php获取ip

public function actionGetIp(){
		static $realip;
		if (isset($_SERVER)) {
			if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
				$realip = $_SERVER['HTTP_X_FORWARDED_FOR'];
			} else if (isset($_SERVER['HTTP_CLIENT_IP'])) {
				$realip = $_SERVER['HTTP_CLIENT_IP'];
			} else {
				$realip = $_SERVER['REMOTE_ADDR'];
			}
		} else {
			if (getenv('HTTP_X_FORWARDED_FOR')) {
				$realip = getenv('HTTP_X_FORWARDED_FOR');
			} else if (getenv('HTTP_CLIENT_IP')) {
				$realip = getenv('HTTP_CLIENT_IP');
			} else {
				$realip = getenv('REMOTE_ADDR');
			}
		}
		return $realip;
	}