How to use oAuth in your project?

Question

PHP

There is a project in which I want to give administrators the ability to create authorization through my user base. Of course, you can write your bike - it's not difficult and quite understandable. But for some reason I am attracted to oAuth.
Poryskav on the Internet, I did not find anything at all about how to implement this on my project. The project is in php, no CMS - self-written. There is strength and desire, but there is no material.
Of course, I don’t hope to run into “insert a value here and it will work”, but at least I hope for some more or less ready-made classes)