Helper class to retrieve data from WMI on Windows machines.
First create a connection to a remote machine.
$wmi = new wmi($host, $username, $password);
The name or IP address of the machine should be passed in by $host. The $username should be a local admin account on the target machine; $password is pretty obvious.
Create a connection to a local machine by not passing in any parameters.
$wmi = new wmi();
Once you have a new connection, you can retrieve an object containing information from a given win32 class.
$results = $wmi->getInfo('Win32_ComputerSystemProduct'); echo $results->IdentifyingNumber; echo $results->Name;
$results = $wmi->getInfo('Win32_ComputerSystem'); echo $results->Domain; echo $results->Name;
Microsoft list all of the available classes here.