How to write a voice reminder that the time is up or there is an order?

Question

I have been learning PHP for a while, and now I am very curious about how to achieve two functions using a database.

1. Expiration voice reminder

2. Order reminder
   

Answer 1

Workerman has a long connection, and the scheduled task checks the database expiration every second and can actively send messages to the front end.

Answer 2

Use js to write a scheduled task, ajax asynchronous request, and the data returned each time is stored in the client. Then judge. This is a personal opinion. There are many ways,

Answer 3

The time interval can be query every 5-10 minutes.