header('Content-Type: application/xml');
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://www.xxxxxx.com/api.php?action=auth&user=xxxx&pass=xxxx");
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, FALSE);
curl_exec($ch);
curl_close($ch);

curl -k 'https://www.xxxxx.com/api.php?action=auth&user=xxxx&pass=xxxx'