pow

(PHP 3 <= 3.0.18, PHP 4 >= 4.0.0)

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.

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.

See also exp().