GusDeCooL\Cryptography\Algorithm\LuhnAlgorithm

Complexity

Total Complexity

2

Size/Duplication

Total Lines	23
Duplicated Lines	0 %

Coupling/Cohesion

Components	0
Dependencies	0

Test Coverage

Coverage

100%

Importance

Changes

0

1 Method

Rating	Name	Duplication	Size	Complexity
A	isValid()	0	16	2

<?php

namespace GusDeCooL\Cryptography\Algorithm;

/**
 * Luhn Algorithm
 *
 * @package GusDeCooL\Cryptography\Algorithm\Algorithm
 * @author Budi Arsana <gusdecool@gmail.com>
 */
class LuhnAlgorithm
{
    /**
     * @param string $number
     * @return bool
     */
    public function isValid($number)
    {
        settype($number, 'string');
        $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 ($i = strlen($number) - 1; $i >= 0; $i--) {
            $sum += $sumTable[$flip++ % 2][$number[$i]];
        }

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