The company gave me the website code. how should I learn?

The company gave me the website code. how can I learn what I need to read? I am a newbie. I just started to learn PHP for my website.
I don't know how to learn. please give me a hand.

Reply to discussion (solution)

Whether the framework is written or not, if it is a framework. You just need to learn this framework.

Whether it's a framework or code, we suggest you take a good look at the basics and find a reliable php basic textbook (n people on the forum asked this question)

We strongly recommend that you redo your company's website by yourself ~~~~~~~~

Modify, delete, and configure...

Watch it with your scalp

First, you have to have a basic idea. if you have time, you can browse all the directories and files of the project to find out what each directory is doing.
Mainly depends on the base class of the database to operate on, common function files (usually put common methods in a php file for easy introduction)
It is best to have a purposeful look at the code. for example, if you find the release function (hypothesis) in the original project, you have to go through the process of adding, deleting, modifying, and querying the code, how to use the database operation class in the original project (usually available) to operate the database

Learning PHP...
As mentioned above, I first figured out whether the code is using a framework. if so, what version is used for basic learning?
Then read the code processing process.
Make achievements

I think it is better to buy a basic book first, for example, to elaborate on php.

ECSHOP does not use a framework. it is process-oriented and uses the smarty template engine technology. In this way, how can I learn? the company gave me an e-commerce project code? Great Gods ~~~
@ U012984377 @ jam00 @ PhpNewnew