How to learn php in depth and become a php expert

How can I learn php in depth and become a php Master? Understanding the disadvantages of PHP language design, such as lack of UTF-8 native support, lack of thread mechanism, lack of asynchronous mechanism to summarize the problems caused by these disadvantages, the scenario of each type of problem, in each scenario, we can further understand the history of PHP and why the market allows the existence of these defects to learn the design model (how to learn php in depth and become a php Master?

Understand the weaknesses of PHP language design, such
Lack of native UTF-8 support
No thread mechanism and no asynchronous mechanism
Summarize the problems caused by these disadvantages, the scenarios where each type of problem occurs, the handling methods in each scenario, the history of PHP, and the reasons why the market permits the existence of these defects

Learning Design Patterns (program architecture)
It is not difficult to use PHP to implement a complex function, but it is a challenge to make the final implementation highly flexible through the design itself, the design pattern is not the answer of 100%, but it can provide you with ideas to make code elegant. you can even look at the practical application of the design pattern in php by learning java.

Proficient in a framework, such as CI (which one is not very important)
The source code of the Debug framework, a little bit of understanding of the framework's code architecture, understanding why the author is doing this, what are the advantages and disadvantages, and in what scenarios these benefits and deficiencies are important, in what scenarios do they not matter? understand the author's choice during design. don't rush to judge, first understand it, and then transform it to fit your project reality.

Learning REST, SOA concepts, implementation modes, and application scenarios
Learn to understand the architecture of the application layer from these aspects

Enter a high-quality technical community, help others with their own accumulation, and further improve themselves

Improve your PHP skills by learning other languages
The use cases of PHP are limited. like any other language, it is often the same to know more deeply and comprehensively, in many cases, we need to use "breadth" to obtain "depth"