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<?php |
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/** |
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* This file is part of Dimtrovich/Validation. |
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* |
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* (c) 2023 Dimitri Sitchet Tomkeu <[email protected]> |
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* |
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* For the full copyright and license information, please view |
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* the LICENSE file that was distributed with this source code. |
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*/ |
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namespace Dimtrovich\Validation\Rules; |
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use Rakit\Validation\Rule; |
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class Isbn extends Ean |
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{ |
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/** |
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* {@inheritDoc} |
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*/ |
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public function fillParameters(array $params): Rule |
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{ |
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if (empty($params)) { |
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$params = [10, 13]; |
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} |
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return parent::fillParameters($params); |
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} |
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/** |
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* Check if the current value is a valid International Standard Book Number (ISBN). |
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* |
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* @see https://en.wikipedia.org/wiki/International_Standard_Book_Number |
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* |
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* @credit <a href="https://github.com/Intervention/validation">Intervention/validation - \Intervention\Validation\Rules\Isbn</a> |
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* |
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* @param mixed $value |
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*/ |
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public function check($value): bool |
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{ |
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// normalize value |
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$value = preg_replace('/[^0-9x]/i', '', $value); |
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if (! $this->hasAllowedLength($value)) { |
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return false; |
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} |
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switch (strlen($value)) { |
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case 10: |
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return $this->shortChecksumMatches($value); |
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case 13: // isbn-13 is a subset of ean-13 |
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return preg_match('/^(978|979)/', $value) && parent::checksumMatches($value); |
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} |
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return false; |
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} |
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/** |
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* Determine if checksum for ISBN-10 numbers is valid |
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*/ |
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private function shortChecksumMatches(string $value): bool |
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{ |
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return $this->getShortChecksum($value) % 11 === 0; |
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} |
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/** |
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* Calculate checksum of short ISBN numbers |
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*/ |
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private function getShortChecksum(string $value): int |
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{ |
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$checksum = 0; |
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$multiplier = 10; |
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foreach (str_split($value) as $digit) { |
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$digit = strtolower($digit) === 'x' ? 10 : (int) $digit; |
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$checksum += $digit * $multiplier; |
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$multiplier--; |
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} |
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return $checksum; |
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} |
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} |
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dimtrovich /
validation
