Sometimes applications get written by interns. Once you introduce an auth system such as FusionAuth, you typically want to have all applications use it, even those not written with OIDC/OAuth in mind.
This application is assumed to be modern enough to use composer to manage its dependencies, even though many older PHP applications don’t use such a tool. This tutorial is thorough, but not thorough enough to cover converting a PHP application to use a modern dependency management system.
If you cloned the repo, you can run this application like so: Visit http://localhost:8000 to see this application in action.