find the greatest common divisor of a list of numbers in php

main.php
/**
 * Calculate greatest common divisor of a list of numbers.
 *
 * @param array $numbers
 * @return int
 */
function gcd(array $numbers) : int {
    $result = $numbers[0];
    $count = count($numbers);
    for($i = 1; $i < $count; $i++) {
        $result = gcdTwo($result, $numbers[$i]);
    }
    return $result;
}

/**
 * Calculate greatest common divisor of two numbers.
 *
 * @param int $a
 * @param int $b
 * @return int
 */
function gcdTwo(int $a, int $b) : int {
    while($b) {
        $t = $b;
        $b = $a % $b;
        $a = $t;
    }
    return $a;
}
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