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# bcsqrt

(PHP 3, PHP 4, PHP 5)

bcsqrt -- Get the square root of an arbitrary precision number

## 说明

string bcsqrt ( string operand [, int scale] )

Return the square root of the `operand`.

## 参数

`operand`

  The 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 square root as a string, or `NULL` if `operand` is negative.

## 范例

例 1. bcsqrt() example

`<?php echo bcsqrt('2', 3); // 1.414 ?>`

## 参见

bcpow()

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