php math algorithm

Question

Sorry it haven't occurred to me a better title :).

So I have two buttons that increase or decreases the decimal value of $page by 1, the problem is that I need to call external data whom paging system starts with 5 and adds 15 to change to next page, so $page's value don't apply.

The question is: how can I change $page's values from 1, 2, 3, 4... to 5, 20, 35, 50?

Gumbo · Accepted Answer · 2012-01-18 12:59:18Z

3

This should do it:

$start = 5;
$step = 15;
$result = $start + ($page-1) * $step;

answered Jan 18, 2012 at 12:59

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Gumbo

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Sufian Latif · Accepted Answer · 2012-01-18 12:59:59Z

1

Use 5 + (n - 1) * 15 as page number, n = 1, 2, 3, ...

answered Jan 18, 2012 at 12:59

Sufian Latif

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