PHP获取客户端真实IP地址的方法

2013-08-10 · 71 words · 1 minute read

PHP

php

考虑到用户的浏览器访问网站可能会使用代理，服务器端的php代码必须使用多种判断，才能获取用户的真实IP地址。

<?php
function getClientIp(){
    $onlineip='';
    
if(getenv('HTTP_CLIENT_IP')&&strcasecmp(getenv('HTTP_CLIENT_IP'),'unknown')){
        $onlineip=getenv('HTTP_CLIENT_IP');
    }elseif(getenv('HTTP_X_FORWARDED_FOR')&&strcasecmp(getenv('HTTP_X_FORWARDED_FOR'),'unknown')){
        $onlineip=getenv('HTTP_X_FORWARDED_FOR');
    }elseif(getenv('REMOTE_ADDR')&&strcasecmp(getenv('REMOTE_ADDR'),'unknown')){
        $onlineip=getenv('REMOTE_ADDR');
    }elseif(isset($_SERVER['REMOTE_ADDR'])&&$_SERVER['REMOTE_ADDR']&&strcasecmp($_SERVER['REMOTE_ADDR'],'unknown')){
        $onlineip=$_SERVER['REMOTE_ADDR'];
    }
    return $onlineip;
}
?>