Get User IP using PHP

 $client  = $_SERVER['HTTP_CLIENT_IP'];
 $forward = $_SERVER['HTTP_X_FORWARDED_FOR'];
 $remote  = $_SERVER['REMOTE_ADDR'];

What is the difference between HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR? – it is impossible to say. Different proxies may implement these, or may not. The implementations may vary from one proxy to the next, and they may not. A lack of a standard breeds question marks.
If more than one proxy was involved – the X-Forwarded-For: header might then contain a complete track of the forwarding chain, whereas the Client-IP: header would contain the actual client IP. This is pure speculation, however.

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