Get Real IP address using PHP

To get user IP in PHP, a lot of programmer would use $_SERVER[‘REMOTE_ADDR’]. However, it may not return the true IP address of the client.

When will $_SERVER[‘REMOTE_ADDR’] not return true IP ??

1)Client access through Proxy Server

It is because the client may be connected to your site through Proxy Server. By using $_SERVER[‘REMOTE_ADDR’], you may be able to the IP address of the proxy server not the client server.

2) Web Server sit behind loadbalancer

If your Web Server sit behind load balancer. The icoming request were recieved at load balancer and forward the request to your server. Under this suitation, by using $_SERVER[‘REMOTE_ADDR’], you may not be able to get the client IP address correctly.


In PHP, HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR, there are two extra Server variable which are useful to determine exact IP address of the client’s machine.

function getRealIPAddress()
 if (!empty($_SERVER['HTTP_CLIENT_IP']))   //check ip from share internet
 elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))   //to check ip is pass from proxy
 return $ip;

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