how to get Client IP address

Answer 1

echo $_SERVER['REMOTE_ADDR'];

http://php.net/manual/en/reserved.variables.server.php

Answer 2

The answer is to use $_SERVER variable like this: $_SERVER["REMOTE_ADDR"] to give you the IP address of the client computer.

Answer 3

function getip() {
    print "IP = ".$_SERVER["REMOTE_ADDR"];
}

getip();

Answer 4

Whatever you do, make sure not to trust data sent from the client. $_SERVER['REMOTE_ADDR'] contains the real IP address of the connecting party. That is the most reliable value you can find.

However, they can be behind a proxy server in which case the proxy may have set the $_SERVER['HTTP_X_FORWARDED_FOR'], but this value is easily spoofed. For example, it can be set by someone without a proxy, or the IP can be an internal IP from the LAN behind the proxy.

This means that if you are going to save the $_SERVER['HTTP_X_FORWARDED_FOR'], make sure you also save the $_SERVER['REMOTE_ADDR'] value. E.g. by saving both values in different fields in your database.