## Incorrect rounding issues, round down instead of up

I have a points system in place, at the moment, a customer gets assigned points and for every 500 points they get awarded a £5 voucher.

At the moment this is what I have, if someone is on 900 points then the output is showing that they have earned £10 so far which is incorrect. How can I round down so it'll just show £5 then when they get over 1000 points it'll show £10 etc.

<?php if($total >= 500) { $voucher_count = $total / 500; $voucher_rounded = round($voucher_count, 0) . "<br />"; $voucher_total = $voucher_rounded * 5; ?> <p class="earnings-to-date">You've earned £<?php echo $voucher_total; ?> so far</p> <?php } ?>

Just use the modulo operator (`%`

) to filter out the extra 400 (or whatever it is) before dividing by 500:

$total = 900; if($total >= 500) { $voucher_count = ($total - $total % 500) / 500; $voucher_total = $voucher_count * 5; echo $voucher_total; }

Output:

5

The modulo operator calculates the *remainder* of a division by the specified number. In this case:

($total - $total % 500) / 500;

Works out the remainder (`$total % 500 = 400`

), subtracts it from `$total`

and then divides by `500`

.

**php - Incorrect rounding issues, round down instead of up,** I have a points system in place, at the moment, a customer gets assigned points and for every 500 points they get awarded a �5 voucher. At the moment this is� Well, round off is what you usually do. If you have 0.9, 9 is above 5 so you'd round to 1. If you have 0.1, the digit you are rounding is less than 5, so you would round down to 0.

floor — Round fractions down https://www.php.net/manual/en/function.floor.php

$total = 900; if($total >= 500) { $voucher_count = $total / 500; $voucher_rounded = floor($voucher_count); $voucher_total = $voucher_rounded * 5; echo $voucher_total; // Output: 5 }

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Simply use `floor`

:

$voucher_total = round(floor($total/500)) * 5;

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