(PHP 4, PHP 5, PHP 7, PHP 8)
bcsqrt — Get the square root of an arbitrary precision number
numThe operand, as a well-formed BCMath numeric string.
scalenull , it will default to the default scale set with bcscale() ,
or fallback to the value of the
bcmath.scale INI directive.
Returns the square root as a well-formed BCMath numeric string.
This function throws a ValueError in the following cases:
num is not a well-formed BCMath numeric stringnum is less than 0scale is outside the valid range| Version | Description |
|---|---|
| 8.0.0 |
If num is not a well-formed BCMath numeric string,
or less than 0, a ValueError is thrown.
Previously, E_WARNING was raised instead.
|
| 8.0.0 |
scale now needs to be between 0
and 2147483647; previously, negative scales have been
silently treated as 0.
|
| 8.0.0 |
scale is now nullable.
|
Example #1 bcsqrt() example
<?php
echo bcsqrt('2', 3); // 1.414
?>