Description:
------------
I used the fmod() function with float numbers, and it was an exact division, so it was supposed to return 0, instead of it, the Y value was returned.

Reproduce code:
---------------
<?php

  echo fmod(396456.06, 56636.58);

?>

Expected result:
----------------
fmod(396456.06, 56636.58) = 0

Actual result:
--------------
fmod(396456.06, 56636.58) = 56636.58

function f_mod($x,$y)
{
$i = floor($x / $y);
$a = $x - $i * $y;
return $a;
}

f_mod(396456.06, 56636.58) = 0