gmp_powm

(PHP 4 >= 4.0.4, PHP 5)

gmp_powm — Raise number into power with modulo

resource gmp_powm ( resource $base , resource $exp , resource $mod )

Calculate (base raised into power exp) modulo mod. If exp is negative, result is undefined.

base

The base number.

It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

exp

The positive power to raise the base.

It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

mod

The modulo.

It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

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

Коментарии


can be used for RSA encryption/decryption!

2019-01-11 08:36:22