title: Profiling PHP code
body: <p>I'd like to find a way to determine how long each function in PHP, and each file in PHP is taking to run.  I've got an old legacy PHP application that I'm trying to find the "rough spots" in and so I'd like to locate which routines and pages are taking a very long time to load, objectively. </p>
  
  <p>Are there any pre-made tools that allow for this, or am I stuck using microtime, and building my own profiling framework?</p>