function gcd(...$numbers) {
if (count($numbers) > 2) {
return array_reduce($numbers, 'gcd');
}
$r = $numbers[0] % $numbers[1];
return $r === 0 ? abs($numbers[1]) : gcd($numbers[1], $r);
}
gcd(8, 36); // 4
gcd(12, 8, 32); // 4
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