gmp_powm

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

gmp_powmRaise number into power with modulo

说明

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.

参数

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

返回值

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

范例

示例 #1 gmp_powm() example

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

以上例程会输出:

2147483648

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User Contributed Notes 1 note

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jessietessie256 at gmail dot com
2 years ago
can be used for RSA encryption/decryption!
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