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.
範例 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
?
|
|
警告 |
In PHP 4.0.6 and earlier
pow() always returned a
float, and did not issue warnings.
|
See also
exp() and sqrt().