Sylius\Bundle\PaymentBundle\Form\Type\CreditCardType::getMonthChoices PHP Method

    private function getMonthChoices()
    {
        $monthChoices = [];
        foreach (range(1, 12) as $month) {
            $monthChoices[str_pad($month, 2, 0, STR_PAD_LEFT)] = $month;
        }
        return $monthChoices;
    }