Recently, I am learning about development projects, and I have gradually entered the deep water area:

How to send feedback messages to users in the background?

How do users interact with each other?

For example: On my platform: a accepted the task posted by b. How do I tell b that a accepted your task? How do a and b interact to understand the completion of the task?

I hope you can give me some advice.

ps: Finally, I developed it in PHP and used the th3.2.3 framework. If there is a method other than PHP or TP framework, that’s fine too!