phpのcurlでhttpsのステータスコードを取得する方法

function get_status($url) {
	$ch = curl_init($url);
	curl_setopt($ch, CURLOPT_HEADER, true);    // we want headers
	curl_setopt($ch, CURLOPT_NOBODY, true);    // we don't need body
	curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
	curl_setopt($ch, CURLOPT_TIMEOUT,2);
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
	$output = curl_exec($ch);
	$httpcode = curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
	curl_close($ch);

	//echo 'HTTP code: ' . $httpcode;
	return $httpcode;
}