HTTP_X_FORWARDED_FOR

On php.net I found this: When you use REMOTE_ADDR for getting the IP of the current user, sometimes you get the IP of the ISP Cache server. When this happens, the HTTP_X_FORWARDED_FOR is also set, it contains the IP of the user. [...] Note that the X-Forwarded for header might contain multiple addresses, comma separated, if the request was forwarded through multiple proxies. [...] My question is: If the X-Forwarded for header contains multiple addresses, comma separated, where do I find the one of the user? (I which order does it contain the adresses?) Do I get the right order (from the last proxies (at the beginning) to the user itself (at the end)) when I do this: $ip_route = $HTTP_SERVER_VARS["REMOTE_ADDR"] . "," . $HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"]; So that I finally have a chronological sorted list (i know: a string that contains the comma seperated ip-addresses of the users way to me (if they were forwarded by the proxie))? Am I right? Thanks for any coments about this.