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.
bcpow
说明
string bcpow ( string left_operand, string right_operand [, int scale] )
Raise left_operand to the power
right_operand.
参数
left_operandThe left operand, as a string.
right_operandThe right operand, as a string.
scaleThis optional parameter is used to set the number of digits after the decimal place in the result. You can also set the global default scale for all functions by using bcscale().
add a note
User Contributed Notes
11-Feb-2005 09:58
Michael Bailey (jinxidoru at byu dot net)
10-Aug-2004 12:42
10-Aug-2004 12:42
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