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I have an application in PHP that helps people fix appointments.
How could I code to send SMS’s 15 minutes before the start of the meeting time?
I have code that takes care of sending SMS’s. I just need to call the send method at the appropriate time.
Your best bet is making a script that sends an SMS to everyone who has a meeting in 15 minutes and set a cron job (or something similar if not on Unix) to run the script every 5 minutes or so.