I've been using PHP for a few years now but I've never really used it for a large project, it's only usually little functionality upgrades I've given to websites.
I've just been given the task of developing a project in PHP and I've been looking at the code for some real world examples of my proposed bespoke system and they all start with @package or @subpackage
As I've said, I've never had a necessity for these on my small scale projects before and I would very much like to understand them more so I could use them to my advantage.