How to execute php script taking into account time?

Question

PHP

It is necessary to send notifications from php at a certain time. The time is set by the user, stored in a mysql table. Rather than follow this, using Cron to bypass is somehow expensive or something. What is used in such cases?
Thank you!

Answer 1

Usually, crons are used, they perform a check every minute and if the time set by the user has come, they send a notification.
Another option is to keep running some kind of daemon/script that will also check and send a notification.