COM issue, problems with return type.

Hello all, I am having a little problem with return types from a COM object. Basically (code follows) I get a collection back from the object and I can not figure out a way to iterate through this collection. Posted is a snippet of test code that I hope one of you can help me with. <?php echo "Starting\n"; $system = new COM("ADSystemInfo") or die("failed to get system info"); $usr = new COM("WinNT://$system->DomainDNSName/USERID,user") or die("failed on usr"); $groups = $usr->Groups() or die("fail"); //Groups should be a collection of objects that I can iterate through, but for //of me I can't figure out how. //iteration through group should be here. ?> If someone could point me to some relevent documentation about this It would be great. Thanks, Eric