pow
(PHP 3, PHP 4 )
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.
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.
See also: exp(), sqrt(), bcpow(), and gmp_pow(),
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