PHP script for getting the client IP address.

<?php

 //whether the ip is from share internet

if (!empty($_SERVER['HTTP_CLIENT_IP']))   
  {
    $ip_addr = $_SERVER['HTTP_CLIENT_IP'];
  }

//whether the ip is from a proxy

elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))  
  {
    $ip_addr = $_SERVER['HTTP_X_FORWARDED_FOR'];
  }

//whether the ip is from remote address

else
  {
    $ip_addr = $_SERVER['REMOTE_ADDR'];
  }
echo $ip_addr;
?>