thinkphp获取用户ip

//获取用户真实IP

function getIp() {

    if (getenv("HTTP_CLIENT_IP")&& strcasecmp(getenv("HTTP_CLIENT_IP"),"unknown"))

        $ip = getenv("HTTP_CLIENT_IP");

    else

        if (getenv("HTTP_X_FORWARDED_FOR")&& strcasecmp(getenv("HTTP_X_FORWARDED_FOR"),"unknown"))

            $ip = getenv("HTTP_X_FORWARDED_FOR");

        else

            if (getenv("REMOTE_ADDR")&& strcasecmp(getenv("REMOTE_ADDR"),"unknown"))

                $ip = getenv("REMOTE_ADDR");

            else

                if (isset ($_SERVER['REMOTE_ADDR'])&& $_SERVER['REMOTE_ADDR']&& strcasecmp($_SERVER['REMOTE_ADDR'],"unknown"))

                    $ip = $_SERVER['REMOTE_ADDR'];

                else

                    $ip = "unknown";

    return ($ip);

}