What is the best way to make a web version of the client-server?

Question

JavaScript

Greetings friends. There is one problem and now I'm thinking how to implement it ...

We need a simple service to send signals in real time, through a browser.
Let's say there are 8 people. Everyone enters the site and logs in with their own number. Then he sees 8 digits (numbers of all participants) and a button to send a request. When he presses (and holds) the button, the number under which he is registered in the service is highlighted for all participants (red), and when he releases the button, his number returns to its original state (black).
Such is the problem for the general development. The question is: is it possible to do this with php + ajax?
PS: This is my first post here, so sorry if it's wrong)

Answer 1

Websockets. Socket.io, and authentication on OIDC + jwt