BC Math Functions

bcpowmod

Raise an arbitrary precision number to another, reduced by a specified modulus

Description

string bcpowmod ( string $left_operand , string $right_operand , string $modulus [, int $scale = 0 ] )

Use the fast-exponentiation method to raise left_operand to the power right_operand with respect to the modulus modulus.

Parameters

left_operand: The left operand, as a string.
right_operand: The right operand, as a string.
modulus: The modulus, as a string.
scale: This optional parameter is used to set the number of digits after the decimal place in the result. If omitted, it will default to the scale set globally with the bcscale function, or fallback to 0 if this has not been set.

Return Values

Returns the result as a string, or NULL if modulus is 0.

Notes

Note:
Because this method uses the modulus operation, numbers which are not positive integers may give unexpected results.

Examples

The following two statements are functionally identical. The bcpowmod version however, executes in less time and can accept larger parameters.


<?php
$a = bcpowmod($x, $y, $mod);

$b = bcmod(bcpow($x, $y), $mod);

// $a and $b are equal to each other.

?>

See Also

bcpow
bcmod