php根据ip段控制显示广告

以下代码是 PHP根据IP段控制显示广告

<?php function getIP() { 
$realip = ''; //设置默认值 
if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) 
{
$realip = $_SERVER['HTTP_X_FORWARDED_FOR']; } 
elseif (isset($_SERVER['HTTP_CLIENT_IP'])) { 
$realip = $_SERVER['HTTP_CLIENT_IP']; } 
else { $realip = $_SERVER['REMOTE_ADDR']; } 
preg_match('/^((?:\d{1,3}\.){3}\d{1,3})/',$realip,$match);
return $match?$match[0]:false; }
if(strpos(getIP(),'118.73.') !== false)
{
//echo '包含ip端则屏蔽广告'; }
//else{ //echo '不包含ip端则显示广告'; ?>
广告代码 <?php } ?>