Today I discovered a good tool for beautifying existing PHP Code. It works via a web interface. You can either upload a script or directly input it. The code is beautified according to the PHP PEAR Standard Requirements. It does not change or debug your code in any way.
He lists the things it can do for you and your code including setting indents to four spaces, uses the "one true brace" style for function definitions, and removes spaces between things like function calls, parenthesis and beginning of argument list.
You can check out the application and get information on more of the updates it will make on the project's homepage.