function getClientIp($type = 0) { ???$type ??????= ?$type ? 1 : 0; ???static $ip ?= ??NULL; ???if ($ip !== NULL) return $ip[$type]; ???if($_SERVER[‘HTTP_X_REAL_IP‘]){//nginx 代理模式下，获取客户端真实IP ???????$ip=$_SERVER[‘HTTP_X_REAL_IP‘]; ????????}elseif (isset($_SERVER[‘HTTP_CLIENT_IP‘])) {//客户端的ip ???????$ip ????= ??$_SERVER[‘HTTP_CLIENT_IP‘]; ???}elseif (isset($_SERVER[‘HTTP_X_FORWARDED_FOR‘])) {//浏览当前页面的用户计算机的网关 ???????$arr ???= ??explode(‘,‘, $_SERVER[‘HTTP_X_FORWARDED_FOR‘]); ???????$pos ???= ??array_search(‘unknown‘,$arr); ???????if(false !== $pos) unset($arr[$pos]); ???????$ip ????= ??trim($arr[0]); ???}elseif (isset($_SERVER[‘REMOTE_ADDR‘])) { ???????$ip ????= ??$_SERVER[‘REMOTE_ADDR‘];//浏览当前页面的用户计算机的ip地址 ???}else{ ???????$ip=$_SERVER[‘REMOTE_ADDR‘]; ???} ???// IP地址合法验证 ???$long = sprintf("%u",ip2long($ip)); ???$ip ??= $long ? array($ip, $long) : array(‘0.0.0.0‘, 0); ???return $ip[$type];}PHP 获取真实IP地址
原文地址：https://www.cnblogs.com/qixidi/p/10202523.html