What is the knowledge structure of a qualified PHP senior engineer?

What is the knowledge structure of a qualified PHP engineer?
Personally, a qualified PHP programmer at the 1% flagship store should have the following knowledge:
1. Familiar with PHP syntax, familiar with most common PHP built-in functions, you can not use the manual to write most of the program.
2. Familiar with object-oriented analysis and design methods.
3. Familiar with the basic theory of database, familiar with SQL, familiar with MySQL, can design an efficient database structure according to business logic.
4. Familiar with the Linux operating system, you can configure Apache/nginx, MYSQL, PHP.

Familiar with the grammar and so on do not say, that is the basic. Good phper I think it should have the following characteristics:
1. Understand the HTTP protocol and browser operating mechanism.
2. Elegant code style, the use of common design patterns.
3. High-traffic database design, high concurrent demand optimization scheme.
4. Understand PHP's underlying operating mechanism and be able to write simple pecl extensions.
5. At least master the basic operation of Linux and mainstream webserver building.

1 PHP basic syntax, idiomatic method
2 PHP Security-related knowledge
3 SQL optimization, basic knowledge of relational databases
4 basic operation of Linux system, because many PHP functions have evolved from Linux commands.
5 Apache, simple configuration of Nginx

