small php commercial grade open source project. Suggestions?

Hey guys, I'm learning PHP and I would like to have a look at the source code of a small "commercial grade" PHP project.

W开发者_如何学编程hy small? Well because I'm a beginner and big projects such as Drupal or Wordpress are overwhelming right now, aka I don't understand a lot.

Why "commercial grade"? I would like to see if things are done in a different way in comparison to theory, courses and books.

Thanks for any suggestion!

At Google Code you can search for open-source projects in PHP, browse and download its code and even contribute!

I wouldn't write off Drupal or WordPress completely because of their complexity. One good way to bite off a small chunk is to look at the code for a module or plugin. In particular, look for a popular module or plugin that looks interesting. Since those "popular" modules are in use on a lot of sites, they are likely to be more "commercial grade" than the less popular ones.

Check this out:
https://github.com/languages/PHP
http://sourceforge.net/directory/language:php/os:windows/freshness:recently-updated/
You will find lots of small projects.