List Devices Using cUrl

Hi Guys,

I am trying to monitor a dynamic IP system using Zenoss. I have my own DNS service and have written a PHP script to add users and update their IP every ten minutes using cUrl. This is working perfectly and I'm really happy with the system. The final thing I need to do is delete devices that are no longer used. So effectively I need to get a list of all devices on Zenoss, compare them against the true devices and remove any that do not match.
I am struggling to get the list of devices.

If I navigate to the following url I can see all the devices in an array. However, when using cUrl rather than seeing the devices, I get an empty array with commas, so it seems to get the right count of devices, but does not display any details like when navigating via a web browser.

http://myurl:8080/zport/dmd/Devices/devices

Here is the code I am using:

$ch = curl_init();
curl_setopt($ch, CURLOPT_USERPWD, "$zenossusername:$zenossPassword");
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt( $ch, CURLOPT_COOKIESESSION, true );
curl_setopt( $ch, CURLOPT_COOKIEJAR, 'cookie.txt' );
curl_setopt( $ch, CURLOPT_COOKIEFILE, 'cookie.txt' );
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

$url = "http://myurl:8080/zport/dmd/Devices/devices";

curl_setopt($ch, CURLOPT_URL, $url);
curl_exec($ch);