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# bcpow

(PHP 3, PHP 4, PHP 5)

bcpow -- Raise an arbitrary precision number to another

## 说明

string bcpow ( string left_operand, string right_operand [, int scale] )

Raise `left_operand` to the power `right_operand`.

## 参数

`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().

## 返回值

Returns the result as a string.

## 范例

例 1. bcpow() example

`<?php echo bcpow('4.2', '3', 2); // 74.08 ?>`

## 参见

bcpowmod()
bcsqrt()

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