What should you master in PHP in 3 years?

1. Linux
can smoothly use Shell scripts to complete a lot of automated work; awk/sed/perl also operates well and can complete a lot of tasks. Text processing and data statistics; basically able to install most non-special Linux programs (including various libraries, packages, third-party dependencies, etc., such as MongoDB/Redis/Sphinx/Luncene/SVN, etc.); understand basic Linux service, know how to view Linux performance indicator data, know basic problem tracking under Linux, etc.

2. Nginx

Based on the first stage, understand the more complex Nginx configuration; including multi-core configuration, events, proxy_pass, sendfile/tcp_* configuration, Know related configurations and performance impacts such as timeouts; know that nginx can also undertake configurations such as proxy servers and reverse static servers in addition to web servers; know basic nginx configuration tuning; know how to configure permissions, compile an nginx extension to nginx; know the basics The operating principle of nginx (master/worker mechanism, epoll), and why nginx performance is better than apache performance.

3. Redis/Memcached

In most medium-sized systems, cache processing will definitely be involved, so you must understand the basic cache; know the similarities and differences between Memcached and Redis and application scenarios, be able to install Redis/Memcached independently, and understand some basic features and limitations of Memcahed; understand the basic working principles and uses of Redis, understand conventional data types, know which types are used in which scenarios, understand Redis transactions, etc. In the principle part, you can have a general understanding of the memory structure of Memcached (slab mechanism). Redis understands the underlying implementation storage structure of common data types (SDS/linked list/SkipList/HashTable), etc. By the way, you can learn more about Redis's transactions, RDB, AOF and other mechanisms. Good

4. System design:

Able to design website architecture, database, and basic PHP framework selection for most medium-sized systems; perform performance testing, troubleshooting, etc.; be able to complete Similar: Browser -> CDN (Squid) -> Nginx PHP -> Cache -> Basic design, development and maintenance of database structure websites; capable of supporting the development and maintenance of basic websites with millions to tens of millions of traffic every day.

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