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