如何从浮点数获得模数

Question

I have:

$value = 0.57;
$step = 0.01;

I want to check if $value/$step is integer. Additionally sometimes $value is negative.

What I get is:

$value/$step -> 57
is_int($value/$step) -> false
and the best one:
floor($value/$step) -> 56 (I assume that 57 is really 56.9999999(9) )
$a - $b * floor($a / $b) -> 0.0099999(9)
($value/$step)%1 -> 0 (ok, but % doesn't work if it is really a float)
fmod($value/$step) -> 0.999999999(9)

any idea?

Answer 1

other possibility: float as string modulo :-)

function float_modulo($value, $step) {
    $str_value = strval($value);
    $float_part_value = substr($str_value, strpos($str_value, ".") + 1);
    $str_step = strval($step);
    $float_part_step = substr($str_step, strpos($str_step, ".") + 1);    
    return intval($float_part_value) % intval($float_part_step);
}