PHP fmod() Function

The PHP fmod() function returns remainder (modulo) of the division of specified arguments. This can be mathematically expressed as below:

remainder = x - quot * y

Where quot is the result of x/y rounded toward zero. If y is non-zero, then remainder has the same sign as x and a magnitude less than the magnitude of y.

In special cases it returns the following:

• If any of the argument is NAN or both of the arguments are infinity, then the result is NAN.
• If the first argument is infinity and second argument is finite, then the result is NAN.
• If the second argument is zero, then the result is NAN.
• If the first argument is finite and second argument is infinity, then the result is same as first argument.

Syntax

fmod(x, y)

Parameters

Return Value

Returns remainder of the division of arguments (x/y).

Example:

In the example below, fmod() function is used to return the remainder of division of specified arguments.

<?php
echo "fmod(25, 7) = ".fmod(25, 7)."\n";
echo "fmod(-25, 7) = ".fmod(-25, 7)."\n";
echo "fmod(25, -7) = ".fmod(25, -7)."\n";
echo "fmod(-25, -7) = ".fmod(-25, -7)."\n";
echo "fmod(25, NAN) = ".fmod(25, NAN)."\n";
echo "fmod(NAN, 7) = ".fmod(NAN, 7)."\n";
echo "fmod(25, INF) = ".fmod(25, INF)."\n";
echo "fmod(INF, 7) = ".fmod(INF, 7)."\n";
?>

The output of the above code will be:

fmod(25, 7) = 4
fmod(-25, 7) = -4
fmod(25, -7) = 4
fmod(-25, -7) = -4
fmod(25, NAN) = NAN
fmod(NAN, 7) = NAN
fmod(25, INF) = 25
fmod(INF, 7) = NAN