How to track php functions/codes duration of processing

Question

I am developing a browser based game and i\'d like to know which functions take the most time to process and so on.

Does anyone of you guys know what I can start wit

Answer 1

It sounds like you want xhprof. It excels at profiling.

Answer 2

There's also one called PHP APD

Answer 3

There's a profiler in XDebug.