/public/main/mySpace/lp_tracking.php
@@ -6,15 +6,13 @@ use Chamilo\CourseBundle\Entity\CLpItemView;
 
 /**
  * Learning paths reporting.
- *
- * @package chamilo.reporting
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
 $cidReset = true;
 $from_myspace = false;
 $from_link = '';
-if (isset($_GET['from']) && $_GET['from'] == 'myspace') {
+if (isset($_GET['from']) && 'myspace' == $_GET['from']) {
     $from_link = '&from=myspace';
     $this_section = SECTION_TRACKING;
 } else {
@@ -22,7 +20,7 @@ if (isset($_GET['from']) && $_GET['from'] == 'myspace') {
 }
 
 $session_id = isset($_REQUEST['id_session']) ? (int) $_REQUEST['id_session'] : api_get_session_id();
-$export_csv = isset($_GET['export']) && $_GET['export'] == 'csv';
+$export_csv = isset($_GET['export']) && 'csv' == $_GET['export'];
 $user_id = isset($_GET['student_id']) ? (int) $_GET['student_id'] : api_get_user_id();
 $courseCode = isset($_GET['course']) ? Security::remove_XSS($_GET['course']) : api_get_course_id();
 $origin = api_get_origin();
@@ -31,7 +29,7 @@ $csv_content = [];
 $courseInfo = api_get_course_info($courseCode);
 
 if (empty($courseInfo) || empty($lp_id)) {
-    api_not_allowed(api_get_origin() !== 'learnpath');
+    api_not_allowed('learnpath' !== api_get_origin());
 }
 $userInfo = api_get_user_info($user_id);
 $name = $userInfo['complete_name'];
@@ -44,10 +42,10 @@ if (!$isBoss &&
     !CourseManager::is_course_teacher(api_get_user_id(), $courseCode) &&
     !Tracking::is_allowed_to_coach_student(api_get_user_id(), $user_id)
 ) {
-    api_not_allowed(api_get_origin() !== 'learnpath');
+    api_not_allowed('learnpath' !== api_get_origin());
 }
 
-if ($origin === 'user_course') {
+if ('user_course' === $origin) {
     $interbreadcrumb[] = [
         'url' => api_get_path(WEB_COURSE_PATH).$courseInfo['directory'],
         'name' => $courseInfo['name'],
@@ -56,7 +54,7 @@ if ($origin === 'user_course') {
         'url' => "../user/user.php?cidReq=$courseCode",
         'name' => get_lang('Users'),
     ];
-} elseif ($origin === 'tracking_course') {
+} elseif ('tracking_course' === $origin) {
     $interbreadcrumb[] = [
         'url' => "../tracking/courseLog.php?cidReq=$courseCode&id_session=$session_id",
         'name' => get_lang('Reporting'),
@@ -118,9 +116,9 @@ switch ($action) {
         $categories = [];
         foreach ($list1 as $id => $interaction) {
             $counter++;
-            if ($counter === 1) {
+            if (1 === $counter) {
                 continue;
-            } elseif ($counter === 2) {
+            } elseif (2 === $counter) {
                 $studentName = $interaction['student_response_formatted'];
             } else {
                 $data = $interaction['student_response_formatted'];
@@ -164,14 +162,14 @@ switch ($action) {
             $total = 0;
             // Question options
             foreach ($data['options'] as $option) {
-                if ($option['result'] === 'correct') {
+                if ('correct' === $option['result']) {
                     $total++;
                     $globalTotal++;
                 }
                 $table->setCellContents($row, 0, 'Q'.$choiceCounter);
                 $table->setCellContents($row, 1, $option['student_response_formatted']);
                 $result = Display::return_icon('icon_check.png', null, [], ICON_SIZE_SMALL);
-                if ($option['result'] === 'wrong') {
+                if ('wrong' === $option['result']) {
                     $result = Display::return_icon('icon_error.png', null, [], ICON_SIZE_SMALL);
                 }
 
@@ -248,7 +246,7 @@ switch ($action) {
         );
         $table->setCellContents(0, 0, $logo);
 
-        $addLogo = (isset($_GET['add_logo']) && (int) $_GET['add_logo'] === 1);
+        $addLogo = (isset($_GET['add_logo']) && 1 === (int) $_GET['add_logo']);
         if ($addLogo) {
             $secondLogo = api_get_path(SYS_PATH).'custompages/url-images/'.api_get_current_access_url_id().'_url_image_2.png';
             $logo2 = Display::img($secondLogo, null, ['style' => 'height:70px;']);
diff --git a/public/main/mySpace/myStudents.php b/public/main/mySpace/myStudents.php
index 98e58679c9..43237f1245 100644
--- a/public/main/mySpace/myStudents.php
+++ b/public/main/mySpace/myStudents.php
@@ -62,7 +62,7 @@ if (!api_is_session_admin() &&
             );
         }
 
-        if (!api_is_course_admin() && $isTeacher == false) {
+        if (!api_is_course_admin() && false == $isTeacher) {
             if (!empty($courseInfo)) {
                 // Check if the user is tutor of the course
                 $userCourseStatus = CourseManager::get_tutor_in_course_status(
@@ -70,7 +70,7 @@ if (!api_is_session_admin() &&
                     $courseInfo['real_id']
                 );
 
-                if ($userCourseStatus != 1) {
+                if (1 != $userCourseStatus) {
                     $allowedToTrackUser = false;
                 }
             }
@@ -98,7 +98,7 @@ if ($export) {
 $csv_content = [];
 $from_myspace = false;
 $this_section = SECTION_COURSES;
-if (isset($_GET['from']) && $_GET['from'] === 'myspace') {
+if (isset($_GET['from']) && 'myspace' === $_GET['from']) {
     $from_myspace = true;
     $this_section = SECTION_TRACKING;
 }
@@ -106,7 +106,7 @@ if (isset($_GET['from']) && $_GET['from'] === 'myspace') {
 $nameTools = get_lang('Learner details');
 
 if (!empty($details)) {
-    if ($origin === 'user_course') {
+    if ('user_course' === $origin) {
         if (empty($cidReq)) {
             $interbreadcrumb[] = [
                 'url' => api_get_path(WEB_COURSE_PATH).$courseInfo['directory'],
@@ -118,13 +118,13 @@ if (!empty($details)) {
             'name' => get_lang('Users'),
         ];
     } else {
-        if ($origin === 'tracking_course') {
+        if ('tracking_course' === $origin) {
             $interbreadcrumb[] = [
                 'url' => '../tracking/courseLog.php?cidReq='.$course_code.'&id_session='.api_get_session_id(),
                 'name' => get_lang('Reporting'),
             ];
         } else {
-            if ($origin === 'resume_session') {
+            if ('resume_session' === $origin) {
                 $interbreadcrumb[] = [
                     'url' => "../session/session_list.php",
                     'name' => get_lang('Session list'),
@@ -162,7 +162,7 @@ if (!empty($details)) {
     }
     $nameTools = get_lang('Learner details in course');
 } else {
-    if ($origin === 'resume_session') {
+    if ('resume_session' === $origin) {
         $interbreadcrumb[] = [
             'url' => '../session/session_list.php',
             'name' => get_lang('Session list'),
@@ -173,7 +173,7 @@ if (!empty($details)) {
                 'name' => get_lang('Session overview'),
             ];
         }
-    } elseif ($origin === 'teacher_details') {
+    } elseif ('teacher_details' === $origin) {
         $this_section = SECTION_TRACKING;
         $interbreadcrumb[] = ['url' => 'index.php', 'name' => get_lang('Reporting')];
         $interbreadcrumb[] = ['url' => 'teachers.php', 'name' => get_lang('Trainers')];
@@ -436,7 +436,7 @@ switch ($action) {
         }
         break;
     case 'send_message':
-        if ($allowMessages === true) {
+        if (true === $allowMessages) {
             $subject = isset($_POST['subject']) ? $_POST['subject'] : '';
             $message = isset($_POST['message']) ? $_POST['message'] : '';
             $currentUserInfo = api_get_user_info();
@@ -637,7 +637,7 @@ if (api_is_drh() && !api_is_platform_admin()) {
     }
 }
 
-$pluginCalendar = api_get_plugin_setting('learning_calendar', 'enabled') === 'true';
+$pluginCalendar = 'true' === api_get_plugin_setting('learning_calendar', 'enabled');
 
 if ($pluginCalendar) {
     $plugin = LearningCalendarPlugin::create();
@@ -681,7 +681,7 @@ if (!empty($student_id) && !empty($course_code)) {
         .'</a>';
 }
 
-$notebookTeacherEnable = api_get_plugin_setting('notebookteacher', 'enable_plugin_notebookteacher') === 'true';
+$notebookTeacherEnable = 'true' === api_get_plugin_setting('notebookteacher', 'enable_plugin_notebookteacher');
 if ($notebookTeacherEnable && !empty($student_id) && !empty($course_code)) {
     // link notebookteacher
     $optionsLink = 'student_id='.$student_id.'&origin='.$origin.'&cidReq='.$course_code.'&id_session='.$sessionId;
@@ -778,7 +778,7 @@ if (!empty($courseInfo)) {
 
 // get information about connections on the platform by student
 $first_connection_date = Tracking::get_first_connection_date($user_info['user_id']);
-if ($first_connection_date == '') {
+if ('' == $first_connection_date) {
     $first_connection_date = get_lang('No connection');
 }
 
@@ -786,7 +786,7 @@ $last_connection_date = Tracking::get_last_connection_date(
     $user_info['user_id'],
     true
 );
-if ($last_connection_date == '') {
+if ('' == $last_connection_date) {
     $last_connection_date = get_lang('No connection');
 }
 
@@ -878,10 +878,10 @@ $timezone_user = UserManager::get_extra_user_data_by_field(
     'timezone'
 );
 $use_users_timezone = api_get_setting('use_users_timezone', 'timezones');
-    if ($timezone_user['timezone'] != null && $use_users_timezone === 'true') {
+    if (null != $timezone_user['timezone'] && 'true' === $use_users_timezone) {
         $timezone = $timezone_user['timezone'];
     }
-    if ($timezone !== null) {
+    if (null !== $timezone) {
         $userInfo['timezone'] = $timezone;
     }
 
@@ -895,7 +895,7 @@ $userInfo['student_score'] = $score;
 $userInfo['student_progress'] = $avg_student_progress;
 $userInfo['first_connection'] = $first_connection_date;
 $userInfo['last_connection'] = $last_connection_date;
-if ($details === 'true') {
+if ('true' === $details) {
     $userInfo['time_spent_course'] = $time_spent_on_the_course;
 }
 
@@ -903,7 +903,7 @@ $icon = '';
 $timeLegalAccept = '';
 $btn = '';
 
-if (api_get_setting('allow_terms_conditions') === 'true') {
+if ('true' === api_get_setting('allow_terms_conditions')) {
     $isBoss = UserManager::userIsBossOfStudent(api_get_user_id(), $student_id);
     if ($isBoss || api_is_platform_admin()) {
         $extraFieldValue = new ExtraFieldValue('user');
@@ -1338,14 +1338,14 @@ if (empty($details)) {
         $timeCourse = Tracking::getCalculateTime($student_id, $courseInfo['real_id'], $sessionId);
     }
 
-    if ($user_info['status'] != INVITEE) {
+    if (INVITEE != $user_info['status']) {
         $csv_content[] = [];
         $csv_content[] = [str_replace('&nbsp;', '', strip_tags($userInfo['complete_name']))];
         $trackingColumns = api_get_configuration_value('tracking_columns');
         if (isset($trackingColumns['my_students_lp'])) {
             foreach ($columnHeaders as $key => $value) {
                 if (!isset($trackingColumns['my_progress_lp'][$key]) ||
-                    $trackingColumns['my_students_lp'][$key] == false
+                    false == $trackingColumns['my_students_lp'][$key]
                 ) {
                     unset($columnHeaders[$key]);
                 }
@@ -1426,7 +1426,7 @@ if (empty($details)) {
                     $sessionId
                 );
 
-                if ($progress === null) {
+                if (null === $progress) {
                     $progress = '0%';
                 } else {
                     $any_result = true;
@@ -1501,7 +1501,7 @@ if (empty($details)) {
                     $bestScore = $bestScore.'%';
                 }
 
-                if ($i % 2 == 0) {
+                if (0 == $i % 2) {
                     $css_class = 'row_even';
                 } else {
                     $css_class = 'row_odd';
@@ -1559,7 +1559,7 @@ if (empty($details)) {
 
                 $csv_content[] = $contentToExport;
 
-                if ($any_result === true) {
+                if (true === $any_result) {
                     $from = '';
                     if ($from_myspace) {
                         $from = '&from=myspace';
@@ -1574,7 +1574,7 @@ if (empty($details)) {
 
                 if (api_is_allowed_to_edit()) {
                     echo '<td>';
-                    if ($any_result === true) {
+                    if (true === $any_result) {
                         $url = 'myStudents.php?action=reset_lp&sec_token='.$token.'&cidReq='.$course_code.'&course='
                             .$course_code.'&details='.$details.'&origin='.$origin.'&lp_id='.$lp_id.'&student='
                             .$user_info['user_id'].'&details=true&id_session='.$sessionId;
@@ -1598,7 +1598,7 @@ if (empty($details)) {
         }
     }
 
-    if ($user_info['status'] != INVITEE) {
+    if (INVITEE != $user_info['status']) {
         echo '<div class="table-responsive">
         <table class="table table-striped table-hover">
         <thead>
@@ -1915,7 +1915,7 @@ if (empty($details)) {
     ];
 } //end details
 
-if ($allowMessages === true) {
+if (true === $allowMessages) {
     // Messages
     echo Display::page_subheader2(get_lang('Messages'));
     echo MessageManager::getMessagesAboutUserToString($user_info);
diff --git a/public/main/mySpace/my_career.php b/public/main/mySpace/my_career.php
index 1c0f60c1f7..e00601f852 100644
--- a/public/main/mySpace/my_career.php
+++ b/public/main/mySpace/my_career.php
@@ -5,7 +5,7 @@ use Fhaculty\Graph\Graph;
 
 require_once __DIR__.'/../inc/global.inc.php';
 
-if (api_get_configuration_value('allow_career_diagram') == false) {
+if (false == api_get_configuration_value('allow_career_diagram')) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/mySpace/progression.php b/public/main/mySpace/progression.php
index c0a18cbeaf..b8b81f3faa 100644
--- a/public/main/mySpace/progression.php
+++ b/public/main/mySpace/progression.php
@@ -53,7 +53,7 @@ if (Database::num_rows($result_course) > 0) {
             $result = $result + $moy_test['score'];
             $weighting = $weighting + $moy_test['max_score'];
         }
-        if ($weighting != 0) {
+        if (0 != $weighting) {
             $moyenne_test = round(($result * 100) / $weighting);
         } else {
             $moyenne_test = null;
diff --git a/public/main/mySpace/session.php b/public/main/mySpace/session.php
index 2cfeea537f..f389101244 100644
--- a/public/main/mySpace/session.php
+++ b/public/main/mySpace/session.php
@@ -3,8 +3,6 @@
 
 /**
  * Course sessions reporting.
- *
- * @package chamilo.reporting
  */
 ob_start();
 $cidReset = true;
@@ -14,12 +12,12 @@ api_block_anonymous_users();
 
 $this_section = SECTION_TRACKING;
 $export_csv = false;
-if (isset($_REQUEST['export']) && $_REQUEST['export'] == 'csv') {
+if (isset($_REQUEST['export']) && 'csv' == $_REQUEST['export']) {
     $export_csv = true;
 }
 
 $id_coach = api_get_user_id();
-if (isset($_REQUEST['id_coach']) && $_REQUEST['id_coach'] != '') {
+if (isset($_REQUEST['id_coach']) && '' != $_REQUEST['id_coach']) {
     $id_coach = (int) $_REQUEST['id_coach'];
 }
 
diff --git a/public/main/mySpace/student.php b/public/main/mySpace/student.php
index d827797dce..abf5e600b5 100644
--- a/public/main/mySpace/student.php
+++ b/public/main/mySpace/student.php
@@ -3,8 +3,6 @@
 
 /**
  * Report on students subscribed to courses I am teaching.
- *
- * @package chamilo.reporting
  */
 $cidReset = true;
 
@@ -22,7 +20,7 @@ if (!$allowToTrack) {
 
 $nameTools = get_lang('Learners');
 
-$export_csv = isset($_GET['export']) && $_GET['export'] == 'csv' ? true : false;
+$export_csv = isset($_GET['export']) && 'csv' == $_GET['export'] ? true : false;
 $keyword = isset($_GET['keyword']) ? Security::remove_XSS($_GET['keyword']) : null;
 $active = isset($_GET['active']) ? intval($_GET['active']) : 1;
 $sleepingDays = isset($_GET['sleeping_days']) ? intval($_GET['sleeping_days']) : null;
@@ -35,14 +33,14 @@ $interbreadcrumb[] = [
     "name" => get_lang('Reporting'),
 ];
 
-if (isset($_GET["user_id"]) && $_GET["user_id"] != "" && !isset($_GET["type"])) {
+if (isset($_GET["user_id"]) && "" != $_GET["user_id"] && !isset($_GET["type"])) {
     $interbreadcrumb[] = [
         "url" => "teachers.php",
         "name" => get_lang('Teachers'),
     ];
 }
 
-if (isset($_GET["user_id"]) && $_GET["user_id"] != "" && isset($_GET["type"]) && $_GET["type"] == "coach") {
+if (isset($_GET["user_id"]) && "" != $_GET["user_id"] && isset($_GET["type"]) && "coach" == $_GET["type"]) {
     $interbreadcrumb[] = ["url" => "coaches.php", "name" => get_lang('Coaches')];
 }
 
@@ -107,7 +105,7 @@ function get_users($from, $limit, $column, $direction)
         }
     }
 
-    if ($drhLoaded === false) {
+    if (false === $drhLoaded) {
         $students = UserManager::getUsersFollowedByUser(
             api_get_user_id(),
             api_is_student_boss() ? null : STUDENT,
@@ -170,7 +168,7 @@ function get_users($from, $limit, $column, $direction)
         }
 
         $urlDetails = $url."?student=$student_id";
-        if (isset($_GET['id_coach']) && intval($_GET['id_coach']) != 0) {
+        if (isset($_GET['id_coach']) && 0 != intval($_GET['id_coach'])) {
             $urlDetails = $url."?student=$student_id&id_coach=$coach_id&id_session=$sessionId";
         }
 
diff --git a/public/main/mySpace/teachers.php b/public/main/mySpace/teachers.php
index 314fe9ae27..bcb405af01 100644
--- a/public/main/mySpace/teachers.php
+++ b/public/main/mySpace/teachers.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Teacher report.
- *
- * @package chamilo.reporting
  */
 $cidReset = true;
 
@@ -17,7 +15,7 @@ if (!$allowToTrack) {
     api_not_allowed(true);
 }
 
-$export_csv = isset($_GET['export']) && $_GET['export'] == 'csv' ? true : false;
+$export_csv = isset($_GET['export']) && 'csv' == $_GET['export'] ? true : false;
 $keyword = isset($_GET['keyword']) ? Security::remove_XSS($_GET['keyword']) : null;
 $active = isset($_GET['active']) ? intval($_GET['active']) : 1;
 $sleepingDays = isset($_GET['sleeping_days']) ? intval($_GET['sleeping_days']) : null;
@@ -26,11 +24,11 @@ $this_section = SECTION_TRACKING;
 
 $interbreadcrumb[] = ["url" => "index.php", "name" => get_lang('Reporting')];
 
-if (isset($_GET["user_id"]) && $_GET["user_id"] != "" && !isset($_GET["type"])) {
+if (isset($_GET["user_id"]) && "" != $_GET["user_id"] && !isset($_GET["type"])) {
     $interbreadcrumb[] = ["url" => "teachers.php", "name" => get_lang('Trainers')];
 }
 
-if (isset($_GET["user_id"]) && $_GET["user_id"] != "" && isset($_GET["type"]) && $_GET["type"] == "coach") {
+if (isset($_GET["user_id"]) && "" != $_GET["user_id"] && isset($_GET["type"]) && "coach" == $_GET["type"]) {
     $interbreadcrumb[] = ["url" => "coaches.php", "name" => get_lang('Coaches')];
 }
 
@@ -94,7 +92,7 @@ function get_users($from, $limit, $column, $direction)
         }
     }
 
-    if ($drhLoaded == false) {
+    if (false == $drhLoaded) {
         $students = UserManager::getUsersFollowedByUser(
             api_get_user_id(),
             COURSEMANAGER,
@@ -154,7 +152,7 @@ function get_users($from, $limit, $column, $direction)
         }
 
         $urlDetails = $url."?student=$student_id&origin=teacher_details";
-        if (isset($_GET['id_coach']) && intval($_GET['id_coach']) != 0) {
+        if (isset($_GET['id_coach']) && 0 != intval($_GET['id_coach'])) {
             $urlDetails = $url."?student=$student_id&id_coach=$coach_id&id_session=$sessionId";
         }
 
diff --git a/public/main/mySpace/user_edit.php b/public/main/mySpace/user_edit.php
index cfe1d99b31..6a01842e93 100644
--- a/public/main/mySpace/user_edit.php
+++ b/public/main/mySpace/user_edit.php
@@ -102,9 +102,9 @@ if ($form->validate()) {
         $username = $userInfo['username'];
         $send_mail = intval($user['mail']['send_mail']);
         $auth_source = PLATFORM_AUTH_SOURCE;
-        $resetPassword = $user['password']['password_auto'] == '1' ? 0 : 2;
+        $resetPassword = '1' == $user['password']['password_auto'] ? 0 : 2;
         $auth_source = $userInfo['auth_source'];
-        $password = $user['password']['password_auto'] == '1' ? api_generate_password() : $user['password']['password'];
+        $password = '1' == $user['password']['password_auto'] ? api_generate_password() : $user['password']['password'];
 
         UserManager::update_user(
             $userId,
@@ -134,7 +134,7 @@ if ($form->validate()) {
             $portal_url = api_get_path(WEB_PATH);
             if (api_is_multiple_url_enabled()) {
                 $access_url_id = api_get_current_access_url_id();
-                if ($access_url_id != -1) {
+                if (-1 != $access_url_id) {
                     $url = api_get_access_url($access_url_id);
                     $portal_url = $url['url'];
                 }
diff --git a/public/main/mySpace/user_import.php b/public/main/mySpace/user_import.php
index 11dcfca034..d4276d7df8 100644
--- a/public/main/mySpace/user_import.php
+++ b/public/main/mySpace/user_import.php
@@ -16,7 +16,7 @@ api_block_anonymous_users();
 
 $interbreadcrumb[] = ['url' => 'index.php', 'name' => get_lang('Reporting')];
 $id_session = '';
-if (isset($_GET['id_session']) && $_GET['id_session'] != '') {
+if (isset($_GET['id_session']) && '' != $_GET['id_session']) {
     $id_session = intval($_GET['id_session']);
     $interbreadcrumb[] = ['url' => 'session.php', 'name' => get_lang('Course sessions')];
     $interbreadcrumb[] = ['url' => 'course.php?id_session='.$id_session.'', 'name' => get_lang('Course')];
@@ -26,7 +26,7 @@ if (isset($_GET['id_session']) && $_GET['id_session'] != '') {
 $purification_option_for_usernames = false;
 
 // Checking whether the current coach is the admin coach.
-if (api_get_setting('add_users_by_coach') === 'true') {
+if ('true' === api_get_setting('add_users_by_coach')) {
     if (!api_is_platform_admin()) {
         if (isset($_REQUEST['id_session'])) {
             $id_session = intval($_REQUEST['id_session']);
@@ -46,10 +46,10 @@ if (api_get_setting('add_users_by_coach') === 'true') {
 
 set_time_limit(0);
 $errors = [];
-if (isset($_POST['formSent']) && $_POST['formSent'] && $_FILES['import_file']['size'] !== 0) {
+if (isset($_POST['formSent']) && $_POST['formSent'] && 0 !== $_FILES['import_file']['size']) {
     $file_type = $_POST['file_type'];
     $id_session = intval($_POST['id_session']);
-    if ($file_type == 'csv') {
+    if ('csv' == $file_type) {
         $users = MySpace::parse_csv_data($_FILES['import_file']['tmp_name']);
     } else {
         $users = MySpace::parse_xml_data($_FILES['import_file']['tmp_name']);
@@ -59,7 +59,7 @@ if (isset($_POST['formSent']) && $_POST['formSent'] && $_FILES['import_file']['s
         $errors = $results['errors'];
         $users = $results['users'];
 
-        if (count($errors) == 0) {
+        if (0 == count($errors)) {
             if (!empty($id_session)) {
                 $tbl_session_rel_course = Database::get_main_table(TABLE_MAIN_SESSION_COURSE);
                 // Selecting all the courses from the session id requested.
@@ -71,7 +71,7 @@ if (isset($_POST['formSent']) && $_POST['formSent'] && $_FILES['import_file']['s
                 }
                 $errors = MySpace::get_user_creator($users);
                 $users = MySpace::check_all_usernames($users, $course_list, $id_session);
-                if (count($errors) == 0) {
+                if (0 == count($errors)) {
                     MySpace::save_data($users, $course_list, $id_session);
                 }
             } else {
@@ -89,11 +89,11 @@ if (isset($_POST['formSent']) && $_POST['formSent'] && $_FILES['import_file']['s
 
 Display::display_header($tool_name);
 
-if (isset($_FILES['import_file']) && $_FILES['import_file']['size'] == 0 && $_POST) {
+if (isset($_FILES['import_file']) && 0 == $_FILES['import_file']['size'] && $_POST) {
     echo Display::return_message(get_lang('Required field'), 'error');
 }
 
-if (count($errors) != 0) {
+if (0 != count($errors)) {
     $error_message = '<ul>';
     foreach ($errors as $index => $error_user) {
         $error_message .= '<li><strong>'.$error_user['error'].'</strong>: ';
diff --git a/public/main/mySpace/users.php b/public/main/mySpace/users.php
index d68faa61d9..a255ccd10b 100644
--- a/public/main/mySpace/users.php
+++ b/public/main/mySpace/users.php
@@ -3,8 +3,6 @@
 
 /**
  * Report on users followed (filtered by status given in URL).
- *
- * @package chamilo.reporting
  */
 $cidReset = true;
 
@@ -21,7 +19,7 @@ if (!$allowToTrack) {
 }
 
 $nameTools = get_lang('Users');
-$export_csv = isset($_GET['export']) && $_GET['export'] == 'csv' ? true : false;
+$export_csv = isset($_GET['export']) && 'csv' == $_GET['export'] ? true : false;
 $keyword = isset($_GET['keyword']) ? Security::remove_XSS($_GET['keyword']) : null;
 $active = isset($_GET['active']) ? intval($_GET['active']) : 1;
 $sleepingDays = isset($_GET['sleeping_days']) ? intval($_GET['sleeping_days']) : null;
@@ -36,14 +34,14 @@ $interbreadcrumb[] = [
     "name" => get_lang('Reporting'),
 ];
 
-if (isset($_GET["user_id"]) && $_GET["user_id"] != "" && !isset($_GET["type"])) {
+if (isset($_GET["user_id"]) && "" != $_GET["user_id"] && !isset($_GET["type"])) {
     $interbreadcrumb[] = [
         "url" => "teachers.php",
         "name" => get_lang('Trainers'),
     ];
 }
 
-if (isset($_GET["user_id"]) && $_GET["user_id"] != "" && isset($_GET["type"]) && $_GET["type"] == "coach") {
+if (isset($_GET["user_id"]) && "" != $_GET["user_id"] && isset($_GET["type"]) && "coach" == $_GET["type"]) {
     $interbreadcrumb[] = ["url" => "coaches.php", "name" => get_lang('Coaches')];
 }
 
@@ -106,7 +104,7 @@ function get_users($from, $limit, $column, $direction)
         }
     }
 
-    if ($drhLoaded === false) {
+    if (false === $drhLoaded) {
         $students = UserManager::getUsersFollowedByUser(
             api_get_user_id(),
             $status,
@@ -179,7 +177,7 @@ function get_users($from, $limit, $column, $direction)
         $row[] = $first_date;
         $row[] = $string_date;
 
-        if (isset($_GET['id_coach']) && intval($_GET['id_coach']) != 0) {
+        if (isset($_GET['id_coach']) && 0 != intval($_GET['id_coach'])) {
             $detailsLink = '<a href="myStudents.php?student='.$student_id.'&id_coach='.$coach_id.'&id_session='.$sessionId.'">
 				            '.Display::return_icon('2rightarrow.png', get_lang('Details')).'</a>';
         } else {
diff --git a/public/main/mySpace/works_in_session_report.php b/public/main/mySpace/works_in_session_report.php
index 261d594bec..0b293fd0a9 100644
--- a/public/main/mySpace/works_in_session_report.php
+++ b/public/main/mySpace/works_in_session_report.php
@@ -7,8 +7,6 @@ use Chamilo\UserBundle\Entity\User;
 
 /**
  * Courses reporting.
- *
- * @package chamilo.reporting
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/notebook/index.php b/public/main/notebook/index.php
index c8b2cf78d3..1ea2002348 100644
--- a/public/main/notebook/index.php
+++ b/public/main/notebook/index.php
@@ -4,8 +4,6 @@
 use ChamiloSession as Session;
 
 /**
- * @package chamilo.notebook
- *
  * @author Christian Fasanando, initial version
  * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University, Belgium,
  * refactoring and tighter integration
@@ -49,14 +47,14 @@ $logInfo = [
 Event::registerLog($logInfo);
 
 // Tool name
-if ($action === 'addnote') {
+if ('addnote' === $action) {
     $tool = 'Add new note in my personal notebook';
     $interbreadcrumb[] = [
         'url' => 'index.php?'.api_get_cidreq(),
         'name' => get_lang('Notebook'),
     ];
 }
-if ($action === 'editnote') {
+if ('editnote' === $action) {
     $tool = 'Edit my personal note';
     $interbreadcrumb[] = [
         'url' => 'index.php?'.api_get_cidreq(),
@@ -71,8 +69,8 @@ Display::display_header(get_lang(ucfirst($tool)));
 Display::display_introduction_section(TOOL_NOTEBOOK);
 
 // Action handling: Adding a note
-if ($action === 'addnote') {
-    if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+if ('addnote' === $action) {
+    if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
         api_not_allowed();
     }
 
@@ -130,7 +128,7 @@ if ($action === 'addnote') {
         $form->setConstants(['sec_token' => $token]);
         $form->display();
     }
-} elseif ($action === 'editnote' && is_numeric($_GET['notebook_id'])) {
+} elseif ('editnote' === $action && is_numeric($_GET['notebook_id'])) {
     // Action handling: Editing a note
 
     if (!empty($_GET['isStudentView'])) {
@@ -193,7 +191,7 @@ if ($action === 'addnote') {
         $form->setConstants(['sec_token' => $token]);
         $form->display();
     }
-} elseif ($action === 'deletenote' && is_numeric($_GET['notebook_id'])) {
+} elseif ('deletenote' === $action && is_numeric($_GET['notebook_id'])) {
     // Action handling: deleting a note
     $res = NotebookManager::delete_note($_GET['notebook_id']);
     if ($res) {
@@ -201,13 +199,13 @@ if ($action === 'addnote') {
     }
 
     NotebookManager::display_notes();
-} elseif ($action === 'changeview' &&
+} elseif ('changeview' === $action &&
     in_array($_GET['view'], ['creation_date', 'update_date', 'title'])
 ) {
     // Action handling: changing the view (sorting order)
     switch ($_GET['view']) {
         case 'creation_date':
-            if (!$_GET['direction'] || $_GET['direction'] == 'ASC') {
+            if (!$_GET['direction'] || 'ASC' == $_GET['direction']) {
                 echo Display::return_message(
                     get_lang('Notes sorted by creation date ascendant'),
                     'confirmation'
@@ -220,7 +218,7 @@ if ($action === 'addnote') {
             }
             break;
         case 'update_date':
-            if (!$_GET['direction'] || $_GET['direction'] == 'ASC') {
+            if (!$_GET['direction'] || 'ASC' == $_GET['direction']) {
                 echo Display::return_message(
                     get_lang('Notes sorted by update date ascendant'),
                     'confirmation'
@@ -233,7 +231,7 @@ if ($action === 'addnote') {
             }
             break;
         case 'title':
-            if (!$_GET['direction'] || $_GET['direction'] == 'ASC') {
+            if (!$_GET['direction'] || 'ASC' == $_GET['direction']) {
                 echo Display::return_message(
                     get_lang('Notes sorted by title ascendant'),
                     'confirmation'
diff --git a/public/main/permissions/all_permissions.inc.php b/public/main/permissions/all_permissions.inc.php
index 546c3de8eb..f0af240c43 100644
--- a/public/main/permissions/all_permissions.inc.php
+++ b/public/main/permissions/all_permissions.inc.php
@@ -5,8 +5,6 @@
 * a user, group or role.
 *
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University
-*
-* @package chamilo.permissions
 */
 // possible permissions
 $rights_full = ["View", "Add", "Edit", "Delete", "Visibility", "Move"];
diff --git a/public/main/permissions/blog_permissions.inc.php b/public/main/permissions/blog_permissions.inc.php
index 990fb03390..fe2020da02 100644
--- a/public/main/permissions/blog_permissions.inc.php
+++ b/public/main/permissions/blog_permissions.inc.php
@@ -4,8 +4,6 @@
  * in a course.
  *
  * @author Toon Keppens
- *
- * @package chamilo.permissions
  */
 /**
  * Init.
@@ -54,14 +52,14 @@ while ($user = Database::fetch_assoc($result)) {
 }
 
 //$user_id=$userIdViewed;
-if (isset($mainUserInfo) && isset($mainUserInfo['status']) && $mainUserInfo['status'] == 1) {
+if (isset($mainUserInfo) && isset($mainUserInfo['status']) && 1 == $mainUserInfo['status']) {
     $course_admin = 1;
 }
 
 include_once 'permissions_functions.inc.php';
 // 			ACTIONS
 if (isset($_GET['do'])) {
-    if (isset($_GET['permission']) and isset($_GET['tool']) and ($_GET['do'] == 'grant' or $_GET['do'] == 'revoke')) {
+    if (isset($_GET['permission']) and isset($_GET['tool']) and ('grant' == $_GET['do'] or 'revoke' == $_GET['do'])) {
         $result_message = store_one_permission(
             'user',
             $_GET['do'],
@@ -70,7 +68,7 @@ if (isset($_GET['do'])) {
             $_GET['permission']
         );
     }
-    if (isset($_GET['role']) and ($_GET['do'] == 'grant' or $_GET['do'] == 'revoke')) {
+    if (isset($_GET['role']) and ('grant' == $_GET['do'] or 'revoke' == $_GET['do'])) {
         $result_message = assign_role(
             'user',
             $_GET['do'],
@@ -84,7 +82,7 @@ if (isset($_GET['do'])) {
 // ------------------------------------------------------------------
 // 			RETRIEVING THE PERMISSIONS OF THE ROLES OF THE USER
 // ------------------------------------------------------------------
-if (api_get_setting('user_roles') == 'true') {
+if ('true' == api_get_setting('user_roles')) {
     // course roles that are assigned to the user
     $current_user_role_permissions_of_user = get_roles_permissions('user', $user_id);
     $inherited_permissions = permission_array_merge($inherited_permissions, $current_user_role_permissions_of_user);
@@ -103,7 +101,7 @@ if (api_get_setting('user_roles') == 'true') {
 // ------------------------------------------------------------------
 //	RETRIEVING THE PERMISSIONS OF THE ROLES OF THE GROUPS OF THE USER
 // ------------------------------------------------------------------
-if (api_get_setting('group_roles') == 'true') {
+if ('true' == api_get_setting('group_roles')) {
     // NOTE: DIT MOET NOG VERDER UITGEWERKT WORDEN
     foreach ($groups_of_user as $group) {
         $this_current_group_role_permissions_of_user = get_roles_permissions('user', $user_id);
@@ -117,7 +115,7 @@ echo "<form method=\"post\" action=\"".str_replace('&', '&amp;', $_SERVER['REQUE
 // 		DISPLAYING THE ROLES LIST
 // ---------------------------------------------------
 
-if (api_get_setting('user_roles') == 'true') {
+if ('true' == api_get_setting('user_roles')) {
     // the list of the roles for the user
     echo '<strong>'.get_lang('User roles').'</strong><br />';
     $current_user_course_roles = get_roles('user', $user_id);
diff --git a/public/main/permissions/group_permissions.inc.php b/public/main/permissions/group_permissions.inc.php
index d0d197ec46..093d715e4d 100644
--- a/public/main/permissions/group_permissions.inc.php
+++ b/public/main/permissions/group_permissions.inc.php
@@ -1,24 +1,22 @@
 <?php
-/**
- * @package chamilo.permissions
- */
+
 include_once 'permissions_functions.inc.php';
 include_once 'all_permissions.inc.php';
 $group_id = api_get_group_id();
 
 echo $group_id;
 // 			ACTIONS
-if ($_POST['StoreGroupPermissions'] and $setting_visualisation == 'checkbox') {
+if ($_POST['StoreGroupPermissions'] and 'checkbox' == $setting_visualisation) {
     $result_message = store_permissions('group', $group_id);
     if ($result_message) {
         echo Display::return_message($result_message);
     }
 }
 if (isset($_GET['action'])) {
-    if (($_GET['action'] == 'grant' or $_GET['action'] == 'revoke') and isset($_GET['permission']) and isset($_GET['tool'])) {
+    if (('grant' == $_GET['action'] or 'revoke' == $_GET['action']) and isset($_GET['permission']) and isset($_GET['tool'])) {
         $result_message = store_one_permission('group', $_GET['action'], $group_id, $_GET['tool'], $_GET['permission']);
     }
-    if (isset($_GET['role']) and ($_GET['action'] == 'grant' or $_GET['action'] == 'revoke')) {
+    if (isset($_GET['role']) and ('grant' == $_GET['action'] or 'revoke' == $_GET['action'])) {
         $result_message = assign_role('group', $_GET['action'], $group_id, $_GET['role'], $_GET['scope']);
         echo 'hier';
     }
@@ -40,16 +38,16 @@ $inherited_permissions = permission_array_merge($group_course_roles_permissions,
 // 			LIMITED OR FULL
 $current_group_permissions = limited_or_full($current_group_permissions);
 $inherited_permissions = limited_or_full($inherited_permissions);
-if (api_get_setting('permissions') == 'limited') {
+if ('limited' == api_get_setting('permissions')) {
     $header_array = $rights_limited;
 }
-if (api_get_setting('permissions') == 'full') {
+if ('full' == api_get_setting('permissions')) {
     $header_array = $rights_full;
 }
 
 echo "<form method=\"post\" action=\"".str_replace('&', '&amp;', $_SERVER['REQUEST_URI'])."\">";
 // 		DISPLAYING THE ROLES LIST
-if (api_get_setting('group_roles') == 'true') {
+if ('true' == api_get_setting('group_roles')) {
     // the list of the roles for the user
     echo '<strong>'.get_lang('Group roles').'</strong><br />';
     $current_group_course_roles = get_roles('group', $group_id);
@@ -79,7 +77,7 @@ foreach ($tool_rights as $tool => $rights) { // $tool_rights contains all the po
     foreach ($header_array as $key => $value) {
         echo "\t\t<td align='center'>\n";
         if (in_array($value, $rights)) {
-            if ($setting_visualisation == 'checkbox') {
+            if ('checkbox' == $setting_visualisation) {
                 //display_checkbox_matrix($current_group_permissions, $tool, $value);
                 display_checkbox_matrix(
                     $current_group_permissions,
@@ -89,7 +87,7 @@ foreach ($tool_rights as $tool => $rights) { // $tool_rights contains all the po
                     $course_admin
                 );
             }
-            if ($setting_visualisation == 'image') {
+            if ('image' == $setting_visualisation) {
                 //display_image_matrix($current_group_permissions, $tool, $value);
                 display_image_matrix(
                     $current_group_permissions,
@@ -110,7 +108,7 @@ foreach ($tool_rights as $tool => $rights) { // $tool_rights contains all the po
 }
 
 echo "</table>\n";
-if ($setting_visualisation == 'checkbox') {
+if ('checkbox' == $setting_visualisation) {
     echo "<input type=\"Submit\" name=\"StoreGroupPermissions\" value=\"".get_lang('Store permissions')."\">";
 }
 echo "</form>";
diff --git a/public/main/permissions/permissions_functions.inc.php b/public/main/permissions/permissions_functions.inc.php
index 8137101a97..2dd6c893a0 100644
--- a/public/main/permissions/permissions_functions.inc.php
+++ b/public/main/permissions/permissions_functions.inc.php
@@ -9,8 +9,6 @@
  *    limited_or_full($current_permissions)
  *
  * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University
- *
- * @package chamilo.permissions
  */
 
 /**
@@ -31,15 +29,15 @@ function store_permissions($content, $id)
     $course_id = api_get_course_int_id();
 
     // Which database are we using (depending on the $content parameter)
-    if ($content == 'user') {
+    if ('user' == $content) {
         $table = Database::get_course_table(TABLE_PERMISSION_USER);
         $id_field = user_id;
     }
-    if ($content == 'group') {
+    if ('group' == $content) {
         $table = Database::get_course_table(TABLE_PERMISSION_GROUP);
         $id_field = group_id;
     }
-    if ($content == 'role') {
+    if ('role' == $content) {
         $table = Database::get_course_table(TABLE_ROLE_PERMISSION);
         $id_field = role_id;
     }
@@ -87,28 +85,28 @@ function store_one_permission($content, $action, $id, $tool, $permission)
 
     // Which database are we using (depending on the $content parameter)
 
-    if ($content == 'user') {
+    if ('user' == $content) {
         $table = Database::get_course_table(TABLE_PERMISSION_USER);
         $id_field = user_id;
     }
-    if ($content == 'group') {
+    if ('group' == $content) {
         $table = Database::get_course_table(TABLE_PERMISSION_GROUP);
         $id_field = group_id;
     }
-    if ($content == 'role') {
+    if ('role' == $content) {
         $table = Database::get_course_table(TABLE_ROLE_PERMISSION);
         $id_field = role_id;
     }
 
     // grating a right
-    if ($action == 'grant') {
+    if ('grant' == $action) {
         $sql = "INSERT INTO $table (c_id, $id_field,tool,action) VALUES ($course_id, '".Database::escape_string($id)."','".Database::escape_string($tool)."','".Database::escape_string($permission)."')";
         $result = Database::query($sql);
         if ($result) {
             $result_message = get_lang('PermissionGranted');
         }
     }
-    if ($action == 'revoke') {
+    if ('revoke' == $action) {
         $sql = "DELETE FROM $table WHERE c_id = $course_id AND $id_field = '".Database::escape_string($id)."' AND tool='".Database::escape_string($tool)."' AND action='".Database::escape_string($permission)."'";
         $result = Database::query($sql);
         if ($result) {
@@ -135,20 +133,20 @@ function get_permissions($content, $id)
     $currentpermissions = [];
     // Which database are we using (depending on the $content parameter)
     $course_id_condition = " c_id = $course_id AND ";
-    if ($content == 'user') {
+    if ('user' == $content) {
         $table = Database::get_course_table(TABLE_PERMISSION_USER);
         $id_field = 'user_id';
-    } elseif ($content == 'group') {
+    } elseif ('group' == $content) {
         $table = Database::get_course_table(TABLE_PERMISSION_GROUP);
         $id_field = 'group_id';
-    } elseif ($content == 'role') {
+    } elseif ('role' == $content) {
         $table = Database::get_course_table(TABLE_ROLE_PERMISSION);
         $id_field = 'role_id';
-    } elseif ($content == 'platform_role') {
+    } elseif ('platform_role' == $content) {
         $table = Database::get_main_table(TABLE_ROLE_PERMISSION);
         $id_field = 'role_id';
         $course_id_condition = '';
-    } elseif ($content == 'task') {
+    } elseif ('task' == $content) {
         $table = Database::get_course_table(TABLE_BLOGS_TASKS_PERMISSIONS);
         $id_field = 'task_id';
     }
@@ -182,15 +180,15 @@ function get_permissions($content, $id)
  */
 function limited_or_full($current_permissions)
 {
-    if (api_get_setting('permissions') == 'limited') {
+    if ('limited' == api_get_setting('permissions')) {
         foreach ($current_permissions as $tool => $tool_rights) {
             // we loop through the possible permissions of a tool and unset the entry if it is view
             // if it is visibility or move we have to grant the edit right
             foreach ($tool_rights as $key => $value) {
-                if ($value == 'View') {
+                if ('View' == $value) {
                     unset($current_permissions[$tool][$key]);
                 }
-                if ($value == 'Visibility' or $value == 'Move') {
+                if ('Visibility' == $value or 'Move' == $value) {
                     if (!in_array('Edit', $current_permissions[$tool])) {
                         $current_permissions[$tool][] = 'Edit';
                     }
@@ -205,7 +203,7 @@ function limited_or_full($current_permissions)
 
         return $current_permissions;
     }
-    if (api_get_setting('permissions') == 'full') {
+    if ('full' == api_get_setting('permissions')) {
         return $current_permissions;
     }
 }
@@ -401,10 +399,10 @@ function display_role_list($current_course_roles, $current_platform_roles)
             $image = 'wrong.gif';
             $action = 'grant';
         }
-        if ($setting_visualisation == 'checkbox') {
+        if ('checkbox' == $setting_visualisation) {
             echo "<input type=\"checkbox\" name=\"role*course*".$row['role_id']."\" $checked>";
         }
-        if ($setting_visualisation == 'image') {
+        if ('image' == $setting_visualisation) {
             echo "<a href=\"".str_replace('&', '&amp;', $_SERVER['REQUEST_URI'])."&amp;action=$action&amp;role=".$row['role_id']."&amp;scope=course\"><img src=\"../img/".$image."\" border=\"0\"/></a>";
         }
 
@@ -430,11 +428,11 @@ function display_role_list($current_course_roles, $current_platform_roles)
 function get_roles($content, $id, $scope = 'course')
 {
     $course_id = api_get_course_int_id();
-    if ($content == 'user') {
+    if ('user' == $content) {
         $table = Database::get_course_table(TABLE_ROLE_USER);
         $id_field = user_id;
     }
-    if ($content == 'group') {
+    if ('group' == $content) {
         $table = Database::get_course_table(TABLE_ROLE_GROUP);
         $id_field = 'group_id';
     }
@@ -465,10 +463,10 @@ function get_all_roles($content = 'course')
     $course_id = api_get_course_int_id();
     $course_id_condition = " WHERE c_id = $course_id ";
 
-    if ($content == 'course') {
+    if ('course' == $content) {
         $table_role = Database::get_course_table(TABLE_ROLE);
     }
-    if ($content == 'platform') {
+    if ('platform' == $content) {
         $table_role = Database::get_main_table(TABLE_ROLE);
         $course_id_condition = '';
     }
@@ -501,26 +499,26 @@ function get_all_roles($content = 'course')
 function get_roles_permissions($content, $id, $scope = 'course')
 {
     $course_id = api_get_course_int_id();
-    if ($content == 'user') {
+    if ('user' == $content) {
         $table = Database::get_course_table(TABLE_ROLE_USER);
         $id_field = 'user_id';
     }
 
-    if ($content == 'group') {
+    if ('group' == $content) {
         $table = Database::get_course_table(TABLE_ROLE_GROUP);
         $id_field = 'group_id';
     }
 
     // course roles or platform roles
     $scope = 'course';
-    if ($scope == 'course') {
+    if ('course' == $scope) {
         $table_role = Database::get_course_table(TABLE_ROLE);
         $table_role_permissions = Database::get_course_table(TABLE_ROLE_PERMISSION);
 
         $role_condition = " role.c_id = $course_id AND role_permissions.c_id = $course_id AND ";
     }
 
-    if ($scope == 'platform') {
+    if ('platform' == $scope) {
         $table_role = Database::get_main_table(TABLE_ROLE);
         $table_role_permissions = Database::get_main_table(TABLE_ROLE_PERMISSION);
         $role_condition = '';
@@ -563,10 +561,10 @@ function assign_role($content, $action, $id, $role_id, $scope = 'course')
 {
     $course_id = api_get_course_int_id();
     // Which database are we using (depending on the $content parameter)
-    if ($content == 'user') {
+    if ('user' == $content) {
         $table = Database::get_course_table(TABLE_ROLE_USER);
         $id_field = 'user_id';
-    } elseif ($content == 'group') {
+    } elseif ('group' == $content) {
         $table = Database::get_course_table(TABLE_ROLE_GROUP);
         $id_field = 'group_id';
     } else {
@@ -574,7 +572,7 @@ function assign_role($content, $action, $id, $role_id, $scope = 'course')
     }
 
     // grating a right
-    if ($action == 'grant') {
+    if ('grant' == $action) {
         $sql = "INSERT INTO $table (c_id, role_id, scope, $id_field) VALUES ($course_id, '".Database::escape_string($role_id)."','".Database::escape_string($scope)."','".Database::escape_string($id)."')";
         $result = Database::query($sql);
         if ($result) {
@@ -582,7 +580,7 @@ function assign_role($content, $action, $id, $role_id, $scope = 'course')
         }
     }
 
-    if ($action == 'revoke') {
+    if ('revoke' == $action) {
         $sql = "DELETE FROM $table WHERE c_id = $course_id AND $id_field = '".Database::escape_string($id)."' AND role_id='".Database::escape_string($role_id)."'";
         $result = Database::query($sql);
         if ($result) {
diff --git a/public/main/permissions/roles.php b/public/main/permissions/roles.php
index 168c46e8fd..6a0dcdf037 100644
--- a/public/main/permissions/roles.php
+++ b/public/main/permissions/roles.php
@@ -1,7 +1,5 @@
 <?php
-/**
- * @package chamilo.permissions
- */
+
 require '../inc/global.inc.php';
 require_once 'permissions_functions.inc.php';
 require_once 'all_permissions.inc.php';
@@ -26,13 +24,13 @@ if ($_POST['StoreRolePermissions']) {
 }
 // storing a permission for a given role when the image approach is used
 if (isset($_GET['action']) and isset($_GET['permission']) and isset($_GET['tool'])) {
-    if ($_GET['action'] == 'grant' or $_GET['action'] == 'revoke') {
+    if ('grant' == $_GET['action'] or 'revoke' == $_GET['action']) {
         $result_message = store_one_permission('role', $_GET['action'], $role_id, $_GET['tool'], $_GET['permission']);
     }
 }
 
 // deleting a role
-if (isset($_GET['action']) and isset($_GET['role_id']) and $_GET['action'] == 'delete') {
+if (isset($_GET['action']) and isset($_GET['role_id']) and 'delete' == $_GET['action']) {
     //deleting the assignments fo this role: users
     $table = Database::get_course_table(TABLE_ROLE_USER);
     $sql = "DELETE FROM $table WHERE role_id='".intval($_GET['role_id'])."'";
@@ -63,7 +61,7 @@ if (isset($result_message)) {
 // 		ADDING A NEW ROLE (FORM AND LINK)
 echo '<img src="../img/add.png" /> <a href="roles.php?action=add">'.get_lang('AddRole').'</a>';
 
-if ($_GET['action'] == 'add') {
+if ('add' == $_GET['action']) {
     echo "<form method=\"post\" action=\"".api_get_self()."\">";
     echo "\n<table>";
     echo "\n\t<tr>";
@@ -94,10 +92,10 @@ if ($_GET['action'] == 'add') {
     echo "<table class=\"data_table\">\n";
 
     // the header
-    if (api_get_setting('permissions') == 'limited') {
+    if ('limited' == api_get_setting('permissions')) {
         $header_array = $rights_limited;
     }
-    if (api_get_setting('permissions') == 'full') {
+    if ('full' == api_get_setting('permissions')) {
         $header_array = $rights_full;
     }
     echo "\t<tr>\n";
@@ -152,10 +150,10 @@ if ($_GET['role_id']) {
     $current_role_permissions = get_permissions('role', $_GET['role_id']);
     // 			LIMITED OR FULL
     $current_role_permissions = limited_or_full($current_role_permissions);
-    if (api_get_setting('permissions') == 'limited') {
+    if ('limited' == api_get_setting('permissions')) {
         $header_array = $rights_limited;
     }
-    if (api_get_setting('permissions') == 'full') {
+    if ('full' == api_get_setting('permissions')) {
         $header_array = $rights_full;
     }
     // ---------------------------------------------------
@@ -165,7 +163,7 @@ if ($_GET['role_id']) {
 
     // the list of the roles for the user
     echo get_lang('PermissionsOfRole').':'.$current_role_info['role_name'].'<br />';
-    if ($_GET['scope'] == 'platform') {
+    if ('platform' == $_GET['scope']) {
         echo get_lang('IsPlatformRoleNotEditable').'<br />';
     }
 
@@ -189,15 +187,15 @@ if ($_GET['role_id']) {
         foreach ($header_array as $key => $value) {
             echo "\t\t<td align='center'>\n";
             if (in_array($value, $rights)) {
-                if ($setting_visualisation == 'checkbox') {
+                if ('checkbox' == $setting_visualisation) {
                     display_checkbox_matrix(
                         $current_role_permissions,
                         $tool,
                         $value
                     );
                 }
-                if ($setting_visualisation == 'image') {
-                    if ($_GET['scope'] == 'platform') {
+                if ('image' == $setting_visualisation) {
+                    if ('platform' == $_GET['scope']) {
                         $roles_editable = false;
                     } else {
                         $roles_editable = true;
@@ -218,7 +216,7 @@ if ($_GET['role_id']) {
     }
 
     echo "</table>\n";
-    if ($setting_visualisation == 'checkbox') {
+    if ('checkbox' == $setting_visualisation) {
         echo "<input type=\"Submit\" name=\"StoreRolePermissions\" value=\"".get_lang('Store permissions')."\">";
     }
     echo "</form>";
diff --git a/public/main/permissions/user_permissions.inc.php b/public/main/permissions/user_permissions.inc.php
index eb67fc5b1e..16a075efc6 100644
--- a/public/main/permissions/user_permissions.inc.php
+++ b/public/main/permissions/user_permissions.inc.php
@@ -1,9 +1,7 @@
 <?php
-/**
- * @package chamilo.permissions
- */
+
 $user_id = $userIdViewed;
-if ($mainUserInfo['status'] == 1) {
+if (1 == $mainUserInfo['status']) {
     $course_admin = 1;
 }
 include_once 'permissions_functions.inc.php';
@@ -11,17 +9,17 @@ include_once 'all_permissions.inc.php';
 include_once api_get_library_path()."/groupmanager.lib.php";
 include_once api_get_library_path()."/blog.lib.php";
 // 			ACTIONS
-if ($_POST['StoreUser permissions'] and $setting_visualisation == 'checkbox') {
+if ($_POST['StoreUser permissions'] and 'checkbox' == $setting_visualisation) {
     $result_message = store_permissions('user', $user_id);
     if ($result_message) {
         echo Display::return_message($result_message);
     }
 }
 if (isset($_GET['action'])) {
-    if (isset($_GET['permission']) and isset($_GET['tool']) and ($_GET['action'] == 'grant' or $_GET['action'] == 'revoke')) {
+    if (isset($_GET['permission']) and isset($_GET['tool']) and ('grant' == $_GET['action'] or 'revoke' == $_GET['action'])) {
         $result_message = store_one_permission('user', $_GET['action'], $user_id, $_GET['tool'], $_GET['permission']);
     }
-    if (isset($_GET['role']) and ($_GET['action'] == 'grant' or $_GET['action'] == 'revoke')) {
+    if (isset($_GET['role']) and ('grant' == $_GET['action'] or 'revoke' == $_GET['action'])) {
         $result_message = assign_role('user', $_GET['action'], $user_id, $_GET['role'], $_GET['scope']);
     }
 }
@@ -52,7 +50,7 @@ foreach ($groups_of_user as $group) {
 $inherited_permissions = $inherited_group_permissions;
 
 // 			RETRIEVING THE PERMISSIONS OF THE ROLES OF THE USER
-if (api_get_setting('user_roles') == 'true') {
+if ('true' == api_get_setting('user_roles')) {
     // course roles that are assigned to the user
     $current_user_role_permissions_of_user = get_roles_permissions('user', $user_id);
     $inherited_permissions = permission_array_merge($inherited_permissions, $current_user_role_permissions_of_user);
@@ -69,7 +67,7 @@ if (api_get_setting('user_roles') == 'true') {
     $inherited_permissions = permission_array_merge($inherited_permissions, $current_user_role_permissions_of_user);
 }
 //	RETRIEVING THE PERMISSIONS OF THE ROLES OF THE GROUPS OF THE USER
-if (api_get_setting('group_roles') == 'true') {
+if ('true' == api_get_setting('group_roles')) {
     // NOTE: DIT MOET NOG VERDER UITGEWERKT WORDEN
     foreach ($groups_of_user as $group) {
         $this_current_group_role_permissions_of_user = get_roles_permissions('user', $user_id);
@@ -80,17 +78,17 @@ if (api_get_setting('group_roles') == 'true') {
 // 			LIMITED OR FULL
 $current_user_permissions = limited_or_full($current_user_permissions);
 $inherited_permissions = limited_or_full($inherited_permissions);
-if (api_get_setting('permissions') == 'limited') {
+if ('limited' == api_get_setting('permissions')) {
     $header_array = $rights_limited;
 }
-if (api_get_setting('permissions') == 'full') {
+if ('full' == api_get_setting('permissions')) {
     $header_array = $rights_full;
 }
 
 echo "<form method=\"post\" action=\"".str_replace('&', '&amp;', $_SERVER['REQUEST_URI'])."\">";
 // 		DISPLAYING THE ROLES LIST
 
-if (api_get_setting('user_roles') == 'true') {
+if ('true' == api_get_setting('user_roles')) {
     // the list of the roles for the user
     echo '<strong>'.get_lang('User roles').'</strong><br />';
     $current_user_course_roles = get_roles('user', $user_id);
@@ -134,7 +132,7 @@ foreach ($tool_rights as $tool => $rights) {
     foreach ($header_array as $key => $value) {
         echo "\t\t<td align='center'>\n";
         if (in_array($value, $rights)) {
-            if ($setting_visualisation == 'checkbox') {
+            if ('checkbox' == $setting_visualisation) {
                 display_checkbox_matrix(
                     $current_user_permissions,
                     $tool,
@@ -143,7 +141,7 @@ foreach ($tool_rights as $tool => $rights) {
                     $course_admin
                 );
             }
-            if ($setting_visualisation == 'image') {
+            if ('image' == $setting_visualisation) {
                 display_image_matrix(
                     $current_user_permissions,
                     $tool,
@@ -163,7 +161,7 @@ foreach ($tool_rights as $tool => $rights) {
 }
 
 echo "</table>\n";
-if ($setting_visualisation == 'checkbox') {
+if ('checkbox' == $setting_visualisation) {
     echo "<input type=\"Submit\" name=\"StoreUser permissions\" value=\"".get_lang('Store permissions')."\">";
 }
 echo "</form><br />";
diff --git a/public/main/plagiarism/compilatio/download.php b/public/main/plagiarism/compilatio/download.php
index 2c62ba6bda..d95e350fa0 100644
--- a/public/main/plagiarism/compilatio/download.php
+++ b/public/main/plagiarism/compilatio/download.php
@@ -8,8 +8,6 @@ exit;
  *	Html files are parsed to fix a few problems with URLs,
  *	but this code will hopefully be replaced soon by an Apache URL
  *	rewrite mechanism.
- *
- *	@package chamilo.work
  */
 session_cache_limiter('public');
 require_once '../../inc/global.inc.php';
@@ -45,7 +43,7 @@ if (!empty($courseInfo['real_id'])) {
         if (empty($item_info)) {
             exit;
         }
-        if ($courseInfo['show_score'] == 0 || $item_info['visibility'] == 1 && $row['accepted'] == 1 &&
+        if (0 == $courseInfo['show_score'] || 1 == $item_info['visibility'] && 1 == $row['accepted'] &&
             ($row['user_id'] == api_get_user_id() || api_is_allowed_to_edit())
         ) {
             $title = str_replace(' ', '_', $row['title']);
diff --git a/public/main/plagiarism/compilatio/upload.php b/public/main/plagiarism/compilatio/upload.php
index 371a5401a9..fb95f8c3db 100644
--- a/public/main/plagiarism/compilatio/upload.php
+++ b/public/main/plagiarism/compilatio/upload.php
@@ -14,7 +14,7 @@ $courseInfo = api_get_course_info();
 $compilatio = new Compilatio();
 
 /* if we have to upload severals documents*/
-if (isset($_REQUEST['type']) && $_REQUEST['type'] === 'multi') {
+if (isset($_REQUEST['type']) && 'multi' === $_REQUEST['type']) {
     $docs = explode('a', $_REQUEST['doc']);
     for ($k = 0; $k < count($docs) - 1; $k++) {
         $documentId = 0;
@@ -41,7 +41,7 @@ if (isset($_REQUEST['type']) && $_REQUEST['type'] === 'multi') {
                 $WrkUrl = $currentCourseRepositoryWeb.$doc->url;
                 $LocalWrkUrl = $courseInfo['course_sys_path'].$doc->url;
                 $mime = DocumentManager::file_get_mime_type($doc->title);
-                if ($compilatio->getTransportMode() === 'wget') {
+                if ('wget' === $compilatio->getTransportMode()) {
                     /*Compilatio's server recover tjre file throught wget like this:
                     username:password@http://somedomain.com/reg/remotefilename.tar.gz */
                     if (strlen($compilatio->getWgetUri()) > 2) {
@@ -102,7 +102,7 @@ function sendDocument($documentId, $courseInfo)
     $mime = DocumentManager::file_get_mime_type($doc->title);
 
     $compilatio = new Compilatio();
-    if ($compilatio->getTransportMode() === 'wget') {
+    if ('wget' === $compilatio->getTransportMode()) {
         if (strlen($compilatio->getWgetUri()) > 2) {
             $filename = preg_replace('/$', '', $compilatio->getWgetUri()).'/'.$courseInfo['path'].'/'.$doc->title;
         } else {
@@ -220,7 +220,7 @@ function compilatioUpdateWorkDocument($docId, $courseId)
     $coursePath = $_course['course_sys_path'];
     $workTitle = getWorkTitle($docId, $courseId);
 
-    if ($extensionFile != '' && $urlFile_ext == '') {
+    if ('' != $extensionFile && '' == $urlFile_ext) {
         /* Rename the files in the FS whit the extension*/
         $shortFilename = $filename;
         $cleanWorkTitle = api_replace_dangerous_char($workTitle);
diff --git a/public/main/portfolio/index.php b/public/main/portfolio/index.php
index 88259536c0..e482e06190 100644
--- a/public/main/portfolio/index.php
+++ b/public/main/portfolio/index.php
@@ -56,7 +56,7 @@ $isValid = function ($item) use ($user, $course, $session) {
         return false;
     }
 
-    if (get_class($item) == Portfolio::class) {
+    if (Portfolio::class == get_class($item)) {
         if ($session && $item->getSession()->getId() != $session->getId()) {
             return false;
         }
diff --git a/public/main/search/index.php b/public/main/search/index.php
index e281d2f54c..9de8c8eb66 100644
--- a/public/main/search/index.php
+++ b/public/main/search/index.php
@@ -3,8 +3,6 @@
 /**
  * This file includes lp_list_search to avoid duplication of code, it
  * bootstraps chamilo api enough to make lp_list_search work.
- *
- * @package chamilo.search
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $this_section = SECTION_COURSES;
diff --git a/public/main/search/search_suggestions.php b/public/main/search/search_suggestions.php
index 72c66f0d50..c2fb0edb1d 100644
--- a/public/main/search/search_suggestions.php
+++ b/public/main/search/search_suggestions.php
@@ -3,8 +3,6 @@
 
 /**
  * Suggest words to search.
- *
- * @package chamilo.search
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -17,7 +15,7 @@ function get_suggestions_from_search_engine($q)
     $q = Database::escape_string($q);
     $cid = api_get_course_id();
     $sql_add = '';
-    if ($cid != -1) {
+    if (-1 != $cid) {
         $sql_add = " AND course_code = '".$cid."' ";
     }
     $sql = "SELECT * FROM $table_sfv where value LIKE '%$q%'".$sql_add."
@@ -83,7 +81,7 @@ function get_suggestions_from_search_engine($q)
                     } else {
                         //no identical field id, continue as usual
                         $c = count($output);
-                        if ($c == 0) {
+                        if (0 == $c) {
                             $output[] = $row2['value'].' - ';
                         } else {
                             foreach ($output as $i => $out) {
@@ -95,7 +93,7 @@ function get_suggestions_from_search_engine($q)
                     }
                 }
                 foreach ($output as $i => $out) {
-                    if (api_stristr($out, $q) === false) {
+                    if (false === api_stristr($out, $q)) {
                         continue;
                     }
                     $s = api_convert_encoding(substr($out, 0, -3), 'UTF-8', $charset);
diff --git a/public/main/session/add_courses_to_session.php b/public/main/session/add_courses_to_session.php
index 1443e4535d..0e386a76d6 100644
--- a/public/main/session/add_courses_to_session.php
+++ b/public/main/session/add_courses_to_session.php
@@ -40,7 +40,7 @@ $tbl_course = Database::get_main_table(TABLE_MAIN_COURSE);
 $tool_name = get_lang('Add courses to this session');
 
 $add_type = 'multiple';
-if (isset($_GET['add_type']) && $_GET['add_type'] != '') {
+if (isset($_GET['add_type']) && '' != $_GET['add_type']) {
     $add_type = Security::remove_XSS($_REQUEST['add_type']);
 }
 
@@ -107,7 +107,7 @@ if (isset($_POST['formSent']) && $_POST['formSent'] && isset($_POST['SessionCour
 // Display the header
 Display::display_header($tool_name);
 
-if ($add_type === 'multiple') {
+if ('multiple' === $add_type) {
     $link_add_type_unique = '<a href="'.api_get_self().'?id_session='.$sessionId.'&add='.$add.'&add_type=unique">'.
         Display::return_icon('single.gif').get_lang('Single registration').'</a>';
     $link_add_type_multiple = Display::return_icon('multiple.gif').get_lang('Multiple registration').' ';
@@ -123,7 +123,7 @@ echo '<div class="actions">';
 echo $link_add_type_unique.$link_add_type_multiple;
 echo '</div>';
 
-$ajax_search = $add_type === 'unique' ? true : false;
+$ajax_search = 'unique' === $add_type ? true : false;
 $nosessionCourses = $sessionCourses = [];
 if ($ajax_search) {
     $sql = "SELECT course.id, code, title, visual_code, session_id
@@ -137,7 +137,7 @@ if ($ajax_search) {
     if (api_is_multiple_url_enabled()) {
         $tbl_course_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             $sql = "SELECT course.id, code, title, visual_code, session_id
                     FROM $tbl_course course
                     INNER JOIN $tbl_session_rel_course session_rel_course
@@ -166,7 +166,7 @@ if ($ajax_search) {
     if (api_is_multiple_url_enabled()) {
         $tbl_course_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             $sql = "SELECT course.id, code, title, visual_code, session_id
                     FROM $tbl_course course
                     LEFT JOIN $tbl_session_rel_course session_rel_course
@@ -219,7 +219,7 @@ unset($Courses);
         <div class="col-md-4">
             <label><?php echo get_lang('Courses list'); ?> :</label>
             <?php
-            if (!($add_type == 'multiple')) {
+            if (!('multiple' == $add_type)) {
                 ?>
                 <input type="text" id="course_to_add" onkeyup="xajax_search_courses(this.value, 'single', <?php echo $sessionId; ?>)" class="form-control"/>
                 <div id="ajax_list_courses_single"></div>
@@ -246,7 +246,7 @@ unset($Courses);
             ?>
         </div>
         <div class="col-md-4">
-            <?php if ($add_type == 'multiple') {
+            <?php if ('multiple' == $add_type) {
                 ?>
                 <div class="code-course">
                     <?php echo get_lang('First letter (code)'); ?> :
diff --git a/public/main/session/add_edit_users_to_session.php b/public/main/session/add_edit_users_to_session.php
index cc81211192..37c3e2d5eb 100644
--- a/public/main/session/add_edit_users_to_session.php
+++ b/public/main/session/add_edit_users_to_session.php
@@ -36,7 +36,7 @@ $tbl_session_rel_user = Database::get_main_table(TABLE_MAIN_SESSION_USER);
 // setting the name of the tool
 $tool_name = get_lang('Subscribe users to this session');
 $add_type = 'unique';
-if (isset($_REQUEST['add_type']) && $_REQUEST['add_type'] != '') {
+if (isset($_REQUEST['add_type']) && '' != $_REQUEST['add_type']) {
     $add_type = Security::remove_XSS($_REQUEST['add_type']);
 }
 
@@ -50,7 +50,7 @@ $new_field_list = [];
 if (is_array($extra_field_list)) {
     foreach ($extra_field_list as $extra_field) {
         //if is enabled to filter and is a "<select>" field type
-        if ($extra_field[8] == 1 && $extra_field[2] == ExtraField::FIELD_TYPE_SELECT) {
+        if (1 == $extra_field[8] && ExtraField::FIELD_TYPE_SELECT == $extra_field[2]) {
             $new_field_list[] = [
                 'name' => $extra_field[3],
                 'type' => $extra_field[2],
@@ -58,7 +58,7 @@ if (is_array($extra_field_list)) {
                 'data' => $extra_field[9],
             ];
         }
-        if ($extra_field[8] == 1 && $extra_field[2] == ExtraField::FIELD_TYPE_TAG) {
+        if (1 == $extra_field[8] && ExtraField::FIELD_TYPE_TAG == $extra_field[2]) {
             $options = UserManager::get_extra_user_data_for_tags($extra_field[1]);
             $new_field_list[] = [
                 'name' => $extra_field[3],
@@ -82,7 +82,7 @@ function search_users($needle, $type)
 
     if (!empty($needle) && !empty($type)) {
         // Normal behaviour
-        if ($type == 'any_session' && $needle == 'false') {
+        if ('any_session' == $type && 'false' == $needle) {
             $type = 'multiple';
             $needle = '';
         }
@@ -92,13 +92,13 @@ function search_users($needle, $type)
         $showOfficialCode = false;
 
         $orderListByOfficialCode = api_get_setting('order_user_list_by_official_code');
-        if ($orderListByOfficialCode === 'true') {
+        if ('true' === $orderListByOfficialCode) {
             $showOfficialCode = true;
             $order_clause = ' ORDER BY official_code, lastname, firstname, username';
         }
 
         if (api_is_session_admin()
-            && api_get_setting('prevent_session_admins_to_manage_all_users') === 'true'
+            && 'true' === api_get_setting('prevent_session_admins_to_manage_all_users')
         ) {
             $order_clause = " AND user.creator_id = ".api_get_user_id().$order_clause;
         }
@@ -171,7 +171,7 @@ function search_users($needle, $type)
         if (api_is_multiple_url_enabled()) {
             $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 switch ($type) {
                     case 'single':
                         $sql = "
@@ -226,7 +226,7 @@ function search_users($needle, $type)
 
         $rs = Database::query($sql);
         $i = 0;
-        if ($type == 'single') {
+        if ('single' == $type) {
             while ($user = Database:: fetch_array($rs)) {
                 $i++;
                 if ($i <= 10) {
@@ -325,7 +325,7 @@ if (isset($_POST['form_sent']) && $_POST['form_sent']) {
         $UserList = [];
     }
 
-    if ($form_sent == 1) {
+    if (1 == $form_sent) {
         $notEmptyList = api_get_configuration_value('session_multiple_subscription_students_list_avoid_emptying');
 
         // Added a parameter to send emails when registering a user
@@ -346,7 +346,7 @@ Display::display_header($tool_name);
 
 $nosessionUsersList = $sessionUsersList = [];
 $where_filter = null;
-$ajax_search = $add_type == 'unique' ? true : false;
+$ajax_search = 'unique' == $add_type ? true : false;
 
 //$order_clause = api_sort_by_first_name() ? ' ORDER BY firstname, lastname, username' : ' ORDER BY lastname, firstname, username';
 // On this screen, it doesn't make sense to order users by firstname. Always use lastname first
@@ -357,7 +357,7 @@ $order_clause = ' ORDER BY lastname, firstname, username';
 
 $showOfficialCode = false;
 $orderListByOfficialCode = api_get_setting('order_user_list_by_official_code');
-if ($orderListByOfficialCode === 'true') {
+if ('true' === $orderListByOfficialCode) {
     $showOfficialCode = true;
     $order_clause = ' ORDER BY official_code, lastname, firstname, username';
 }
@@ -378,7 +378,7 @@ if ($ajax_search) {
     if (api_is_multiple_url_enabled()) {
         $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             $sql = "
                 SELECT u.id, u.lastname, u.firstname, u.username, session_id, u.official_code
                 FROM $tbl_user u
@@ -405,7 +405,7 @@ if ($ajax_search) {
     // Filter the user list in all courses in the session
     foreach ($sessionUserInfo as $sessionUser) {
         // filter students in session
-        if ($sessionUser['status_in_session'] != 0) {
+        if (0 != $sessionUser['status_in_session']) {
             continue;
         }
 
@@ -426,9 +426,9 @@ if ($ajax_search) {
                 $varname = 'field_'.$new_field['variable'];
                 $fieldtype = $new_field['type'];
                 if (UserManager::is_extra_field_available($new_field['variable'])) {
-                    if (isset($_POST[$varname]) && $_POST[$varname] != '0') {
+                    if (isset($_POST[$varname]) && '0' != $_POST[$varname]) {
                         $use_extra_fields = true;
-                        if ($fieldtype == ExtraField::FIELD_TYPE_TAG) {
+                        if (ExtraField::FIELD_TYPE_TAG == $fieldtype) {
                             $extra_field_result[] = UserManager::get_extra_user_data_by_tags(
                                 intval($_POST['field_id']),
                                 $_POST[$varname]
@@ -476,7 +476,7 @@ if ($ajax_search) {
             }
         }
     }
-    if (api_is_session_admin() && api_get_setting('prevent_session_admins_to_manage_all_users') === 'true') {
+    if (api_is_session_admin() && 'true' === api_get_setting('prevent_session_admins_to_manage_all_users')) {
         $order_clause = " AND u.creator_id = ".api_get_user_id().$order_clause;
     }
     if ($use_extra_fields) {
@@ -507,7 +507,7 @@ if ($ajax_search) {
     if (api_is_multiple_url_enabled()) {
         $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             $sql = "
                 SELECT  u.id, lastname, firstname, username, session_id, official_code
                 FROM $tbl_user u
@@ -554,7 +554,7 @@ if ($ajax_search) {
     if (api_is_multiple_url_enabled()) {
         $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             $sql = "
                 SELECT  u.id, lastname, firstname, username, session_id, official_code
                 FROM $tbl_user u
@@ -585,7 +585,7 @@ if ($ajax_search) {
     unset($users); //clean to free memory
 }
 
-if ($add_type == 'multiple') {
+if ('multiple' == $add_type) {
     $link_add_type_unique =
         '<a href="'.api_get_self().'?id_session='.$id_session.'&add='.$addProcess.'&add_type=unique">'.
         Display::return_icon('single.gif').get_lang('Single registration').'</a>';
@@ -628,7 +628,7 @@ $newLinks .= Display::url(
         } ?>>
         <?php echo '<legend>'.$tool_name.' ('.$session_info['name'].') </legend>'; ?>
         <?php
-        if ($add_type == 'multiple') {
+        if ('multiple' == $add_type) {
             if (is_array($extra_field_list)) {
                 if (is_array($new_field_list) && count($new_field_list) > 0) {
                     echo '<h3>'.get_lang('Filter users').'</h3>';
@@ -640,7 +640,7 @@ $newLinks .= Display::url(
                         echo '<option value="0">--'.get_lang('Select').'--</option>';
                         foreach ($new_field['data'] as $option) {
                             $checked = '';
-                            if ($fieldtype == ExtraField::FIELD_TYPE_TAG) {
+                            if (ExtraField::FIELD_TYPE_TAG == $fieldtype) {
                                 if (isset($_POST[$varname])) {
                                     if ($_POST[$varname] == $option['tag']) {
                                         $checked = 'selected="true"';
@@ -658,7 +658,7 @@ $newLinks .= Display::url(
                         }
                         echo '</select>';
                         $extraHidden =
-                            $fieldtype == ExtraField::FIELD_TYPE_TAG ? '<input type="hidden" name="field_id" value="'
+                            ExtraField::FIELD_TYPE_TAG == $fieldtype ? '<input type="hidden" name="field_id" value="'
                                 .$option['field_id'].'" />' : '';
                         echo $extraHidden;
                         echo '&nbsp;&nbsp;';
@@ -682,7 +682,7 @@ $newLinks .= Display::url(
                 <div class="form-group">
                     <label><?php echo get_lang('Portal users list'); ?> </label>
                     <?php
-                    if (!($add_type == 'multiple')) {
+                    if (!('multiple' == $add_type)) {
                         ?>
                         <input type="text" id="user_to_add" onkeyup="xajax_search_users(this.value,'single')"
                                class="form-control"/>
@@ -727,7 +727,7 @@ $newLinks .= Display::url(
             </div>
 
             <div class="col-md-4">
-                <?php if ($add_type == 'multiple') {
+                <?php if ('multiple' == $add_type) {
                         ?>
                     <?php echo get_lang('First letter (last name)'); ?> :
                     <select id="first_letter_user" name="firstLetterUser" onchange="change_select(this.value);">
diff --git a/public/main/session/add_many_session_to_category.php b/public/main/session/add_many_session_to_category.php
index 6643dbe351..b7347d43b5 100644
--- a/public/main/session/add_many_session_to_category.php
+++ b/public/main/session/add_many_session_to_category.php
@@ -31,7 +31,7 @@ $tbl_course = Database::get_main_table(TABLE_MAIN_COURSE);
 $tool_name = get_lang('Subscription sessions in the category');
 
 $add_type = 'multiple';
-if (isset($_GET['add_type']) && $_GET['add_type'] != '') {
+if (isset($_GET['add_type']) && '' != $_GET['add_type']) {
     $add_type = Security::remove_XSS($_REQUEST['add_type']);
 }
 
@@ -83,7 +83,7 @@ if (isset($_POST['formSent']) && $_POST['formSent']) {
     $formSent = $_POST['formSent'];
     $sessionCategoryList = $_POST['SessionCategoryList'];
 
-    if ($categoryId != 0 && count($sessionCategoryList) > 0) {
+    if (0 != $categoryId && count($sessionCategoryList) > 0) {
         // Removing all
         $sql = "UPDATE $tbl_session SET session_category_id = NULL WHERE session_category_id = $categoryId";
         Database::query($sql);
@@ -105,11 +105,11 @@ if (isset($_GET['id_category'])) {
     $categoryId = intval($_GET['id_category']);
 }
 
-if (isset($_GET['msg']) && $_GET['msg'] == 'error') {
+if (isset($_GET['msg']) && 'error' == $_GET['msg']) {
     $errorMsg = get_lang('Select category and sessions');
 }
 
-if (isset($_GET['msg']) && $_GET['msg'] == 'ok') {
+if (isset($_GET['msg']) && 'ok' == $_GET['msg']) {
     $OkMsg = get_lang('Category update');
 }
 
@@ -119,7 +119,7 @@ Display::display_header($tool_name);
 
 $where = '';
 $rows_category_session = [];
-if ((isset($_POST['CategorySessionId']) && $_POST['formSent'] == 0) || isset($_GET['id_category'])) {
+if ((isset($_POST['CategorySessionId']) && 0 == $_POST['formSent']) || isset($_GET['id_category'])) {
     $where = 'WHERE session_category_id != '.$categoryId.' OR session_category_id IS NULL';
     $sql = 'SELECT id, name  FROM '.$tbl_session.' WHERE session_category_id ='.$categoryId.' ORDER BY name';
     $result = Database::query($sql);
@@ -204,7 +204,7 @@ if (!empty($OkMsg)) {
   <td align="center" width="45%"><b><?php echo get_lang('Session listInCategory'); ?> :</b></td>
 </tr>
 
-<?php if ($add_type == 'multiple') {
+<?php if ('multiple' == $add_type) {
                 ?>
 <tr>
 <td>&nbsp;</td></tr>
diff --git a/public/main/session/add_students_to_session.php b/public/main/session/add_students_to_session.php
index 27faf3bf2d..5db72ce38b 100644
--- a/public/main/session/add_students_to_session.php
+++ b/public/main/session/add_students_to_session.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *   @package chamilo.admin
- */
 // resetting the course id
 $cidReset = true;
 
@@ -22,7 +19,7 @@ $interbreadcrumb[] = [
 // Setting the name of the tool
 $tool_name = get_lang('Subscribe students to session(s)');
 $add_type = 'multiple';
-if (isset($_REQUEST['add_type']) && $_REQUEST['add_type'] != '') {
+if (isset($_REQUEST['add_type']) && '' != $_REQUEST['add_type']) {
     $add_type = Security::remove_XSS($_REQUEST['add_type']);
 }
 $form_sent = 0;
@@ -34,7 +31,7 @@ SessionManager::protectSession($id);
 $htmlResult = '';
 if (isset($_POST['form_sent']) && $_POST['form_sent']) {
     $form_sent = $_POST['form_sent'];
-    if ($form_sent == 1) {
+    if (1 == $form_sent) {
         $sessionSourceList = $_POST['sessions'];
         $sessionDestinationList = $_POST['sessions_destination'];
         $result = SessionManager::copyStudentsFromSession(
diff --git a/public/main/session/add_teachers_to_session.php b/public/main/session/add_teachers_to_session.php
index 01c5c1f26b..733cde1111 100644
--- a/public/main/session/add_teachers_to_session.php
+++ b/public/main/session/add_teachers_to_session.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *   @package chamilo.admin
- */
 // resetting the course id
 $cidReset = true;
 
@@ -32,7 +29,7 @@ $htmlResult = '';
 if (isset($_POST['form_sent']) && $_POST['form_sent']) {
     $form_sent = $_POST['form_sent'];
 
-    if ($form_sent == 1 &&
+    if (1 == $form_sent &&
         isset($_POST['sessions']) && isset($_POST['courses'])
     ) {
         $sessions = $_POST['sessions'];
diff --git a/public/main/session/add_users_to_session.php b/public/main/session/add_users_to_session.php
index ed2670d8b4..babcba3d1f 100644
--- a/public/main/session/add_users_to_session.php
+++ b/public/main/session/add_users_to_session.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.admin
- */
 // resetting the course id
 $cidReset = true;
 
@@ -32,7 +29,7 @@ $tbl_session_rel_user = Database::get_main_table(TABLE_MAIN_SESSION_USER);
 // setting the name of the tool
 $tool_name = get_lang('Subscribe users to this session');
 $add_type = 'unique';
-if (isset($_REQUEST['add_type']) && $_REQUEST['add_type'] != '') {
+if (isset($_REQUEST['add_type']) && '' != $_REQUEST['add_type']) {
     $add_type = Security::remove_XSS($_REQUEST['add_type']);
 }
 
@@ -45,7 +42,7 @@ $new_field_list = [];
 if (is_array($extra_field_list)) {
     foreach ($extra_field_list as $extra_field) {
         //if is enabled to filter and is a "<select>" field type
-        if ($extra_field[8] == 1 && $extra_field[2] == ExtraField::FIELD_TYPE_SELECT) {
+        if (1 == $extra_field[8] && ExtraField::FIELD_TYPE_SELECT == $extra_field[2]) {
             $new_field_list[] = [
                 'name' => $extra_field[3],
                 'type' => $extra_field[2],
@@ -53,7 +50,7 @@ if (is_array($extra_field_list)) {
                 'data' => $extra_field[9],
             ];
         }
-        if ($extra_field[8] == 1 && $extra_field[2] == ExtraField::FIELD_TYPE_TAG) {
+        if (1 == $extra_field[8] && ExtraField::FIELD_TYPE_TAG == $extra_field[2]) {
             $options = UserManager::get_extra_user_data_for_tags($extra_field[1]);
             $new_field_list[] = [
                 'name' => $extra_field[3],
@@ -77,7 +74,7 @@ function search_users($needle, $type)
 
     if (!empty($needle) && !empty($type)) {
         // Normal behaviour
-        if ($type == 'any_session' && $needle == 'false') {
+        if ('any_session' == $type && 'false' == $needle) {
             $type = 'multiple';
             $needle = '';
         }
@@ -87,13 +84,13 @@ function search_users($needle, $type)
         $showOfficialCode = false;
 
         $orderListByOfficialCode = api_get_setting('order_user_list_by_official_code');
-        if ($orderListByOfficialCode === 'true') {
+        if ('true' === $orderListByOfficialCode) {
             $showOfficialCode = true;
             $order_clause = ' ORDER BY official_code, lastname, firstname, username';
         }
 
         if (api_is_session_admin()
-            && api_get_setting('prevent_session_admins_to_manage_all_users') === 'true'
+            && 'true' === api_get_setting('prevent_session_admins_to_manage_all_users')
         ) {
             $order_clause = " AND user.creator_id = ".api_get_user_id().$order_clause;
         }
@@ -166,7 +163,7 @@ function search_users($needle, $type)
         if (api_is_multiple_url_enabled()) {
             $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 switch ($type) {
                     case 'single':
                         $sql = "
@@ -221,7 +218,7 @@ function search_users($needle, $type)
 
         $rs = Database::query($sql);
         $i = 0;
-        if ($type == 'single') {
+        if ('single' == $type) {
             while ($user = Database:: fetch_array($rs)) {
                 $i++;
                 if ($i <= 10) {
@@ -323,7 +320,7 @@ if (isset($_POST['form_sent']) && $_POST['form_sent']) {
         $UserList = [];
     }
 
-    if ($form_sent == 1) {
+    if (1 == $form_sent) {
         //$notEmptyList = api_get_configuration_value('session_multiple_subscription_students_list_avoid_emptying');
 
         // Added a parameter to send emails when registering a user
@@ -344,7 +341,7 @@ Display::display_header($tool_name);
 
 $nosessionUsersList = $sessionUsersList = [];
 $where_filter = null;
-$ajax_search = $add_type == 'unique' ? true : false;
+$ajax_search = 'unique' == $add_type ? true : false;
 
 //$order_clause = api_sort_by_first_name() ? ' ORDER BY firstname, lastname, username' : ' ORDER BY lastname, firstname, username';
 // On this screen, it doesn't make sense to order users by firstname. Always use lastname first
@@ -355,7 +352,7 @@ $order_clause = ' ORDER BY lastname, firstname, username';
 
 $showOfficialCode = false;
 $orderListByOfficialCode = api_get_setting('order_user_list_by_official_code');
-if ($orderListByOfficialCode === 'true') {
+if ('true' === $orderListByOfficialCode) {
     $showOfficialCode = true;
     $order_clause = ' ORDER BY official_code, lastname, firstname, username';
 }
@@ -366,7 +363,7 @@ if ($ajax_search) {
     // Filter the user list in all courses in the session
     foreach ($sessionUserInfo as $sessionUser) {
         // filter students in session
-        if ($sessionUser['status_in_session'] != 0) {
+        if (0 != $sessionUser['status_in_session']) {
             continue;
         }
 
@@ -387,9 +384,9 @@ if ($ajax_search) {
                 $varname = 'field_'.$new_field['variable'];
                 $fieldtype = $new_field['type'];
                 if (UserManager::is_extra_field_available($new_field['variable'])) {
-                    if (isset($_POST[$varname]) && $_POST[$varname] != '0') {
+                    if (isset($_POST[$varname]) && '0' != $_POST[$varname]) {
                         $use_extra_fields = true;
-                        if ($fieldtype == ExtraField::FIELD_TYPE_TAG) {
+                        if (ExtraField::FIELD_TYPE_TAG == $fieldtype) {
                             $extra_field_result[] = UserManager::get_extra_user_data_by_tags(
                                 intval($_POST['field_id']),
                                 $_POST[$varname]
@@ -437,7 +434,7 @@ if ($ajax_search) {
             }
         }
     }
-    if (api_is_session_admin() && api_get_setting('prevent_session_admins_to_manage_all_users') === 'true') {
+    if (api_is_session_admin() && 'true' === api_get_setting('prevent_session_admins_to_manage_all_users')) {
         $order_clause = " AND u.creator_id = ".api_get_user_id().$order_clause;
     }
     if ($use_extra_fields) {
@@ -468,7 +465,7 @@ if ($ajax_search) {
     if (api_is_multiple_url_enabled()) {
         $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             $sql = "
                 SELECT  u.id, lastname, firstname, username, session_id, official_code
                 FROM $tbl_user u
@@ -516,7 +513,7 @@ if ($ajax_search) {
     if (api_is_multiple_url_enabled()) {
         $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             $sql = "
                 SELECT  u.id, lastname, firstname, username, session_id, official_code
                 FROM $tbl_user u
@@ -547,7 +544,7 @@ if ($ajax_search) {
     unset($users); //clean to free memory
 }
 
-if ($add_type == 'multiple') {
+if ('multiple' == $add_type) {
     $link_add_type_unique =
         '<a href="'.api_get_self().'?id_session='.$id_session.'&add='.$addProcess.'&add_type=unique">'.
         Display::return_icon('single.gif').get_lang('Single registration').'</a>';
@@ -590,7 +587,7 @@ $newLinks .= Display::url(
         } ?>>
         <?php echo '<legend>'.$tool_name.' ('.$session_info['name'].') </legend>'; ?>
         <?php
-        if ($add_type == 'multiple') {
+        if ('multiple' == $add_type) {
             if (is_array($extra_field_list)) {
                 if (is_array($new_field_list) && count($new_field_list) > 0) {
                     echo '<h3>'.get_lang('Filter users').'</h3>';
@@ -602,7 +599,7 @@ $newLinks .= Display::url(
                         echo '<option value="0">--'.get_lang('Select').'--</option>';
                         foreach ($new_field['data'] as $option) {
                             $checked = '';
-                            if ($fieldtype == ExtraField::FIELD_TYPE_TAG) {
+                            if (ExtraField::FIELD_TYPE_TAG == $fieldtype) {
                                 if (isset($_POST[$varname])) {
                                     if ($_POST[$varname] == $option['tag']) {
                                         $checked = 'selected="true"';
@@ -620,7 +617,7 @@ $newLinks .= Display::url(
                         }
                         echo '</select>';
                         $extraHidden =
-                            $fieldtype == ExtraField::FIELD_TYPE_TAG ? '<input type="hidden" name="field_id" value="'
+                            ExtraField::FIELD_TYPE_TAG == $fieldtype ? '<input type="hidden" name="field_id" value="'
                                 .$option['field_id'].'" />' : '';
                         echo $extraHidden;
                         echo '&nbsp;&nbsp;';
@@ -643,7 +640,7 @@ $newLinks .= Display::url(
             <div class="col-md-4">
                 <div class="form-group">
                     <?php
-                    if (!($add_type == 'multiple')) {
+                    if (!('multiple' == $add_type)) {
                         ?>
                         <input
                                 placeholder="<?php echo get_lang('Search'); ?>"
@@ -690,7 +687,7 @@ $newLinks .= Display::url(
             </div>
 
             <div class="col-md-4">
-                <?php if ($add_type == 'multiple') {
+                <?php if ('multiple' == $add_type) {
                         ?>
                     <?php echo get_lang('First letter (last name)'); ?> :
                     <select id="first_letter_user" name="firstLetterUser" onchange="change_select(this.value);">
diff --git a/public/main/session/add_users_to_session_course.php b/public/main/session/add_users_to_session_course.php
index 76f4a7f9c7..37fe1b6663 100644
--- a/public/main/session/add_users_to_session_course.php
+++ b/public/main/session/add_users_to_session_course.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.admin
- */
 // resetting the course id
 $cidReset = true;
 
@@ -45,7 +42,7 @@ $tableRelSessionCourseUser = Database::get_main_table(TABLE_MAIN_SESSION_COURSE_
 // setting the name of the tool
 $tool_name = get_lang('Subscribe users to this session');
 $add_type = 'unique';
-if (isset($_REQUEST['add_type']) && $_REQUEST['add_type'] != '') {
+if (isset($_REQUEST['add_type']) && '' != $_REQUEST['add_type']) {
     $add_type = Security::remove_XSS($_REQUEST['add_type']);
 }
 
@@ -59,7 +56,7 @@ $new_field_list = [];
 if (is_array($extra_field_list)) {
     foreach ($extra_field_list as $extra_field) {
         //if is enabled to filter and is a "<select>" field type
-        if ($extra_field[8] == 1 && $extra_field[2] == ExtraField::FIELD_TYPE_SELECT) {
+        if (1 == $extra_field[8] && ExtraField::FIELD_TYPE_SELECT == $extra_field[2]) {
             $new_field_list[] = [
                 'name' => $extra_field[3],
                 'type' => $extra_field[2],
@@ -67,7 +64,7 @@ if (is_array($extra_field_list)) {
                 'data' => $extra_field[9],
             ];
         }
-        if ($extra_field[8] == 1 && $extra_field[2] == ExtraField::FIELD_TYPE_TAG) {
+        if (1 == $extra_field[8] && ExtraField::FIELD_TYPE_TAG == $extra_field[2]) {
             $options = UserManager::get_extra_user_data_for_tags($extra_field[1]);
             $new_field_list[] = [
                 'name' => $extra_field[3],
@@ -92,7 +89,7 @@ function search_users($needle, $type)
 
     if (!empty($needle) && !empty($type)) {
         // Normal behaviour
-        if ($type == 'any_session' && $needle == 'false') {
+        if ('any_session' == $type && 'false' == $needle) {
             $type = 'multiple';
             $needle = '';
         }
@@ -102,13 +99,13 @@ function search_users($needle, $type)
         $showOfficialCode = false;
 
         $orderListByOfficialCode = api_get_setting('order_user_list_by_official_code');
-        if ($orderListByOfficialCode === 'true') {
+        if ('true' === $orderListByOfficialCode) {
             $showOfficialCode = true;
             $order_clause = ' ORDER BY official_code, lastname, firstname, username';
         }
 
         if (api_is_session_admin()
-            && api_get_setting('prevent_session_admins_to_manage_all_users') === 'true'
+            && 'true' === api_get_setting('prevent_session_admins_to_manage_all_users')
         ) {
             $order_clause = ' AND user.creator_id = '.api_get_user_id().$order_clause;
         }
@@ -189,7 +186,7 @@ function search_users($needle, $type)
         if (api_is_multiple_url_enabled()) {
             $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 switch ($type) {
                     case 'single':
                         $sql = "
@@ -244,7 +241,7 @@ function search_users($needle, $type)
 
         $rs = Database::query($sql);
         $i = 0;
-        if ($type == 'single') {
+        if ('single' == $type) {
             while ($user = Database:: fetch_array($rs)) {
                 $i++;
                 if ($i <= 10) {
@@ -343,7 +340,7 @@ if (isset($_POST['form_sent']) && $_POST['form_sent']) {
         $UserList = [];
     }
 
-    if ($form_sent == 1) {
+    if (1 == $form_sent) {
         // Added a parameter to send emails when registering a user
         SessionManager::subscribeUsersToSession(
             $id_session,
@@ -370,7 +367,7 @@ Display::display_header($tool_name);
 
 $nosessionUsersList = $sessionUsersList = [];
 $where_filter = null;
-$ajax_search = $add_type == 'unique' ? true : false;
+$ajax_search = 'unique' == $add_type ? true : false;
 
 //$order_clause = api_sort_by_first_name() ? ' ORDER BY firstname, lastname, username' : ' ORDER BY lastname, firstname, username';
 // On this screen, it doesn't make sense to order users by firstname. Always use lastname first
@@ -381,7 +378,7 @@ $order_clause = ' ORDER BY lastname, firstname, username';
 
 $showOfficialCode = false;
 $orderListByOfficialCode = api_get_setting('order_user_list_by_official_code');
-if ($orderListByOfficialCode === 'true') {
+if ('true' === $orderListByOfficialCode) {
     $showOfficialCode = true;
     $order_clause = ' ORDER BY official_code, lastname, firstname, username';
 }
@@ -406,7 +403,7 @@ if ($ajax_search) {
     if (api_is_multiple_url_enabled()) {
         $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             $sql = "
                 SELECT u.id, u.lastname, u.firstname, u.username, su.session_id, u.official_code
                 FROM $tbl_user u
@@ -438,7 +435,7 @@ if ($ajax_search) {
     // Filter the user list in all courses in the session
     foreach ($sessionUserInfo as $sessionUser) {
         // filter students in session
-        if ($sessionUser['status_in_session'] != 0) {
+        if (0 != $sessionUser['status_in_session']) {
             continue;
         }
 
@@ -459,9 +456,9 @@ if ($ajax_search) {
                 $varname = 'field_'.$new_field['variable'];
                 $fieldtype = $new_field['type'];
                 if (UserManager::is_extra_field_available($new_field['variable'])) {
-                    if (isset($_POST[$varname]) && $_POST[$varname] != '0') {
+                    if (isset($_POST[$varname]) && '0' != $_POST[$varname]) {
                         $use_extra_fields = true;
-                        if ($fieldtype == ExtraField::FIELD_TYPE_TAG) {
+                        if (ExtraField::FIELD_TYPE_TAG == $fieldtype) {
                             $extra_field_result[] = UserManager::get_extra_user_data_by_tags(
                                 $_POST['field_id'],
                                 $_POST[$varname]
@@ -509,7 +506,7 @@ if ($ajax_search) {
             }
         }
     }
-    if (api_is_session_admin() && api_get_setting('prevent_session_admins_to_manage_all_users') === 'true') {
+    if (api_is_session_admin() && 'true' === api_get_setting('prevent_session_admins_to_manage_all_users')) {
         $order_clause = " AND u.creator_id = ".api_get_user_id().$order_clause;
     }
     if ($use_extra_fields) {
@@ -545,7 +542,7 @@ if ($ajax_search) {
     if (api_is_multiple_url_enabled()) {
         $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             $sql = "
                 SELECT  u.id, lastname, firstname, username, su.session_id, official_code
                 FROM $tbl_user u
@@ -600,7 +597,7 @@ if ($ajax_search) {
     if (api_is_multiple_url_enabled()) {
         $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             $sql = "
                 SELECT  u.id, lastname, firstname, username, su.session_id, official_code
                 FROM $tbl_user u
@@ -636,7 +633,7 @@ if ($ajax_search) {
     unset($users); //clean to free memory
 }
 
-if ($add_type == 'multiple') {
+if ('multiple' == $add_type) {
     $link_add_type_unique =
         '<a href="'.api_get_self().'?course_id='.$courseId.'&id_session='.$id_session.'&add='.$addProcess.'&add_type=unique">'.
         Display::return_icon('single.gif').get_lang('Single registration').'</a>';
@@ -662,7 +659,7 @@ if ($add_type == 'multiple') {
         } ?>>
         <?php echo '<legend>'.$tool_name.' ('.$session_info['name'].') - '.$courseInfo['title'].' </legend>'; ?>
         <?php
-        if ($add_type == 'multiple') {
+        if ('multiple' == $add_type) {
             if (is_array($extra_field_list)) {
                 if (is_array($new_field_list) && count($new_field_list) > 0) {
                     echo '<h3>'.get_lang('Filter users').'</h3>';
@@ -674,7 +671,7 @@ if ($add_type == 'multiple') {
                         echo '<option value="0">--'.get_lang('Select').'--</option>';
                         foreach ($new_field['data'] as $option) {
                             $checked = '';
-                            if ($fieldtype == ExtraField::FIELD_TYPE_TAG) {
+                            if (ExtraField::FIELD_TYPE_TAG == $fieldtype) {
                                 if (isset($_POST[$varname])) {
                                     if ($_POST[$varname] == $option['tag']) {
                                         $checked = 'selected="true"';
@@ -692,7 +689,7 @@ if ($add_type == 'multiple') {
                         }
                         echo '</select>';
                         $extraHidden =
-                            $fieldtype == ExtraField::FIELD_TYPE_TAG ? '<input type="hidden" name="field_id" value="'
+                            ExtraField::FIELD_TYPE_TAG == $fieldtype ? '<input type="hidden" name="field_id" value="'
                                 .$option['field_id'].'" />' : '';
                         echo $extraHidden;
                         echo '&nbsp;&nbsp;';
@@ -716,7 +713,7 @@ if ($add_type == 'multiple') {
                 <div class="form-group">
                     <label><?php echo get_lang('Portal users list'); ?> </label>
                     <?php
-                    if (!($add_type == 'multiple')) {
+                    if (!('multiple' == $add_type)) {
                         ?>
                         <input type="text" id="user_to_add" onkeyup="xajax_search_users(this.value,'single')"
                                class="form-control"/>
@@ -757,7 +754,7 @@ if ($add_type == 'multiple') {
             </div>
 
             <div class="col-md-4">
-                <?php if ($add_type == 'multiple') {
+                <?php if ('multiple' == $add_type) {
                         ?>
                     <?php echo get_lang('First letter (last name)'); ?> :
                     <select id="first_letter_user" name="firstLetterUser" onchange="change_select(this.value);">
diff --git a/public/main/session/index.php b/public/main/session/index.php
index af36eb7be4..3eb02baa18 100644
--- a/public/main/session/index.php
+++ b/public/main/session/index.php
@@ -9,7 +9,6 @@ use ChamiloSession as Session;
  *
  *   @author Julio Montoya <gugli100@gmail.com>  Beeznest
  */
-
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -24,7 +23,7 @@ $valueAllowVisitors = $sessionField->get_values_by_handler_and_field_variable(
     $session_id,
     'allow_visitors'
 );
-$allowVisitors = $valueAllowVisitors != false;
+$allowVisitors = false != $valueAllowVisitors;
 
 if (!$allowVisitors) {
     // Only users who are logged in can proceed.
@@ -56,7 +55,7 @@ foreach ($courseList as $course) {
         $course['real_id'],
         $session_id
     );
-    if ($status !== false || api_is_platform_admin() || $userIsGeneralCoach) {
+    if (false !== $status || api_is_platform_admin() || $userIsGeneralCoach) {
         $user_course_list[] = $course['real_id'];
     }
 
@@ -78,7 +77,7 @@ foreach ($courseList as $course) {
                 $exerciseId,
                 $session_id
             );
-            if ($visibility == 0) {
+            if (0 == $visibility) {
                 continue;
             }
             $exerciseListNew[] = $exerciseInfo;
@@ -182,7 +181,7 @@ if (!empty($courseList)) {
 }
 
 //If session is not active we stop de script
-if (api_is_coach_of_course_in_session($session_id) == false) {
+if (false == api_is_coach_of_course_in_session($session_id)) {
     //If session is not active we stop de script
     if (!api_is_allowed_to_session_edit()) {
         api_not_allowed(true);
@@ -193,7 +192,7 @@ $entityManager = Database::getManager();
 $session = $entityManager->find('ChamiloCoreBundle:Session', $session_id);
 $sessionTitleLink = api_get_configuration_value('courses_list_session_title_link');
 
-if ($sessionTitleLink == 2 && $session->getNbrCourses() === 1) {
+if (2 == $sessionTitleLink && 1 === $session->getNbrCourses()) {
     $sessionCourses = $session->getCourses();
     $sessionCourse = $sessionCourses[0]->getCourse();
     $courseUrl = $sessionCourse->getDirectory().'/index.php?';
@@ -258,7 +257,7 @@ if (!empty($courseList)) {
         if (!empty($exerciseList)) {
             // Exercises
             foreach ($exerciseList as $exerciseInfo) {
-                if ($exerciseInfo['start_time'] == '0000-00-00 00:00:00') {
+                if ('0000-00-00 00:00:00' == $exerciseInfo['start_time']) {
                     $start_date = '-';
                 } else {
                     $start_date = $exerciseInfo['start_time'];
@@ -287,7 +286,7 @@ if (!empty($courseList)) {
 
                 if (empty($exerciseResultInfo)) {
                     // We check the date validation of the exercise if the user can make it
-                    if ($exerciseInfo['start_time'] != '0000-00-00 00:00:00') {
+                    if ('0000-00-00 00:00:00' != $exerciseInfo['start_time']) {
                         $allowed_time = api_strtotime($exerciseInfo['start_time'], 'UTC');
                         if ($now < $allowed_time) {
                             continue;
@@ -326,7 +325,7 @@ if (!empty($courseList)) {
                     );
                     $my_score = 0;
                     if (!empty($result['max_score']) &&
-                        intval($result['max_score']) != 0
+                        0 != intval($result['max_score'])
                     ) {
                         $my_score = $result['score'] / $result['max_score'];
                     }
@@ -400,9 +399,9 @@ if (api_is_platform_admin()) {
 
 echo Display::tag('h1', $session_info['name'].$editLink);
 echo $dates.'<br />';
-$allow = api_get_setting('show_session_description') === 'true';
+$allow = 'true' === api_get_setting('show_session_description');
 
-if ($session_info['show_description'] == 1 && $allow) {
+if (1 == $session_info['show_description'] && $allow) {
     ?>
     <div class="home-course-intro">
         <div class="page-course">
diff --git a/public/main/session/resume_session.php b/public/main/session/resume_session.php
index 5a6a9ba2be..99717677e4 100644
--- a/public/main/session/resume_session.php
+++ b/public/main/session/resume_session.php
@@ -10,8 +10,6 @@ use Chamilo\CoreBundle\Repository\SessionRepository;
 
 /**
  * @author  Bart Mollet, Julio Montoya lot of fixes
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -160,7 +158,7 @@ $courseListToShow .= '<table id="session-list-course" class="table table-hover d
   <th width="25%">'.get_lang('Detail').'</th>
 </tr>';
 
-if ($session->getNbrCourses() === 0) {
+if (0 === $session->getNbrCourses()) {
     $courseListToShow .= '<tr>
 			<td colspan="4">'.get_lang('No course for this session').'</td>
 		</tr>';
diff --git a/public/main/session/session_add.php b/public/main/session/session_add.php
index 56d88ff060..1ee02dbff8 100644
--- a/public/main/session/session_add.php
+++ b/public/main/session/session_add.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.admin
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
@@ -52,7 +49,7 @@ function search_coachs($needle)
         if (api_is_multiple_url_enabled()) {
             $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql = 'SELECT username, lastname, firstname
                         FROM '.$tbl_user.' user
                         INNER JOIN '.$tbl_user_rel_access_url.' url_user
@@ -389,7 +386,7 @@ if ($form->validate()) {
 
     $extraFields = [];
     foreach ($params as $key => $value) {
-        if (strpos($key, 'extra_') === 0) {
+        if (0 === strpos($key, 'extra_')) {
             $extraFields[$key] = $value;
         }
     }
diff --git a/public/main/session/session_category_add.php b/public/main/session/session_category_add.php
index 58f684866e..efb021fa13 100644
--- a/public/main/session/session_category_add.php
+++ b/public/main/session/session_category_add.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.admin
- *
  * @todo use formvalidator for the form
  */
 $cidReset = true;
@@ -94,131 +92,131 @@ if (!empty($return)) {
                 <div class="col-sm-6">
                     <select name="day_start">
                         <option value="1">01</option>
-                        <option value="2" <?php if ((!$formSent && $thisDay == 2) || ($formSent && $day_start == 2)) {
+                        <option value="2" <?php if ((!$formSent && 2 == $thisDay) || ($formSent && 2 == $day_start)) {
     echo 'selected="selected"';
 } ?> >02</option>
-                        <option value="3" <?php if ((!$formSent && $thisDay == 3) || ($formSent && $day_start == 3)) {
+                        <option value="3" <?php if ((!$formSent && 3 == $thisDay) || ($formSent && 3 == $day_start)) {
     echo 'selected="selected"';
 } ?> >03</option>
-                        <option value="4" <?php if ((!$formSent && $thisDay == 4) || ($formSent && $day_start == 4)) {
+                        <option value="4" <?php if ((!$formSent && 4 == $thisDay) || ($formSent && 4 == $day_start)) {
     echo 'selected="selected"';
 } ?> >04</option>
-                        <option value="5" <?php if ((!$formSent && $thisDay == 5) || ($formSent && $day_start == 5)) {
+                        <option value="5" <?php if ((!$formSent && 5 == $thisDay) || ($formSent && 5 == $day_start)) {
     echo 'selected="selected"';
 } ?> >05</option>
-                        <option value="6" <?php if ((!$formSent && $thisDay == 6) || ($formSent && $day_start == 6)) {
+                        <option value="6" <?php if ((!$formSent && 6 == $thisDay) || ($formSent && 6 == $day_start)) {
     echo 'selected="selected"';
 } ?> >06</option>
-                        <option value="7" <?php if ((!$formSent && $thisDay == 7) || ($formSent && $day_start == 7)) {
+                        <option value="7" <?php if ((!$formSent && 7 == $thisDay) || ($formSent && 7 == $day_start)) {
     echo 'selected="selected"';
 } ?> >07</option>
-                        <option value="8" <?php if ((!$formSent && $thisDay == 8) || ($formSent && $day_start == 8)) {
+                        <option value="8" <?php if ((!$formSent && 8 == $thisDay) || ($formSent && 8 == $day_start)) {
     echo 'selected="selected"';
 } ?> >08</option>
-                        <option value="9" <?php if ((!$formSent && $thisDay == 9) || ($formSent && $day_start == 9)) {
+                        <option value="9" <?php if ((!$formSent && 9 == $thisDay) || ($formSent && 9 == $day_start)) {
     echo 'selected="selected"';
 } ?> >09</option>
-                        <option value="10" <?php if ((!$formSent && $thisDay == 10) || ($formSent && $day_start == 10)) {
+                        <option value="10" <?php if ((!$formSent && 10 == $thisDay) || ($formSent && 10 == $day_start)) {
     echo 'selected="selected"';
 } ?> >10</option>
-                        <option value="11" <?php if ((!$formSent && $thisDay == 11) || ($formSent && $day_start == 11)) {
+                        <option value="11" <?php if ((!$formSent && 11 == $thisDay) || ($formSent && 11 == $day_start)) {
     echo 'selected="selected"';
 } ?> >11</option>
-                        <option value="12" <?php if ((!$formSent && $thisDay == 12) || ($formSent && $day_start == 12)) {
+                        <option value="12" <?php if ((!$formSent && 12 == $thisDay) || ($formSent && 12 == $day_start)) {
     echo 'selected="selected"';
 } ?> >12</option>
-                        <option value="13" <?php if ((!$formSent && $thisDay == 13) || ($formSent && $day_start == 13)) {
+                        <option value="13" <?php if ((!$formSent && 13 == $thisDay) || ($formSent && 13 == $day_start)) {
     echo 'selected="selected"';
 } ?> >13</option>
-                        <option value="14" <?php if ((!$formSent && $thisDay == 14) || ($formSent && $day_start == 14)) {
+                        <option value="14" <?php if ((!$formSent && 14 == $thisDay) || ($formSent && 14 == $day_start)) {
     echo 'selected="selected"';
 } ?> >14</option>
-                        <option value="15" <?php if ((!$formSent && $thisDay == 15) || ($formSent && $day_start == 15)) {
+                        <option value="15" <?php if ((!$formSent && 15 == $thisDay) || ($formSent && 15 == $day_start)) {
     echo 'selected="selected"';
 } ?> >15</option>
-                        <option value="16" <?php if ((!$formSent && $thisDay == 16) || ($formSent && $day_start == 16)) {
+                        <option value="16" <?php if ((!$formSent && 16 == $thisDay) || ($formSent && 16 == $day_start)) {
     echo 'selected="selected"';
 } ?> >16</option>
-                        <option value="17" <?php if ((!$formSent && $thisDay == 17) || ($formSent && $day_start == 17)) {
+                        <option value="17" <?php if ((!$formSent && 17 == $thisDay) || ($formSent && 17 == $day_start)) {
     echo 'selected="selected"';
 } ?> >17</option>
-                        <option value="18" <?php if ((!$formSent && $thisDay == 18) || ($formSent && $day_start == 18)) {
+                        <option value="18" <?php if ((!$formSent && 18 == $thisDay) || ($formSent && 18 == $day_start)) {
     echo 'selected="selected"';
 } ?> >18</option>
-                        <option value="19" <?php if ((!$formSent && $thisDay == 19) || ($formSent && $day_start == 19)) {
+                        <option value="19" <?php if ((!$formSent && 19 == $thisDay) || ($formSent && 19 == $day_start)) {
     echo 'selected="selected"';
 } ?> >19</option>
-                        <option value="20" <?php if ((!$formSent && $thisDay == 20) || ($formSent && $day_start == 20)) {
+                        <option value="20" <?php if ((!$formSent && 20 == $thisDay) || ($formSent && 20 == $day_start)) {
     echo 'selected="selected"';
 } ?> >20</option>
-                        <option value="21" <?php if ((!$formSent && $thisDay == 21) || ($formSent && $day_start == 21)) {
+                        <option value="21" <?php if ((!$formSent && 21 == $thisDay) || ($formSent && 21 == $day_start)) {
     echo 'selected="selected"';
 } ?> >21</option>
-                        <option value="22" <?php if ((!$formSent && $thisDay == 22) || ($formSent && $day_start == 22)) {
+                        <option value="22" <?php if ((!$formSent && 22 == $thisDay) || ($formSent && 22 == $day_start)) {
     echo 'selected="selected"';
 } ?> >22</option>
-                        <option value="23" <?php if ((!$formSent && $thisDay == 23) || ($formSent && $day_start == 23)) {
+                        <option value="23" <?php if ((!$formSent && 23 == $thisDay) || ($formSent && 23 == $day_start)) {
     echo 'selected="selected"';
 } ?> >23</option>
-                        <option value="24" <?php if ((!$formSent && $thisDay == 24) || ($formSent && $day_start == 24)) {
+                        <option value="24" <?php if ((!$formSent && 24 == $thisDay) || ($formSent && 24 == $day_start)) {
     echo 'selected="selected"';
 } ?> >24</option>
-                        <option value="25" <?php if ((!$formSent && $thisDay == 25) || ($formSent && $day_start == 25)) {
+                        <option value="25" <?php if ((!$formSent && 25 == $thisDay) || ($formSent && 25 == $day_start)) {
     echo 'selected="selected"';
 } ?> >25</option>
-                        <option value="26" <?php if ((!$formSent && $thisDay == 26) || ($formSent && $day_start == 26)) {
+                        <option value="26" <?php if ((!$formSent && 26 == $thisDay) || ($formSent && 26 == $day_start)) {
     echo 'selected="selected"';
 } ?> >26</option>
-                        <option value="27" <?php if ((!$formSent && $thisDay == 27) || ($formSent && $day_start == 27)) {
+                        <option value="27" <?php if ((!$formSent && 27 == $thisDay) || ($formSent && 27 == $day_start)) {
     echo 'selected="selected"';
 } ?> >27</option>
-                        <option value="28" <?php if ((!$formSent && $thisDay == 28) || ($formSent && $day_start == 28)) {
+                        <option value="28" <?php if ((!$formSent && 28 == $thisDay) || ($formSent && 28 == $day_start)) {
     echo 'selected="selected"';
 } ?> >28</option>
-                        <option value="29" <?php if ((!$formSent && $thisDay == 29) || ($formSent && $day_start == 29)) {
+                        <option value="29" <?php if ((!$formSent && 29 == $thisDay) || ($formSent && 29 == $day_start)) {
     echo 'selected="selected"';
 } ?> >29</option>
-                        <option value="30" <?php if ((!$formSent && $thisDay == 30) || ($formSent && $day_start == 30)) {
+                        <option value="30" <?php if ((!$formSent && 30 == $thisDay) || ($formSent && 30 == $day_start)) {
     echo 'selected="selected"';
 } ?> >30</option>
-                        <option value="31" <?php if ((!$formSent && $thisDay == 31) || ($formSent && $day_start == 31)) {
+                        <option value="31" <?php if ((!$formSent && 31 == $thisDay) || ($formSent && 31 == $day_start)) {
     echo 'selected="selected"';
 } ?> >31</option>
                     </select>
                     /
                     <select name="month_start">
                           <option value="1">01</option>
-                          <option value="2" <?php if ((!$formSent && $thisMonth == 2) || ($formSent && $month_start == 2)) {
+                          <option value="2" <?php if ((!$formSent && 2 == $thisMonth) || ($formSent && 2 == $month_start)) {
     echo 'selected="selected"';
 } ?> >02</option>
-                          <option value="3" <?php if ((!$formSent && $thisMonth == 3) || ($formSent && $month_start == 3)) {
+                          <option value="3" <?php if ((!$formSent && 3 == $thisMonth) || ($formSent && 3 == $month_start)) {
     echo 'selected="selected"';
 } ?> >03</option>
-                          <option value="4" <?php if ((!$formSent && $thisMonth == 4) || ($formSent && $month_start == 4)) {
+                          <option value="4" <?php if ((!$formSent && 4 == $thisMonth) || ($formSent && 4 == $month_start)) {
     echo 'selected="selected"';
 } ?> >04</option>
-                          <option value="5" <?php if ((!$formSent && $thisMonth == 5) || ($formSent && $month_start == 5)) {
+                          <option value="5" <?php if ((!$formSent && 5 == $thisMonth) || ($formSent && 5 == $month_start)) {
     echo 'selected="selected"';
 } ?> >05</option>
-                          <option value="6" <?php if ((!$formSent && $thisMonth == 6) || ($formSent && $month_start == 6)) {
+                          <option value="6" <?php if ((!$formSent && 6 == $thisMonth) || ($formSent && 6 == $month_start)) {
     echo 'selected="selected"';
 } ?> >06</option>
-                          <option value="7" <?php if ((!$formSent && $thisMonth == 7) || ($formSent && $month_start == 7)) {
+                          <option value="7" <?php if ((!$formSent && 7 == $thisMonth) || ($formSent && 7 == $month_start)) {
     echo 'selected="selected"';
 } ?> >07</option>
-                          <option value="8" <?php if ((!$formSent && $thisMonth == 8) || ($formSent && $month_start == 8)) {
+                          <option value="8" <?php if ((!$formSent && 8 == $thisMonth) || ($formSent && 8 == $month_start)) {
     echo 'selected="selected"';
 } ?> >08</option>
-                          <option value="9" <?php if ((!$formSent && $thisMonth == 9) || ($formSent && $month_start == 9)) {
+                          <option value="9" <?php if ((!$formSent && 9 == $thisMonth) || ($formSent && 9 == $month_start)) {
     echo 'selected="selected"';
 } ?> >09</option>
-                          <option value="10" <?php if ((!$formSent && $thisMonth == 10) || ($formSent && $month_start == 10)) {
+                          <option value="10" <?php if ((!$formSent && 10 == $thisMonth) || ($formSent && 10 == $month_start)) {
     echo 'selected="selected"';
 } ?> >10</option>
-                          <option value="11" <?php if ((!$formSent && $thisMonth == 11) || ($formSent && $month_start == 11)) {
+                          <option value="11" <?php if ((!$formSent && 11 == $thisMonth) || ($formSent && 11 == $month_start)) {
     echo 'selected="selected"';
 } ?> >11</option>
-                          <option value="12" <?php if ((!$formSent && $thisMonth == 12) || ($formSent && $month_start == 12)) {
+                          <option value="12" <?php if ((!$formSent && 12 == $thisMonth) || ($formSent && 12 == $month_start)) {
     echo 'selected="selected"';
 } ?> >12</option>
                     </select>
diff --git a/public/main/session/session_category_edit.php b/public/main/session/session_category_edit.php
index 08ab73274a..3dde971ec7 100644
--- a/public/main/session/session_category_edit.php
+++ b/public/main/session/session_category_edit.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Edition script for sessions categories.
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -105,131 +103,131 @@ if (!empty($return)) {
                 <div class="col-sm-6">
                     <select name="day_start">
                         <option value="1">01</option>
-                        <option value="2" <?php if ($day_start == 2) {
+                        <option value="2" <?php if (2 == $day_start) {
     echo 'selected="selected"';
 } ?> >02</option>
-                        <option value="3" <?php if ($day_start == 3) {
+                        <option value="3" <?php if (3 == $day_start) {
     echo 'selected="selected"';
 } ?> >03</option>
-                        <option value="4" <?php if ($day_start == 4) {
+                        <option value="4" <?php if (4 == $day_start) {
     echo 'selected="selected"';
 } ?> >04</option>
-                        <option value="5" <?php if ($day_start == 5) {
+                        <option value="5" <?php if (5 == $day_start) {
     echo 'selected="selected"';
 } ?> >05</option>
-                        <option value="6" <?php if ($day_start == 6) {
+                        <option value="6" <?php if (6 == $day_start) {
     echo 'selected="selected"';
 } ?> >06</option>
-                        <option value="7" <?php if ($day_start == 7) {
+                        <option value="7" <?php if (7 == $day_start) {
     echo 'selected="selected"';
 } ?> >07</option>
-                        <option value="8" <?php if ($day_start == 8) {
+                        <option value="8" <?php if (8 == $day_start) {
     echo 'selected="selected"';
 } ?> >08</option>
-                        <option value="9" <?php if ($day_start == 9) {
+                        <option value="9" <?php if (9 == $day_start) {
     echo 'selected="selected"';
 } ?> >09</option>
-                        <option value="10" <?php if ($day_start == 10) {
+                        <option value="10" <?php if (10 == $day_start) {
     echo 'selected="selected"';
 } ?> >10</option>
-                        <option value="11" <?php if ($day_start == 11) {
+                        <option value="11" <?php if (11 == $day_start) {
     echo 'selected="selected"';
 } ?> >11</option>
-                        <option value="12" <?php if ($day_start == 12) {
+                        <option value="12" <?php if (12 == $day_start) {
     echo 'selected="selected"';
 } ?> >12</option>
-                        <option value="13" <?php if ($day_start == 13) {
+                        <option value="13" <?php if (13 == $day_start) {
     echo 'selected="selected"';
 } ?> >13</option>
-                        <option value="14" <?php if ($day_start == 14) {
+                        <option value="14" <?php if (14 == $day_start) {
     echo 'selected="selected"';
 } ?> >14</option>
-                        <option value="15" <?php if ($day_start == 15) {
+                        <option value="15" <?php if (15 == $day_start) {
     echo 'selected="selected"';
 } ?> >15</option>
-                        <option value="16" <?php if ($day_start == 16) {
+                        <option value="16" <?php if (16 == $day_start) {
     echo 'selected="selected"';
 } ?> >16</option>
-                        <option value="17" <?php if ($day_start == 17) {
+                        <option value="17" <?php if (17 == $day_start) {
     echo 'selected="selected"';
 } ?> >17</option>
-                        <option value="18" <?php if ($day_start == 18) {
+                        <option value="18" <?php if (18 == $day_start) {
     echo 'selected="selected"';
 } ?> >18</option>
-                        <option value="19" <?php if ($day_start == 19) {
+                        <option value="19" <?php if (19 == $day_start) {
     echo 'selected="selected"';
 } ?> >19</option>
-                        <option value="20" <?php if ($day_start == 20) {
+                        <option value="20" <?php if (20 == $day_start) {
     echo 'selected="selected"';
 } ?> >20</option>
-                        <option value="21" <?php if ($day_start == 21) {
+                        <option value="21" <?php if (21 == $day_start) {
     echo 'selected="selected"';
 } ?> >21</option>
-                        <option value="22" <?php if ($day_start == 22) {
+                        <option value="22" <?php if (22 == $day_start) {
     echo 'selected="selected"';
 } ?> >22</option>
-                        <option value="23" <?php if ($day_start == 23) {
+                        <option value="23" <?php if (23 == $day_start) {
     echo 'selected="selected"';
 } ?> >23</option>
-                        <option value="24" <?php if ($day_start == 24) {
+                        <option value="24" <?php if (24 == $day_start) {
     echo 'selected="selected"';
 } ?> >24</option>
-                        <option value="25" <?php if ($day_start == 25) {
+                        <option value="25" <?php if (25 == $day_start) {
     echo 'selected="selected"';
 } ?> >25</option>
-                        <option value="26" <?php if ($day_start == 26) {
+                        <option value="26" <?php if (26 == $day_start) {
     echo 'selected="selected"';
 } ?> >26</option>
-                        <option value="27" <?php if ($day_start == 27) {
+                        <option value="27" <?php if (27 == $day_start) {
     echo 'selected="selected"';
 } ?> >27</option>
-                        <option value="28" <?php if ($day_start == 28) {
+                        <option value="28" <?php if (28 == $day_start) {
     echo 'selected="selected"';
 } ?> >28</option>
-                        <option value="29" <?php if ($day_start == 29) {
+                        <option value="29" <?php if (29 == $day_start) {
     echo 'selected="selected"';
 } ?> >29</option>
-                        <option value="30" <?php if ($day_start == 30) {
+                        <option value="30" <?php if (30 == $day_start) {
     echo 'selected="selected"';
 } ?> >30</option>
-                        <option value="31" <?php if ($day_start == 31) {
+                        <option value="31" <?php if (31 == $day_start) {
     echo 'selected="selected"';
 } ?> >31</option>
                   </select>
                   /
                   <select name="month_start">
                         <option value="1">01</option>
-                        <option value="2" <?php if ($month_start == 2) {
+                        <option value="2" <?php if (2 == $month_start) {
     echo 'selected="selected"';
 } ?> >02</option>
-                        <option value="3" <?php if ($month_start == 3) {
+                        <option value="3" <?php if (3 == $month_start) {
     echo 'selected="selected"';
 } ?> >03</option>
-                        <option value="4" <?php if ($month_start == 4) {
+                        <option value="4" <?php if (4 == $month_start) {
     echo 'selected="selected"';
 } ?> >04</option>
-                        <option value="5" <?php if ($month_start == 5) {
+                        <option value="5" <?php if (5 == $month_start) {
     echo 'selected="selected"';
 } ?> >05</option>
-                        <option value="6" <?php if ($month_start == 6) {
+                        <option value="6" <?php if (6 == $month_start) {
     echo 'selected="selected"';
 } ?> >06</option>
-                        <option value="7" <?php if ($month_start == 7) {
+                        <option value="7" <?php if (7 == $month_start) {
     echo 'selected="selected"';
 } ?> >07</option>
-                        <option value="8" <?php if ($month_start == 8) {
+                        <option value="8" <?php if (8 == $month_start) {
     echo 'selected="selected"';
 } ?> >08</option>
-                        <option value="9" <?php if ($month_start == 9) {
+                        <option value="9" <?php if (9 == $month_start) {
     echo 'selected="selected"';
 } ?> >09</option>
-                        <option value="10" <?php if ($month_start == 10) {
+                        <option value="10" <?php if (10 == $month_start) {
     echo 'selected="selected"';
 } ?> >10</option>
-                        <option value="11" <?php if ($month_start == 11) {
+                        <option value="11" <?php if (11 == $month_start) {
     echo 'selected="selected"';
 } ?> >11</option>
-                        <option value="12" <?php if ($month_start == 12) {
+                        <option value="12" <?php if (12 == $month_start) {
     echo 'selected="selected"';
 } ?> >12</option>
                   </select>
@@ -252,137 +250,137 @@ if (!empty($return)) {
                 <div class="col-sm-6">
                     <select name="day_end">
                         <option value="0">--</option>
-                        <option value="1" <?php if ($day_end == 1) {
+                        <option value="1" <?php if (1 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >01</option>
-                        <option value="2" <?php if ($day_end == 2) {
+                        <option value="2" <?php if (2 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >02</option>
-                        <option value="3" <?php if ($day_end == 3) {
+                        <option value="3" <?php if (3 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >03</option>
-                        <option value="4" <?php if ($day_end == 4) {
+                        <option value="4" <?php if (4 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >04</option>
-                        <option value="5" <?php if ($day_end == 5) {
+                        <option value="5" <?php if (5 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >05</option>
-                        <option value="6" <?php if ($day_end == 6) {
+                        <option value="6" <?php if (6 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >06</option>
-                        <option value="7" <?php if ($day_end == 7) {
+                        <option value="7" <?php if (7 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >07</option>
-                        <option value="8" <?php if ($day_end == 8) {
+                        <option value="8" <?php if (8 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >08</option>
-                        <option value="9" <?php if ($day_end == 9) {
+                        <option value="9" <?php if (9 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >09</option>
-                        <option value="10" <?php if ($day_end == 10) {
+                        <option value="10" <?php if (10 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >10</option>
-                        <option value="11" <?php if ($day_end == 11) {
+                        <option value="11" <?php if (11 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >11</option>
-                        <option value="12" <?php if ($day_end == 12) {
+                        <option value="12" <?php if (12 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >12</option>
-                        <option value="13" <?php if ($day_end == 13) {
+                        <option value="13" <?php if (13 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >13</option>
-                        <option value="14" <?php if ($day_end == 14) {
+                        <option value="14" <?php if (14 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >14</option>
-                        <option value="15" <?php if ($day_end == 15) {
+                        <option value="15" <?php if (15 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >15</option>
-                        <option value="16" <?php if ($day_end == 16) {
+                        <option value="16" <?php if (16 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >16</option>
-                        <option value="17" <?php if ($day_end == 17) {
+                        <option value="17" <?php if (17 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >17</option>
-                        <option value="18" <?php if ($day_end == 18) {
+                        <option value="18" <?php if (18 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >18</option>
-                        <option value="19" <?php if ($day_end == 19) {
+                        <option value="19" <?php if (19 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >19</option>
-                        <option value="20" <?php if ($day_end == 20) {
+                        <option value="20" <?php if (20 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >20</option>
-                        <option value="21" <?php if ($day_end == 21) {
+                        <option value="21" <?php if (21 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >21</option>
-                        <option value="22" <?php if ($day_end == 22) {
+                        <option value="22" <?php if (22 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >22</option>
-                        <option value="23" <?php if ($day_end == 23) {
+                        <option value="23" <?php if (23 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >23</option>
-                        <option value="24" <?php if ($day_end == 24) {
+                        <option value="24" <?php if (24 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >24</option>
-                        <option value="25" <?php if ($day_end == 25) {
+                        <option value="25" <?php if (25 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >25</option>
-                        <option value="26" <?php if ($day_end == 26) {
+                        <option value="26" <?php if (26 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >26</option>
-                        <option value="27" <?php if ($day_end == 27) {
+                        <option value="27" <?php if (27 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >27</option>
-                        <option value="28" <?php if ($day_end == 28) {
+                        <option value="28" <?php if (28 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >28</option>
-                        <option value="29" <?php if ($day_end == 29) {
+                        <option value="29" <?php if (29 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >29</option>
-                        <option value="30" <?php if ($day_end == 30) {
+                        <option value="30" <?php if (30 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >30</option>
-                        <option value="31" <?php if ($day_end == 31) {
+                        <option value="31" <?php if (31 == $day_end) {
                             echo 'selected="selected"';
                         } ?> >31</option>
                   </select>
                   /
                   <select name="month_end">
                         <option value="0">--</option>
-                        <option value="1" <?php if ($month_end == 1) {
+                        <option value="1" <?php if (1 == $month_end) {
                             echo 'selected="selected"';
                         } ?> >01</option>
-                        <option value="2" <?php if ($month_end == 2) {
+                        <option value="2" <?php if (2 == $month_end) {
                             echo 'selected="selected"';
                         } ?> >02</option>
-                        <option value="3" <?php if ($month_end == 3) {
+                        <option value="3" <?php if (3 == $month_end) {
                             echo 'selected="selected"';
                         } ?> >03</option>
-                        <option value="4" <?php if ($month_end == 4) {
+                        <option value="4" <?php if (4 == $month_end) {
                             echo 'selected="selected"';
                         } ?> >04</option>
-                        <option value="5" <?php if ($month_end == 5) {
+                        <option value="5" <?php if (5 == $month_end) {
                             echo 'selected="selected"';
                         } ?> >05</option>
-                        <option value="6" <?php if ($month_end == 6) {
+                        <option value="6" <?php if (6 == $month_end) {
                             echo 'selected="selected"';
                         } ?> >06</option>
-                        <option value="7" <?php if ($month_end == 7) {
+                        <option value="7" <?php if (7 == $month_end) {
                             echo 'selected="selected"';
                         } ?> >07</option>
-                        <option value="8" <?php if ($month_end == 8) {
+                        <option value="8" <?php if (8 == $month_end) {
                             echo 'selected="selected"';
                         } ?> >08</option>
-                        <option value="9" <?php if ($month_end == 9) {
+                        <option value="9" <?php if (9 == $month_end) {
                             echo 'selected="selected"';
                         } ?> >09</option>
-                        <option value="10" <?php if ($month_end == 10) {
+                        <option value="10" <?php if (10 == $month_end) {
                             echo 'selected="selected"';
                         } ?> >10</option>
-                        <option value="11" <?php if ($month_end == 11) {
+                        <option value="11" <?php if (11 == $month_end) {
                             echo 'selected="selected"';
                         } ?> >11</option>
-                        <option value="12" <?php if ($month_end == 12) {
+                        <option value="12" <?php if (12 == $month_end) {
                             echo 'selected="selected"';
                         } ?> >12</option>
                   </select>
@@ -415,7 +413,7 @@ if (!empty($return)) {
 
 
 <script>
-<?php if ($year_start == "0000") {
+<?php if ("0000" == $year_start) {
                             echo "setDisable(document.form.nolimit);\r\n";
                         } ?>
 function setDisable(select){
diff --git a/public/main/session/session_category_list.php b/public/main/session/session_category_list.php
index cbaa5512b9..d7ae235bc1 100644
--- a/public/main/session/session_category_list.php
+++ b/public/main/session/session_category_list.php
@@ -35,8 +35,8 @@ $idChecked = isset($_REQUEST['idChecked']) ? Security::remove_XSS($_REQUEST['idC
 $order = isset($_REQUEST['order']) ? Security::remove_XSS($_REQUEST['order']) : 'ASC';
 $keyword = isset($_REQUEST['keyword']) ? Security::remove_XSS($_REQUEST['keyword']) : null;
 
-if ($action === 'delete_on_session' || $action === 'delete_off_session') {
-    $delete_session = $action == 'delete_on_session' ? true : false;
+if ('delete_on_session' === $action || 'delete_off_session' === $action) {
+    $delete_session = 'delete_on_session' == $action ? true : false;
     SessionManager::delete_session_category($idChecked, $delete_session);
     Display::addFlash(Display::return_message(get_lang('The selected categories have been deleted')));
     header('Location: '.api_get_self().'?sort='.$sort);
@@ -45,7 +45,7 @@ if ($action === 'delete_on_session' || $action === 'delete_off_session') {
 
 $interbreadcrumb[] = ['url' => 'session_list.php', 'name' => get_lang('Session list')];
 
-if (isset($_GET['search']) && $_GET['search'] === 'advanced') {
+if (isset($_GET['search']) && 'advanced' === $_GET['search']) {
     $interbreadcrumb[] = ['url' => 'session_category_list.php', 'name' => get_lang('Sessions categories list')];
     $tool_name = get_lang('Find a training session');
     Display::display_header($tool_name);
@@ -92,7 +92,7 @@ if (isset($_GET['search']) && $_GET['search'] === 'advanced') {
 
     $query_rows = "SELECT count(*) as total_rows
                   FROM $tbl_session_category sc $where ";
-    $order = ($order == 'ASC') ? 'DESC' : 'ASC';
+    $order = ('ASC' == $order) ? 'DESC' : 'ASC';
     $result_rows = Database::query($query_rows);
     $recorset = Database::fetch_array($result_rows);
     $num = $recorset['total_rows'];
@@ -133,7 +133,7 @@ if (isset($_GET['search']) && $_GET['search'] === 'advanced') {
     <form method="post" action="<?php echo api_get_self(); ?>?action=delete&sort=<?php echo $sort; ?>"
           onsubmit="if(!confirm('<?php echo get_lang('Please confirm your choice'); ?>')) return false;">
         <?php
-        if (count($Sessions) == 0 && isset($_POST['keyword'])) {
+        if (0 == count($Sessions) && isset($_POST['keyword'])) {
             echo Display::return_message(get_lang('No search results'), 'warning');
         } else {
             if ($num > $limit) {
@@ -173,13 +173,13 @@ if (isset($_GET['search']) && $_GET['search'] === 'advanced') {
             <table class="data_table" width="100%">
                 <tr>
                     <th>&nbsp;</th>
-                    <th><a href="<?php echo api_get_self(); ?>?sort=name&order=<?php echo ($sort == 'name') ? $order
+                    <th><a href="<?php echo api_get_self(); ?>?sort=name&order=<?php echo ('name' == $sort) ? $order
                             : 'ASC'; ?>"><?php echo get_lang('Category name'); ?></a></th>
-                    <th><a href="<?php echo api_get_self(); ?>?sort=nbr_session&order=<?php echo ($sort
-                            == 'nbr_session') ? $order : 'ASC'; ?>"><?php echo get_lang('Number sessions'); ?></a></th>
-                    <th><a href="<?php echo api_get_self(); ?>?sort=date_start&order=<?php echo ($sort == 'date_start')
+                    <th><a href="<?php echo api_get_self(); ?>?sort=nbr_session&order=<?php echo ('nbr_session'
+                            == $sort) ? $order : 'ASC'; ?>"><?php echo get_lang('Number sessions'); ?></a></th>
+                    <th><a href="<?php echo api_get_self(); ?>?sort=date_start&order=<?php echo ('date_start' == $sort)
                             ? $order : 'ASC'; ?>"><?php echo get_lang('Start Date'); ?></a></th>
-                    <th><a href="<?php echo api_get_self(); ?>?sort=date_end&order=<?php echo ($sort == 'date_end')
+                    <th><a href="<?php echo api_get_self(); ?>?sort=date_end&order=<?php echo ('date_end' == $sort)
                             ? $order : 'ASC'; ?>"><?php echo get_lang('End Date'); ?></a></th>
                     <th><?php echo get_lang('Detail'); ?></th>
                 </tr>
@@ -210,7 +210,7 @@ if (isset($_GET['search']) && $_GET['search'] === 'advanced') {
                         <td><?php echo api_format_date($enreg['date_start'], DATE_FORMAT_SHORT); ?></td>
                         <td>
                             <?php
-                            if (!empty($enreg['date_end']) && $enreg['date_end'] != '0000-00-00') {
+                            if (!empty($enreg['date_end']) && '0000-00-00' != $enreg['date_end']) {
                                 echo api_format_date($enreg['date_end'], DATE_FORMAT_SHORT);
                             } else {
                                 echo '-';
diff --git a/public/main/session/session_course_edit.php b/public/main/session/session_course_edit.php
index 988aa04f95..b06a22b0b6 100644
--- a/public/main/session/session_course_edit.php
+++ b/public/main/session/session_course_edit.php
@@ -3,8 +3,6 @@
 
 /**
  * Implements the edition of course-session settings.
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 
diff --git a/public/main/session/session_course_list.php b/public/main/session/session_course_list.php
index 9a02e236a1..0f22bb49bd 100644
--- a/public/main/session/session_course_list.php
+++ b/public/main/session/session_course_list.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- *	@package chamilo.admin
- */
+
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
@@ -34,7 +32,7 @@ if (!list($session_name) = Database::fetch_row($result)) {
     exit;
 }
 
-if ($action == 'delete') {
+if ('delete' == $action) {
     $idChecked = $_REQUEST['idChecked'];
     if (is_array($idChecked) && count($idChecked) > 0) {
         $my_temp = [];
diff --git a/public/main/session/session_course_user.php b/public/main/session/session_course_user.php
index 0537aa8b06..d555980806 100644
--- a/public/main/session/session_course_user.php
+++ b/public/main/session/session_course_user.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- *	@package chamilo.admin
- */
+
 use Chamilo\CoreBundle\Entity\Course;
 use Chamilo\CoreBundle\Entity\Session;
 
diff --git a/public/main/session/session_course_user_list.php b/public/main/session/session_course_user_list.php
index 328aa295e2..bd45903ee3 100644
--- a/public/main/session/session_course_user_list.php
+++ b/public/main/session/session_course_user_list.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.admin
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
@@ -97,7 +94,7 @@ $sql = "
     ORDER BY $sort $direction
     LIMIT $from,".($limit + 1);
 
-if ($direction == 'desc') {
+if ('desc' == $direction) {
     $direction = 'asc';
 } else {
     $direction = 'desc';
diff --git a/public/main/session/session_edit.php b/public/main/session/session_edit.php
index 634178b476..d0fcbda5ba 100644
--- a/public/main/session/session_edit.php
+++ b/public/main/session/session_edit.php
@@ -3,8 +3,6 @@
 
 /**
  * Sessions edition script.
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -70,7 +68,7 @@ $sql = "SELECT user_id,lastname,firstname,username
 if (api_is_multiple_url_enabled()) {
     $table_access_url_rel_user = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
     $access_url_id = api_get_current_access_url_id();
-    if ($access_url_id != -1) {
+    if (-1 != $access_url_id) {
         $sql = "SELECT DISTINCT u.user_id,lastname,firstname,username
                 FROM $tbl_user u
                 INNER JOIN $table_access_url_rel_user url_rel_user
@@ -96,7 +94,7 @@ $categoriesOption = [
     '0' => get_lang('none'),
 ];
 
-if ($categoriesList != false) {
+if (false != $categoriesList) {
     foreach ($categoriesList as $categoryItem) {
         $categoriesOption[$categoryItem['id']] = $categoryItem['name'];
     }
@@ -149,7 +147,7 @@ if ($form->validate()) {
     $id_session_category = $params['session_category'];
     $id_visibility = $params['session_visibility'];
     $duration = isset($params['duration']) ? $params['duration'] : null;
-    if ($params['access'] == 1) {
+    if (1 == $params['access']) {
         $duration = null;
     }
 
@@ -160,7 +158,7 @@ if ($form->validate()) {
 
     $extraFields = [];
     foreach ($params as $key => $value) {
-        if (strpos($key, 'extra_') === 0) {
+        if (0 === strpos($key, 'extra_')) {
             $extraFields[$key] = $value;
         }
     }
diff --git a/public/main/session/session_export.php b/public/main/session/session_export.php
index 82daf9ef97..b6a8652f4f 100644
--- a/public/main/session/session_export.php
+++ b/public/main/session/session_export.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.admin
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
@@ -55,7 +52,7 @@ if (isset($_POST['formSent'])) {
         if (api_is_multiple_url_enabled()) {
             $tbl_session_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql = "SELECT s.id, name,id_coach,username,access_start_date,access_end_date,visibility,session_category_id
                     FROM $tbl_session s
                     INNER JOIN $tbl_session_rel_access_url as session_rel_url
@@ -277,7 +274,7 @@ $sql = "SELECT id, name FROM $tbl_session ORDER BY name";
 if (api_is_multiple_url_enabled()) {
     $tbl_session_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
     $access_url_id = api_get_current_access_url_id();
-    if ($access_url_id != -1) {
+    if (-1 != $access_url_id) {
         $sql = "SELECT s.id, name FROM $tbl_session s
                 INNER JOIN $tbl_session_rel_access_url as session_rel_url
                 ON (s.id = session_rel_url.session_id)
diff --git a/public/main/session/session_import.php b/public/main/session/session_import.php
index 06b113f02c..69ca9dda03 100644
--- a/public/main/session/session_import.php
+++ b/public/main/session/session_import.php
@@ -44,7 +44,7 @@ if (isset($_POST['formSent']) && $_POST['formSent']) {
         $sessions = [];
         $session_counter = 0;
 
-        if ($file_type == 'xml') {
+        if ('xml' == $file_type) {
             // XML
             // SimpleXML for PHP5 deals with various encodings, but how many they are, what are version issues, do we need to waste time with configuration options?
             // For avoiding complications we go some sort of "PHP4 way" - we convert the input xml-file into UTF-8 before passing it to the parser.
@@ -190,7 +190,7 @@ if (isset($_POST['formSent']) && $_POST['formSent']) {
 
                         if (!empty($coach)) {
                             $coach_id = UserManager::get_user_id_from_username($coach);
-                            if ($coach_id === false) {
+                            if (false === $coach_id) {
                                 $error_message .= get_lang('This user doesn\'t exist').' : '.$coach.'<br />';
                                 // Forcing the coach id if user does not exist.
                                 $coach_id = api_get_user_id();
@@ -265,7 +265,7 @@ if (isset($_POST['formSent']) && $_POST['formSent']) {
                         } else {
                             // Update the session if it is needed.
                             $my_session_result = SessionManager::get_session_by_name($session_name);
-                            if ($my_session_result === false) {
+                            if (false === $my_session_result) {
                                 // Creating the session.
                                 $sql_session = "INSERT IGNORE INTO $tbl_session SET
                                         name = '".Database::escape_string($session_name)."',
@@ -309,7 +309,7 @@ if (isset($_POST['formSent']) && $_POST['formSent']) {
                         foreach ($node_session->User as $node_user) {
                             $username = UserManager::purify_username(api_utf8_decode($node_user), $purification_option_for_usernames);
                             $user_id = UserManager::get_user_id_from_username($username);
-                            if ($user_id !== false) {
+                            if (false !== $user_id) {
                                 $sql = "INSERT IGNORE INTO $tbl_session_user SET
                                         user_id ='$user_id',
                                         session_id = '$session_id',
@@ -343,7 +343,7 @@ if (isset($_POST['formSent']) && $_POST['formSent']) {
                                 foreach ($course_coaches as $course_coach) {
                                     $coach_id = UserManager::purify_username(api_utf8_decode($course_coach), $purification_option_for_usernames);
                                     $coach_id = UserManager::get_user_id_from_username($course_coach);
-                                    if ($coach_id !== false) {
+                                    if (false !== $coach_id) {
                                         $sql = "INSERT IGNORE INTO $tbl_session_course_user SET
                                                 user_id='$coach_id',
                                                 c_id = '$courseId',
@@ -361,7 +361,7 @@ if (isset($_POST['formSent']) && $_POST['formSent']) {
                                 foreach ($node_course->User as $node_user) {
                                     $username = UserManager::purify_username(api_utf8_decode($node_user), $purification_option_for_usernames);
                                     $user_id = UserManager::get_user_id_from_username($username);
-                                    if ($user_id !== false) {
+                                    if (false !== $user_id) {
                                         // Adding to session_rel_user table.
                                         $sql = "INSERT IGNORE INTO $tbl_session_user SET
                                                 user_id ='$user_id',
@@ -432,8 +432,8 @@ if (isset($_POST['formSent']) && $_POST['formSent']) {
             }
             $warn = substr($warn, 0, -1);
         }
-        if ($session_counter == 1) {
-            if ($file_type == 'csv') {
+        if (1 == $session_counter) {
+            if ('csv' == $file_type) {
                 $session_id = current($sessionList);
             }
             Display::addFlash(Display::return_message($warn));
diff --git a/public/main/session/session_import_drh.php b/public/main/session/session_import_drh.php
index a6ee7015b4..b4af8ecf63 100644
--- a/public/main/session/session_import_drh.php
+++ b/public/main/session/session_import_drh.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.admin
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/session/session_list.php b/public/main/session/session_list.php
index 1b2ff6909f..682bb171b4 100644
--- a/public/main/session/session_list.php
+++ b/public/main/session/session_list.php
@@ -3,8 +3,6 @@
 
 /**
  * List sessions in an efficient and usable way.
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 
@@ -20,7 +18,7 @@ $action = isset($_REQUEST['action']) ? $_REQUEST['action'] : null;
 $idChecked = isset($_REQUEST['idChecked']) ? $_REQUEST['idChecked'] : null;
 $list_type = isset($_REQUEST['list_type']) ? $_REQUEST['list_type'] : 'simple';
 
-if ($action == 'delete') {
+if ('delete' == $action) {
     $sessionInfo = api_get_session_info($idChecked);
     if ($sessionInfo) {
         $response = SessionManager::delete($idChecked);
@@ -32,7 +30,7 @@ if ($action == 'delete') {
     }
     header('Location: session_list.php');
     exit();
-} elseif ($action == 'copy') {
+} elseif ('copy' == $action) {
     $result = SessionManager::copy($idChecked);
     if ($result) {
         Display::addFlash(Display::return_message(get_lang('Item copied')));
@@ -310,7 +308,7 @@ $orderUrl = api_get_path(WEB_AJAX_PATH).'session.ajax.php?a=order';
 
             <?php
             // Create the searching dialog.
-            if ($hideSearch !== true) {
+            if (true !== $hideSearch) {
                 echo 'grid.searchGrid(prmSearch);';
             }
             ?>
@@ -351,7 +349,7 @@ if (api_is_platform_admin()) {
         Display::return_icon('folder.png', get_lang('Sessions categories list'), '', ICON_SIZE_MEDIUM).'</a>';
 }
 
-if ($list_type == 'complete') {
+if ('complete' == $list_type) {
     echo '<a href="'.api_get_self().'?list_type=simple">'.
         Display::return_icon('view_remove.png', get_lang('Simple'), '', ICON_SIZE_MEDIUM).'</a>';
 } else {
diff --git a/public/main/session/session_user_edit.php b/public/main/session/session_user_edit.php
index 336ddf7465..744044c075 100644
--- a/public/main/session/session_user_edit.php
+++ b/public/main/session/session_user_edit.php
@@ -43,7 +43,7 @@ $userAccess = CourseManager::getFirstCourseAccessPerSessionAndUser(
     $userId
 );
 
-if (count($userAccess) == 0) {
+if (0 == count($userAccess)) {
     // User never accessed the session. End date is still open
     $msg = sprintf(get_lang('This user never accessed this session before. The duration is currently set to %s days (from the first access date)'), $sessionInfo['duration']);
 } else {
@@ -78,7 +78,7 @@ $message = null;
 if ($form->validate()) {
     $duration = $form->getSubmitValue('duration');
     // Only update if the duration is different from the default duration
-    if ($duration != 0) {
+    if (0 != $duration) {
         SessionManager::editUserSessionDuration($duration, $userId, $sessionId);
         $message = Display::return_message(get_lang('Item updated'), 'confirmation');
     } else {
diff --git a/public/main/session/session_user_import.php b/public/main/session/session_user_import.php
index 4c07f94612..e4f603ff8a 100644
--- a/public/main/session/session_user_import.php
+++ b/public/main/session/session_user_import.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.admin
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/social/download.php b/public/main/social/download.php
index d933f3300c..baa0876a21 100644
--- a/public/main/social/download.php
+++ b/public/main/social/download.php
@@ -6,8 +6,6 @@
  * Html files are parsed to fix a few problems with URLs,
  * but this code will hopefully be replaced soon by an Apache URL
  * rewrite mechanism.
- *
- * @package chamilo.messages
  */
 session_cache_limiter('public');
 
@@ -61,7 +59,7 @@ if (Security::check_abs_path($file, $dir.'message_attachments/')) {
         false,
         $title
     );
-    if ($result === false) {
+    if (false === $result) {
         api_not_allowed(true);
     }
 }
diff --git a/public/main/social/download_my_files.php b/public/main/social/download_my_files.php
index 6123fa418a..9c55425c9c 100644
--- a/public/main/social/download_my_files.php
+++ b/public/main/social/download_my_files.php
@@ -24,7 +24,7 @@ if ($config) {
 
 if (Security::check_abs_path($file, $dir.'my_files/')) {
     $result = DocumentManager::file_send_for_download($file);
-    if ($result === false) {
+    if (false === $result) {
         exit;
     }
 }
diff --git a/public/main/social/friends.php b/public/main/social/friends.php
index 75721f7b72..e078ae95b9 100644
--- a/public/main/social/friends.php
+++ b/public/main/social/friends.php
@@ -8,7 +8,7 @@ $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
-if (api_get_setting('allow_social_tool') != 'true') {
+if ('true' != api_get_setting('allow_social_tool')) {
     api_not_allowed();
 }
 
@@ -73,7 +73,7 @@ $user_id = api_get_user_id();
 $name_search = isset($_POST['search_name_q']) ? $_POST['search_name_q'] : null;
 $number_friends = 0;
 
-if (isset($name_search) && $name_search != 'undefined') {
+if (isset($name_search) && 'undefined' != $name_search) {
     $friends = SocialManager::get_friends($user_id, USER_RELATION_TYPE_FRIEND, $name_search);
 } else {
     $friends = SocialManager::get_friends($user_id, USER_RELATION_TYPE_FRIEND);
@@ -81,7 +81,7 @@ if (isset($name_search) && $name_search != 'undefined') {
 
 $social_right_content = '<div class="col-md-12">';
 
-if (count($friends) == 0) {
+if (0 == count($friends)) {
     $social_right_content .= Display::return_message(
         Display::tag('p', get_lang('No friends in your contact list')),
         'warning',
diff --git a/public/main/social/group_add.php b/public/main/social/group_add.php
index c2ebc306ef..877febd739 100644
--- a/public/main/social/group_add.php
+++ b/public/main/social/group_add.php
@@ -2,19 +2,17 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.social
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
-if (api_get_setting('allow_social_tool') !== 'true') {
+if ('true' !== api_get_setting('allow_social_tool')) {
     api_not_allowed(true);
 }
 
-if (api_get_setting('allow_students_to_create_groups_in_social') === 'false' && !api_is_allowed_to_edit()) {
+if ('false' === api_get_setting('allow_students_to_create_groups_in_social') && !api_is_allowed_to_edit()) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/social/group_edit.php b/public/main/social/group_edit.php
index cf6986ec45..4b8f325832 100644
--- a/public/main/social/group_edit.php
+++ b/public/main/social/group_edit.php
@@ -2,15 +2,13 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.social
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
-if (api_get_setting('allow_social_tool') !== 'true') {
+if ('true' !== api_get_setting('allow_social_tool')) {
     api_not_allowed();
 }
 
diff --git a/public/main/social/group_invitation.php b/public/main/social/group_invitation.php
index 24b01347af..8b78049165 100644
--- a/public/main/social/group_invitation.php
+++ b/public/main/social/group_invitation.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.social
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 
@@ -60,7 +58,7 @@ if (isset($_POST['form_sent']) && $_POST['form_sent']) {
         $user_list = [];
     }
 
-    if ($form_sent == 1) {
+    if (1 == $form_sent) {
         // invite this users
         $result = $usergroup->add_users_to_groups(
             $user_list,
@@ -111,7 +109,7 @@ if (!$friends) {
 
             if (!isset($group_friend_list[$group_id]) ||
                 isset($group_friend_list[$group_id]) &&
-                $group_friend_list[$group_id]['relation_type'] == '') {
+                '' == $group_friend_list[$group_id]['relation_type']) {
                 $Users[$friend['friend_user_id']] = [
                     'user_id' => $friend['friend_user_id'],
                     'firstname' => $friend['firstName'],
@@ -146,9 +144,9 @@ if (is_array($Users) && count($Users) > 0) {
 $social_left_content = SocialManager::show_social_menu('invite_friends', $group_id);
 $social_right_content = '<h3 class="group-title">'.Security::remove_XSS($group_info['name'], STUDENT, true).'</h3>';
 
-if (count($nosessionUsersList) == 0) {
+if (0 == count($nosessionUsersList)) {
     $friends = SocialManager::get_friends(api_get_user_id());
-    if ($friends == 0) {
+    if (0 == $friends) {
         $social_right_content .= Display::return_message(get_lang('You need to have friends in your social network'), 'warning');
     } else {
         $social_right_content .= Display::return_message(get_lang('You already invite all your contacts'), 'info');
diff --git a/public/main/social/group_members.php b/public/main/social/group_members.php
index 0a67a23620..8bb72200f3 100644
--- a/public/main/social/group_members.php
+++ b/public/main/social/group_members.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.social
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
@@ -11,7 +9,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
 
-if (api_get_setting('allow_social_tool') != 'true') {
+if ('true' != api_get_setting('allow_social_tool')) {
     api_not_allowed(true);
 }
 
@@ -51,7 +49,7 @@ $interbreadcrumb[] = ['url' => 'group_view.php?id='.$group_id, 'name' => $group_
 $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Members list')];
 
 //if i'm a moderator
-if (isset($_GET['action']) && $_GET['action'] == 'add') {
+if (isset($_GET['action']) && 'add' == $_GET['action']) {
     // we add a user only if is a open group
     $user_join = intval($_GET['u']);
     //if i'm a moderator
@@ -61,7 +59,7 @@ if (isset($_GET['action']) && $_GET['action'] == 'add') {
     }
 }
 
-if (isset($_GET['action']) && $_GET['action'] == 'delete') {
+if (isset($_GET['action']) && 'delete' == $_GET['action']) {
     // we add a user only if is a open group
     $user_join = intval($_GET['u']);
     //if i'm a moderator
@@ -71,7 +69,7 @@ if (isset($_GET['action']) && $_GET['action'] == 'delete') {
     }
 }
 
-if (isset($_GET['action']) && $_GET['action'] == 'set_moderator') {
+if (isset($_GET['action']) && 'set_moderator' == $_GET['action']) {
     // we add a user only if is a open group
     $user_moderator = intval($_GET['u']);
     //if i'm the admin
@@ -85,7 +83,7 @@ if (isset($_GET['action']) && $_GET['action'] == 'set_moderator') {
     }
 }
 
-if (isset($_GET['action']) && $_GET['action'] == 'delete_moderator') {
+if (isset($_GET['action']) && 'delete_moderator' == $_GET['action']) {
     // we add a user only if is a open group
     $user_moderator = intval($_GET['u']);
     //only group admins can do that
@@ -161,7 +159,7 @@ foreach ($users as $user) {
                 get_lang('Moderator')
             );
             //only group admin can manage moderators
-            if ($user_role == GROUP_USER_PERMISSION_ADMIN) {
+            if (GROUP_USER_PERMISSION_ADMIN == $user_role) {
                 $user['link'] .= '<a href="group_members.php?id='.$group_id.'&u='.$user['id'].'&action=delete_moderator">'.
                     Display::return_icon(
                         'social_moderator_delete.png',
diff --git a/public/main/social/group_topics.php b/public/main/social/group_topics.php
index ec8ac1e8eb..d0bca5e491 100644
--- a/public/main/social/group_topics.php
+++ b/public/main/social/group_topics.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.social
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
@@ -11,7 +9,7 @@ $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
-if (api_get_setting('allow_social_tool') != 'true') {
+if ('true' != api_get_setting('allow_social_tool')) {
     api_not_allowed(true);
 }
 
@@ -33,12 +31,12 @@ if (empty($group_id)) {
     }
     $is_member = $usergroup->is_group_member($group_id);
 
-    if ($group_info['visibility'] == GROUP_PERMISSION_CLOSED && !$is_member) {
+    if (GROUP_PERMISSION_CLOSED == $group_info['visibility'] && !$is_member) {
         api_not_allowed(true);
     }
 }
 
-if (isset($_REQUEST['action']) && $_REQUEST['action'] == 'delete') {
+if (isset($_REQUEST['action']) && 'delete' == $_REQUEST['action']) {
     $group_role = $usergroup->get_user_group_role(api_get_user_id(), $group_id);
 
     if (api_is_platform_admin() ||
@@ -64,11 +62,11 @@ if (isset($_POST['action'])) {
     $group_id = intval($_POST['group_id']);
     $parent_id = intval($_POST['parent_id']);
 
-    if ($_POST['action'] == 'reply_message_group') {
+    if ('reply_message_group' == $_POST['action']) {
         $title = cut($content, 50);
     }
 
-    if ($_POST['action'] == 'edit_message_group') {
+    if ('edit_message_group' == $_POST['action']) {
         $edit_message_id = intval($_POST['message_id']);
         $res = MessageManager::send_message(
             0,
@@ -83,7 +81,7 @@ if (isset($_POST['action'])) {
             $topic_id
         );
     } else {
-        if ($_POST['action'] == 'add_message_group' && !$is_member) {
+        if ('add_message_group' == $_POST['action'] && !$is_member) {
             api_not_allowed(true);
         }
         $res = MessageManager::send_message(
@@ -104,7 +102,7 @@ if (isset($_POST['action'])) {
         Display::addFlash(Display::return_message(get_lang('Error'), 'error'));
     }
     $topic_id = isset($_GET['topic_id']) ? intval($_GET['topic_id']) : null;
-    if ($_POST['action'] == 'add_message_group') {
+    if ('add_message_group' == $_POST['action']) {
         $topic_id = $res;
     }
     $message_id = $res;
diff --git a/public/main/social/group_view.php b/public/main/social/group_view.php
index 92df897bb9..d47bbbb7f5 100644
--- a/public/main/social/group_view.php
+++ b/public/main/social/group_view.php
@@ -10,7 +10,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
 
-if (api_get_setting('allow_social_tool') !== 'true') {
+if ('true' !== api_get_setting('allow_social_tool')) {
     api_not_allowed();
 }
 
@@ -82,10 +82,10 @@ $allowed_views = ['mygroups', 'newest', 'pop'];
 $content = null;
 
 if (isset($_GET['view']) && in_array($_GET['view'], $allowed_views)) {
-    if ($_GET['view'] == 'mygroups') {
+    if ('mygroups' == $_GET['view']) {
         $interbreadcrumb[] = ['url' => 'groups.php', 'name' => get_lang('Groups')];
         $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('My groups')];
-    } elseif ($_GET['view'] == 'newest') {
+    } elseif ('newest' == $_GET['view']) {
         $interbreadcrumb[] = ['url' => 'groups.php', 'name' => get_lang('Groups')];
         $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Newest')];
     } else {
@@ -108,13 +108,13 @@ $role = 0;
 
 $usergroup = new UserGroup();
 
-if ($group_id != 0) {
+if (0 != $group_id) {
     $groupInfo = $usergroup->get($group_id);
     $groupInfo['name'] = Security::remove_XSS($groupInfo['name']);
     $groupInfo['description'] = Security::remove_XSS($groupInfo['description']);
     $interbreadcrumb[] = ['url' => '#', 'name' => $groupInfo['name']];
 
-    if (isset($_GET['action']) && $_GET['action'] == 'leave') {
+    if (isset($_GET['action']) && 'leave' == $_GET['action']) {
         $user_leaved = intval($_GET['u']);
         // I can "leave me myself"
         if (api_get_user_id() == $user_leaved) {
@@ -128,11 +128,11 @@ if ($group_id != 0) {
     }
 
     // add a user to a group if its open
-    if (isset($_GET['action']) && $_GET['action'] == 'join') {
+    if (isset($_GET['action']) && 'join' == $_GET['action']) {
         // we add a user only if is a open group
         $user_join = intval($_GET['u']);
         if (api_get_user_id() == $user_join && !empty($group_id)) {
-            if ($groupInfo['visibility'] == GROUP_PERMISSION_OPEN) {
+            if (GROUP_PERMISSION_OPEN == $groupInfo['visibility']) {
                 $usergroup->add_user_to_group($user_join, $group_id);
                 Display::addFlash(
                     Display::return_message(get_lang('User is subscribed to this group'), 'confirmation', false)
@@ -159,20 +159,20 @@ $groupInfo['name'] = Security::remove_XSS($groupInfo['name']);
 $groupInfo['description'] = Security::remove_XSS($groupInfo['description']);
 
 //Loading group information
-if (isset($_GET['status']) && $_GET['status'] === 'sent') {
+if (isset($_GET['status']) && 'sent' === $_GET['status']) {
     $social_right_content .= Display::return_message(get_lang('Your message has been sent.'), 'confirmation', false);
 }
 
 $is_group_member = $usergroup->is_group_member($group_id);
 $role = $usergroup->get_user_group_role(api_get_user_id(), $group_id);
 
-if (!$is_group_member && $groupInfo['visibility'] == GROUP_PERMISSION_CLOSED) {
-    if ($role == GROUP_USER_PERMISSION_PENDING_INVITATION_SENT_BY_USER) {
+if (!$is_group_member && GROUP_PERMISSION_CLOSED == $groupInfo['visibility']) {
+    if (GROUP_USER_PERMISSION_PENDING_INVITATION_SENT_BY_USER == $role) {
         $social_right_content .= Display::return_message(get_lang('You already sent an invitation'));
     }
 }
 
-if ($is_group_member || $groupInfo['visibility'] == GROUP_PERMISSION_OPEN) {
+if ($is_group_member || GROUP_PERMISSION_OPEN == $groupInfo['visibility']) {
     if (!$is_group_member) {
         if (!in_array(
             $role,
@@ -184,7 +184,7 @@ if ($is_group_member || $groupInfo['visibility'] == GROUP_PERMISSION_OPEN) {
                 get_lang('Join group').'</a>';
             $social_right_content .= '</div>';
             $social_right_content .= '</div>';
-        } elseif ($role == GROUP_USER_PERMISSION_PENDING_INVITATION) {
+        } elseif (GROUP_USER_PERMISSION_PENDING_INVITATION == $role) {
             $social_right_content .= '<div class="group-tool">';
             $social_right_content .= '<div class="pull-right">';
             $social_right_content .= '<a class="btn btn-default btn-sm" href="group_view.php?id='.$group_id.'&action=join&u='.api_get_user_id().'">'.
@@ -250,7 +250,7 @@ if ($is_group_member || $groupInfo['visibility'] == GROUP_PERMISSION_OPEN) {
 
     // Members
     if (count($members) > 0) {
-        if ($role == GROUP_USER_PERMISSION_ADMIN) {
+        if (GROUP_USER_PERMISSION_ADMIN == $role) {
             $member_content .= '<div class="group-tool">';
             $member_content .= '<div class="pull-right">';
             $member_content .= Display::url(
@@ -270,9 +270,9 @@ if ($is_group_member || $groupInfo['visibility'] == GROUP_PERMISSION_OPEN) {
                 [GROUP_USER_PERMISSION_ADMIN, GROUP_USER_PERMISSION_READER, GROUP_USER_PERMISSION_MODERATOR]
             )) {
                 //add icons
-                if ($member['relation_type'] == GROUP_USER_PERMISSION_ADMIN) {
+                if (GROUP_USER_PERMISSION_ADMIN == $member['relation_type']) {
                     $icon = Display::return_icon('social_group_admin.png', get_lang('Admin'));
-                } elseif ($member['relation_type'] == GROUP_USER_PERMISSION_MODERATOR) {
+                } elseif (GROUP_USER_PERMISSION_MODERATOR == $member['relation_type']) {
                     $icon = Display::return_icon('social_group_moderator.png', get_lang('Moderator'));
                 } else {
                     $icon = '';
@@ -313,7 +313,7 @@ if ($is_group_member || $groupInfo['visibility'] == GROUP_PERMISSION_OPEN) {
         ]
     )) {
         $social_right_content .= '<a class="btn" href="group_view.php?id='.$group_id.'&action=join&u='.api_get_user_id().'">'.get_lang('Join group').'</a>';
-    } elseif ($role == GROUP_USER_PERMISSION_PENDING_INVITATION) {
+    } elseif (GROUP_USER_PERMISSION_PENDING_INVITATION == $role) {
         $social_right_content .= '<a class="btn" href="group_view.php?id='.$group_id.'&action=join&u='.api_get_user_id().'">'.get_lang('You have been invited to join now').'</a>';
     }
 }
diff --git a/public/main/social/group_waiting_list.php b/public/main/social/group_waiting_list.php
index 4c55f37e53..74f1edfdcd 100644
--- a/public/main/social/group_waiting_list.php
+++ b/public/main/social/group_waiting_list.php
@@ -2,15 +2,13 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.social
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
-if (api_get_setting('allow_social_tool') != 'true') {
+if ('true' != api_get_setting('allow_social_tool')) {
     api_not_allowed();
 }
 
@@ -47,7 +45,7 @@ $admins = $usergroup->get_users_by_group(
 );
 $show_message = '';
 
-if (isset($_GET['action']) && $_GET['action'] == 'accept') {
+if (isset($_GET['action']) && 'accept' == $_GET['action']) {
     // we add a user only if is a open group
     $user_join = intval($_GET['u']);
     //if i'm a moderator
@@ -57,7 +55,7 @@ if (isset($_GET['action']) && $_GET['action'] == 'accept') {
     }
 }
 
-if (isset($_GET['action']) && $_GET['action'] == 'deny') {
+if (isset($_GET['action']) && 'deny' == $_GET['action']) {
     // we add a user only if is a open group
     $user_join = intval($_GET['u']);
     //if i'm a moderator
@@ -67,7 +65,7 @@ if (isset($_GET['action']) && $_GET['action'] == 'deny') {
     }
 }
 
-if (isset($_GET['action']) && $_GET['action'] == 'set_moderator') {
+if (isset($_GET['action']) && 'set_moderator' == $_GET['action']) {
     // we add a user only if is a open group
     $user_moderator = intval($_GET['u']);
     //if i'm the admin
diff --git a/public/main/social/groups.php b/public/main/social/groups.php
index 85094a5180..06077cdfa4 100644
--- a/public/main/social/groups.php
+++ b/public/main/social/groups.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.social
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
@@ -11,7 +9,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
 
-if (api_get_setting('allow_social_tool') !== 'true') {
+if ('true' !== api_get_setting('allow_social_tool')) {
     api_not_allowed();
 }
 $join_url = '';
@@ -21,10 +19,10 @@ $allowed_views = ['mygroups', 'newest', 'pop'];
 $content = null;
 
 if (isset($_GET['view']) && in_array($_GET['view'], $allowed_views)) {
-    if ($_GET['view'] === 'mygroups') {
+    if ('mygroups' === $_GET['view']) {
         $interbreadcrumb[] = ['url' => 'groups.php', 'name' => get_lang('Groups')];
         $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('My groups')];
-    } elseif ($_GET['view'] === 'newest') {
+    } elseif ('newest' === $_GET['view']) {
         $interbreadcrumb[] = ['url' => 'groups.php', 'name' => get_lang('Groups')];
         $interbreadcrumb[] = ['url' => '#', 'name' => get_lang('Newest')];
     } else {
@@ -45,7 +43,7 @@ $usergroup = new UserGroup();
 $create_thread_link = '';
 
 $show_menu = 'browse_groups';
-if (isset($_GET['view']) && $_GET['view'] == 'mygroups') {
+if (isset($_GET['view']) && 'mygroups' == $_GET['view']) {
     $show_menu = $_GET['view'];
 }
 
@@ -64,13 +62,13 @@ if (is_array($results) && count($results) > 0) {
         $my_group_list[] = $id;
         $name = cut($result['name'], GROUP_TITLE_LENGTH, true);
 
-        if ($result['relation_type'] == GROUP_USER_PERMISSION_ADMIN) {
+        if (GROUP_USER_PERMISSION_ADMIN == $result['relation_type']) {
             $name .= ' '.Display::return_icon(
                 'social_group_admin.png',
                 get_lang('Admin'),
                 ['style' => 'vertical-align:middle']
             );
-        } elseif ($result['relation_type'] == GROUP_USER_PERMISSION_MODERATOR) {
+        } elseif (GROUP_USER_PERMISSION_MODERATOR == $result['relation_type']) {
             $name .= ' '.Display::return_icon(
                 'social_group_moderator.png',
                 get_lang('Moderator'),
@@ -92,7 +90,7 @@ if (is_array($results) && count($results) > 0) {
                 1000
             )
         );
-        if ($count_users_group == 1) {
+        if (1 == $count_users_group) {
             $count_users_group = $count_users_group.' '.get_lang('Member');
         } else {
             $count_users_group = $count_users_group.' '.get_lang('Members');
@@ -115,7 +113,7 @@ if (is_array($results) && count($results) > 0) {
         $html .= Display::tag('h5', $url);
         $html .= '</div>';
         $html .= '<div class="members-groups">'.$members.'</div>';
-        if ($result['description'] != '') {
+        if ('' != $result['description']) {
             $html .= '<div class="description-groups">'.cut($result['description'], 100, true).'</div>';
         } else {
             $html .= '';
@@ -147,7 +145,7 @@ foreach ($results as $result) {
             1000
         )
     );
-    if ($count_users_group == 1) {
+    if (1 == $count_users_group) {
         $count_users_group = $count_users_group.' '.get_lang('Member');
     } else {
         $count_users_group = $count_users_group.' '.get_lang('Members');
@@ -168,7 +166,7 @@ foreach ($results as $result) {
     $html .= Display::tag('h5', $url);
     $html .= '</div>';
     $html .= '<div class="members-groups">'.$members.'</div>';
-    if ($result['description'] != '') {
+    if ('' != $result['description']) {
         $html .= '<div class="description-groups">'.cut($result['description'], 100, true).'</div>';
     }
     // Avoiding my groups
@@ -208,7 +206,7 @@ if (is_array($results) && count($results) > 0) {
                 1000
             )
         );
-        if ($count_users_group == 1) {
+        if (1 == $count_users_group) {
             $count_users_group = $count_users_group.' '.get_lang('Member');
         } else {
             $count_users_group = $count_users_group.' '.get_lang('Members');
@@ -228,7 +226,7 @@ if (is_array($results) && count($results) > 0) {
         $html .= Display::tag('h5', $url);
         $html .= '</div>';
         $html .= '<div class="members-groups">'.$members.'</div>';
-        if ($result['description'] != '') {
+        if ('' != $result['description']) {
             $html .= '<div class="description-groups">'.cut($result['description'], 100, true).'</div>';
         } else {
             $html .= '';
@@ -266,7 +264,7 @@ if (isset($_GET['view']) && in_array($_GET['view'], $allowed_views)) {
                     [true, true, true, false]
                 );
             }
-            if (api_get_setting('allow_students_to_create_groups_in_social') == 'true') {
+            if ('true' == api_get_setting('allow_students_to_create_groups_in_social')) {
                 $create_group_item =
                     '<a class="btn btn-default" href="'.api_get_path(WEB_PATH).'main/social/group_add.php">'.
                     get_lang('Create a social group').'</a>';
@@ -320,7 +318,7 @@ if (isset($_GET['view']) && in_array($_GET['view'], $allowed_views)) {
     } else {
         $my_group_content = '<span class="muted">'.get_lang('(none)').'</span>';
     }
-    if (api_get_setting('allow_students_to_create_groups_in_social') == 'true') {
+    if ('true' == api_get_setting('allow_students_to_create_groups_in_social')) {
         $create_group_item =
             '<a class="btn btn-default" href="'.api_get_path(WEB_PATH).'main/social/group_add.php">'.
             get_lang('Create a social group').'</a>';
@@ -374,7 +372,7 @@ $tpl = new Template(null);
 // Block Social Avatar
 SocialManager::setSocialUserBlock($tpl, api_get_user_id(), $show_menu);
 $show_menu = 'browse_groups';
-if (isset($_GET['view']) && $_GET['view'] == 'mygroups') {
+if (isset($_GET['view']) && 'mygroups' == $_GET['view']) {
     $show_menu = $_GET['view'];
 }
 
diff --git a/public/main/social/home.php b/public/main/social/home.php
index 4d713101da..9768cb78eb 100644
--- a/public/main/social/home.php
+++ b/public/main/social/home.php
@@ -4,8 +4,6 @@
 use ChamiloSession as Session;
 
 /**
- * @package chamilo.social
- *
  * @author Julio Montoya <gugli100@gmail.com>
  * @autor Alex Aragon <alex.aragon@beeznest.com> CSS Design and Template
  */
@@ -21,7 +19,7 @@ $show_full_profile = true;
 Session::erase('this_section');
 $this_section = SECTION_SOCIAL;
 
-if (api_get_setting('allow_social_tool') !== 'true') {
+if ('true' !== api_get_setting('allow_social_tool')) {
     $url = api_get_path(WEB_CODE_PATH).'auth/profile.php';
     header('Location: '.$url);
     exit;
diff --git a/public/main/social/index.php b/public/main/social/index.php
index e560e73854..f836144bb5 100644
--- a/public/main/social/index.php
+++ b/public/main/social/index.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Redirect file for social network default page.
- *
- * @package chamilo.social
  */
 header('Location: profile.php');
 exit();
diff --git a/public/main/social/invitations.php b/public/main/social/invitations.php
index 9a92e251f8..706ccbb4ca 100644
--- a/public/main/social/invitations.php
+++ b/public/main/social/invitations.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.social
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
@@ -11,7 +9,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
 
-if (api_get_setting('allow_social_tool') !== 'true') {
+if ('true' !== api_get_setting('allow_social_tool')) {
     api_not_allowed(true);
 }
 
@@ -109,7 +107,7 @@ if (count($_GET) <= 0) {
         </div><br />';
 }
 
-if ($numberLoop != 0) {
+if (0 != $numberLoop) {
     $invitationHtml = '';
     foreach ($list_get_invitation as $invitation) {
         $sender_user_id = $invitation['user_sender_id'];
diff --git a/public/main/social/map.php b/public/main/social/map.php
index 299ce04141..56c803a0e8 100644
--- a/public/main/social/map.php
+++ b/public/main/social/map.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.social
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
@@ -33,7 +31,7 @@ if (empty($infoStage) || empty($infoVille)) {
 }
 
 $gMapsPlugin = GoogleMapsPlugin::create();
-$localization = $gMapsPlugin->get('enable_api') === 'true';
+$localization = 'true' === $gMapsPlugin->get('enable_api');
 
 if ($localization) {
     $apiKey = $gMapsPlugin->get('api_key');
diff --git a/public/main/social/message_for_group_form.inc.php b/public/main/social/message_for_group_form.inc.php
index 017489e161..0d07f9de08 100644
--- a/public/main/social/message_for_group_form.inc.php
+++ b/public/main/social/message_for_group_form.inc.php
@@ -3,14 +3,12 @@
 
 /**
  * Form for group message.
- *
- * @package chamilo.social
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
-if (api_get_setting('allow_social_tool') != 'true') {
+if ('true' != api_get_setting('allow_social_tool')) {
     api_not_allowed();
 }
 
@@ -37,14 +35,14 @@ if (!empty($group_id) && $allowed_action) {
     $group_info = $usergroup->get($group_id);
     $is_member = $usergroup->is_group_member($group_id);
 
-    if ($group_info['visibility'] == GROUP_PERMISSION_CLOSED && !$is_member) {
+    if (GROUP_PERMISSION_CLOSED == $group_info['visibility'] && !$is_member) {
         api_not_allowed(true);
     }
 
     $to_group = $group_info['name'];
     if (!empty($message_id)) {
         $message_info = MessageManager::get_message_by_id($message_id);
-        if ($allowed_action == 'reply_message_group') {
+        if ('reply_message_group' == $allowed_action) {
             $subject = get_lang('Reply').': '.api_xml_http_response_encode($message_info['title']);
         } else {
             $subject = api_xml_http_response_encode($message_info['title']);
@@ -78,11 +76,11 @@ $form->addHidden('token', $tok);
 
 $tpl = new Template(get_lang('Groups'));
 
-if (api_get_setting('allow_message_tool') === 'true') {
+if ('true' === api_get_setting('allow_message_tool')) {
     // Normal message
     $user_info = api_get_user_info($userfriend_id);
     $height = 180;
-    if ($allowed_action === 'add_message_group') {
+    if ('add_message_group' === $allowed_action) {
         $form->addElement('text', 'title', get_lang('Title'));
         $height = 140;
     }
diff --git a/public/main/social/my_skills_report.php b/public/main/social/my_skills_report.php
index 581560294b..6dcce78a88 100644
--- a/public/main/social/my_skills_report.php
+++ b/public/main/social/my_skills_report.php
@@ -5,8 +5,6 @@
  * Show the skills report.
  *
  * @author Angel Fernando Quiroz Campos <angel.quiroz@beeznest.com>
- *
- * @package chamilo.social.skill
  */
 use Chamilo\CoreBundle\Framework\Container;
 
@@ -46,8 +44,8 @@ $objSkill = new Skill();
 $tpl = new Template(get_lang('Skills'));
 $tplPath = null;
 
-$tpl->assign('allow_skill_tool', api_get_setting('allow_skills_tool') === 'true');
-$tpl->assign('allow_drh_skills_management', api_get_setting('allow_hr_skills_management') === 'true');
+$tpl->assign('allow_skill_tool', 'true' === api_get_setting('allow_skills_tool'));
+$tpl->assign('allow_drh_skills_management', 'true' === api_get_setting('allow_hr_skills_management'));
 
 if ($isStudent) {
     $result = $objSkill->getUserSkillsTable($userId);
diff --git a/public/main/social/new_promoted_message.php b/public/main/social/new_promoted_message.php
index fdeaa7f3e6..85e32b960b 100644
--- a/public/main/social/new_promoted_message.php
+++ b/public/main/social/new_promoted_message.php
@@ -6,7 +6,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 
 api_protect_admin_script();
 
-if (api_get_setting('allow_social_tool') !== 'true') {
+if ('true' !== api_get_setting('allow_social_tool')) {
     api_not_allowed(true);
 }
 
@@ -16,7 +16,7 @@ $logInfo = [
 ];
 Event::registerLog($logInfo);
 
-$allowSocial = api_get_setting('allow_social_tool') === 'true';
+$allowSocial = 'true' === api_get_setting('allow_social_tool');
 $nameTools = api_xml_http_response_encode(get_lang('Messages'));
 
 $htmlHeadXtra[] = '<script>
diff --git a/public/main/social/personal_data.php b/public/main/social/personal_data.php
index 0f45c784bc..6e9bcd6a14 100644
--- a/public/main/social/personal_data.php
+++ b/public/main/social/personal_data.php
@@ -3,9 +3,6 @@
 
 use Chamilo\CoreBundle\Entity\Repository\LegalRepository;
 
-/**
- * @package chamilo.messages
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
@@ -34,7 +31,7 @@ $substitutionTerms = [
 $action = isset($_REQUEST['action']) ? $_REQUEST['action'] : '';
 $formToString = '';
 
-if (api_get_setting('allow_terms_conditions') === 'true') {
+if ('true' === api_get_setting('allow_terms_conditions')) {
     $form = new FormValidator('delete_term', 'post', api_get_self().'?action=delete_legal&user_id='.$userId);
     $form->addHtml(Display::return_message(get_lang('You can ask below for your legal agreement to be deleted or your account to be deleted.</br>In the case of the legal agreement, once deleted you will have to accept it again on your next login to be able to access the platform and recover your access, because we cannot reasonably at the same time give you a personal environment and not treat your personal data.</br>In the case of an account deletion, your account will be deleted along with all of your course subscriptions and all the information related to your account. Please select the corresponding option with care. In both cases, one of our administrators will review your request before it is effective, to avoid any misunderstanding and definitive loss of your data.'), 'normal', false));
     $form->addTextarea('explanation', [get_lang('Delete legal agreement'), get_lang('ExplanationDelete legal agreement')], [], true);
@@ -203,13 +200,13 @@ if (!empty($_GET['export'])) {
     $filename = md5(mt_rand(0, 1000000)).'.json';
     $path = api_get_path(SYS_ARCHIVE_PATH).$filename;
     $writeResult = file_put_contents($path, $propertiesToJson);
-    if ($writeResult !== false) {
+    if (false !== $writeResult) {
         DocumentManager::file_send_for_download($path, true, $filename);
         exit;
     }
 }
 
-$allowSocial = api_get_setting('allow_social_tool') === 'true';
+$allowSocial = 'true' === api_get_setting('allow_social_tool');
 
 $nameTools = get_lang('Personal data');
 $show_message = null;
@@ -248,7 +245,7 @@ foreach ($properties as $key => $value) {
             case 'classes':
                 foreach ($value as $category => $subValue) {
                     $categoryName = 'Social group';
-                    if ($category == 0) {
+                    if (0 == $category) {
                         $categoryName = 'Class';
                     }
                     $personalDataContent .= '<li class="advanced_options" id="personal-data-list-'.$category.'">';
@@ -289,11 +286,11 @@ foreach ($properties as $key => $value) {
                     if (empty($subValue)) {
                         $personalDataContent .= '<li>'.get_lang('No data available').'</li>';
                     } else {
-                        if (count($subValue) === 1000) {
+                        if (1000 === count($subValue)) {
                             $showWarningMessage = true;
                         }
                         foreach ($subValue as $subSubValue) {
-                            if ($category === 'DocumentsAdded') {
+                            if ('DocumentsAdded' === $category) {
                                 $documentLink = Display::url(
                                     $subSubValue->code_path,
                                     $webCoursePath.$subSubValue->directory.'/document'.$subSubValue->path
@@ -365,7 +362,7 @@ $personalDataContent .= '</ul>';
 
 // Check terms acceptation
 $permissionBlock = '';
-if (api_get_setting('allow_terms_conditions') === 'true') {
+if ('true' === api_get_setting('allow_terms_conditions')) {
     $extraFieldValue = new ExtraFieldValue('user');
     $value = $extraFieldValue->get_values_by_handler_and_field_variable(
         $userId,
@@ -437,7 +434,7 @@ $actions = Display::url(
 $tpl->assign('actions', Display::toolbarAction('toolbar', [$actions]));
 
 $termLink = '';
-if (api_get_setting('allow_terms_conditions') === 'true') {
+if ('true' === api_get_setting('allow_terms_conditions')) {
     $url = api_get_path(WEB_CODE_PATH).'social/terms.php';
     $termLink = Display::url(get_lang('Read the Terms and Conditions'), $url);
 }
@@ -448,7 +445,7 @@ if ($showWarningMessage) {
 
 // Block Social Avatar
 SocialManager::setSocialUserBlock($tpl, api_get_user_id(), 'messages');
-if (api_get_setting('allow_social_tool') === 'true') {
+if ('true' === api_get_setting('allow_social_tool')) {
     $tpl->assign('social_menu_block', $socialMenuBlock);
 } else {
     $tpl->assign('social_menu_block', '');
diff --git a/public/main/social/profile.php b/public/main/social/profile.php
index da9e198e3b..0c9e22c50f 100644
--- a/public/main/social/profile.php
+++ b/public/main/social/profile.php
@@ -10,13 +10,11 @@ use ChamiloSession as Session;
  * @author Isaac Flores Paz <florespaz_isaac@hotmail.com>
  *
  * @todo use Display::panel()
- *
- * @package chamilo.social
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
-if (api_get_setting('allow_social_tool') != 'true') {
+if ('true' != api_get_setting('allow_social_tool')) {
     $url = api_get_path(WEB_PATH).'whoisonline.php?id='.intval($_GET['u']);
     header('Location: '.$url);
     exit;
diff --git a/public/main/social/profile_friends_and_groups.inc.php b/public/main/social/profile_friends_and_groups.inc.php
index e156700ccb..cddeafb7f5 100644
--- a/public/main/social/profile_friends_and_groups.inc.php
+++ b/public/main/social/profile_friends_and_groups.inc.php
@@ -4,15 +4,13 @@
 /**
  * Helper file for friends and groups profiles.
  *
- * @package chamilo.social
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
 api_block_anonymous_users();
-if (api_get_setting('allow_social_tool') != 'true') {
+if ('true' != api_get_setting('allow_social_tool')) {
     api_not_allowed();
 }
 
@@ -22,7 +20,7 @@ $userGroup = new UserGroup();
 
 if (isset($_GET['view']) && in_array($_GET['view'], $views)) {
     // show all friends by user_id
-    if ($_GET['view'] == 'friends') {
+    if ('friends' == $_GET['view']) {
         echo '<div style="margin-top:20px;">';
         $list_path_friends = $list_path_normal_friends = $list_path_parents = [];
         //SOCIALGOODFRIEND , USER_RELATION_TYPE_FRIEND, SOCIALPARENT
@@ -36,7 +34,7 @@ if (isset($_GET['view']) && in_array($_GET['view'], $views)) {
         $friend_html .= '<div id="friend-container" class="social-friend-container">';
         $friend_html .= '<div id="friend-header" >';
 
-        if ($number_friends == 1) {
+        if (1 == $number_friends) {
             $friend_html .= '<div style="float:left;width:80%">'.$number_friends.' '.get_lang('Friend').'</div>';
         } else {
             $friend_html .= '<div style="float:left;width:80%">'.$number_friends.' '.get_lang('Friends').'</div>';
@@ -75,13 +73,13 @@ if (isset($_GET['view']) && in_array($_GET['view'], $views)) {
                 $url_close = '</a>';
                 $icon = '';
                 $name = cut($result['name'], 20, true);
-                if ($result['relation_type'] == GROUP_USER_PERMISSION_ADMIN) {
+                if (GROUP_USER_PERMISSION_ADMIN == $result['relation_type']) {
                     $icon = Display::return_icon(
                         'social_group_admin.png',
                         get_lang('Admin'),
                         ['style' => 'vertical-align:middle;width:16px;height:16px;']
                     );
-                } elseif ($result['relation_type'] == GROUP_USER_PERMISSION_MODERATOR) {
+                } elseif (GROUP_USER_PERMISSION_MODERATOR == $result['relation_type']) {
                     $icon = Display::return_icon(
                         'social_group_moderator.png',
                         get_lang('Moderator'),
@@ -91,7 +89,7 @@ if (isset($_GET['view']) && in_array($_GET['view'], $views)) {
                 $count_users_group = count(
                     $userGroup->get_all_users_by_group($id)
                 );
-                if ($count_users_group == 1) {
+                if (1 == $count_users_group) {
                     $count_users_group = $count_users_group.' '.get_lang('Member');
                 } else {
                     $count_users_group = $count_users_group.' '.get_lang('Members');
@@ -130,7 +128,7 @@ if (isset($_GET['view']) && in_array($_GET['view'], $views)) {
             echo '<div style="margin-top:20px">';
             echo '<div><h3>'.get_lang('My groups').'</h3></div>';
             $count_groups = 0;
-            if (count($results) == 1) {
+            if (1 == count($results)) {
                 $count_groups = count($results).' '.get_lang('Group');
             } else {
                 $count_groups = count($results).' '.get_lang('Groups');
diff --git a/public/main/social/promoted_messages.php b/public/main/social/promoted_messages.php
index e8d0ec16a9..087d6574e4 100644
--- a/public/main/social/promoted_messages.php
+++ b/public/main/social/promoted_messages.php
@@ -7,7 +7,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 
 api_protect_admin_script();
 
-if (api_get_setting('allow_social_tool') !== 'true') {
+if ('true' !== api_get_setting('allow_social_tool')) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/social/search.php b/public/main/social/search.php
index ad3d4541a0..cc59849a7e 100644
--- a/public/main/social/search.php
+++ b/public/main/social/search.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.social
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
@@ -12,7 +10,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 $ajax_url = api_get_path(WEB_AJAX_PATH).'message.ajax.php';
 api_block_anonymous_users();
 
-if (api_get_setting('allow_social_tool') != 'true') {
+if ('true' != api_get_setting('allow_social_tool')) {
     api_not_allowed();
 }
 
@@ -32,7 +30,7 @@ $query_vars = ['q' => $query, 'search_type' => $query_search_type];
 if (!empty($extra_fields)) {
     foreach ($extra_fields as $extra_field) {
         $field_name = 'field_'.$extra_field['variable'];
-        if (isset($_GET[$field_name]) && $_GET[$field_name] != '0') {
+        if (isset($_GET[$field_name]) && '0' != $_GET[$field_name]) {
             $query_vars[$field_name] = $_GET[$field_name];
         }
     }
@@ -50,10 +48,10 @@ $totalUsers = [];
 $usergroup = new UserGroup();
 
 // I'm searching something
-if ($query != '' || ($query_vars['search_type'] == '1' && count($query_vars) > 2)) {
+if ('' != $query || ('1' == $query_vars['search_type'] && count($query_vars) > 2)) {
     $itemPerPage = 6;
 
-    if ($_GET['search_type'] == '0' || $_GET['search_type'] == '1') {
+    if ('0' == $_GET['search_type'] || '1' == $_GET['search_type']) {
         $page = isset($_GET['users_page_nr']) ? intval($_GET['users_page_nr']) : 1;
         $totalUsers = UserManager::get_all_user_tags(
             $_GET['q'],
@@ -68,7 +66,7 @@ if ($query != '' || ($query_vars['search_type'] == '1' && count($query_vars) > 2
         $users = UserManager::get_all_user_tags($_GET['q'], 0, $from, $itemPerPage);
     }
 
-    if ($_GET['search_type'] == '0' || $_GET['search_type'] == '2') {
+    if ('0' == $_GET['search_type'] || '2' == $_GET['search_type']) {
         $pageGroup = isset($_GET['groups_page_nr']) ? intval($_GET['groups_page_nr']) : 1;
         // Groups
         $fromGroups = intval(($pageGroup - 1) * $itemPerPage);
@@ -93,7 +91,7 @@ if ($query != '' || ($query_vars['search_type'] == '1' && count($query_vars) > 2
             $url = api_get_path(WEB_PATH).'main/social/profile.php?u='.$user_info['user_id'];
 
             // Show send invitation icon if they are not friends yet
-            if ($relation_type != 3 && $relation_type != 4 && $user_info['user_id'] != api_get_user_id()) {
+            if (3 != $relation_type && 4 != $relation_type && $user_info['user_id'] != api_get_user_id()) {
                 $sendInvitation = '<a href="#" class="'.$buttonClass.' btn-to-send-invitation" data-send-to="'.$user_info['user_id'].'">
                              <em class="fa fa-user"></em> '.get_lang('Send invitation').'</a>';
             }
@@ -120,7 +118,7 @@ if ($query != '' || ($query_vars['search_type'] == '1' && count($query_vars) > 2
                 $status_icon = Display::return_icon('offline.png', get_lang('Disconnected'), null, ICON_SIZE_TINY);
             }
 
-            if ($user_info['status'] == 5) {
+            if (5 == $user_info['status']) {
                 $user_icon = Display::return_icon('user.png', get_lang('Learner'), null, ICON_SIZE_TINY);
             } else {
                 $user_icon = Display::return_icon('teacher.png', get_lang('Trainer'), null, ICON_SIZE_TINY);
@@ -176,7 +174,7 @@ if ($query != '' || ($query_vars['search_type'] == '1' && count($query_vars) > 2
             $url_close = '</a>';
             $name = cut($group['name'], 60, true);
             $count_users_group = count($usergroup->get_all_users_by_group($id));
-            if ($count_users_group == 1) {
+            if (1 == $count_users_group) {
                 $count_users_group = $count_users_group;
             } else {
                 $count_users_group = $count_users_group;
diff --git a/public/main/social/skills_tree.php b/public/main/social/skills_tree.php
index 9df4a76256..f3769a2679 100644
--- a/public/main/social/skills_tree.php
+++ b/public/main/social/skills_tree.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/social/skills_wheel.php b/public/main/social/skills_wheel.php
index c6ef8074c8..459d718f34 100644
--- a/public/main/social/skills_wheel.php
+++ b/public/main/social/skills_wheel.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- *  @package chamilo.admin
- */
 $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/social/terms.php b/public/main/social/terms.php
index f910f57473..ff2b23fb1e 100644
--- a/public/main/social/terms.php
+++ b/public/main/social/terms.php
@@ -5,7 +5,7 @@ $cidReset = true;
 
 require_once __DIR__.'/../inc/global.inc.php';
 
-if (api_get_setting('allow_terms_conditions') !== 'true') {
+if ('true' !== api_get_setting('allow_terms_conditions')) {
     api_not_allowed(true);
 }
 
@@ -41,7 +41,7 @@ $term['date_text'] = get_lang('Publication date').': '.
     );
 
 $socialMenuBlock = '';
-$allowSocial = api_get_setting('allow_social_tool') === 'true';
+$allowSocial = 'true' === api_get_setting('allow_social_tool');
 
 if ($allowSocial) {
     // Block Social Menu
@@ -59,7 +59,7 @@ $tpl->assign('actions', Display::toolbarAction('toolbar', [$actions]));
 
 // Block Social Avatar
 SocialManager::setSocialUserBlock($tpl, api_get_user_id(), 'messages');
-if (api_get_setting('allow_social_tool') === 'true') {
+if ('true' === api_get_setting('allow_social_tool')) {
     $tpl->assign('social_menu_block', $socialMenuBlock);
 } else {
     $tpl->assign('social_menu_block', '');
diff --git a/public/main/social/vcard_export.php b/public/main/social/vcard_export.php
index 03055e96f0..d454fb9580 100644
--- a/public/main/social/vcard_export.php
+++ b/public/main/social/vcard_export.php
@@ -6,8 +6,6 @@ use JeroenDesloovere\VCard\VCard;
 /**
  * VCard Generator.
  *
- * @package chamilo.social
- *
  * @author José Loguercio Silva <jose.loguercio@beeznest.com>
  */
 require_once __DIR__.'/../inc/global.inc.php';
@@ -36,7 +34,7 @@ $vcard = new VCard();
 // Adding the User Info to the vCard
 $vcard->addName($userInfo['firstname'], $userInfo['lastname']);
 
-if (api_get_setting('show_email_addresses') == 'true') {
+if ('true' == api_get_setting('show_email_addresses')) {
     $vcard->addEmail($userInfo['email']);
 }
 
diff --git a/public/main/social/view_promoted_message.php b/public/main/social/view_promoted_message.php
index 7765c408c6..c0976ee395 100644
--- a/public/main/social/view_promoted_message.php
+++ b/public/main/social/view_promoted_message.php
@@ -5,7 +5,7 @@ $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
 api_block_anonymous_users();
 
-if (api_get_setting('allow_social_tool') != 'true') {
+if ('true' != api_get_setting('allow_social_tool')) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/survey/ch_multipleresponse.php b/public/main/survey/ch_multipleresponse.php
index 65a5ee83ef..e7d382fead 100644
--- a/public/main/survey/ch_multipleresponse.php
+++ b/public/main/survey/ch_multipleresponse.php
@@ -49,7 +49,7 @@ class ch_multipleresponse extends survey_question
     ) {
         $class = 'checkbox-inline';
         $labelClass = 'checkbox-inline';
-        if ($questionData['display'] == 'vertical') {
+        if ('vertical' == $questionData['display']) {
             $class = 'checkbox-vertical';
         }
 
diff --git a/public/main/survey/ch_personality.php b/public/main/survey/ch_personality.php
index 02032f0cd3..6dd8652dcb 100644
--- a/public/main/survey/ch_personality.php
+++ b/public/main/survey/ch_personality.php
@@ -24,13 +24,13 @@ class ch_personality extends survey_question
         $this->html .= '		<td align="right" valign="top">&nbsp;</td>';
         $this->html .= '		<td>';
         $this->html .= '		  <input name="horizontalvertical" type="radio" value="horizontal" ';
-        if (empty($form_content['horizontalvertical']) || $form_content['horizontalvertical'] == 'horizontal') {
+        if (empty($form_content['horizontalvertical']) || 'horizontal' == $form_content['horizontalvertical']) {
             $this->html .= 'checked="checked"';
         }
         $this->html .= '/>'.get_lang('Horizontal').'</label><br />';
         $this->html .= '		  <input name="horizontalvertical" type="radio" value="vertical" ';
 
-        if (isset($form_content['horizontalvertical']) && $form_content['horizontalvertical'] == 'vertical') {
+        if (isset($form_content['horizontalvertical']) && 'vertical' == $form_content['horizontalvertical']) {
             $this->html .= 'checked="checked"';
         }
 
diff --git a/public/main/survey/ch_yesno.php b/public/main/survey/ch_yesno.php
index 04a732d037..587611136f 100644
--- a/public/main/survey/ch_yesno.php
+++ b/public/main/survey/ch_yesno.php
@@ -54,7 +54,7 @@ class ch_yesno extends survey_question
         if (is_array($questionData['options'])) {
             $class = 'radio-inline';
             $labelClass = 'radio-inline';
-            if ($questionData['display'] == 'vertical') {
+            if ('vertical' == $questionData['display']) {
                 $class = 'radio-vertical';
             }
 
diff --git a/public/main/survey/copy_survey.php b/public/main/survey/copy_survey.php
index 7d542e3845..f52107afec 100644
--- a/public/main/survey/copy_survey.php
+++ b/public/main/survey/copy_survey.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.backup
- */
+
 require_once __DIR__.'/../inc/global.inc.php';
 
 $current_course_tool = TOOL_COURSE_MAINTENANCE;
diff --git a/public/main/survey/create_new_survey.php b/public/main/survey/create_new_survey.php
index 11d5b9ae03..3848c8ea11 100644
--- a/public/main/survey/create_new_survey.php
+++ b/public/main/survey/create_new_survey.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.survey
- *
  * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University: cleanup,
  *  refactoring and rewriting large parts (if not all) of the code
  * @author Julio Montoya Armas <gugli100@gmail.com>, Chamilo: Personality
@@ -46,14 +44,14 @@ $gradebook_link_type = 8;
 $urlname = isset($survey_data['title']) ? strip_tags($survey_data['title']) : null;
 
 // Breadcrumbs
-if ($action == 'add') {
+if ('add' == $action) {
     $interbreadcrumb[] = [
         'url' => api_get_path(WEB_CODE_PATH).'survey/survey_list.php?'.api_get_cidreq(),
         'name' => get_lang('Survey list'),
     ];
     $tool_name = get_lang('Create survey');
 }
-if ($action == 'edit' && is_numeric($survey_id)) {
+if ('edit' == $action && is_numeric($survey_id)) {
     $interbreadcrumb[] = [
         'url' => api_get_path(WEB_CODE_PATH).'survey/survey_list.php?'.api_get_cidreq(),
         'name' => get_lang('Survey list'),
@@ -66,7 +64,7 @@ if ($action == 'edit' && is_numeric($survey_id)) {
 }
 $gradebook_link_id = null;
 // Getting the default values
-if ($action == 'edit' && isset($survey_id) && is_numeric($survey_id)) {
+if ('edit' == $action && isset($survey_id) && is_numeric($survey_id)) {
     $defaults = $survey_data;
     $defaults['survey_id'] = $survey_id;
     $defaults['anonymous'] = $survey_data['anonymous'];
@@ -121,7 +119,7 @@ $form = new FormValidator(
 $form->addElement('header', $tool_name);
 
 // Setting the form elements
-if ($action == 'edit' && isset($survey_id) && is_numeric($survey_id)) {
+if ('edit' == $action && isset($survey_id) && is_numeric($survey_id)) {
     $form->addElement('hidden', 'survey_id');
 }
 
@@ -132,7 +130,7 @@ $survey_code = $form->addElement(
     ['size' => '20', 'maxlength' => '20', 'autofocus' => 'autofocus']
 );
 
-if ($action == 'edit') {
+if ('edit' == $action) {
     $survey_code->freeze();
     $form->applyFilter('survey_code', 'api_strtoupper');
 }
@@ -235,7 +233,7 @@ if (Gradebook::is_active()) {
 
     // Loading Gradebook select
     GradebookUtils::load_gradebook_select_in_tool($form);
-    if ($action == 'edit') {
+    if ('edit' == $action) {
         $element = $form->getElement('category_id');
         $element->freeze();
     }
@@ -246,7 +244,7 @@ if (Gradebook::is_active()) {
 $surveytypes[0] = get_lang('Normal');
 $surveytypes[1] = get_lang('Conditional');
 
-if ($action == 'add') {
+if ('add' == $action) {
     $form->addElement('hidden', 'survey_type', 0);
     $survey_tree = new SurveyTree();
     $list_surveys = $survey_tree->createList($survey_tree->surveylist);
@@ -260,8 +258,8 @@ $form->addElement('checkbox', 'shuffle', null, get_lang('Enable shuffle mode'));
 
 $input_name_list = null;
 
-if ($action == 'edit' && !empty($survey_id)) {
-    if ($survey_data['anonymous'] == 0) {
+if ('edit' == $action && !empty($survey_id)) {
+    if (0 == $survey_data['anonymous']) {
         $form->addElement(
             'checkbox',
             'show_form_profile',
@@ -270,7 +268,7 @@ if ($action == 'edit' && !empty($survey_id)) {
             'onclick="javascript: if(this.checked){document.getElementById(\'options_field\').style.display = \'block\';}else{document.getElementById(\'options_field\').style.display = \'none\';}"'
         );
 
-        if ($survey_data['show_form_profile'] == 1) {
+        if (1 == $survey_data['show_form_profile']) {
             $form->addElement('html', '<div id="options_field" style="display:block">');
         } else {
             $form->addElement('html', '<div id="options_field" style="display:none">');
@@ -281,7 +279,7 @@ if ($action == 'edit' && !empty($survey_id)) {
         if (is_array($field_list)) {
             // TODO hide and show the list in a fancy DIV
             foreach ($field_list as $key => &$field) {
-                if ($field['visibility'] == 1) {
+                if (1 == $field['visibility']) {
                     $form->addElement('checkbox', 'profile_'.$key, ' ', '&nbsp;&nbsp;'.$field['name']);
                     $input_name_list .= 'profile_'.$key.',';
                 }
@@ -295,7 +293,7 @@ if ($action == 'edit' && !empty($survey_id)) {
                 $form_fields = explode('@', $survey_data['form_fields']);
                 foreach ($form_fields as &$field) {
                     $field_value = explode(':', $field);
-                    if ($field_value[0] != '' && $field_value[1] != '') {
+                    if ('' != $field_value[0] && '' != $field_value[1]) {
                         $defaults[$field_value[0]] = $field_value[1];
                     }
                 }
@@ -309,14 +307,14 @@ $skillList = Skill::addSkillsToForm($form, ITEM_TYPE_SURVEY, $survey_id);
 
 $form->addElement('html', '</div><br />');
 
-if (isset($_GET['survey_id']) && $action == 'edit') {
+if (isset($_GET['survey_id']) && 'edit' == $action) {
     $form->addButtonUpdate(get_lang('Edit survey'), 'submit_survey');
 } else {
     $form->addButtonCreate(get_lang('Create survey'), 'submit_survey');
 }
 
 // Setting the rules
-if ($action == 'add') {
+if ('add' == $action) {
     $form->addRule('survey_code', get_lang('Required field'), 'required');
     $form->addRule('survey_code', '', 'maxlength', 20);
 }
diff --git a/public/main/survey/edit_meeting.php b/public/main/survey/edit_meeting.php
index 8cc3eb9cb2..26460cf9dc 100644
--- a/public/main/survey/edit_meeting.php
+++ b/public/main/survey/edit_meeting.php
@@ -169,7 +169,7 @@ if ($form->validate()) {
 
             $date = $values[$name];
 
-            if ($date === 'delete' && !empty($id)) {
+            if ('delete' === $date && !empty($id)) {
                 $deleteItems[] = $id;
             }
 
diff --git a/public/main/survey/fillsurvey.php b/public/main/survey/fillsurvey.php
index f5348ae7db..9c92b6c0f2 100644
--- a/public/main/survey/fillsurvey.php
+++ b/public/main/survey/fillsurvey.php
@@ -4,8 +4,6 @@
 use ChamiloSession as Session;
 
 /**
- * @package chamilo.survey
- *
  * @author unknown, the initial survey that did not make it in 1.8 because of bad code
  * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University: cleanup,
  * refactoring and rewriting large parts of the code
@@ -68,7 +66,7 @@ if (!empty($userInfo)) {
 $course_id = $courseInfo['real_id'];
 $surveyCode = isset($_GET['scode']) ? Database::escape_string($_GET['scode']) : '';
 
-if ($surveyCode != '') {
+if ('' != $surveyCode) {
     // Firstly we check if this survey is ready for anonymous use:
     $sql = "SELECT anonymous FROM $table_survey
             WHERE c_id = $course_id AND code ='".$surveyCode."'";
@@ -76,8 +74,8 @@ if ($surveyCode != '') {
     $rowAnonymous = Database::fetch_array($resultAnonymous, 'ASSOC');
     // If is anonymous and is not allowed to take the survey to anonymous users, forbid access:
     if (!isset($rowAnonymous['anonymous']) ||
-        ($rowAnonymous['anonymous'] == 0 && api_is_anonymous()) ||
-        count($rowAnonymous) == 0
+        (0 == $rowAnonymous['anonymous'] && api_is_anonymous()) ||
+        0 == count($rowAnonymous)
     ) {
         api_not_allowed(true);
     }
@@ -92,7 +90,7 @@ if ((!isset($_GET['course']) || !isset($_GET['invitationcode'])) && !isset($_GET
 $invitationcode = $_GET['invitationcode'];
 
 // Start auto-invitation feature FS#3403 (all-users-can-do-the-survey-URL handling)
-if ($invitationcode == 'auto' && isset($_GET['scode'])) {
+if ('auto' == $invitationcode && isset($_GET['scode'])) {
     $userid = api_get_user_id();
     // Survey_code of the survey
     $surveyCode = $_GET['scode'];
@@ -132,7 +130,7 @@ if ($invitationcode == 'auto' && isset($_GET['scode'])) {
                     invitation_code = '".Database::escape_string($autoInvitationcode)."'";
         $result = Database::query($sql);
         $now = api_get_utc_datetime();
-        if (Database :: num_rows($result) == 0) {
+        if (0 == Database :: num_rows($result)) {
             $params = [
                 'c_id' => $course_id,
                 'survey_code' => $surveyCode,
@@ -167,7 +165,7 @@ if (!isset($_POST['finish_survey']) &&
         !empty($surveyUserFromSession) &&
         SurveyUtil::isSurveyAnsweredFlagged($survey_invitation['survey_code'], $survey_invitation['c_id'])
     ) ||
-    ($survey_invitation['answered'] == 1 && !isset($_GET['user_id']))
+    (1 == $survey_invitation['answered'] && !isset($_GET['user_id']))
 ) {
     api_not_allowed(true, Display::return_message(get_lang('You already filled this survey')));
 }
@@ -227,7 +225,7 @@ if (empty($survey_data)) {
 SurveyManager::checkTimeAvailability($survey_data);
 $survey_data['survey_id'] = $survey_invitation['survey_id'];
 
-if ($survey_data['survey_type'] == '3') {
+if ('3' == $survey_data['survey_type']) {
     header('Location: '.
         api_get_path(WEB_CODE_PATH).
         'survey/meeting.php?cidReq='.$courseInfo['code'].'&id_session='.$sessionId.'&invitationcode='.Security::remove_XSS($invitationcode)
@@ -241,7 +239,7 @@ if (!empty($survey_data['anonymous'])) {
 
 // Storing the answers
 if (count($_POST) > 0) {
-    if ($survey_data['survey_type'] === '0') {
+    if ('0' === $survey_data['survey_type']) {
         $types = [];
         $required = [];
         // Getting all the types of the question
@@ -260,7 +258,7 @@ if (count($_POST) > 0) {
         // Looping through all the post values
         foreach ($_POST as $key => &$value) {
             // If the post value key contains the string 'question' then it is an answer on a question
-            if (strpos($key, 'question') !== false && ($key != '_qf__question')) {
+            if (false !== strpos($key, 'question') && ('_qf__question' != $key)) {
                 // Finding the question id by removing 'question'
                 $survey_question_id = str_replace('question', '', $key);
                 // If not question ID was defined, we're on the start
@@ -282,7 +280,7 @@ if (count($_POST) > 0) {
                     );
 
                     foreach ($value as $answer_key => &$answer_value) {
-                        if ($types[$survey_question_id] == 'score') {
+                        if ('score' == $types[$survey_question_id]) {
                             $option_id = $answer_key;
                             $option_value = $answer_value;
                         } else {
@@ -302,7 +300,7 @@ if (count($_POST) > 0) {
                 } else {
                     // All the other question types (open question, multiple choice, percentage, ...)
                     if (isset($types[$survey_question_id]) &&
-                        $types[$survey_question_id] == 'percentage') {
+                        'percentage' == $types[$survey_question_id]) {
                         $sql = "SELECT * FROM $table_survey_question_option
                                 WHERE
                                     c_id = $course_id AND
@@ -313,7 +311,7 @@ if (count($_POST) > 0) {
                     } else {
                         $option_value = 0;
                         if (isset($types[$survey_question_id]) &&
-                            $types[$survey_question_id] == 'open'
+                            'open' == $types[$survey_question_id]
                         ) {
                             $option_value = $value;
                         }
@@ -339,11 +337,11 @@ if (count($_POST) > 0) {
                 }
             }
         }
-    } elseif ($survey_data['survey_type'] === '1') {
+    } elseif ('1' === $survey_data['survey_type']) {
         //conditional/personality-test type surveys
         // Getting all the types of the question (because of the special treatment of the score question type
         $shuffle = '';
-        if ($survey_data['shuffle'] == '1') {
+        if ('1' == $survey_data['shuffle']) {
             $shuffle = ' ORDER BY RAND() ';
         }
         $sql = "SELECT * FROM $table_survey_question
@@ -360,7 +358,7 @@ if (count($_POST) > 0) {
         // Looping through all the post values
         foreach ($_POST as $key => &$value) {
             // If the post value key contains the string 'question' then it is an answer to a question
-            if (strpos($key, 'question') !== false) {
+            if (false !== strpos($key, 'question')) {
                 // Finding the question id by removing 'question'
                 $survey_question_id = str_replace('question', '', $key);
                 // If not question ID was defined, we're on the start
@@ -404,21 +402,21 @@ if (count($_POST) > 0) {
 
 $user_id = api_get_user_id();
 
-if ($user_id == 0) {
+if (0 == $user_id) {
     $user_id = $survey_invitation['user'];
 }
 $user_data = api_get_user_info($user_id);
 
-if ($survey_data['form_fields'] != '' &&
-    $survey_data['anonymous'] == 0 &&
+if ('' != $survey_data['form_fields'] &&
+    0 == $survey_data['anonymous'] &&
     is_array($user_data)
 ) {
     $form_fields = explode('@', $survey_data['form_fields']);
     $list = [];
     foreach ($form_fields as $field) {
         $field_value = explode(':', $field);
-        if (isset($field_value[1]) && $field_value[1] == 1) {
-            if ($field_value[0] != '') {
+        if (isset($field_value[1]) && 1 == $field_value[1]) {
+            if ('' != $field_value[0]) {
                 $val = api_substr($field_value[0], 8, api_strlen($field_value[0]));
                 $list[$val] = 1;
             }
@@ -436,20 +434,20 @@ if ($survey_data['form_fields'] != '' &&
     // We use the same form as in auth/profile.php
     $form = new FormValidator('profile', 'post', $url);
     if (api_is_western_name_order()) {
-        if (isset($list['firstname']) && $list['firstname'] == 1) {
+        if (isset($list['firstname']) && 1 == $list['firstname']) {
             //FIRST NAME
             $form->addElement('text', 'firstname', get_lang('First name'), ['size' => 40]);
-            if (api_get_setting('profile', 'name') !== 'true') {
+            if ('true' !== api_get_setting('profile', 'name')) {
                 $form->freeze(['firstname']);
             }
             $form->applyFilter(['firstname'], 'stripslashes');
             $form->applyFilter(['firstname'], 'trim');
             $form->addRule('firstname', get_lang('Required field'), 'required');
         }
-        if (isset($list['lastname']) && $list['lastname'] == 1) {
+        if (isset($list['lastname']) && 1 == $list['lastname']) {
             //    LAST NAME
             $form->addElement('text', 'lastname', get_lang('Last name'), ['size' => 40]);
-            if (api_get_setting('profile', 'name') !== 'true') {
+            if ('true' !== api_get_setting('profile', 'name')) {
                 $form->freeze(['lastname']);
             }
             $form->applyFilter(['lastname'], 'stripslashes');
@@ -457,20 +455,20 @@ if ($survey_data['form_fields'] != '' &&
             $form->addRule('lastname', get_lang('Required field'), 'required');
         }
     } else {
-        if (isset($list['lastname']) && $list['lastname'] == 1) {
+        if (isset($list['lastname']) && 1 == $list['lastname']) {
             //    LAST NAME
             $form->addElement('text', 'lastname', get_lang('Last name'), ['size' => 40]);
-            if (api_get_setting('profile', 'name') !== 'true') {
+            if ('true' !== api_get_setting('profile', 'name')) {
                 $form->freeze(['lastname']);
             }
             $form->applyFilter(['lastname'], 'stripslashes');
             $form->applyFilter(['lastname'], 'trim');
             $form->addRule('lastname', get_lang('Required field'), 'required');
         }
-        if (isset($list['firstname']) && $list['firstname'] == 1) {
+        if (isset($list['firstname']) && 1 == $list['firstname']) {
             //FIRST NAME
             $form->addElement('text', 'firstname', get_lang('First name'), ['size' => 40]);
-            if (api_get_setting('profile', 'name') !== 'true') {
+            if ('true' !== api_get_setting('profile', 'name')) {
                 $form->freeze(['firstname']);
             }
             $form->applyFilter(['firstname'], 'stripslashes');
@@ -479,55 +477,55 @@ if ($survey_data['form_fields'] != '' &&
         }
     }
 
-    if (isset($list['official_code']) && $list['official_code'] == 1) {
+    if (isset($list['official_code']) && 1 == $list['official_code']) {
         //    OFFICIAL CODE
         $form->addElement('text', 'official_code', get_lang('Code'), ['size' => 40]);
-        if (api_get_setting('profile', 'officialcode') !== 'true') {
+        if ('true' !== api_get_setting('profile', 'officialcode')) {
             $form->freeze('official_code');
         }
         $form->applyFilter('official_code', 'stripslashes');
         $form->applyFilter('official_code', 'trim');
-        if (api_get_setting('registration', 'officialcode') == 'true' &&
-            api_get_setting('profile', 'officialcode') == 'true'
+        if ('true' == api_get_setting('registration', 'officialcode') &&
+            'true' == api_get_setting('profile', 'officialcode')
         ) {
             $form->addRule('official_code', get_lang('Required field'), 'required');
         }
     }
 
-    if (isset($list['email']) && $list['email'] == 1) {
+    if (isset($list['email']) && 1 == $list['email']) {
         //    EMAIL
         $form->addElement('text', 'email', get_lang('e-mail'), ['size' => 40]);
-        if (api_get_setting('profile', 'email') !== 'true') {
+        if ('true' !== api_get_setting('profile', 'email')) {
             $form->freeze('email');
         }
         $form->applyFilter('email', 'stripslashes');
         $form->applyFilter('email', 'trim');
-        if (api_get_setting('registration', 'email') == 'true') {
+        if ('true' == api_get_setting('registration', 'email')) {
             $form->addRule('email', get_lang('Required field'), 'required');
         }
         $form->addRule('email', get_lang('e-mailWrong'), 'email');
     }
 
-    if (isset($list['phone']) && $list['phone'] == 1) {
+    if (isset($list['phone']) && 1 == $list['phone']) {
         // PHONE
         $form->addElement('text', 'phone', get_lang('Phone'), ['size' => 20]);
-        if (api_get_setting('profile', 'phone') !== 'true') {
+        if ('true' !== api_get_setting('profile', 'phone')) {
             $form->freeze('phone');
         }
         $form->applyFilter('phone', 'stripslashes');
         $form->applyFilter('phone', 'trim');
-        if (api_get_setting('profile', 'phone') == 'true') {
+        if ('true' == api_get_setting('profile', 'phone')) {
             $form->addRule('phone', get_lang('Required field'), 'required');
         }
     }
 
-    if (isset($list['language']) && $list['language'] == 1) {
+    if (isset($list['language']) && 1 == $list['language']) {
         // LANGUAGE
         $form->addSelectLanguage('language', get_lang('Language'));
-        if (api_get_setting('profile', 'language') !== 'true') {
+        if ('true' !== api_get_setting('profile', 'language')) {
             $form->freeze('language');
         }
-        if (api_get_setting('profile', 'language') == 'true') {
+        if ('true' == api_get_setting('profile', 'language')) {
             $form->addRule('language', get_lang('Required field'), 'required');
         }
     }
@@ -565,7 +563,7 @@ if (!empty($survey_data['survey_subtitle'])) {
 // Displaying the survey introduction
 if (
     !isset($_GET['show']) ||
-    (isset($_GET['show'])) && $_GET['show'] == '') {
+    (isset($_GET['show'])) && '' == $_GET['show']) {
     // The first thing we do is delete the session
     Session::erase('paged_questions');
     Session::erase('page_questions_sec');
@@ -577,7 +575,7 @@ if (
 }
 
 if ($survey_data['form_fields'] &&
-    $survey_data['anonymous'] == 0 &&
+    0 == $survey_data['anonymous'] &&
     is_array($user_data) &&
     !isset($_GET['show'])
 ) {
@@ -667,11 +665,11 @@ if (isset($_POST['finish_survey'])) {
 
 // Sets the random questions
 $shuffle = '';
-if ($survey_data['shuffle'] == 1) {
+if (1 == $survey_data['shuffle']) {
     $shuffle = ' BY RAND() ';
 }
 
-if ((isset($_GET['show']) && $_GET['show'] != '') ||
+if ((isset($_GET['show']) && '' != $_GET['show']) ||
     isset($_POST['personality'])
 ) {
     // Getting all the questions for this page and add them to a
@@ -682,7 +680,7 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
     //$paged_questions = Session::read('paged_questions');
     $paged_questions = [];
     // If non-conditional survey
-    if ($survey_data['survey_type'] == '0') {
+    if ('0' == $survey_data['survey_type']) {
         if (empty($paged_questions)) {
             $sql = "SELECT * FROM $table_survey_question
                     WHERE
@@ -692,14 +690,14 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
                     ORDER BY sort ASC";
             $result = Database::query($sql);
             while ($row = Database::fetch_array($result, 'ASSOC')) {
-                if ($survey_data['one_question_per_page'] == 1) {
-                    if ($row['type'] != 'pagebreak') {
+                if (1 == $survey_data['one_question_per_page']) {
+                    if ('pagebreak' != $row['type']) {
                         $paged_questions[$counter][] = $row['question_id'];
                         $counter++;
                         continue;
                     }
                 } else {
-                    if ($row['type'] == 'pagebreak') {
+                    if ('pagebreak' == $row['type']) {
                         $counter++;
                     } else {
                         $paged_questions[$counter][] = $row['question_id'];
@@ -718,7 +716,7 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
         if (array_key_exists($_GET['show'], $paged_questions)) {
             if (isset($_GET['user_id'])) {
                 // Get the user into survey answer table (user or anonymus)
-                $my_user_id = $survey_data['anonymous'] == 1 ? $surveyUserFromSession : api_get_user_id();
+                $my_user_id = 1 == $survey_data['anonymous'] ? $surveyUserFromSession : api_get_user_id();
 
                 $sql = "SELECT
                             survey_question.survey_group_sec1,
@@ -782,7 +780,7 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
             $questions = [];
             while ($row = Database :: fetch_array($result, 'ASSOC')) {
                 // If the type is not a pagebreak we store it in the $questions array
-                if ($row['type'] != 'pagebreak') {
+                if ('pagebreak' != $row['type']) {
                     $questions[$row['sort']]['question_id'] = $row['question_id'];
                     $questions[$row['sort']]['survey_id'] = $row['survey_id'];
                     $questions[$row['sort']]['survey_question'] = $row['survey_question'];
@@ -796,13 +794,13 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
                 $counter++;
             }
         }
-    } elseif ($survey_data['survey_type'] === '1') {
+    } elseif ('1' === $survey_data['survey_type']) {
         $my_survey_id = (int) $survey_invitation['survey_id'];
         $current_user = Database::escape_string($survey_invitation['user']);
 
         if (isset($_POST['personality'])) {
             // Compute the results to get the 3 groups nearest to the user's personality
-            if ($shuffle == '') {
+            if ('' == $shuffle) {
                 $order = 'BY sort ASC ';
             } else {
                 $order = $shuffle;
@@ -906,7 +904,7 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
             // If we have only 3 or less equal scores (i.e. 0,1 or 2 equalities), then we can use the three first groups
             if ($equal_count < 4) {
                 // If there is one or less score equalities
-                if ($equal_count === 0 || $equal_count === 1) {
+                if (0 === $equal_count || 1 === $equal_count) {
                     // i.e 70% - 70% -60% - 60%  $equal_count = 1 we only get the first 2 options
                     if (($result[0]['value'] == $result[1]['value']) &&
                         ($result[2]['value'] == $result[3]['value'])
@@ -952,13 +950,13 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
                         $group1 = $groups[$i];
                         $group2 = $groups[$i + 1];
                         // Here we made all the posibilities with the 3 groups
-                        if ($group_cant == 2 && $i == $group_cant) {
+                        if (2 == $group_cant && $i == $group_cant) {
                             $group2 = $groups[0];
                             $secondary .= " OR ( survey_group_sec1 = '$group1' AND  survey_group_sec2 = '$group2') ";
                             $secondary .= " OR ( survey_group_sec1 = '$group2' AND survey_group_sec2 = '$group1' ) ";
                             $combi .= $group1.' - '.$group2." or ".$group2.' - '.$group1.'<br />';
                         } else {
-                            if ($i != 0) {
+                            if (0 != $i) {
                                 $secondary .= " OR ( survey_group_sec1 = '$group1' AND  survey_group_sec2 = '$group2') ";
                                 $secondary .= " OR ( survey_group_sec1 = '$group2' AND survey_group_sec2 = '$group1' ) ";
                                 $combi .= $group1.' - '.$group2." or ".$group2.' - '.$group1.'<br />';
@@ -972,7 +970,7 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
                     // Create the new select with the questions from the secondary phase
                     if (empty($_SESSION['page_questions_sec']) &&
                         !is_array($_SESSION['page_questions_sec']) &&
-                        count($_SESSION['page_questions_sec'] == 0)
+                        count(0 == $_SESSION['page_questions_sec'])
                     ) {
                         $sql = "SELECT * FROM $table_survey_question
                                  WHERE
@@ -983,10 +981,10 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
                         $result = Database::query($sql);
                         $counter = 0;
                         while ($row = Database::fetch_array($result, 'ASSOC')) {
-                            if ($survey_data['one_question_per_page'] == 1) {
+                            if (1 == $survey_data['one_question_per_page']) {
                                 $paged_questions_sec[$counter][] = $row['question_id'];
                                 $counter++;
-                            } elseif ($row['type'] == 'pagebreak') {
+                            } elseif ('pagebreak' == $row['type']) {
                                 $counter++;
                             } else {
                                 // ids from question of the current survey
@@ -998,7 +996,7 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
                         $paged_questions_sec = Session::read('page_questions_sec');
                     }
                     $paged_questions = Session::read('paged_questions'); // For the sake of pages counting
-                    if ($shuffle == '') {
+                    if ('' == $shuffle) {
                         $shuffle = ' BY survey_question.sort, survey_question_option.sort ASC ';
                     }
                     $val = (int) $_POST['personality'];
@@ -1035,7 +1033,7 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
                         $questions = [];
                         while ($row = Database::fetch_array($result, 'ASSOC')) {
                             // If the type is not a pagebreak we store it in the $questions array
-                            if ($row['type'] != 'pagebreak') {
+                            if ('pagebreak' != $row['type']) {
                                 $questions[$row['sort']]['question_id'] = $row['question_id'];
                                 $questions[$row['sort']]['survey_id'] = $row['survey_id'];
                                 $questions[$row['sort']]['survey_question'] = $row['survey_question'];
@@ -1071,7 +1069,7 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
             // Only the questions from the basic group
             // the 50 questions A B C D E F G
             $order_sql = $shuffle;
-            if ($shuffle == '') {
+            if ('' == $shuffle) {
                 $order_sql = ' BY question_id ';
             }
 
@@ -1086,11 +1084,11 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
                 $result = Database::query($sql);
                 $counter = 0;
                 while ($row = Database::fetch_array($result, 'ASSOC')) {
-                    if ($survey_data['one_question_per_page'] == 1) {
+                    if (1 == $survey_data['one_question_per_page']) {
                         $paged_questions[$counter][] = $row['question_id'];
                         $counter++;
                     } else {
-                        if ($row['type'] == 'pagebreak') {
+                        if ('pagebreak' == $row['type']) {
                             $counter++;
                         } else {
                             // ids from question of the current survey
@@ -1103,14 +1101,14 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
                 $paged_questions = Session::read('paged_questions');
             }
             $order_sql = $shuffle;
-            if ($shuffle == '') {
+            if ('' == $shuffle) {
                 $order_sql = ' BY survey_question.sort, survey_question_option.sort ASC ';
             }
             $val = $_GET['show'];
             $result = null;
-            if ($val != '') {
+            if ('' != $val) {
                 $imploded = Database::escape_string(implode(',', $paged_questions[$val]));
-                if ($imploded != '') {
+                if ('' != $imploded) {
                     // The answers are always in the same order NO shuffle
                     $order_sql = ' BY survey_question.sort, survey_question_option.sort ASC ';
                     $sql = "SELECT
@@ -1149,7 +1147,7 @@ if ((isset($_GET['show']) && $_GET['show'] != '') ||
                 $questions = [];
                 while ($row = Database :: fetch_array($result, 'ASSOC')) {
                     // If the type is not a pagebreak we store it in the $questions array
-                    if ($row['type'] != 'pagebreak') {
+                    if ('pagebreak' != $row['type']) {
                         $questions[$row['sort']]['question_id'] = $row['question_id'];
                         $questions[$row['sort']]['survey_id'] = $row['survey_id'];
                         $questions[$row['sort']]['survey_question'] = $row['survey_question'];
@@ -1180,12 +1178,12 @@ $numberOfPages = SurveyManager::getCountPages($survey_data);
 
 // Displaying the form with the questions
 $show = 0;
-if (isset($_GET['show']) && $_GET['show'] != '') {
+if (isset($_GET['show']) && '' != $_GET['show']) {
     $show = (int) $_GET['show'] + 1;
 }
 
 $displayFinishButton = true;
-if (isset($_GET['show']) && $_GET['show'] != '') {
+if (isset($_GET['show']) && '' != $_GET['show']) {
     $pagesIndexes = array_keys($paged_questions);
     $pagesIndexes[] = count($pagesIndexes);
 
@@ -1273,11 +1271,11 @@ if (isset($questions) && is_array($questions)) {
 }
 
 $form->addHtml('<div class="start-survey">');
-if ($survey_data['survey_type'] == '0') {
-    if ($survey_data['show_form_profile'] == 0) {
+if ('0' == $survey_data['survey_type']) {
+    if (0 == $survey_data['show_form_profile']) {
         // The normal survey as always
         if ($show < $numberOfPages) {
-            if ($show == 0) {
+            if (0 == $show) {
                 $form->addButton(
                     'next_survey_page',
                     get_lang('Start the Survey'),
@@ -1306,7 +1304,7 @@ if ($survey_data['survey_type'] == '0') {
         if (isset($_GET['show'])) {
             $numberOfPages = count($paged_questions);
             if ($show < $numberOfPages) {
-                if ($show == 0) {
+                if (0 == $show) {
                     $form->addButton(
                         'next_survey_page',
                         get_lang('Start the Survey'),
@@ -1333,7 +1331,7 @@ if ($survey_data['survey_type'] == '0') {
             }
         }
     }
-} elseif ($survey_data['survey_type'] == '1') {
+} elseif ('1' == $survey_data['survey_type']) {
     // Conditional/personality-test type survey
     if (isset($_GET['show']) || isset($_POST['personality'])) {
         $numberOfPages = count($paged_questions);
@@ -1346,10 +1344,10 @@ if ($survey_data['survey_type'] == '0') {
             $paged_questions_sec = [];
         }
 
-        if ($personality == 0) {
+        if (0 == $personality) {
             if (($show <= $numberOfPages) || !$_GET['show']) {
                 $form->addButton('next_survey_page', get_lang('Next'), 'arrow-right', 'success');
-                if ($survey_data['one_question_per_page'] == 0) {
+                if (0 == $survey_data['one_question_per_page']) {
                     if ($personality >= 0) {
                         $form->addHidden('personality', $personality);
                     }
@@ -1365,10 +1363,10 @@ if ($survey_data['survey_type'] == '0') {
             }
         }
 
-        if ($show > $numberOfPages && $_GET['show'] && $personality == 0) {
+        if ($show > $numberOfPages && $_GET['show'] && 0 == $personality) {
             $form->addHidden('personality', $personality);
         } elseif ($personality > 0) {
-            if ($survey_data['one_question_per_page'] == 1) {
+            if (1 == $survey_data['one_question_per_page']) {
                 if ($show >= $numberOfPages) {
                     $form->addButton('finish_survey', get_lang('Finish survey'), 'arrow-right', 'success');
                 } else {
@@ -1380,7 +1378,7 @@ if ($survey_data['survey_type'] == '0') {
                 $form->addButton('finish_survey', get_lang('Finish survey'), 'arrow-right');
             }
         }
-    } elseif ($survey_data['form_fields'] == '') {
+    } elseif ('' == $survey_data['form_fields']) {
         // This is the case when the show_profile_form is true but there are not form_fields
         $form->addButton('next_survey_page', get_lang('Next'), 'arrow-right', 'success');
     } elseif (!is_array($user_data)) {
diff --git a/public/main/survey/meeting.php b/public/main/survey/meeting.php
index 5e14fff3ff..4553af79e1 100644
--- a/public/main/survey/meeting.php
+++ b/public/main/survey/meeting.php
@@ -166,7 +166,7 @@ foreach ($questions as $item) {
     $questionsWithAnswer = 0;
     if (isset($answerList[$questionId])) {
         foreach ($answerList[$questionId] as $userAnswer) {
-            if ((int) $userAnswer === 1) {
+            if (1 === (int) $userAnswer) {
                 $questionsWithAnswer++;
             }
         }
@@ -189,7 +189,7 @@ foreach ($students as $studentId) {
     $userInfo = api_get_user_info($studentId);
     $name = $userInfo['complete_name'];
     if ($userId == $studentId) {
-        if ($action !== 'edit') {
+        if ('edit' !== $action) {
             $name .= Display::url(
                 Display::return_icon('edit.png', get_lang('Edit')),
                 $urlEdit
@@ -204,15 +204,15 @@ foreach ($students as $studentId) {
                 if (empty($answerList[$item['question_id']][$studentId])) {
                     $checked = $notAvailableIcon;
                 }
-                if ($action === 'edit') {
+                if ('edit' === $action) {
                     $checked = '';
-                    if ($answerList[$item['question_id']][$studentId] == 1) {
+                    if (1 == $answerList[$item['question_id']][$studentId]) {
                         $checked = 'checked';
                     }
                 }
             }
 
-            if ($action === 'edit') {
+            if ('edit' === $action) {
                 $html = '<div class="alert alert-info"><input 
                     id="'.$item['question_id'].'" 
                     name="options['.$item['question_id'].']" 
@@ -252,13 +252,13 @@ foreach ($students as $studentId) {
     $table->setCellContents($row, $column, $name);
     $row++;
 }
-if ($action === 'edit') {
+if ('edit' === $action) {
     $content .= '<form name="meeting" action="'.$urlEdit.'" method="post">';
 }
 
 $content .= $table->toHtml();
 
-if ($action === 'edit') {
+if ('edit' === $action) {
     $content .= '<div class="pull-right">
         <button name="submit" type="submit" class="btn btn-primary btn-lg">'.get_lang('Save').'</button></div>';
     $content .= '</form>';
diff --git a/public/main/survey/preview.php b/public/main/survey/preview.php
index 8c37f3707e..8fb4875467 100644
--- a/public/main/survey/preview.php
+++ b/public/main/survey/preview.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.survey
- *
  * @author  Patrick Cool <patrick.cool@UGent.be>, Ghent University
  * @author  Julio Montoya <gugli100@gmail.com>
  */
@@ -93,14 +91,14 @@ if (isset($_GET['show'])) {
     $questions_exists = true;
     if (Database::num_rows($result)) {
         while ($row = Database::fetch_array($result)) {
-            if ($survey_data['one_question_per_page'] == 1) {
-                if ($row['type'] != 'pagebreak') {
+            if (1 == $survey_data['one_question_per_page']) {
+                if ('pagebreak' != $row['type']) {
                     $paged_questions[$counter][] = $row['question_id'];
                     $counter++;
                     continue;
                 }
             } else {
-                if ($row['type'] == 'pagebreak') {
+                if ('pagebreak' == $row['type']) {
                     $counter++;
                 } else {
                     $paged_questions[$counter][] = $row['question_id'];
@@ -139,7 +137,7 @@ if (isset($_GET['show'])) {
         $result = Database::query($sql);
         while ($row = Database::fetch_array($result)) {
             // If the type is not a pagebreak we store it in the $questions array
-            if ($row['type'] != 'pagebreak') {
+            if ('pagebreak' != $row['type']) {
                 $sort = $row['sort'];
                 $questions[$sort]['question_id'] = $row['question_id'];
                 $questions[$sort]['survey_id'] = $row['survey_id'];
@@ -197,7 +195,7 @@ if (is_array($questions) && count($questions) > 0) {
 $form->addHtml('<div class="start-survey">');
 
 if ($show < $numberOfPages) {
-    if ($show == 0) {
+    if (0 == $show) {
         $form->addButton(
             'next_survey_page',
             get_lang('Start the Survey'),
@@ -215,8 +213,8 @@ if ($show < $numberOfPages) {
 }
 
 if (isset($_GET['show'])) {
-    if ($show >= $numberOfPages || count($questions) == 0) {
-        if ($questions_exists == false) {
+    if ($show >= $numberOfPages || 0 == count($questions)) {
+        if (false == $questions_exists) {
             echo '<p>'.get_lang('There are not questions for this survey').'</p>';
         }
         $form->addButton(
diff --git a/public/main/survey/question.php b/public/main/survey/question.php
index 3a56e5e9ae..2c90149b40 100644
--- a/public/main/survey/question.php
+++ b/public/main/survey/question.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.survey
- *
  * @author unknown, the initial survey that did not make it in 1.8 because of bad code
  * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University: cleanup,
  * refactoring and rewriting large parts of the code
@@ -36,13 +34,13 @@ if (api_strlen(strip_tags($surveyData['title'])) > 40) {
     $urlname .= '...';
 }
 
-if ($surveyData['survey_type'] == 1) {
+if (1 == $surveyData['survey_type']) {
     $sql = 'SELECT id FROM '.Database::get_course_table(TABLE_SURVEY_QUESTION_GROUP).'
             WHERE
                 c_id = '.$course_id.' AND
                 survey_id = '.(int) $_GET['survey_id'].' LIMIT 1';
     $rs = Database::query($sql);
-    if (Database::num_rows($rs) === 0) {
+    if (0 === Database::num_rows($rs)) {
         Display::addFlash(
             Display::return_message(get_lang('You need to create groups'))
         );
@@ -62,10 +60,10 @@ $interbreadcrumb[] = [
 ];
 
 // Tool name
-if ($_GET['action'] == 'add') {
+if ('add' == $_GET['action']) {
     $tool_name = get_lang('Add a question');
 }
-if ($_GET['action'] == 'edit') {
+if ('edit' == $_GET['action']) {
     $tool_name = get_lang('Edit question');
 }
 
diff --git a/public/main/survey/reporting.php b/public/main/survey/reporting.php
index 2f1ce6b4b5..c8f8018847 100644
--- a/public/main/survey/reporting.php
+++ b/public/main/survey/reporting.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.survey
- *
  * @author unknown, the initial survey that did not make it in 1.8 because of bad code
  * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University: cleanup,
  * refactoring and rewriting large parts of the code
@@ -22,7 +20,7 @@ if (empty($survey_data)) {
     api_not_allowed(true);
 }
 
-if ($survey_data['anonymous'] == 0) {
+if (0 == $survey_data['anonymous']) {
     $people_filled_full_data = true;
 } else {
     $people_filled_full_data = false;
@@ -43,7 +41,7 @@ $isDrhOfCourse = CourseManager::isUserSubscribedInCourseAsDrh(
 /** @todo this has to be moved to a more appropriate place (after the display_header of the code)*/
 if (!api_is_allowed_to_edit(false, true) || $isDrhOfCourse) {
     // Show error message if the survey can be seen only by tutors
-    if ($survey_data['visible_results'] == SURVEY_VISIBLE_TUTOR) {
+    if (SURVEY_VISIBLE_TUTOR == $survey_data['visible_results']) {
         api_not_allowed(true);
     }
 
@@ -107,7 +105,7 @@ $interbreadcrumb[] = [
     'name' => $urlname,
 ];
 
-if ($action == 'overview') {
+if ('overview' == $action) {
     $tool_name = get_lang('Reporting');
 } else {
     $interbreadcrumb[] = [
@@ -138,7 +136,7 @@ Display::display_header($tool_name, 'Survey');
 SurveyUtil::handle_reporting_actions($survey_data, $people_filled);
 
 // Content
-if ($action == 'overview') {
+if ('overview' == $action) {
     $html = null;
     $url = api_get_path(WEB_CODE_PATH).'survey/reporting.php?'.api_get_cidreq().'&';
 
diff --git a/public/main/survey/survey.download.inc.php b/public/main/survey/survey.download.inc.php
index 275e2a791d..bfde6d1fcd 100644
--- a/public/main/survey/survey.download.inc.php
+++ b/public/main/survey/survey.download.inc.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.survey
- *
  * @author Arnaud Ligot <arnaud@cblue.be>
  *
  * A small peace of code to enable user to access images included into survey
@@ -36,7 +34,7 @@ function check_download_survey($course, $invitation, $doc_url)
     $survey_invitation = Database::fetch_assoc($result);
 
     // Now we check if the user already filled the survey
-    if ($survey_invitation['answered'] == 1) {
+    if (1 == $survey_invitation['answered']) {
         echo Display::return_message(get_lang('You already filled this survey'), 'error', false);
         Display::display_footer();
         exit;
@@ -99,7 +97,7 @@ function check_download_survey($course, $invitation, $doc_url)
                         option_text LIKE '%$doc_url%'
                     )";
     $result = Database::query($sql);
-    if (Database::num_rows($result) == 0) {
+    if (0 == Database::num_rows($result)) {
         echo Display::return_message(get_lang('Wrong invitation code'), 'error', false);
         Display::display_footer();
         exit;
diff --git a/public/main/survey/survey.lib.php b/public/main/survey/survey.lib.php
index e716cf620e..d92c204b44 100644
--- a/public/main/survey/survey.lib.php
+++ b/public/main/survey/survey.lib.php
@@ -9,8 +9,6 @@ use Chamilo\CourseBundle\Entity\CSurveyQuestionOption;
 /**
  * Class SurveyManager.
  *
- * @package chamilo.survey
- *
  * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University:
  * cleanup, refactoring and rewriting large parts (if not all) of the code
  * @author Julio Montoya <gugli100@gmail.com>, Personality Test modification
@@ -152,7 +150,7 @@ class SurveyManager
         $survey_id = (int) $survey_id;
         $table_survey = Database::get_course_table(TABLE_SURVEY);
 
-        if ($shared != 0) {
+        if (0 != $shared) {
             $table_survey = Database::get_main_table(TABLE_MAIN_SHARED_SURVEY_QUESTION);
             $sql = "SELECT * FROM $table_survey
                     WHERE survey_id='".$survey_id."' ";
@@ -261,18 +259,18 @@ class SurveyManager
             $survey = new CSurvey();
 
             $extraParams = [];
-            if ($values['anonymous'] == 0) {
+            if (0 == $values['anonymous']) {
                 // Input_name_list
                 $values['show_form_profile'] = isset($values['show_form_profile']) ? $values['show_form_profile'] : 0;
                 $survey->setShowFormProfile($values['show_form_profile']);
 
-                if ($values['show_form_profile'] == 1) {
+                if (1 == $values['show_form_profile']) {
                     // Input_name_list
                     $fields = explode(',', $values['input_name_list']);
                     $field_values = '';
                     foreach ($fields as &$field) {
-                        if ($field != '') {
-                            if ($values[$field] == '') {
+                        if ('' != $field) {
+                            if ('' == $values[$field]) {
                                 $values[$field] = 0;
                             }
                             $field_values .= $field.':'.$values[$field].'@';
@@ -291,7 +289,7 @@ class SurveyManager
             $extraParams['one_question_per_page'] = isset($values['one_question_per_page']) ? $values['one_question_per_page'] : 0;
             $extraParams['shuffle'] = isset($values['shuffle']) ? $values['shuffle'] : 0;
 
-            if ($values['survey_type'] == 1) {
+            if (1 == $values['survey_type']) {
                 $survey
                     ->setSurveyType(1)
                     ->setShuffle($values['shuffle'])
@@ -309,7 +307,7 @@ class SurveyManager
                             ORDER BY survey_version DESC
                             LIMIT 1';
                     $rs = Database::query($sql);
-                    if (Database::num_rows($rs) === 0) {
+                    if (0 === Database::num_rows($rs)) {
                         $sql = 'SELECT survey_version FROM '.$table_survey.'
 						        WHERE
 						            c_id = '.$course_id.' AND
@@ -324,7 +322,7 @@ class SurveyManager
                     } else {
                         $row = Database::fetch_array($rs, 'ASSOC');
                         $pos = api_strpos($row['survey_version']);
-                        if ($pos === false) {
+                        if (false === $pos) {
                             $row['survey_version'] = $row['survey_version'] + 1;
                             $versionValue = $row['survey_version'];
                         } else {
@@ -332,7 +330,7 @@ class SurveyManager
                             $lastversion = array_pop($getlast);
                             $lastversion = $lastversion + 1;
                             $add = implode('.', $getlast);
-                            if ($add != '') {
+                            if ('' != $add) {
                                 $insertnewversion = $add.'.'.$lastversion;
                             } else {
                                 $insertnewversion = $lastversion;
@@ -389,7 +387,7 @@ class SurveyManager
                 );
             }
 
-            if ($values['survey_type'] == 1 && !empty($values['parent_id'])) {
+            if (1 == $values['survey_type'] && !empty($values['parent_id'])) {
                 self::copy_survey($values['parent_id'], $survey_id);
             }
 
@@ -423,7 +421,7 @@ class SurveyManager
             }
 
             if (!isset($values['anonymous'])
-                || (isset($values['anonymous']) && $values['anonymous'] == '')
+                || (isset($values['anonymous']) && '' == $values['anonymous'])
             ) {
                 $values['anonymous'] = 0;
             }
@@ -432,15 +430,15 @@ class SurveyManager
             $extraParams['one_question_per_page'] = isset($values['one_question_per_page']) ? $values['one_question_per_page'] : 0;
             $extraParams['shuffle'] = isset($values['shuffle']) ? $values['shuffle'] : 0;
 
-            if ($values['anonymous'] == 0) {
+            if (0 == $values['anonymous']) {
                 $extraParams['show_form_profile'] = isset($values['show_form_profile']) ? $values['show_form_profile'] : 0;
-                if ($extraParams['show_form_profile'] == 1) {
+                if (1 == $extraParams['show_form_profile']) {
                     $fields = explode(',', $values['input_name_list']);
                     $field_values = '';
                     foreach ($fields as &$field) {
-                        if ($field != '') {
+                        if ('' != $field) {
                             if (!isset($values[$field]) ||
-                                (isset($values[$field]) && $values[$field] == '')
+                                (isset($values[$field]) && '' == $values[$field])
                             ) {
                                 $values[$field] = 0;
                             }
@@ -582,7 +580,7 @@ class SurveyManager
 
         if (!$values['survey_id'] ||
             !is_numeric($values['survey_id']) ||
-            $values['survey_share']['survey_share'] == 'true'
+            'true' == $values['survey_share']['survey_share']
         ) {
             $sql = "INSERT INTO $table_survey (code, title, subtitle, author, lang, template, intro, surveythanks, creation_date, course_code) VALUES (
                     '".Database::escape_string($values['survey_code'])."',
@@ -845,7 +843,7 @@ class SurveyManager
 
         $datas = self::get_survey($surveyId);
         $session_where = '';
-        if (api_get_session_id() != 0) {
+        if (0 != api_get_session_id()) {
             $session_where = ' AND session_id = "'.api_get_session_id().'" ';
         }
 
@@ -1028,7 +1026,7 @@ class SurveyManager
             ? $row['is_required']
             : false;
 
-        if ($row['survey_group_pri'] != 0) {
+        if (0 != $row['survey_group_pri']) {
             $return['assigned'] = $row['survey_group_pri'];
             $return['choose'] = 1;
         } else {
@@ -1124,14 +1122,14 @@ class SurveyManager
             // Checks length of the question
             $empty_answer = false;
 
-            if ($survey_data['survey_type'] == 1) {
+            if (1 == $survey_data['survey_type']) {
                 if (empty($form_content['choose'])) {
                     $return_message = 'PleaseChooseACondition';
 
                     return $return_message;
                 }
 
-                if (($form_content['choose'] == 2) &&
+                if ((2 == $form_content['choose']) &&
                     ($form_content['assigned1'] == $form_content['assigned2'])
                 ) {
                     $return_message = 'ChooseDifferentCategories';
@@ -1140,7 +1138,7 @@ class SurveyManager
                 }
             }
 
-            if ($form_content['type'] != 'percentage') {
+            if ('percentage' != $form_content['type']) {
                 if (isset($form_content['answers'])) {
                     for ($i = 0; $i < count($form_content['answers']); $i++) {
                         if (strlen($form_content['answers'][$i]) < 1) {
@@ -1151,7 +1149,7 @@ class SurveyManager
                 }
             }
 
-            if ($form_content['type'] == 'score') {
+            if ('score' == $form_content['type']) {
                 if (strlen($form_content['maximum_score']) < 1) {
                     $empty_answer = true;
                 }
@@ -1165,13 +1163,13 @@ class SurveyManager
                 $survey_data = self::get_survey($form_content['survey_id']);
 
                 // Storing the question in the shared database
-                if (is_numeric($survey_data['survey_share']) && $survey_data['survey_share'] != 0) {
+                if (is_numeric($survey_data['survey_share']) && 0 != $survey_data['survey_share']) {
                     $shared_question_id = self::save_shared_question($form_content, $survey_data);
                     $form_content['shared_question_id'] = $shared_question_id;
                 }
 
                 // Storing a new question
-                if ($form_content['question_id'] == '' || !is_numeric($form_content['question_id'])) {
+                if ('' == $form_content['question_id'] || !is_numeric($form_content['question_id'])) {
                     // Finding the max sort order of the questions in the given survey
                     $sql = "SELECT max(sort) AS max_sort
 					        FROM $tbl_survey_question
@@ -1185,9 +1183,9 @@ class SurveyManager
                     // Some variables defined for survey-test type
                     $extraParams = [];
                     if (isset($_POST['choose'])) {
-                        if ($_POST['choose'] == 1) {
+                        if (1 == $_POST['choose']) {
                             $question->setSurveyGroupPri($_POST['assigned']);
-                        } elseif ($_POST['choose'] == 2) {
+                        } elseif (2 == $_POST['choose']) {
                             $question->setSurveyGroupSec1($_POST['assigned1']);
                             $question->setSurveyGroupSec2($_POST['assigned2']);
                         }
@@ -1226,11 +1224,11 @@ class SurveyManager
                     // Updating an existing question
                     $extraParams = [];
                     if (isset($_POST['choose'])) {
-                        if ($_POST['choose'] == 1) {
+                        if (1 == $_POST['choose']) {
                             $extraParams['survey_group_pri'] = $_POST['assigned'];
                             $extraParams['survey_group_sec1'] = 0;
                             $extraParams['survey_group_sec2'] = 0;
-                        } elseif ($_POST['choose'] == 2) {
+                        } elseif (2 == $_POST['choose']) {
                             $extraParams['survey_group_pri'] = 0;
                             $extraParams['survey_group_sec1'] = $_POST['assigned1'];
                             $extraParams['survey_group_sec2'] = $_POST['assigned2'];
@@ -1316,7 +1314,7 @@ class SurveyManager
         $tbl_survey_question = Database::get_main_table(TABLE_MAIN_SHARED_SURVEY_QUESTION);
 
         // Storing a new question
-        if ($form_content['shared_question_id'] == '' ||
+        if ('' == $form_content['shared_question_id'] ||
             !is_numeric($form_content['shared_question_id'])
         ) {
             // Finding the max sort order of the questions in the given survey
@@ -1375,10 +1373,10 @@ class SurveyManager
         $table_survey_question = Database::get_course_table(TABLE_SURVEY_QUESTION);
         $course_id = api_get_course_int_id();
 
-        if ($direction == 'moveup') {
+        if ('moveup' == $direction) {
             $sort = 'DESC';
         }
-        if ($direction == 'movedown') {
+        if ('movedown' == $direction) {
             $sort = 'ASC';
         }
 
@@ -1537,13 +1535,13 @@ class SurveyManager
     {
         $course_id = api_get_course_int_id();
         // A percentage question type has options 1 -> 100
-        if ($form_content['type'] === 'percentage') {
+        if ('percentage' === $form_content['type']) {
             for ($i = 1; $i < 101; $i++) {
                 $form_content['answers'][] = $i;
             }
         }
 
-        if (is_numeric($survey_data['survey_share']) && $survey_data['survey_share'] != 0) {
+        if (is_numeric($survey_data['survey_share']) && 0 != $survey_data['survey_share']) {
             self::save_shared_question_options($form_content, $survey_data);
         }
 
@@ -1908,7 +1906,7 @@ class SurveyManager
      */
     public static function protectByMandatory()
     {
-        if (strpos($_SERVER['SCRIPT_NAME'], 'fillsurvey.php') !== false) {
+        if (false !== strpos($_SERVER['SCRIPT_NAME'], 'fillsurvey.php')) {
             return;
         }
 
@@ -2161,7 +2159,7 @@ class SurveyManager
         $questions = self::get_questions($surveyId);
         foreach ($questions as $question) {
             // Questions marked with "geneated" were created using the "multiplicate" feature.
-            if ($question['survey_question_comment'] === 'generated') {
+            if ('generated' === $question['survey_question_comment']) {
                 self::delete_survey_question($surveyId, $question['question_id']);
             }
         }
@@ -2203,7 +2201,7 @@ class SurveyManager
                 }
 
                 $text = $question['question'];
-                if (strpos($text, $classTag) !== false) {
+                if (false !== strpos($text, $classTag)) {
                     $replacedText = str_replace($classTag, $className, $text);
                     $values = [
                         'c_id' => $courseId,
@@ -2223,7 +2221,7 @@ class SurveyManager
                 foreach ($users as $userId) {
                     $userInfo = api_get_user_info($userId);
 
-                    if (strpos($text, $studentTag) !== false) {
+                    if (false !== strpos($text, $studentTag)) {
                         $replacedText = str_replace($studentTag, $userInfo['complete_name'], $text);
                         $values = [
                             'c_id' => $courseId,
@@ -2303,7 +2301,7 @@ class SurveyManager
         $result = Database::query($sql);
         $countOfQuestions = Database::result($result, 0, 0);
 
-        if ($survey['one_question_per_page'] == 1) {
+        if (1 == $survey['one_question_per_page']) {
             if (!empty($countOfQuestions)) {
                 return $countOfQuestions;
             }
@@ -2494,7 +2492,7 @@ class SurveyManager
                     );
                 }
 
-                if (!empty($answered) && $surveyData['anonymous'] == 0) {
+                if (!empty($answered) && 0 == $surveyData['anonymous']) {
                     $answers = SurveyUtil::displayCompleteReport(
                         $surveyData,
                         $userId,
diff --git a/public/main/survey/survey.php b/public/main/survey/survey.php
index 34184c6e08..b0439de161 100644
--- a/public/main/survey/survey.php
+++ b/public/main/survey/survey.php
@@ -4,8 +4,6 @@
 use ChamiloSession as Session;
 
 /**
- * @package chamilo.survey
- *
  * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University:
  * cleanup, refactoring and rewriting large parts of the code
  * @author Julio Montoya
@@ -30,7 +28,7 @@ if ($isDrhOfCourse) {
     exit;
 }
 if (!api_is_allowed_to_edit(false, true) ||
-    (api_is_session_general_coach() && $extend_rights_for_coachs == 'false')
+    (api_is_session_general_coach() && 'false' == $extend_rights_for_coachs)
 ) {
     api_not_allowed(true);
     exit;
@@ -54,7 +52,7 @@ $interbreadcrumb[] = [
 // Getting the survey information
 if (!empty($_GET['survey_id'])) {
     $course_code = api_get_course_id();
-    if ($course_code != -1) {
+    if (-1 != $course_code) {
         $survey_data = SurveyManager::get_survey($survey_id);
     } else {
         api_not_allowed(true);
@@ -64,15 +62,15 @@ if (!empty($_GET['survey_id'])) {
 }
 
 $tool_name = strip_tags($survey_data['title'], '<span>');
-$is_survey_type_1 = $survey_data['survey_type'] == 1;
+$is_survey_type_1 = 1 == $survey_data['survey_type'];
 
 if (api_strlen(strip_tags($survey_data['title'])) > 40) {
     $tool_name .= '...';
 }
 
-if ($is_survey_type_1 && ($action == 'addgroup' || $action == 'deletegroup')) {
+if ($is_survey_type_1 && ('addgroup' == $action || 'deletegroup' == $action)) {
     $_POST['name'] = trim($_POST['name']);
-    if ($action == 'addgroup') {
+    if ('addgroup' == $action) {
         if (!empty($_POST['group_id'])) {
             Database::query('UPDATE '.$table_survey_question_group.' SET description = \''.Database::escape_string($_POST['description']).'\'
                              WHERE c_id = '.$course_id.' AND id = \''.Database::escape_string($_POST['group_id']).'\'');
@@ -85,7 +83,7 @@ if ($is_survey_type_1 && ($action == 'addgroup' || $action == 'deletegroup')) {
         }
     }
 
-    if ($action == 'deletegroup') {
+    if ('deletegroup' == $action) {
         $sql = 'DELETE FROM '.$table_survey_question_group.' 
                 WHERE c_id = '.$course_id.' AND id = '.intval($_GET['gid']).' AND survey_id = '.$survey_id;
         Database::query($sql);
@@ -106,7 +104,7 @@ $my_question_id_survey = isset($_GET['question_id']) ? Security::remove_XSS($_GE
 $my_survey_id_survey = Security::remove_XSS($_GET['survey_id']);
 
 if (isset($action)) {
-    if (($action == 'moveup' || $action == 'movedown') && isset($_GET['question_id'])) {
+    if (('moveup' == $action || 'movedown' == $action) && isset($_GET['question_id'])) {
         SurveyManager::move_survey_question(
             $my_action_survey,
             $my_question_id_survey,
@@ -114,7 +112,7 @@ if (isset($action)) {
         );
         echo Display::return_message(get_lang('The question has been moved'), 'confirmation');
     }
-    if ($action == 'delete' && is_numeric($_GET['question_id'])) {
+    if ('delete' == $action && is_numeric($_GET['question_id'])) {
         SurveyManager::delete_survey_question(
             $my_survey_id_survey,
             $my_question_id_survey,
@@ -132,7 +130,7 @@ SurveyUtil::check_first_last_question($_GET['survey_id']);
 
 // Action links
 $survey_actions = '';
-if ($survey_data['survey_type'] != 3) {
+if (3 != $survey_data['survey_type']) {
     $survey_actions = '<a href="'.api_get_path(WEB_CODE_PATH).'survey/create_new_survey.php?'.api_get_cidreq(
         ).'&action=edit&survey_id='.$survey_id.'">'.
         Display::return_icon('edit.png', get_lang('Edit survey'), '', ICON_SIZE_MEDIUM).'</a>';
@@ -140,7 +138,7 @@ if ($survey_data['survey_type'] != 3) {
 $survey_actions .= '<a href="'.api_get_path(WEB_CODE_PATH).'survey/survey_list.php?'.api_get_cidreq().'&action=delete&survey_id='.$survey_id.'" onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang('Delete survey').'?', ENT_QUOTES)).'\')) return false;">'.
     Display::return_icon('delete.png', get_lang('Delete survey'), '', ICON_SIZE_MEDIUM).'</a>';
 
-if ($survey_data['survey_type'] != 3) {
+if (3 != $survey_data['survey_type']) {
     $survey_actions .= '<a href="'.api_get_path(WEB_CODE_PATH).'survey/preview.php?'.api_get_cidreq().'&survey_id='.$survey_id.'">'.
         Display::return_icon('preview_view.png', get_lang('Preview'), '', ICON_SIZE_MEDIUM).'</a>';
 }
@@ -148,7 +146,7 @@ if ($survey_data['survey_type'] != 3) {
 $survey_actions .= '<a href="'.api_get_path(WEB_CODE_PATH).'survey/survey_invite.php?'.api_get_cidreq().'&survey_id='.$survey_id.'">'.
     Display::return_icon('mail_send.png', get_lang('Publish'), '', ICON_SIZE_MEDIUM).'</a>';
 
-if ($survey_data['survey_type'] != 3) {
+if (3 != $survey_data['survey_type']) {
     if (!api_get_configuration_value('hide_survey_reporting_button')) {
         $survey_actions .= Display::url(
             Display::return_icon('statistics.png', get_lang('Reporting'), [], ICON_SIZE_MEDIUM),
@@ -162,7 +160,7 @@ $survey_actions .= SurveyUtil::getAdditionalTeacherActions($survey_id, ICON_SIZE
 echo '<div class="actions">'.$survey_actions.'</div>';
 
 $urlQuestion = api_get_path(WEB_CODE_PATH).'survey/question.php?'.api_get_cidreq().'&action=add';
-if ($survey_data['survey_type'] == 0) {
+if (0 == $survey_data['survey_type']) {
     echo '<div class="well">';
     echo Display::url(
         Display::return_icon('yesno.png', get_lang('Yes / No'), null, ICON_SIZE_BIG),
@@ -197,7 +195,7 @@ if ($survey_data['survey_type'] == 0) {
         $urlQuestion.'&type=comment&survey_id='.$survey_id
     );
 
-    if ($survey_data['one_question_per_page'] == 0) {
+    if (0 == $survey_data['one_question_per_page']) {
         echo Display::url(
             Display::return_icon('page_end.png', get_lang('Page end (distinct questions)'), null, ICON_SIZE_BIG),
             $urlQuestion.'&type=pagebreak&survey_id='.$survey_id
@@ -205,7 +203,7 @@ if ($survey_data['survey_type'] == 0) {
     }
     echo '</div>';
 } else {
-    if ($survey_data['survey_type'] != 3) {
+    if (3 != $survey_data['survey_type']) {
         echo '<div class="well">';
         echo Display::url(
             Display::return_icon('yesno.png', get_lang('Yes / No'), null, ICON_SIZE_BIG),
@@ -260,7 +258,7 @@ while ($row = Database::fetch_array($result, 'ASSOC')) {
     echo '	<td>'.$question_counter.'</td>';
     echo '	<td>';
 
-    if ($survey_data['survey_type'] != 3) {
+    if (3 != $survey_data['survey_type']) {
         if (api_strlen($row['survey_question']) > 100) {
             echo api_substr(strip_tags($row['survey_question']), 0, 100).' ... ';
         } else {
@@ -271,9 +269,9 @@ while ($row = Database::fetch_array($result, 'ASSOC')) {
         echo api_get_local_time($parts[0]).' - '.api_get_local_time($parts[1]);
     }
 
-    if ($row['type'] == 'yesno') {
+    if ('yesno' == $row['type']) {
         $tool_name = get_lang('Yes / No');
-    } elseif ($row['type'] == 'multiplechoice') {
+    } elseif ('multiplechoice' == $row['type']) {
         $tool_name = get_lang('Multiple choice');
     } else {
         $tool_name = get_lang(api_ucfirst(Security::remove_XSS($row['type'])));
@@ -283,14 +281,14 @@ while ($row = Database::fetch_array($result, 'ASSOC')) {
     echo '<td>'.$tool_name.'</td>';
     echo '<td>'.$row['number_of_options'].'</td>';
     echo '<td>';
-    if ($survey_data['survey_type'] != 3) {
+    if (3 != $survey_data['survey_type']) {
         echo '<a href="'.api_get_path(WEB_CODE_PATH).'survey/question.php?'.api_get_cidreq().'&action=edit&type='.$row['type'].'&survey_id='.$survey_id.'&question_id='.$row['question_id'].'">'.
             Display::return_icon('edit.png', get_lang('Edit'), '', ICON_SIZE_SMALL).'</a>';
     }
 
     echo '<a href="'.api_get_path(WEB_CODE_PATH).'survey/survey.php?'.api_get_cidreq().'&action=delete&survey_id='.$survey_id.'&question_id='.$row['question_id'].'" onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang("Delete surveyQuestion").'?', ENT_QUOTES, $charset)).'\')) return false;">'.
         Display::return_icon('delete.png', get_lang('Delete'), '', ICON_SIZE_SMALL).'</a>';
-    if ($survey_data['survey_type'] != 3) {
+    if (3 != $survey_data['survey_type']) {
         if ($question_counter > 1) {
             echo '<a href="'.api_get_path(WEB_CODE_PATH).'survey/survey.php?'.api_get_cidreq(
                 ).'&action=moveup&survey_id='.$survey_id.'&question_id='.$row['question_id'].'">'.
@@ -310,8 +308,8 @@ while ($row = Database::fetch_array($result, 'ASSOC')) {
     $question_counter++;
 
     if ($is_survey_type_1) {
-        echo '<td>'.(($row['survey_group_pri'] == 0) ? get_lang('Secondary') : get_lang('Primary')).'</td>';
-        echo '<td>'.(($row['survey_group_pri'] == 0) ? $groups[$row['survey_group_sec1']].'-'.$groups[$row['survey_group_sec2']] : $groups[$row['survey_group_pri']]).'</td>';
+        echo '<td>'.((0 == $row['survey_group_pri']) ? get_lang('Secondary') : get_lang('Primary')).'</td>';
+        echo '<td>'.((0 == $row['survey_group_pri']) ? $groups[$row['survey_group_sec1']].'-'.$groups[$row['survey_group_sec2']] : $groups[$row['survey_group_pri']]).'</td>';
     }
     echo '</tr>';
 }
@@ -341,7 +339,7 @@ if ($is_survey_type_1) {
     }
     echo '<table border="0"><tr><td width="100">'.get_lang('Name').'</td><td>'.get_lang('Description').'</td></tr></table>';
     echo '<form action="'.api_get_path(WEB_CODE_PATH).'survey/survey.php?action=addgroup&survey_id='.$survey_id.'" method="post">';
-    if ($_GET['action'] == 'editgroup') {
+    if ('editgroup' == $_GET['action']) {
         $sql = 'SELECT name,description FROM '.$table_survey_question_group.' 
                 WHERE id = '.intval($_GET['gid']).' AND survey_id = '.$survey_id.' limit 1';
         $rs = Database::query($sql);
diff --git a/public/main/survey/surveyUtil.class.php b/public/main/survey/surveyUtil.class.php
index d2443f6fd2..b0511c2b8e 100644
--- a/public/main/survey/surveyUtil.class.php
+++ b/public/main/survey/surveyUtil.class.php
@@ -36,11 +36,11 @@ class SurveyUtil
         $counter = 1;
         $error = false;
         while ($row = Database::fetch_array($result, 'ASSOC')) {
-            if ($counter == 1 && $row['type'] == 'pagebreak') {
+            if (1 == $counter && 'pagebreak' == $row['type']) {
                 echo Display::return_message(get_lang('The page break cannot be the first'), 'error', false);
                 $error = true;
             }
-            if ($counter == $total && $row['type'] == 'pagebreak') {
+            if ($counter == $total && 'pagebreak' == $row['type']) {
                 echo Display::return_message(get_lang('The page break cannot be the last one'), 'error', false);
                 $error = true;
             }
@@ -112,7 +112,7 @@ class SurveyUtil
         $table_survey_answer = Database::get_course_table(TABLE_SURVEY_ANSWER);
 
         // Make the survey anonymous
-        if ($survey_data['anonymous'] == 1) {
+        if (1 == $survey_data['anonymous']) {
             $surveyUser = Session::read('surveyuser');
             if (empty($surveyUser)) {
                 $user = md5($user.time());
@@ -181,8 +181,8 @@ class SurveyUtil
         }
 
         // User report
-        if (isset($_GET['action']) && $_GET['action'] == 'userreport') {
-            if ($survey_data['anonymous'] == 0) {
+        if (isset($_GET['action']) && 'userreport' == $_GET['action']) {
+            if (0 == $survey_data['anonymous']) {
                 foreach ($people_filled as $key => &$value) {
                     $people_filled_userids[] = $value['invited_user'];
                 }
@@ -196,7 +196,7 @@ class SurveyUtil
         }
 
         // Question report
-        if (isset($_GET['action']) && $_GET['action'] == 'questionreport') {
+        if (isset($_GET['action']) && 'questionreport' == $_GET['action']) {
             if (isset($_GET['question']) && !is_numeric($_GET['question'])) {
                 $error = get_lang('Unknown question');
             }
@@ -237,11 +237,11 @@ class SurveyUtil
         $temp_questions_data = SurveyManager::get_questions($_GET['survey_id']);
 
         // Sorting like they should be displayed and removing the non-answer question types (comment and pagebreak)
-        $my_temp_questions_data = $temp_questions_data == null ? [] : $temp_questions_data;
+        $my_temp_questions_data = null == $temp_questions_data ? [] : $temp_questions_data;
         $questions_data = [];
 
         foreach ($my_temp_questions_data as $key => &$value) {
-            if ($value['type'] != 'pagebreak') {
+            if ('pagebreak' != $value['type']) {
                 $questions_data[$value['sort']] = $value;
             }
         }
@@ -307,7 +307,7 @@ class SurveyUtil
             $result = Database::query($sql);
         }
 
-        if ($result !== false) {
+        if (false !== $result) {
             $message = get_lang('The user\'s answers to the survey have been succesfully removed.').'<br />
 					<a href="'.api_get_path(WEB_CODE_PATH).'survey/reporting.php?action=userreport&survey_id='
                 .$survey_id.'">'.
@@ -344,10 +344,10 @@ class SurveyUtil
             .get_lang('User').'</option>';
 
         foreach ($people_filled as $key => &$person) {
-            if ($survey_data['anonymous'] == 0) {
+            if (0 == $survey_data['anonymous']) {
                 $name = $person['user_info']['complete_name_with_username'];
                 $id = $person['user_id'];
-                if ($id == '') {
+                if ('' == $id) {
                     $id = $person['invited_user'];
                     $name = $person['invited_user'];
                 }
@@ -416,7 +416,7 @@ class SurveyUtil
 					ORDER BY survey_question.sort, survey_question_option.sort ASC";
             $result = Database::query($sql);
             while ($row = Database::fetch_array($result, 'ASSOC')) {
-                if ($row['type'] != 'pagebreak') {
+                if ('pagebreak' != $row['type']) {
                     $questions[$row['sort']]['question_id'] = $row['question_id'];
                     $questions[$row['sort']]['survey_id'] = $row['survey_id'];
                     $questions[$row['sort']]['survey_question'] = $row['survey_question'];
@@ -597,7 +597,7 @@ class SurveyUtil
             $limitStatement = null;
             if (!$singlePage) {
                 echo '<div id="question_report_questionnumbers" class="pagination">';
-                if ($currentQuestion != 0) {
+                if (0 != $currentQuestion) {
                     echo '<li><a href="'.api_get_path(WEB_CODE_PATH).'survey/reporting.php?action='.$action.'&'
                         .api_get_cidreq().'&survey_id='.$surveyId.'&question='.($offset - 1).'">'
                         .get_lang('Previous question').'</a></li>';
@@ -643,10 +643,10 @@ class SurveyUtil
             echo strip_tags(isset($question['survey_question']) ? $question['survey_question'] : null);
             echo '</div>';
 
-            if ($question['type'] == 'score') {
+            if ('score' == $question['type']) {
                 /** @todo This function should return the options as this is needed further in the code */
                 $options = self::display_question_report_score($survey_data, $question, $offset);
-            } elseif ($question['type'] == 'open' || $question['type'] == 'comment') {
+            } elseif ('open' == $question['type'] || 'comment' == $question['type']) {
                 /** @todo Also get the user who has answered this */
                 $sql = "SELECT * FROM $table_survey_answer
                         WHERE
@@ -714,13 +714,13 @@ class SurveyUtil
                         if (isset($data[$value['question_option_id']])) {
                             $absolute_number = $data[$value['question_option_id']]['total'];
                         }
-                        if ($question['type'] == 'percentage' && empty($absolute_number)) {
+                        if ('percentage' == $question['type'] && empty($absolute_number)) {
                             continue;
                         }
                         $number_of_answers[$option['question_id']] = isset($number_of_answers[$option['question_id']])
                             ? $number_of_answers[$option['question_id']]
                             : 0;
-                        if ($number_of_answers[$option['question_id']] == 0) {
+                        if (0 == $number_of_answers[$option['question_id']]) {
                             $answers_number = 0;
                         } else {
                             $answers_number = $absolute_number / $number_of_answers[$option['question_id']] * 100;
@@ -728,7 +728,7 @@ class SurveyUtil
                         echo '	<tr>';
                         echo '		<td class="center">'.$value['option_text'].'</td>';
                         echo '		<td class="center">';
-                        if ($absolute_number != 0) {
+                        if (0 != $absolute_number) {
                             echo '<a href="'.api_get_path(WEB_CODE_PATH).'survey/reporting.php?action='.$action
                                 .'&survey_id='.$surveyId.'&question='.$offset.'&viewoption='
                                 .$value['question_option_id'].'">'.$absolute_number.'</a>';
@@ -753,7 +753,7 @@ class SurveyUtil
 
                 $optionResult = '';
                 if (isset($option['question_id']) && isset($number_of_answers[$option['question_id']])) {
-                    if ($number_of_answers[$option['question_id']] == 0) {
+                    if (0 == $number_of_answers[$option['question_id']]) {
                         $optionResult = '0';
                     } else {
                         $optionResult = $number_of_answers[$option['question_id']];
@@ -1049,9 +1049,9 @@ class SurveyUtil
                 in_array($row['question_id'], $_POST['questions_filter']))
             ) {
                 // We do not show comment and pagebreak question types
-                if ($row['type'] != 'pagebreak') {
+                if ('pagebreak' != $row['type']) {
                     $content .= ' <th';
-                    if ($row['number_of_options'] > 0 && $row['type'] != 'percentage') {
+                    if ($row['number_of_options'] > 0 && 'percentage' != $row['type']) {
                         $content .= ' colspan="'.$row['number_of_options'].'"';
                     }
                     $content .= '>';
@@ -1118,17 +1118,17 @@ class SurveyUtil
                 (is_array($_POST['questions_filter']) && in_array($row['question_id'], $_POST['questions_filter']))
             ) {
                 // we do not show comment and pagebreak question types
-                if ($row['type'] == 'open' || $row['type'] == 'comment') {
+                if ('open' == $row['type'] || 'comment' == $row['type']) {
                     $content .= '<th>&nbsp;-&nbsp;</th>';
                     $possible_answers[$row['question_id']][$row['question_option_id']] = $row['question_option_id'];
                     $display_percentage_header = 1;
-                } elseif ($row['type'] == 'percentage' && $display_percentage_header) {
+                } elseif ('percentage' == $row['type'] && $display_percentage_header) {
                     $content .= '<th>&nbsp;%&nbsp;</th>';
                     $possible_answers[$row['question_id']][$row['question_option_id']] = $row['question_option_id'];
                     $display_percentage_header = 0;
-                } elseif ($row['type'] == 'percentage') {
+                } elseif ('percentage' == $row['type']) {
                     $possible_answers[$row['question_id']][$row['question_option_id']] = $row['question_option_id'];
-                } elseif ($row['type'] != 'pagebreak' && $row['type'] != 'percentage') {
+                } elseif ('pagebreak' != $row['type'] && 'percentage' != $row['type']) {
                     $content .= '<th>';
                     $content .= $row['option_text'];
                     $content .= '</th>';
@@ -1158,9 +1158,9 @@ class SurveyUtil
         $result = Database::query($sql);
         $i = 1;
         while ($row = Database::fetch_array($result)) {
-            if ($old_user != $row['user'] && $old_user != '') {
+            if ($old_user != $row['user'] && '' != $old_user) {
                 $userParam = $old_user;
-                if ($survey_data['anonymous'] != 0) {
+                if (0 != $survey_data['anonymous']) {
                     $userParam = $i;
                     $i++;
                 }
@@ -1175,8 +1175,8 @@ class SurveyUtil
                 $answers_of_user = [];
             }
             if (isset($questions[$row['question_id']]) &&
-                $questions[$row['question_id']]['type'] != 'open' &&
-                $questions[$row['question_id']]['type'] != 'comment'
+                'open' != $questions[$row['question_id']]['type'] &&
+                'comment' != $questions[$row['question_id']]['type']
             ) {
                 $answers_of_user[$row['question_id']][$row['option_id']] = $row;
             } else {
@@ -1186,7 +1186,7 @@ class SurveyUtil
         }
 
         $userParam = $old_user;
-        if ($survey_data['anonymous'] != 0) {
+        if (0 != $survey_data['anonymous']) {
             $userParam = $i;
             $i++;
         }
@@ -1236,8 +1236,8 @@ class SurveyUtil
 
         $content = '<tr>';
         $url = api_get_path(WEB_CODE_PATH).'survey/reporting.php?survey_id='.$surveyId.'&'.api_get_cidreq();
-        if ($survey_data['anonymous'] == 0) {
-            if (intval($user) !== 0) {
+        if (0 == $survey_data['anonymous']) {
+            if (0 !== intval($user)) {
                 $userInfo = api_get_user_info($user);
                 $user_displayed = '-';
                 if (!empty($userInfo)) {
@@ -1271,7 +1271,7 @@ class SurveyUtil
 
         if (is_array($possible_options)) {
             foreach ($possible_options as $question_id => &$possible_option) {
-                if ($questions[$question_id]['type'] == 'open' || $questions[$question_id]['type'] == 'comment') {
+                if ('open' == $questions[$question_id]['type'] || 'comment' == $questions[$question_id]['type']) {
                     $content .= '<td align="center">';
                     if (isset($answers_of_user[$question_id]) && isset($answers_of_user[$question_id]['0'])) {
                         $content .= $answers_of_user[$question_id]['0']['option_id'];
@@ -1279,7 +1279,7 @@ class SurveyUtil
                     $content .= '</td>';
                 } else {
                     foreach ($possible_option as $option_id => &$value) {
-                        if ($questions[$question_id]['type'] == 'percentage') {
+                        if ('percentage' == $questions[$question_id]['type']) {
                             if (!empty($answers_of_user[$question_id][$option_id])) {
                                 $content .= "<td align='center'>";
                                 $content .= $answers_of_user[$question_id][$option_id]['value'];
@@ -1288,7 +1288,7 @@ class SurveyUtil
                         } else {
                             $content .= '<td align="center">';
                             if (!empty($answers_of_user[$question_id][$option_id])) {
-                                if ($answers_of_user[$question_id][$option_id]['value'] != 0) {
+                                if (0 != $answers_of_user[$question_id][$option_id]['value']) {
                                     $content .= $answers_of_user[$question_id][$option_id]['value'];
                                 } else {
                                     $content .= 'v';
@@ -1375,7 +1375,7 @@ class SurveyUtil
                     is_array($_POST['questions_filter']) &&
                     in_array($row['question_id'], $_POST['questions_filter']))
             ) {
-                if ($row['number_of_options'] == 0) {
+                if (0 == $row['number_of_options']) {
                     $return .= str_replace(
                         "\r\n",
                         '  ',
@@ -1461,7 +1461,7 @@ class SurveyUtil
 		          c_id = $course_id AND
 		          survey_id='".$surveyId."'
 		          ";
-        if ($user_id != 0) {
+        if (0 != $user_id) {
             $sql .= "AND user='".Database::escape_string($user_id)."' ";
         }
         $sql .= ' ORDER BY user ASC ';
@@ -1473,7 +1473,7 @@ class SurveyUtil
             if (!in_array($row['question_id'], $questionIdList)) {
                 continue;
             }
-            if ($old_user != $row['user'] && $old_user != '') {
+            if ($old_user != $row['user'] && '' != $old_user) {
                 $return .= self::export_complete_report_row(
                     $survey_data,
                     $possible_answers,
@@ -1484,8 +1484,8 @@ class SurveyUtil
                 $answers_of_user = [];
             }
 
-            if ($possible_answers_type[$row['question_id']] == 'open' ||
-                $possible_answers_type[$row['question_id']] == 'comment'
+            if ('open' == $possible_answers_type[$row['question_id']] ||
+                'comment' == $possible_answers_type[$row['question_id']]
             ) {
                 $temp_id = 'open'.$open_question_iterator;
                 $answers_of_user[$row['question_id']][$temp_id] = $row;
@@ -1530,8 +1530,8 @@ class SurveyUtil
         $display_extra_user_fields = false
     ) {
         $return = '';
-        if ($survey_data['anonymous'] == 0) {
-            if (intval($user) !== 0) {
+        if (0 == $survey_data['anonymous']) {
+            if (0 !== intval($user)) {
                 $userInfo = api_get_user_info($user);
                 if (!empty($userInfo)) {
                     $user_displayed = $userInfo['complete_name_with_username'];
@@ -1564,9 +1564,9 @@ class SurveyUtil
             foreach ($possible_options as $question_id => $possible_option) {
                 if (is_array($possible_option) && count($possible_option) > 0) {
                     foreach ($possible_option as $option_id => &$value) {
-                        $my_answer_of_user = !isset($answers_of_user[$question_id]) || isset($answers_of_user[$question_id]) && $answers_of_user[$question_id] == null ? [] : $answers_of_user[$question_id];
+                        $my_answer_of_user = !isset($answers_of_user[$question_id]) || isset($answers_of_user[$question_id]) && null == $answers_of_user[$question_id] ? [] : $answers_of_user[$question_id];
                         $key = array_keys($my_answer_of_user);
-                        if (isset($key[0]) && substr($key[0], 0, 4) == 'open') {
+                        if (isset($key[0]) && 'open' == substr($key[0], 0, 4)) {
                             $return .= '"'.
                                 str_replace(
                                     '"',
@@ -1581,7 +1581,7 @@ class SurveyUtil
                                 '"';
                         } elseif (!empty($answers_of_user[$question_id][$option_id])) {
                             //$return .= 'v';
-                            if ($answers_of_user[$question_id][$option_id]['value'] != 0) {
+                            if (0 != $answers_of_user[$question_id][$option_id]['value']) {
                                 $return .= $answers_of_user[$question_id][$option_id]['value'];
                             } else {
                                 $return .= 'v';
@@ -1672,8 +1672,8 @@ class SurveyUtil
                 in_array($row['question_id'], $_POST['questions_filter']))
             ) {
                 // We do not show comment and pagebreak question types
-                if ($row['type'] != 'pagebreak') {
-                    if ($row['number_of_options'] == 0 && ($row['type'] == 'open' || $row['type'] == 'comment')) {
+                if ('pagebreak' != $row['type']) {
+                    if (0 == $row['number_of_options'] && ('open' == $row['type'] || 'comment' == $row['type'])) {
                         $list[$line][$column] = api_html_entity_decode(
                             strip_tags($row['survey_question']),
                             ENT_QUOTES
@@ -1737,7 +1737,7 @@ class SurveyUtil
                 in_array($row['question_id'], $_POST['questions_filter']))
             ) {
                 // We do not show comment and pagebreak question types
-                if ($row['type'] != 'pagebreak') {
+                if ('pagebreak' != $row['type']) {
                     $list[$line][$column] = api_html_entity_decode(
                         strip_tags($row['option_text']),
                         ENT_QUOTES
@@ -1756,7 +1756,7 @@ class SurveyUtil
         $answers_of_user = [];
         $sql = "SELECT * FROM $table_survey_answer
                 WHERE c_id = $course_id AND survey_id = $surveyId";
-        if ($user_id != 0) {
+        if (0 != $user_id) {
             $sql .= " AND user='".$user_id."' ";
         }
         $sql .= ' ORDER BY user ASC';
@@ -1764,7 +1764,7 @@ class SurveyUtil
         $open_question_iterator = 1;
         $result = Database::query($sql);
         while ($row = Database::fetch_array($result)) {
-            if ($old_user != $row['user'] && $old_user != '') {
+            if ($old_user != $row['user'] && '' != $old_user) {
                 $return = self::export_complete_report_row_xls(
                     $survey_data,
                     $possible_answers,
@@ -1780,7 +1780,7 @@ class SurveyUtil
                 $line++;
                 $column = 0;
             }
-            if ($possible_answers_type[$row['question_id']] == 'open' || $possible_answers_type[$row['question_id']] == 'comment') {
+            if ('open' == $possible_answers_type[$row['question_id']] || 'comment' == $possible_answers_type[$row['question_id']]) {
                 $temp_id = 'open'.$open_question_iterator;
                 $answers_of_user[$row['question_id']][$temp_id] = $row;
                 $open_question_iterator++;
@@ -1827,8 +1827,8 @@ class SurveyUtil
         $display_extra_user_fields = false
     ) {
         $return = [];
-        if ($survey_data['anonymous'] == 0) {
-            if (intval($user) !== 0) {
+        if (0 == $survey_data['anonymous']) {
+            if (0 !== intval($user)) {
                 $userInfo = api_get_user_info($user);
                 if ($userInfo) {
                     $user_displayed = $userInfo['complete_name_with_username'];
@@ -1865,13 +1865,13 @@ class SurveyUtil
                             ? $answers_of_user[$question_id]
                             : [];
                         $key = array_keys($my_answers_of_user);
-                        if (isset($key[0]) && substr($key[0], 0, 4) == 'open') {
+                        if (isset($key[0]) && 'open' == substr($key[0], 0, 4)) {
                             $return[] = api_html_entity_decode(
                                 strip_tags($answers_of_user[$question_id][$key[0]]['option_id']),
                                 ENT_QUOTES
                             );
                         } elseif (!empty($answers_of_user[$question_id][$option_id])) {
-                            if ($answers_of_user[$question_id][$option_id]['value'] != 0) {
+                            if (0 != $answers_of_user[$question_id][$option_id]['value']) {
                                 $return[] = $answers_of_user[$question_id][$option_id]['value'];
                             } else {
                                 $return[] = 'v';
@@ -1949,7 +1949,7 @@ class SurveyUtil
         foreach ($questions as $key => &$question) {
             // Ignored tagged questions
             if ($question) {
-                if (strpos($question['question'], '{{') !== false) {
+                if (false !== strpos($question['question'], '{{')) {
                     $question = null;
                     continue;
                 }
@@ -1998,10 +1998,10 @@ class SurveyUtil
             // The header
             $tableHtml .= '<tr>';
             for ($ii = 0; $ii <= count($question_x['answers']); $ii++) {
-                if ($ii == 0) {
+                if (0 == $ii) {
                     $tableHtml .= '<th>&nbsp;</th>';
                 } else {
-                    if ($question_x['type'] == 'score') {
+                    if ('score' == $question_x['type']) {
                         for ($x = 1; $x <= $question_x['maximum_score']; $x++) {
                             $tableHtml .= '<th>'.$question_x['answers'][($ii - 1)].'<br />'.$x.'</th>';
                         }
@@ -2021,13 +2021,13 @@ class SurveyUtil
                 $currentYQuestion = strip_tags($question_y['answers'][$ij]);
                 $currentYQuestion = html_entity_decode($currentYQuestion);
                 // The Y axis is a scoring question type so we have more rows than the options (actually options * maximum score)
-                if ($question_y['type'] == 'score') {
+                if ('score' == $question_y['type']) {
                     for ($y = 1; $y <= $question_y['maximum_score']; $y++) {
                         $tableHtml .= '<tr>';
                         for ($ii = 0; $ii <= count($question_x['answers']); $ii++) {
-                            if ($question_x['type'] == 'score') {
+                            if ('score' == $question_x['type']) {
                                 for ($x = 1; $x <= $question_x['maximum_score']; $x++) {
-                                    if ($ii == 0) {
+                                    if (0 == $ii) {
                                         $tableHtml .= '<th>'.$question_y['answers'][($ij)].' '.$y.'</th>';
                                         break;
                                     } else {
@@ -2053,7 +2053,7 @@ class SurveyUtil
                                     }
                                 }
                             } else {
-                                if ($ii == 0) {
+                                if (0 == $ii) {
                                     $tableHtml .= '<th>'.$question_y['answers'][$ij].' '.$y.'</th>';
                                 } else {
                                     $tableHtml .= '<td align="center">';
@@ -2084,9 +2084,9 @@ class SurveyUtil
                     // The Y axis is NOT a score question type so the number of rows = the number of options
                     $tableHtml .= '<tr>';
                     for ($ii = 0; $ii <= count($question_x['answers']); $ii++) {
-                        if ($question_x['type'] == 'score') {
+                        if ('score' == $question_x['type']) {
                             for ($x = 1; $x <= $question_x['maximum_score']; $x++) {
-                                if ($ii == 0) {
+                                if (0 == $ii) {
                                     $tableHtml .= '<th>'.$question_y['answers'][$ij].'</th>';
                                     break;
                                 } else {
@@ -2112,7 +2112,7 @@ class SurveyUtil
                                 }
                             }
                         } else {
-                            if ($ii == 0) {
+                            if (0 == $ii) {
                                 $tableHtml .= '<th>'.$question_y['answers'][($ij)].'</th>';
                             } else {
                                 $tableHtml .= '<td align="center">';
@@ -2172,7 +2172,7 @@ class SurveyUtil
         $result = Database::query($sql);
         $return = [];
         while ($row = Database::fetch_array($result)) {
-            if ($row['value'] == 0) {
+            if (0 == $row['value']) {
                 $return[$row['user']][] = $row['option_id'];
             } else {
                 $return[$row['user']][] = $row['option_id'].'*'.$row['value'];
@@ -2204,12 +2204,12 @@ class SurveyUtil
         $value_x = 0,
         $value_y = 0
     ) {
-        if ($value_x == 0) {
+        if (0 == $value_x) {
             $check_x = $option_x;
         } else {
             $check_x = $option_x.'*'.$value_x;
         }
-        if ($value_y == 0) {
+        if (0 == $value_y) {
             $check_y = $option_y;
         } else {
             $check_y = $option_y.'*'.$value_y;
@@ -2250,7 +2250,7 @@ class SurveyUtil
         $table_survey = Database::get_course_table(TABLE_SURVEY);
 
         // Reminder or not
-        if ($reminder == 0) {
+        if (0 == $reminder) {
             $mail_field = 'invite_mail';
         } else {
             $mail_field = 'reminder_mail';
@@ -2306,7 +2306,7 @@ class SurveyUtil
 
         // Remind unanswered is a special version of remind all reminder
         $exclude_users = [];
-        if ($remindUnAnswered == 1) {
+        if (1 == $remindUnAnswered) {
             // Remind only unanswered users
             $reminder = 1;
             $exclude_users = SurveyManager::get_people_who_filled_survey($_GET['survey_id']);
@@ -2316,7 +2316,7 @@ class SurveyUtil
         $course_id = api_get_course_int_id();
         $session_id = api_get_session_id();
 
-        if ($isAdditionalEmail == false) {
+        if (false == $isAdditionalEmail) {
             $result = CourseManager::separateUsersGroups($users_array);
             $groupList = $result['groups'];
             $users_array = $result['users'];
@@ -2347,7 +2347,7 @@ class SurveyUtil
 
         $users_array = array_unique($users_array);
         foreach ($users_array as $key => $value) {
-            if (!isset($value) || $value == '') {
+            if (!isset($value) || '' == $value) {
                 continue;
             }
 
@@ -2357,7 +2357,7 @@ class SurveyUtil
             }
 
             // Get the unique invitation code if we already have it
-            if ($reminder == 1 && array_key_exists($value, $survey_invitations)) {
+            if (1 == $reminder && array_key_exists($value, $survey_invitations)) {
                 $invitation_code = $survey_invitations[$value]['invitation_code'];
             } else {
                 $invitation_code = md5($value.microtime());
@@ -2367,7 +2367,7 @@ class SurveyUtil
             $addit_users_array = isset($already_invited['additional_users']) && !empty($already_invited['additional_users'])
                     ? explode(';', $already_invited['additional_users'])
                     : [];
-            $my_alredy_invited = $already_invited['course_users'] == null ? [] : $already_invited['course_users'];
+            $my_alredy_invited = null == $already_invited['course_users'] ? [] : $already_invited['course_users'];
             if ((is_numeric($value) && !in_array($value, $my_alredy_invited)) ||
                 (!is_numeric($value) && !in_array($value, $addit_users_array))
             ) {
@@ -2386,7 +2386,7 @@ class SurveyUtil
             }
 
             // Send the email if checkboxed
-            if (($new_user || $reminder == 1) && $sendmail) {
+            if (($new_user || 1 == $reminder) && $sendmail) {
                 // Make a change for absolute url
                 if (isset($invitation_text)) {
                     $invitation_text = api_html_entity_decode($invitation_text, ENT_QUOTES);
@@ -2509,7 +2509,7 @@ class SurveyUtil
         $sender_user_id = api_get_user_id();
 
         $replyto = [];
-        if (api_get_setting('survey_email_sender_noreply') == 'noreply') {
+        if ('noreply' == api_get_setting('survey_email_sender_noreply')) {
             $noreply = api_get_setting('noreply_email_address');
             if (!empty($noreply)) {
                 $replyto['Reply-to'] = $noreply;
@@ -2958,7 +2958,7 @@ class SurveyUtil
         ) {
             $editUrl = $codePath.'survey/create_new_survey.php?'.
                 http_build_query($params + ['action' => 'edit', 'survey_id' => $survey_id]);
-            if ($survey->getSurveyType() == 3) {
+            if (3 == $survey->getSurveyType()) {
                 $editUrl = $codePath.'survey/edit_meeting.php?'.
                     http_build_query($params + ['action' => 'edit', 'survey_id' => $survey_id]);
             }
@@ -2975,7 +2975,7 @@ class SurveyUtil
                 );
             }
 
-            if ($type != 3) {
+            if (3 != $type) {
                 $actions[] = Display::url(
                     Display::return_icon('backup.png', get_lang('Copy survey')),
                     $codePath.'survey/copy_survey.php?'.http_build_query($params + ['survey_id' => $survey_id])
@@ -3011,7 +3011,7 @@ class SurveyUtil
             }
         }
 
-        if ($type != 3) {
+        if (3 != $type) {
             $actions[] = Display::url(
                 Display::return_icon('preview_view.png', get_lang('Preview')),
                 $codePath.'survey/preview.php?'.http_build_query($params + ['survey_id' => $survey_id])
@@ -3023,7 +3023,7 @@ class SurveyUtil
             $codePath.'survey/survey_invite.php?'.http_build_query($params + ['survey_id' => $survey_id])
         );
 
-        if ($type != 3) {
+        if (3 != $type) {
             $actions[] = $hideReportingButton ? null : $reportingLink;
         }
 
@@ -3115,7 +3115,7 @@ class SurveyUtil
      */
     public static function anonymous_filter($anonymous)
     {
-        if ($anonymous == 1) {
+        if (1 == $anonymous) {
             return get_lang('Yes');
         } else {
             return get_lang('No');
@@ -3134,16 +3134,16 @@ class SurveyUtil
     public static function survey_search_restriction()
     {
         if (isset($_GET['do_search'])) {
-            if ($_GET['keyword_title'] != '') {
+            if ('' != $_GET['keyword_title']) {
                 $search_term[] = 'title like "%" \''.Database::escape_string($_GET['keyword_title']).'\' "%"';
             }
-            if ($_GET['keyword_code'] != '') {
+            if ('' != $_GET['keyword_code']) {
                 $search_term[] = 'code =\''.Database::escape_string($_GET['keyword_code']).'\'';
             }
-            if ($_GET['keyword_language'] != '%') {
+            if ('%' != $_GET['keyword_language']) {
                 $search_term[] = 'lang =\''.Database::escape_string($_GET['keyword_language']).'\'';
             }
-            $my_search_term = ($search_term == null) ? [] : $search_term;
+            $my_search_term = (null == $search_term) ? [] : $search_term;
             $search_restriction = implode(' AND ', $my_search_term);
 
             return $search_restriction;
@@ -3278,7 +3278,7 @@ class SurveyUtil
                 $array[1] = $survey[1];
             } else {
                 // Doodle
-                if ($survey['survey_type'] == 3) {
+                if (3 == $survey['survey_type']) {
                     $array[1] = Display::url(
                         $survey[1],
                         api_get_path(WEB_CODE_PATH).'survey/meeting.php?survey_id='.$survey[0].'&'.api_get_cidreq()
@@ -3300,7 +3300,7 @@ class SurveyUtil
             // Dates
             $array[5] = '';
 
-            if (!empty($survey[5]) && $survey[5] !== '0000-00-00' && $survey[5] !== '0000-00-00 00:00:00') {
+            if (!empty($survey[5]) && '0000-00-00' !== $survey[5] && '0000-00-00 00:00:00' !== $survey[5]) {
                 $array[5] = api_convert_and_format_date(
                     $survey[5],
                     $allowSurveyAvailabilityDatetime ? DATE_TIME_FORMAT_LONG : DATE_FORMAT_LONG
@@ -3308,7 +3308,7 @@ class SurveyUtil
             }
 
             $array[6] = '';
-            if (!empty($survey[6]) && $survey[6] !== '0000-00-00' && $survey[6] !== '0000-00-00 00:00:00') {
+            if (!empty($survey[6]) && '0000-00-00' !== $survey[6] && '0000-00-00 00:00:00' !== $survey[6]) {
                 $array[6] = api_convert_and_format_date(
                     $survey[6],
                     $allowSurveyAvailabilityDatetime ? DATE_TIME_FORMAT_LONG : DATE_FORMAT_LONG
@@ -3515,7 +3515,7 @@ class SurveyUtil
             }
 
             echo '<tr>';
-            if ($row['answered'] == 0) {
+            if (0 == $row['answered']) {
                 echo '<td>';
                 echo Display::return_icon(
                     'statistics.png',
@@ -3539,7 +3539,7 @@ class SurveyUtil
                     ICON_SIZE_TINY
                 );
                 $showLink = (!api_is_allowed_to_edit(false, true) || $isDrhOfCourse)
-                    && $row['visible_results'] != SURVEY_VISIBLE_TUTOR;
+                    && SURVEY_VISIBLE_TUTOR != $row['visible_results'];
 
                 echo '<td>';
                 echo $showLink
@@ -3554,7 +3554,7 @@ class SurveyUtil
                 echo '</td>';
             }
             echo '<td class="text-center">';
-            echo ($row['anonymous'] == 1) ? get_lang('Yes') : get_lang('No');
+            echo (1 == $row['anonymous']) ? get_lang('Yes') : get_lang('No');
             echo '</td>';
             if ($mandatoryAllowed) {
                 $efvMandatory = $efv->get_values_by_handler_and_field_variable(
@@ -3587,7 +3587,7 @@ class SurveyUtil
         $field_list_array['lastname']['name'] = get_lang('Last name');
         $field_list_array['firstname']['name'] = get_lang('First name');
 
-        if (api_get_setting('profile', 'name') != 'true') {
+        if ('true' != api_get_setting('profile', 'name')) {
             $field_list_array['firstname']['visibility'] = 0;
             $field_list_array['lastname']['visibility'] = 0;
         } else {
@@ -3601,7 +3601,7 @@ class SurveyUtil
         //	OFFICIAL CODE
         $field_list_array['official_code']['name'] = get_lang('OfficialCourse code');
 
-        if (api_get_setting('profile', 'officialcode') != 'true') {
+        if ('true' != api_get_setting('profile', 'officialcode')) {
             $field_list_array['official_code']['visibility'] = 1;
         } else {
             $field_list_array['official_code']['visibility'] = 0;
@@ -3609,7 +3609,7 @@ class SurveyUtil
 
         // EMAIL
         $field_list_array['email']['name'] = get_lang('e-mail');
-        if (api_get_setting('profile', 'email') != 'true') {
+        if ('true' != api_get_setting('profile', 'email')) {
             $field_list_array['email']['visibility'] = 1;
         } else {
             $field_list_array['email']['visibility'] = 0;
@@ -3617,14 +3617,14 @@ class SurveyUtil
 
         // PHONE
         $field_list_array['phone']['name'] = get_lang('Phone');
-        if (api_get_setting('profile', 'phone') != 'true') {
+        if ('true' != api_get_setting('profile', 'phone')) {
             $field_list_array['phone']['visibility'] = 0;
         } else {
             $field_list_array['phone']['visibility'] = 1;
         }
         //	LANGUAGE
         $field_list_array['language']['name'] = get_lang('Language');
-        if (api_get_setting('profile', 'language') != 'true') {
+        if ('true' != api_get_setting('profile', 'language')) {
             $field_list_array['language']['visibility'] = 0;
         } else {
             $field_list_array['language']['visibility'] = 1;
@@ -3634,13 +3634,13 @@ class SurveyUtil
         $extra = UserManager::get_extra_fields(0, 50, 5, 'ASC');
 
         foreach ($extra as $id => $field_details) {
-            if ($field_details[6] == 0) {
+            if (0 == $field_details[6]) {
                 continue;
             }
             switch ($field_details[2]) {
                 case UserManager::USER_FIELD_TYPE_TEXT:
                     $field_list_array['extra_'.$field_details[1]]['name'] = $field_details[3];
-                    if ($field_details[7] == 0) {
+                    if (0 == $field_details[7]) {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 0;
                     } else {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 1;
@@ -3648,7 +3648,7 @@ class SurveyUtil
                     break;
                 case UserManager::USER_FIELD_TYPE_TEXTAREA:
                     $field_list_array['extra_'.$field_details[1]]['name'] = $field_details[3];
-                    if ($field_details[7] == 0) {
+                    if (0 == $field_details[7]) {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 0;
                     } else {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 1;
@@ -3656,7 +3656,7 @@ class SurveyUtil
                     break;
                 case UserManager::USER_FIELD_TYPE_RADIO:
                     $field_list_array['extra_'.$field_details[1]]['name'] = $field_details[3];
-                    if ($field_details[7] == 0) {
+                    if (0 == $field_details[7]) {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 0;
                     } else {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 1;
@@ -3678,7 +3678,7 @@ class SurveyUtil
                         $field_list_array['extra_'.$field_details[1]]['name'] = $field_details[3];
                     }
 
-                    if ($field_details[7] == 0) {
+                    if (0 == $field_details[7]) {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 0;
                     } else {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 1;
@@ -3686,7 +3686,7 @@ class SurveyUtil
                     break;
                 case UserManager::USER_FIELD_TYPE_SELECT_MULTIPLE:
                     $field_list_array['extra_'.$field_details[1]]['name'] = $field_details[3];
-                    if ($field_details[7] == 0) {
+                    if (0 == $field_details[7]) {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 0;
                     } else {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 1;
@@ -3694,7 +3694,7 @@ class SurveyUtil
                     break;
                 case UserManager::USER_FIELD_TYPE_DATE:
                     $field_list_array['extra_'.$field_details[1]]['name'] = $field_details[3];
-                    if ($field_details[7] == 0) {
+                    if (0 == $field_details[7]) {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 0;
                     } else {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 1;
@@ -3702,7 +3702,7 @@ class SurveyUtil
                     break;
                 case UserManager::USER_FIELD_TYPE_DATETIME:
                     $field_list_array['extra_'.$field_details[1]]['name'] = $field_details[3];
-                    if ($field_details[7] == 0) {
+                    if (0 == $field_details[7]) {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 0;
                     } else {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 1;
@@ -3710,7 +3710,7 @@ class SurveyUtil
                     break;
                 case UserManager::USER_FIELD_TYPE_DOUBLE_SELECT:
                     $field_list_array['extra_'.$field_details[1]]['name'] = $field_details[3];
-                    if ($field_details[7] == 0) {
+                    if (0 == $field_details[7]) {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 0;
                     } else {
                         $field_list_array['extra_'.$field_details[1]]['visibility'] = 1;
diff --git a/public/main/survey/survey_invitation.php b/public/main/survey/survey_invitation.php
index 72faac475f..76040df6ef 100644
--- a/public/main/survey/survey_invitation.php
+++ b/public/main/survey/survey_invitation.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.survey
- *
  * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University: cleanup, refactoring and rewriting large parts of the code
  *
  * @version $Id: survey_invite.php 10680 2007-01-11 21:26:23Z pcool $
@@ -61,13 +59,13 @@ $invitationsCount = count($sentInvitations);
 $answeredCount = count($answered_data);
 $unasnweredCount = count($sentInvitations) - count($answered_data);
 
-if ($survey_data['anonymous'] == 1 && !api_get_configuration_value('survey_anonymous_show_answered')) {
+if (1 == $survey_data['anonymous'] && !api_get_configuration_value('survey_anonymous_show_answered')) {
     echo Display::return_message(
         get_lang('This survey is anonymous. You can\'t see who answered.').' '.$answeredCount.' '.get_lang('people answered')
     );
     $answered_data = [];
 }
-if ($survey_data['anonymous'] == 1) {
+if (1 == $survey_data['anonymous']) {
     if ($answeredCount < 2) {
         $answeredCount = 0;
         $unasnweredCount = $invitationsCount;
@@ -77,7 +75,7 @@ $url = api_get_self().'?survey_id='.$survey_id.'&'.api_get_cidreq();
 
 echo '<ul class="nav nav-tabs">';
 
-if ($view == 'invited') {
+if ('invited' == $view) {
     echo '<li role="presentation" class="active"><a href="#">'.get_lang('View invited');
 } else {
     echo '<li role="presentation"><a href="'.$url.'&view=invited">'.
@@ -85,7 +83,7 @@ if ($view == 'invited') {
 }
 echo ' <span class="badge badge-default">'.$invitationsCount.'</span>';
 echo '</a></li>';
-if ($view == 'answered') {
+if ('answered' == $view) {
     echo '<li role="presentation" class="active"><a href="#">'.get_lang('View people who answered');
 } else {
     echo '<li role="presentation"><a href="'.$url.'&view=answered">'.
@@ -94,7 +92,7 @@ if ($view == 'answered') {
 echo ' <span class="badge badge-default">'.$answeredCount.'</span>';
 echo '</a></li>';
 
-if ($view == 'unanswered') {
+if ('unanswered' == $view) {
     echo '<li role="presentation" class="active"><a href="#">'.get_lang('View people who didn\'t answer');
 } else {
     echo '<li role="presentation"><a href="'.$url.'&view=unanswered">'.
@@ -126,9 +124,9 @@ $hideSurveyReportingButton = api_get_configuration_value('hide_survey_reporting_
 
 foreach ($sentInvitations as $row) {
     $id = $row['iid'];
-    if ($view == 'invited' ||
-        ($view == 'answered' && in_array($row['user'], $answered_data) && $answeredCount > 1) ||
-        ($view == 'unanswered' && !in_array($row['user'], $answered_data) && $answeredCount > 1)
+    if ('invited' == $view ||
+        ('answered' == $view && in_array($row['user'], $answered_data) && $answeredCount > 1) ||
+        ('unanswered' == $view && !in_array($row['user'], $answered_data) && $answeredCount > 1)
     ) {
         echo '<tr>';
         if (is_numeric($row['user'])) {
@@ -150,14 +148,14 @@ foreach ($sentInvitations as $row) {
                     get_lang('View answers').'</a>';
                 echo '</td>';
             } else {
-                if ($survey_data['anonymous'] == 1 && $answeredCount > 1) {
+                if (1 == $survey_data['anonymous'] && $answeredCount > 1) {
                     echo '<td>'.get_lang('Answered').'</td>';
                 } else {
                     echo '<td>-</td>';
                 }
             }
         } else {
-            if ($view == 'unanswered') {
+            if ('unanswered' == $view) {
                 echo '	<td>';
                 $code = $row['invitation_code'];
 
@@ -177,7 +175,7 @@ foreach ($sentInvitations as $row) {
         }
 
         echo '</tr>';
-    } elseif ($view === 'unanswered' && $answeredCount == 0) {
+    } elseif ('unanswered' === $view && 0 == $answeredCount) {
         echo '<tr>';
         if (is_numeric($row['user'])) {
             $userInfo = api_get_user_info($row['user']);
diff --git a/public/main/survey/survey_invite.php b/public/main/survey/survey_invite.php
index 887735bba5..88d86cd6c7 100644
--- a/public/main/survey/survey_invite.php
+++ b/public/main/survey/survey_invite.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 
 /**
- * @package chamilo.survey
- *
  * @author unknown, the initial survey that did not make it in 1.8 because of bad code
  * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University: cleanup, refactoring and rewriting large parts of the code
  * @author Julio Montoya Chamilo: cleanup, refactoring, security improvements
@@ -46,7 +44,7 @@ $interbreadcrumb[] = [
     'name' => get_lang('Survey list'),
 ];
 if (api_is_course_admin()) {
-    if ($survey_data['survey_type'] == 3) {
+    if (3 == $survey_data['survey_type']) {
         $interbreadcrumb[] = [
             'url' => api_get_path(WEB_CODE_PATH).'survey/meeting.php?survey_id='.$survey_id.'&'.api_get_cidreq(),
             'name' => $urlname,
@@ -148,7 +146,7 @@ $form->addHtmlEditor(
 );
 $form->addElement('html', '</div>');
 // You cab send a reminder to unanswered people if the survey is not anonymous
-if ($survey_data['anonymous'] != 1 || api_get_configuration_value('survey_anonymous_show_answered')) {
+if (1 != $survey_data['anonymous'] || api_get_configuration_value('survey_anonymous_show_answered')) {
     $form->addElement('checkbox', 'remindUnAnswered', '', get_lang('Remind only users who didn\'t answer'));
 }
 // Allow resending to all selected users
diff --git a/public/main/survey/survey_list.php b/public/main/survey/survey_list.php
index fcab008c3f..63db00a554 100644
--- a/public/main/survey/survey_list.php
+++ b/public/main/survey/survey_list.php
@@ -68,7 +68,7 @@ if (!api_is_allowed_to_edit(false, true)) {
 $extend_rights_for_coachs = api_get_setting('extend_rights_for_coach_on_survey');
 
 // Database table definitions
-if (isset($_GET['search']) && $_GET['search'] == 'advanced') {
+if (isset($_GET['search']) && 'advanced' == $_GET['search']) {
     $interbreadcrumb[] = [
         'url' => api_get_path(WEB_CODE_PATH).'survey/survey_list.php',
         'name' => get_lang('Survey list'),
@@ -137,7 +137,7 @@ switch ($action) {
         break;
     case 'empty':
         $mysession = api_get_session_id();
-        if ($mysession != 0) {
+        if (0 != $mysession) {
             if (!((api_is_session_general_coach() || api_is_platform_admin()) &&
                 api_is_element_in_the_session(TOOL_SURVEY, $surveyId))) {
                 // The coach can't empty a survey not belonging to his session
@@ -164,7 +164,7 @@ Display::display_header($tool_name, 'Survey');
 Display::display_introduction_section('survey', 'left');
 
 // Action handling: searching
-if (isset($_GET['search']) && $_GET['search'] == 'advanced') {
+if (isset($_GET['search']) && 'advanced' == $_GET['search']) {
     SurveyUtil::display_survey_search_form();
 }
 
@@ -188,7 +188,7 @@ if (isset($_POST['action']) && $_POST['action']) {
 }
 
 echo '<div class="actions">';
-if (!api_is_session_general_coach() || $extend_rights_for_coachs == 'true') {
+if (!api_is_session_general_coach() || 'true' == $extend_rights_for_coachs) {
     // Action links
     echo '<a href="'.api_get_path(WEB_CODE_PATH).'survey/create_new_survey.php?'.api_get_cidreq().'&amp;action=add">'.
         Display::return_icon('new_survey.png', get_lang('Create survey'), '', ICON_SIZE_MEDIUM).'</a> ';
@@ -200,7 +200,7 @@ echo '<a href="'.api_get_self().'?'.api_get_cidreq().'&amp;search=advanced">'.
 echo '</div>';
 
 // Load main content
-if (api_is_session_general_coach() && $extend_rights_for_coachs == 'false') {
+if (api_is_session_general_coach() && 'false' == $extend_rights_for_coachs) {
     SurveyUtil::display_survey_list_for_coach();
 } else {
     SurveyUtil::display_survey_list();
diff --git a/public/main/survey/survey_question.php b/public/main/survey/survey_question.php
index 6f3fa6070c..05e0b8e8b6 100644
--- a/public/main/survey/survey_question.php
+++ b/public/main/survey/survey_question.php
@@ -115,9 +115,9 @@ class survey_question
             ['align' => 'middle', 'height' => '22px']
         ).' ';
 
-        if ($action == 'add') {
+        if ('add' == $action) {
             $toolName .= get_lang('Add a question').': ';
-        } elseif ($action == 'edit') {
+        } elseif ('edit' == $action) {
             $toolName .= get_lang('Edit question').': ';
         }
 
@@ -164,7 +164,7 @@ class survey_question
         }
 
         // When survey type = 1??
-        if ($surveyData['survey_type'] == 1) {
+        if (1 == $surveyData['survey_type']) {
             $table_survey_question_group = Database::get_course_table(TABLE_SURVEY_QUESTION_GROUP);
             $sql = 'SELECT id,name FROM '.$table_survey_question_group.'
                     WHERE survey_id = '.(int) $_GET['survey_id'].'
@@ -204,12 +204,12 @@ class survey_question
 			<fieldset style="border:1px solid black"><legend>'.get_lang('Condition').'</legend>
 
 			<b>'.get_lang('Primary').'</b><br />
-			'.'<input type="radio" name="choose" value="1" '.(($formData['choose'] == 1) ? 'checked' : '').
+			'.'<input type="radio" name="choose" value="1" '.((1 == $formData['choose']) ? 'checked' : '').
                 '><select name="assigned">'.$grouplist.'</select><br />';
 
             $this->html .= '
 			<b>'.get_lang('Secondary').'</b><br />
-			'.'<input type="radio" name="choose" value="2" '.(($formData['choose'] == 2) ? 'checked' : '').
+			'.'<input type="radio" name="choose" value="2" '.((2 == $formData['choose']) ? 'checked' : '').
                 '><select name="assigned1">'.$grouplist1.'</select> '.
                 '<select name="assigned2">'.$grouplist2.'</select>'
                 .'</fieldset><br />';
@@ -395,7 +395,7 @@ class survey_question
                 $formData
             );
 
-            if ($message == 'QuestionAdded' || $message == 'QuestionUpdated') {
+            if ('QuestionAdded' == $message || 'QuestionUpdated' == $message) {
                 header('Location: '.api_get_path(WEB_CODE_PATH).'survey/survey.php?survey_id='.intval($_GET['survey_id']).'&message='.$message.'&'.api_get_cidreq());
                 exit;
             }
diff --git a/public/main/ticket/ticket_details.php b/public/main/ticket/ticket_details.php
index 2090eb6d62..2abd1640e6 100644
--- a/public/main/ticket/ticket_details.php
+++ b/public/main/ticket/ticket_details.php
@@ -206,7 +206,7 @@ foreach ($messages as $message) {
             ['class' => 'well']
         );
     }
-    ++$counter;
+    $counter++;
 }
 
 $subject = get_lang('Re:').': '.Security::remove_XSS($ticket['ticket']['subject']);
diff --git a/public/main/ticket/tutor_report.lib.php b/public/main/ticket/tutor_report.lib.php
index d5e3e8512c..dd0a44c35a 100644
--- a/public/main/ticket/tutor_report.lib.php
+++ b/public/main/ticket/tutor_report.lib.php
@@ -36,7 +36,7 @@ function initializeReport($course_code)
                     WHERE  week_id > $weeksCount AND course_code = '$course_code'";
             Database::query($sql);
         } else {
-            for ($i = $obj->cant + 1; $i <= $weeksCount; ++$i) {
+            for ($i = $obj->cant + 1; $i <= $weeksCount; $i++) {
                 if (!Database::query("INSERT INTO $table_reporte_semanas (week_id, course_code, forum_id, work_id, quiz_id, pc_id)
 						VALUES ($i, '$course_code', '0', '0', '0', '0' )")) {
                     return false;
@@ -149,7 +149,7 @@ function showResults($courseInfo, $weeksCount, $page)
     $html .= '<table class="reports">';
     $html .= '<tr>
             <th ></th>';
-    for ($i = 7 * $page - 6; $i <= $page * 7; ++$i) {
+    for ($i = 7 * $page - 6; $i <= $page * 7; $i++) {
         $html .= '<th colspan="2">Week '.$i.'<a href="assign_tickets.php?id='.$ids[$i].'" class="ajax">'.Display::return_icon('edit.png', get_lang('Edit'), ['width' => '16', 'height' => '16'], 22).'</a></th>';
     }
     $html .= '</tr>';
diff --git a/public/main/timeline/index.php b/public/main/timeline/index.php
index fd1226c441..daaffad117 100644
--- a/public/main/timeline/index.php
+++ b/public/main/timeline/index.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  *	@author Julio Montoya <gugli100@gmail.com> BeezNest 2011
- *
- *	@package chamilo.timeline
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -70,7 +68,7 @@ $timeline = new Timeline();
 // Action handling: Add
 switch ($action) {
     case 'add':
-        if (api_get_session_id() != 0 && !api_is_allowed_to_session_edit(false, true)) {
+        if (0 != api_get_session_id() && !api_is_allowed_to_session_edit(false, true)) {
             api_not_allowed();
         }
         $url = api_get_self().'?action='.Security::remove_XSS($_GET['action']);
diff --git a/public/main/timeline/view.php b/public/main/timeline/view.php
index 41cd3d7972..f3692a2269 100644
--- a/public/main/timeline/view.php
+++ b/public/main/timeline/view.php
@@ -2,7 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
     @author Julio Montoya <gugli100@gmail.com> BeezNest 2011
- *	@package chamilo.timeline
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/tracking/courseLog.php b/public/main/tracking/courseLog.php
index d0dd470f40..a79382f652 100644
--- a/public/main/tracking/courseLog.php
+++ b/public/main/tracking/courseLog.php
@@ -4,9 +4,6 @@
 use Chamilo\CoreBundle\Component\Utils\ChamiloApi;
 use ChamiloSession as Session;
 
-/**
- * @package chamilo.tracking
- */
 require_once __DIR__.'/../inc/global.inc.php';
 
 $current_course_tool = TOOL_TRACKING;
@@ -22,13 +19,13 @@ $from = isset($_GET['from']) ? $_GET['from'] : null;
 $origin = api_get_origin();
 
 // Starting the output buffering when we are exporting the information.
-$export_csv = isset($_GET['export']) && $_GET['export'] === 'csv' ? true : false;
+$export_csv = isset($_GET['export']) && 'csv' === $_GET['export'] ? true : false;
 
 $htmlHeadXtra[] = api_get_js('chartjs/Chart.min.js');
 $htmlHeadXtra[] = ' ';
 
 $this_section = SECTION_COURSES;
-if ($from === 'myspace') {
+if ('myspace' === $from) {
     $from_myspace = true;
     $this_section = 'session_my_space';
 }
@@ -137,7 +134,7 @@ $table_user = Database::get_main_table(TABLE_MAIN_USER);
 $TABLEQUIZ = Database::get_course_table(TABLE_QUIZ_TEST);
 
 // Breadcrumbs.
-if ($origin === 'resume_session') {
+if ('resume_session' === $origin) {
     $interbreadcrumb[] = [
         'url' => '../admin/index.php',
         'name' => get_lang('Administration'),
@@ -284,7 +281,7 @@ if (!empty($coaches)) {
     $html .= $coaches;
 }
 
-$showReporting = api_get_configuration_value('hide_reporting_session_list') === false;
+$showReporting = false === api_get_configuration_value('hide_reporting_session_list');
 if ($showReporting) {
     $sessionList = SessionManager::get_session_by_course($courseInfo['real_id']);
     if (!empty($sessionList)) {
@@ -303,7 +300,7 @@ if ($showReporting) {
             if (!$isAdmin) {
                 // Check session visibility
                 $visibility = api_get_session_visibility($session['id'], api_get_course_int_id());
-                if ($visibility == SESSION_INVISIBLE) {
+                if (SESSION_INVISIBLE == $visibility) {
                     continue;
                 }
 
@@ -346,20 +343,20 @@ if ($nbStudents > 0) {
 
     $hideReports = api_get_configuration_value('hide_course_report_graph');
 
-    if ($hideReports === false) {
+    if (false === $hideReports) {
         foreach ($usersTracking as $userTracking) {
             $userInfo = api_get_user_info_from_username($userTracking[3]);
             if (empty($userInfo)) {
                 continue;
             }
             $userId = $userInfo['user_id'];
-            if ($userTracking[5] === '100%') {
+            if ('100%' === $userTracking[5]) {
                 $numberStudentsCompletedLP++;
             }
             $averageStudentTestScore = substr($userTracking[7], 0, -1);
             $averageStudentsTestScore += $averageStudentTestScore;
 
-            if ($averageStudentTestScore === '100') {
+            if ('100' === $averageStudentTestScore) {
                 $reducedAverage = 9;
             } else {
                 $reducedAverage = floor($averageStudentTestScore / 10);
diff --git a/public/main/tracking/course_log_events.php b/public/main/tracking/course_log_events.php
index 60987eb271..e7042dec46 100644
--- a/public/main/tracking/course_log_events.php
+++ b/public/main/tracking/course_log_events.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.tracking
- */
 require_once __DIR__.'/../inc/global.inc.php';
 $this_section = SECTION_COURSES;
 
@@ -19,8 +16,8 @@ if (!$is_allowedToTrack) {
 }
 
 // Starting the output buffering when we are exporting the information.
-$export_csv = isset($_GET['export']) && $_GET['export'] == 'csv' ? true : false;
-$exportXls = isset($_GET['export']) && $_GET['export'] == 'xls' ? true : false;
+$export_csv = isset($_GET['export']) && 'csv' == $_GET['export'] ? true : false;
+$exportXls = isset($_GET['export']) && 'xls' == $_GET['export'] ? true : false;
 $keyword = isset($_GET['keyword']) ? Security::remove_XSS($_GET['keyword']) : '';
 
 // jqgrid will use this URL to do the selects
diff --git a/public/main/tracking/course_log_groups.php b/public/main/tracking/course_log_groups.php
index 30bee0b4be..ae5e4e486a 100644
--- a/public/main/tracking/course_log_groups.php
+++ b/public/main/tracking/course_log_groups.php
@@ -11,7 +11,7 @@ $course_code = api_get_course_id();
 $sessionId = api_get_session_id();
 
 $this_section = SECTION_COURSES;
-if ($from == 'myspace') {
+if ('myspace' == $from) {
     $from_myspace = true;
     $this_section = "session_my_space";
 }
diff --git a/public/main/tracking/course_log_resources.php b/public/main/tracking/course_log_resources.php
index 5d0121834f..c35a5c2bc8 100644
--- a/public/main/tracking/course_log_resources.php
+++ b/public/main/tracking/course_log_resources.php
@@ -1,21 +1,18 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.tracking
- */
 require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_TRACKING;
 
 $from_myspace = false;
 $from = isset($_GET['from']) ? $_GET['from'] : null;
 // Starting the output buffering when we are exporting the information.
-$export_csv = isset($_GET['export']) && $_GET['export'] == 'csv' ? true : false;
-$exportXls = isset($_GET['export']) && $_GET['export'] == 'xls' ? true : false;
+$export_csv = isset($_GET['export']) && 'csv' == $_GET['export'] ? true : false;
+$exportXls = isset($_GET['export']) && 'xls' == $_GET['export'] ? true : false;
 $session_id = intval($_REQUEST['id_session']);
 
 $this_section = SECTION_COURSES;
-if ($from == 'myspace') {
+if ('myspace' == $from) {
     $from_myspace = true;
     $this_section = 'session_my_space';
 }
@@ -76,7 +73,7 @@ if (empty($session_id)) {
 }
 
 // Breadcrumbs.
-if (isset($_GET['origin']) && $_GET['origin'] == 'resume_session') {
+if (isset($_GET['origin']) && 'resume_session' == $_GET['origin']) {
     $interbreadcrumb[] = [
         'url' => api_get_path(WEB_CODE_PATH).'admin/index.php',
         'name' => get_lang('Administration'),
diff --git a/public/main/tracking/course_log_tools.php b/public/main/tracking/course_log_tools.php
index d584ef02b6..100fe2d49b 100644
--- a/public/main/tracking/course_log_tools.php
+++ b/public/main/tracking/course_log_tools.php
@@ -3,9 +3,6 @@
 
 use ChamiloSession as Session;
 
-/**
- * @package chamilo.tracking
- */
 require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_TRACKING;
 
@@ -15,7 +12,7 @@ $from_myspace = false;
 $from = isset($_GET['from']) ? $_GET['from'] : null;
 
 $this_section = SECTION_COURSES;
-if ($from == 'myspace') {
+if ('myspace' == $from) {
     $from_myspace = true;
     $this_section = 'session_my_space';
 }
@@ -47,7 +44,7 @@ if (!empty($groupId)) {
 $TABLEQUIZ = Database::get_course_table(TABLE_QUIZ_TEST);
 
 // Starting the output buffering when we are exporting the information.
-$export_csv = isset($_GET['export']) && $_GET['export'] == 'csv' ? true : false;
+$export_csv = isset($_GET['export']) && 'csv' == $_GET['export'] ? true : false;
 $session_id = intval($_REQUEST['id_session']);
 
 if ($export_csv) {
@@ -59,7 +56,7 @@ if ($export_csv) {
 $csv_content = [];
 
 // Breadcrumbs.
-if (isset($_GET['origin']) && $_GET['origin'] == 'resume_session') {
+if (isset($_GET['origin']) && 'resume_session' == $_GET['origin']) {
     $interbreadcrumb[] = ['url' => '../admin/index.php', 'name' => get_lang('Administration')];
     $interbreadcrumb[] = ['url' => '../session/session_list.php', 'name' => get_lang('Session list')];
     $interbreadcrumb[] = [
@@ -210,7 +207,7 @@ if ($exerciseReporting) {
                     $quiz_avg_score += $avg_student_score;
                 }
             }
-            $studentCount = ($studentCount == 0 || is_null($studentCount) || $studentCount == '') ? 1 : $studentCount;
+            $studentCount = (0 == $studentCount || is_null($studentCount) || '' == $studentCount) ? 1 : $studentCount;
             $quiz_avg_score = round(($quiz_avg_score / $studentCount), 2).'%';
             $url = api_get_path(WEB_CODE_PATH).'exercise/overview.php?exerciseId='.$quiz['id'].$course_path_params;
 
diff --git a/public/main/tracking/course_session_report.php b/public/main/tracking/course_session_report.php
index 0256215aa9..0b76e94f25 100644
--- a/public/main/tracking/course_session_report.php
+++ b/public/main/tracking/course_session_report.php
@@ -3,8 +3,6 @@
 
 /**
  * Report.
- *
- * @package chamilo.tracking
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -40,7 +38,7 @@ $my_session_list = [];
 foreach ($session_list as $sesion_item) {
     $my_session_list[$sesion_item['id']] = $sesion_item['name'];
 }
-if (count($session_list) == 0) {
+if (0 == count($session_list)) {
     $my_session_list[0] = get_lang('none');
 }
 $form->addElement('select', 'session_id', get_lang('Course sessions'), $my_session_list);
@@ -137,7 +135,7 @@ if (!empty($users) && is_array($users)) {
         $total_student = 0;
         $counter++;
         $s_css_class = 'row_even';
-        if ($counter % 2 == 0) {
+        if (0 == $counter % 2) {
             $s_css_class = 'row_odd';
         }
         $html_result .= "<tr class='$s_css_class'>
diff --git a/public/main/tracking/exams.php b/public/main/tracking/exams.php
index 705d277cb3..ffd7118511 100644
--- a/public/main/tracking/exams.php
+++ b/public/main/tracking/exams.php
@@ -3,8 +3,6 @@
 
 /**
  * Exams script.
- *
- * @package chamilo.tracking
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -188,7 +186,7 @@ if (!empty($courseList) && is_array($courseList)) {
             $exerciseCount = $exerciseCount + $exerciseCount * count($newSessionList) + $exerciseSessionCount;
 
             // Add course and session list.
-            if ($exerciseCount == 0) {
+            if (0 == $exerciseCount) {
                 $exerciseCount = 2;
             }
             $html .= "<tr>
@@ -202,7 +200,7 @@ if (!empty($courseList) && is_array($courseList)) {
         $result = Database::query($sql);
 
         // If main tool is visible.
-        if (Database::result($result, 0, 'visibility') == 1) {
+        if (1 == Database::result($result, 0, 'visibility')) {
             // Getting the exam list.
             if ($global) {
                 $sql = "SELECT quiz.title, id, session_id
@@ -572,7 +570,7 @@ function processStudentList($filter_score, $global, $exercise, $courseInfo, $ses
 
         $percentageScore = 0;
 
-        if ($weighting != 0) {
+        if (0 != $weighting) {
             $percentageScore = round(($score * 100) / $weighting);
         }
 
@@ -651,7 +649,7 @@ function processStudentList($filter_score, $global, $exercise, $courseInfo, $ses
         if (!empty($studentResult)) {
             $studentResultEmpty = $studentResultContent = [];
             foreach ($studentResult as $row) {
-                if ($row['score'] == '-') {
+                if ('-' == $row['score']) {
                     $studentResultEmpty[] = $row;
                 } else {
                     $studentResultContent[] = $row;
diff --git a/public/main/tracking/lp_results_by_user.php b/public/main/tracking/lp_results_by_user.php
index 6a588671a0..def7cfe108 100644
--- a/public/main/tracking/lp_results_by_user.php
+++ b/public/main/tracking/lp_results_by_user.php
@@ -5,8 +5,6 @@
  * Exercise results from Learning paths.
  *
  * @todo implement pagination
- *
- * @package chamilo.tracking
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/tracking/question_course_report.php b/public/main/tracking/question_course_report.php
index 21855a96f4..f19712e8d9 100644
--- a/public/main/tracking/question_course_report.php
+++ b/public/main/tracking/question_course_report.php
@@ -3,8 +3,6 @@
 
 /**
  * Report.
- *
- * @package chamilo.tracking
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -187,7 +185,7 @@ if (!empty($main_question_list) && is_array($main_question_list)) {
         $total_student = 0;
         $counter++;
         $s_css_class = 'row_even';
-        if ($counter % 2 == 0) {
+        if (0 == $counter % 2) {
             $s_css_class = 'row_odd';
         }
         $html_result .= "<tr class='$s_css_class'>
diff --git a/public/main/tracking/total_time.php b/public/main/tracking/total_time.php
index c37fbac6de..cdddbb0bcf 100644
--- a/public/main/tracking/total_time.php
+++ b/public/main/tracking/total_time.php
@@ -3,9 +3,6 @@
 
 use ChamiloSession as Session;
 
-/**
- * @package chamilo.tracking
- */
 require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_TRACKING;
 
@@ -15,11 +12,11 @@ $from_myspace = false;
 $from = isset($_GET['from']) ? $_GET['from'] : null;
 
 // Starting the output buffering when we are exporting the information.
-$export_csv = isset($_GET['export']) && $_GET['export'] == 'csv' ? true : false;
+$export_csv = isset($_GET['export']) && 'csv' == $_GET['export'] ? true : false;
 $session_id = isset($_REQUEST['id_session']) ? intval($_REQUEST['id_session']) : 0;
 
 $this_section = SECTION_COURSES;
-if ($from == 'myspace') {
+if ('myspace' == $from) {
     $from_myspace = true;
     $this_section = 'session_my_space';
 }
@@ -95,7 +92,7 @@ $TABLEQUIZ = Database::get_course_table(TABLE_QUIZ_TEST);
 $sessionId = api_get_session_id();
 
 // Breadcrumbs.
-if (isset($_GET['origin']) && $_GET['origin'] == 'resume_session') {
+if (isset($_GET['origin']) && 'resume_session' == $_GET['origin']) {
     $interbreadcrumb[] = [
         'url' => '../admin/index.php',
         'name' => get_lang('Administration'),
diff --git a/public/main/upload/index.php b/public/main/upload/index.php
index 336bb130ee..5fb67e0951 100644
--- a/public/main/upload/index.php
+++ b/public/main/upload/index.php
@@ -13,8 +13,6 @@ use ChamiloSession as Session;
  * The script respects the strategical split between process and display, so the first
  * part is only processing code (init, process, display preparation) and the second
  * part is only display (HTML)
- *
- * @package chamilo.upload
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
@@ -64,11 +62,11 @@ function get_zip_files_in_garbage()
 {
     $list = [];
     $dh = opendir(api_get_path(SYS_ARCHIVE_PATH));
-    if ($dh === false) {
+    if (false === $dh) {
         //ignore
     } else {
         while ($entry = readdir($dh)) {
-            if (substr($entry, 0, 1) == '.') {
+            if ('.' == substr($entry, 0, 1)) {
                 /* ignore files starting with . */
             } else {
                 if (preg_match('/^.*\.zip$/i', $entry)) {
@@ -123,7 +121,7 @@ $form->addRule('user_file', get_lang('Required field'), 'required');
 unset($content_origins[0]);
 unset($content_origins[1]);
 
-if (api_get_setting('search_enabled') == 'true') {
+if ('true' == api_get_setting('search_enabled')) {
     $form->addElement('checkbox', 'index_document', '', get_lang('Index document text?'));
     $specific_fields = get_specific_field_list();
     foreach ($specific_fields as $specific_field) {
diff --git a/public/main/upload/upload.document.php b/public/main/upload/upload.document.php
index 61f8ec41c6..369184a95c 100644
--- a/public/main/upload/upload.document.php
+++ b/public/main/upload/upload.document.php
@@ -7,8 +7,6 @@
  *
  * @todo check if this file is deprecated ... jmontoya
  *
- * @package chamilo.upload
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 $_course = api_get_course_info();
@@ -132,8 +130,8 @@ if (isset($_POST['submit_image'])) {
     }
 }
 //they want to create a directory
-if (isset($_POST['create_dir']) && $_POST['dirname'] != '') {
-    $added_slash = $path == '/' ? '' : '/';
+if (isset($_POST['create_dir']) && '' != $_POST['dirname']) {
+    $added_slash = '/' == $path ? '' : '/';
     $dir_name = $path.$added_slash.api_replace_dangerous_char($_POST['dirname']);
     $created_dir = create_unexisting_directory(
         $_course,
diff --git a/public/main/upload/upload.php b/public/main/upload/upload.php
index 98ae183622..3e315d69f1 100644
--- a/public/main/upload/upload.php
+++ b/public/main/upload/upload.php
@@ -5,8 +5,6 @@
  * Action controller for the upload process. The display scripts (web forms) redirect
  * the process here to do what needs to be done with each file.
  *
- * @package chamilo.upload
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 require_once __DIR__.'/../inc/global.inc.php';
diff --git a/public/main/upload/upload.scorm.php b/public/main/upload/upload.scorm.php
index 5b91fb8bf4..808c90f1ff 100644
--- a/public/main/upload/upload.scorm.php
+++ b/public/main/upload/upload.scorm.php
@@ -5,8 +5,6 @@
  * Process part of the SCORM sub-process for upload. This script MUST BE included by upload/index.php
  * as it prepares most of the variables needed here.
  *
- * @package chamilo.upload
- *
  * @author Yannick Warnier <ywarnier@beeznest.org>
  */
 $cwdir = getcwd();
@@ -15,7 +13,7 @@ require_once '../lp/lp_upload.php';
 // Reinit current working directory as many functions in upload change it
 chdir($cwdir);
 
-if (api_get_setting('search_enabled') === 'true') {
+if ('true' === api_get_setting('search_enabled')) {
     require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
     $specific_fields = get_specific_field_list();
 
diff --git a/public/main/upload/upload_ppt.php b/public/main/upload/upload_ppt.php
index 4c49df9f1d..9e9faab500 100644
--- a/public/main/upload/upload_ppt.php
+++ b/public/main/upload/upload_ppt.php
@@ -20,8 +20,8 @@ if (isset($_POST['convert'])) {
             $allowed_extensions
         )) {
             require_once api_get_path(SYS_CODE_PATH).'lp/lp_upload.php';
-            if (isset($o_ppt) && $first_item_id != 0) {
-                if (api_get_setting('search_enabled') == 'true') {
+            if (isset($o_ppt) && 0 != $first_item_id) {
+                if ('true' == api_get_setting('search_enabled')) {
                     require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
                     $specific_fields = get_specific_field_list();
                     foreach ($specific_fields as $specific_field) {
@@ -85,7 +85,7 @@ $form->addElement('file', 'user_file', [Display::return_icon('powerpoint_big.gif
 $form->addElement('checkbox', 'take_slide_name', '', get_lang('Use the slides names as course learning object names'));
 $options = ChamiloApi::getDocumentConversionSizes();
 $form->addElement('select', 'slide_size', get_lang('Size of the slides'), $options);
-if (api_get_setting('search_enabled') === 'true') {
+if ('true' === api_get_setting('search_enabled')) {
     require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
     $specific_fields = get_specific_field_list();
     $form->addElement('checkbox', 'index_document', '', get_lang('Index document text?ument'));
diff --git a/public/main/upload/upload_word.php b/public/main/upload/upload_word.php
index 9cb7acd9fc..1ac1ec62ac 100644
--- a/public/main/upload/upload_word.php
+++ b/public/main/upload/upload_word.php
@@ -24,7 +24,7 @@ $form_style = '<style>
 
 $htmlHeadXtra[] = $form_style;
 
-if (api_get_setting('search_enabled') == 'true') {
+if ('true' == api_get_setting('search_enabled')) {
     $specific_fields = get_specific_field_list();
 }
 
@@ -34,9 +34,9 @@ if (isset($_POST['convert'])) {
         $allowed_extensions = ['doc', 'docx', 'odt', 'txt', 'sxw', 'rtf'];
         if (in_array(strtolower(pathinfo($_FILES['user_file']['name'], PATHINFO_EXTENSION)), $allowed_extensions)) {
             require '../lp/lp_upload.php';
-            if (isset($o_doc) && $first_item_id != 0) {
+            if (isset($o_doc) && 0 != $first_item_id) {
                 // Search-related section
-                if (api_get_setting('search_enabled') == 'true') {
+                if ('true' == api_get_setting('search_enabled')) {
                     require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
                     $specific_fields = get_specific_field_list();
 
@@ -153,7 +153,7 @@ EOT;
 $renderer->setCustomElementTemplate($user_file_template);
 
 $form->addElement('file', 'user_file', Display::return_icon('word_big.gif'));
-if (api_get_setting('search_enabled') === 'true') {
+if ('true' === api_get_setting('search_enabled')) {
     $form->addElement('checkbox', 'index_document', '', get_lang('Index document text?ument'));
     $form->addElement('html', '<br />');
     $form->addElement(
diff --git a/public/main/user/add_users_to_session.php b/public/main/user/add_users_to_session.php
index 77309d73d5..14e2995137 100644
--- a/public/main/user/add_users_to_session.php
+++ b/public/main/user/add_users_to_session.php
@@ -31,7 +31,7 @@ if (api_is_platform_admin()) {
 }
 $allowTutors = api_get_setting('allow_tutors_to_assign_students_to_session');
 $extra_field_list = [];
-if ($allowTutors == 'true') {
+if ('true' == $allowTutors) {
     // Database Table Definitions
     $tbl_session = Database::get_main_table(TABLE_MAIN_SESSION);
     $tbl_course = Database::get_main_table(TABLE_MAIN_COURSE);
@@ -42,7 +42,7 @@ if ($allowTutors == 'true') {
     $tool_name = get_lang('Subscribe users to this session');
     $add_type = 'unique';
 
-    if (isset($_REQUEST['add_type']) && $_REQUEST['add_type'] != '') {
+    if (isset($_REQUEST['add_type']) && '' != $_REQUEST['add_type']) {
         $add_type = Security::remove_XSS($_REQUEST['add_type']);
     }
 
@@ -54,7 +54,7 @@ if ($allowTutors == 'true') {
     if (is_array($extra_field_list)) {
         foreach ($extra_field_list as $extra_field) {
             //if is enabled to filter and is a "<select>" field type
-            if ($extra_field[8] == 1 && $extra_field[2] == 4) {
+            if (1 == $extra_field[8] && 4 == $extra_field[2]) {
                 $new_field_list[] = [
                     'name' => $extra_field[3],
                     'variable' => $extra_field[1],
@@ -74,7 +74,7 @@ if ($allowTutors == 'true') {
 
         if (!empty($needle) && !empty($type)) {
             //normal behaviour
-            if ($type == 'any_session' && $needle == 'false') {
+            if ('any_session' == $type && 'false' == $needle) {
                 $type = 'multiple';
                 $needle = '';
             }
@@ -140,7 +140,7 @@ if ($allowTutors == 'true') {
             if (api_is_multiple_url_enabled()) {
                 $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
                 $access_url_id = api_get_current_access_url_id();
-                if ($access_url_id != -1) {
+                if (-1 != $access_url_id) {
                     switch ($type) {
                         case 'single':
                             $sql = 'SELECT user.user_id, username, lastname, firstname
@@ -184,7 +184,7 @@ if ($allowTutors == 'true') {
 
             $rs = Database::query($sql);
             $i = 0;
-            if ($type == 'single') {
+            if ('single' == $type) {
                 while ($user = Database::fetch_array($rs)) {
                     $i++;
                     if ($i <= 10) {
@@ -268,7 +268,7 @@ if ($allowTutors == 'true') {
             $UserList = [];
         }
 
-        if ($form_sent == 1) {
+        if (1 == $form_sent) {
             //added a parameter to send emails when registering a user
             SessionManager::subscribeUsersToSession($id_session, $UserList, null, true);
             header('Location: resume_session.php?id_session='.$id_session);
@@ -279,7 +279,7 @@ if ($allowTutors == 'true') {
     $session_info = SessionManager::fetch($id_session);
     Display::display_header($tool_name);
     $nosessionUsersList = $sessionUsersList = [];
-    $ajax_search = $add_type === 'unique' ? true : false;
+    $ajax_search = 'unique' === $add_type ? true : false;
 
     $order_clause = api_sort_by_first_name() ? ' ORDER BY firstname, lastname, username' : ' ORDER BY lastname, firstname, username';
     if ($ajax_search) {
@@ -295,7 +295,7 @@ if ($allowTutors == 'true') {
         if (api_is_multiple_url_enabled()) {
             $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql = "SELECT u.user_id, lastname, firstname, username, session_id
                         FROM $tbl_user u
                         INNER JOIN $tbl_session_rel_user
@@ -324,7 +324,7 @@ if ($allowTutors == 'true') {
                 foreach ($new_field_list as $new_field) {
                     $varname = 'field_'.$new_field['variable'];
                     if (UserManager::is_extra_field_available($new_field['variable'])) {
-                        if (isset($_POST[$varname]) && $_POST[$varname] != '0') {
+                        if (isset($_POST[$varname]) && '0' != $_POST[$varname]) {
                             $use_extra_fields = true;
                             $extra_field_result[] = UserManager::get_extra_user_data_by_value(
                                 $new_field['variable'],
@@ -391,7 +391,7 @@ if ($allowTutors == 'true') {
         if (api_is_multiple_url_enabled()) {
             $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql = "SELECT  u.user_id, lastname, firstname, username, session_id
                         FROM $tbl_user u
                         LEFT JOIN $tbl_session_rel_user
@@ -433,7 +433,7 @@ if ($allowTutors == 'true') {
         if (api_is_multiple_url_enabled()) {
             $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
             $access_url_id = api_get_current_access_url_id();
-            if ($access_url_id != -1) {
+            if (-1 != $access_url_id) {
                 $sql = "SELECT  u.user_id, lastname, firstname, username, session_id
                         FROM $tbl_user u
                         LEFT JOIN $tbl_session_rel_user
@@ -460,7 +460,7 @@ if ($allowTutors == 'true') {
         unset($users); //clean to free memory
     }
 
-    if ($add_type === 'multiple') {
+    if ('multiple' === $add_type) {
         $link_add_type_unique = '<a href="'.api_get_self().'?id_session='.$id_session.'&add='.Security::remove_XSS($_GET['add']).'&add_type=unique">'.
             Display::return_icon('single.gif').get_lang('Single registration').'</a>';
         $link_add_type_multiple = Display::return_icon('multiple.gif').get_lang('Multiple registration');
@@ -482,7 +482,7 @@ if ($allowTutors == 'true') {
             } ?>>
     <?php echo '<legend>'.$tool_name.' ('.$session->getName().') </legend>'; ?>
     <?php
-    if ($add_type === 'multiple') {
+    if ('multiple' === $add_type) {
         if (is_array($extra_field_list)) {
             if (is_array($new_field_list) && count($new_field_list) > 0) {
                 echo '<h3>'.get_lang('Filter users').'</h3>';
@@ -514,7 +514,7 @@ if ($allowTutors == 'true') {
         <div class="span5">
             <div class="multiple_select_header">
                 <b><?php echo get_lang('Portal users list'); ?> :</b>
-            <?php if ($add_type == 'multiple') {
+            <?php if ('multiple' == $add_type) {
         ?>
                 <?php echo get_lang('First letter (last name)'); ?> :
                     <select id="first_letter_user" name="firstLetterUser" onchange = "change_select(this.value);" >
@@ -527,7 +527,7 @@ if ($allowTutors == 'true') {
             </div>
                 <div id="content_source">
                 <?php
-                if (!($add_type == 'multiple')) {
+                if (!('multiple' == $add_type)) {
                     ?>
                   <input type="text" id="user_to_add" onkeyup="xajax_search_users(this.value,'single')" />
                   <div id="ajax_list_users_single"></div>
diff --git a/public/main/user/career_diagram.php b/public/main/user/career_diagram.php
index 925a1fa566..7a995e9998 100644
--- a/public/main/user/career_diagram.php
+++ b/public/main/user/career_diagram.php
@@ -12,7 +12,7 @@ ALTER TABLE extra_field_values modify column value longtext null;
 
 require_once __DIR__.'/../inc/global.inc.php';
 
-if (api_get_configuration_value('allow_career_diagram') == false) {
+if (false == api_get_configuration_value('allow_career_diagram')) {
     api_not_allowed(true);
 }
 
@@ -33,7 +33,7 @@ if (empty($careerInfo)) {
 $userId = api_get_user_id();
 $allow = UserManager::userHasCareer($userId, $careerId) || api_is_platform_admin();
 
-if ($allow === false) {
+if (false === $allow) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/user/class.php b/public/main/user/class.php
index 9519e22678..69d894168d 100644
--- a/public/main/user/class.php
+++ b/public/main/user/class.php
@@ -1,15 +1,12 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.user
- */
 require_once __DIR__.'/../inc/global.inc.php';
 $this_section = SECTION_COURSES;
 
 api_protect_course_script(true, false, 'user');
 
-if (api_get_setting('allow_user_course_subscription_by_course_admin') == 'false') {
+if ('false' == api_get_setting('allow_user_course_subscription_by_course_admin')) {
     if (!api_is_platform_admin()) {
         api_not_allowed(true);
     }
@@ -44,7 +41,7 @@ $usergroup = new UserGroup();
 $actions = '';
 
 if (api_is_allowed_to_edit()) {
-    if ($type === 'registered') {
+    if ('registered' === $type) {
         $actionsLeft .= '<a href="class.php?'.api_get_cidreq().'&type=not_registered">'.
             Display::return_icon('add-class.png', get_lang('Add classes to a course'), [], ICON_SIZE_MEDIUM).'</a>';
     } else {
diff --git a/public/main/user/classes.php b/public/main/user/classes.php
index 3f25bd21bb..94a33d8830 100644
--- a/public/main/user/classes.php
+++ b/public/main/user/classes.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 /**
- * @package chamilo.classes
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 $cidReset = true;
diff --git a/public/main/user/resume_session.php b/public/main/user/resume_session.php
index f708674dd8..159de6f232 100644
--- a/public/main/user/resume_session.php
+++ b/public/main/user/resume_session.php
@@ -3,8 +3,6 @@
 
 /**
  *	@author Bart Mollet, Julio Montoya lot of fixes
- *
- *	@package chamilo.admin
  */
 $cidReset = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -17,7 +15,7 @@ SessionManager::protect_teacher_session_edit($id_session);
 $tool_name = get_lang('Session overview');
 
 $allowTutors = api_get_setting('allow_tutors_to_assign_students_to_session');
-if ($allowTutors === 'true') {
+if ('true' === $allowTutors) {
     // Database Table Definitions
     $tbl_session = Database::get_main_table(TABLE_MAIN_SESSION);
     $tbl_session_rel_class = Database::get_main_table(TABLE_MAIN_SESSION_CLASS);
@@ -149,16 +147,16 @@ if ($allowTutors === 'true') {
         <td><?php echo get_lang('Date'); ?> :</td>
         <td>
         <?php
-        if ($session['access_start_date'] == '00-00-0000' && $session['access_end_date'] == '00-00-0000') {
+        if ('00-00-0000' == $session['access_start_date'] && '00-00-0000' == $session['access_end_date']) {
             echo get_lang('No time limits');
         } else {
-            if ($session['access_start_date'] != '00-00-0000') {
+            if ('00-00-0000' != $session['access_start_date']) {
                 //$session['date_start'] = Display::tag('i', get_lang('No time limits'));
                 $session['access_start_date'] = get_lang('From').' '.$session['access_start_date'];
             } else {
                 $session['access_start_date'] = '';
             }
-            if ($session['access_end_date'] == '00-00-0000') {
+            if ('00-00-0000' == $session['access_end_date']) {
                 $session['access_end_date'] = '';
             } else {
                 $session['access_end_date'] = get_lang('Until').' '.$session['access_end_date'];
@@ -189,11 +187,11 @@ if ($allowTutors === 'true') {
             <?php echo api_ucfirst(get_lang('Visibility after end date')); ?> :
         </td>
         <td>
-            <?php if ($session['visibility'] == 1) {
+            <?php if (1 == $session['visibility']) {
             echo get_lang('Read only');
-        } elseif ($session['visibility'] == 2) {
+        } elseif (2 == $session['visibility']) {
             echo get_lang('Visible');
-        } elseif ($session['visibility'] == 3) {
+        } elseif (3 == $session['visibility']) {
             echo api_ucfirst(get_lang('invisible'));
         } ?>
         </td>
@@ -224,7 +222,7 @@ if ($allowTutors === 'true') {
       <th width="20%"><?php echo get_lang('Users number'); ?></th>
     </tr>
     <?php
-    if ($session['nbr_courses'] == 0) {
+    if (0 == $session['nbr_courses']) {
         echo '<tr>
             <td colspan="4">'.get_lang('No course for this session').'</td>
             </tr>';
@@ -307,7 +305,7 @@ if ($allowTutors === 'true') {
         </tr>
     <?php
 
-    if ($session['nbr_users'] == 0) {
+    if (0 == $session['nbr_users']) {
         echo '<tr>
                 <td colspan="2">'.get_lang('No Users for this session').'</td>
             </tr>';
diff --git a/public/main/user/session_list.php b/public/main/user/session_list.php
index c6be47f1d9..be5499ce6e 100644
--- a/public/main/user/session_list.php
+++ b/public/main/user/session_list.php
@@ -3,8 +3,6 @@
 
 /**
  * List sessions in an efficient and usable way.
- *
- * @package chamilo.admin
  */
 $cidReset = true;
 
@@ -18,7 +16,7 @@ $htmlHeadXtra[] = api_get_jqgrid_js();
 $tool_name = get_lang('Session list');
 $allowTutors = api_get_setting('allow_tutors_to_assign_students_to_session');
 
-if ($allowTutors !== 'true') {
+if ('true' !== $allowTutors) {
     api_not_allowed(true);
 }
 
diff --git a/public/main/user/subscribe_user.php b/public/main/user/subscribe_user.php
index 4824369357..96876a4440 100644
--- a/public/main/user/subscribe_user.php
+++ b/public/main/user/subscribe_user.php
@@ -7,8 +7,6 @@ use ExtraField as ExtraFieldModel;
 /**
  * This script allows teachers to subscribe existing users
  * to their course.
- *
- * @package chamilo.user
  */
 require_once __DIR__.'/../inc/global.inc.php';
 $current_course_tool = TOOL_USER;
@@ -19,7 +17,7 @@ $this_section = SECTION_COURSES;
 // notice for unauthorized people.
 api_protect_course_script(true);
 
-if (api_get_setting('allow_user_course_subscription_by_course_admin') === 'false') {
+if ('false' === api_get_setting('allow_user_course_subscription_by_course_admin')) {
     if (!api_is_platform_admin()) {
         api_not_allowed(true);
     }
@@ -36,7 +34,7 @@ $keyword = isset($_REQUEST['keyword']) ? Security::remove_XSS($_REQUEST['keyword
 
 $courseInfo = api_get_course_info();
 
-if ($type == COURSEMANAGER) {
+if (COURSEMANAGER == $type) {
     $tool_name = get_lang('Enroll users to courseAsTeacher');
 }
 
@@ -60,7 +58,7 @@ $list_not_Registerister_user = '';
 if (isset($_REQUEST['Registerister'])) {
     $userInfo = api_get_user_info($_REQUEST['user_id']);
     if ($userInfo) {
-        if ($type === COURSEMANAGER) {
+        if (COURSEMANAGER === $type) {
             if (!empty($sessionId)) {
                 $message = $userInfo['complete_name_with_username'].' '.get_lang('has been Registeristered to your course');
                 SessionManager::set_coach_to_course_session(
@@ -95,7 +93,7 @@ if (isset($_POST['action'])) {
                 foreach ($_POST['user'] as $index => $user_id) {
                     $userInfo = api_get_user_info($user_id);
                     if ($userInfo) {
-                        if ($type === COURSEMANAGER) {
+                        if (COURSEMANAGER === $type) {
                             if (!empty($sessionId)) {
                                 $message = $userInfo['complete_name_with_username'].' '.get_lang('has been Registeristered to your course');
                                 $result = SessionManager::set_coach_to_course_session(
@@ -152,7 +150,7 @@ if (api_is_western_name_order()) {
     $table->set_header($col++, get_lang('First name'));
 }
 
-if (api_get_setting('show_email_addresses') == 'true') {
+if ('true' == api_get_setting('show_email_addresses')) {
     $table->set_header($col++, get_lang('e-mail'));
     $table->set_column_filter($col - 1, 'email_filter');
 }
@@ -189,7 +187,7 @@ if (isset($_GET['subscribe_user_filter_value']) && !empty($_GET['subscribe_user_
         Display::return_icon('clean_group.gif').' '.get_lang('Clear filter results').'</a>';
 }
 $extraForm = '';
-if (api_get_setting('ProfilingFilterAddingUsers') === 'true') {
+if ('true' === api_get_setting('ProfilingFilterAddingUsers')) {
     $extraForm = display_extra_profile_fields_filter();
 }
 
@@ -208,7 +206,7 @@ $form->addElement('hidden', 'cidReq', api_get_course_id());
 $form->addButtonSearch(get_lang('Search'));
 echo Display::toolbarAction('toolbar-subscriber', [$actionsLeft, $extraForm, $form->returnForm()], [4, 4, 4]);
 
-$option = $type == COURSEMANAGER ? 2 : 1;
+$option = COURSEMANAGER == $type ? 2 : 1;
 echo UserManager::getUserSubscriptionTab($option);
 
 // Display table
@@ -231,8 +229,8 @@ function get_number_of_users()
     $courseCode = api_get_course_id();
     $sessionId = api_get_session_id();
 
-    if (isset($_REQUEST['type']) && $_REQUEST['type'] === 'teacher') {
-        if (api_get_session_id() != 0) {
+    if (isset($_REQUEST['type']) && 'teacher' === $_REQUEST['type']) {
+        if (0 != api_get_session_id()) {
             $sql = "SELECT COUNT(u.id)
                     FROM $user_table u
                     LEFT JOIN $tbl_session_rel_course_user cu
@@ -247,7 +245,7 @@ function get_number_of_users()
 
             if (api_is_multiple_url_enabled()) {
                 $url_access_id = api_get_current_access_url_id();
-                if ($url_access_id != -1) {
+                if (-1 != $url_access_id) {
                     $tbl_url_rel_user = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
                     $sql = "SELECT COUNT(u.id)
                             FROM $user_table u
@@ -274,7 +272,7 @@ function get_number_of_users()
 
             if (api_is_multiple_url_enabled()) {
                 $url_access_id = api_get_current_access_url_id();
-                if ($url_access_id != -1) {
+                if (-1 != $url_access_id) {
                     $tbl_url_rel_user = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
 
                     $sql = "SELECT COUNT(u.id)
@@ -289,7 +287,7 @@ function get_number_of_users()
         }
     } else {
         // students
-        if ($sessionId != 0) {
+        if (0 != $sessionId) {
             $sql = "SELECT COUNT(u.id)
                     FROM $user_table u
                     LEFT JOIN $tbl_session_rel_course_user cu
@@ -304,7 +302,7 @@ function get_number_of_users()
 
             if (api_is_multiple_url_enabled()) {
                 $url_access_id = api_get_current_access_url_id();
-                if ($url_access_id != -1) {
+                if (-1 != $url_access_id) {
                     $tbl_url_rel_user = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
                     $sql = "SELECT COUNT(u.id)
                             FROM $user_table u
@@ -331,7 +329,7 @@ function get_number_of_users()
             // we change the SQL when we have a filter
             if (isset($_GET['subscribe_user_filter_value']) &&
                 !empty($_GET['subscribe_user_filter_value']) &&
-                api_get_setting('ProfilingFilterAddingUsers') === 'true'
+                'true' === api_get_setting('ProfilingFilterAddingUsers')
             ) {
                 $field_identification = explode('*', $_GET['subscribe_user_filter_value']);
                 $sql .= "
@@ -350,7 +348,7 @@ function get_number_of_users()
             if (api_is_multiple_url_enabled()) {
                 $url_access_id = api_get_current_access_url_id();
 
-                if ($url_access_id != -1) {
+                if (-1 != $url_access_id) {
                     $tbl_url_rel_user = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
                     $sql = "SELECT COUNT(u.id)
                             FROM $user_table u
@@ -376,7 +374,7 @@ function get_number_of_users()
         )";
 
         // we also want to search for users who have something in their profile fields that matches the keyword
-        if (api_get_setting('ProfilingFilterAddingUsers') === 'true') {
+        if ('true' === api_get_setting('ProfilingFilterAddingUsers')) {
             $additional_users = search_additional_profile_fields($keyword);
         }
 
@@ -427,7 +425,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
     // adding teachers
     $is_western_name_order = api_is_western_name_order();
 
-    if (api_get_setting('show_email_addresses') === 'true') {
+    if ('true' === api_get_setting('show_email_addresses')) {
         $select_fields = "u.id              AS col0,
                 u.official_code        AS col1,
                 ".($is_western_name_order
@@ -449,7 +447,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
                 u.active               AS col4,
                 u.user_id              AS col5";
     }
-    if (isset($_REQUEST['type']) && $_REQUEST['type'] == COURSEMANAGER) {
+    if (isset($_REQUEST['type']) && COURSEMANAGER == $_REQUEST['type']) {
         // adding a teacher through a session
         if (!empty($sessionId)) {
             $sql = "SELECT $select_fields
@@ -465,7 +463,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
             // applying the filter of the additional user profile fields
             if (isset($_GET['subscribe_user_filter_value']) &&
                 !empty($_GET['subscribe_user_filter_value']) &&
-                api_get_setting('ProfilingFilterAddingUsers') == 'true'
+                'true' == api_get_setting('ProfilingFilterAddingUsers')
             ) {
                 $field_identification = explode('*', $_GET['subscribe_user_filter_value']);
                 $sql .= "
@@ -490,7 +488,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
             // applying the filter of the additional user profile fields
             if (isset($_GET['subscribe_user_filter_value']) &&
                 !empty($_GET['subscribe_user_filter_value']) &&
-                api_get_setting('ProfilingFilterAddingUsers') == 'true'
+                'true' == api_get_setting('ProfilingFilterAddingUsers')
             ) {
                 $field_identification = explode('*', $_GET['subscribe_user_filter_value']);
                 $sql .= "
@@ -506,7 +504,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
 
             // adding a teacher NOT trough a session on a portal with multiple URLs
             if (api_is_multiple_url_enabled()) {
-                if ($url_access_id != -1) {
+                if (-1 != $url_access_id) {
                     $sql = "SELECT $select_fields
                             FROM $user_table u
                             LEFT JOIN $course_user_table cu
@@ -517,7 +515,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
                     // applying the filter of the additional user profile fields
                     if (isset($_GET['subscribe_user_filter_value']) &&
                         !empty($_GET['subscribe_user_filter_value']) &&
-                        api_get_setting('ProfilingFilterAddingUsers') == 'true'
+                        'true' == api_get_setting('ProfilingFilterAddingUsers')
                     ) {
                         $field_identification = explode('*', $_GET['subscribe_user_filter_value']);
                         $sql .= "
@@ -597,7 +595,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
 
             //showing only the courses of the current Chamilo access_url_id
             if (api_is_multiple_url_enabled()) {
-                if ($url_access_id != -1) {
+                if (-1 != $url_access_id) {
                     $sql = "SELECT $select_fields
                         FROM $user_table u
                         LEFT JOIN $course_user_table cu
@@ -608,7 +606,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
                     // applying the filter of the additional user profile fields
                     if (isset($_GET['subscribe_user_filter_value']) &&
                         !empty($_GET['subscribe_user_filter_value']) &&
-                        api_get_setting('ProfilingFilterAddingUsers') == 'true'
+                        'true' == api_get_setting('ProfilingFilterAddingUsers')
                     ) {
                         $field_identification = explode('*', $_GET['subscribe_user_filter_value']);
                         $sql .= "
@@ -641,7 +639,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
                     )
                 ";
 
-        if (api_get_setting('ProfilingFilterAddingUsers') === 'true') {
+        if ('true' === api_get_setting('ProfilingFilterAddingUsers')) {
             // we also want to search for users who have something in
             // their profile fields that matches the keyword
             $additional_users = search_additional_profile_fields($keyword);
@@ -694,7 +692,7 @@ function email_filter($email)
  */
 function Register_filter($user_id)
 {
-    if (isset($_REQUEST['type']) && $_REQUEST['type'] == COURSEMANAGER) {
+    if (isset($_REQUEST['type']) && COURSEMANAGER == $_REQUEST['type']) {
         $type = COURSEMANAGER;
     } else {
         $type = STUDENT;
@@ -721,12 +719,12 @@ function Register_filter($user_id)
 function active_filter($active, $url_params, $row)
 {
     $_user = api_get_user_info();
-    if ($active == '1') {
+    if ('1' == $active) {
         $action = 'Accountactive';
         $image = 'accept';
     }
 
-    if ($active == '0') {
+    if ('0' == $active) {
         $action = 'AccountInactive';
         $image = 'error';
     }
@@ -835,7 +833,7 @@ function display_extra_profile_fields_filter()
                 $return .= '<optgroup label="'.$field_details[3].'">';
                 foreach ($field_details[9] as $option_id => $option_details) {
                     if (isset($_GET['subscribe_user_filter_value']) &&
-                        $_GET['subscribe_user_filter_value'] == $field_details[0].'*'.$option_details[1]
+                        $field_details[0].'*'.$option_details[1] == $_GET['subscribe_user_filter_value']
                     ) {
                         $selected = 'selected="selected"';
                     } else {
diff --git a/public/main/user/user.php b/public/main/user/user.php
index d55e18aa70..df62e00819 100644
--- a/public/main/user/user.php
+++ b/public/main/user/user.php
@@ -9,8 +9,6 @@
  *
  * @author Roan Embrechts
  * @author Julio Montoya, Several fixes
- *
- * @package chamilo.user
  */
 $use_anonymous = true;
 require_once __DIR__.'/../inc/global.inc.php';
@@ -22,7 +20,7 @@ api_protect_course_script(true, false, 'user');
 
 if (!api_is_platform_admin(true)) {
     if (!api_is_course_admin() && !api_is_coach()) {
-        if (api_get_course_setting('allow_user_view_user_list') == 0) {
+        if (0 == api_get_course_setting('allow_user_view_user_list')) {
             api_not_allowed(true);
         }
     }
@@ -37,7 +35,7 @@ $_user = api_get_user_info();
 $courseCode = $course_info['code'];
 $courseId = $course_info['real_id'];
 $type = isset($_REQUEST['type']) ? (int) $_REQUEST['type'] : STUDENT;
-$canEditUsers = api_get_setting('allow_user_course_subscription_by_course_admin') == 'true' || api_is_platform_admin();
+$canEditUsers = 'true' == api_get_setting('allow_user_course_subscription_by_course_admin') || api_is_platform_admin();
 
 // Can't auto unregister from a session
 if (!empty($sessionId)) {
@@ -83,7 +81,7 @@ if (isset($_GET['action'])) {
 
             if (!empty($userId)) {
                 if (!$sessionId) {
-                    if ($userInfo['status'] != INVITEE) {
+                    if (INVITEE != $userInfo['status']) {
                         CourseManager::updateUserCourseTutor(
                             $userId,
                             $courseId,
@@ -124,7 +122,7 @@ if (isset($_GET['action'])) {
             $extra_fields = array_keys($extra_fields);
             $select_email_condition = '';
 
-            if (api_get_setting('show_email_addresses') === 'true') {
+            if ('true' === api_get_setting('show_email_addresses')) {
                 $select_email_condition = ' user.email, ';
                 if ($sort_by_first_name) {
                     $a_users[0] = [
@@ -175,12 +173,12 @@ if (isset($_GET['action'])) {
 
             $legal = '';
 
-            if (isset($course_info['activate_legal']) && $course_info['activate_legal'] == 1) {
+            if (isset($course_info['activate_legal']) && 1 == $course_info['activate_legal']) {
                 $legal = ', legal_agreement';
                 $a_users[0][] = get_lang('Legal agreement accepted');
             }
 
-            if ($_GET['format'] === 'pdf') {
+            if ('pdf' === $_GET['format']) {
                 $select_email_condition = ' user.email, ';
                 if ($is_western_name_order) {
                     $a_users[0] = [
@@ -232,7 +230,7 @@ if (isset($_GET['action'])) {
                 }
 
                 // only users no coaches/teachers
-                if ($type == COURSEMANAGER) {
+                if (COURSEMANAGER == $type) {
                     $sql .= " AND session_course_user.status = 2 ";
                 } else {
                     $sql .= " AND session_course_user.status = 0 ";
@@ -244,7 +242,7 @@ if (isset($_GET['action'])) {
 
                 while ($user = Database:: fetch_array($rs, 'ASSOC')) {
                     if (isset($user['legal_agreement'])) {
-                        if ($user['legal_agreement'] == 1) {
+                        if (1 == $user['legal_agreement']) {
                             $user['legal_agreement'] = get_lang('Yes');
                         } else {
                             $user['legal_agreement'] = get_lang('No');
@@ -263,7 +261,7 @@ if (isset($_GET['action'])) {
                         }
                     }
                     $data[] = $user;
-                    if ($_GET['format'] === 'pdf') {
+                    if ('pdf' === $_GET['format']) {
                         $user_info = api_get_user_info($user['user_id']);
                         $user_image = '<img src="'.$user_info['avatar'].'" width ="'.$user_image_pdf_size.'px" />';
 
@@ -295,7 +293,7 @@ if (isset($_GET['action'])) {
                 }
             }
 
-            if ($sessionId == 0) {
+            if (0 == $sessionId) {
                 // users directly subscribed to the course
                 $table_course_user = Database::get_main_table(TABLE_MAIN_COURSE_USER);
                 $sql = "SELECT DISTINCT
@@ -319,7 +317,7 @@ if (isset($_GET['action'])) {
                 }
 
                 // only users no teachers/coaches
-                if ($type == COURSEMANAGER) {
+                if (COURSEMANAGER == $type) {
                     $sql .= " AND course_user.status = 1 ";
                 } else {
                     $sql .= " AND course_user.status = 5 ";
@@ -331,7 +329,7 @@ if (isset($_GET['action'])) {
                 $counter = 1;
                 while ($user = Database::fetch_array($rs, 'ASSOC')) {
                     if (isset($user['legal_agreement'])) {
-                        if ($user['legal_agreement'] == 1) {
+                        if (1 == $user['legal_agreement']) {
                             $user['legal_agreement'] = get_lang('Yes');
                         } else {
                             $user['legal_agreement'] = get_lang('No');
@@ -350,7 +348,7 @@ if (isset($_GET['action'])) {
                             $user[$key] = $extra_value;
                         }
                     }
-                    if ($_GET['format'] === 'pdf') {
+                    if ('pdf' === $_GET['format']) {
                         $user_info = api_get_user_info($user['user_id']);
                         $user_image = '<img src="'.$user_info['avatar'].'" width ="'.$user_image_pdf_size.'px" />';
 
@@ -386,7 +384,7 @@ if (isset($_GET['action'])) {
             $fileName = get_lang('Learners list');
             $pdfTitle = get_lang('Learners list');
 
-            if ($type == COURSEMANAGER) {
+            if (COURSEMANAGER == $type) {
                 $fileName = get_lang('Trainers');
                 $pdfTitle = get_lang('Trainers');
             }
@@ -431,8 +429,8 @@ if (api_is_allowed_to_edit(null, true)) {
     }
 } else {
     // If student can unsubscribe
-    if (isset($_REQUEST['unregister']) && $_REQUEST['unregister'] == 'yes') {
-        if ($course_info['unsubscribe'] == 1) {
+    if (isset($_REQUEST['unregister']) && 'yes' == $_REQUEST['unregister']) {
+        if (1 == $course_info['unsubscribe']) {
             $user_id = api_get_user_id();
             CourseManager::unsubscribe_user($user_id, $course_info['code']);
             header('Location: '.api_get_path(WEB_PATH).'user_portal.php');
@@ -450,7 +448,7 @@ if (!api_is_allowed_in_course()) {
 Event::event_access_tool(TOOL_USER);
 
 $default_column = 3;
-$tableLabel = $type === STUDENT ? 'student' : 'teacher';
+$tableLabel = STUDENT === $type ? 'student' : 'teacher';
 $table = new SortableTable(
     $tableLabel.'_list',
     'get_number_of_users',
@@ -523,14 +521,14 @@ if (api_is_allowed_to_edit(null, true)) {
         $table->set_form_actions(['unsubscribe' => get_lang('Unsubscribe')], 'user');
     }
 } else {
-    if ($course_info['unsubscribe'] == 1) {
+    if (1 == $course_info['unsubscribe']) {
         $table->set_header($header_nr++, get_lang('Action'), false);
         $table->set_column_filter($header_nr - 1, 'modify_filter');
     }
 }
 
 /*	Header */
-if (isset($origin) && $origin === 'learnpath') {
+if (isset($origin) && 'learnpath' === $origin) {
     Display::display_reduced_header();
 } else {
     if (isset($_GET['keyword']) && !empty($_GET['keyword'])) {
@@ -619,7 +617,7 @@ if ($canRead) {
     echo '</div>';
 
     $allowTutors = api_get_setting('allow_tutors_to_assign_students_to_session');
-    if (api_is_allowed_to_edit() && $allowTutors === 'true') {
+    if (api_is_allowed_to_edit() && 'true' === $allowTutors) {
         $actions .= ' <a class="btn btn-default" href="session_list.php?'.api_get_cidreq().'">'.
             get_lang('Course sessions').'</a>';
     }
@@ -634,7 +632,7 @@ if (!empty($_GET['keyword']) && !empty($_GET['submit'])) {
     echo '<br/>'.get_lang('Search resultsFor').' <span style="font-style: italic ;"> '.$keyword_name.' </span><br>';
 }
 
-if (!isset($origin) || $origin != 'learnpath') {
+if (!isset($origin) || 'learnpath' != $origin) {
     Display::display_footer();
 }
 
@@ -653,7 +651,7 @@ function get_number_of_users()
     if (empty($sessionId)) {
         $status = $type;
     } else {
-        if ($type == COURSEMANAGER) {
+        if (COURSEMANAGER == $type) {
             $status = 2;
         } else {
             $status = 0;
@@ -722,10 +720,10 @@ function get_number_of_users()
  */
 function searchUserKeyword($firstname, $lastname, $username, $official_code, $keyword)
 {
-    if (api_strripos($firstname, $keyword) !== false ||
-        api_strripos($lastname, $keyword) !== false ||
-        api_strripos($username, $keyword) !== false ||
-        api_strripos($official_code, $keyword) !== false
+    if (false !== api_strripos($firstname, $keyword) ||
+        false !== api_strripos($lastname, $keyword) ||
+        false !== api_strripos($username, $keyword) ||
+        false !== api_strripos($official_code, $keyword)
     ) {
         return true;
     } else {
@@ -800,7 +798,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
     if (empty($sessionId)) {
         $status = $type;
     } else {
-        if ($type == COURSEMANAGER) {
+        if (COURSEMANAGER == $type) {
             $status = 2;
         } else {
             $status = 0;
@@ -863,11 +861,11 @@ function get_user_data($from, $number_of_items, $column, $direction)
 
                 // Status
                 $default_status = get_lang('Learner');
-                if ((isset($o_course_user['status_rel']) && $o_course_user['status_rel'] == 1) ||
-                    (isset($o_course_user['status_session']) && $o_course_user['status_session'] == 2)
+                if ((isset($o_course_user['status_rel']) && 1 == $o_course_user['status_rel']) ||
+                    (isset($o_course_user['status_session']) && 2 == $o_course_user['status_session'])
                 ) {
                     $default_status = get_lang('Teacher');
-                } elseif (isset($o_course_user['is_tutor']) && $o_course_user['is_tutor'] == 1) {
+                } elseif (isset($o_course_user['is_tutor']) && 1 == $o_course_user['is_tutor']) {
                     $default_status = get_lang('Coach');
                 }
 
@@ -924,7 +922,7 @@ function get_user_data($from, $number_of_items, $column, $direction)
                 // Group.
                 $temp[] = implode(', ', $groupsNameListParsed);
 
-                if ($course_info['unsubscribe'] == 1) {
+                if (1 == $course_info['unsubscribe']) {
                     //User id for actions
                     $temp[] = $user_id;
                 }
@@ -952,11 +950,11 @@ function active_filter($active, $urlParams, $row)
     $userId = api_get_user_id();
     $action = '';
     $image = '';
-    if ($active == '1') {
+    if ('1' == $active) {
         $action = 'Accountactive';
         $image = 'accept';
     }
-    if ($active == '0') {
+    if ('0' == $active) {
         $action = 'AccountInactive';
         $image = 'error';
     }
@@ -981,13 +979,13 @@ function active_filter($active, $urlParams, $row)
 function modify_filter($user_id, $row, $data)
 {
     global $charset;
-    $canEditUsers = api_get_setting('allow_user_course_subscription_by_course_admin') == 'true' || api_is_platform_admin();
+    $canEditUsers = 'true' == api_get_setting('allow_user_course_subscription_by_course_admin') || api_is_platform_admin();
 
     $is_allowed_to_track = api_is_allowed_to_edit(true, true);
 
     $user_id = $data[0];
     $userInfo = api_get_user_info($user_id);
-    $isInvitee = $userInfo['status'] == INVITEE ? true : false;
+    $isInvitee = INVITEE == $userInfo['status'] ? true : false;
     $course_info = $_course = api_get_course_info();
     $current_user_id = api_get_user_id();
     $sessionId = api_get_session_id();
@@ -1031,7 +1029,7 @@ function modify_filter($user_id, $row, $data)
                     '</a>&nbsp;';
             }
 
-            if ($data['user_status_in_course'] == STUDENT) {
+            if (STUDENT == $data['user_status_in_course']) {
                 $result .= Display::url(
                     $text,
                     'user.php?'.api_get_cidreq().'&action=set_tutor&is_tutor='.$isTutor.'&user_id='.$user_id.'&type='.$type,
@@ -1050,7 +1048,7 @@ function modify_filter($user_id, $row, $data)
         }
     } else {
         // Show buttons for unsubscribe
-        if ($course_info['unsubscribe'] == 1) {
+        if (1 == $course_info['unsubscribe']) {
             if ($user_id == $current_user_id) {
                 $result .= '<a class="btn btn-sm btn-danger delete-swal" href="'.api_get_self().'?'.api_get_cidreq().'&type='.$type.'&unregister=yes&user_id='.$user_id.'" title="'.addslashes(api_htmlentities(get_lang('Unsubscribe'))).' >'.
                     get_lang('Unsubscribe').'</a>&nbsp;';
diff --git a/public/main/user/user_export.php b/public/main/user/user_export.php
index 36442c00dc..d804a8b9a4 100644
--- a/public/main/user/user_export.php
+++ b/public/main/user/user_export.php
@@ -51,7 +51,7 @@ $sql = "SELECT
             u.firstname 	AS FirstName,
             u.email 		AS Email,
             u.username	AS UserName,
-            ".(($_configuration['password_encryption'] != 'none') ? " " : "u.password AS Password, ")."
+            ".(('none' != $_configuration['password_encryption']) ? " " : "u.password AS Password, ")."
             u.auth_source	AS AuthSource,
             u.status		AS Status,
             u.official_code	AS OfficialCode,
@@ -84,7 +84,7 @@ if (strlen($course_code) > 0) {
     if (api_is_multiple_url_enabled()) {
         $tbl_user_rel_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
         $access_url_id = api_get_current_access_url_id();
-        if ($access_url_id != -1) {
+        if (-1 != $access_url_id) {
             $sql .= " FROM $user_table u
 					INNER JOIN $tbl_user_rel_access_url as user_rel_url
 				ON (u.user_id= user_rel_url.user_id)
@@ -98,8 +98,8 @@ if (strlen($course_code) > 0) {
 }
 $data = [];
 $extra_fields = UserManager::get_extra_fields(0, 0, 5, 'ASC', false);
-if ($export['addcsvheader'] == '1' && $export['file_type'] == 'csv') {
-    if ($_configuration['password_encryption'] != 'none') {
+if ('1' == $export['addcsvheader'] && 'csv' == $export['file_type']) {
+    if ('none' != $_configuration['password_encryption']) {
         $data[] = [
             'UserId',
             'LastName',
diff --git a/public/main/user/user_import.php b/public/main/user/user_import.php
index 3bc415e741..dd67b5872e 100644
--- a/public/main/user/user_import.php
+++ b/public/main/user/user_import.php
@@ -7,7 +7,7 @@ $this_section = SECTION_COURSES;
 // notice for unauthorized people.
 api_protect_course_script(true);
 
-if (api_get_setting('allow_user_course_subscription_by_course_admin') == 'false') {
+if ('false' == api_get_setting('allow_user_course_subscription_by_course_admin')) {
     if (!api_is_platform_admin()) {
         api_not_allowed(true);
     }
@@ -15,7 +15,7 @@ if (api_get_setting('allow_user_course_subscription_by_course_admin') == 'false'
 
 // Make sure we know if we're importing students or teachers into the course
 $userType = STUDENT;
-if (!empty($_REQUEST['type']) && $_REQUEST['type'] == COURSEMANAGER) {
+if (!empty($_REQUEST['type']) && COURSEMANAGER == $_REQUEST['type']) {
     $userType = COURSEMANAGER;
 }
 
@@ -43,7 +43,7 @@ $user_to_show = [];
 $type = '';
 
 if ($form->validate()) {
-    if (isset($_FILES['import_file']['size']) && $_FILES['import_file']['size'] !== 0) {
+    if (isset($_FILES['import_file']['size']) && 0 !== $_FILES['import_file']['size']) {
         $unsubscribe_users = isset($_POST['unsubscribe_users']) ? true : false;
         //@todo : csvToArray deprecated
         $users = Import::csvToArray($_FILES['import_file']['tmp_name']);
@@ -88,7 +88,7 @@ if ($form->validate()) {
                     if (!empty($current_user_list)) {
                         $user_ids = [];
                         foreach ($current_user_list as $user) {
-                            if ($userType == COURSEMANAGER) {
+                            if (COURSEMANAGER == $userType) {
                                 if (CourseManager::is_course_teacher($user['user_id'], $course_code)) {
                                     $user_ids[] = $user['user_id'];
                                 }
@@ -140,13 +140,13 @@ if (!empty($message)) {
             $user = array_filter($user);
             $userMessage .= implode(', ', $user)."<br />";
         }
-        if ($type == 'confirmation') {
+        if ('confirmation' == $type) {
             echo Display::return_message($message.': <br />'.$userMessage, 'confirm', false);
         } else {
             echo Display::return_message($message.':  <br />'.$userMessage, 'warning', false);
         }
     } else {
-        $empty_line_msg = ($empty_line == 0) ? get_lang('Errors when importing file') : get_lang('Errors when importing file').': '.get_lang('There are empty lines in the header of selected file');
+        $empty_line_msg = (0 == $empty_line) ? get_lang('Errors when importing file') : get_lang('Errors when importing file').': '.get_lang('There are empty lines in the header of selected file');
         echo Display::return_message($empty_line_msg, 'error');
     }
 }
diff --git a/public/main/webservices/access_url.php b/public/main/webservices/access_url.php
index a40b11ba4d..44e9ec765c 100644
--- a/public/main/webservices/access_url.php
+++ b/public/main/webservices/access_url.php
@@ -479,7 +479,7 @@ $HTTP_RAW_POST_DATA = isset($HTTP_RAW_POST_DATA) ? $HTTP_RAW_POST_DATA : '';
 
 // If you send your data in utf8 then this value must be false.
 $decodeUTF8 = api_get_setting('registration.soap.php.decode_utf8');
-if ($decodeUTF8 === 'true') {
+if ('true' === $decodeUTF8) {
     $server->decode_utf8 = true;
 } else {
     $server->decode_utf8 = false;
diff --git a/public/main/webservices/additional_webservices.php b/public/main/webservices/additional_webservices.php
index 73ebb32eab..ed59468e4a 100644
--- a/public/main/webservices/additional_webservices.php
+++ b/public/main/webservices/additional_webservices.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 /**
- * @package chamilo.webservices
- *
  * @author Francis Gonzales
  */
 require_once __DIR__.'/../inc/global.inc.php';
@@ -62,7 +60,7 @@ function wsConvertPpt($pptData)
     $shell = exec($cmd, $files, $return);
     umask($oldumask);
 
-    if ($return === 0) {
+    if (0 === $return) {
         $images = [];
         if (is_array($files) && !empty($files)) {
             foreach ($files as $file) {
diff --git a/public/main/webservices/api/v2.php b/public/main/webservices/api/v2.php
index 2850e44f39..b6e228157f 100644
--- a/public/main/webservices/api/v2.php
+++ b/public/main/webservices/api/v2.php
@@ -70,7 +70,7 @@ try {
                 throw new Exception(get_lang('No data available'));
             }
 
-            $messageStatus = $action === Rest::POST_USER_MESSAGE_READ ? MESSAGE_STATUS_NEW : MESSAGE_STATUS_UNREAD;
+            $messageStatus = Rest::POST_USER_MESSAGE_READ === $action ? MESSAGE_STATUS_NEW : MESSAGE_STATUS_UNREAD;
 
             $data = array_flip($messagesId);
 
diff --git a/public/main/webservices/client_soap.php b/public/main/webservices/client_soap.php
index 2c5825a579..896597e327 100644
--- a/public/main/webservices/client_soap.php
+++ b/public/main/webservices/client_soap.php
@@ -256,7 +256,7 @@ if (!empty($user_id) && is_numeric($user_id)) {
         echo 'Course TEST does not exists please create one course with code "TEST"';
     }
 
-    if ($result == 1) {
+    if (1 == $result) {
         echo "User $user_id was added to course TEST";
     } else {
         echo $result;
diff --git a/public/main/webservices/cm_soap.php b/public/main/webservices/cm_soap.php
index b27aa23021..7fd88d1929 100644
--- a/public/main/webservices/cm_soap.php
+++ b/public/main/webservices/cm_soap.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.webservices
- */
+
 require_once __DIR__.'/../inc/global.inc.php';
 require_once __DIR__.'/cm_webservice.php';
 
diff --git a/public/main/webservices/cm_soap_announcements.php b/public/main/webservices/cm_soap_announcements.php
index 3a11fc1f31..13efcd19d3 100644
--- a/public/main/webservices/cm_soap_announcements.php
+++ b/public/main/webservices/cm_soap_announcements.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/cm_webservice_announcements.php';
 require_once __DIR__.'/cm_soap.php';
 
diff --git a/public/main/webservices/cm_soap_course.php b/public/main/webservices/cm_soap_course.php
index d815a8099a..6b86473233 100644
--- a/public/main/webservices/cm_soap_course.php
+++ b/public/main/webservices/cm_soap_course.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/cm_webservice_course.php';
 require_once __DIR__.'/cm_soap.php';
 
diff --git a/public/main/webservices/cm_soap_courses.php b/public/main/webservices/cm_soap_courses.php
index 031de912d4..394ba85f6e 100644
--- a/public/main/webservices/cm_soap_courses.php
+++ b/public/main/webservices/cm_soap_courses.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/cm_webservice_courses.php';
 require_once __DIR__.'/cm_soap.php';
 
diff --git a/public/main/webservices/cm_soap_forum.php b/public/main/webservices/cm_soap_forum.php
index d9f46a06ef..421f0d53b4 100644
--- a/public/main/webservices/cm_soap_forum.php
+++ b/public/main/webservices/cm_soap_forum.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/cm_webservice_forum.php';
 require_once __DIR__.'/cm_soap.php';
 
diff --git a/public/main/webservices/cm_soap_inbox.php b/public/main/webservices/cm_soap_inbox.php
index b069ee5751..06d65c9769 100644
--- a/public/main/webservices/cm_soap_inbox.php
+++ b/public/main/webservices/cm_soap_inbox.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/cm_webservice_inbox.php';
 require_once __DIR__.'/cm_soap.php';
 
diff --git a/public/main/webservices/cm_soap_user.php b/public/main/webservices/cm_soap_user.php
index ff18f95ee1..5cecfe7419 100644
--- a/public/main/webservices/cm_soap_user.php
+++ b/public/main/webservices/cm_soap_user.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/cm_webservice_user.php';
 require_once __DIR__.'/cm_soap.php';
 
diff --git a/public/main/webservices/cm_webservice.php b/public/main/webservices/cm_webservice.php
index 53cf210bd4..e5a212014d 100644
--- a/public/main/webservices/cm_webservice.php
+++ b/public/main/webservices/cm_webservice.php
@@ -3,9 +3,6 @@
 
 use Chamilo\UserBundle\Entity\User;
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/../inc/global.inc.php';
 
 /**
@@ -131,7 +128,7 @@ class WSCM
         ]);
 
         if ($uData) {
-            if ($uData->getAuthSource() == PLATFORM_AUTH_SOURCE) {
+            if (PLATFORM_AUTH_SOURCE == $uData->getAuthSource()) {
                 $passwordEncoded = UserManager::encryptPassword($password, $uData);
                 // Check the user's password
                 if ($passwordEncoded == $uData->getPassword() && (trim($login) == $uData->getUsername())) {
@@ -217,7 +214,7 @@ class WSCM
      */
     protected function getUserId($user_id_field_name, $user_id_value)
     {
-        if ($user_id_field_name == "chamilo_user_id") {
+        if ("chamilo_user_id" == $user_id_field_name) {
             if (UserManager::is_user_id_valid(intval($user_id_value))) {
                 return intval($user_id_value);
             } else {
@@ -228,7 +225,7 @@ class WSCM
                 $user_id_value,
                 $user_id_field_name
             );
-            if ($user_id == 0) {
+            if (0 == $user_id) {
                 return new WSCMError(100, "User not found");
             } else {
                 return $user_id;
@@ -248,8 +245,8 @@ class WSCM
      */
     protected function getCourseId($course_id_field_name, $course_id_value)
     {
-        if ($course_id_field_name == "chamilo_course_id") {
-            if (CourseManager::get_course_code_from_course_id($course_id_value) != null) {
+        if ("chamilo_course_id" == $course_id_field_name) {
+            if (null != CourseManager::get_course_code_from_course_id($course_id_value)) {
                 return intval($course_id_value);
             } else {
                 return new WSCMError(200, "Course not found");
@@ -279,7 +276,7 @@ class WSCM
      */
     protected function getSessionId($session_id_field_name, $session_id_value)
     {
-        if ($session_id_field_name == "chamilo_session_id") {
+        if ("chamilo_session_id" == $session_id_field_name) {
             $session = SessionManager::fetch((int) $session_id_value);
             if (!empty($session)) {
                 return intval($session_id_value);
@@ -291,7 +288,7 @@ class WSCM
                 $session_id_value,
                 $session_id_field_name
             );
-            if ($session_id == 0) {
+            if (0 == $session_id) {
                 return new WSCMError(300, "Session not found");
             } else {
                 return $session_id;
diff --git a/public/main/webservices/cm_webservice_announcements.php b/public/main/webservices/cm_webservice_announcements.php
index ccd090c08b..9163047238 100644
--- a/public/main/webservices/cm_webservice_announcements.php
+++ b/public/main/webservices/cm_webservice_announcements.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/../inc/global.inc.php';
 require_once __DIR__.'/cm_webservice.php';
 
@@ -16,7 +13,7 @@ class WSCMAnnouncements extends WSCM
 {
     public function get_announcements_id($username, $password, $course_code)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $result = self::get_announcements($username, $course_code);
 
             $announcements = "#";
@@ -37,7 +34,7 @@ class WSCMAnnouncements extends WSCM
         $announcement_id,
         $field
     ) {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $htmlcode = false;
             $user_id = UserManager::get_user_id_from_username($username);
 
@@ -92,7 +89,7 @@ class WSCMAnnouncements extends WSCM
         $session_id = api_get_session_id();
         $condition_session = api_get_session_condition($session_id);
 
-        $announcement_id = ($announcement_id == 0) ? "" : "AND announcement.id=".$announcement_id;
+        $announcement_id = (0 == $announcement_id) ? "" : "AND announcement.id=".$announcement_id;
         $user_id = UserManager::get_user_id_from_username($username);
         $course_info = CourseManager::get_course_information($course_code);
         $tbl_item_property = Database::get_course_table(TABLE_ITEM_PROPERTY);
@@ -104,7 +101,7 @@ class WSCMAnnouncements extends WSCM
             $user_id
         );
 
-        if (api_get_group_id() == 0) {
+        if (0 == api_get_group_id()) {
             $cond_user_id = " AND (
                 ip.to_user_id='".$user_id."' OR
                 ip.to_group_id IN (0, ".implode(", ", $group_memberships).") OR
diff --git a/public/main/webservices/cm_webservice_course.php b/public/main/webservices/cm_webservice_course.php
index e3775f2bac..39b2e2a103 100644
--- a/public/main/webservices/cm_webservice_course.php
+++ b/public/main/webservices/cm_webservice_course.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/../inc/global.inc.php';
 require_once __DIR__.'/cm_webservice.php';
 
@@ -449,7 +446,7 @@ class WSCMCourse extends WSCM
 
     public function unreadMessage($username, $password)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $table_message = Database::get_main_table(TABLE_MESSAGE);
             $user_id = UserManager::get_user_id_from_username($username);
             $condition_msg_status = ' msg_status = 1 '; // define('MESSAGE_STATUS_UNREAD', '1');
@@ -469,14 +466,14 @@ class WSCMCourse extends WSCM
 
     public function get_message_data($username, $password)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $user_id = get_user_id_from_username($username);
         }
     }
 
     public function nada($username, $password)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             return $username.$password;
         }
 
@@ -541,7 +538,7 @@ class WSCMCourse extends WSCM
     ) {
         // Add the original course id field name and value to the extra fields if needed
         $extras_associative = [];
-        if ($course_id_field_name != "chamilo_course_id") {
+        if ("chamilo_course_id" != $course_id_field_name) {
             $extras_associative[$course_id_field_name] = $course_id_value;
         }
         foreach ($extras as $extra) {
@@ -551,7 +548,7 @@ class WSCMCourse extends WSCM
         if ($course_admin_id instanceof WSError) {
             return $course_admin_id;
         }
-        if ($wanted_code == '') {
+        if ('' == $wanted_code) {
             $wanted_code = CourseManager::generate_course_code($title);
         }
         $result = create_course(
@@ -630,13 +627,13 @@ class WSCMCourse extends WSCM
             if (!empty($language)) {
                 $attributes['course_language'] = $language;
             }
-            if ($visibility != '') {
+            if ('' != $visibility) {
                 $attributes['visibility'] = (int) $visibility;
             }
-            if ($subscribe != '') {
+            if ('' != $subscribe) {
                 $attributes['subscribe'] = (int) $subscribe;
             }
-            if ($unsubscribe != '') {
+            if ('' != $unsubscribe) {
                 $attributes['unsubscribe'] = (int) $unsubscribe;
             }
             if (!empty($visual_code)) {
@@ -689,7 +686,7 @@ class WSCMCourse extends WSCM
                 return $user_id;
             } else {
                 $course_code = CourseManager::get_course_code_from_course_id($course_id);
-                if ($state == 0) {
+                if (0 == $state) {
                     // Unsubscribe user
                     CourseManager::unsubscribe_user($user_id, $course_code);
 
diff --git a/public/main/webservices/cm_webservice_courses.php b/public/main/webservices/cm_webservice_courses.php
index ab81aa6b2e..8dc8729f97 100644
--- a/public/main/webservices/cm_webservice_courses.php
+++ b/public/main/webservices/cm_webservice_courses.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/../inc/global.inc.php';
 require_once __DIR__.'/cm_webservice.php';
 
@@ -16,7 +13,7 @@ class WSCMCourses extends WSCM
 {
     public function get_courses_code($username, $password)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $user_id = UserManager::get_user_id_from_username($username);
             $listOfCourses = UserManager::get_personal_session_course_list($user_id);
 
@@ -33,7 +30,7 @@ class WSCMCourses extends WSCM
 
     public function get_course_title($username, $password, $course_code)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $course_info = CourseManager::get_course_information($course_code);
 
             return $course_info['title'];
diff --git a/public/main/webservices/cm_webservice_forum.php b/public/main/webservices/cm_webservice_forum.php
index daac7038fb..e6a29ac7aa 100644
--- a/public/main/webservices/cm_webservice_forum.php
+++ b/public/main/webservices/cm_webservice_forum.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.webservices
- */
+
 require_once __DIR__.'/../inc/global.inc.php';
 require_once __DIR__.'/../forum/forumfunction.inc.php';
 require_once __DIR__.'/cm_webservice.php';
@@ -16,7 +14,7 @@ class WSCMForum extends WSCM
 {
     public function get_foruns_id($username, $password, $course_code)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $course_db = api_get_course_info($course_code);
             $foruns_info = get_forums($id = '', $course_db['code']);
             $foruns_id = '#';
@@ -38,7 +36,7 @@ class WSCMForum extends WSCM
         $course_code,
         $forum_id
     ) {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $course_db = api_get_course_info($course_code);
             $table_forums = Database::get_course_table(TABLE_FORUM, $course_db['db_name']);
             $table_item_property = Database::get_course_table(TABLE_ITEM_PROPERTY, $course_db['db_name']);
@@ -65,7 +63,7 @@ class WSCMForum extends WSCM
         $course_code,
         $forum_id
     ) {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $threads_info = get_threads($forum_id);
             $threads_id = '#';
             foreach ($threads_info as $thread) {
@@ -87,7 +85,7 @@ class WSCMForum extends WSCM
         $thread_id,
         $field
     ) {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $course_db = api_get_course_info($course_code);
             $table_item_property = Database::get_course_table(TABLE_ITEM_PROPERTY, $course_db['db_name']);
             $table_threads = Database::get_course_table(TABLE_FORUM_THREAD, $course_db['db_name']);
@@ -132,7 +130,7 @@ class WSCMForum extends WSCM
         $course_code,
         $thread_id
     ) {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $course_db = api_get_course_info($course_code);
             $table_item_property = Database::get_course_table(TABLE_ITEM_PROPERTY, $course_db['db_name']);
             $table_threads = Database::get_course_table(TABLE_FORUM_THREAD, $course_db['db_name']);
@@ -155,7 +153,7 @@ class WSCMForum extends WSCM
 
     public function get_posts_id($username, $password, $course_code, $thread_id)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $course_db = api_get_course_info($course_code);
 
             $table_users = Database::get_main_table(TABLE_MAIN_USER);
@@ -203,7 +201,7 @@ class WSCMForum extends WSCM
         $post_id,
         $field
     ) {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $table_posts = Database::get_course_table(TABLE_FORUM_POST);
             $table_users = Database::get_main_table(TABLE_MAIN_USER);
 
@@ -251,7 +249,7 @@ class WSCMForum extends WSCM
         $title,
         $content
     ) {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $em = Database::getManager();
             $course_db = api_get_course_info($course_code);
 
diff --git a/public/main/webservices/cm_webservice_inbox.php b/public/main/webservices/cm_webservice_inbox.php
index 597f6e5c0b..1b52150bac 100644
--- a/public/main/webservices/cm_webservice_inbox.php
+++ b/public/main/webservices/cm_webservice_inbox.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.webservices
- */
+
 require_once __DIR__.'/../inc/global.inc.php';
 require_once __DIR__.'/cm_webservice.php';
 
@@ -15,7 +13,7 @@ class WSCMInbox extends WSCM
 {
     public function unreadMessage($username, $password)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $table_message = Database::get_main_table(TABLE_MESSAGE);
             $user_id = UserManager::get_user_id_from_username($username);
             $condition_msg_status = ' msg_status = 1 '; // define('MESSAGE_STATUS_UNREAD', '1');
@@ -39,7 +37,7 @@ class WSCMInbox extends WSCM
         $from,
         $number_of_items
     ) {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $user_id = UserManager::get_user_id_from_username($username);
             $table_message = Database::get_main_table(TABLE_MESSAGE);
 
@@ -61,7 +59,7 @@ class WSCMInbox extends WSCM
 
     public function get_message_data($username, $password, $message_id, $field)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $htmlcode = false;
             $user_id = UserManager::get_user_id_from_username($username);
             switch ($field) {
@@ -107,7 +105,7 @@ class WSCMInbox extends WSCM
         $from,
         $number_of_items
     ) {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $user_id = UserManager::get_user_id_from_username($username);
 
             $table_message = Database::get_main_table(TABLE_MESSAGE);
@@ -129,7 +127,7 @@ class WSCMInbox extends WSCM
 
     public function get_message_data_sent($username, $password, $id, $field)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $htmlcode = false;
             switch ($field) {
                 case 'sender':
@@ -173,7 +171,7 @@ class WSCMInbox extends WSCM
         $content
     ) {
         //TODO: verificar data de envio. Esta divergindo de data!
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $group_id = intval(0);
             $parent_id = intval(0);
             $edit_message_id = intval(0);
diff --git a/public/main/webservices/cm_webservice_user.php b/public/main/webservices/cm_webservice_user.php
index b0f1eba836..d455b37b90 100644
--- a/public/main/webservices/cm_webservice_user.php
+++ b/public/main/webservices/cm_webservice_user.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.webservices
- */
+
 require_once __DIR__.'/../inc/global.inc.php';
 require_once __DIR__.'/cm_webservice.php';
 
@@ -15,7 +13,7 @@ class WSCMUser extends WSCM
 {
     public function find_id_user($username, $password, $name)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $listResult = "#";
 
             $listArrayResult = [];
@@ -58,7 +56,7 @@ class WSCMUser extends WSCM
 
     public function get_link_user_picture($username, $password, $id)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $userPic = UserManager::getUserPicture($id);
             if (empty($userPic)) {
                 return "0";
@@ -72,7 +70,7 @@ class WSCMUser extends WSCM
 
     public function get_user_name($username, $password, $id, $field)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $userInfo = api_get_user_info($id);
             switch ($field) {
                 case 'firstname':
@@ -104,7 +102,7 @@ class WSCMUser extends WSCM
         $content_message = ''
     ) {
         global $charset;
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $user_id = UserManager::get_user_id_from_username($username);
             $message_title = get_lang('Invitation');
             $count_is_true = SocialManager::send_invitation_friend(
@@ -142,7 +140,7 @@ class WSCMUser extends WSCM
 
     public function accept_friend($username, $password, $userfriend_id)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $user_id = UserManager::get_user_id_from_username($username);
             UserManager::relate_users(
                 $userfriend_id,
@@ -159,7 +157,7 @@ class WSCMUser extends WSCM
 
     public function denied_invitation($username, $password, $userfriend_id)
     {
-        if ($this->verifyUserPass($username, $password) == "valid") {
+        if ("valid" == $this->verifyUserPass($username, $password)) {
             $user_id = UserManager::get_user_id_from_username($username);
             SocialManager::invitation_denied($userfriend_id, $user_id);
 
diff --git a/public/main/webservices/courses_list.rest.php b/public/main/webservices/courses_list.rest.php
index 6e25236f87..2951d7bfde 100644
--- a/public/main/webservices/courses_list.rest.php
+++ b/public/main/webservices/courses_list.rest.php
@@ -8,8 +8,6 @@
  * http://drupal.org/project/chamilo.
  *
  * @author Yannick Warnier <yannick.warnier@beeznest.com>
- *
- * @package chamilo.webservices
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/webservices/courses_list.soap.php b/public/main/webservices/courses_list.soap.php
index 94c55e0c1a..37d7d20088 100644
--- a/public/main/webservices/courses_list.soap.php
+++ b/public/main/webservices/courses_list.soap.php
@@ -9,8 +9,6 @@
  * http://drupal.org/project/chamilo.
  *
  * @author Yannick Warnier <yannick.warnier@beeznest.com>
- *
- * @package chamilo.webservices
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
diff --git a/public/main/webservices/example_fill_users_fields.php b/public/main/webservices/example_fill_users_fields.php
index 267d328f87..f5162413a9 100644
--- a/public/main/webservices/example_fill_users_fields.php
+++ b/public/main/webservices/example_fill_users_fields.php
@@ -6,8 +6,6 @@
  * to be the same as in the application which calls the webservice).
  * This script should be called any time a new user (or a large group of new
  * users) is added to the database.
- *
- * @package chamilo.webservices
  */
 //remove the next line to enable the script (this can harm your database so
 // don't enable unless you know what you're doing and you have a backup)
diff --git a/public/main/webservices/gradebook.php b/public/main/webservices/gradebook.php
index 0d09639d90..b16c7799a3 100644
--- a/public/main/webservices/gradebook.php
+++ b/public/main/webservices/gradebook.php
@@ -300,7 +300,7 @@ function WSGetGradebookCategoryUserScore($params)
             $item->set_course_code($courseCode);
             $score = $item->calc_score($userId);
             if (!empty($score)) {
-                $divide = $score[1] == 0 ? 1 : $score[1];
+                $divide = 0 == $score[1] ? 1 : $score[1];
                 $item_value = $score[0] / $divide * $item->get_weight();
                 $item_value_total += $item_value;
             }
@@ -511,7 +511,7 @@ $HTTP_RAW_POST_DATA = isset($HTTP_RAW_POST_DATA) ? $HTTP_RAW_POST_DATA : '';
 
 // If you send your data in utf8 then this value must be false.
 $decodeUTF8 = api_get_setting('registration.soap.php.decode_utf8');
-if ($decodeUTF8 === 'true') {
+if ('true' === $decodeUTF8) {
     $server->decode_utf8 = true;
 } else {
     $server->decode_utf8 = false;
diff --git a/public/main/webservices/http-auth.php b/public/main/webservices/http-auth.php
index 0ce691dbd1..3e54dbf97a 100644
--- a/public/main/webservices/http-auth.php
+++ b/public/main/webservices/http-auth.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.webservices
- */
+
 $realm = 'The batcave';
 
 // Just a random id
@@ -43,10 +41,10 @@ function getDigest()
         $digest = $_SERVER['PHP_AUTH_DIGEST'];
     // most other servers
     } elseif (isset($_SERVER['HTTP_AUTHENTICATION'])) {
-        if (strpos(
+        if (0 === strpos(
                 strtolower($_SERVER['HTTP_AUTHENTICATION']),
                 'digest'
-            ) === 0) {
+            )) {
             $digest = substr($_SERVER['HTTP_AUTHORIZATION'], 7);
         }
     } elseif (isset($_SERVER['HTTP_WWW_AUTHENTICATE'])) {
diff --git a/public/main/webservices/lp.php b/public/main/webservices/lp.php
index 220ead49ac..9fc4035a22 100644
--- a/public/main/webservices/lp.php
+++ b/public/main/webservices/lp.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/../inc/global.inc.php';
 
 ini_set('memory_limit', -1);
diff --git a/public/main/webservices/registration.soap.php b/public/main/webservices/registration.soap.php
index 92f1cc03c7..ef755a262a 100644
--- a/public/main/webservices/registration.soap.php
+++ b/public/main/webservices/registration.soap.php
@@ -6,9 +6,6 @@ use Chamilo\CoreBundle\Framework\Container;
 use Chamilo\CoreBundle\Hook\HookWSRegistration;
 use Chamilo\UserBundle\Entity\User;
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/../inc/global.inc.php';
 $debug = true;
 
@@ -310,7 +307,7 @@ function WSCreateUsers($params)
             /** @var User $user */
             $user = $userRepository->find($user_id);
 
-            if ($user && $user->isActive() == false) {
+            if ($user && false == $user->isActive()) {
                 if (!is_null($password)) {
                     $user->setPlainPassword($password);
                 }
@@ -384,7 +381,7 @@ function WSCreateUsers($params)
 
         if ($userId) {
             if (api_is_multiple_url_enabled()) {
-                if (api_get_current_access_url_id() != -1) {
+                if (-1 != api_get_current_access_url_id()) {
                     UrlManager::add_user_to_url(
                         $userId,
                         api_get_current_access_url_id()
@@ -537,7 +534,7 @@ function WSCreateUser($params)
     if ($user_id > 0) {
         /** @var User $user */
         $user = $userRepository->find($user_id);
-        if ($user && $user->isActive() == false) {
+        if ($user && false == $user->isActive()) {
             if (!is_null($password)) {
                 $user->setPlainPassword($password);
             }
@@ -615,7 +612,7 @@ function WSCreateUser($params)
 
     if ($userId) {
         if (api_is_multiple_url_enabled()) {
-            if (api_get_current_access_url_id() != -1) {
+            if (-1 != api_get_current_access_url_id()) {
                 UrlManager::add_user_to_url($userId, api_get_current_access_url_id());
             } else {
                 UrlManager::add_user_to_url($userId, 1);
@@ -816,11 +813,11 @@ function WSCreateUsersPasswordCrypted($params)
 
         if (!empty($_configuration['password_encryption'])) {
             if ($_configuration['password_encryption'] === $encrypt_method) {
-                if ($encrypt_method == 'md5' && !preg_match('/^[A-Fa-f0-9]{32}$/', $password)) {
+                if ('md5' == $encrypt_method && !preg_match('/^[A-Fa-f0-9]{32}$/', $password)) {
                     $msg = "Encryption $encrypt_method is invalid";
                     $results[] = $msg;
                     continue;
-                } elseif ($encrypt_method == 'sha1' && !preg_match('/^[A-Fa-f0-9]{40}$/', $password)) {
+                } elseif ('sha1' == $encrypt_method && !preg_match('/^[A-Fa-f0-9]{40}$/', $password)) {
                     $msg = "Encryption $encrypt_method is invalid";
                     $results[] = $msg;
                     continue;
@@ -838,7 +835,7 @@ function WSCreateUsersPasswordCrypted($params)
 
         if (is_array($extra_list) && count($extra_list) > 0) {
             foreach ($extra_list as $extra) {
-                if ($extra['field_name'] == 'salt') {
+                if ('salt' == $extra['field_name']) {
                     $salt = $extra['field_value'];
                     break;
                 }
@@ -957,7 +954,7 @@ function WSCreateUsersPasswordCrypted($params)
             Database::query($sql);
 
             if (api_is_multiple_url_enabled()) {
-                if (api_get_current_access_url_id() != -1) {
+                if (-1 != api_get_current_access_url_id()) {
                     UrlManager::add_user_to_url(
                         $return,
                         api_get_current_access_url_id()
@@ -1308,14 +1305,14 @@ function WSCreateUserPasswordCrypted($params)
 
     if (!empty($_configuration['password_encryption'])) {
         if ($_configuration['password_encryption'] === $encrypt_method) {
-            if ($encrypt_method == 'md5' && !preg_match('/^[A-Fa-f0-9]{32}$/', $password)) {
+            if ('md5' == $encrypt_method && !preg_match('/^[A-Fa-f0-9]{32}$/', $password)) {
                 $msg = "Encryption $encrypt_method is invalid";
                 if ($debug) {
                     error_log($msg);
                 }
 
                 return $msg;
-            } elseif ($encrypt_method == 'sha1' && !preg_match('/^[A-Fa-f0-9]{40}$/', $password)) {
+            } elseif ('sha1' == $encrypt_method && !preg_match('/^[A-Fa-f0-9]{40}$/', $password)) {
                 $msg = "Encryption $encrypt_method is invalid";
                 if ($debug) {
                     error_log($msg);
@@ -1638,7 +1635,7 @@ function WSEditUserCredentials($params)
         $original_user_id_name
     );
 
-    if ($user_id == 0) {
+    if (0 == $user_id) {
         return 0;
     } else {
         $sql = "SELECT user_id FROM $table_user
@@ -1764,7 +1761,7 @@ function WSEditUsers($params)
             $original_user_id_name
         );
 
-        if ($user_id == 0) {
+        if (0 == $user_id) {
             $results[] = 0; // Original_user_id_value doesn't exist.
             continue;
         } else {
@@ -1949,7 +1946,7 @@ function WSEditUser($params)
         $original_user_id_name
     );
 
-    if ($user_id == 0) {
+    if (0 == $user_id) {
         return 0;
     } elseif (empty($enable)) {
         $sql = "SELECT user_id FROM $table_user
@@ -2130,7 +2127,7 @@ function WSEditUserWithPicture($params)
         $pictureUri = UserManager::update_user_picture($user_id, $filename, $tempDir.$filename);
     }
 
-    if ($user_id == 0) {
+    if (0 == $user_id) {
         return 0;
     } else {
         $sql = "SELECT id FROM $table_user WHERE id =$user_id AND active= 0";
@@ -2340,11 +2337,11 @@ function WSEditUsersPasswordCrypted($params)
             $password = $user_param['password'];
             $encrypt_method = $user_param['encrypt_method'];
             if ($_configuration['password_encryption'] === $encrypt_method) {
-                if ($encrypt_method == 'md5' && !preg_match('/^[A-Fa-f0-9]{32}$/', $password)) {
+                if ('md5' == $encrypt_method && !preg_match('/^[A-Fa-f0-9]{32}$/', $password)) {
                     $msg = "Encryption $encrypt_method is invalid";
                     $results[] = $msg;
                     continue;
-                } elseif ($encrypt_method == 'sha1' && !preg_match('/^[A-Fa-f0-9]{40}$/', $password)) {
+                } elseif ('sha1' == $encrypt_method && !preg_match('/^[A-Fa-f0-9]{40}$/', $password)) {
                     $msg = "Encryption $encrypt_method is invalid";
                     $results[] = $msg;
                     continue;
@@ -2369,7 +2366,7 @@ function WSEditUsersPasswordCrypted($params)
             $original_user_id_name
         );
 
-        if ($user_id == 0) {
+        if (0 == $user_id) {
             $results[] = 0; // Original_user_id_value doesn't exist.
             continue;
         } else {
@@ -2545,11 +2542,11 @@ function WSEditUserPasswordCrypted($params)
         $password = $params['password'];
         $encrypt_method = $params['encrypt_method'];
         if ($_configuration['password_encryption'] === $encrypt_method) {
-            if ($encrypt_method == 'md5' && !preg_match('/^[A-Fa-f0-9]{32}$/', $password)) {
+            if ('md5' == $encrypt_method && !preg_match('/^[A-Fa-f0-9]{32}$/', $password)) {
                 $msg = "Encryption $encrypt_method is invalid";
 
                 return $msg;
-            } elseif ($encrypt_method == 'sha1' && !preg_match('/^[A-Fa-f0-9]{40}$/', $password)) {
+            } elseif ('sha1' == $encrypt_method && !preg_match('/^[A-Fa-f0-9]{40}$/', $password)) {
                 $msg = "Encryption $encrypt_method is invalid";
 
                 return $msg;
@@ -2578,7 +2575,7 @@ function WSEditUserPasswordCrypted($params)
         error_log("user: $user_id");
     }
 
-    if ($user_id == 0) {
+    if (0 == $user_id) {
         return 0;
     } else {
         $sql = "SELECT user_id FROM $table_user
@@ -2763,11 +2760,11 @@ function WSHelperActionOnUsers($params, $type)
             if ($debug) {
                 error_log("User found: $user_id");
             }
-            if ($type == 'delete') {
+            if ('delete' == $type) {
                 $result = UserManager::delete_user($user_id);
-            } elseif ($type == "disable") {
+            } elseif ("disable" == $type) {
                 $result = UserManager::disable($user_id);
-            } elseif ($type == "enable") {
+            } elseif ("enable" == $type) {
                 $result = UserManager::enable($user_id);
             }
         } else {
@@ -2986,14 +2983,14 @@ function WSCreateCourse($params)
         );
 
         if (!empty($courseInfo)) {
-            if ($courseInfo['visibility'] != 0) {
+            if (0 != $courseInfo['visibility']) {
                 $sql = "UPDATE $table_course SET
                             course_language='".Database::escape_string($course_language)."',
                             title='".Database::escape_string($title)."',
                             category_code='".Database::escape_string($category_code)."',
                             tutor_name='".Database::escape_string($tutor_name)."',
                             visual_code='".Database::escape_string($wanted_code)."'";
-                if ($visibility !== null) {
+                if (null !== $visibility) {
                     $sql .= ", visibility = '$visibility' ";
                 }
                 $sql .= " WHERE id='".$courseInfo['real_id']."'";
@@ -3033,10 +3030,10 @@ function WSCreateCourse($params)
         $params['visibility'] = $visibility;
         $params['disk_quota'] = $diskQuota;
 
-        if (isset($subscribe) && $subscribe != '') { // Valid values: 0, 1
+        if (isset($subscribe) && '' != $subscribe) { // Valid values: 0, 1
             $params['subscribe'] = $subscribe;
         }
-        if (isset($unsubscribe) && $subscribe != '') { // Valid values: 0, 1
+        if (isset($unsubscribe) && '' != $subscribe) { // Valid values: 0, 1
             $params['unsubscribe'] = $unsubscribe;
         }
 
@@ -3219,7 +3216,7 @@ function WSCreateCourseByTitle($params)
         );
 
         if (!empty($courseInfo)) {
-            if ($courseInfo['visibility'] != 0) {
+            if (0 != $courseInfo['visibility']) {
                 $sql = "UPDATE $table_course SET
                             course_language='".Database::escape_string($course_language)."',
                             title='".Database::escape_string($title)."',
@@ -3579,7 +3576,7 @@ function WSCourseDescription($params)
         $original_course_id_name
     );
 
-    if (empty($courseInfo) || (isset($courseInfo) && $courseInfo['visibility'] == 0)) {
+    if (empty($courseInfo) || (isset($courseInfo) && 0 == $courseInfo['visibility'])) {
         return 0; // Original_course_id_value doesn't exist.
     }
 
@@ -3732,7 +3729,7 @@ function WSEditCourseDescription($params)
             $original_course_id_name
         );
 
-        if (empty($courseInfo) || (isset($courseInfo) && $courseInfo['visibility'] == 0)) {
+        if (empty($courseInfo) || (isset($courseInfo) && 0 == $courseInfo['visibility'])) {
             $results[] = 0;
             continue; // Original_course_id_value doesn't exist.
         }
@@ -3880,7 +3877,7 @@ function WSDeleteCourse($params)
             $original_course_id_name
         );
 
-        if (empty($courseInfo) || (isset($courseInfo) && $courseInfo['visibility'] == 0)) {
+        if (empty($courseInfo) || (isset($courseInfo) && 0 == $courseInfo['visibility'])) {
             $results[] = 0;
             continue; // Original_course_id_value doesn't exist.
         }
@@ -4634,7 +4631,7 @@ function WSSubscribeUserToCourse($params)
             error_log('WSSubscribeUserToCourse user_id: '.$user_id);
         }
 
-        if ($user_id == 0) {
+        if (0 == $user_id) {
             // If user was not found, there was a problem
             $resultValue = 0;
         } else {
@@ -5143,7 +5140,7 @@ function WSUnsubscribeUserFromCourse($params)
                 $original_user_id_values[$key],
                 $original_user_id_name[$key]
             );
-            if ($user_id == 0) {
+            if (0 == $user_id) {
                 continue; // user_id doesn't exist.
             } else {
                 $sql = "SELECT user_id FROM $user_table WHERE user_id ='".$user_id."' AND active= '0'";
@@ -5164,7 +5161,7 @@ function WSUnsubscribeUserFromCourse($params)
         );
 
         if (empty($courseInfo) ||
-            (isset($courseInfo) && $courseInfo['visibility'] == 0)
+            (isset($courseInfo) && 0 == $courseInfo['visibility'])
         ) {
             $results[] = 0;
             continue; // Original_course_id_value doesn't exist.
@@ -5172,7 +5169,7 @@ function WSUnsubscribeUserFromCourse($params)
 
         $courseId = $courseInfo['real_id'];
 
-        if (count($usersList) == 0) {
+        if (0 == count($usersList)) {
             $results[] = 0;
             continue;
         }
@@ -5474,7 +5471,7 @@ function WSSuscribeUsersToSession($params)
                 error_log("User to subscribe: $user_id");
             }
 
-            if ($user_id == 0) {
+            if (0 == $user_id) {
                 $results[] = 0;
                 continue; // user_id doesn't exist.
             } else {
@@ -5721,7 +5718,7 @@ function WSUnsuscribeUsersFromSession($params)
                 $original_user_id_name
             );
 
-            if ($user_id == 0) {
+            if (0 == $user_id) {
                 $results[] = 0;
                 continue; // user_id doesn't exist.
             } else {
@@ -5926,7 +5923,7 @@ function WSSuscribeCoursesToSession($params)
             );
 
             if (empty($courseInfo) ||
-                (isset($courseInfo) && $courseInfo['visibility'] == 0)
+                (isset($courseInfo) && 0 == $courseInfo['visibility'])
             ) {
                 $results[] = 0;
                 continue; // Original_course_id_value doesn't exist.
@@ -6083,7 +6080,7 @@ function WSUnsuscribeCoursesFromSession($params)
             );
 
             if (empty($courseInfo) || isset($courseInfo) &&
-                $courseInfo['visibility'] == 0
+                0 == $courseInfo['visibility']
             ) {
                 continue; // Course_code doesn't exist'
             }
@@ -6689,7 +6686,7 @@ function WSFetchSession($params)
 
     $sessionData = SessionManager::fetch($params['id']);
 
-    if ($sessionData === false) {
+    if (false === $sessionData) {
         return returnError(WS_ERROR_INVALID_INPUT);
     }
 
@@ -6752,7 +6749,7 @@ $server->register(
 function WSCertificatesList($startingDate = '', $endingDate = '')
 {
     $certificatesCron = api_get_setting('add_gradebook_certificates_cron_task_enabled');
-    if ($certificatesCron === 'true') {
+    if ('true' === $certificatesCron) {
         require_once api_get_path(SYS_CODE_PATH).'cron/add_gradebook_certificates.php';
     }
     $result = [];
@@ -7257,7 +7254,7 @@ function WSAddUserVisibilityToCourseInCatalogue($params)
             error_log('WSAddUserVisibilityToCourseCatalogue userId: '.$userId);
         }
 
-        if ($userId == 0) {
+        if (0 == $userId) {
             // If user was not found, there was a problem
             $resultValue = 0;
         } else {
@@ -7341,7 +7338,7 @@ function WSRemoveUserVisibilityToCourseInCatalogue($params)
             error_log('WSRemoveUserVisibilityToCourseInCatalogue user_id: '.$userId);
         }
 
-        if ($userId == 0) {
+        if (0 == $userId) {
             // If user was not found, there was a problem
             $resultValue = 0;
         } else {
@@ -7399,7 +7396,7 @@ $HTTP_RAW_POST_DATA = isset($HTTP_RAW_POST_DATA) ? $HTTP_RAW_POST_DATA : '';
 
 // If you send your data in utf8 then this value must be false.
 $decodeUTF8 = api_get_setting('registration.soap.php.decode_utf8');
-if ($decodeUTF8 === 'true') {
+if ('true' === $decodeUTF8) {
     $server->decode_utf8 = true;
 } else {
     $server->decode_utf8 = false;
diff --git a/public/main/webservices/soap.php b/public/main/webservices/soap.php
index cce50f754a..92c671a4a2 100644
--- a/public/main/webservices/soap.php
+++ b/public/main/webservices/soap.php
@@ -1,9 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.webservices
- */
 require_once __DIR__.'/../inc/global.inc.php';
 require_once __DIR__.'/webservice.php';
 
diff --git a/public/main/webservices/soap.test.php b/public/main/webservices/soap.test.php
index b92072235d..dde2afab9e 100644
--- a/public/main/webservices/soap.test.php
+++ b/public/main/webservices/soap.test.php
@@ -3,8 +3,6 @@
  * Test script for soap.php.
  *
  * @author Yannick Warnier <yannick.warnier@beeznest.com>
- *
- * @package chamilo.webservices
  */
 exit; //remove to enable
 // Include the necessary files, assuming this script is located in main/lp/ or something like that
diff --git a/public/main/webservices/soap_course.php b/public/main/webservices/soap_course.php
index 3d12446c42..9129540336 100644
--- a/public/main/webservices/soap_course.php
+++ b/public/main/webservices/soap_course.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Configures the WSCourse SOAP service.
- *
- * @package chamilo.webservices
  */
 require_once __DIR__.'/webservice_course.php';
 require_once __DIR__.'/soap.php';
diff --git a/public/main/webservices/soap_report.php b/public/main/webservices/soap_report.php
index 4b2ab334e6..e109f4a013 100644
--- a/public/main/webservices/soap_report.php
+++ b/public/main/webservices/soap_report.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Configures the WSReport SOAP service.
- *
- * @package chamilo.webservices
  */
 require_once __DIR__.'/webservice_report.php';
 require_once __DIR__.'/soap.php';
diff --git a/public/main/webservices/soap_session.php b/public/main/webservices/soap_session.php
index 267003cd0a..ef21f73c58 100644
--- a/public/main/webservices/soap_session.php
+++ b/public/main/webservices/soap_session.php
@@ -2,8 +2,6 @@
 /* For licensing terms, see /license.txt */
 /**
  * Configures the WSSession SOAP service.
- *
- * @package chamilo.webservices
  */
 require_once __DIR__.'/webservice_session.php';
 require_once __DIR__.'/soap.php';
diff --git a/public/main/webservices/soap_user.php b/public/main/webservices/soap_user.php
index 125e131677..85b94744df 100644
--- a/public/main/webservices/soap_user.php
+++ b/public/main/webservices/soap_user.php
@@ -2,16 +2,12 @@
 /* For licensing terms, see /license.txt */
 /**
  * Configures the WSUser SOAP service.
- *
- * @package chamilo.webservices
  */
 require_once __DIR__.'/webservice_user.php';
 require_once __DIR__.'/soap.php';
 
 /**
  * Configures the WSUser SOAP service.
- *
- * @package chamilo.webservices
  */
 $s = WSSoapServer::singleton();
 
diff --git a/public/main/webservices/test.php b/public/main/webservices/test.php
index 7b79e82eb9..964159dbe5 100644
--- a/public/main/webservices/test.php
+++ b/public/main/webservices/test.php
@@ -37,10 +37,10 @@ if (!empty($function)) {
 $list = scandir($serversys);
 $scripts = [];
 foreach ($list as $item) {
-    if (substr($item, 0, 1) == '.') {
+    if ('.' == substr($item, 0, 1)) {
         continue;
     }
-    if (substr($item, -8) == 'soap.php') {
+    if ('soap.php' == substr($item, -8)) {
         $scripts[] = $item;
     }
 }
diff --git a/public/main/webservices/testip.php b/public/main/webservices/testip.php
index 7c1928317f..fada60cd45 100644
--- a/public/main/webservices/testip.php
+++ b/public/main/webservices/testip.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- *  @package chamilo.webservices
- */
+
 $ip = trim($_SERVER['REMOTE_ADDR']);
 if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
     list($ip1, $ip2) = preg_split('/,/', $_SERVER['HTTP_X_FORWARDED_FOR']);
diff --git a/public/main/webservices/user_import/import.lib.php b/public/main/webservices/user_import/import.lib.php
index 33dc5f945c..37c5f3606c 100644
--- a/public/main/webservices/user_import/import.lib.php
+++ b/public/main/webservices/user_import/import.lib.php
@@ -13,11 +13,11 @@ function validate_data($users)
         foreach ($users as $index => $user) {
             // 1. Check whether mandatory fields have been set.
             $mandatory_fields = ['LastName', 'FirstName'];
-            if (api_get_setting('registration', 'email') == 'true') {
+            if ('true' == api_get_setting('registration', 'email')) {
                 $mandatory_fields[] = 'Email';
             }
             foreach ($mandatory_fields as $key => $field) {
-                if (!isset($user[$field]) || strlen($user[$field]) == 0) {
+                if (!isset($user[$field]) || 0 == strlen($user[$field])) {
                     $user['error'] = get_lang($field.'Mandatory');
                     $errors[] = $user;
                 }
@@ -47,7 +47,7 @@ function validate_data($users)
                 $errors[] = $user;
             }
             // 5. Check authentication source.
-            if (isset($user['AuthSource']) && strlen($user['AuthSource']) != 0) {
+            if (isset($user['AuthSource']) && 0 != strlen($user['AuthSource'])) {
                 if (!in_array($user['AuthSource'], $defined_auth_sources)) {
                     $user['error'] = get_lang('Authentication source unavailable.');
                     $errors[] = $user;
@@ -72,15 +72,15 @@ function complete_missing_data($user)
         );
     }
     // 2. Generate a password if necessary.
-    if (!isset($user['Password']) || strlen($user['Password']) == 0) {
+    if (!isset($user['Password']) || 0 == strlen($user['Password'])) {
         $user['Password'] = api_generate_password();
     }
     // 3. set status if not allready set.
-    if (!isset($user['Status']) || strlen($user['Status']) == 0) {
+    if (!isset($user['Status']) || 0 == strlen($user['Status'])) {
         $user['Status'] = 'user';
     }
     // 4. Set authsource if not allready set.
-    if (!isset($user['AuthSource']) || strlen($user['AuthSource']) == 0) {
+    if (!isset($user['AuthSource']) || 0 == strlen($user['AuthSource'])) {
         $user['AuthSource'] = PLATFORM_AUTH_SOURCE;
     }
 
diff --git a/public/main/webservices/user_import/service.php b/public/main/webservices/user_import/service.php
index 567bbbee63..754bd78093 100644
--- a/public/main/webservices/user_import/service.php
+++ b/public/main/webservices/user_import/service.php
@@ -42,7 +42,7 @@ function import_users_from_file($filepath, $security_key)
 
     // Get list of users
     $users = parse_csv_data($filepath);
-    if (count($users) == 0) {
+    if (0 == count($users)) {
         return $errors_returned[2];
     }
 
diff --git a/public/main/webservices/user_info.soap.php b/public/main/webservices/user_info.soap.php
index d59c8ad7f1..0bcc5d6aa4 100644
--- a/public/main/webservices/user_info.soap.php
+++ b/public/main/webservices/user_info.soap.php
@@ -6,8 +6,6 @@
  * http://drupal.org/project/chamilo.
  *
  * @author Yannick Warnier <yannick.warnier@dokeos.com>
- *
- * @package chamilo.webservices
  */
 require_once __DIR__.'/../inc/global.inc.php';
 // Create the server instance
@@ -209,7 +207,7 @@ function WSEventsList($username, $signature, $datestart = 0, $dateend = 0)
     $events_list = [];
 
     $user_id = UserManager::get_user_id_from_username($username);
-    if ($user_id === false) {
+    if (false === $user_id) {
         return $events_list;
     } // Error in user id recovery.
     $ds = substr($datestart, 0, 4).'-'.substr($datestart, 4, 2).'-'.substr($datestart, 6, 2).' 00:00:00';
diff --git a/public/main/webservices/webservice.php b/public/main/webservices/webservice.php
index 0779a02ba9..846e2229f7 100644
--- a/public/main/webservices/webservice.php
+++ b/public/main/webservices/webservice.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.webservices
- */
+
 require_once __DIR__.'/../inc/global.inc.php';
 
 /**
@@ -159,7 +157,7 @@ class WS
      */
     protected function getUserId($user_id_field_name, $user_id_value)
     {
-        if ($user_id_field_name == "chamilo_user_id") {
+        if ("chamilo_user_id" == $user_id_field_name) {
             if (UserManager::is_user_id_valid(intval($user_id_value))) {
                 return intval($user_id_value);
             } else {
@@ -170,7 +168,7 @@ class WS
                 $user_id_value,
                 $user_id_field_name
             );
-            if ($user_id == 0) {
+            if (0 == $user_id) {
                 return new WSError(100, "User not found");
             } else {
                 return $user_id;
@@ -190,10 +188,10 @@ class WS
      */
     protected function getCourseId($course_id_field_name, $course_id_value)
     {
-        if ($course_id_field_name == "chamilo_course_id") {
-            if (CourseManager::get_course_code_from_course_id(
+        if ("chamilo_course_id" == $course_id_field_name) {
+            if (null != CourseManager::get_course_code_from_course_id(
                     intval($course_id_value)
-                ) != null
+                )
             ) {
                 return intval($course_id_value);
             } else {
@@ -224,7 +222,7 @@ class WS
      */
     protected function getSessionId($session_id_field_name, $session_id_value)
     {
-        if ($session_id_field_name == "chamilo_session_id") {
+        if ("chamilo_session_id" == $session_id_field_name) {
             $session = SessionManager::fetch((int) $session_id_value);
             if (!empty($session)) {
                 return intval($session_id_value);
@@ -236,7 +234,7 @@ class WS
                 $session_id_value,
                 $session_id_field_name
             );
-            if ($session_id == 0) {
+            if (0 == $session_id) {
                 return new WSError(300, "Session not found");
             } else {
                 return $session_id;
diff --git a/public/main/webservices/webservice_course.php b/public/main/webservices/webservice_course.php
index 2637873e4b..720fdedc10 100644
--- a/public/main/webservices/webservice_course.php
+++ b/public/main/webservices/webservice_course.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.webservices
- */
+
 require_once __DIR__.'/../inc/global.inc.php';
 require_once __DIR__.'/webservice.php';
 
@@ -537,7 +535,7 @@ class WSCourse extends WS
     ) {
         // Add the original course id field name and value to the extra fields if needed
         $extras_associative = [];
-        if ($course_id_field_name != "chamilo_course_id") {
+        if ("chamilo_course_id" != $course_id_field_name) {
             $extras_associative[$course_id_field_name] = $course_id_value;
         }
         foreach ($extras as $extra) {
@@ -550,7 +548,7 @@ class WSCourse extends WS
         if ($course_admin_id instanceof WSError) {
             return $course_admin_id;
         }
-        if ($wanted_code == '') {
+        if ('' == $wanted_code) {
             $wanted_code = CourseManager::generate_course_code($title);
         }
         $result = create_course(
@@ -636,13 +634,13 @@ class WSCourse extends WS
             if (!empty($language)) {
                 $attributes['course_language'] = $language;
             }
-            if ($visibility != '') {
+            if ('' != $visibility) {
                 $attributes['visibility'] = (int) $visibility;
             }
-            if ($subscribe != '') {
+            if ('' != $subscribe) {
                 $attributes['subscribe'] = (int) $subscribe;
             }
-            if ($unsubscribe != '') {
+            if ('' != $unsubscribe) {
                 $attributes['unsubscribe'] = (int) $unsubscribe;
             }
             if (!empty($visual_code)) {
@@ -706,7 +704,7 @@ class WSCourse extends WS
                 $course_code = CourseManager::get_course_code_from_course_id(
                     $course_id
                 );
-                if ($state == 0) {
+                if (0 == $state) {
                     // Unsubscribe user
                     CourseManager::unsubscribe_user($user_id, $course_code);
 
diff --git a/public/main/webservices/webservice_report.php b/public/main/webservices/webservice_report.php
index f9b6a06ca6..bb852e57f9 100644
--- a/public/main/webservices/webservice_report.php
+++ b/public/main/webservices/webservice_report.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.webservices
- */
+
 require_once __DIR__.'/../inc/global.inc.php';
 require_once __DIR__.'/webservice.php';
 
diff --git a/public/main/webservices/webservice_session.php b/public/main/webservices/webservice_session.php
index 1a72c1f8d4..f936e2e9f5 100644
--- a/public/main/webservices/webservice_session.php
+++ b/public/main/webservices/webservice_session.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.webservices
- */
+
 require_once __DIR__.'/../inc/global.inc.php';
 require_once __DIR__.'/webservice.php';
 
@@ -437,7 +435,7 @@ class WSSession extends WS
         } else {
             // Add the Original session id to the extra fields
             $extras_associative = [];
-            if ($session_id_field_name != "chamilo_session_id") {
+            if ("chamilo_session_id" != $session_id_field_name) {
                 $extras_associative[$session_id_field_name] = $session_id_value;
             }
             foreach ($extras as $extra) {
@@ -615,7 +613,7 @@ class WSSession extends WS
             if ($user_id instanceof WSError) {
                 return $user_id;
             } else {
-                if ($state == 1) {
+                if (1 == $state) {
                     SessionManager::subscribeUsersToSession(
                         $session_id,
                         [$user_id]
@@ -678,7 +676,7 @@ class WSSession extends WS
                 if ($course_id instanceof WSError) {
                     return $course_id;
                 } else {
-                    if ($state == 1) {
+                    if (1 == $state) {
                         SessionManager::set_coach_to_course_session(
                             $user_id,
                             $session_id,
@@ -737,7 +735,7 @@ class WSSession extends WS
             if ($course_id instanceof WSError) {
                 return $course_id;
             } else {
-                if ($state == 1) {
+                if (1 == $state) {
                     SessionManager::add_courses_to_session(
                         $session_id,
                         [$course_id]
diff --git a/public/main/webservices/webservice_user.php b/public/main/webservices/webservice_user.php
index 30d46a9a60..49e7c6b2ff 100644
--- a/public/main/webservices/webservice_user.php
+++ b/public/main/webservices/webservice_user.php
@@ -1,8 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-/**
- * @package chamilo.webservices
- */
+
 require_once __DIR__.'/../inc/global.inc.php';
 require_once __DIR__.'/webservice.php';
 
@@ -432,10 +430,10 @@ class WSUser extends WS
         if ($user_id instanceof WSError) {
             return $user_id;
         } else {
-            if ($state == 0) {
+            if (0 == $state) {
                 UserManager::disable($user_id);
             } else {
-                if ($state == 1) {
+                if (1 == $state) {
                     UserManager::enable($user_id);
                 }
             }
@@ -539,7 +537,7 @@ class WSUser extends WS
     ) {
         // Add the original user id field name and value to the extra fields if needed
         $extras_associative = [];
-        if ($user_id_field_name != "chamilo_user_id") {
+        if ("chamilo_user_id" != $user_id_field_name) {
             $extras_associative[$user_id_field_name] = $user_id_value;
         }
         if (!empty($extras)) {
@@ -612,11 +610,11 @@ class WSUser extends WS
         if ($user_id instanceof WSError) {
             return $user_id;
         } else {
-            if ($password == '') {
+            if ('' == $password) {
                 $password = null;
             }
             $user_info = api_get_user_info($user_id);
-            if (count($extras) == 0) {
+            if (0 == count($extras)) {
                 $extras = null;
             }
 
diff --git a/public/main/wiki/diff.inc.php b/public/main/wiki/diff.inc.php
index 2aac3e71d3..c7e253539b 100644
--- a/public/main/wiki/diff.inc.php
+++ b/public/main/wiki/diff.inc.php
@@ -10,8 +10,6 @@
  * as published by the FREE SOFTWARE FOUNDATION. The GPL is available
  * through the world-wide-web at http://www.gnu.org/copyleft/gpl.html
  * @author Frederic Minne <zefredz@gmail.com>
- *
- * @package Wiki
  */
 define("DIFF_EQUAL", "=");
 define("DIFF_ADDED", "+");
@@ -94,11 +92,11 @@ function str_split_on_new_line($str)
 {
     $content = [];
 
-    if (api_strpos($str, "\r\n") !== false) {
+    if (false !== api_strpos($str, "\r\n")) {
         $content = explode("\r\n", $str);
-    } elseif (api_strpos($str, "\n") !== false) {
+    } elseif (false !== api_strpos($str, "\n")) {
         $content = explode("\n", $str);
-    } elseif (api_strpos($str, "\r") !== false) {
+    } elseif (false !== api_strpos($str, "\r")) {
         $content = explode("\r", $str);
     } else {
         $content[] = $str;
@@ -120,9 +118,9 @@ function str_split_on_new_line($str)
  */
 function format_line($line, $type, $value, $skip_empty = false)
 {
-    if (trim($value) == "" && $skip_empty) {
+    if ("" == trim($value) && $skip_empty) {
         return "";
-    } elseif (trim($value) == "") {
+    } elseif ("" == trim($value)) {
         $value = '&nbsp;';
     }
 
@@ -153,9 +151,9 @@ function format_line($line, $type, $value, $skip_empty = false)
  */
 function format_table_line($line, $type, $value, $skip_empty = false)
 {
-    if (trim($value) == "" && $skip_empty) {
+    if ("" == trim($value) && $skip_empty) {
         return "";
-    } elseif (trim($value) == "") {
+    } elseif ("" == trim($value)) {
         $value = '&nbsp;';
     }
 
diff --git a/public/main/wiki/index.php b/public/main/wiki/index.php
index 58a0dd601c..ca902190cf 100644
--- a/public/main/wiki/index.php
+++ b/public/main/wiki/index.php
@@ -4,8 +4,6 @@
 /**
  * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University, Belgium
  * @author Juan Carlos Raña <herodoto@telefonica.net>
- *
- * @package chamilo.wiki
  */
 require_once __DIR__.'/../inc/global.inc.php';
 require_once 'wiki.inc.php';
@@ -89,7 +87,7 @@ $wiki->blockConcurrentEditions(api_get_user_id(), $action);
 
 ob_start();
 $handleAction = $wiki->handleAction($action);
-if (!$handleAction && $action == 'export_to_pdf') {
+if (!$handleAction && 'export_to_pdf' == $action) {
     $wiki->handleAction('showpage');
 }
 $content = ob_get_contents();
diff --git a/public/main/wiki/wiki.inc.php b/public/main/wiki/wiki.inc.php
index 81e11e1f13..f2e9290ee8 100644
--- a/public/main/wiki/wiki.inc.php
+++ b/public/main/wiki/wiki.inc.php
@@ -81,7 +81,7 @@ class Wiki
         $result = Database::query($sql);
         $num = Database::num_rows($result);
         // the value has not been found and is this available
-        if ($num == 0) {
+        if (0 == $num) {
             return true;
         } else {
             // the value has been found
@@ -109,10 +109,10 @@ class Wiki
         $all_links = [];
 
         foreach ($input_array as $key => $value) {
-            if (isset($input_array[$key - 1]) && $input_array[$key - 1] == '[[' &&
-                isset($input_array[$key + 1]) && $input_array[$key + 1] == ']]'
+            if (isset($input_array[$key - 1]) && '[[' == $input_array[$key - 1] &&
+                isset($input_array[$key + 1]) && ']]' == $input_array[$key + 1]
             ) {
-                if (api_strpos($value, "|") !== false) {
+                if (false !== api_strpos($value, "|")) {
                     $full_link_array = explode("|", $value);
                     $link = trim($full_link_array[0]);
                     $title = trim($full_link_array[1]);
@@ -239,10 +239,10 @@ class Wiki
         foreach ($input_array as $key => $value) {
             //now doubles brackets
             if (isset($input_array[$key - 1]) &&
-                $input_array[$key - 1] == '[[' && $input_array[$key + 1] == ']]'
+                '[[' == $input_array[$key - 1] && ']]' == $input_array[$key + 1]
             ) {
                 // now full wikilink
-                if (api_strpos($value, "|") !== false) {
+                if (false !== api_strpos($value, "|")) {
                     $full_link_array = explode("|", $value);
                     $link = trim(strip_tags($full_link_array[0]));
                     $title = trim($full_link_array[1]);
@@ -252,7 +252,7 @@ class Wiki
                 }
 
                 //if wikilink is homepage
-                if ($link == 'index') {
+                if ('index' == $link) {
                     $title = get_lang('Home');
                 }
                 if ($link == get_lang('Home')) {
@@ -319,7 +319,7 @@ class Wiki
         // are not made here, but through the interce buttons
 
         // cleaning the variables
-        if (api_get_setting('htmlpurifier_wiki') == 'true') {
+        if ('true' == api_get_setting('htmlpurifier_wiki')) {
             //$purifier = new HTMLPurifier();
             $values['content'] = Security::remove_XSS($values['content']);
         }
@@ -343,13 +343,13 @@ class Wiki
             $_clean['fprogress3'] = $values['fprogress3'];
         }
 
-        if (isset($values['initstartdate']) && $values['initstartdate'] == 1) {
+        if (isset($values['initstartdate']) && 1 == $values['initstartdate']) {
             $_clean['startdate_assig'] = $values['startdate_assig'];
         } else {
             $_clean['startdate_assig'] = null;
         }
 
-        if (isset($values['initenddate']) && $values['initenddate'] == 1) {
+        if (isset($values['initenddate']) && 1 == $values['initenddate']) {
             $_clean['enddate_assig'] = $values['enddate_assig'];
         } else {
             $_clean['enddate_assig'] = null;
@@ -411,7 +411,7 @@ class Wiki
                 $groupInfo
             );
 
-            if ($values['page_id'] == 0) {
+            if (0 == $values['page_id']) {
                 $sql = 'UPDATE '.$tbl_wiki.' SET page_id="'.$id.'"
                         WHERE c_id = '.$course_id.' AND iid ="'.$id.'"';
                 Database::query($sql);
@@ -419,7 +419,7 @@ class Wiki
         }
 
         // Update wiki config
-        if ($values['reflink'] == 'index' && $version == 1) {
+        if ('index' == $values['reflink'] && 1 == $version) {
             $params = [
                 'c_id' => $course_id,
                 'page_id' => $id,
@@ -612,7 +612,7 @@ class Wiki
         $session_id = api_get_session_id();
         // Unlike ordinary pages of pages of assignments.
         // Allow create a ordinary page although there is a assignment with the same name
-        if ($_clean['assignment'] == 2 || $_clean['assignment'] == 1) {
+        if (2 == $_clean['assignment'] || 1 == $_clean['assignment']) {
             $page = str_replace(
                 ' ',
                 '_',
@@ -625,7 +625,7 @@ class Wiki
         $_clean['title'] = trim($values['title']);
         $_clean['content'] = $values['content'];
 
-        if (api_get_setting('htmlpurifier_wiki') === 'true') {
+        if ('true' === api_get_setting('htmlpurifier_wiki')) {
             $purifier = new HTMLPurifier();
             $_clean['content'] = $purifier->purify($_clean['content']);
         }
@@ -635,7 +635,7 @@ class Wiki
             return false;
         }
 
-        if ($_clean['assignment'] == 2) {
+        if (2 == $_clean['assignment']) {
             //config by default for individual assignment (students)
             //Identifies the user as a creator, not the teacher who created
             $_clean['user_id'] = intval($assig_user_id);
@@ -668,13 +668,13 @@ class Wiki
         $_clean['fprogress2'] = isset($values['fprogress2']) ? $values['fprogress2'] : '';
         $_clean['fprogress3'] = isset($values['fprogress3']) ? $values['fprogress3'] : '';
 
-        if (isset($values['initstartdate']) && $values['initstartdate'] == 1) {
+        if (isset($values['initstartdate']) && 1 == $values['initstartdate']) {
             $_clean['startdate_assig'] = $values['startdate_assig'];
         } else {
             $_clean['startdate_assig'] = null;
         }
 
-        if (isset($values['initenddate']) && $values['initenddate'] == 1) {
+        if (isset($values['initenddate']) && 1 == $values['initenddate']) {
             $_clean['enddate_assig'] = $values['enddate_assig'];
         } else {
             $_clean['enddate_assig'] = null;
@@ -687,7 +687,7 @@ class Wiki
         $course_id = api_get_course_int_id();
 
         // Filter no _uass
-        if (api_strtoupper(trim($values['title'])) === 'INDEX') {
+        if ('INDEX' === api_strtoupper(trim($values['title']))) {
             Display::addFlash(
                 Display::return_message(
                     get_lang('To start Group wiki go and edit Main page'),
@@ -812,7 +812,7 @@ class Wiki
 
         if ((api_is_allowed_to_edit(false, true) ||
             api_is_platform_admin()) &&
-            isset($row['reflink']) && $row['reflink'] != 'index'
+            isset($row['reflink']) && 'index' != $row['reflink']
         ) {
             $form->addElement(
                 'advanced_settings',
@@ -963,13 +963,13 @@ class Wiki
             } elseif (!self::double_post($_POST['wpost_id'])) {
                 //double post
             } else {
-                if (isset($values['assignment']) && $values['assignment'] == 1) {
+                if (isset($values['assignment']) && 1 == $values['assignment']) {
                     self::auto_add_page_users($values);
                 }
 
                 $return_message = self::save_new_wiki($values);
 
-                if ($return_message == false) {
+                if (false == $return_message) {
                     Display::addFlash(
                         Display::return_message(
                             get_lang('Your changes have been saved. You still have to give a name to the page'),
@@ -1069,7 +1069,7 @@ class Wiki
         $groupInfo = GroupManager::get_group_properties(api_get_group_id());
 
         // if both are empty and we are displaying the index page then we display the default text.
-        if ($row['content'] == '' && $row['title'] == '' && $page == 'index') {
+        if ('' == $row['content'] && '' == $row['title'] && 'index' == $page) {
             if (api_is_allowed_to_edit(false, true) ||
                 api_is_platform_admin() ||
                 GroupManager::is_user_in_group(api_get_user_id(), $groupInfo) ||
@@ -1101,14 +1101,14 @@ class Wiki
 
         //assignment mode: identify page type
         $icon_assignment = null;
-        if ($row['assignment'] == 1) {
+        if (1 == $row['assignment']) {
             $icon_assignment = Display::return_icon(
                 'wiki_assignment.png',
                 get_lang('This page is an assignment proposed by a trainer'),
                 '',
                 ICON_SIZE_SMALL
             );
-        } elseif ($row['assignment'] == 2) {
+        } elseif (2 == $row['assignment']) {
             $icon_assignment = Display::return_icon(
                 'wiki_work.png',
                 get_lang('Learner paper'),
@@ -1129,10 +1129,10 @@ class Wiki
         }
 
         // Show page. Show page to all users if isn't hide page. Mode assignments: if student is the author, can view
-        if ($KeyVisibility == "1" ||
+        if ("1" == $KeyVisibility ||
             api_is_allowed_to_edit(false, true) ||
             api_is_platform_admin() ||
-            ($row['assignment'] == 2 && $KeyVisibility == "0" && (api_get_user_id() == $row['user_id'])) ||
+            (2 == $row['assignment'] && "0" == $KeyVisibility && (api_get_user_id() == $row['user_id'])) ||
             api_is_allowed_in_course()
         ) {
             $actionsLeft = '';
@@ -1168,7 +1168,7 @@ class Wiki
             if (api_is_allowed_to_edit(false, true) ||
                 api_is_platform_admin()
             ) {
-                if (self::check_protect_page() == 1) {
+                if (1 == self::check_protect_page()) {
                     $protect_page = Display::return_icon(
                         'lock.png',
                         get_lang('This page is protected. Trainers only can change it'),
@@ -1198,7 +1198,7 @@ class Wiki
             if (api_is_allowed_to_edit(false, true) ||
                 api_is_platform_admin()
             ) {
-                if (self::check_visibility_page() == 1) {
+                if (1 == self::check_visibility_page()) {
                     $visibility_page = Display::return_icon(
                         'visible.png',
                         get_lang('Now the page is visible by all users'),
@@ -1224,7 +1224,7 @@ class Wiki
 
             //page action: notification
             if (api_is_allowed_to_session_edit()) {
-                if (self::check_notify_page($page) == 1) {
+                if (1 == self::check_notify_page($page)) {
                     $notify_page = Display::return_icon(
                         'messagebox_info.png',
                         get_lang('Notify me by e-mail when somebody replies'),
@@ -1515,10 +1515,10 @@ class Wiki
             api_is_platform_admin()
         ) {
             if (isset($_GET['actionpage'])) {
-                if ($_GET['actionpage'] == 'lockaddnew' && $status_addlock == 1) {
+                if ('lockaddnew' == $_GET['actionpage'] && 1 == $status_addlock) {
                     $status_addlock = 0;
                 }
-                if ($_GET['actionpage'] == 'unlockaddnew' && $status_addlock == 0) {
+                if ('unlockaddnew' == $_GET['actionpage'] && 0 == $status_addlock) {
                     $status_addlock = 1;
                 }
                 $sql = 'UPDATE '.$tbl_wiki.' SET
@@ -1566,10 +1566,10 @@ class Wiki
 
         // Change status
         if (api_is_allowed_to_edit(false, true) || api_is_platform_admin()) {
-            if (isset($_GET['actionpage']) && $_GET['actionpage'] == 'lock' && $status_editlock == 0) {
+            if (isset($_GET['actionpage']) && 'lock' == $_GET['actionpage'] && 0 == $status_editlock) {
                 $status_editlock = 1;
             }
-            if (isset($_GET['actionpage']) && $_GET['actionpage'] == 'unlock' && $status_editlock == 1) {
+            if (isset($_GET['actionpage']) && 'unlock' == $_GET['actionpage'] && 1 == $status_editlock) {
                 $status_editlock = 0;
             }
 
@@ -1620,14 +1620,14 @@ class Wiki
             api_is_platform_admin()
         ) {
             if (isset($_GET['actionpage']) &&
-                $_GET['actionpage'] == 'visible' &&
-                $status_visibility == 0
+                'visible' == $_GET['actionpage'] &&
+                0 == $status_visibility
             ) {
                 $status_visibility = 1;
             }
             if (isset($_GET['actionpage']) &&
-                $_GET['actionpage'] == 'invisible' &&
-                $status_visibility == 1
+                'invisible' == $_GET['actionpage'] &&
+                1 == $status_visibility
             ) {
                 $status_visibility = 0;
             }
@@ -1692,14 +1692,14 @@ class Wiki
         //change status
         if (api_is_allowed_to_edit(false, true) || api_is_platform_admin()) {
             if (isset($_GET['actionpage']) &&
-                $_GET['actionpage'] == 'showdisc' &&
-                $status_visibility_disc == 0
+                'showdisc' == $_GET['actionpage'] &&
+                0 == $status_visibility_disc
             ) {
                 $status_visibility_disc = 1;
             }
             if (isset($_GET['actionpage']) &&
-                $_GET['actionpage'] == 'hidedisc' &&
-                $status_visibility_disc == 1
+                'hidedisc' == $_GET['actionpage'] &&
+                1 == $status_visibility_disc
             ) {
                 $status_visibility_disc = 0;
             }
@@ -1758,14 +1758,14 @@ class Wiki
         //change status
         if (api_is_allowed_to_edit() || api_is_platform_admin()) {
             if (isset($_GET['actionpage']) &&
-                $_GET['actionpage'] == 'lockdisc' &&
-                $status_addlock_disc == 0
+                'lockdisc' == $_GET['actionpage'] &&
+                0 == $status_addlock_disc
             ) {
                 $status_addlock_disc = 1;
             }
             if (isset($_GET['actionpage']) &&
-                $_GET['actionpage'] == 'unlockdisc' &&
-                $status_addlock_disc == 1
+                'unlockdisc' == $_GET['actionpage'] &&
+                1 == $status_addlock_disc
             ) {
                 $status_addlock_disc = 0;
             }
@@ -1825,14 +1825,14 @@ class Wiki
             api_is_platform_admin()
         ) {
             if (isset($_GET['actionpage']) &&
-                $_GET['actionpage'] == 'lockrating' &&
-                $status_ratinglock_disc == 0
+                'lockrating' == $_GET['actionpage'] &&
+                0 == $status_ratinglock_disc
             ) {
                 $status_ratinglock_disc = 1;
             }
             if (isset($_GET['actionpage']) &&
-                $_GET['actionpage'] == 'unlockrating' &&
-                $status_ratinglock_disc == 1
+                'unlockrating' == $_GET['actionpage'] &&
+                1 == $status_ratinglock_disc
             ) {
                 $status_ratinglock_disc = 0;
             }
@@ -1907,8 +1907,8 @@ class Wiki
 
         // Change status
         if (isset($_GET['actionpage']) &&
-            $_GET['actionpage'] == 'locknotify' &&
-            $status_notify == 0
+            'locknotify' == $_GET['actionpage'] &&
+            0 == $status_notify
         ) {
             $sql = "SELECT id FROM $tbl_wiki_mailcue
                     WHERE c_id = $course_id AND id = $id AND user_id = $userId";
@@ -1917,7 +1917,7 @@ class Wiki
             if (Database::num_rows($result)) {
                 $exist = true;
             }
-            if ($exist == false) {
+            if (false == $exist) {
                 $sql = "INSERT INTO ".$tbl_wiki_mailcue." (c_id, id, user_id, type, group_id, session_id) VALUES
                 ($course_id, '".$id."','".api_get_user_id()."','P','".$groupId."','".$session_id."')";
                 Database::query($sql);
@@ -1926,8 +1926,8 @@ class Wiki
         }
 
         if (isset($_GET['actionpage']) &&
-            $_GET['actionpage'] == 'unlocknotify' &&
-            $status_notify == 1
+            'unlocknotify' == $_GET['actionpage'] &&
+            1 == $status_notify
         ) {
             $sql = 'DELETE FROM '.$tbl_wiki_mailcue.'
                     WHERE 
@@ -1986,8 +1986,8 @@ class Wiki
 
         // change status
         if (isset($_GET['actionpage']) &&
-            $_GET['actionpage'] == 'locknotifydisc' &&
-            $status_notify_disc == 0
+            'locknotifydisc' == $_GET['actionpage'] &&
+            0 == $status_notify_disc
         ) {
             $sql = "INSERT INTO ".$tbl_wiki_mailcue." (c_id, id, user_id, type, group_id, session_id) VALUES
             ($course_id, '".$id."','".api_get_user_id()."','D','".$groupId."','".$session_id."')";
@@ -1995,8 +1995,8 @@ class Wiki
             $status_notify_disc = 1;
         }
         if (isset($_GET['actionpage']) &&
-            $_GET['actionpage'] == 'unlocknotifydisc' &&
-            $status_notify_disc == 1
+            'unlocknotifydisc' == $_GET['actionpage'] &&
+            1 == $status_notify_disc
         ) {
             $sql = 'DELETE FROM '.$tbl_wiki_mailcue.'
                     WHERE 
@@ -2044,8 +2044,8 @@ class Wiki
 
         //change status
         if (isset($_GET['actionpage']) &&
-            $_GET['actionpage'] == 'locknotifyall' &&
-            $status_notify_all == 0
+            'locknotifyall' == $_GET['actionpage'] &&
+            0 == $status_notify_all
         ) {
             $sql = "INSERT INTO ".$tbl_wiki_mailcue." (c_id, user_id, type, group_id, session_id) VALUES
             ($course_id, '".api_get_user_id()."','F','".$groupId."','".$session_id."')";
@@ -2055,8 +2055,8 @@ class Wiki
 
         if (isset($_GET['actionpage']) &&
             isset($_GET['actionpage']) &&
-            $_GET['actionpage'] == 'unlocknotifyall' &&
-            $status_notify_all == 1
+            'unlocknotifyall' == $_GET['actionpage'] &&
+            1 == $status_notify_all
         ) {
             $sql = 'DELETE FROM '.$tbl_wiki_mailcue.'
                    WHERE
@@ -2095,7 +2095,7 @@ class Wiki
         $group_name = $group_properties['name'];
         $allow_send_mail = false; //define the variable to below
         $email_assignment = null;
-        if ($type == 'P') {
+        if ('P' == $type) {
             //if modifying a wiki page
             //first, current author and time
             //Who is the author?
@@ -2122,7 +2122,7 @@ class Wiki
             $row = Database::fetch_array($result);
             $id = $row['id'];
             $email_page_name = $row['title'];
-            if ($row['visibility'] == 1) {
+            if (1 == $row['visibility']) {
                 $allow_send_mail = true; //if visibility off - notify off
                 $sql = 'SELECT * FROM '.$tbl_wiki_mailcue.'
                         WHERE
@@ -2138,7 +2138,7 @@ class Wiki
                     '<strong>'.$email_page_name.'</strong> '.
                     get_lang('Group wiki');
             }
-        } elseif ($type == 'D') {
+        } elseif ('D' == $type) {
             //if added a post to discuss
             //first, current author and time
             //Who is the author of last message?
@@ -2163,7 +2163,7 @@ class Wiki
             $row = Database::fetch_array($result);
 
             $email_page_name = $row['title'];
-            if ($row['visibility_disc'] == 1) {
+            if (1 == $row['visibility_disc']) {
                 $allow_send_mail = true; //if visibility off - notify off
                 $sql = 'SELECT * FROM '.$tbl_wiki_mailcue.'
                         WHERE
@@ -2181,7 +2181,7 @@ class Wiki
                         'Group wiki'
                     );
             }
-        } elseif ($type == 'A') {
+        } elseif ('A' == $type) {
             //for added pages
             $id = 0; //for tbl_wiki_mailcue
             $sql = 'SELECT * FROM '.$tbl_wiki.'
@@ -2205,12 +2205,12 @@ class Wiki
             $seconds = substr($row['dtime'], 17, 2);
             $email_date_changes = $day.' '.$month.' '.$year.' '.$hours.":".$minutes.":".$seconds;
 
-            if ($row['assignment'] == 0) {
+            if (0 == $row['assignment']) {
                 $allow_send_mail = true;
-            } elseif ($row['assignment'] == 1) {
+            } elseif (1 == $row['assignment']) {
                 $email_assignment = get_lang('This page is an assignment proposed by a trainer').' ('.get_lang('individual assignment mode').')';
                 $allow_send_mail = true;
-            } elseif ($row['assignment'] == 2) {
+            } elseif (2 == $row['assignment']) {
                 $allow_send_mail = false; //Mode tasks: avoids notifications to all users about all users
             }
 
@@ -2226,7 +2226,7 @@ class Wiki
             $result = Database::query($sql);
             $emailtext = get_lang('EmailGroup wikiPageAdded').' <strong>'.
                 $email_page_name.'</strong> '.get_lang('in').' '.get_lang('Group wiki');
-        } elseif ($type == 'E') {
+        } elseif ('E' == $type) {
             $id = 0;
             $allow_send_mail = true;
             // Who is the author?
@@ -2261,7 +2261,7 @@ class Wiki
                         $userinfo['firstname'],
                         $userinfo['lastname']
                     ).',<br /><br />';
-                if ($session_id == 0) {
+                if (0 == $session_id) {
                     $email_body .= $emailtext.' <strong>'.$_course['name'].' - '.$group_name.'</strong><br /><br /><br />';
                 } else {
                     $email_body .= $emailtext.' <strong>'.$_course['name'].' ('.api_get_session_name(
@@ -2402,10 +2402,10 @@ class Wiki
         $wikiContents = str_replace('{CONTENT}', $wikiContents, $template);
         // replace relative path by absolute path for courses, so you can see
         // items into this page wiki (images, mp3, etc..) exported in documents
-        if (api_strpos(
+        if (false !== api_strpos(
                 $wikiContents,
                 '../..'.api_get_path(REL_COURSE_PATH)
-            ) !== false) {
+            )) {
             $web_course_path = api_get_path(WEB_COURSE_PATH);
             $wikiContents = str_replace(
                 '../..'.api_get_path(REL_COURSE_PATH),
@@ -2443,7 +2443,7 @@ class Wiki
     public function export_to_pdf($id, $course_code)
     {
         if (!api_is_platform_admin()) {
-            if (api_get_setting('students_export2pdf') !== 'true') {
+            if ('true' !== api_get_setting('students_export2pdf')) {
                 Display::addFlash(
                     Display::return_message(
                         get_lang('PDF download is not allowed for students'),
@@ -2539,7 +2539,7 @@ class Wiki
         $session_id = $this->session_id;
         $groupId = api_get_group_id();
         $groupInfo = GroupManager::get_group_properties($groupId);
-        if ($groupId == 0) {
+        if (0 == $groupId) {
             //extract course members
             if (!empty($session_id)) {
                 $a_users_to_add = CourseManager::get_user_list_from_course_code(
@@ -2643,7 +2643,7 @@ class Wiki
                     }
                 }
 
-                if ($assignment_type == 1) {
+                if (1 == $assignment_type) {
                     $values['title'] = $title_orig;
                     $values['content'] = '<div align="center" style="background-color: #F5F8FB; border:solid; border-color: #E6E6E6">
                     <table border="0">
@@ -2680,7 +2680,7 @@ class Wiki
         foreach ($a_users_to_add as $o_user_to_add) {
             if ($o_user_to_add['user_id'] == $userId) {
                 $assig_user_id = $o_user_to_add['user_id'];
-                if ($assignment_type == 1) {
+                if (1 == $assignment_type) {
                     $values['title'] = $title_orig;
                     $values['comment'] = get_lang('Assignment proposed by the trainer');
                     sort($all_students_pages);
@@ -2724,8 +2724,8 @@ class Wiki
 
         //only by professors when page is hidden
         if (api_is_allowed_to_edit(false, true) || api_is_platform_admin()) {
-            if ($all_vers == '1') {
-                if ($search_content == '1') {
+            if ('1' == $all_vers) {
+                if ('1' == $search_content) {
                     $sql = "SELECT * FROM ".$tbl_wiki."
                             WHERE
                                 c_id = $course_id AND
@@ -2742,7 +2742,7 @@ class Wiki
                         )."%' AND ".$groupfilter.$condition_session;
                 }
             } else {
-                if ($search_content == '1') {
+                if ('1' == $search_content) {
                     // warning don't use group by reflink because don't return the last version
                     $sql = "SELECT * FROM ".$tbl_wiki." s1
                             WHERE
@@ -2774,8 +2774,8 @@ class Wiki
                 }
             }
         } else {
-            if ($all_vers == '1') {
-                if ($search_content == '1') {
+            if ('1' == $all_vers) {
+                if ('1' == $search_content) {
                     //search all pages and all versions
                     $sql = "SELECT * FROM ".$tbl_wiki."
                             WHERE
@@ -2793,7 +2793,7 @@ class Wiki
                                 ".$groupfilter.$condition_session;
                 }
             } else {
-                if ($search_content == '1') {
+                if ('1' == $search_content) {
                     $sql = "SELECT * FROM ".$tbl_wiki." s1
                             WHERE
                                 s1.c_id = $course_id AND
@@ -2839,21 +2839,21 @@ class Wiki
                 $seconds = substr($obj->dtime, 17, 2);
 
                 //get type assignment icon
-                if ($obj->assignment == 1) {
+                if (1 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_assignment.png',
                         get_lang('Assignment proposed by the trainer'),
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($obj->assignment == 2) {
+                } elseif (2 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_work.png',
                         get_lang('Learner paper'),
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($obj->assignment == 0) {
+                } elseif (0 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'px_transparent.gif'
                     );
@@ -2861,7 +2861,7 @@ class Wiki
                 $row = [];
                 $row[] = $ShowAssignment;
 
-                if ($all_vers == '1') {
+                if ('1' == $all_vers) {
                     $row[] = '<a href="'.api_get_self().'?'.api_get_cidreq(
                         ).'&action=showpage&title='.api_htmlentities(
                             urlencode($obj->reflink)
@@ -2881,12 +2881,12 @@ class Wiki
                         $obj->title.'</a>';
                 }
 
-                $row[] = ($obj->user_id != 0 && $userinfo !== false) ? UserManager::getUserProfileLink(
+                $row[] = (0 != $obj->user_id && false !== $userinfo) ? UserManager::getUserProfileLink(
                     $userinfo
                 ) : get_lang('Anonymous').' ('.$obj->user_ip.')';
                 $row[] = $year.'-'.$month.'-'.$day.' '.$hours.":".$minutes.":".$seconds;
 
-                if ($all_vers == '1') {
+                if ('1' == $all_vers) {
                     $row[] = $obj->version;
                 } else {
                     $showdelete = '';
@@ -2982,7 +2982,7 @@ class Wiki
                 ['style' => 'width:30px;']
             );
             $table->set_header(1, get_lang('Title'), true);
-            if ($all_vers == '1') {
+            if ('1' == $all_vers) {
                 $table->set_header(2, get_lang('Author'), true);
                 $table->set_header(3, get_lang('Date'), true);
                 $table->set_header(4, get_lang('Version'), true);
@@ -3021,7 +3021,7 @@ class Wiki
     {
         $tbl_wiki = $this->tbl_wiki;
         $course_id = api_get_course_int_id();
-        if ($id === false) {
+        if (false === $id) {
             return [];
         }
         $id = intval($id);
@@ -3201,7 +3201,7 @@ class Wiki
                 // be available or if a page was edited and saved by its author
                 if ($time_editing > $max_edit_time ||
                     ($is_editing_block['is_editing'] == $userId &&
-                        $action != 'edit')
+                        'edit' != $action)
                 ) {
                     self::updateWikiIsEditing($is_editing_block['is_editing']);
                 }
@@ -3616,7 +3616,7 @@ class Wiki
             $wiki_add_lock = $row['addlock'];
         }
 
-        if ($wiki_add_lock == 1) {
+        if (1 == $wiki_add_lock) {
             $status_add_new_pag = get_lang('Yes');
         } else {
             $status_add_new_pag = get_lang('No');
@@ -3916,7 +3916,7 @@ class Wiki
             while ($obj = Database::fetch_object($allpages)) {
                 $userinfo = api_get_user_info($obj->user_id);
                 $row = [];
-                if ($obj->user_id != 0 && $userinfo !== false) {
+                if (0 != $obj->user_id && false !== $userinfo) {
                     $row[] = UserManager::getUserProfileLink($userinfo).'
                             <a href="'.api_get_self(
                         ).'?cidReq='.$_course['code'].'&action=usercontrib&user_id='.urlencode(
@@ -3980,8 +3980,8 @@ class Wiki
         $groupfilter = $this->groupfilter;
         $tbl_wiki_discuss = $this->tbl_wiki_discuss;
 
-        if (api_get_session_id() != 0 &&
-            api_is_allowed_to_session_edit(false, true) == false
+        if (0 != api_get_session_id() &&
+            false == api_is_allowed_to_session_edit(false, true)
         ) {
             api_not_allowed();
         }
@@ -4050,14 +4050,14 @@ class Wiki
 
         // mode assignment: previous to show  page type
         $icon_assignment = null;
-        if ($row['assignment'] == 1) {
+        if (1 == $row['assignment']) {
             $icon_assignment = Display::return_icon(
                 'wiki_assignment.png',
                 get_lang('This page is an assignment proposed by a trainer'),
                 '',
                 ICON_SIZE_SMALL
             );
-        } elseif ($row['assignment'] == 2) {
+        } elseif (2 == $row['assignment']) {
             $icon_assignment = Display::return_icon(
                 'wiki_work.png',
                 get_lang('Learner paperExtra'),
@@ -4070,21 +4070,21 @@ class Wiki
         $avg_WPost_score = null;
 
         // Show title and form to discuss if page exist
-        if ($id != '') {
+        if ('' != $id) {
             // Show discussion to students if isn't hidden.
             // Show page to all teachers if is hidden.
             // Mode assignments: If is hidden, show pages to student only if student is the author
-            if ($row['visibility_disc'] == 1 ||
+            if (1 == $row['visibility_disc'] ||
                 api_is_allowed_to_edit(false, true) ||
                 api_is_platform_admin() ||
-                ($row['assignment'] == 2 && $row['visibility_disc'] == 0 && (api_get_user_id() == $row['user_id']))
+                (2 == $row['assignment'] && 0 == $row['visibility_disc'] && (api_get_user_id() == $row['user_id']))
             ) {
                 echo '<div id="wikititle">';
                 // discussion action: protecting (locking) the discussion
                 $addlock_disc = null;
                 $lock_unlock_disc = null;
                 if (api_is_allowed_to_edit(false, true) || api_is_platform_admin()) {
-                    if (self::check_addlock_discuss() == 1) {
+                    if (1 == self::check_addlock_discuss()) {
                         $addlock_disc = Display::return_icon(
                             'unlock.png',
                             get_lang('Now all members can add comments to this discussion'),
@@ -4112,7 +4112,7 @@ class Wiki
                 $visibility_disc = null;
                 $hide_show_disc = null;
                 if (api_is_allowed_to_edit(false, true) || api_is_platform_admin()) {
-                    if (self::check_visibility_discuss() == 1) {
+                    if (1 == self::check_visibility_discuss()) {
                         /// TODO: 	Fix Mode assignments: If is hidden, show discussion to student only if student is the author
                         $visibility_disc = Display::return_icon(
                             'visible.png',
@@ -4141,7 +4141,7 @@ class Wiki
                 $lock_unlock_rating_disc = null;
                 $ratinglock_disc = null;
                 if (api_is_allowed_to_edit(false, true) || api_is_platform_admin()) {
-                    if (self::check_ratinglock_discuss() == 1) {
+                    if (1 == self::check_ratinglock_discuss()) {
                         $ratinglock_disc = Display::return_icon(
                             'star.png',
                             get_lang('Now all members can rate this page'),
@@ -4167,7 +4167,7 @@ class Wiki
                 echo '</span>';
 
                 // discussion action: email notification
-                if (self::check_notify_discuss($page) == 1) {
+                if (1 == self::check_notify_discuss($page)) {
                     $notify_disc = Display::return_icon(
                         'messagebox_info.png',
                         get_lang('Notify by e-mail of new comments about this page is allowed'),
@@ -4192,13 +4192,13 @@ class Wiki
                 echo $icon_assignment.'&nbsp;&nbsp;&nbsp;'.api_htmlentities(
                         $row['title']
                     );
-                if ($lastuserinfo !== false) {
+                if (false !== $lastuserinfo) {
                     echo ' ('.get_lang('The latest version was edited by').' '.
                         UserManager::getUserProfileLink($lastuserinfo).' '.$lastversiondate.$countWPost.')'.$avg_WPost_score.' '; //TODO: read average score
                 }
 
                 echo '</div>';
-                if ($row['addlock_disc'] == 1 || api_is_allowed_to_edit(false, true) || api_is_platform_admin()) {
+                if (1 == $row['addlock_disc'] || api_is_allowed_to_edit(false, true) || api_is_platform_admin()) {
                     //show comments but students can't add theirs
                     ?>
                     <div class="panel panel-default">
@@ -4221,7 +4221,7 @@ class Wiki
                                 <div class="form-group">
                                     <?php
                                     //check if rating is allowed
-                                    if ($row['ratinglock_disc'] == 1 || api_is_allowed_to_edit(false, true) || api_is_platform_admin()) {
+                                    if (1 == $row['ratinglock_disc'] || api_is_allowed_to_edit(false, true) || api_is_platform_admin()) {
                                         ?>
                                         <label
                                             class="col-sm-2 control-label"><?php echo get_lang('Rating'); ?>:</label>
@@ -4290,7 +4290,7 @@ class Wiki
 
                 echo ' - '.get_lang('Comments on this pageScore').': '.$countWPost_score;
 
-                if ($countWPost_score != 0) {
+                if (0 != $countWPost_score) {
                     $avg_WPost_score = round($row2['sumWPost'] / $countWPost_score, 2).' / 10';
                 } else {
                     $avg_WPost_score = $countWPost_score;
@@ -4310,7 +4310,7 @@ class Wiki
                 echo '<hr noshade size="1">';
                 while ($row = Database::fetch_array($result)) {
                     $userinfo = api_get_user_info($row['userc_id']);
-                    if (($userinfo['status']) == "5") {
+                    if ("5" == ($userinfo['status'])) {
                         $author_status = get_lang('Learner');
                     } else {
                         $author_status = get_lang('Trainer');
@@ -4382,7 +4382,7 @@ class Wiki
                     echo '<tr>';
                     echo '<td rowspan="2">'.$author_photo.'</td>';
                     $userProfile = '';
-                    if ($userinfo !== false) {
+                    if (false !== $userinfo) {
                         $userProfile = UserManager::getUserProfileLink(
                             $userinfo
                         );
@@ -4482,21 +4482,21 @@ class Wiki
                 );
 
                 //get type assignment icon
-                if ($obj->assignment == 1) {
+                if (1 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_assignment.png',
                         get_lang('Assignment proposed by the trainer'),
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($obj->assignment == 2) {
+                } elseif (2 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_work.png',
                         get_lang('Learner paper'),
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($obj->assignment == 0) {
+                } elseif (0 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'px_transparent.gif'
                     );
@@ -4523,7 +4523,7 @@ class Wiki
                         $_GET['session_id']
                     ).'&group_id='.api_htmlentities($_GET['group_id']).'">
                 '.api_htmlentities($obj->title).'</a>';
-                if ($userinfo !== false) {
+                if (false !== $userinfo) {
                     $row[] = UserManager::getUserProfileLink($userinfo);
                 } else {
                     $row[] = get_lang('Anonymous').' ('.api_htmlentities(
@@ -4660,7 +4660,7 @@ class Wiki
         $tbl_wiki_conf = $this->tbl_wiki_conf;
 
         if (api_is_allowed_to_session_edit(false, true)) {
-            if (self::check_notify_all() == 1) {
+            if (1 == self::check_notify_all()) {
                 $notify_all = Display::return_icon(
                         'messagebox_info.png',
                         get_lang('Notify me by e-mail when somebody replies'),
@@ -4714,21 +4714,21 @@ class Wiki
                 $userinfo = api_get_user_info($obj->user_id);
 
                 //get type assignment icon
-                if ($obj->assignment == 1) {
+                if (1 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_assignment.png',
                         get_lang('Assignment proposed by the trainer'),
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($obj->assignment == 2) {
+                } elseif (2 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_work.png',
                         get_lang('Learner paper'),
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($obj->assignment == 0) {
+                } elseif (0 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'px_transparent.gif'
                     );
@@ -4760,7 +4760,7 @@ class Wiki
                 $row[] = $obj->version > 1 ? get_lang('edited by') : get_lang(
                     'added by'
                 );
-                if ($userinfo !== false) {
+                if (false !== $userinfo) {
                     $row[] = UserManager::getUserProfileLink($userinfo);
                 } else {
                     $row[] = get_lang('Anonymous').' ('.api_htmlentities(
@@ -4844,21 +4844,21 @@ class Wiki
 
             //get type assignment icon
             $ShowAssignment = '';
-            if ($row['assignment'] == 1) {
+            if (1 == $row['assignment']) {
                 $ShowAssignment = Display::return_icon(
                     'wiki_assignment.png',
                     get_lang('Assignment proposed by the trainer'),
                     '',
                     ICON_SIZE_SMALL
                 );
-            } elseif ($row['assignment'] == 2) {
+            } elseif (2 == $row['assignment']) {
                 $ShowAssignment = Display::return_icon(
                     'wiki_work.png',
                     get_lang('Learner paper'),
                     '',
                     ICON_SIZE_SMALL
                 );
-            } elseif ($row['assignment'] == 0) {
+            } elseif (0 == $row['assignment']) {
                 $ShowAssignment = Display::return_icon('px_transparent.gif');
             }
 
@@ -4881,7 +4881,7 @@ class Wiki
 
             //fix index to title Main page into linksto
 
-            if ($page == 'index') {
+            if ('index' == $page) {
                 $page = str_replace(' ', '_', get_lang('Home'));
             }
 
@@ -4921,21 +4921,21 @@ class Wiki
                     $seconds = substr($obj->dtime, 17, 2);
 
                     //get type assignment icon
-                    if ($obj->assignment == 1) {
+                    if (1 == $obj->assignment) {
                         $ShowAssignment = Display::return_icon(
                             'wiki_assignment.png',
                             get_lang('Assignment proposed by the trainer'),
                             '',
                             ICON_SIZE_SMALL
                         );
-                    } elseif ($obj->assignment == 2) {
+                    } elseif (2 == $obj->assignment) {
                         $ShowAssignment = Display::return_icon(
                             'wiki_work.png',
                             get_lang('Learner paper'),
                             '',
                             ICON_SIZE_SMALL
                         );
-                    } elseif ($obj->assignment == 0) {
+                    } elseif (0 == $obj->assignment) {
                         $ShowAssignment = Display::return_icon(
                             'px_transparent.gif'
                         );
@@ -4950,7 +4950,7 @@ class Wiki
                             $_GET['session_id']
                         ).'&group_id='.api_htmlentities($_GET['group_id']).'">'.
                         api_htmlentities($obj->title).'</a>';
-                    if ($userinfo !== false) {
+                    if (false !== $userinfo) {
                         $row[] = UserManager::getUserProfileLink($userinfo);
                     } else {
                         $row[] = get_lang('Anonymous').' ('.$obj->user_ip.')';
@@ -5075,7 +5075,7 @@ class Wiki
         $groupfilter = $this->groupfilter;
         $userId = intval($userId);
         $userinfo = api_get_user_info($userId);
-        if ($userinfo !== false) {
+        if (false !== $userinfo) {
             echo '<div class="actions">'.
                 get_lang('Usercontributions').': '.UserManager::getUserProfileLink($userinfo).
                 '<a href="'.api_get_self().'?cidReq='.$_course['code'].'&action=usercontrib&user_id='.$userId.
@@ -5107,21 +5107,21 @@ class Wiki
             while ($obj = Database::fetch_object($allpages)) {
                 //get type assignment icon
                 $ShowAssignment = '';
-                if ($obj->assignment == 1) {
+                if (1 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_assignment.png',
                         get_lang('This page is an assignment proposed by a trainer'),
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($obj->assignment == 2) {
+                } elseif (2 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_work.png',
                         get_lang('Learner paper'),
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($obj->assignment == 0) {
+                } elseif (0 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'px_transparent.gif'
                     );
@@ -5240,21 +5240,21 @@ class Wiki
             while ($obj = Database::fetch_object($allpages)) {
                 //get type assignment icon
                 $ShowAssignment = '';
-                if ($obj->assignment == 1) {
+                if (1 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_assignment.png',
                         get_lang('Assignment proposed by the trainer'),
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($obj->assignment == 2) {
+                } elseif (2 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_work.png',
                         get_lang('Learner paper'),
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($obj->assignment == 0) {
+                } elseif (0 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'px_transparent.gif'
                     );
@@ -5322,11 +5322,11 @@ class Wiki
 
         /* Only teachers and platform admin can edit the index page.
         Only teachers and platform admin can edit an assignment teacher*/
-        if (($current_row['reflink'] == 'index' ||
-                $current_row['reflink'] == '' ||
-                $current_row['assignment'] == 1) &&
+        if (('index' == $current_row['reflink'] ||
+                '' == $current_row['reflink'] ||
+                1 == $current_row['assignment']) &&
             (!api_is_allowed_to_edit(false, true) &&
-                $this->group_id == 0)
+                0 == $this->group_id)
         ) {
             Display::addFlash(
                 Display::return_message(
@@ -5337,7 +5337,7 @@ class Wiki
             );
         } else {
             // check if is a wiki group
-            if ($current_row['group_id'] != 0) {
+            if (0 != $current_row['group_id']) {
                 $groupInfo = GroupManager::get_group_properties(
                     $this->group_id
                 );
@@ -5363,7 +5363,7 @@ class Wiki
 
             // check if is an assignment
             //$icon_assignment = null;
-            if ($current_row['assignment'] == 1) {
+            if (1 == $current_row['assignment']) {
                 Display::addFlash(
                     Display::return_message(
                         get_lang('You can edit this page, but the pages of learners will not be modified'),
@@ -5371,8 +5371,8 @@ class Wiki
                         false
                     )
                 );
-            } elseif ($current_row['assignment'] == 2) {
-                if (($userId == $current_row['user_id']) == false) {
+            } elseif (2 == $current_row['assignment']) {
+                if (false == ($userId == $current_row['user_id'])) {
                     if (api_is_allowed_to_edit(
                             false,
                             true
@@ -5395,9 +5395,9 @@ class Wiki
 
             //show editor if edit is allowed
             if ($PassEdit) {
-                if ($current_row['editlock'] == 1 &&
-                    (api_is_allowed_to_edit(false, true) == false ||
-                        api_is_platform_admin() == false)
+                if (1 == $current_row['editlock'] &&
+                    (false == api_is_allowed_to_edit(false, true) ||
+                        false == api_is_platform_admin())
                 ) {
                     Display::addFlash(
                         Display::return_message(
@@ -5407,7 +5407,7 @@ class Wiki
                         )
                     );
                 } else {
-                    if ($last_row['is_editing'] != 0 && $last_row['is_editing'] != $userId) {
+                    if (0 != $last_row['is_editing'] && $last_row['is_editing'] != $userId) {
                         // Checking for concurrent users
                         $timestamp_edit = strtotime($last_row['time_edit']);
                         $time_editing = time() - $timestamp_edit;
@@ -5557,7 +5557,7 @@ class Wiki
                 ORDER BY reflink ASC';
         $allpages = Database::query($sql);
         while ($row = Database::fetch_array($allpages)) {
-            if ($row['reflink'] == 'index') {
+            if ('index' == $row['reflink']) {
                 $row['reflink'] = str_replace(
                     ' ',
                     '_',
@@ -5592,7 +5592,7 @@ class Wiki
             // Find linksto into reflink. If found ->page is linked
             foreach ($refs as $v) {
                 if (in_array($v, $pages)) {
-                    if (trim($v) != "") {
+                    if ("" != trim($v)) {
                         $linked[] = $v;
                     }
                 }
@@ -5714,21 +5714,21 @@ class Wiki
             while ($row = Database::fetch_array($allpages)) {
                 $orphaned_title = $row['title'];
                 $orphaned_visibility = $row['visibility'];
-                if ($row['assignment'] == 1) {
+                if (1 == $row['assignment']) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_assignment.png',
                         '',
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($row['assignment'] == 2) {
+                } elseif (2 == $row['assignment']) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_work.png',
                         '',
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($row['assignment'] == 0) {
+                } elseif (0 == $row['assignment']) {
                     $ShowAssignment = Display::return_icon(
                         'px_transparent.gif'
                     );
@@ -5736,7 +5736,7 @@ class Wiki
             }
 
             if (!api_is_allowed_to_edit(false, true) || !api_is_platform_admin(
-                ) && $orphaned_visibility == 0) {
+                ) && 0 == $orphaned_visibility) {
                 continue;
             }
 
@@ -5801,7 +5801,7 @@ class Wiki
         $allpages = Database::query($sql);
 
         while ($row = Database::fetch_array($allpages)) {
-            if ($row['reflink'] == 'index') {
+            if ('index' == $row['reflink']) {
                 $row['reflink'] = str_replace(
                     ' ',
                     '_',
@@ -5825,7 +5825,7 @@ class Wiki
             // Find linksto into reflink. If not found ->page is wanted
             foreach ($refs as $v) {
                 if (!in_array($v, $pages)) {
-                    if (trim($v) != "") {
+                    if ("" != trim($v)) {
                         $wanted[] = $v;
                     }
                 }
@@ -5913,21 +5913,21 @@ class Wiki
             while ($obj = Database::fetch_object($allpages)) {
                 //get type assignment icon
                 $ShowAssignment = '';
-                if ($obj->assignment == 1) {
+                if (1 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'wiki_assignment.png',
                         get_lang('Assignment proposed by the trainer'),
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($obj->assignment == 2) {
+                } elseif (2 == $obj->assignment) {
                     $ShowAssignment = $ShowAssignment = Display::return_icon(
                         'wiki_work.png',
                         get_lang('Learner paper'),
                         '',
                         ICON_SIZE_SMALL
                     );
-                } elseif ($obj->assignment == 0) {
+                } elseif (0 == $obj->assignment) {
                     $ShowAssignment = Display::return_icon(
                         'px_transparent.gif'
                     );
@@ -6016,7 +6016,7 @@ class Wiki
 
         if (api_is_allowed_to_edit(false, true) || api_is_platform_admin()) {
             // page action: enable or disable the adding of new pages
-            if (self::check_addnewpagelock() == 0) {
+            if (0 == self::check_addnewpagelock()) {
                 $protect_addnewpage = Display::return_icon(
                     'off.png',
                     get_lang('The Add option has been protected. Trainers only can add pages to this Wiki. But learners and group members can still edit them')
@@ -6101,7 +6101,7 @@ class Wiki
             Display::addFlash(
                 '<div id="wikititle">'.get_lang('Delete this page and all its versions').'</div>'
             );
-            if ($page == "index") {
+            if ("index" == $page) {
                 Display::addFlash(
                     Display::return_message(
                         get_lang('Deleting the homepage of the Wiki is not recommended because it is the main access to the wiki.<br />If, however, you need to do so, do not forget to re-create this Homepage. Until then, other users will not be able to add new pages.'),
@@ -6124,7 +6124,7 @@ class Wiki
                 );
             }
 
-            if (isset($_GET['delete']) && $_GET['delete'] == 'yes') {
+            if (isset($_GET['delete']) && 'yes' == $_GET['delete']) {
                 $result = self::deletePage(
                     $page,
                     $course_id,
@@ -6166,8 +6166,8 @@ class Wiki
         $groupId = $this->group_id;
         $userId = api_get_user_id();
 
-        if (api_get_session_id() != 0 &&
-            api_is_allowed_to_session_edit(false, true) == false
+        if (0 != api_get_session_id() &&
+            false == api_is_allowed_to_session_edit(false, true)
         ) {
             api_not_allowed();
         }
@@ -6184,7 +6184,7 @@ class Wiki
         $row = Database::fetch_array($result);
 
         // we do not need a while loop since we are always displaying the last version
-        if ($row['content'] == '' && $row['title'] == '' && $page == '') {
+        if ('' == $row['content'] && '' == $row['title'] && '' == $page) {
             Display::addFlash(
                 Display::return_message(
                     get_lang('You must select a page first'),
@@ -6194,7 +6194,7 @@ class Wiki
             );
 
             return;
-        } elseif ($row['content'] == '' && $row['title'] == '' && $page == 'index') {
+        } elseif ('' == $row['content'] && '' == $row['title'] && 'index' == $page) {
             // Table structure for better export to pdf
             $default_table_for_content_Start = '<table align="center" border="0"><tr><td align="center">';
             $default_table_for_content_End = '</td></tr></table>';
@@ -6214,11 +6214,11 @@ class Wiki
         // Only teachers and platform admin can edit an assignment teacher.
         // And users in groups
 
-        if (($row['reflink'] == 'index' || $row['reflink'] == '' || $row['assignment'] == 1) &&
+        if (('index' == $row['reflink'] || '' == $row['reflink'] || 1 == $row['assignment']) &&
             (!api_is_allowed_to_edit(
                     false,
                     true
-                ) && $groupId == 0) && !api_is_allowed_in_course()
+                ) && 0 == $groupId) && !api_is_allowed_in_course()
         ) {
             Display::addFlash(
                 Display::return_message(
@@ -6250,7 +6250,7 @@ class Wiki
 
             $icon_assignment = null;
             // check if is a assignment
-            if ($row['assignment'] == 1) {
+            if (1 == $row['assignment']) {
                 Display::addFlash(
                     Display::return_message(get_lang('You can edit this page, but the pages of learners will not be modified'))
                 );
@@ -6261,14 +6261,14 @@ class Wiki
                     '',
                     ICON_SIZE_SMALL
                 );
-            } elseif ($row['assignment'] == 2) {
+            } elseif (2 == $row['assignment']) {
                 $icon_assignment = Display::return_icon(
                     'wiki_work.png',
                     get_lang('Learner paperExtra'),
                     '',
                     ICON_SIZE_SMALL
                 );
-                if (($userId == $row['user_id']) == false) {
+                if (false == ($userId == $row['user_id'])) {
                     if (api_is_allowed_to_edit(
                             false,
                             true
@@ -6290,9 +6290,9 @@ class Wiki
 
             if ($PassEdit) {
                 //show editor if edit is allowed <<<<<
-                if ($row['editlock'] == 1 &&
-                    (api_is_allowed_to_edit(false, true) == false ||
-                        api_is_platform_admin() == false)
+                if (1 == $row['editlock'] &&
+                    (false == api_is_allowed_to_edit(false, true) ||
+                        false == api_is_platform_admin())
                 ) {
                     Display::addFlash(
                         Display::return_message(
@@ -6322,7 +6322,7 @@ class Wiki
 
                     if (!empty($row['enddate_assig']) &&
                         time() > strtotime($row['enddate_assig']) &&
-                        $row['delayedsubmit'] == 0
+                        0 == $row['delayedsubmit']
                     ) {
                         $message = get_lang(
                                 'TheDeadlineHasBeenCompleted'
@@ -6384,19 +6384,19 @@ class Wiki
                             );
                         }
 
-                        if ($row['delayedsubmit'] == 0) {
+                        if (0 == $row['delayedsubmit']) {
                             $message_task_delayedsubmit = get_lang('No');
                         } else {
                             $message_task_delayedsubmit = get_lang('Yes');
                         }
 
-                        if ($row['max_version'] == 0) {
+                        if (0 == $row['max_version']) {
                             $message_task_max_version = get_lang('No');
                         } else {
                             $message_task_max_version = $row['max_version'];
                         }
 
-                        if ($row['max_text'] == 0) {
+                        if (0 == $row['max_text']) {
                             $message_task_max_text = get_lang('No');
                         } else {
                             $message_task_max_text = $row['max_text'];
@@ -6461,7 +6461,7 @@ class Wiki
                     }
 
                     // Previous checking for concurrent editions
-                    if ($row['is_editing'] == 0) {
+                    if (0 == $row['is_editing']) {
                         Display::addFlash(
                             Display::return_message(
                                 get_lang('You have 20 minutes to edit this page. After this time, if you have not saved the page, another user will be able to edit it, and you might lose your changes')
@@ -6480,7 +6480,7 @@ class Wiki
                         $rest_time = $max_edit_time - $time_editing;
 
                         $userinfo = api_get_user_info($row['is_editing']);
-                        if ($userinfo !== false) {
+                        if (false !== $userinfo) {
                             $is_being_edited = get_lang(
                                     'ThisPageisBeginedited by'
                                 ).' '.UserManager::getUserProfileLink(
@@ -6540,7 +6540,7 @@ class Wiki
                             );
                         } elseif (!self::double_post($_POST['wpost_id'])) {
                             //double post
-                        } elseif ($_POST['version'] != '' && $versionFromSession != 0 && $_POST['version'] != $versionFromSession) {
+                        } elseif ('' != $_POST['version'] && 0 != $versionFromSession && $_POST['version'] != $versionFromSession) {
                             //prevent concurrent users and double version
                             Display::addFlash(
                                 Display::return_message(
@@ -6619,14 +6619,14 @@ class Wiki
             $KeyUserId = $row['user_id'];
         }
         $icon_assignment = null;
-        if ($KeyAssignment == 1) {
+        if (1 == $KeyAssignment) {
             $icon_assignment = Display::return_icon(
                 'wiki_assignment.png',
                 get_lang('This page is an assignment proposed by a trainer'),
                 '',
                 ICON_SIZE_SMALL
             );
-        } elseif ($KeyAssignment == 2) {
+        } elseif (2 == $KeyAssignment) {
             $icon_assignment = Display::return_icon(
                 'wiki_work.png',
                 get_lang('Learner paperExtra'),
@@ -6637,11 +6637,11 @@ class Wiki
 
         // Second, show
         //if the page is hidden and is a job only sees its author and professor
-        if ($KeyVisibility == 1 ||
+        if (1 == $KeyVisibility ||
             api_is_allowed_to_edit(false, true) ||
             api_is_platform_admin() ||
             (
-                $KeyAssignment == 2 && $KeyVisibility == 0 &&
+                2 == $KeyAssignment && 0 == $KeyVisibility &&
                 ($userId == $KeyUserId)
             )
         ) {
@@ -6695,10 +6695,10 @@ class Wiki
                     );
 
                     echo '<li style="margin-bottom: 5px;">';
-                    ($counter == 0) ? $oldstyle = 'style="visibility: hidden;"' : $oldstyle = '';
-                    ($counter == 0) ? $newchecked = ' checked' : $newchecked = '';
+                    (0 == $counter) ? $oldstyle = 'style="visibility: hidden;"' : $oldstyle = '';
+                    (0 == $counter) ? $newchecked = ' checked' : $newchecked = '';
                     ($counter == $total_versions - 1) ? $newstyle = 'style="visibility: hidden;"' : $newstyle = '';
-                    ($counter == 1) ? $oldchecked = ' checked' : $oldchecked = '';
+                    (1 == $counter) ? $oldchecked = ' checked' : $oldchecked = '';
                     echo '<input name="old" value="'.$row['id'].'" type="radio" '.$oldstyle.' '.$oldchecked.'/> ';
                     echo '<input name="new" value="'.$row['id'].'" type="radio" '.$newstyle.' '.$newchecked.'/> ';
                     echo '<a href="'.api_get_self(
@@ -6715,7 +6715,7 @@ class Wiki
                     echo '</a>';
                     echo ' ('.get_lang('Version').' '.$row['version'].')';
                     echo ' '.get_lang('By').' ';
-                    if ($userinfo !== false) {
+                    if (false !== $userinfo) {
                         echo UserManager::getUserProfileLink($userinfo);
                     } else {
                         echo get_lang('Anonymous').' ('.api_htmlentities(
@@ -6728,7 +6728,7 @@ class Wiki
                     $comment = $row['comment'];
                     if (!empty($comment)) {
                         $comment = api_substr($comment, 0, 100);
-                        if ($comment !== false) {
+                        if (false !== $comment) {
                             $comment = api_htmlentities($comment);
                             echo get_lang('Comments').': '.$comment;
                             if (api_strlen($row['comment']) > 100) {
@@ -7035,7 +7035,7 @@ class Wiki
                         false,
                         true
                     ) || api_is_platform_admin()) {
-                    if (isset($_GET['delete']) && $_GET['delete'] == 'yes') {
+                    if (isset($_GET['delete']) && 'yes' == $_GET['delete']) {
                         $return_message = self::delete_wiki();
                         Display::addFlash(
                             Display::return_message(
@@ -7055,10 +7055,10 @@ class Wiki
                 self::getLinks($page);
                 break;
             case 'addnew':
-                if (api_get_session_id() != 0 && api_is_allowed_to_session_edit(
+                if (0 != api_get_session_id() && false == api_is_allowed_to_session_edit(
                         false,
                         true
-                    ) == false) {
+                    )) {
                     api_not_allowed();
                 }
                 $groupInfo = GroupManager::get_group_properties(
@@ -7092,11 +7092,11 @@ class Wiki
                             )
                         );
                     }
-                } elseif (self::check_addnewpagelock(
-                    ) == 0 && (api_is_allowed_to_edit(
+                } elseif (0 == self::check_addnewpagelock(
+                    ) && (false == api_is_allowed_to_edit(
                             false,
                             true
-                        ) == false || api_is_platform_admin() == false)) {
+                        ) || false == api_is_platform_admin())) {
                     Display::addFlash(
                         Display::return_message(
                             get_lang('The add option has been temporarily disabled by the trainer'),
@@ -7114,7 +7114,7 @@ class Wiki
                             api_get_user_id(),
                             $groupInfo
                         ) ||
-                        $_GET['group_id'] == 0
+                        0 == $_GET['group_id']
                     ) {
                         self::display_new_wiki_form();
                     } else {
diff --git a/public/main/work/downloadfolder.inc.php b/public/main/work/downloadfolder.inc.php
index 54b845499a..cac826d6e8 100644
--- a/public/main/work/downloadfolder.inc.php
+++ b/public/main/work/downloadfolder.inc.php
@@ -230,7 +230,7 @@ function diff($arr1, $arr2)
     foreach ($arr1 as $av) {
         if (!in_array($av, $arr2)) {
             $res[$r] = $av;
-            ++$r;
+            $r++;
         }
     }
 
diff --git a/public/main/work/student_work.php b/public/main/work/student_work.php
index 49974f0b08..030e584322 100644
--- a/public/main/work/student_work.php
+++ b/public/main/work/student_work.php
@@ -120,9 +120,9 @@ $headers = [
 ];
 foreach ($headers as $header) {
     $table->setHeaderContents($row, $column, $header);
-    ++$column;
+    $column++;
 }
-++$row;
+$row++;
 $column = 0;
 $url = api_get_path(WEB_CODE_PATH).'work/';
 
@@ -136,17 +136,17 @@ foreach ($workPerUser as $work) {
         $itemId = $userResult['id'];
         $table->setCellContents($row, $column, $work->title.' ['.trim(strip_tags($userResult['title'])).']');
         $table->setCellAttributes($row, $column, ['width' => '300px']);
-        ++$column;
+        $column++;
         $table->setCellContents($row, $column, $userResult['sent_date']);
-        ++$column;
+        $column++;
         $dateQualification = !empty($workExtraData['expires_on']) ? api_get_local_time($workExtraData['expires_on']) : '-';
         $table->setCellContents($row, $column, $dateQualification);
-        ++$column;
+        $column++;
 
         $score = null;
         $score = $userResult['qualification'];
         $table->setCellContents($row, $column, $score);
-        ++$column;
+        $column++;
 
         // Detail
         $links = null;
@@ -170,7 +170,7 @@ foreach ($workPerUser as $work) {
 
         $table->setCellContents($row, $column, $links);
 
-        ++$row;
+        $row++;
         $column = 0;
     }
 }
diff --git a/public/main/work/work.lib.php b/public/main/work/work.lib.php
index 08e88725b7..405c26fda4 100644
--- a/public/main/work/work.lib.php
+++ b/public/main/work/work.lib.php
@@ -756,7 +756,7 @@ function create_unexisting_work_directory($workDir, $desiredDirName)
     $workDir = ('/' == substr($workDir, -1, 1) ? $workDir : $workDir.'/');
     $checkDirName = $desiredDirName;
     while (file_exists($workDir.$checkDirName)) {
-        ++$counter;
+        $counter++;
         $checkDirName = $desiredDirName.$counter;
     }
 
@@ -5460,7 +5460,7 @@ function exportAllStudentWorkFromPublication(
                 $column = 0;
                 foreach ($headers as $header) {
                     $table->setHeaderContents(0, $column, $header);
-                    ++$column;
+                    $column++;
                 }
 
                 $row = 1;
@@ -5496,7 +5496,7 @@ function exportAllStudentWorkFromPublication(
                     $table->setCellContents($row, 5, $score);
                     $table->setCellContents($row, 6, $feedback);
 
-                    ++$row;
+                    $row++;
                 }
 
                 $content = $table->toHtml();
diff --git a/public/plugin/advanced_subscription/src/AdvancedSubscriptionPlugin.php b/public/plugin/advanced_subscription/src/AdvancedSubscriptionPlugin.php
index 540a5374ea..ee09a58a32 100644
--- a/public/plugin/advanced_subscription/src/AdvancedSubscriptionPlugin.php
+++ b/public/plugin/advanced_subscription/src/AdvancedSubscriptionPlugin.php
@@ -1544,12 +1544,12 @@ class AdvancedSubscriptionPlugin extends Plugin implements HookPluginInterface
                 if (count($courseCategories) > 0 &&
                     Category::userFinishedCourse($userId, $courseCategories[0])
                 ) {
-                    ++$numberOfApprovedCourses;
+                    $numberOfApprovedCourses++;
                 }
             }
 
             if ($numberOfApprovedCourses === count($courses)) {
-                ++$numberOfApproved;
+                $numberOfApproved++;
             }
         }
 
diff --git a/public/plugin/buycourses/src/buy_course_plugin.class.php b/public/plugin/buycourses/src/buy_course_plugin.class.php
index 2777775779..f2f3f072a3 100644
--- a/public/plugin/buycourses/src/buy_course_plugin.class.php
+++ b/public/plugin/buycourses/src/buy_course_plugin.class.php
@@ -1358,7 +1358,7 @@ class BuyCoursesPlugin extends Plugin
 
         srand((float) microtime() * 1000000);
 
-        for ($i = 0; $i < $length; ++$i) {
+        for ($i = 0; $i < $length; $i++) {
             $numbers = rand(0, strlen($salt) - 1);
             $str .= substr($salt, $numbers, 1);
         }
diff --git a/public/plugin/buycourses/src/buycourses.ajax.php b/public/plugin/buycourses/src/buycourses.ajax.php
index bae8713004..e538e927a8 100644
--- a/public/plugin/buycourses/src/buycourses.ajax.php
+++ b/public/plugin/buycourses/src/buycourses.ajax.php
@@ -167,7 +167,7 @@ switch ($action) {
 
         foreach ($allPays as $payout) {
             $totalPayout += number_format($payout['commission'], 2);
-            ++$totalAccounts;
+            $totalAccounts++;
         }
 
         $currentCurrency = $plugin->getSelectedCurrency();
diff --git a/public/plugin/buycourses/src/panel.ajax.php b/public/plugin/buycourses/src/panel.ajax.php
index 7c0f4131bc..9bc5e857c9 100644
--- a/public/plugin/buycourses/src/panel.ajax.php
+++ b/public/plugin/buycourses/src/panel.ajax.php
@@ -137,7 +137,7 @@ switch ($action) {
 
         foreach ($allPays as $payout) {
             $totalPayout += number_format($payout['commission'], 2);
-            ++$totalAccounts;
+            $totalAccounts++;
         }
 
         $currentCurrency = $plugin->getSelectedCurrency();
diff --git a/public/plugin/buycourses/src/paypalfunctions.php b/public/plugin/buycourses/src/paypalfunctions.php
index b4340260db..e817b1bd12 100644
--- a/public/plugin/buycourses/src/paypalfunctions.php
+++ b/public/plugin/buycourses/src/paypalfunctions.php
@@ -322,7 +322,7 @@ function MassPayment(array $beneficiaries, $currencyCode)
     foreach ($beneficiaries as $beneficiary) {
         $nvpstr .= '&L_EMAIL'.$index.'='.$beneficiary['paypal_account'];
         $nvpstr .= '&L_AMT'.$index.'='.$beneficiary['commission'];
-        ++$index;
+        $index++;
     }
 
     return hash_call('MassPay', $nvpstr);
diff --git a/public/plugin/courselegal/user_list.php b/public/plugin/courselegal/user_list.php
index 5928d0b545..dc58030c94 100644
--- a/public/plugin/courselegal/user_list.php
+++ b/public/plugin/courselegal/user_list.php
@@ -71,7 +71,7 @@ if (!empty($userList)) {
         $table->setCellContents($row, 1, $webDate);
         $table->setCellContents($row, 2, $mailDate);
         $table->setCellContents($row, 3, $link.' '.$deleteLink);
-        ++$row;
+        $row++;
     }
 }
 $url = $pluginPath.'start.php?'.api_get_cidreq();
diff --git a/public/plugin/customcertificate/src/index.php b/public/plugin/customcertificate/src/index.php
index f0e87e7140..f28d2334aa 100644
--- a/public/plugin/customcertificate/src/index.php
+++ b/public/plugin/customcertificate/src/index.php
@@ -894,7 +894,7 @@ $marginOptions = [];
 $i = 0;
 while ($i < 298) {
     $marginOptions[$i] = $i.' mm';
-    ++$i;
+    $i++;
 }
 $form->addElement(
     'select',
diff --git a/public/plugin/customcertificate/src/print_certificate.php b/public/plugin/customcertificate/src/print_certificate.php
index 917c298c4b..4bde4d3dcb 100644
--- a/public/plugin/customcertificate/src/print_certificate.php
+++ b/public/plugin/customcertificate/src/print_certificate.php
@@ -439,7 +439,7 @@ foreach ($userList as $userInfo) {
                         $htmlText .= '</td><td>';
                     }
                     $htmlText .= $value;
-                    ++$i;
+                    $i++;
                 }
                 $htmlText .= '</td>';
                 $htmlText .= '</tr>';
@@ -515,14 +515,14 @@ function getIndexFiltered($index)
     $txt = str_replace(chr(13).chr(10).chr(13).chr(10), chr(13).chr(10), $txt);
     $lines = explode(chr(13).chr(10), $txt);
     $text1 = '';
-    for ($x = 0; $x < 47; ++$x) {
+    for ($x = 0; $x < 47; $x++) {
         if (isset($lines[$x])) {
             $text1 .= $lines[$x].chr(13).chr(10);
         }
     }
 
     $text2 = '';
-    for ($x = 47; $x < 94; ++$x) {
+    for ($x = 47; $x < 94; $x++) {
         if (isset($lines[$x])) {
             $text2 .= $lines[$x].chr(13).chr(10);
         }
diff --git a/public/plugin/dashboard/block_course/block_course.class.php b/public/plugin/dashboard/block_course/block_course.class.php
index 118a19e83c..9afe84c1c3 100644
--- a/public/plugin/dashboard/block_course/block_course.class.php
+++ b/public/plugin/dashboard/block_course/block_course.class.php
@@ -105,7 +105,7 @@ class BlockCourse extends Block
                     $data_table .= '<td align="right">'.$cell.'</td>';
                 }
                 $data_table .= '</tr>';
-                ++$i;
+                $i++;
             }
             $data_table .= '</table>';
         } else {
diff --git a/public/plugin/dashboard/block_daily/block_daily.class.php b/public/plugin/dashboard/block_daily/block_daily.class.php
index 42b4319421..56acc7ab82 100644
--- a/public/plugin/dashboard/block_daily/block_daily.class.php
+++ b/public/plugin/dashboard/block_daily/block_daily.class.php
@@ -114,7 +114,7 @@ class BlockDaily extends Block
                     $data_table .= '<td align="right">'.$cell.'</td>';
                 }
                 $data_table .= '</tr>';
-                ++$i;
+                $i++;
             }
             $data_table .= '</table>';
         } else {
@@ -229,7 +229,7 @@ class BlockDaily extends Block
                         if (count($eval) - 1 != $i) {
                             $score .= ', ';
                         }
-                        ++$i;
+                        $i++;
                     }
                 } else {
                     $score = get_lang('Not available');
diff --git a/public/plugin/dashboard/block_global_info/block_global_info.class.php b/public/plugin/dashboard/block_global_info/block_global_info.class.php
index 16d7031e8d..b66e3408a2 100644
--- a/public/plugin/dashboard/block_global_info/block_global_info.class.php
+++ b/public/plugin/dashboard/block_global_info/block_global_info.class.php
@@ -96,7 +96,7 @@ class BlockGlobalInfo extends Block
                     $data_table .= '<td align="right">'.$cell.'</td>';
                 }
                 $data_table .= '</tr>';
-                ++$i;
+                $i++;
             }
             $data_table .= '</table>';
         } else {
diff --git a/public/plugin/dashboard/block_session/block_session.class.php b/public/plugin/dashboard/block_session/block_session.class.php
index 4716eaee93..be2d359450 100644
--- a/public/plugin/dashboard/block_session/block_session.class.php
+++ b/public/plugin/dashboard/block_session/block_session.class.php
@@ -121,7 +121,7 @@ class BlockSession extends Block
                                         <td align="center">'.$date.'</td>
                                         <td align="center">'.$count_courses_in_session.'</td>
                                    </tr>';
-                ++$i;
+                $i++;
             }
             $sessions_table .= '</table>';
             $content .= $sessions_table;
diff --git a/public/plugin/dashboard/block_student/block_student.class.php b/public/plugin/dashboard/block_student/block_student.class.php
index 0e4217d5a3..7e559ee4d3 100644
--- a/public/plugin/dashboard/block_student/block_student.class.php
+++ b/public/plugin/dashboard/block_student/block_student.class.php
@@ -125,7 +125,7 @@ class BlockStudent extends Block
                                             <td align="center" colspan="2"><i>'.get_lang('You left some fields empty.<br>Use the <b>Back</b> button on your browser and try again.<br>If you ignore your training code, see the Training Program').'</i></td>
                                         </tr>';
                 }
-                ++$i;
+                $i++;
             }
             $students_table .= '</table>';
         } else {
@@ -211,7 +211,7 @@ class BlockStudent extends Block
                                         <td>'.$evaluations_avg.'</td>
                                     </tr>';
 
-                ++$i;
+                $i++;
             }
             $students_table .= '</table>';
         } else {
diff --git a/public/plugin/dashboard/block_teacher/block_teacher.class.php b/public/plugin/dashboard/block_teacher/block_teacher.class.php
index ad3f885f64..1ee616e681 100644
--- a/public/plugin/dashboard/block_teacher/block_teacher.class.php
+++ b/public/plugin/dashboard/block_teacher/block_teacher.class.php
@@ -114,7 +114,7 @@ class BlockTeacher extends Block
                                         <td align="right">'.$last_connection.'</td>
                                     </tr>
                                     ';
-                ++$i;
+                $i++;
             }
             $teachers_table .= '</table>';
         } else {
@@ -171,7 +171,7 @@ class BlockTeacher extends Block
                                         <td align="right">'.$time_on_platform.'</td>
                                     </tr>';
 
-                ++$i;
+                $i++;
             }
             $teachers_table .= '</table>';
         } else {
diff --git a/public/plugin/learning_calendar/LearningCalendarPlugin.php b/public/plugin/learning_calendar/LearningCalendarPlugin.php
index 87b5c38fda..968834ee31 100644
--- a/public/plugin/learning_calendar/LearningCalendarPlugin.php
+++ b/public/plugin/learning_calendar/LearningCalendarPlugin.php
@@ -992,7 +992,7 @@ class LearningCalendarPlugin extends Plugin
         if (Database::num_rows($result)) {
             $row = Database::fetch_array($result, 'ASSOC');
             $currentType = $row['type'];
-            ++$currentType;
+            $currentType++;
             if ($currentType > count($eventTypeList)) {
                 Database::delete(
                     'learning_calendar_events',
diff --git a/public/plugin/learning_calendar/ajax.php b/public/plugin/learning_calendar/ajax.php
index 4e85baf047..2b9f8b3860 100644
--- a/public/plugin/learning_calendar/ajax.php
+++ b/public/plugin/learning_calendar/ajax.php
@@ -28,7 +28,7 @@ switch ($action) {
             $diff = $startDateTime->diff($endDateTime);
             $countDays = $diff->format('%a');
             $dayList[] = $startDate;
-            for ($i = 0; $i < $countDays; ++$i) {
+            for ($i = 0; $i < $countDays; $i++) {
                 $startDateTime->modify('+1 day');
                 $dayList[] = $startDateTime->format('Y-m-d');
             }
diff --git a/public/plugin/questionoptionsevaluation/QuestionOptionsEvaluationPlugin.php b/public/plugin/questionoptionsevaluation/QuestionOptionsEvaluationPlugin.php
index e9eaf908ff..73df99b1f7 100644
--- a/public/plugin/questionoptionsevaluation/QuestionOptionsEvaluationPlugin.php
+++ b/public/plugin/questionoptionsevaluation/QuestionOptionsEvaluationPlugin.php
@@ -174,9 +174,9 @@ class QuestionOptionsEvaluationPlugin extends Plugin
         /** @var TrackEAttempt $qTrack */
         foreach ($qTracks as $qTrack) {
             if ($qTrack->getMarks() > 0) {
-                ++$counts['correct'];
+                $counts['correct']++;
             } elseif ($qTrack->getMarks() < 0) {
-                ++$counts['incorrect'];
+                $counts['incorrect']++;
             }
         }
 
diff --git a/public/plugin/sepe/database.php b/public/plugin/sepe/database.php
index 54c3477b09..4ced15ac92 100644
--- a/public/plugin/sepe/database.php
+++ b/public/plugin/sepe/database.php
@@ -813,7 +813,7 @@ $i = 1;
 foreach ($list_provinces as $value) {
     $sql = "INSERT INTO extra_field_options (field_id, option_value, display_text, option_order) VALUES ('".$field_id."', '".$i."', '".$value."','".$i."');";
     Database::query($sql);
-    ++$i;
+    $i++;
 }
 
 $fieldlabel = 'comunidad_residencia';
@@ -827,7 +827,7 @@ $i = 1;
 foreach ($list_ccaa as $value) {
     $sql = "INSERT INTO extra_field_options (field_id, option_value, display_text, option_order) VALUES ('".$field_id."', '".$i."', '".$value."','".$i."');";
     Database::query($sql);
-    ++$i;
+    $i++;
 }
 
 $fieldlabel = 'provincia_trabajo';
@@ -840,7 +840,7 @@ $i = 1;
 foreach ($list_provinces as $value) {
     $sql = "INSERT INTO extra_field_options (field_id, option_value, display_text, option_order) VALUES ('".$field_id."', '".$i."', '".$value."','".$i."');";
     Database::query($sql);
-    ++$i;
+    $i++;
 }
 
 $fieldlabel = 'comunidad_trabajo';
@@ -853,7 +853,7 @@ $i = 1;
 foreach ($list_ccaa as $value) {
     $sql = "INSERT INTO extra_field_options (field_id, option_value, display_text, option_order) VALUES ('".$field_id."', '".$i."', '".$value."','".$i."');";
     Database::query($sql);
-    ++$i;
+    $i++;
 }
 
 $fieldlabel = 'medio_conocimiento';
diff --git a/public/plugin/sepe/src/formative-action-edit.php b/public/plugin/sepe/src/formative-action-edit.php
index b239964d87..88c68db98a 100644
--- a/public/plugin/sepe/src/formative-action-edit.php
+++ b/public/plugin/sepe/src/formative-action-edit.php
@@ -197,7 +197,7 @@ if (api_is_platform_admin()) {
     $fin_rango_anio = $yearStart + 15 < $yearEnd ? $yearEnd + 1 : $yearStart + 15;
     while ($yearStart <= $fin_rango_anio) {
         $yearList[] = $yearStart;
-        ++$yearStart;
+        $yearStart++;
     }
     $tpl->assign('list_year', $yearList);
     if (isset($_SESSION['sepe_message_info'])) {
diff --git a/public/plugin/sepe/src/participant-specialty-edit.php b/public/plugin/sepe/src/participant-specialty-edit.php
index 24f5b40a8c..7297aaf0ae 100644
--- a/public/plugin/sepe/src/participant-specialty-edit.php
+++ b/public/plugin/sepe/src/participant-specialty-edit.php
@@ -237,7 +237,7 @@ if (api_is_platform_admin()) {
     $endRangeYear = $registrationYear + 15 < $leaveYear ? $leaveYear + 1 : $registrationYear + 15;
     while ($registrationYear <= $endRangeYear) {
         $listYear[] = $registrationYear;
-        ++$registrationYear;
+        $registrationYear++;
     }
     $tpl->assign('list_year', $listYear);
 
@@ -252,7 +252,7 @@ if (api_is_platform_admin()) {
     $endRangeYear = $startYear + 15 < $endYear ? $endYear + 1 : $startYear + 15;
     while ($startYear <= $endRangeYear) {
         $listYear[] = $startYear;
-        ++$startYear;
+        $startYear++;
     }
     $tpl->assign('list_year_2', $listYear);
 
diff --git a/public/plugin/sepe/src/specialty-action-edit.php b/public/plugin/sepe/src/specialty-action-edit.php
index c63016a99f..03450cbdc7 100644
--- a/public/plugin/sepe/src/specialty-action-edit.php
+++ b/public/plugin/sepe/src/specialty-action-edit.php
@@ -220,7 +220,7 @@ if (api_is_platform_admin()) {
     $fin_rango_anio = $yearStart + 15 < $yearEnd ? $yearEnd + 1 : $yearStart + 15;
     while ($yearStart <= $fin_rango_anio) {
         $yearList[] = $yearStart;
-        ++$yearStart;
+        $yearStart++;
     }
     $tpl->assign('list_year', $yearList);
     if (isset($_SESSION['sepe_message_info'])) {
diff --git a/public/plugin/sepe/src/specialty-tutorial-edit.php b/public/plugin/sepe/src/specialty-tutorial-edit.php
index de35c3fc81..77df9b0e57 100644
--- a/public/plugin/sepe/src/specialty-tutorial-edit.php
+++ b/public/plugin/sepe/src/specialty-tutorial-edit.php
@@ -135,7 +135,7 @@ if (api_is_platform_admin()) {
     $endRangeYear = $startYear + 15 < $endYear ? $endYear + 1 : $startYear + 15;
     while ($startYear <= $endRangeYear) {
         $listYears[] = $startYear;
-        ++$startYear;
+        $startYear++;
     }
     $tpl->assign('list_year', $listYears);
 
diff --git a/public/plugin/studentfollowup/my_students.php b/public/plugin/studentfollowup/my_students.php
index aaf74b0ae9..a7633f4275 100644
--- a/public/plugin/studentfollowup/my_students.php
+++ b/public/plugin/studentfollowup/my_students.php
@@ -127,7 +127,7 @@ if (!empty($userList) || $isAdmin) {
         $itemTags = $tag['tags'];
         foreach ($itemTags as $itemTag) {
             if (in_array($itemTag, array_keys($tagList))) {
-                ++$tagList[$itemTag];
+                $tagList[$itemTag]++;
             } else {
                 $tagList[$itemTag] = 1;
             }
@@ -142,7 +142,7 @@ $pagination = '';
 $url = api_get_self().'?session_id='.$sessionId.'&tag='.$selectedTag.'&keyword='.$keyword.'&';
 if ($totalItems > 1 && $pagesCount > 1) {
     $pagination .= '<ul class="pagination">';
-    for ($i = 0; $i < $pagesCount; ++$i) {
+    for ($i = 0; $i < $pagesCount; $i++) {
         $newPage = $i + 1;
         if ($currentPage == $newPage) {
             $pagination .= '<li class="active"><a href="'.$url.'page='.$newPage.'">'.$newPage.'</a></li>';
diff --git a/public/plugin/studentfollowup/posts.php b/public/plugin/studentfollowup/posts.php
index 6dadd02ad3..6d4a1d649b 100644
--- a/public/plugin/studentfollowup/posts.php
+++ b/public/plugin/studentfollowup/posts.php
@@ -55,7 +55,7 @@ $pagination = '';
 $url = api_get_self().'?student_id='.$studentId;
 if ($totalItems > 1) {
     $pagination .= '<ul class="pagination">';
-    for ($i = 0; $i < $pagesCount; ++$i) {
+    for ($i = 0; $i < $pagesCount; $i++) {
         $newPage = $i + 1;
         if ($currentPage == $newPage) {
             $pagination .= '<li class="active"><a href="'.$url.'&page='.$newPage.'">'.$newPage.'</a></li>';
diff --git a/public/plugin/surveyexportcsv/export.php b/public/plugin/surveyexportcsv/export.php
index 7c1f6cf7b6..b74d97bc48 100644
--- a/public/plugin/surveyexportcsv/export.php
+++ b/public/plugin/surveyexportcsv/export.php
@@ -63,7 +63,7 @@ foreach ($surveyAnswers as $answer) {
     array_unshift($row, $i);
 
     $content[] = $row;
-    ++$i;
+    $i++;
 }
 
 // Generate file
diff --git a/public/plugin/surveyexporttxt/export.php b/public/plugin/surveyexporttxt/export.php
index 05159a6f59..f30fca5f23 100644
--- a/public/plugin/surveyexporttxt/export.php
+++ b/public/plugin/surveyexporttxt/export.php
@@ -52,12 +52,12 @@ foreach ($questionsData as $questionData) {
     }
 
     if ('pagebreak' === $questionData['type']) {
-        ++$indexPart;
+        $indexPart++;
 
         continue;
     }
 
-    ++$numberOfQuestions;
+    $numberOfQuestions++;
 
     if (0 === $indexPart) {
         $parts[0][] = $questionData;
@@ -150,7 +150,7 @@ foreach ($surveyAnswers as $answer) {
     }
 
     $content[] = '"'.$i.'","'.$surveyLine;
-    ++$i;
+    $i++;
 }
 
 // Add EOL to lines
diff --git a/public/plugin/test2pdf/src/download-pdf.php b/public/plugin/test2pdf/src/download-pdf.php
index ec2ef2be0b..02d2df35b5 100644
--- a/public/plugin/test2pdf/src/download-pdf.php
+++ b/public/plugin/test2pdf/src/download-pdf.php
@@ -119,7 +119,7 @@ if ('answer' == $_GET['type'] || 'all' == $_GET['type']) {
         if (0 == $i % 4) {
             $pdf->Ln();
         }
-        ++$i;
+        $i++;
     }
 }
 
diff --git a/public/plugin/vchamilo/vcron.php b/public/plugin/vchamilo/vcron.php
index 7b0e67f4e1..294d4b32fc 100644
--- a/public/plugin/vchamilo/vcron.php
+++ b/public/plugin/vchamilo/vcron.php
@@ -128,7 +128,7 @@ function fire_vhost_cron($vhost)
     echo "VCron stop on $vhost->root_web : ".api_time_to_hms($timestamp_receive)."\n#################\n\n";
     $vhost->lastcrongap = time() - $vhost->lastcron;
     $vhost->lastcron = $timestamp_send;
-    ++$vhost->croncount;
+    $vhost->croncount++;
 
     $vhostid = $vhost->id;
     unset($vhost->id);
@@ -168,7 +168,7 @@ function exec_vhost_cron($vhost)
 
     $vhost->lastcrongap = time() - $vhost->lastcron;
     $vhost->lastcron = $timestamp_send;
-    ++$vhost->croncount;
+    $vhost->croncount++;
 
     $DB->update_record('vchamilo', $vhost, 'id');
 }
@@ -286,7 +286,7 @@ if (ROUND_ROBIN == $VCRON->STRATEGY) {
             } else {
                 fire_vhost_cron($vhost);
             }
-            ++$i;
+            $i++;
             if ($i >= $hostsperturn) {
                 return;
             }
diff --git a/public/plugin/vchamilo/views/manage.php b/public/plugin/vchamilo/views/manage.php
index 33cec1c49c..42c0d4834a 100644
--- a/public/plugin/vchamilo/views/manage.php
+++ b/public/plugin/vchamilo/views/manage.php
@@ -96,7 +96,7 @@ foreach ($instances as $instance) {
     ];
     $attrs = ['center' => 'left'];
     $table->addRow($data, $attrs, 'td');
-    ++$i;
+    $i++;
 }
 
 $items = [
diff --git a/public/plugin/whispeakauth/WhispeakAuthPlugin.php b/public/plugin/whispeakauth/WhispeakAuthPlugin.php
index 36d31db560..57b6e5e9e4 100644
--- a/public/plugin/whispeakauth/WhispeakAuthPlugin.php
+++ b/public/plugin/whispeakauth/WhispeakAuthPlugin.php
@@ -204,7 +204,7 @@ class WhispeakAuthPlugin extends Plugin
     {
         $phrases = [];
 
-        for ($i = 1; $i <= 6; ++$i) {
+        for ($i = 1; $i <= 6; $i++) {
             $phrases[] = $this->get_lang("AuthentifySampleText$i");
         }
 
diff --git a/src/CoreBundle/Component/Utils/ChamiloApi.php b/src/CoreBundle/Component/Utils/ChamiloApi.php
index e2ad46e1bb..5443fa6a76 100644
--- a/src/CoreBundle/Component/Utils/ChamiloApi.php
+++ b/src/CoreBundle/Component/Utils/ChamiloApi.php
@@ -324,7 +324,7 @@ class ChamiloApi
         // If we want more colors, loop through existing colors
         $count = count($palette);
         if (isset($fillUpTo) && $fillUpTo > $count) {
-            for ($i = $count; $i < $fillUpTo; ++$i) {
+            for ($i = $count; $i < $fillUpTo; $i++) {
                 $palette[$i] = $palette[$i % $count];
             }
         }
diff --git a/src/CoreBundle/Entity/SkillRelUser.php b/src/CoreBundle/Entity/SkillRelUser.php
index 0e803009ca..48628653f2 100644
--- a/src/CoreBundle/Entity/SkillRelUser.php
+++ b/src/CoreBundle/Entity/SkillRelUser.php
@@ -437,7 +437,7 @@ class SkillRelUser
             }
 
             $sum += $comment->getFeedbackValue();
-            ++$countValues;
+            $countValues++;
         }
 
         $average = $countValues > 0 ? $sum / $countValues : 0;
diff --git a/src/CoreBundle/EventListener/LoginSuccessHandler.php b/src/CoreBundle/EventListener/LoginSuccessHandler.php
index 5fddb00bf2..9e97c13b60 100644
--- a/src/CoreBundle/EventListener/LoginSuccessHandler.php
+++ b/src/CoreBundle/EventListener/LoginSuccessHandler.php
@@ -111,9 +111,9 @@ class LoginSuccessHandler
             foreach ($personal_course_list as $course) {
                 if (!empty($course['session_id'])) {
                     $my_session_list[$course['session_id']] = true;
-                    ++$count_of_courses_with_sessions;
+                    $count_of_courses_with_sessions++;
                 } else {
-                    ++$count_of_courses_no_sessions;
+                    $count_of_courses_no_sessions++;
                 }
             }
 
diff --git a/src/CourseBundle/Component/CourseCopy/CourseRestorer.php b/src/CourseBundle/Component/CourseCopy/CourseRestorer.php
index 587ed00d59..20a7bbebaf 100644
--- a/src/CourseBundle/Component/CourseCopy/CourseRestorer.php
+++ b/src/CourseBundle/Component/CourseCopy/CourseRestorer.php
@@ -617,7 +617,7 @@ class CourseRestorer
                             $new_file_name = $file_name_no_ext.'_'.$i.$ext;
                             $file_exists = file_exists($path.$new_file_name);
                             while ($file_exists) {
-                                ++$i;
+                                $i++;
                                 $new_file_name = $file_name_no_ext.'_'.$i.$ext;
                                 $file_exists = file_exists($path.$new_file_name);
                             }
@@ -644,7 +644,7 @@ class CourseRestorer
                                         $_SESSION['orig_base_foldername'] = $new_base_foldername;
                                         $x = '';
                                         while ($folder_exists) {
-                                            ++$x;
+                                            $x++;
                                             $new_base_foldername = $document_path[1].'_'.$x;
                                             $new_base_path = $orig_base_path.'_'.$x;
                                             if ($_SESSION['new_base_foldername'] == $new_base_foldername) {
@@ -1151,7 +1151,7 @@ class CourseRestorer
                         foreach ($this->course->resources[RESOURCE_FORUMTOPIC] as $topic_id => $topic) {
                             if ($topic->obj->forum_id == $id) {
                                 $this->restore_topic($topic_id, $new_id, $sessionId);
-                                ++$forum_topics;
+                                $forum_topics++;
                             }
                         }
                     }
@@ -1269,7 +1269,7 @@ class CourseRestorer
 
             foreach ($this->course->resources[RESOURCE_FORUMPOST] as $post_id => $post) {
                 if ($post->obj->thread_id == $thread_id) {
-                    ++$topic_replies;
+                    $topic_replies++;
                     $this->restore_post($post_id, $new_id, $forum_id, $sessionId);
                 }
             }
diff --git a/src/CourseBundle/Component/CourseCopy/CourseSelectForm.php b/src/CourseBundle/Component/CourseCopy/CourseSelectForm.php
index 14aad47541..ff7813dadc 100644
--- a/src/CourseBundle/Component/CourseCopy/CourseSelectForm.php
+++ b/src/CourseBundle/Component/CourseCopy/CourseSelectForm.php
@@ -338,21 +338,21 @@ class CourseSelectForm
                         foreach ($resources as $id => $resource) {
                             $forum_categories[$id] = $resource;
                         }
-                        ++$element_count;
+                        $element_count++;
 
                         break;
                     case RESOURCE_FORUM:
                         foreach ($resources as $id => $resource) {
                             $forums[$resource->obj->forum_category][$id] = $resource;
                         }
-                        ++$element_count;
+                        $element_count++;
 
                         break;
                     case RESOURCE_FORUMTOPIC:
                         foreach ($resources as $id => $resource) {
                             $forum_topics[$resource->obj->forum_id][$id] = $resource;
                         }
-                        ++$element_count;
+                        $element_count++;
 
                         break;
                     case RESOURCE_LINKCATEGORY:
@@ -431,7 +431,7 @@ class CourseSelectForm
                             echo '</div>';
                             echo '<script language="javascript">exp('."'$type'".')</script>';
                         }
-                        ++$element_count;
+                        $element_count++;
                 }
             }
         }
diff --git a/src/GraphQlBundle/Resolver/UserResolver.php b/src/GraphQlBundle/Resolver/UserResolver.php
index 355313dfef..d99be69157 100644
--- a/src/GraphQlBundle/Resolver/UserResolver.php
+++ b/src/GraphQlBundle/Resolver/UserResolver.php
@@ -230,7 +230,7 @@ class UserResolver implements ContainerAwareInterface
                     $courseIsVisible = !in_array($course['visibility'], $closedVisibilityList);
 
                     if (false === $courseIsVisible || SESSION_INVISIBLE == $sessionCourseVisibility) {
-                        ++$blockedCourseCount;
+                        $blockedCourseCount++;
                     }
                 }