How can I study php effectively?

Why don't you learn the framework?

Codeigniter, Laravel

Digging and shoveling only one of the above two will double PHP's ability now

Laravel has some barriers to entry, so I recommend you to learn Codeigniter after learning it

If you use the above two things more than it is appropriate, you will now know what to do and what to do.

And find out more about the dependency management tool called composite

We can make your php project more modern

Codeigniter User Meeting: http://codeigniter-kr.org/

Laravel user meeting: http://laravel.co.kr/

I recommend PHP lectures for life coding. https://opentutorials.org/course/62