Get user IP Address

functions.php

<?php
/* Get user IP Address */
function getUserIP() {
     $IPAddress = '';
     if ($_SERVER['HTTP_CLIENT_IP'])
             $IPAddress = $_SERVER['HTTP_CLIENT_IP'];
     else if($_SERVER['HTTP_X_FORWARDED_FOR'])
             $IPAddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
     else if($_SERVER['HTTP_X_FORWARDED'])
             $IPAddress = $_SERVER['HTTP_X_FORWARDED'];
     else if($_SERVER['HTTP_FORWARDED_FOR'])
             $IPAddress = $_SERVER['HTTP_FORWARDED_FOR'];
     else if($_SERVER['HTTP_FORWARDED'])
             $IPAddress = $_SERVER['HTTP_FORWARDED'];
     else if($_SERVER['REMOTE_ADDR'])
             $IPAddress = $_SERVER['REMOTE_ADDR'];
     else
             $IPAddress = 'UNKNOWN';
 
     return $IPAddress; 
}