PHP code analyzer suggestions?

Does anyone have any open source PHP code analyzer suggestions? To be more specific to my need, I’m looking for a tool that will walk an unfamiliar tree of code and return as results a list of methods/functions, arguments, globals, etc.

Thank you in advance,

-=- PalaDolphin

Can you use the reflection api?

alternatively, if the code base is tagged correctly, you could run a phpDocumentor over it?