(PHP 3 <= 3.0.18, PHP 4 >= 4.0.0)

pow -- Exponential expression


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()


var_dump( pow(2,8) ); // int(256)
echo pow(-1,20); // 1
echo pow(0, 0); // 1

echo pow(-1, 5.5); // error



In PHP 4.0.6 and earlier pow() always returned a float, and did not issue warnings.

See also exp().