ASK: Looking for an internal click tracking tool

I was wondering if anyone can recommend a click tracking tool for internal purposes. Preferably a php tool of some kind we can self-install/host.

I need to be able to create tracking codes or short urls for different links in our app, and see clicks, stats, etc.

What I'm looking for is essentially an internal bit.ly.

Or does someone know of a cheap service that provides this? thanks