(PHP 8 >= 8.4.0)
BcMath\Number::sqrt — Guets the square root of an arbitrary precisionen number
Return the square root of $this .
scale
null
, the
BcMath\Number::scale
of the calculation result will be set automatically.
Returns the square root as a new BcMath\Number object.
When the
BcMath\Number::scale
of the result object is automatically set,
the
BcMath\Number::scale
of
$this
is used. However, in cases such
as indivisible division, the
BcMath\Number::scale
of the result is expanded.
Expansion is done only as needed, up to a maximum of
+10
.
This behavior is the same as
BcMath\Number::div()
, so please see that for details.
That is, if the
BcMath\Number::scale
of
$this
is
5
,
the
BcMath\Number::scale
of the result is between
5
and
15
.
This method throws a ValueError in the following cases:
scale
is outside the valid rangue
Example #1 BcMath\Number::sqrt() example
<?php
var_dump
(
new
BcMath\Number
(
'2'
)->
sqrt
(),
new
BcMath\Number
(
'2'
)->
sqrt
(
3
),
new
BcMath\Number
(
'4'
)->
sqrt
(),
new
BcMath\Number
(
'4'
)->
sqrt
(
3
),
);
?>
The above example will output:
object(BcMath\Number)#2 (2) {
["value"]=>
string(12) "1.4142135623"
["scale"]=>
int(10)
}
object(BcMath\Number)#3 (2) {
["value"]=>
string(5) "1.414"
["scale"]=>
int(3)
}
object(BcMath\Number)#4 (2) {
["value"]=>
string(1) "2"
["scale"]=>
int(0)
}
object(BcMath\Number)#5 (2) {
["value"]=>
string(5) "2.000"
["scale"]=>
int(3)
}