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48405271c5The `{{name}}` placeholder could represent different things depending on
the state of the Result, and referring to it as `{{name}}` seems
arbitrary. This commit changes it to `{{subject}}`, which is much more
generic and it describes well what that placeholder can mean.
52 lines
1.2 KiB
PHP
52 lines
1.2 KiB
PHP
<?php
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/*
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* Copyright (c) Alexandre Gomes Gaigalas <alganet@gmail.com>
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* SPDX-License-Identifier: MIT
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*/
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declare(strict_types=1);
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namespace Respect\Validation\Rules;
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use Attribute;
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use Respect\Validation\Message\Template;
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use Respect\Validation\Rules\Core\Simple;
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use function array_map;
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use function count;
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use function str_split;
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/** @see https://en.wikipedia.org/wiki/Luhn_algorithm */
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#[Attribute(Attribute::TARGET_PROPERTY | Attribute::IS_REPEATABLE)]
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#[Template(
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'{{subject}} must be a valid Luhn number',
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'{{subject}} must not be a valid Luhn number',
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)]
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final class Luhn extends Simple
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{
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public function isValid(mixed $input): bool
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{
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if (!(new Digit())->evaluate($input)->hasPassed) {
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return false;
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}
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$sum = 0;
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$digits = array_map('intval', str_split((string) $input));
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$numDigits = count($digits);
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$parity = $numDigits % 2;
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for ($i = 0; $i < $numDigits; ++$i) {
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$digit = $digits[$i];
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if ($parity == $i % 2) {
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$digit <<= 1;
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if (9 < $digit) {
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$digit -= 9;
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}
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}
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$sum += $digit;
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}
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return $sum % 10 == 0;
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}
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}
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