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Most of us use $_SERVER['REMOTE_ADDR'] to find the client’s IP address in PHP. But you should know that it may not return the true IP address of the client at all time. Suppose if your client is connected to the Internet through Proxy Server then $_SERVER['REMOTE_ADDR'] in PHP just returns the IP address of the proxy server not of the client’s machine. So here is a simple function to find the real IP address of the client’s machine. Actually there are few Server variable (HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR) that return exact IP address of the client’s machine in PHP.

Use below mentioned function to find real IP address in PHP

In above PHP function, I have used $_SERVER['HTTP_CLIENT_IP'] server variable to get the direct IP address of client’s machine, if IP address of client’s machine not available then try for forwarded for IP address using HTTP_X_FORWARDED_FOR. if IP address using HTTP_X_FORWARDED_FOR not available, then finally try to get the IP address using REMOTE_ADDR.

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