If the mall to do a rebate function, how to implement

If the mall wants to do a rebate function, how to implement
For example, the user bought 100 yuan of things, to return his 100 points, daily return 1 points, divided into 100 days to return.

In this case the database how to design, PHP about how to write, say the idea?

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Does PHP have the ability to execute code every day?

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Reference:
A field called "Integral", buy 100 to give it plus 100, every day backstage to take out those "points"! =0, minus 1 for them.


Take out those "points" in the background every day! =0
Does PHP have the ability to execute code every day?

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