What should senior PHP programmers learn?

Senior PHP Programmer

Key point: In addition to the basic LNMP program, you can also work in a certain direction or field There is deep learning. (In-depth dimension development) (Recommended learning: PHP video tutorial)

Goal: In addition to completing basic PHP business development, you can also solve most in-depth and complex technical problems. And he can independently design and complete medium and large system design and development work; he can independently hold and go deep into a certain technical direction, and he is relatively professional in this area. (For example, in-depth research in any direction such as MySQL, Nginx, PHP, Redis, etc.)

Linux:

In addition to the second stage capabilities, in Linux In addition to regular operations and performance monitoring and tracking, you can also use many advanced and complex commands to complete the work (watch/tcpdump/starce/ldd/ar, etc.); in terms of shell scripts, you can already write more complex shell scripts (more than 500 lines) ) to assist in completing many shell tasks including backup, automated processing, monitoring, etc.; it is already proficient in applications such as awk/sed/perl, and can freely operate, control, process, text statistics and analyze data in various complex formats;

Have some understanding of the internal mechanisms of Linux, basic processing of kernel module loading, startup error handling, etc.; also understand some other related things, such as NFS, disk management, etc.;

Nginx:

Nginx is very proficient in operating, and can perform more in-depth operation and maintenance work on Nginx, such as monitoring, performance optimization, complex problem processing, etc.; depending on personal interests, more aspects You can consider focusing on in-depth study of the working principle of Nginx, mainly starting from reading the source code, such as the specific master/worker working mechanism, Nginx internal event processing, memory management, etc.;

You can also learn Nginx at the same time In the development of extensions, you can customize some of your own private extensions; at the same time, you can have a certain degree of understanding of Nginx Lua to see if it can be combined and applied to create a better model; the requirement at this stage is an in-depth understanding of the principles of Nginx, and you can consider becoming an Nginx developer In-depth professional in the direction.

MySQL/MongoDB:

Based on the second stage, in terms of MySQL applications, in addition to the previous basic SQL optimization, some complex operations can also be completed. For example, high-risk operations such as importing and exporting large batches of data, changing table structures or adding or deleting index fields for online large batches of data;

In addition to installation and configuration, it has been able to handle more complex MySQL problems, such as various Problem tracing, master-slave synchronization delay problem resolution, cross-computer room data synchronization solutions, MySQL high-availability architecture, etc. are all involved;

is familiar with the MySQL application level and is familiar with the core key technologies of MySQL, such as transactions Mechanisms (isolation levels, locks, etc.), and have a certain understanding and application of triggers, partitions and other technologies;

For MySQL performance, including disk optimization (SAS migration to SSD), server optimization (memory, server own configuration), in addition to other core performance optimization options (innodb_log_buffer_size/back_log/table_open_cache /thread_cache_size/innodb_lock_wait_timeout, etc.), connection pool software selection application, have an in-depth understanding of operation statements such as show * (show status/show profile), and be able to complete a large number of Partial performance problem tracing;

In-depth familiarity with MySQL backup technology, including disaster recovery and restoration, in-depth understanding of Binlog, hot and cold backup, multi-IDC backup, etc.;

In terms of MySQL principles, Have more knowledge, such as starting to read some source codes about the working mechanism of MySQL, such as learning the source code of master-slave synchronization (replication) technology, or learning and understanding the source code of a certain storage engine (MyISAM/Innodb/TokuDB), etc., if If conditions permit, you can refer to the CSV engine to develop your own simple storage engine to save some data and enhance your understanding of MySQL;

In this process, if you are interested, you can also consider developing in the direction of DBA. At the MongoDB level, you can consider, for example, starting to apply MongoDB online when writing less and reading more, or doing some online data analysis and processing operations. The specific scenarios can be based on the work, but the core is to have a better and in-depth understanding of RMDBS. For applications in different scenarios from NoSQL, if conditions or interests permit, you can start to learn more about the working mechanism of MongoDB.

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