Implementation of notifications. Loops in Yii2?

Question

Yii

Hey!
There is a yii2-basic application. There is a notification model, a controller and a database for them, everything is ready. Notifications work like an alarm clock. The database records the time when the notification should fire. So, I can’t understand, but in what place and in what way to implement a time check?
When I wrote for the desktop, there was always some kind of main loop where the whole thing could be twisted. And here I can’t understand which way to look and where to insert such a cycle. Or are cycles not needed at all?
I thought in the direction of the background cycle, demons (although I don’t quite understand what it is and how), in the direction of AJAX (but it’s still not clear where the cycle is?), in the direction of , which would be updated every few seconds, in the direction of the client-side cycle through js, but that seems like an ugly solution.<frame>
Tell me at least where to dig, you can even link to some examples. I will be glad to any infe!

Answer 1

Write a console application (controller) that accesses the database and sends (processes as you need) notifications. Hang up its execution on cron (let's say once a minute). profit.

Answer 2

If the load is small, you can pull Ajax through setInterval ( https://javascript.ru/setinterval)

Answer 3

If correctly I understand notifications at you should be deduced at clients in the browser. In this case, you should dig towards using sockets.