Erkan IŞIK
39 lines
787 B
PHP
39 lines
787 B
PHP
<?php namespace ZN\Validation\CreditCard;
|
|
/**
|
|
* ZN PHP Web Framework
|
|
*
|
|
* "Simplicity is the ultimate sophistication." ~ Da Vinci
|
|
*
|
|
* @package ZN
|
|
* @license MIT [http://opensource.org/licenses/MIT]
|
|
* @author Ozan UYKUN [ozan@znframework.com]
|
|
*/
|
|
|
|
class LuhnAlgorithm implements LuhnAlgorithmInterface
|
|
{
|
|
/**
|
|
* Protected luhn algorithm check
|
|
*
|
|
* @param string $number
|
|
*
|
|
* @return string
|
|
*/
|
|
public static function check(?string $number = NULL)
|
|
{
|
|
$table =
|
|
[
|
|
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
|
|
[0, 2, 4, 6, 8, 1, 3, 5, 7, 9]
|
|
];
|
|
|
|
$total = 0; $transform = 0;
|
|
|
|
for( $i = strlen($number ?? '') - 1; $i >= 0; $i-- )
|
|
{
|
|
$total += $table[$transform++ & 0x1][$number[$i]];
|
|
}
|
|
|
|
return $total % 10 === 0;
|
|
}
|
|
}
|