help to implement local server oauth2

[Mznet77]

Hi, I need to create a Oauth2 Server for complete my study at university. I'm 44 yo and I work already, but I would like give a master at University, so i restarted to study.
Now I must implement a local Oauth2 server but I'm in serious trouble really, I'm not a web programmer and I never implement anythink about web application before.
I tried to setting my client to oauth2 authentication with google and github with success, but the project require a local Oauth Server also.
I not have idea how to can use your code to implement my local server, I tried but nothing work.
help me please

[menturion]

@Mznet77

Here you can find a demo example ... https://github.com/bshaffer/oauth2-demo-php