gmp_powm

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

gmp_powm — Raise number into power with modulo

gmp_powm ( GMP|int|string $num , GMP|int|string $exponent , GMP|int|string $modulus ) : GMP

Calculate (num raised into power exponent) modulo modulus. If exponent is negative, result is undefined.

num

The base number.

A GMP object, an int or a numeric string.

exponent

The positive power to raise the num.

A GMP object, an int or a numeric string.

modulus

The modulo.

A GMP object, an int or a numeric string.

The new (raised) number, as a GMP number.

Example #1 gmp_powm() example

<?php
$pow1 = gmp_powm("2", "31", "2147483649");
echo gmp_strval($pow1) . "\n";
?>

The above example will output:

2147483648

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https://www.php.net/manual/en/function.gmp-powm.php