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php 获取本机外网/公网IP的代码_php技巧

WBOY
Release: 2016-05-17 09:25:53
Original
1316 people have browsed it

大家一般都是用$_SERVER['REMOTE_ADDR']来获取用户IP,

但是如果使用了反向代理的,HTTP头中REMOTE_ADDR就不是用户的地址,反而是上一级代理的地址了。

经过我的研究有两种方法来获取用户的真实外网IP。


方法一:curl

复制代码 代码如下:

function get_onlineip() {
$ch = curl_init('http://www.ip138.com/ip2city.asp');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$a = curl_exec($ch);
preg_match('/\[(.*)\]/', $a, $ip);
return $ip[1];
}



方法二:$_SERVER['HTTP_X_FORWARDED_FOR']来获取相应的地址
复制代码 代码如下:

function get_onlineip() {
$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;
}
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