Beautify PHP
Tool reformats PHP source code to make the script more readable and easier to understand.
PHP Code Beautifier
An online tool to beautify PHP code that is submitted via input form or file upload, applying most of the PEAR standard requirements to it.
PHP Formatter/Obfuscator
Tools to prettyprint PHP and make it more readable, or to obfuscate the source and make it difficult to reverse-engineer. [Commercial]