PHP Manual: Raise number into power

Description

GMP gmp_pow(GMPintstring $num, int $exponent)

Raise num into power exponent.

Parameters

num

The base number.

A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init with automatic base detection (i.e. when base is equal to 0).

exponent

The positive power to raise the num.

Return Values

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

Examples

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";
?>

The above example will output:

2147483648
1