On the Developer Tutorials website, this new tutorial has been posted looking to help you get started with the PHP application framework CodeIgniter.
Chances are, however, that you just want to get on with coding, and don't want to have to deal with complex libraries. CodeIgniter achieves this wonderfully, staying out of your way but offering a lot of functionality if and when you need it.
The tutorial takes a little time to explain what an MVC framework is before getting in to how to use it (it makes more sense when you know how requests are handled). They create a simple "jobs" application to get you started that not only shows the structure of a simple app, but also includes how interface it with a (MySQL) database as well.