public static function GetClientIpServer() {
        $ipaddress = '';
        if ($_SERVER['HTTP_CLIENT_IP'])
            $ipaddress = $_SERVER['HTTP_CLIENT_IP'];
        else if ($_SERVER['HTTP_X_FORWARDED_FOR'])
            $ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
        else if ($_SERVER['HTTP_X_FORWARDED'])
            $ipaddress = $_SERVER['HTTP_X_FORWARDED'];
        else if ($_SERVER['HTTP_FORWARDED_FOR'])
            $ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
        else if ($_SERVER['HTTP_FORWARDED'])
            $ipaddress = $_SERVER['HTTP_FORWARDED'];
        else if ($_SERVER['REMOTE_ADDR'])
            $ipaddress = $_SERVER['REMOTE_ADDR'];
        else
            $ipaddress = 'UNKNOWN';

        return $ipaddress;
    }