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PHP5中文手册

gmp_pow

(PHP 4 >= 4.0.4, PHP 5)

gmp_pow — Raise number into power

说明

resource gmp_pow ( resource $base , int $exp )

Raise base into power exp .

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 .

返回值

The new (raised) number, as a GMP number. The case of 0^0 yields 1.

范例

Example#1 gmp_pow() example

<?php
$pow1 
gmp_pow("2"31);
echo 
gmp_strval($pow1) . "\n";
$pow2 gmp_pow("0"0);
echo 
gmp_strval($pow2) . "\n";
$pow3 gmp_pow("2", -1); // Negative exp, generates warning
echo gmp_strval($pow3) . "\n";
?>

上例将输出:

2147483648
1