Are the class types correct?

Question

PHP

Guys, hello. I have a couple of questions.
1. Now, for the purpose of training, I am transferring my site (online store) to the oop style. I want to learn how to code in a new way. I decided to replace parts of the site gradually, pulling out the object and getting rid of the procedural code. Now I decide what objects will be. And that's what happened, right?
-Class "User" (methods: registration, authorization and management)
-Class "Product" (methods: loading, editing / deleting, other methods)
-Class "Controller" (methods: registering get variables, generating output based on output data)
-Class "Viewer" (view). Combines layout and objects for output by the controller.
2) Question. How to split one class into multiple files? I don't like it when a giant code is on one sheet, I'm used to splitting it into files. For example, one large method in one, the other in another, logical identical and small methods to combine. Apparently this is a normal class extension extend?

Answer 1

Translating an old case is no fun. I advise you to learn php fremvork.
For example codeigniter, cakephp.
And write your store on them from scratch.
It will be much more interesting in terms of learning, and so you will immediately learn the right things.

Answer 2

Now, for the purpose of training, I am transferring my site (online store) to the oop style. I want to learn how to code in a new way.

Learn frameworks.
They have already solved your problems.
In addition, by studying how they work, you will understand it faster than if you decide to reinvent it yourself.
Try to write short classes without going beyond 1000 lines.
If you have huge classes, then most likely the problem is in their incorrect selection from the subject area.