How to avoid an infinite loop?

Question

PHP

Actually, my question is that the solution in the form of an infinite loop looks very unoptimized and ugly or something. Let's say I need to implement an alarm clock. I won't check the time every half second, will I? No other solution comes to mind. It is necessary that when a certain time is reached, the script itself is activated.

Answer 1

For example, you can use a timer, after specifying the time at what time to wake up, we calculate how long this timer should work and start it. As soon as the timer has worked, we wake up the person.

Answer 2

There will still be an infinite loop, either you write it or the library organizes it (some asynchronous framework like react, if your answer can be found in it).
In each specific case, you will need to implement it correctly in your own way.
With the clock, everything is simple - you need to check the time more than once a second, but take the shortest interval and calculate how long to wait before it (action time minus the current time) and simply set sleep with one command.