Question

I’d like to have a php function which will deduct a value, say, 50 from an initial integer of say, 500 at a set interval.

For example: Every 30 days, deduct 50 from 500. So after 90 days, you are left with 350, etc.

I can do subtractions, it’s the interval routine that I can’t figure out.

If not PHP, JS is great too. This is used to count down a value from the beginning of the year, to the end.

Answer 1

You have a starting number, and you trying to figure out what your current value is. Its a basic total – (time pass * decrement) problem.

So example, You have your original time.

$originalDate = '2011-01-01';
$now = '2011-03-01';

//it will count no. of days
$dateDiff=(strtotime($now) - strtotime($originalDate))/ (60 * 60 * 24);

$startingValue = 500;
$descrement = 50;

$currentValue = $startingValue - ($dateDiff/30*$descrement);