public static function browser()
    {
        foreach (self::$_browsers as $key => $value) {
            if (preg_match($key, self::http_user_agent())) {
                self::$_arguments['browser'] = $value;

                self::$_is['browser'] = TRUE;
                self::mobile();
                break;
            }
        }
        $return = "";
        $return .= self::$_arguments['browser'];
        $return .= self::mobile();
        return $return;


    }