valid url

function valid_url($url) {
    $resURL = curl_init();
    curl_setopt($resURL, CURLOPT_NOBODY, true);
    curl_setopt($resURL, CURLOPT_URL, $url);
    curl_setopt($resURL, CURLOPT_BINARYTRANSFER, 1);
    curl_setopt($resURL, CURLOPT_HEADERFUNCTION, 'header_callback');
    curl_setopt($resURL, CURLOPT_FAILONERROR, 1);
    curl_setopt($resURL, CURLOPT_HEADER, false);
    curl_exec($resURL);
    $intReturnCode = curl_getinfo($resURL, CURLINFO_HTTP_CODE);
    curl_close($resURL);
    if ($intReturnCode != 200) {
        return 0;
    } else return 1;
}