php - Dingdong, what is the idea of ​​order reminder?

Question

After the customer places an order, I want to create an order reminder function. I would like to ask the master, what is the idea of ​​​​this function? ?

Answer 1

First of all, you can use ajax polling, which is also a more commonly used method

There is also the websocket mentioned above to establish a long connection.

Answer 2

WebSocket