diff --git a/main/mySpace/myStudents.php b/main/mySpace/myStudents.php
index d20cc4e9e9..726b3acdc6 100755
--- a/main/mySpace/myStudents.php
+++ b/main/mySpace/myStudents.php
@@ -429,7 +429,7 @@ if ($notebookTeacherEnable && !empty($student_id) && !empty($course_code)) {
         Display::return_icon('notebookteacher.png', get_lang('Notebook'), '', ICON_SIZE_MEDIUM).
     '</a>';
 }
-    
+
 if (api_can_login_as($student_id)) {
     echo '<a href="'.api_get_path(WEB_CODE_PATH).'admin/user_list.php?action=login_as&user_id='.$student_id.'&sec_token='.$token.'">'.
         Display::return_icon('login_as.png', get_lang('LoginAs'), null, ICON_SIZE_MEDIUM).'</a>&nbsp;&nbsp;';
diff --git a/plugin/notebookteacher/config.php b/plugin/notebookteacher/config.php
index 92993537b6..b16a08e10a 100644
--- a/plugin/notebookteacher/config.php
+++ b/plugin/notebookteacher/config.php
@@ -7,6 +7,6 @@
  *
  * @author Jose Angel Ruiz <desarrollo@nosolored.com>
  */
-require_once __DIR__ . '/../../main/inc/global.inc.php';
-require_once api_get_path(LIBRARY_PATH) . 'plugin.class.php';
-require_once api_get_path(SYS_PLUGIN_PATH) . 'notebookteacher/src/notebookteacher_plugin.class.php';
+require_once __DIR__.'/../../main/inc/global.inc.php';
+require_once api_get_path(LIBRARY_PATH).'plugin.class.php';
+require_once api_get_path(SYS_PLUGIN_PATH).'notebookteacher/src/notebookteacher_plugin.class.php';
diff --git a/plugin/notebookteacher/database.php b/plugin/notebookteacher/database.php
index 621a20b8e9..af586f334c 100644
--- a/plugin/notebookteacher/database.php
+++ b/plugin/notebookteacher/database.php
@@ -7,7 +7,7 @@
  * @package chamilo.plugin.notebookteacher
  */
 /**
- * Check if script can be called
+ * Check if script can be called.
  */
 if (!function_exists('api_get_path')) {
     die('This script must be loaded through the Chamilo plugin installer sequence');
diff --git a/plugin/notebookteacher/install.php b/plugin/notebookteacher/install.php
index f9a7d6573c..8a9836753b 100644
--- a/plugin/notebookteacher/install.php
+++ b/plugin/notebookteacher/install.php
@@ -7,9 +7,9 @@
  * @package chamilo.plugin.notebookteacher
  */
 /**
- * Initialization
+ * Initialization.
  */
-require_once __DIR__ . '/config.php';
+require_once __DIR__.'/config.php';
 if (!api_is_platform_admin()) {
     die('You must have admin permissions to install plugins');
 }
diff --git a/plugin/notebookteacher/lang/english.php b/plugin/notebookteacher/lang/english.php
index 8086d55b89..f3f8200432 100644
--- a/plugin/notebookteacher/lang/english.php
+++ b/plugin/notebookteacher/lang/english.php
@@ -1,6 +1,7 @@
 <?php
 $strings['plugin_title'] = "Teacher notes";
-$strings['plugin_comment'] = "This plugin allows the teachers of a course to have a shared notebook. Students do not have access.";
+$strings['plugin_comment'] = "This plugin allows the teachers of a course to have a shared notebook.
+                              Students do not have access.";
 $strings['NotebookTeacher'] = "Teacher notes";
 $strings['enable_plugin_notebookteacher'] = "Enable plugin";
 $strings['ToolDisabled'] = "The tool is disabled from the administration";
diff --git a/plugin/notebookteacher/lang/spanish.php b/plugin/notebookteacher/lang/spanish.php
index daf7bd3391..796683ad91 100644
--- a/plugin/notebookteacher/lang/spanish.php
+++ b/plugin/notebookteacher/lang/spanish.php
@@ -1,6 +1,7 @@
 <?php
 $strings['plugin_title'] = "Notas profesores";
-$strings['plugin_comment'] = "Este plugin permite a los profesores de un curso tener un bloc de notas compartido. Alumnos no tienen acceso.";
+$strings['plugin_comment'] = "Este plugin permite a los profesores de un curso tener un bloc de notas compartido.
+                              Alumnos no tienen acceso.";
 $strings['NotebookTeacher'] = "Notas profesores";
 $strings['enable_plugin_notebookteacher'] = "Activar plugin";
 $strings['ToolDisabled'] = "La herramienta está deshabilitada desde la administración";
diff --git a/plugin/notebookteacher/plugin.php b/plugin/notebookteacher/plugin.php
index 2196560c5a..d1a9bcb468 100644
--- a/plugin/notebookteacher/plugin.php
+++ b/plugin/notebookteacher/plugin.php
@@ -8,7 +8,7 @@
  * @package chamilo.plugin.notebookteacher
  */
 /**
- * Plugin details (must be present)
+ * Plugin details (must be present).
  */
-require_once __DIR__ . '/config.php';
+require_once __DIR__.'/config.php';
 $plugin_info = NotebookTeacherPlugin::create()->get_info();
diff --git a/plugin/notebookteacher/src/index.php b/plugin/notebookteacher/src/index.php
index 9f3e34c33a..7091f95741 100644
--- a/plugin/notebookteacher/src/index.php
+++ b/plugin/notebookteacher/src/index.php
@@ -21,7 +21,7 @@ if ($enable) {
         $location = 'index.php?'.api_get_cidreq();
 
         // Additional javascript
-        $htmlHeadXtra[] = NotebookTeacher::javascript_notebook();
+        $htmlHeadXtra[] = NotebookTeacher::javascriptNotebook();
         $htmlHeadXtra[] = '<script>
         function setFocus(){
             $("#note_title").focus();
@@ -47,11 +47,17 @@ if ($enable) {
         // Tool name
         if ($action === 'addnote') {
             $tool = 'NoteAddNew';
-            $interbreadcrumb[] = ['url' => 'index.php?'.api_get_cidreq(), 'name' => $plugin->get_lang('NotebookTeacher')];
+            $interbreadcrumb[] = [
+                'url' => 'index.php?'.api_get_cidreq(),
+                'name' => $plugin->get_lang('NotebookTeacher'),
+            ];
         }
         if ($action === 'editnote') {
             $tool = 'ModifyNote';
-            $interbreadcrumb[] = ['url' => 'index.php?'.api_get_cidreq(), 'name' => $plugin->get_lang('NotebookTeacher')];
+            $interbreadcrumb[] = [
+                'url' => 'index.php?'.api_get_cidreq(),
+                'name' => $plugin->get_lang('NotebookTeacher')
+            ];
         }
 
         // Displaying the header
@@ -112,9 +118,9 @@ if ($enable) {
                 } else {
                     $sql .= " AND session_course_user.status = 0 ";
                 }
-                $sql .= $sort_by_first_name ? 
-                        ' ORDER BY user.firstname, user.lastname' : 
-                        ' ORDER BY user.lastname, user.firstname';
+                $sql .= $sort_by_first_name
+                        ? ' ORDER BY user.firstname, user.lastname'
+                        : ' ORDER BY user.lastname, user.firstname';
 
                 $rs = Database::query($sql);
 
@@ -174,13 +180,13 @@ if ($enable) {
                 $check = Security::check_token('post');
                 if ($check) {
                     $values = $form->exportValues();
-                    $res = NotebookTeacher::save_note($values);
+                    $res = NotebookTeacher::saveNote($values);
                     if ($res) {
                         echo Display::return_message(get_lang('NoteAdded'), 'confirmation');
                     }
                 }
                 Security::clear_token();
-                NotebookTeacher::display_notes();
+                NotebookTeacher::displayNotes();
             } else {
                 echo '<div class="actions">';
                 echo '<a href="index.php">'.
@@ -195,7 +201,7 @@ if ($enable) {
         } elseif ($action === 'editnote' && is_numeric($_GET['notebook_id'])) {
             // Action handling: Editing a note
             if (!empty($_GET['isStudentView']) || api_is_drh()) {
-                NotebookTeacher::display_notes();
+                NotebookTeacher::displayNotes();
                 exit;
             }
 
@@ -246,7 +252,7 @@ if ($enable) {
                 } else {
                     $sql .= " AND session_course_user.status = 0 ";
                 }
-                $sql .= $sort_by_first_name 
+                $sql .= $sort_by_first_name
                         ? ' ORDER BY user.firstname, user.lastname'
                         : ' ORDER BY user.lastname, user.firstname';
 
@@ -301,7 +307,7 @@ if ($enable) {
             $form->addButtonUpdate(get_lang('ModifyNote'), 'SubmitNote');
 
             // Setting the defaults
-            $defaults = NotebookTeacher::get_note_information(Security::remove_XSS($_GET['notebook_id']));
+            $defaults = NotebookTeacher::getNoteInformation(Security::remove_XSS($_GET['notebook_id']));
             $form->setDefaults($defaults);
 
             // Setting the rules
@@ -312,13 +318,13 @@ if ($enable) {
                 $check = Security::check_token('post');
                 if ($check) {
                     $values = $form->exportValues();
-                    $res = NotebookTeacher::update_note($values);
+                    $res = NotebookTeacher::updateNote($values);
                     if ($res) {
                         echo Display::return_message(get_lang('NoteUpdated'), 'confirmation');
                     }
                 }
                 Security::clear_token();
-                NotebookTeacher::display_notes();
+                NotebookTeacher::displayNotes();
             } else {
                 echo '<div class="actions">';
                 echo '<a href="index.php">'.
@@ -331,12 +337,12 @@ if ($enable) {
             }
         } elseif ($action === 'deletenote' && is_numeric($_GET['notebook_id'])) {
             // Action handling: deleting a note
-            $res = NotebookTeacher::delete_note($_GET['notebook_id']);
+            $res = NotebookTeacher::deleteNote($_GET['notebook_id']);
             if ($res) {
                 echo Display::return_message(get_lang('NoteDeleted'), 'confirmation');
             }
 
-            NotebookTeacher::display_notes();
+            NotebookTeacher::displayNotes();
         } elseif (
             $action === 'changeview' && in_array($_GET['view'], ['creation_date', 'update_date', 'title'])) {
 
@@ -365,9 +371,9 @@ if ($enable) {
                     break;
             }
             $_SESSION['notebook_view'] = $_GET['view'];
-            NotebookTeacher::display_notes();
+            NotebookTeacher::displayNotes();
         } else {
-            NotebookTeacher::display_notes();
+            NotebookTeacher::displayNotes();
         }
         
         Display::display_footer();
@@ -383,7 +389,7 @@ if ($enable) {
             Display::return_message($plugin->get_lang('ToolForTeacher'))
         );
 
-        header('Location: ' . $url);
+        header('Location: '.$url);
     }
 } else {
     echo $plugin->get_lang('ToolDisabled');
diff --git a/plugin/notebookteacher/src/notebookteacher.lib.php b/plugin/notebookteacher/src/notebookteacher.lib.php
index ab340e5145..9189a43dec 100644
--- a/plugin/notebookteacher/src/notebookteacher.lib.php
+++ b/plugin/notebookteacher/src/notebookteacher.lib.php
@@ -1,5 +1,7 @@
 <?php
 /* For licensing terms, see /license.txt */
+
+use ChamiloSession as Session;
 require_once __DIR__.'/../config.php';
 /**
  * This class provides methods for the notebook management.
@@ -13,27 +15,27 @@ require_once __DIR__.'/../config.php';
 class NotebookTeacher
 {
     /**
-     * Constructor
+     * Constructor.
      */
     public function __construct()
     {
     }
 
     /**
-     * a little bit of javascript to display a prettier warning when deleting a note
+     * a little bit of javascript to display a prettier warning when deleting a note.
      *
      * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
      *
      * @version januari 2009, dokeos 1.8.6
-     *     
+     *
      * @return string
      */
-    public static function javascript_notebook()
+    public static function javascriptNotebook()
     {
         return "<script>
 				function confirmation (name)
 				{
-					if (confirm(\" " . get_lang("NoteConfirmDelete")." \"+ name + \" ?\"))
+					if (confirm(\" ".get_lang("NoteConfirmDelete")." \"+ name + \" ?\"))
 						{return true;}
 					else
 						{return false;}
@@ -42,16 +44,16 @@ class NotebookTeacher
     }
 
     /**
-     * This functions stores the note in the database
+     * This functions stores the note in the database.
      *
      * @param array $values
-     * @param int $userId Optional. The user ID
-     * @param int $courseId Optional. The course ID
-     * @param int $sessionId Optional. The session ID
+     * @param int   $userId    Optional. The user ID
++    * @param int   $courseId  Optional. The course ID
++    * @param int   $sessionId Optional. The session ID
      *
      * @return bool
      */
-    public static function save_note($values, $userId = 0, $courseId = 0, $sessionId = 0)
+    public static function saveNote($values, $userId = 0, $courseId = 0, $sessionId = 0)
     {
         if (!is_array($values) || empty($values['note_title'])) {
             return false;
@@ -85,13 +87,13 @@ class NotebookTeacher
     }
 
     /**
-     * @param int $notebook_id
+     * @param int $notebookId
      *
      * @return array|mixed
      */
-    public static function get_note_information($notebook_id)
+    public static function getNoteInformation($notebookId)
     {
-        if (empty($notebook_id)) {
+        if (empty($notebookId)) {
             return [];
         }
 
@@ -106,7 +108,7 @@ class NotebookTeacher
                 session_id AS session_id,
                 student_id AS student_id
                FROM $tableNotebook
-               WHERE c_id = $courseId AND id = '".intval($notebook_id)."' ";
+               WHERE c_id = $courseId AND id = '".intval($notebookId)."' ";
         $result = Database::query($sql);
         if (Database::num_rows($result) != 1) {
             return [];
@@ -121,7 +123,7 @@ class NotebookTeacher
      *
      * @return bool
      */
-    public static function update_note($values)
+    public static function updateNote($values)
     {
         if (!is_array($values) or empty($values['note_title'])) {
             return false;
@@ -139,7 +141,7 @@ class NotebookTeacher
             'session_id' => $sessionId,
             'title' => $values['note_title'],
             'description' => $values['note_comment'],
-            'update_date' => api_get_utc_datetime()
+            'update_date' => api_get_utc_datetime(),
         ];
 
         Database::update(
@@ -148,7 +150,7 @@ class NotebookTeacher
             [
                 'c_id = ? AND id = ?' => [
                     $courseId,
-                    $values['notebook_id']
+                    $values['notebook_id'],
                 ],
             ]
         );
@@ -156,13 +158,13 @@ class NotebookTeacher
     }
 
     /**
-     * @param int $notebook_id
+     * @param int $notebookId
      *
      * @return bool
      */
-    public static function delete_note($notebook_id)
+    public static function deleteNote($notebookId)
     {
-        if (empty($notebook_id) || $notebook_id != strval(intval($notebook_id))) {
+        if (empty($notebookId) || $notebookId != strval(intval($notebookId))) {
             return false;
         }
 
@@ -174,8 +176,8 @@ class NotebookTeacher
         $sql = "DELETE FROM $tableNotebook
                 WHERE
                     c_id = $courseId AND
-                    id = '".intval($notebook_id)."' AND
-                    user_id = '" . api_get_user_id()."'";
+                    id = '".intval($notebookId)."' AND
+                    user_id = '".api_get_user_id()."'";
         $result = Database::query($sql);
 
         if (Database::affected_rows($result) != 1) {
@@ -187,14 +189,14 @@ class NotebookTeacher
     /**
      * Display notes.
      */
-    public static function display_notes()
+    public static function displayNotes()
     {
         $plugin = NotebookTeacherPlugin::create();
-        $_user = api_get_user_info();
+        $userInfo = api_get_user_info();
         if (!isset($_GET['direction'])) {
             $sortDirection = 'ASC';
             $linkSortDirection = 'DESC';
-        } elseif ($_GET['direction'] == 'ASC') {
+        } else if ($_GET['direction'] == 'ASC') {
             $sortDirection = 'ASC';
             $linkSortDirection = 'DESC';
         } else {
@@ -212,12 +214,16 @@ class NotebookTeacher
         $courseId = $courseInfo['real_id'];
         $currentAccessUrlId = api_get_current_access_url_id();
         $sortByfirstName = api_sort_by_first_name();
+        $type = isset($_REQUEST['type']) ? intval($_REQUEST['type']) : STUDENT;
 
         if (!empty($sessionId)) {
             $tableSessionCourseUser = Database::get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
             $tableUsers = Database::get_main_table(TABLE_MAIN_USER);
+            $isWesternNameOrder = api_is_western_name_order();
             $sql = "SELECT DISTINCT
-                        user.user_id, ".($is_western_name_order ? "user.firstname, user.lastname" : "user.lastname, user.firstname")."
+                        user.user_id, ".($isWesternNameOrder
+                                ? "user.firstname, user.lastname"
+                                : "user.lastname, user.firstname")."
                     FROM $tableSessionCourseUser as session_course_user,
             $tableUsers as user ";
             if (api_is_multiple_url_enabled()) {
@@ -236,7 +242,9 @@ class NotebookTeacher
             } else {
                 $sql .= " AND session_course_user.status = 0 ";
             }
-            $sql .= $sortByfirstName ? ' ORDER BY user.firstname, user.lastname' : ' ORDER BY user.lastname, user.firstname';
+            $sql .= $sortByfirstName 
+                    ? ' ORDER BY user.firstname, user.lastname'
+                    : ' ORDER BY user.lastname, user.firstname';
 
             $rs = Database::query($sql);
 
@@ -307,11 +315,17 @@ class NotebookTeacher
             }
         }
 
-        echo '<a href="index.php?'.api_get_cidreq().'&action=changeview&view=creation_date&direction='.$linkSortDirection.'&student_id='.$studentId.'">'.
+        echo '<a href="index.php?'.
+                api_get_cidreq().
+                '&action=changeview&view=creation_date&direction='.$linkSortDirection.'&student_id='.$studentId.'">'.
             Display::return_icon('notes_order_by_date_new.png', get_lang('OrderByCreationDate'), '', '32').'</a>';
-        echo '<a href="index.php?'.api_get_cidreq().'&action=changeview&view=update_date&direction='.$linkSortDirection.'&student_id='.$studentId.'">'.
+        echo '<a href="index.php?'.
+                api_get_cidreq().
+                '&action=changeview&view=update_date&direction='.$linkSortDirection.'&student_id='.$studentId.'">'.
             Display::return_icon('notes_order_by_date_mod.png', get_lang('OrderByModificationDate'), '', '32').'</a>';
-        echo '<a href="index.php?'.api_get_cidreq().'&action=changeview&view=title&direction='.$linkSortDirection.'&student_id='.$studentId.'">'.
+        echo '<a href="index.php?'.
+                api_get_cidreq().
+                '&action=changeview&view=title&direction='.$linkSortDirection.'&student_id='.$studentId.'">'.
             Display::return_icon('notes_order_by_title.png', get_lang('OrderByTitle'), '', '32').'</a>';
 
         echo '</div>';
@@ -364,18 +378,24 @@ class NotebookTeacher
                         $first = false;
                     }
                     // Validation when belongs to a session
-                    $sessionImg = api_get_session_image($row['session_id'], $_user['status']);
+                    $sessionImg = api_get_session_image($row['session_id'], $userInfo['status']);
                     $updateValue = '';
-                    if ($row['update_date'] <> $row['creation_date']) {
-                        $updateValue = ', '.get_lang('UpdateDate').': '.Display::dateToStringAgoAndLongDate($row['update_date']);
+                    if ($row['update_date'] != $row['creation_date']) {
+                        $updateValue = ', '.get_lang('UpdateDate').': '.
+                                        Display::dateToStringAgoAndLongDate($row['update_date']);
                     }
                     $userInfo = api_get_user_info($row['user_id']);
                     $author = ', '.get_lang('Teacher').': '.$userInfo['complete_name'];
 
                     if (intval($row['user_id']) == api_get_user_id()) {
-                        $actions = '<a href="'.api_get_self().'?'.api_get_cidreq().'action=editnote&notebook_id='.$row['id'].'">'.
+                        $actions = '<a href="'.
+                                api_get_self().'?'.
+                                api_get_cidreq().'action=editnote&notebook_id='.$row['id'].'">'.
                                 Display::return_icon('edit.png', get_lang('Edit'), '', ICON_SIZE_SMALL).'</a>';
-                        $actions .= '<a href="'.api_get_self().'?action=deletenote&notebook_id='.$row['id'].'" onclick="return confirmation(\''.$row['title'].'\');">'.
+                        $actions .= '<a href="'.
+                                api_get_self().
+                                '?action=deletenote&notebook_id='.$row['id'].
+                                '" onclick="return confirmation(\''.$row['title'].'\');">'.
                                 Display::return_icon('delete.png', get_lang('Delete'), '', ICON_SIZE_SMALL).'</a>';
                     } else {
                         $actions = '';
@@ -384,7 +404,8 @@ class NotebookTeacher
                     echo Display::panel(
                             $row['description'],
                             $row['title'].$sessionImg.' <div class="pull-right">'.$actions.'</div>',
-                            get_lang('CreationDate').': '.Display::dateToStringAgoAndLongDate($row['creation_date']).$updateValue.$author
+                            get_lang('CreationDate').': '.
+                            Display::dateToStringAgoAndLongDate($row['creation_date']).$updateValue.$author
                     );
                 }
             } else {
@@ -412,21 +433,30 @@ class NotebookTeacher
                     while ($row = Database::fetch_array($result)) {
 
                         // Validation when belongs to a session
-                        $sessionImg = api_get_session_image($row['session_id'], $_user['status']);
+                        $sessionImg = api_get_session_image($row['session_id'], $userInfo['status']);
                         $updateValue = '';
 
-                        if ($row['update_date'] <> $row['creation_date']) {
-                            $updateValue = ', '.get_lang('UpdateDate').': '.Display::dateToStringAgoAndLongDate($row['update_date']);
+                        if ($row['update_date'] != $row['creation_date']) {
+                            $updateValue = ', '.get_lang('UpdateDate').': '.
+                            Display::dateToStringAgoAndLongDate($row['update_date']);
                         }
 
                         $userInfo = api_get_user_info($row['user_id']);
                         $author = ', '.get_lang('Teacher').': '.$userInfo['complete_name'];
 
                         if (intval($row['user_id']) == api_get_user_id()) {
-                            $actions = '<a href="'.api_get_self().'?action=editnote&notebook_id='.$row['id'].'&'.api_get_cidreq().'">'.
+                            $actions = '<a href="'.api_get_self().
+                                    '?action=editnote&notebook_id='.$row['id'].'&'.api_get_cidreq().'">'.
                                     Display::return_icon('edit.png', get_lang('Edit'), '', ICON_SIZE_SMALL).'</a>';
-                            $actions .= '<a href="'.api_get_self().'?action=deletenote&notebook_id='.$row['id'].'" onclick="return confirmation(\''.$row['title'].'\');">'.
-                                    Display::return_icon('delete.png', get_lang('Delete'), '', ICON_SIZE_SMALL).'</a>';
+                            $actions .= '<a href="'.api_get_self().
+                                    '?action=deletenote&notebook_id='.$row['id'].
+                                    '" onclick="return confirmation(\''.$row['title'].'\');">'.
+                                    Display::return_icon(
+                                            'delete.png',
+                                            get_lang('Delete'),
+                                            '',
+                                            ICON_SIZE_SMALL
+                                    ).'</a>';
                         } else {
                             $actions = '';
                         }
@@ -434,7 +464,8 @@ class NotebookTeacher
                         echo Display::panel(
                                 $row['description'],
                                 $row['title'].$sessionImg.' <div class="pull-right">'.$actions.'</div>',
-                                get_lang('CreationDate').': '.Display::dateToStringAgoAndLongDate($row['creation_date']).$updateValue.$author
+                                get_lang('CreationDate').': '.
+                                Display::dateToStringAgoAndLongDate($row['creation_date']).$updateValue.$author
                         );
                     }
                 }
@@ -456,20 +487,24 @@ class NotebookTeacher
                 while ($row = Database::fetch_array($result)) {
 
                     // Validation when belongs to a session
-                    $sessionImg = api_get_session_image($row['session_id'], $_user['status']);
+                    $sessionImg = api_get_session_image($row['session_id'], $userInfo['status']);
                     $updateValue = '';
 
-                    if ($row['update_date'] <> $row['creation_date']) {
-                        $updateValue = ', '.get_lang('UpdateDate').': '.Display::dateToStringAgoAndLongDate($row['update_date']);
+                    if ($row['update_date'] != $row['creation_date']) {
+                        $updateValue = ', '.get_lang('UpdateDate').': '.
+                        Display::dateToStringAgoAndLongDate($row['update_date']);
                     }
 
                     $userInfo = api_get_user_info($row['user_id']);
                     $author = ', '.get_lang('Teacher').': '.$userInfo['complete_name'];
 
                     if (intval($row['user_id']) == api_get_user_id()) {
-                        $actions = '<a href="'.api_get_self().'?action=editnote&notebook_id='.$row['id'].'&'.api_get_cidreq().'">'.
+                        $actions = '<a href="'.api_get_self().
+                                '?action=editnote&notebook_id='.$row['id'].'&'.api_get_cidreq().'">'.
                                 Display::return_icon('edit.png', get_lang('Edit'), '', ICON_SIZE_SMALL).'</a>';
-                        $actions .= '<a href="'.api_get_self().'?action=deletenote&notebook_id='.$row['id'].'" onclick="return confirmation(\''.$row['title'].'\');">'.
+                        $actions .= '<a href="'.api_get_self().
+                                '?action=deletenote&notebook_id='.$row['id'].
+                                '" onclick="return confirmation(\''.$row['title'].'\');">'.
                                 Display::return_icon('delete.png', get_lang('Delete'), '', ICON_SIZE_SMALL).'</a>';
                     } else {
                         $actions = '';
@@ -478,7 +513,8 @@ class NotebookTeacher
                     echo Display::panel(
                             $row['description'],
                             $row['title'].$sessionImg.' <div class="pull-right">'.$actions.'</div>',
-                            get_lang('CreationDate').': '.Display::dateToStringAgoAndLongDate($row['creation_date']).$updateValue.$author
+                            get_lang('CreationDate').': '.
+                            Display::dateToStringAgoAndLongDate($row['creation_date']).$updateValue.$author
                     );
                 }
             }
diff --git a/plugin/notebookteacher/src/notebookteacher_plugin.class.php b/plugin/notebookteacher/src/notebookteacher_plugin.class.php
index 20b1df6154..310d8340fd 100644
--- a/plugin/notebookteacher/src/notebookteacher_plugin.class.php
+++ b/plugin/notebookteacher/src/notebookteacher_plugin.class.php
@@ -29,7 +29,6 @@ class NotebookTeacherPlugin extends Plugin
     }
 
     /**
-     *
      * @return StaticPlugin
      */
     public static function create()
@@ -48,7 +47,7 @@ class NotebookTeacherPlugin extends Plugin
         $this->install_course_fields_in_all_courses();
 
         $tablesToBeCompared = [
-                self::TABLE_NOTEBOOKTEACHER
+                self::TABLE_NOTEBOOKTEACHER,
         ];
         $em = Database::getManager();
         $cn = $em->getConnection();
@@ -72,7 +71,7 @@ class NotebookTeacherPlugin extends Plugin
         copy($srcfile3, $dstfile3);
         copy($srcfile4, $dstfile4);
 
-        require_once api_get_path(SYS_PLUGIN_PATH) . 'notebookteacher/database.php';
+        require_once api_get_path(SYS_PLUGIN_PATH).'notebookteacher/database.php';
     }
 
     /**
@@ -84,11 +83,11 @@ class NotebookTeacherPlugin extends Plugin
         $this->uninstall_course_fields_in_all_courses($this->course_settings);
 
         $tablesToBeDeleted = [
-            TABLE_NOTEBOOKTEACHER
+            TABLE_NOTEBOOKTEACHER,
         ];
         foreach ($tablesToBeDeleted as $tableToBeDeleted) {
             $table = Database::get_main_table($tableToBeDeleted);
-            $sql = "DROP TABLE IF EXISTS $tableToBeDeleted";
+            $sql = "DROP TABLE IF EXISTS $table";
             Database::query($sql);
         }
         $this->manageTab(false);
@@ -118,7 +117,7 @@ class NotebookTeacherPlugin extends Plugin
         copy($srcfile3, $dstfile3);
         copy($srcfile4, $dstfile4);
 
-        Display::display_header(get_lang(ucfirst($tool)));
+        Display::display_header(get_lang(ucfirst(self::TABLE_NOTEBOOKTEACHER)));
         echo 'Plugin actualizado';
         Display::display_footer();
     }
diff --git a/plugin/notebookteacher/start.php b/plugin/notebookteacher/start.php
index d5d5860138..80512f0adf 100644
--- a/plugin/notebookteacher/start.php
+++ b/plugin/notebookteacher/start.php
@@ -14,7 +14,7 @@ $enable = $plugin->get('enable_plugin_notebookteacher') == 'true';
 if ($enable) {
     if (api_is_teacher() || api_is_drh()) {
         $url = 'src/index.php?'.api_get_cidreq();
-        header('Location: ' . $url);
+        header('Location: '.$url);
         exit;
     } else {
         /** @var \Chamilo\CoreBundle\Entity\Session $session */
@@ -28,7 +28,7 @@ if ($enable) {
             Display::return_message($plugin->get_lang('ToolForTeacher'))
         );
 
-        header('Location: ' . $url);
+        header('Location: '.$url);
     }
 } else {
     echo $plugin->get_lang('ToolDisabled');
diff --git a/plugin/notebookteacher/uninstall.php b/plugin/notebookteacher/uninstall.php
index 20eceac6eb..acf873f7d7 100644
--- a/plugin/notebookteacher/uninstall.php
+++ b/plugin/notebookteacher/uninstall.php
@@ -8,7 +8,7 @@
  * @package chamilo.plugin.notebookteacher
  */
 /**
- * Queries
+ * Queries.
  */
-require_once __DIR__ . '/config.php';
+require_once __DIR__.'/config.php';
 NotebookTeacherPlugin::create()->uninstall();
diff --git a/plugin/notebookteacher/update.php b/plugin/notebookteacher/update.php
index 4cce72a3c0..0d48b17c3e 100644
--- a/plugin/notebookteacher/update.php
+++ b/plugin/notebookteacher/update.php
@@ -7,7 +7,7 @@
  * @package chamilo.plugin.notebookteacher
  */
 /**
- * Initialization
+ * Initialization.
  */
 require_once __DIR__ . '/config.php';
 if (!api_is_platform_admin()) {