php网页显示IP地址代码

怎么让网页显示访客的IP地址？
把下方PHP代码复制到要显示的网页代码处即可

<?php
if (!empty($_SERVER['HTTP_CLIENT_IP']))   
  {
    $ip_address = $_SERVER['HTTP_CLIENT_IP'];
  }
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))  
  {
    $ip_address = $_SERVER['HTTP_X_FORWARDED_FOR'];
  }
else
  {
    $ip_address = $_SERVER['REMOTE_ADDR'];  
  }
echo $ip_address;
?>