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<?php |
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namespace IsoCodes; |
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/** |
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* Class Isbn. |
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* |
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* @author Sullivan Senechal <[email protected]> |
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*/ |
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class Isbn implements IsoCodeInterface |
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{ |
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/** |
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* @param string $isbn |
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* @param int|null $type 10 or 13. Leave empty for both. |
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* |
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* @return bool |
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*/ |
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public static function validate($isbn, $type = null) |
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{ |
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if ($type !== null && !in_array($type, [10, 13], true)) { |
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throw new \InvalidArgumentException('ISBN type option must be 10 or 13'); |
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} |
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$isbn = str_replace(' ', '', $isbn); |
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$isbn = str_replace('-', '', $isbn); // this is a dash |
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$isbn = str_replace('‐', '', $isbn); // this is an authentic hyphen |
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if ($type === 10) { |
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return self::validateIsbn10($isbn); |
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} |
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if ($type === 13) { |
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return self::validateIsbn13($isbn); |
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} |
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return self::validateIsbn10($isbn) || self::validateIsbn13($isbn); |
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} |
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private static function validateIsbn10($isbn10) |
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{ |
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if (strlen($isbn10) != 10) { |
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return false; |
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} |
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if (!preg_match('/\\d{9}[0-9xX]/i', $isbn10)) { |
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return false; |
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} |
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$check = 0; |
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for ($i = 0; $i < 10; ++$i) { |
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if ($isbn10[$i] == 'X') { |
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$check += 10 * intval(10 - $i); |
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} |
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$check += intval($isbn10[$i]) * intval(10 - $i); |
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} |
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return $check % 11 == 0; |
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} |
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private static function validateIsbn13($isbn13) |
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{ |
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if (strlen($isbn13) != 13 || !ctype_digit($isbn13)) { |
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return false; |
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} |
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return Luhn::check($isbn13, 13, false); |
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} |
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} |
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ronanguilloux /
IsoCodes
