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
Описание
string bcpow
( string $left_operand
, string $right_operand
[, int $scale
] )
Raise left_operand to the power right_operand .
Список параметров
- 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().
Возвращаемые значения
Returns the result as a string.
Примеры
Пример #1 bcpow() example
<?php
echo bcpow('4.2', '3', 2); // 74.08
?>
add a note
User Contributed Notesbcpow
11-Feb-2005 01:58
Michael Bailey (jinxidoru at byu dot net)
09-Aug-2004 05:42
09-Aug-2004 05:42
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