How many modules does php have?

php has three major modules: 1. PHP kernel, used to process requests, file streams, error handling, etc.; 2. zend engine, used to convert source files into machine language, and then run them on the zend virtual machine Run; 3. PHP extension layer, which is a set of functions, class libraries and streams used to perform some specific operations.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php includes a total of 3 modules: php kernel, zend engine, php extension layer.

• Kernel: Used to handle requests, file streams, error handling and other related processing
• zend engine: Convert source files into machine language (actually bytecode opCode), Then run it on the zend virtual machine (this is similar to the java virtual machine)
• The extension layer is a set of functions, class libraries and streams. PHP uses them to perform some specific operations, such as the need to use mysql extension. (The extension file entity is: PhpRoot/ext/php_mysql.dll

• zend engine, this is the lowest level.

• zend api

• zend extensions, extensions of zend engine. For example, the most famous Is: php_xdebug_version..._vc6.dll

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