gmp_powm

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

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.

GMP 对象或 int ，或数字string。

exponent

The positive power to raise the num.

GMP 对象或 int ，或数字string。

modulus

The modulo.

GMP 对象或 int ，或数字string。

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

示例 #1 gmp_powm() example

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

以上示例会输出：

2147483648

down

5 years ago

can be used for RSA encryption/decryption!