1. SAPI interface
PHP specific application programming interface.
2. Begin and end
After PHP starts executing, it goes through two main stages:
The start phase before processing the request and the end phase after the request.
1.1 Beginning stage:
1.1.1 Module initialization phase (MINT), only once.
1.1.2 Module activation stage (RINIT), PHP will call the RINIT function of all modules
1.2 End stage (PHP will enter the end stage when the script is executed to the end or by calling the exit() or die() function)
1.2.1 Disable module (RSHUTDOWN, corresponding to RINIT)
1.2.2 Close the module (MSHUTDOWN, corresponding to MINIT), when the web server exits or when the command line script is executed and exits
3. Single process SAPI life cycle
PHP in CLI/CGI mode belongs to the single-process SAPI mode. Close after processing a request.
PHP also does a lot of work between stages.
(1) Start
(2) Initialize several global variables
(3) Initialize some constants
(4) Initialize Zend engine and harmony components
(5) Parse php.ini
(6) Initialization of global operation functions
(7) Initialize statically built modules and shared modules (MINIT)
(8) Disable functions and classes
(9)ACTIVATION
(10) Activate Zend Engine
(11) Activate SAPI
(12) Environment initialization
(13) Module request initialization
(14) Running
The php_execute_script function contains the entire process of running a PHP script
(15)DEACTIVATION
(16)flush
sapi_flush flushes the last content
(17) Turn off the Zend engine
4. Multi-process SAPI life cycle
5. Zend Engine
The Zend engine is the core of the PHP implementation and provides the infrastructure for the language implementation.
PHP syntax time limit, script compilation and runtime environment, extension mechanism and memory management.
Many PHP extensions use the Zend API, and Zend is the implementation of the PHP language itself. PHP just uses the Zend core to build the PHP language.
Reference: http://www.php-internals.com/book/?p=chapt02/02-01-php-life-cycle-and-zend-engine
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