PHP | gmp_root() Function

0 0 2 minutes read

The gmp_root() is an in-built function in PHP which returns the integer part of the N-th root of a GMP number(GNU Multiple Precision: For large numbers).
Syntax:

gmp_root( $num, $n )

Parameters: The function accepts two mandatory parameters $num and $n.

$num – This is the GMP number whose integer part of the n-th root is returned. The parameter is 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.
$n – the positive n-th root of the number. It is an integer value.

Return Value: This function returns a positive GMP number which is the integer part of the N-th root of the $num.
Examples:

Input : $num = "20" $n = 2
Output : 4 

Input : $num = "9" $n = 2
Output : 2

Below programs illustrate the gmp_root() function:
Program 1: The program below demonstrates the working of gmp_root() function when GMP number is passed as argument..

php

<?php
// PHP program to calculate the 
// integer part of N-th root of  
// a GMP number 
 
// GMP number as arguments 
$num = gmp_init("1001", 2); 
$n = 3;
 
// function calculates the pow raised to 
// number modulo mod  
     
//  integer part of cubic root of 9
$root = gmp_root($num, $n);  
 
// gmp_strval Convert GMP number to string 
// representation in given base(default 10).
echo gmp_strval($root, 2);
?>

Output:

Program 2: The program below demonstrates the working of gmp_root() when numeric string is passed as an argument.

php

<?php
// PHP program to calculate the 
// integer part of N-th root of  
// a GMP number 
 
// GMP number as arguments 
$num = "9"; 
$n = 3;
 
// function calculates the pow raised to 
// number modulo mod  
     
// integer part of cubic root of 9
$root = gmp_root($num, $n);  
 
echo $root;
?>

Output:

Program 3: Program to find the integer part of a square root of a number.

php

<?php
// PHP program to calculate the 
// integer part of N-th root of  
// a GMP number 
 
// GMP number as arguments 
$num = "25"; 
$n = 2;
 
// function calculates the pow raised to 
// number modulo mod  
     
// integer part of square root of 25
$root = gmp_root($num, $n);  
 
echo $root;
?>

Output:

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

Whether you’re preparing for your first job interview or aiming to upskill in this ever-evolving tech landscape, zambiatek Courses are your key to success. We provide top-quality content at affordable prices, all geared towards accelerating your growth in a time-bound manner. Join the millions we’ve already empowered, and we’re here to do the same for you. Don’t miss out – check it out now!