php获取ip的方法

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("HTTP_X_FORWARDED")) {$ip = getenv("HTTP_X_FORWARDED");}else if (getenv("HTTP_FORWARDED_FOR")) {$ip = getenv("HTTP_FORWARDED_FOR");}else if (getenv("HTTP_FORWARDED")) {$ip = getenv("HTTP_FORWARDED");}else {$ip = $_SERVER["REMOTE_ADDR"];}return $ip;}