Does something like this exist?

I'm wondering if there isn't something out there that crawls through your codebase and generates a map of (any of) the following: * What files are include in which scripts * The relationships between defined classes (eg A extends B) * What other classes are utilized by which classes (eg, instantiation) I've done some looking around but haven't really been able to find anything that does even some of this. I could write functionality that does this but didn't want to reinvent the wheel. thnx, Christoph