<?php
function GetIPUser() {  
    if (!isset($_SERVER["HTTP_X_FORWARDED_FOR"])){   
     $_SERVER["HTTP_X_FORWARDED_FOR"] = $_SERVER["REMOTE_ADDR"];   
    }   
    $pos = strpos($_SERVER["HTTP_X_FORWARDED_FOR"], ",");  
    if ($pos > 0){ $ip = trim(substr($_SERVER["HTTP_X_FORWARDED_FOR"], 0, $pos)); } else {  
     $ip = $_SERVER["REMOTE_ADDR"];  
    }  
    return (!preg_match("/(d+).(d+).(d+).(d+)/", $ip)) ? "0.0.0.0" : $ip;   
   }
?>