PHP获取客户端的IP地址

首先我们来了解相关变量的含义：$_SERVER[‘REMOTE_ADDR‘]：浏览当前页面的用户计算机的ip地址$_SERVER[‘HTTP_CLIENT_IP‘]：客户端的ip$_SERVER[‘HTTP_X_FORWARDED_FOR‘]：浏览当前页面的用户计算机的网关$_SERVER[‘HTTP_X_REAL_IP‘]：nginx 代理模式下，获取客户端真实IP下面我们通过简单的代码示例来介绍PHP获取客户端IP地址的方法。/** * ?获取客户端IP地址 */function real_ip(){ ???$ip = $_SERVER[‘REMOTE_ADDR‘]; ???if (isset($_SERVER[‘HTTP_X_FORWARDED_FOR‘]) && preg_match_all(‘#\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}#s‘, $_SERVER[‘HTTP_X_FORWARDED_FOR‘], $matches)) { ???????foreach ($matches[0] AS $xip) { ???????????if (!preg_match(‘#^(10|172\.16|192\.168)\.#‘, $xip)) { ???????????????$ip = $xip; ???????????????break; ???????????} ???????} ???} elseif (isset($_SERVER[‘HTTP_CLIENT_IP‘]) && preg_match(‘/^([0-9]{1,3}\.){3}[0-9]{1,3}$/‘, $_SERVER[‘HTTP_CLIENT_IP‘])) { ???????$ip = $_SERVER[‘HTTP_CLIENT_IP‘]; ???} elseif (isset($_SERVER[‘HTTP_CF_CONNECTING_IP‘]) && preg_match(‘/^([0-9]{1,3}\.){3}[0-9]{1,3}$/‘, $_SERVER[‘HTTP_CF_CONNECTING_IP‘])) { ???????$ip = $_SERVER[‘HTTP_CF_CONNECTING_IP‘]; ???} elseif (isset($_SERVER[‘HTTP_X_REAL_IP‘]) && preg_match(‘/^([0-9]{1,3}\.){3}[0-9]{1,3}$/‘, $_SERVER[‘HTTP_X_REAL_IP‘])) { ???????$ip = $_SERVER[‘HTTP_X_REAL_IP‘]; ???} ???return $ip;}