gmp_gcd

Calculate GCD (PHP 4 >= 4.0.4, PHP 5)
resource gmp_gcd ( resource a, resource b )

Calculate greatest common divisor of a and b. The result is always positive even if either of, or both, input operands are negative.

例 673. gmp_gcd() example

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

The printout of the above program will be:

3