PHP auto notification via email, the logic behind this

For example, I want my client to be notify via email on a set date and time in the future. Can PHP do this even if nobody is visiting the website?

What condition should I make? Should I save this on session, etc... I just want to know the logic on this. Any suggestions?

开发者_运维知识库

Thank you.

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If the server is using Linux, then you can use cron jobs

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You need to use cron job. And maybe its not the answer to your question but facebook uses this system too. Very interesting info about facebook's opensource platform https://developers.facebook.com/opensource/

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You can do this if you use a cron (or equivalent) job with PHP. A cron job executes a page every x time.