pow() 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.
And PHP cannot handle negative bases
Example:
PHP Code:
<?php
var_dump(pow(2, 8)); // int(256)
echo pow(-1, 20); // 1
echo pow(0, 0); // 1
echo pow(-1, 5.5); // error
?>