Benjamin Eberlei has a new post to his blog today pointing you to some PHP & Hudson CI integration resources that can help you get this powerful combination up and running for your deployment process.
Although phpUnderControl is the most wide-spread, but from I heard complex to setup/maintain, solution
supposedly a hack and Arbit just in an early Alpha I decided to give Hudson a shoot. Another reason for this decision, I heard it has a simple plugin architecture and is easy to install and use.
He moved away from his own bash script-based CI setup towards something a bit more technical, something that would give him a bit more control over running unit tests, create code coverage, etc. He lists three sites that helped him get his Hudson install up and running and another is mentioned in the comments.