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<?php namespace Faker\Calculator; /** * Utility class for validating EAN-8 and EAN-13 numbers */ class Ean { /** * @var string EAN validation pattern */ public const PATTERN = '/^(?:\d{8}|\d{13})$/'; /** * Computes the checksum of an EAN number. * * @see https://en.wikipedia.org/wiki/International_Article_Number * * @param string $digits * * @return int */ public static function checksum($digits) { $sequence = (strlen($digits) + 1) === 8 ? [3, 1] : [1, 3]; $sums = 0; foreach (str_split($digits) as $n => $digit) { $sums += ((int) $digit) * $sequence[$n % 2]; } return (10 - $sums % 10) % 10; } /** * Checks whether the provided number is an EAN compliant number and that * the checksum is correct. * * @param string $ean An EAN number * * @return bool */ public static function isValid($ean) { if (!preg_match(self::PATTERN, $ean)) { return false; } return self::checksum(substr($ean, 0, -1)) === (int) substr($ean, -1); } }