bcsqrt
(PHP 4, PHP 5)
bcsqrt — Get the square root of an arbitrary precision number
說明
string bcsqrt
( string $operand
[, int $scale
] )
Return the square root of the operand .
參數
- 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().
Return值
Returns the square root as a string, or NULL if operand is negative.
範例
Example#1 bcsqrt() example
<?php
echo bcsqrt('2', 3); // 1.414
?>