php

打印一下$_SERVER <?php echo json_encode($_SERVER, JSON_UNESCAPED_UNICODE); ?> 有这几项值得注意 "HTTP_X_FORWARDED_FOR":"[YOUR_IP]", "HTTP_CF_IPCOUNTRY":"[YOUR_COUNTRY]", "HTTP_CF_CONNECTING_IP":"[YOUR_IP]", "HTTP_CDN_LOOP":"cloudflare", 即 `$_SERVER["HTTP_X_FORWARDED_FOR"]` 就是客户端的真实IP地址 另外不支持IPv6的服务器也可以通过 $_SERVER["HTTP_X_FORWARDED_FOR"] 来获取客户端的IPv6地址 自动根据情况获取IP: $ip = isset($_SERVER['HTTP_X_FORWARDED_FOR']) && $_SERVER['HTTP_X_FORWARDED_FOR'] != "" ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR'];