public static function dompdf_debug($type, $msg)
    {
        global $_DOMPDF_DEBUG_TYPES, $_dompdf_show_warnings, $_dompdf_debug;
        if (isset($_DOMPDF_DEBUG_TYPES[$type]) && ($_dompdf_show_warnings || $_dompdf_debug)) {
            $arr = debug_backtrace();

            echo basename($arr[0]["file"]) . " (" . $arr[0]["line"] . "): " . $arr[1]["function"] . ": ";
            Helpers::pre_r($msg);
        }
    }