Mbright\Validation\Rule\Validate\CreditCard

Complexity

Total Complexity

3

Size/Duplication

Total Lines	34
Duplicated Lines	0 %

Test Coverage

Coverage

100%

Importance

Changes

0

1 Method

Rating	Name	Duplication	Size	Complexity
A	__invoke()	0	24	3

<?php

namespace Mbright\Validation\Rule\Validate;

class CreditCard implements ValidateRuleInterface
{
    /**
     * Validates the value as a credit card number.
     *
     * @param object $subject The subject to be filtered.
     * @param string $field The subject field name.
     *
     * @return bool True if valid, false if not.
     */
    public function __invoke($subject, string $field): bool
    {
        // get the value; remove spaces, dashes, and dots
        $value = str_replace([' ', '-', '.'], '', (string) $subject->$field);

        // is it composed only of digits?
        if (!ctype_digit($value)) {
            return false;
        }

        // luhn mod-10 algorithm: https://gist.github.com/1287893
        $sumTable = [
            [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
            [0, 2, 4, 6, 8, 1, 3, 5, 7, 9],
        ];

        $sum = 0;
        $flip = 0;

        for ($i = strlen($value) - 1; $i >= 0; $i--) {
            $sum += $sumTable[$flip++ & 0x1][$value[$i]];
        }

        return $sum % 10 === 0;
    }
}