Debuging in PHP

[eluser]Unknown[/eluser]
How the debugging techniques are in use by everyone for PHP and CI. I ran across an issue and ended up using some odd techniques myself.

Here is what I have done so far:

1. Added echo statements at certain points to see if the code was being called (if(..) statements, etc.)
2. Enabled error logging in CI
3. Commented out the set_error_handler(..) call in Front_controller.php so I could see the entire error message with line #‘s included.

Any other good ways to debug stuff in PHP and/or CI?

I really miss breakpoints and stepping through code as it runs….