PHP Function IP if behind a proxy

Following from my last post, here is the method to get your IP address if you are behind a proxy.

function getRealIPAddr() {
    // check ip from share internet
    if (!empty($_SERVER["HTTP_CLIENT_IP"])) {
        $ip=$_SERVER["HTTP_CLIENT_IP"];
    } elseif (!empty($_SERVER["HTTP_X_FORWARDED_FOR"])) {
        // to check ip is pass from proxy
        $ip=$_SERVER["HTTP_X_FORWARDED_FOR"];
    } else {
        $ip=$_SERVER["REMOTE_ADDR"];
    }
    return $ip;
}

As this method gets more accurate results it is better to use this than the previous function.