On PHPMaster.com today there's a new post from Moshe Teutsch about working with docblock comments in PHP scripts and how to use the phpDocumentor tool to generate the documentation from them.

If you’ve ever tried to read code written by someone other than yourself (who hasn’t?), you know it can be a daunting task. [...] PhpDoc, short for PhpDocumentor, is a powerful tool that allows you to easily document your code via specially formatted comments. [...] By using PhpDoc, you can make it easy for others (and yourself) to understand your code - weeks, months, and even years after you’ve written it.

He introduces the concept of "docblocks" and includes several examples of how to comment things like packages, files, classes and functions/methods. Finally, he wraps up the post with an example of using the "phpdoc" command to run phpDocumentor and build the docs. In the comments, another tool is also suggested - DocBlox, a project that still parses the same docbloc syntax but does it in a much more memory efficient way (and is an actively maintained project).