User's IP address behind proxy server

[Anon]

when we use $_SERVER["REMOTE_ADDR"], and if we use a proxy server, we will get the proxy server's IP address. How can we get the user's real IP address behind proxy server?

[Anon]

Try this.

$ip = $REMOTE_ADDR;
$forwarder = $HTTP_X_FORWARDED_FOR;
if (($forwarder != "") && ($forwarder != "unknown")) {
$ip = $forwarder;
}