bcpow

bcpow() only supports exponents less than or equal to 2^31-1. Also, bcpow() does not support decimal numbers. If you have scale set to 0, then the exponent is converted to an interger; otherwise an error is generated.
--
Michael Bailey
http://www.jinxidoru.com 

<?php
bcscale(100);
/*
 * Computes the natural logarithm using a series.
 * @author Thomas Oldbury.
 * @license Public domain.
 */
function bcln($a, $iter = 10)
{
 $result = "0.0";
 
 for($i = 0; $i < $iter; $i++)
 {
 $pow = (1 + (2 * $i));
 $mul = bcdiv("1.0", $pow);
 $fraction = bcmul($mul, bcpow(bcsub($a, "1.0") / bcadd($a, "1.0"), $pow));
 $result = bcadd($fraction, $result);
 }
 
 return bcmul("2.0", $result);
}
/*
 * Computes the base2 log using baseN log.
 * @note Requires above functions.
 * @author Thomas Oldbury.
 * @license Public domain.
 */
function bclog2($a, $iter = 10)
{
 return bcdiv(bcln($a, $iter), bcln("2", $iter));
}
/*
 * Computes the base10 log using baseN log.
 * @note Requires above functions.
 * @author Thomas Oldbury.
 * @license Public domain.
 */
function bclog10($a, $iter = 10)
{
 return bcdiv(bcln($a, $iter), bcln("10", $iter));
}
?>

Well, if bcpow has limits, then this should work:
<?php
function bcpow_($num, $power) {
 $awnser = "1";
 while ($power) {
 $awnser = bcmul($awnser, $num, 100);
 $power = bcsub($power, "1");
 }
 return rtrim($awnser, '0.');
}
?>
Just that $power cannot have decimal digits in it.