服务器
$_SERVER['REMOTE_ADDR']
客户端
functiongetOnlineIP(){
if (getenv(‘HTTP_CLIENT_IP’)) return getenv(‘HTTP_CLIENT_IP’);
if (getenv(‘HTTP_X_FORWARDED_FOR’)) return getenv(‘HTTP_X_FORWARDED_FOR’);
if ($_SERVER["REMOTE_ADDR"])return $_SERVER["REMOTE_ADDR"];
if (!empty($HTTP_SERVER_VARS['REMOTE_ADDR'])) return$HTTP_SERVER_VARS['REMOTE_ADDR'];
}