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.

<?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"; 
  
?> 

Output:

3
4

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

<?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"; 
  
?> 

Output:

3
4

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

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Last Updated :
14 Apr, 2018