PHP | gmp_sqrt() Function

The gmp_sqrt() is a built-in function in PHP which is used to calculate the square root of a GMP number (GNU Multiple Precision : For large numbers). This function returns only the integral part of the square root of the GMP number.

Syntax:

gmp_sqrt ( $num )

Parameters: This function accepts a GMP number $num as a mandatory parameter as shown in the above syntax. This parameter can be a GMP object in PHP version 5.6 and later, or we are also allowed to pass a numeric string provided that it is possible to convert that string to a number.



Return Value: This function returns a GMP number which is the square root of a GMP number passed to it as parameter. This function only returns the integral part of the square root of the GMP number passed to it as argument.

Examples:

Input : "9"
Output : 3

Input : "24"
Output : 4

Below programs illustrate the gmp_sqrt() function in PHP :

Program 1: Program to calculate the square root of a GMP number when numeric strings as GMP numbers are passed as arguments.

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<?php
// PHP program to calculate the square root 
// of a GMP number passed as arguments 
  
// strings as GMP numbers 
$num1 = "9";
$num2 = "24";
  
// calculates the square root of a GMP number
$squareRoot = gmp_sqrt($num1);
echo $squareRoot."\n";
  
// calculates the square root of a GMP number
$squareRoot = gmp_sqrt($num2);
echo $squareRoot."\n";
  
?>

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Output:

3
4

Program 2: Program to calculate the square root of a GMP number when GMP numbers are passed as arguments.

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<?php
// PHP program to calculate the square root 
// of a GMP number
  
// creating GMP numbers using gmp_init()
$num1 = gmp_init(9, 10);
$num2 = gmp_init(24, 10);
  
// calculates the square root of a GMP number
$squareRoot = gmp_sqrt($num1);
echo $squareRoot."\n";
  
// calculates the square root of a GMP number
$squareRoot = gmp_sqrt($num2);
echo $squareRoot."\n";
  
?>

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Output:

3
4

Reference:
http://php.net/manual/en/function.gmp-sqrt.php



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