gmp_powm
(PHP 4 >= 4.0.4, PHP 5)
gmp_powm — Raise number into power with modulo
说明
resource gmp_powm
( resource $base
, resource $exp
, resource $mod
)
Calculate (base raised into power exp ) modulo mod . If exp is negative, result is undefined.
参数
- 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.
返回值
The new (raised) number, as a GMP number.
范例
Example#1 gmp_powm() example
<?php
$pow1 = gmp_powm("2", "31", "2147483649");
echo gmp_strval($pow1) . "\n";
?>
上例将输出：
2147483648
