providers - How do service providers work in laravel?

Question

In laravel, when will the service provider in app/Providers be triggered in the program?
Can you provide a flow chart?

Answer 1

The service provider should be triggered the first time you access it, the first time you access it through the container

Answer 2

Service provider is a startup program. It first registers the class into the ioc container, and then loads some other things (optional);
For details, please see Service Provider

Answer 3

I understand that it is triggered during injection, that is, in the constructor of the callee. I don’t know if it’s right or not.