如何在分数部分中四舍五入

Question

I have some value like 2.3 , 3.6 , 3.8 now I want to get value as closest fraction.

suppose

when value is 2.3 then modified value will be 2.5 when value is 2.2 then modified value will be 2

Answer 1

I understand that you want to round to closest "half integer". If so, then you can use round() function but with a little modificators.

Because round() returns only integers, you need to modify your value before rounding and again after rounding in reverse way to make it work.

Since you want to round with 0.5, which is 1/2, you need to first multiply your value by 2, and divide it back after.

So the pattern here is:

$roundedVal = round($origVal*2)/2;

And examples from your question:

var_dump(round(2.3*2)/2); //2.5
var_dump(round(2.2*2)/2); //2.0

Answer 2

You need to look into PHP's round() function, and its optional flags.

$myValue = -5;

echo abs($myValue);   //outputs 5