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(PHP 3, PHP 4, PHP 5)

pow -- Exponential expression

Description

number pow ( number base, number exp )

Returns base raised to the power of exp . If possible, this function will return an integer .

If the power cannot be computed, a warning will be issued, and pow() will return FALSE . Since PHP 4.2.0 pow() doesn't issue any warning.

Example 1. Some examples of pow()

<?php

var_dump(pow(2, 8)); // int(256)
echo pow(-1, 20); // 1
echo pow(0, 0); // 1

echo pow(-1, 5.5); // error

?>

Warning

In PHP 4.0.6 and earlier pow() always returned a float , and did not issue warnings.

Related Function(s)

exp()

sqrt()

bcpow()

gmp_pow()