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.
scaleThis 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
?>
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