How to parse headers from a CURL response

gistfile1.php[345]

<?

class CurlResponse
{

    var $headers = array();

    function CurlResponse () {}

    function parse_header ($handle, $header)
    {
        $details = split(':', $header, 2);

        if (count($details) == 2)
        {
            $key   = trim($details[0]);
            $value = trim($details[1]);

            $this->headers[$key] = $value;
        }

        return strlen($header);
    }

}

$response = new CurlResponse();

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, "http://www.example.com");
curl_setopt($ch, CURLOPT_HEADERFUNCTION, array(&$response, 'parse_header'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_exec($ch);

print_r($response->headers);

?>

this is not returning the location header correctly