I've created this project in order to simplify the process of interacting with the Twitter API on a project I'm working on. So I decided to release it as open-source so that others could use it if they find it useful.
What is TwitterPHP? It's an object-oriented and easy to use PHP library to interact with the Twitter API. It is still in development but it has almost every API feature implemented, which makes it the most complete of it's kind (at least from what I've seen out there, please correct me if I'm wrong). You can do lots of stuff with TwitterPHP, you can write your own client, or bot, or even just use it to display twitter info on your blog or website.