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<?php |
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namespace Mbright\Validation\Rule\Validate; |
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class CreditCard implements ValidateRuleInterface |
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{ |
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/** |
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* Validates the value as a credit card number. |
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* |
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* @param object $subject The subject to be filtered. |
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* @param string $field The subject field name. |
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* |
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* @return bool True if valid, false if not. |
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*/ |
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public function __invoke($subject, string $field): bool |
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{ |
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// get the value; remove spaces, dashes, and dots |
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$value = str_replace([' ', '-', '.'], '', (string) $subject->$field); |
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// is it composed only of digits? |
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if (!ctype_digit($value)) { |
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return false; |
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} |
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// luhn mod-10 algorithm: https://gist.github.com/1287893 |
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$sumTable = [ |
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[0, 1, 2, 3, 4, 5, 6, 7, 8, 9], |
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[0, 2, 4, 6, 8, 1, 3, 5, 7, 9], |
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]; |
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$sum = 0; |
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$flip = 0; |
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for ($i = strlen($value) - 1; $i >= 0; $i--) { |
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$sum += $sumTable[$flip++ & 0x1][$value[$i]]; |
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} |
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return $sum % 10 === 0; |
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} |
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} |
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MarcusFulbright /
Validate
