Where can I find the block diagram of php js applications?

Question

PHP

I want to build the first js application (online store). backend in php.
I can't find the block diagram anywhere. There are separate parts, everything seems to be clear, but when it comes to practice, I can’t put it into the big picture because of the architecture that was not initially drawn.
Tell me where you can read about this (from a to z), or if someone has done such projects and understands this, can you draw a simple understandable block diagram?

Answer 1

I can't find the block diagram anywhere.

Do you imagine its size? It's stupid to even try to compose it.
Break the big problem into smaller ones until you can solve every small problem. Decomposition and all that. Never try to solve big problems with this kind of "approach". Nobody in their right mind does that.

Answer 2

From here: link