(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() and sqrt().