Thinkphp 获取访问者的ip

<?php

//在common/function  里面加入下函数

function GetIP()
{
if(!empty($_SERVER["HTTP_CLIENT_IP"]))
$cip = $_SERVER["HTTP_CLIENT_IP"];
else if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"]))
$cip = $_SERVER["HTTP_X_FORWARDED_FOR"];
else if(!empty($_SERVER["REMOTE_ADDR"]))
$cip = $_SERVER["REMOTE_ADDR"];
else
$cip = "无法获取！";
return $cip;
}

//在类里面直接调用就行了

public function test()

{

　　$data = I('test_data');
　　$ip = GetIP();

　　echo $ip;//实时ip

}

?>