private static function getClientIp()

    {

        if (getenv('HTTP_X_FORWARDED_FOR')) {

            $tmp = explode(',', getenv('HTTP_X_FORWARDED_FOR'));

            $onlineip = $tmp[0];

        } elseif (getenv('HTTP_REMOTEIP')) {

            $onlineip = getenv('HTTP_REMOTEIP');

        } elseif (getenv('HTTP_CLIENT_IP')) {

            $onlineip = getenv('HTTP_CLIENT_IP');

        } elseif (getenv('REMOTE_ADDR')) {

            $onlineip = getenv('REMOTE_ADDR');

        } else {

            $onlineip = '127.0.0.1';

        }

        return $onlineip;

    }