function getClientIp() {
        if (!empty($_SERVER['HTTP_CLIENT_IP']))
            return $_SERVER['HTTP_CLIENT_IP'];
        else if(!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
            return $_SERVER['HTTP_X_FORWARDED_FOR'];
        else if(!empty($_SERVER['HTTP_X_FORWARDED']))
            return $_SERVER['HTTP_X_FORWARDED'];
        else if(!empty($_SERVER['HTTP_FORWARDED_FOR']))
            return $_SERVER['HTTP_FORWARDED_FOR'];
        else if(!empty($_SERVER['HTTP_FORWARDED']))
            return $_SERVER['HTTP_FORWARDED'];
        else if(!empty($_SERVER['REMOTE_ADDR']))
            return $_SERVER['REMOTE_ADDR'];
        else
            return false;
    }