如何用PHP获取用户IP地址
<?php /** * 客户端IP, * @return array|false|string */ function getIP(){ if (getenv("HTTP_CLIENT_IP")) $ip = getenv("HTTP_CLIENT_IP"); else if(getenv("HTTP_X_FORWARDED_FOR")) $ip = getenv("HTTP_X_FORWARDED_FOR"); else if(getenv("REMOTE_ADDR")) $ip = getenv("REMOTE_ADDR"); else $ip = "Unknow"; if(preg_match('/^((?:(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d)))\.){3}(?:25[0-5]|2[0-4]\d|((1\d{2})|([1 -9]?\d))))$/', $ip)) return $ip; else return ''; } /** * 服务器端IP * @return string */ function serverIP(){ return gethostbyname($_SERVER["SERVER_NAME"]); }