(PHP 4, PHP 5, PHP 7, PHP 8)
bcsqrt — Get the square root of an arbitrary precision number
$num, ?int $scale = null): string
Return the square root of the num.
numThe operand, as a string.
scaleThis optional parameter is used to set the number
of digits after the decimal place in the result. If omitted, it will default to the scale set
globally with the bcscale() function, or fallback to 0 if
this has not been set.
Returns the square root as a string, or null if
num is negative.
| Version | Description |
|---|---|
| 8.0.0 |
scale is now nullable.
|
Example #1 bcsqrt() example
<?php
echo bcsqrt('2', 3); // 1.414
?>