bcpowmod
(PHP 5, PHP 7)
bcpowmod — Raise an arbitrary precision number to another, reduced by a specified modulus
Description
$base
, string $exponent
, string $modulus
[, int $scale = 0
] ) : string
Use the fast-exponentiation method to raise
base to the power
exponent with respect to the modulus
modulus.
Parameters
-
base -
The base, as an integral string (i.e. the scale has to be zero).
-
exponent -
The exponent, as an non-negative, integral string (i.e. the scale has to be zero).
-
modulus -
The modulus, as an integral string (i.e. the scale has to be zero).
-
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.
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.
?>
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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