PHP - How to get the square root of an arbitrary precision number using the bcsqrt() function?

In PHP, the bcsqrt() function is used to get the square root of an arbitrary precision number. It accepts an arbitrary precision number as a string and gives the square root of that number after scaling the result to the specified precision.

Syntax

string bcsqrt($num_string, $scale)

Parameters

bcsqrt()The function accepts two different parameters: $num_string and $scale.

• $num_string - It represents the number whose square root is to be calculated. String type parameter.

• $scale − represents the number of digits appearing after the decimal point in the output.

Return value

bcsqrt()The function returns the square root of the number in string form.

< h2>Example 1

<?php
   // input numbers with arbitrary precision
   $num_string = "22";

   // below bcsqrt function calculates the square root
   $result= bcsqrt($num_string);
   echo "Output without scale value: ", $result;
?>

Output

Output without scale value: 4

Example 2

<?php
   // input numbers with arbitrary precision
   $num_string = "22";

   //scale value 3
   $scale="3";

   // below bcsqrt function calculates the square root
   $result= bcsqrt($num_string, $scale);
   echo "Output with scale value: ", $result;
?>

Output

Output with scale value: 4.690

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