How do I Delete a VM?/vApp - Undeploy?

Can someone provide an example of how to delete a vm via the PHP bindings?

ie $vmsdk->delete()?

I know this is probably sooo simple but I have looked and cannot find the method to do this.

thanks

Update:

I have found out its easy... just scroll to the bottom of the docs pages and see the inherited methods

So I can do this:

but run into the problem William describes here:

http://blogs.vmware.com/vsphere/2012/04/partially-powered-off-vapp-vms.html

I can do a

$task = $sdkVm->undeploy();

$service->waitForTask($task);

but it expects a parameter and I am not sure exactly what it is looking for here...  Any code example of the use of the undeploy($someObjectHere) would be appreciated.

Update:

was able to just create an object of that type and pass it in:

$undeployparams = new VMware_VCloud_API_UndeployVAppParamsType();

$task = $sdkVm->undeploy($undeployparams);

$service->waitForTask($task);

VM deleted.