(PHP 4 >= 4.0.4, PHP 5, PHP 7)
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.
aEither a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.
bEither a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided 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";
?>
The above example will output:
3