This article mainly introduces the method of obtaining the real IP address of the client with PHP. It has certain reference value. Now I share it with you. Friends in need can refer to it
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REMOTE_ADDR HTTP_CLIENT_IP HTTP_X_FORWARDED_FOR HTTP_VIA
HTTP_CLIENT_IP is the HTTP header sent by the proxy server. If it is a "super anonymous proxy", a value of none is returned. Likewise, REMOTE_ADDR will be replaced with the IP of this proxy server.
$_SERVER['REMOTE_ADDR']; //Accessing end (may be user, may be proxy) IP
$_SERVER['HTTP_CLIENT_IP']; //Agent end ( It may exist and can be forged)
$_SERVER['HTTP_X_FORWARDED_FOR']; //Which IP the user is using as a proxy (It may exist and it can also be forged)
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##Three The value difference is as follows:
1. When no proxy server is used:
REMOTE_ADDR = Your IPHTTP_VIA = No value or not displayed
HTTP_X_FORWARDED_FOR = No value or not displayed
2. When using a transparent proxy server: Transparent Proxies
REMOTE_ADDR = The last proxy server IPHTTP_VIA = Proxy server IP
HTTP_X_FORWARDED_FOR = your real IP. When passing through multiple proxy servers, this value is similar to the following: 203.98.182.163, 203.98.182.163, 203.129.72.215.
3. When using ordinary anonymous proxy servers: Anonymous Proxies
REMOTE_ADDR = Last proxy server IPHTTP_VIA = Proxy server IP
HTTP_X_FORWARDED_FOR = Proxy server IP, when passing through multiple proxy servers, this value is similar to the following: 203.98.182.163, 203.98.182.163, 203.129.72.215.
4. The use of deceptive proxy servers: Distorting Proxies
REMOTE_ADDR = Proxy server IPHTTP_VIA = Proxy server IP
HTTP_X_FORWARDED_FOR = Random IP, when passing through multiple proxy servers, this value is similar to the following: 203.98.182.163, 203.98.182.163, 203.129.72.215.
5. When using a high-anonymity proxy server: High Anonymity Proxies (Elite proxies)
REMOTE_ADDR = Proxy server IPHTTP_VIA = No value or not displayed
HTTP_X_FORWARDED_FOR = No value or not displayed. When passing through multiple proxy servers, this value is similar to the following: 203.98.182.163, 203.98.182.163, 203.129.72.215.
6. Example of obtaining the real IP address of the client:
function get_real_ip() { $ip=FALSE; //客户端IP 或 NONE if(!empty($_SERVER["HTTP_CLIENT_IP"])){ $ip = $_SERVER["HTTP_CLIENT_IP"]; } //多重代理服务器下的客户端真实IP地址(可能伪造),如果没有使用代理,此字段为空 if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ips = explode (", ", $_SERVER['HTTP_X_FORWARDED_FOR']); if ($ip) { array_unshift($ips, $ip); $ip = FALSE; } for ($i = 0; $i < count($ips); $i++) { if (!eregi ("^(10│172.16│192.168).", $ips[$i])) { $ip = $ips[$i]; break; } } } //客户端IP 或 (最后一个)代理服务器 IP return ($ip ? $ip : $_SERVER['REMOTE_ADDR']); }
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