Searching For A Good PHP Development Environment?

kill-9.ws asks: "I'm a PHP developer, and up until this point, I've been using either Pico or EMACS to write all of my code. A text editor is fine for writing PHP, but I'm starting to look for more. I'd like to have some nice things like an editor that can do syntax highlighting for PHP and perhaps a function reference. Throw in a built-in FTP client, and that would be perfect. Does anyone know if such a thing exists?"