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;
}