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   $gcd = gmp_gcd("12", "21"); echo gmp_strval($gcd) . "\n";   ?> |
Output:
3
Program 2:
<?php   $gcd = gmp_gcd("15", "30"); echo gmp_strval($gcd) . "\n";   ?> |
Output:
15
