Question

I have small problem and it might be silly somewhere, but still i have it 🙂

So the problem is:

By doing this

round(615.36*0.10, 2, PHP_ROUND_HALF_DOWN);

I expect outcome to be 61.53, but it’s 61.54.

phpVersion = 5.3.2

Could anyone help me to solve this?
Thanks.

Answer 1

PHP_ROUND_HALF_DOWN will round the half — i.e. the 0.005 part.

if you have 61.535, using PHP_ROUND_HALF_DOWN will get you 61.53 — instead of the 61.54 you should have obtained with usual rounding.

Basicall, the .005 half has been rounded down.

But 61.536 is not a half : .006 is more than .005 ; so rounding that value gives 61.54.

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In your case, you could multiply the value by 100, use the floor() function, and divide the result by 100 — I suppose it would give you what you expect :

$value = 61.536;
$value_times_100 = $value * 100;
$value_times_100_floored = floor($value_times_100);
$value_floored = $value_times_100_floored / 100;
var_dump($value_floored);

Gives me :

float(61.53)