$uid = '12345678901';

$url = 'http://metrics-us.mediabrix.com/entrypt?eval='. $uid . '&format=xml';

function curl_request($url,  $postdata = false) //single custom cURL request.
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_HEADER, TRUE);
    curl_setopt($ch, CURLINFO_HEADER_OUT, true);
    curl_setopt($ch, CURLOPT_VERBOSE, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);    

    curl_setopt($ch, CURLOPT_URL, $url);

    if ($postdata)
    {
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);  
    }

    $response = curl_exec($ch);

    curl_close($ch);

    return $response;
}

//echo curl_request($url);