gmp_gcd

(PHP 4 >= 4.0.4, PHP 5)

gmp_gcd — Calculate GCD

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.

a: It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.
b: It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

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";
?>

上例将输出：