diff --git a/main/lp/learnpath.class.php b/main/lp/learnpath.class.php
index 7474e6faa9..3517390b67 100755
--- a/main/lp/learnpath.class.php
+++ b/main/lp/learnpath.class.php
@@ -1588,31 +1588,6 @@ class learnpath
         return true;
     }
 
-    /**
-     * Static admin function exporting a learnpath into a zip file
-     * @param    string    Export type (scorm, zip, cd)
-     * @param    string    Course code
-     * @param    integer Learnpath ID
-     * @param    string    Zip file name
-     * @return   string    Zip file path (or false on error)
-     */
-    public function export_lp($type, $course, $id, $zipname)
-    {
-        if (empty($type) || empty($course) || empty($id) || empty($zipname)) {
-            return false;
-        }
-        $url = '';
-        switch ($type) {
-            case 'scorm':
-                break;
-            case 'zip':
-                break;
-            case 'cdrom':
-                break;
-        }
-        return $url;
-    }
-
     /**
      * Gets all the chapters belonging to the same parent as the item/chapter given
      * Can also be called as abstract method
@@ -1814,8 +1789,7 @@ class learnpath
     }
 
     /**
-     * Gets the first element URL.
-     * @return    string    URL to load into the viewer
+    *  Sets the first element URL.
      */
     public function first()
     {
@@ -2835,7 +2809,11 @@ class learnpath
                 foreach ($ids as $id) {
                     $id = trim($id);
                     if (isset ($this->refs_list[$id])) {
-                        $prereq = preg_replace('/[^a-zA-Z_0-9]('.$id.')[^a-zA-Z_0-9]/', 'ITEM_'.$this->refs_list[$id], $prereq);
+                        $prereq = preg_replace(
+                            '/[^a-zA-Z_0-9]('.$id.')[^a-zA-Z_0-9]/',
+                            'ITEM_'.$this->refs_list[$id],
+                            $prereq
+                        );
                     }
                 }
 
@@ -3018,7 +2996,7 @@ class learnpath
             while ($row = Database::fetch_array($res)) {
                 $list[] = array(
                     'order_id' => ($row['order_id'] + 1),
-                    'objective_id' => urldecode($row['objective_id']), // urldecode() because they often have %2F or stuff like that.
+                    'objective_id' => urldecode($row['objective_id']), // urldecode() because they often have %2F
                     'score_raw' => $row['score_raw'],
                     'score_max' => $row['score_max'],
                     'score_min' => $row['score_min'],
@@ -3065,6 +3043,7 @@ class learnpath
     /**
      * Generate and return the table of contents for this learnpath. The JS
      * table returned is used inside of scorm_api.php
+     * @param strin $varname
      * @return  string  A JS array vairiable construction
      */
     public function get_items_details_as_js($varname = 'olms.lms_item_types')
@@ -3180,9 +3159,10 @@ class learnpath
 
     /**
      * Uses the table generated by get_toc() and returns an HTML-formatted string ready to display
+     * @param array $toc_list
      * @return	string	HTML TOC ready to display
      */
-    public function getListArrayToc($toc_list = null)
+    public function getListArrayToc($toc_list = [])
     {
         if ($this->debug > 0) {
             error_log('In learnpath::get_html_toc()', 0);
@@ -3289,8 +3269,8 @@ class learnpath
         }
 
         return $html;
-
     }
+
     /**
      * Gets the learnpath maker name - generally the editor's name
      * @return	string	Learnpath maker name
@@ -3756,21 +3736,6 @@ class learnpath
         return $has;
     }
 
-    /**
-     * Logs a message into a file
-     * @param	string 	Message to log
-     * @return	boolean	True on success, false on error or if msg empty
-     */
-    public function log($msg)
-    {
-        if ($this->debug > 0) {
-            error_log('New LP - In learnpath::log()', 0);
-        }
-        // TODO
-        $this->error .= $msg;
-        return true;
-    }
-
     /**
      * Moves an item up and down at its level
      * @param	integer	Item to move up and down
@@ -4192,7 +4157,7 @@ class learnpath
      * to normal users.
      * Can be used as abstract
      * @param integer    Learnpath ID
-     * @param string    New visibility
+     * @param string $set_visibility    New visibility
      * @return bool
      */
     public static function toggle_visibility($lp_id, $set_visibility = 1)
@@ -6546,7 +6511,7 @@ class learnpath
      * @param int $parentId
      * @param int $creatorId creator id
      *
-     * @return string
+     * @return int
      */
     public function create_document(
         $courseInfo,
@@ -6792,6 +6757,7 @@ class learnpath
      * Displays the selected item, with a panel for manipulating the item
      * @param int $item_id
      * @param string $msg
+     * @param bool $show_actions
      * @return string
      */
     public function display_item($item_id, $msg = null, $show_actions = true)
@@ -8110,9 +8076,7 @@ class learnpath
         if (is_array($arrLP)) {
             reset($arrLP);
         }
-
         $arrHide = array();
-
         // POSITION
         for ($i = 0; $i < count($arrLP); $i++) {
             if ($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id) {
@@ -8290,7 +8254,6 @@ class learnpath
 
         $sql = "SELECT * FROM $tbl_lp_item
                 WHERE c_id = $course_id AND lp_id = ".$this->lp_id;
-
         $result = Database::query($sql);
         $arrLP = array();
         while ($row = Database::fetch_array($result)) {
@@ -8505,7 +8468,9 @@ class learnpath
                 if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dir' &&
                     $arrLP[$i]['item_type'] !== TOOL_LP_FINAL_ITEM
                 ) {
-                    if (isset($extra_info['previous_item_id']) && $extra_info['previous_item_id'] == $arrLP[$i]['id']) {
+                    if (isset($extra_info['previous_item_id']) &&
+                        $extra_info['previous_item_id'] == $arrLP[$i]['id']
+                    ) {
                         $s_selected_position = $arrLP[$i]['id'];
                     } elseif ($action == 'add') {
                         $s_selected_position = $arrLP[$i]['id'];
@@ -8517,7 +8482,9 @@ 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 || $edit == 'true') {
+                if ($extra_info == 'new' || $item_type == TOOL_DOCUMENT ||
+                    $item_type == TOOL_LP_FINAL_ITEM || $edit == 'true'
+                ) {
                     if (isset ($_POST['content'])) {
                         $content = stripslashes($_POST['content']);
                     } elseif (is_array($extra_info)) {
@@ -9511,7 +9478,6 @@ class learnpath
     {
         $course_info = api_get_course_info();
         $sessionId = api_get_session_id();
-
         $documentTree = DocumentManager::get_document_preview(
             $course_info,
             $this->lp_id,
@@ -9762,7 +9728,7 @@ class learnpath
 
         $linksHtmlCode =
             '<script>
-            function toggle_tool(tool, id){
+            function toggle_tool(tool, id) {
                 if(document.getElementById(tool+"_"+id+"_content").style.display == "none"){
                     document.getElementById(tool+"_"+id+"_content").style.display = "block";
                     document.getElementById(tool+"_"+id+"_opener").src = "' . Display::returnIconPath('remove.gif').'";
@@ -10004,7 +9970,6 @@ class learnpath
      * @TODO The method might be redefined later on in the scorm class itself to avoid
      * creating a SCORM structure if there is one already. However, if the initial SCORM
      * path has been modified, it should use the generic method here below.
-     * @TODO link this function with the export_lp() function in the same class
      * @param	string	Optional name of zip file. If none, title of learnpath is
      * 					domesticated and trailed with ".zip"
      * @return	string	Returns the zip package string, or null if error
@@ -10356,7 +10321,6 @@ class learnpath
                                     }*/
                                     $file_path = $_SERVER['DOCUMENT_ROOT'].$doc_info[0];
                                     $file_path = str_replace('//', '/', $file_path);
-
                                     $abs_path = api_get_path(SYS_PATH).str_replace(api_get_path(WEB_PATH), '', $doc_info[0]);
                                     $current_dir = dirname($abs_path);
                                     $current_dir = str_replace('\\', '/', $current_dir);
@@ -10379,13 +10343,10 @@ class learnpath
                                     $current_dir = str_replace('\\', '/', $current_dir);
                                     $file_path = realpath($current_dir.$doc_info[0]);
                                     $file_path = str_replace('\\', '/', $file_path);
-
-                                    //error_log($file_path.' <-> '.$main_path,0);
                                     if (strstr($file_path, $main_path) !== false) {
                                         // 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($root_path));
-                                        //error_log('Reduced path: '.$file_path, 0);
                                         $zip_files_abs[] = $file_path;
                                         $link_updates[$my_file_path][] = array('orig' => $doc_info[0], 'dest' => $file_path);
                                         $my_dep_file->setAttribute('href', 'document/'.$file_path);
@@ -11091,7 +11052,6 @@ EOD;
                     return true;
                 }
             }
-
         }
 
         return false;
@@ -11104,8 +11064,8 @@ EOD;
     public function set_autolaunch($lp_id, $status)
     {
         $course_id = api_get_course_int_id();
-        $lp_id   = intval($lp_id);
-        $status  = intval($status);
+        $lp_id = intval($lp_id);
+        $status = intval($status);
         $lp_table = Database::get_course_table(TABLE_LP_MAIN);
 
         // Setting everything to autolaunch = 0
@@ -11330,6 +11290,7 @@ EOD;
      */
     public static function moveUpCategory($id)
     {
+        $id = (int) $id;
         $em = Database::getManager();
         /** @var CLpCategory $item */
         $item = $em->find('ChamiloCourseBundle:CLpCategory', $id);
@@ -11346,6 +11307,7 @@ EOD;
      */
     public static function moveDownCategory($id)
     {
+        $id = (int) $id;
         $em = Database::getManager();
         /** @var CLpCategory $item */
         $item = $em->find('ChamiloCourseBundle:CLpCategory', $id);
@@ -11404,6 +11366,7 @@ EOD;
      */
     public static function getCategory($id)
     {
+        $id = (int) $id;
         $em = Database::getManager();
         $item = $em->find('ChamiloCourseBundle:CLpCategory', $id);
 
@@ -11920,7 +11883,7 @@ EOD;
 
     /**
      * Create a forum for this learning path
-     * @param type $forumCategoryId
+     * @param int $forumCategoryId
      * @return int The forum ID if was created. Otherwise return false
      */
     public function createForum($forumCategoryId)