What additional literature to choose for a php developer?

Question

PHP

Background (not required reading): Not so long ago, but not yesterday, I began to study php for my own needs. I started, like the last shitcoder, with Popov. Actually, I accidentally stumbled upon video courses ... and reading books is a lack of time and a heavy workload at the university. I began to look, to assimilate everything ... but soon I realized that he was not a radish and knew no more than I did. Then, in search of answers, I came across various courses ... but the Specialist courses stood out from them. In principle, they explain there well and intelligibly both PHP and why you should not read "PHP in 24 hours", but you need to go to php.net.
Questions:
1) How can I reduce the percentage of govnokoda?
1.1 Where can you work with professionals?
1.2 How to get a job as an assistant to these pros for a minimal fee?
1.3 Where can I get someone else's code to parse it? (I mean the code that can teach something)
1.4 What books to read for this?
2) What are the tests to determine the level of knowledge of php? (Because I don’t graduate from university as a programmer, but I need to have at least some kind of certification. I’m more interested in free open tests)
3) I feel a lack of some kind of knowledge base in the basics (and not only the basics) of programming. What do you advise?
3.1 Qualitative literature on OOP (I'm not only about OOP phpe. Rather, even OOP in general, as a separate discipline)
3.2 Literature about programming. First I got into algorithms, but you need to know higher mathematics. Though with mathematics on you, but the highest I did not study almost.
3.3 Something from the networking course.
3.4 Other useful literature
4. Your advice.
I would be grateful for any help.
PS I don't have much time, so I don't want to waste time on low-quality or minimally useful literature.

Answer 1

1.3 Github
2. smarterer.com is not very objective, but will average out what you still don’t know for sure

Answer 2

learn by doing!

Answer 3

If you want to learn and reach the level of a professional, then you should start your own project or join an existing one. Only work experience helps to improve the quality of the code.
Books, of course, are good, but without the application of knowledge in them, it is a waste of time.

Answer 4

your project)
and then with a couple of projects in the studio

Answer 5

The best book on practical programming in ANY programming language is the one you write yourself, just by learning a little bit of the necessary theory and then fucking hundreds of projects for several years nonstop)))