The bcsqrt function is very handy for finding the square root of numbers in the form of strings.
//EXAMPLE:
<?php
$arr = array(
"one" => "20",
"two" => "12"
);
echo bcsqrt($arr["one"], 3);
//OUTPUT: 4.472
bcsqrt
(PHP 4, PHP 5, PHP 7, PHP 8)
bcsqrt — Get the square root of an arbitrary precision number
Parameters
-
num -
The operand, as a well-formed BCMath numeric string.
-
scale -
This 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
0if this has not been set.
Return Values
Returns the square root as a well-formed BCMath numeric string.
Errors/Exceptions
This function throws a ValueError in the following cases:
numis not a well-formed BCMath numeric stringnumis less than0scaleis outside the valid range
Changelog
| 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.
|
Examples
Example #1 bcsqrt() example
<?php
echo bcsqrt('2', 3); // 1.414
?>
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User Contributed Notes 1 note
markogrady18 at gmail dot com ¶
10 years ago
