PHP | gmp_gcd() Function

The gmp_gcd() is an in built function in PHP which is used to calculate the GCD of 2 GMP numbers (GNU Multiple Precision : For large numbers). Syntax:

gmp_gcd ( $num1, $num2 )

Parameters: This function accepts two GMP numbers $num1 and $num2 as parameters. This function calculates the GCD of these two numbers. Return Value: This function returns a positive GMP number which is the GCD of $num1 and $num2. Examples:

Input : gmp_gcd("12", "21")
Output : 3

Input : gmp_gcd("15", "30")
Output : 15

Explanation: In the above example gmp_gcd() function calculates the greatest common divisor of num1 and num2. The result is always positive even if either of, or both, input operands are negative. Below programs illustrate the gmp_gcd() function in PHP. Program 1: PHP

<?php

$gcd = gmp_gcd("12", "21");
echo gmp_strval($gcd) . "\n";

?>

Output:

3

Program 2: PHP

<?php

$gcd = gmp_gcd("15", "30");
echo gmp_strval($gcd) . "\n";

?>

Output:

15

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