PHP Reference

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.

Note: PHP cannot handle negative bases.

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.