divide.md

function divide($a, $b)
{
    $divisor = $b;
    if ($b > $a) {
        return 0;
    }

    $res = 1;
    while (($b + $b) <= $a) {
        $b += $b;
        $res += $res;
    }

    return $res + divide($a - $b, $divisor);
}