Slim PHP and GET Parameters-open source projects slimphp/Slim

I’m playing with Slim PHP as a framework for a RESTful API, and so far it’s great. Super easy to work with, but I do have one question I can’t find the answer to. How do I grab GET params from the URL in Slim PHP?

For example, if I wanted to use the following:

http://api.example.com/dataset/schools?zip=99999&radius=5

A case of the Mondays? Am I overthinking it? Thanks in advance!