12 Oct
2009
12 Oct
'09
11:08 a.m.
Can anyone explain this code's output?
<?php $x = (15/100) * 10.7; $y = 1.605; var_dump($x, $y, round($x,2), round($y,2),round(1.605,2)); ?>
Result: float(1.605) float(1.605) float(1.6) float(1.61) float(1.61)
In other words there is a difference between the values of $x and $y where they should both be 1.605 (and var_dump shows them both to be 1.605).
I assume this is because $x isn't really 1.605, but something very close to (and slightly below) 1.605 due to a rounding issue, so rounding to 2 decimal places causes it to round down not up. But I'm not sure how to change the code to give the correct results?
(15/100 you may notice as VAT; this is a VAT calculation, therefore I'm kinda duty bound to get the right result!)
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