Cml\Http\Request::ip PHP Method

    public static function ip()
    {
        if (isset($_SERVER['HTTP_CLIENT_IP'])) {
            return strip_tags($_SERVER['HTTP_CLIENT_IP']);
        }
        if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
            return strip_tags($_SERVER['HTTP_X_FORWARDED_FOR']);
        }
        if (isset($_SERVER['REMOTE_ADDR'])) {
            return strip_tags($_SERVER['REMOTE_ADDR']);
        }
        return 'unknown';
    }