bcmul
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
(PHP 4, PHP 5)
bcpow — Raise an arbitrary precision number to another
Description
string bcpow
( string $left_operand
, string $right_operand
[, int $scale
] )
Raise left_operand to the power right_operand .
Parameters
- left_operand
-
The left operand, as a string.
- right_operand
-
The right operand, as a string.
- scale
-
This 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().
Return Values
Returns the result as a string.
Examples
Example #1 bcpow() example
<?php
echo bcpow('4.2', '3', 2); // 74.08
?>
add a note
User Contributed Notesbcpow
12-Feb-2005 05:58
Michael Bailey (jinxidoru at byu dot net)
10-Aug-2004 08:42
10-Aug-2004 08:42
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