(PHP 4 >= 4.2.0, PHP 5)
fmod — Returns the floating point remainder (modulo) of the division of the arguments
Returns the floating point remainder of dividing the dividend (x) by the divisor (y). The reminder (r) is defined as: x = i * y + r, for some integer i. If y is non-zero, r has the same sign as x and a magnitude less than the magnitude of y.
The dividend
The divisor
The floating point remainder of x/y
Example #1 Using fmod()
<?php
$x = 5.7;
$y = 1.3;
$r = fmod($x, $y);
// $r equals 0.5, because 4 * 1.3 + 0.5 = 5.7
?>