PHP 获取客户端 IP 地址
先来了解一个变量的含义:
$_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
/** * 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; }