Как добавить свой bb тег?

function build_audio5( $matches=array() ) {
        global $config;

        $url = $matches[1];

        if (!count($this->video_config)) {

            include (ENGINE_DIR . '/data/videoconfig.php');
            $this->video_config = $video_config;

        }

        $get_size = explode( ",", trim( $url ) );
        $sizes = array();

        if (count($get_size) == 2)  {

            $url = $get_size[1];
            $sizes = explode( "x", trim( $get_size[0] ) );

            $width = intval($sizes[0]) > 0 ? intval($sizes[0]) : $this->video_config['width'];
            $height = intval($sizes[1]) > 0 ? intval($sizes[1]) : $this->video_config['height'];

            if (substr ( $sizes[0], - 1, 1 ) == '%') $width = $width."%";
            if (substr ( $sizes[1], - 1, 1 ) == '%') $height = $height."%";

        } else {

            $width = $this->video_config['width'];
            $height = $this->video_config['height'];

        }

        $url = $this->clear_url( urldecode( $url ) );
        $url = str_replace("&","&", $url );
        $url = str_replace("&","&", $url );

        if( $url == "" ) return;

        if ( count($get_size) == 2 ) $decode_url = $width."x".$height.",".$url;
        else $decode_url = $url;

        $source = @parse_url ( $url );

        $source['host'] = str_replace( "www.", "", strtolower($source['host']) );

        if ($source['host'] != "youtube.com" AND $source['host'] != "youtu.be" AND $source['host'] != "vimeo.com" AND $source['host'] != "my.mail.ru") return "[audio5=".$url."]";

        if ($source['host'] == "youtube.com") {

            $a = explode('&', $source['query']);
            $i = 0;

            while ($i < count($a)) {
                $b = explode('=', $a[$i]);
                if ($b[0] == "v") $video_link = htmlspecialchars($b[1], ENT_QUOTES, $config['charset']);
                $i++;
            }

        }

        if ($source['host'] == "youtu.be") {
            $video_link = str_replace( "/", "", $source['path'] );
            $video_link = htmlspecialchars($video_link, ENT_QUOTES, $config['charset']);
        }

        if ($source['host'] == "youtube.com" OR $source['host'] == "youtu.be") {

            if ( $this->video_config['tube_dle'] ) {

                if ( count($get_size) == 2 ) $decode_url = $width."x".$height.",{$source['scheme']}://www.youtube.com/watch?v=".$video_link;
                else $decode_url = "{$source['scheme']}://www.youtube.com/watch?v=".$video_link;

                if( $this->video_config['flv_watermark'] ) $watermark = "&amp;showWatermark=true&amp;watermarkPosition={$this->video_config['flv_watermark_pos']}&amp;watermarkMargin=0&amp;watermarkAlpha={$this->video_config['flv_watermark_al']}&amp;watermarkImageUrl={THEME}/dleimages/flv_watermark.png";
                else $watermark = "&amp;showWatermark=false";

                $preview = "&amp;showPreviewImage=true&amp;getYouTubeVideoInfo=true";

                if ( $this->video_config['play'] ) {

                    $preview = "&amp;showPreviewImage=false&amp;autoPlays=true";

                }

                $this->video_config['buffer'] = intval($this->video_config['buffer']);

                if ( $this->video_config['autohide'] ) $autohide = "&amp;autoHideNav=true&amp;autoHideNavTime=3";
                else $autohide = "&amp;autoHideNav=false";

                $id_player = md5( microtime() );

                if( $this->video_config['use_html5'] ) {

                    
                    return "<!--dle_audio_begin:{$decode_url}--><audio width=\"{$width}\" controls=\"control\" preload=\"none\" src=\"//www.youtube.com/watch?v={$video_link}\" type=\"audio/youtube\"></audio><!--dle_audio_end-->";
                    
                
                } else {

                    return "<!--dle_audio_begin:{$decode_url}--><audio width=\"{$width}\" controls=\"control\" preload=\"none\" src=\"//www.youtube.com/watch?v={$video_link}\" type=\"audio/youtube\"></audio><!--dle_audio_end-->";
                    
                }

            } else return '<!--dle_audio_begin:'.$decode_url.'--><audio width="'.$width.'" src="http://www.youtube.com/watch?v='.$video_link.'" type="audio/youtube"></audio><!--dle_audio_end-->';

        } elseif ($source['host'] == "vimeo.com") {
            
            if (substr ( $source['path'], - 1, 1 ) == '/') $source['path'] = substr ( $source['path'], 0, - 1 );
            $a = explode('/', $source['path']);
            $a = end($a);

            $video_link = intval( $a );

            if ( count($get_size) == 2 ) $decode_url = $width."x".$height.",".$url;
            else $decode_url = $url;

            return '<!--dle_audio_begin:'.$decode_url.'--><iframe width="'.$width.'" height="'.$height.'" src="//player.vimeo.com/video/'.$video_link.'" frameborder="0" allowfullscreen></iframe><!--dle_audio_end-->';

        } elseif ($source['host'] == "my.mail.ru") {

            $video_link = $source['path'];

            if ( count($get_size) == 2 ) $decode_url = $width."x".$height.",".$url;
            else $decode_url = $url;

            return '<!--dle_audio_begin:'.$decode_url.'--><iframe src="//videoapi.my.mail.ru/videos/embed'.$video_link.'" width="'.$width.'" height="'.$height.'" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe><!--dle_audio_end-->';

        }

    }

function tag_audio5(){var a=get_sel(eval("fombj."+selField));a||(a="http://");DLEprompt(text_enter_url,a,dle_prompt,function(a){doInsert("[audio5="+a+"]","",!1);ie_range_cache=null})}