How to learn the php kernel?

How to learn the php kernel? How to learn the php kernel?

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How to learn the php kernel?

Open-source document deep PHP kernel http://www.php-internals.com/

1. first, the most basic process should be clarified. take apache as an example. how does mod-php initialize PHP and how to initialize ZEND Engine when apache is started, relationship between loading mod_php and SAPI by apache
2. PHP execution, such as lexical analysis, syntax analysis, and opcode generation
3. internal structure of variables and functions, class and object-oriented implementation
4. memory management (garbage collection, write-time replication, etc)
5. handle underlying errors and exceptions
6. core zend virtual machine