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<?php |
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/* |
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* This file is part of Respect/Validation. |
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* |
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* (c) Alexandre Gomes Gaigalas <[email protected]> |
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* |
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* For the full copyright and license information, please view the "LICENSE.md" |
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* file that was distributed with this source code. |
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*/ |
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namespace Respect\Validation\Rules; |
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use Respect\Validation\Exceptions\ComponentException; |
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class CreditCard extends AbstractRule |
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{ |
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const AMERICAN_EXPRESS = 'American Express'; |
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const DINERS_CLUB = 'Diners Club'; |
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const DISCOVER = 'Discover'; |
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const JCB = 'JCB'; |
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const MASTERCARD = 'MasterCard'; |
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const VISA = 'Visa'; |
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/** |
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* @var string |
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*/ |
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public $brand; |
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/** |
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* @var array |
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*/ |
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private $brands = [ |
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self::AMERICAN_EXPRESS => '/^3[47]\d{13}$/', |
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self::DINERS_CLUB => '/^3(?:0[0-5]|[68]\d)\d{11}$/', |
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self::DISCOVER => '/^6(?:011|5\d{2})\d{12}$/', |
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self::JCB => '/^(?:2131|1800|35\d{3})\d{11}$/', |
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self::MASTERCARD => '/^5[1-5]\d{14}$/', |
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self::VISA => '/^4\d{12}(?:\d{3})?$/', |
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]; |
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/** |
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* @param string $brand Optional credit card brand. |
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*/ |
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public function __construct($brand = null) |
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{ |
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if (null !== $brand && !isset($this->brands[$brand])) { |
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$brands = implode(', ', array_keys($this->brands)); |
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$message = sprintf('"%s" is not a valid credit card brand (Available: %s).', $brand, $brands); |
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throw new ComponentException($message); |
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} |
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$this->brand = $brand; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function validate($input) |
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{ |
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$input = preg_replace('([^0-9])', '', $input); |
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if (empty($input)) { |
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return false; |
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} |
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if (!$this->verifyMod10($input)) { |
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return false; |
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} |
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return $this->verifyBrand($input); |
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} |
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/** |
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* Returns whether the input matches the Luhn algorithm or not. |
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* |
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* @param string $input |
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* |
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* @return bool |
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*/ |
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private function verifyMod10($input) |
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{ |
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$sum = 0; |
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$input = strrev($input); |
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for ($i = 0; $i < strlen($input); ++$i) { |
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$current = substr($input, $i, 1); |
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if ($i % 2 == 1) { |
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$current *= 2; |
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if ($current > 9) { |
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$firstDigit = $current % 10; |
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$secondDigit = ($current - $firstDigit) / 10; |
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$current = $firstDigit + $secondDigit; |
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} |
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} |
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$sum += $current; |
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} |
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return $sum % 10 == 0; |
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} |
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/** |
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* Returns whether the input matches the defined credit card brand or not. |
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* |
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* @param string $input |
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* |
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* @return bool |
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*/ |
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private function verifyBrand($input) |
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{ |
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if (null === $this->brand) { |
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return true; |
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} |
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$pattern = $this->brands[$this->brand]; |
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return preg_match($pattern, $input) > 0; |
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} |
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} |
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Respect /
Validation
