PHP | gmp_root() Function
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
$num = gmp_init( "1001" , 2);
$n = 3;
$root = gmp_root( $num , $n );
echo gmp_strval( $root , 2);
?>
|
Output:
10
Program 2: The program below demonstrates the working of gmp_root() when numeric string is passed as an argument.
php
<?php
$num = "9" ;
$n = 3;
$root = gmp_root( $num , $n );
echo $root ;
?>
|
Output:
2
Program 3: Program to find the integer part of a square root of a number.
php
<?php
$num = "25" ;
$n = 2;
$root = gmp_root( $num , $n );
echo $root ;
?>
|
Output:
5
Reference:
http://php.net/manual/en/function.gmp-root.php
Last Updated :
30 Oct, 2020
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