curl_setopt($handle, CURLOPT_VERBOSE, true);

$verbose = fopen('php://temp', 'w+');
curl_setopt($handle, CURLOPT_STDERR, $verbose);
$result = curl_exec($handle);
if ($result === FALSE) {
    printf("cUrl error (#%d): %s
\n", curl_errno($handle),
           htmlspecialchars(curl_error($handle)));
}

rewind($verbose);
$verboseLog = stream_get_contents($verbose);

echo "Verbose information:\n
", htmlspecialchars($verboseLog), "
\n";