(PHP 4 >= 4.0.4, PHP 5)
gmp_gcd — Calculate GCD
Calculate greatest common divisor of a and b . The result is always positive even if either of, or both, input operands are negative.
A positive GMP number that divides into both a and b .
Example #1 gmp_gcd() example
<?php
$gcd = gmp_gcd("12", "21");
echo gmp_strval($gcd) . "\n";
?>
위 예제의 출력:
3