What system are you using. Linux, Microreich, Mac, etc....?
I would say Cooledit if you are using Linux, or maybe even Nedit.
Quanta and Bluefish are a bummer for php edititing. They will work but the syntax highlighting is bunk(Bluefish) or there is little control over text size as it's displayed by the editor(Quanta).
There is also CodeCommander, and Moonshine, but I just couldn't get into those. Matter of tasted I guess.
Later on Senor Proggy,
Terrence