php 获取本机外网/公网IP

<p>php 获取本机外网/公网IP<br /> <br /> 大家一般都是用$_SERVER['REMOTE_ADDR']来获取用户IP,<br /> </p> <p>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。</p> <p>经过我的研究有两种方法来获取用户的真实外网IP。<br /> </p> <p>方法一:curl</p> <p><br /> function get_onlineip() {<br /> $ch = curl_init('http://www.ip138.com/ip2city.asp');<br /> curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);<br /> $a = curl_exec($ch);<br /> preg_match('/[(.*)]/', $a, $ip);<br /> return $ip[1];<br /> }</p> <p><br /> </p> <p>方法二:$_SERVER['HTTP_X_FORWARDED_FOR']来获取相应的地址</p> <p><br /> function get_onlineip() {<br /> $onlineip = '';<br /> if(getenv('HTTP_CLIENT_IP') &amp;&amp; strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {<br /> $onlineip = getenv('HTTP_CLIENT_IP');<br /> } elseif(getenv('HTTP_X_FORWARDED_FOR') &amp;&amp; strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {<br /> $onlineip = getenv('HTTP_X_FORWARDED_FOR');<br /> } elseif(getenv('REMOTE_ADDR') &amp;&amp; strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {<br /> $onlineip = getenv('REMOTE_ADDR');<br /> } elseif(isset($_SERVER['REMOTE_ADDR']) &amp;&amp; $_SERVER['REMOTE_ADDR'] &amp;&amp; strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {<br /> $onlineip = $_SERVER['REMOTE_ADDR'];<br /> }<br /> return $onlineip;<br /> }</p>
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