public static function add_default_media($user_id, $type = '', $network_info = NULL)
 {
     // global var $path_prefix has been removed - please, use PA::$path static variable
     require_once "api/CNUser/CNUser.php";
     require_once "api/CNAlbum/CNAlbum.php";
     require_once "api/CNImage/CNImage.php";
     require_once "api/CNAudio/CNAudio.php";
     require_once "api/CNVideo/CNVideo.php";
     require_once "api/CNContentCollection/CNContentCollection.php";
     //$extra contains networks extra information
     $extra = unserialize($network_info->extra);
     /** setting common variables according to media type */
     if ($type == '') {
         $net_extra_ccid_str = $extra['user_defaults']['default_image_gallery'];
         $alb_type = IMAGE_ALBUM;
         $new_img = new CNImage();
     } elseif ($type == '_audio') {
         $net_extra_ccid_str = $extra['user_defaults']['default_audio_gallery'];
         $alb_type = AUDIO_ALBUM;
         $new_img = new CNAudio();
     } elseif ($type == '_video') {
         $net_extra_ccid_str = $extra['user_defaults']['default_video_gallery'];
         $alb_type = VIDEO_ALBUM;
         $new_img = new CNVideo();
     }
     /** getting array of content collection from comma separated string */
     if (!empty($net_extra_ccid_str)) {
         $net_extra_ccid = explode(',', $net_extra_ccid_str);
         /** setting all content collection variables */
         if (count($net_extra_ccid) >= 1) {
             for ($i = 0; $i < count($net_extra_ccid); $i++) {
                 $new_im_al = new Album($alb_type);
                 $new_im_al_default = new Album($alb_type);
                 $new_im_al->load((int) $net_extra_ccid[$i]);
                 $content_collection_obj = new ContentCollection();
                 $content_collection_obj->collection_id = $new_im_al->collection_id;
                 $contents = $content_collection_obj->get_contents_for_collection();
                 $new_im_al_default->title = $new_im_al->title;
                 $new_im_al_default->description = $new_im_al->description;
                 $new_im_al_default->author_id = $user_id;
                 $new_im_al_default->type = 2;
                 // FOR ALBUM, type is 2
                 $new_im_al_default->save();
                 /** Setting content variable */
                 for ($j = 0; $j < count($contents); $j++) {
                     if ($contents[$j]['type'] != 7) {
                         // If content is not a SB content
                         if ($alb_type == IMAGE_ALBUM) {
                             $new_img_default = new CNImage();
                             $new_img_default->type = IMAGE;
                         } elseif ($alb_type == AUDIO_ALBUM) {
                             $new_img_default = new CNAudio();
                             $new_img_default->type = AUDIO;
                         } elseif ($alb_type == VIDEO_ALBUM) {
                             $new_img_default = new CNVideo();
                             $new_img_default->type = VIDEO;
                         }
                         $new_img->load((int) $contents[$j]['content_id']);
                         $new_img_default->file_name = $new_img->file_name;
                         $new_img_default->file_perm = $new_img->file_perm;
                         $new_img_default->title = $contents[$j]['title'];
                         $new_img_default->body = $contents[$j]['body'];
                         $tags = Tag::load_tags_for_content($contents[$j]['content_id']);
                         $new_img_default->allow_comments = 1;
                         $new_img_default->author_id = $user_id;
                         $new_img_default->parent_collection_id = $new_im_al_default->collection_id;
                         $new_img_default->save();
                         if (!empty($tags)) {
                             $tag_array = array();
                             if (is_array($tags)) {
                                 for ($i = 0; $i < count($tags); $i++) {
                                     $tag_array[] = $tags[$i]['name'];
                                 }
                             }
                             Tag::add_tags_to_content($new_img_default->content_id, $tag_array);
                         }
                     } else {
                         // If content is a SB content
                         //TODO: handling of SB content if it is in media gallery.
                     }
                 }
             }
         }
     }
 }