There is a free version, but I own it.
http://www.mpsoftware.dk/phpdesigner.php
To get the free go here: http://www.mpsoftware.dk/downloads.php
Oh I thought it was an editor that I haven't used but I have used PHP Designer before. I really didn't like the free version. I never did a trial of the pro version but I don't think I'm going to bother.