PHP fmod() Function – Returns Floating‑Point Remainder of Division

The article describes the PHP fmod() function, which returns the floating‑point remainder of dividing one number by another.

Syntax float fmod ( float $x, float $y ) Parameters $x – the dividend. $y – the divisor (must be non‑zero).

Return value

The function returns the remainder r such that x = i * y + r, where i is an integer; the sign of r matches the sign of x and its absolute value is less than y.

Example

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

The output comment shows that $r equals 0.5, confirming the function’s behavior.