TextMate is pretty well the editor of choice for just about all programming languages for my devs (we all work on OSX). While we don't do PHP, we do front-end (html, css, etc), Ruby on Rails, Java, shell, Python, etc.
Personally, I use UltraEdit when I need a text editor, especially now that it's got native versions for Windows, Mac OSX, and Linux.
Mac Text Editor | UltraEdit for Mac