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]
- http://www.semdesigns.com/Products/Formatters/PHPFormatter.html

Beautify PHP
- Tool reformats PHP source code to make the script more readable and easier to understand.
- http://www.bierkandt.org/beautify/

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.
- http://www.tote-taste.de/X-Project/beautify/