Nginx - PHP - MySQL. Can you help me sort it all out?

Question

PHP

Help me understand the architecture of web applications and the order in which requests are processed on the server. If the application is running on Nginx - PHP - MySQL.
It would also be nice to know the role of each of the components.
Thank you in advance!

Answer 1

http request comes to the Nginx http server, then it is transmitted to php-fpm via a file (unix) socket, where there is already an initialized copy of the PHP script partially cached in Zend Opcache, or in XCache, the request is processed in it - routing is performed ( silex ' ohm) and queries in the database ( Doctrine 'om), after the database returns some result, it can be passed to the template engine ( Twig ), or presented as JSON 'a, and passed back to nginx with php-fpm' a, where the response is then sent to the browser and cached.