public function filter_ip( ){

		// get IP
		$ip = $_SERVER['REMOTE_ADDR'];
		if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
			$ip = $_SERVER['HTTP_CLIENT_IP'];
		} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
			$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
		}

		return $ip;

	}