PHP round to precision 2

Question

My payment system takes 0.5% from each transaction. I have 0.9$ on my account, very small amount. And when I try to withdraw 0.9$ through API it gives an error, it takes 0.0045$ as fee and rounds to 0.91$. So I can only withdraw 0.89$ and pay 0.00445$ fee, which is rounded to 1 cent to empty my account;

I can't understand by which formula the additional fee is rounded =(

php round(0.9+0.9*0.005,2)

returns 0.9$, how to get 0.91$?

Edit: ceil works good for this particular amount, but on practice when I withdraw only 1 cent the comission, which is 0.00005 somehow does not count as 0.01, looks like besides ceil() only first two zeros after point are included. hm..

ceil((0.01*0.005) * 100) / 100; gives 1 cent, but in reality api takes zero.

`ceil(($value) * 100) / 100` will give 0.91. Not sure if it will give you what you want in every case though — StephenTG, Jul 23 '13 at 14:24

jh314 · Answer 1 · 2013-07-23T14:26:05.490

6

How about using ceil

$number = 0.9*0.005;
$number = ceil(100*$number) / 100; // rounds fee up to nearest cent
$number = $number + 0.9;
echo round($number,2);

edited Jul 23 '13 at 14:26

answered Jul 23 '13 at 14:19

jh314

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I improved my answer. – jh314 Jul 23 '13 at 14:26

Nico Westerdale · Answer 2 · 2016-11-01T20:44:08.853

0

Do not do multiplication inside a ceil function! You'll get floating point errors and it can be extremely unpredictable. To avoid this do:

function ceiling($value, $precision = 0) {
    $offset = 0.5;
    if ($precision !== 0)
        $offset /= pow(10, $precision);
    return round($value + $offset, $precision, PHP_ROUND_HALF_DOWN);
}

For example ceiling(2.2200001, 2) will give 2.23.

edited Nov 01 '16 at 20:44

answered Nov 01 '16 at 20:33

Nico Westerdale

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PHP round to precision 2

2 Answers2