(PHP 3, 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
?>
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| Warning |
In PHP 4.0.6 and earlier pow() always returned
a float, and did not issue warnings.
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See also exp().