Credit Card Check Class

CreditCardCheck.php

<?php

class CreditCardCheck
{
    public function validateCreditcard_number($cc_num)
    {
        $credit_card_number = $this->sanitize($cc_num);
        // Get the first digit
        $data        = array();
        $firstnumber = substr($credit_card_number, 0, 1);
        // Make sure it is the correct amount of digits. Account for dashes being present.
        switch ($firstnumber) {
            case 3:
                $data['card_type'] = "American";
                if (!preg_match('/^3\d{3}[ \-]?\d{6}[ \-]?\d{5}$/', $credit_card_number)) {
                    //return 'This is not a valid American Express card number';
                    $data['status'] = 'false';

                    return $data;
                }
                break;
            case 4:
                $data['card_type'] = "VISA";
                if (!preg_match('/^4\d{3}[ \-]?\d{4}[ \-]?\d{4}[ \-]?\d{4}$/', $credit_card_number)) {
                    //return 'This is not a valid Visa card number';
                    $data['status'] = 'false';

                    return $data;
                }
                break;
            case 5:
                $data['card_type'] = "MASTERCARD";
                if (!preg_match('/^5\d{3}[ \-]?\d{4}[ \-]?\d{4}[ \-]?\d{4}$/', $credit_card_number)) {
                    //return 'This is not a valid MasterCard card number';
                    $data['status'] = 'false';

                    return $data;
                }
                break;
            case 6:
                $data['card_type'] = "Discover";
                if (!preg_match('/^6011[ \-]?\d{4}[ \-]?\d{4}[ \-]?\d{4}$/', $credit_card_number)) {
                    //return 'This is not a valid Discover card number';
                    $data['status'] = 'false';

                    return $data;
                }
                break;
            default:
                //return 'This is not a valid credit card number';
                $data['card_type'] = "Invalid";
                $data['status']    = 'false';

                return $data;
        }
        // Here's where we use the Luhn Algorithm
        $credit_card_number = str_replace('-', '', $credit_card_number);
        $map                = array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 2, 4, 6, 8, 1, 3, 5, 7, 9);
        $sum                = 0;
        $last               = strlen($credit_card_number) - 1;
        for ($i = 0; $i <= $last; $i++) {
            $sum += $map[$credit_card_number[$last - $i] + ($i & 1) * 10];
        }
        if ($sum % 10 != 0) {
            //return 'This is not a valid credit card number';
            $data['status'] = 'false';

            return $data;
        }
        // If we made it this far the credit card number is in a valid format
        $data['status'] = 'true';

        return $data;
    }

    public function validateCreditCardExpirationDate($mon, $yr)
    {
        $month = $this->sanitize($mon);
        $year  = $this->sanitize($yr);
        if (!preg_match('/^\d{1,2}$/', $month)) {
            return 'false'; // The month isn't a one or two digit number
        } else if (!preg_match('/^\d{4}$/', $year)) {
            return 'false'; // The year isn't four digits long
        } else if ($year < date("Y")) {
            return 'false'; // The card is already expired
        } else if ($month < date("m") && $year == date("Y")) {
            return 'false'; // The card is already expired
        }

        return 'true';
    }

    public function validateCVV($cc_num, $cc_cvv)
    {
        $cardNumber = $this->sanitize($cc_num);
        $cvv        = $this->sanitize($cc_cvv);
        // Get the first number of the credit card so we know how many digits to look for
        $firstnumber = (int)substr($cardNumber, 0, 1);
        if ($firstnumber === 3) {
            if (!preg_match("/^\d{4}$/", $cvv)) {
                // The credit card is an American Express card but does not have a four digit CVV code
                return 'false';
            }
        } else if (!preg_match("/^\d{3}$/", $cvv)) {
            // The credit card is a Visa, MasterCard, or Discover Card card
            //but does not have a three digit CVV code
            return 'false';
        }

        return 'true';
    }

    function sanitize($value)
    {
        return trim(strip_tags($value));
    }
}