public static function version()
    {
        foreach (self::$_browsers as $key => $value) {
            if (preg_match($key, self::http_user_agent(), $math)) {
                self::$_arguments['version'] = $math[2];
                self::mobile();
                break;
            }
        }
        $return = "";
        $return .= self::$_arguments['version'];

        $return .= self::mobile();
        return $return;
    }