Staff API PHP example

I am having some problems forming the CURL POST to do login authentication against my helpdesk. Does anyone have example code they could post?

$data = array('username' => $_POST['username'], 'password' => $_POST['password']);
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, 'http://youracccount.kayako.com/staffapi/index.php?/Core/Default/Login');
curl_setopt ($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl_setopt ($ch, CURLOPT_POST, 1);
curl_setopt ($ch, CURLOPT_POSTFIELDS, "username=".$_POST[username]."&password=".$_POST[password]);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, TRUE);
$result = curl_exec($ch);

You can check this as well :

$datatolog["username"] = utf8_encode("username");
$datatolog["password"] = utf8_encode("password");
$url = "http://helpdesk.com/staffapi/index.php?/staffapi/index.php?/Core/Default/Login ";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_FAILONERROR, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_TIMEOUT, 15);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($datatolog,'','&'));
curl_setopt($ch,CURLOPT_ENCODING , "gzip");
$solution = curl_exec($ch);
curl_close($ch);
highlight_string($solution);