php man page for fmod

FMOD(3) 								 1								   FMOD(3)

fmod - Returns the floating point remainder (modulo) of the division of the arguments

SYNOPSIS
       float fmod (float  $x, float  $y)

DESCRIPTION
	Returns  the  floating point remainder of dividing the dividend ($x) by the divisor ($y). The remainder ($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.

PARAMETERS
	      o $x
		- The dividend

	      o $y
		- The divisor

RETURN VALUES
	The floating point remainder of $x/$y

EXAMPLES
       Example #1

	      Using fmod(3)

	      <?php
	      $x = 5.7;
	      $y = 1.3;
	      $r = fmod($x, $y);
	      // $r equals 0.5, because 4 * 1.3 + 0.5 = 5.7
	      ?>

PHP Documentation Group 														   FMOD(3)