bcscalebcsqrt
(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 -
此可选参数用于设置结果中小数点后的小数位数。也可通过使用 bcscale() 来设置全局默认的小数位数，用于所有函数。
返回值
Returns the square root as a string, or NULL if
operand is negative.
范例
Example #1 bcsqrt() example
<?php
echo bcsqrt('2', 3); // 1.414
?>
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