public function generateNumber(int $bonus, int $multiplier): int
{
    if (mt_rand(0, 1) === 1) {
        $number = 10;
    } else {
        $bonus *= $multiplier;
        $number = 20 + $bonus;
    }

    return $number;
}

public function generateNumber(int $bonus, int $multiplier): int
{
    if (mt_rand(0, 1) === 1) {
        return 10;
    }

    return 20 + $bonus;
}

public function generateNumber(int $bonus, int $multiplier): int
{
    if (mt_rand(0, 1) === 1) {
        return 10;
    }
    $bonus *= $multiplier;

    return 20 + $bonus;
}