Does not work for ISBN 13 and UPC codes about barcode-validator HOT 5 CLOSED

: Ok I think I have a fix for this. https://github.com/imelgrat/barcode-validator/blob/b8fb06789875850f5c34c505f137bd625d36c0e5/src/barcode-validator.php#L48 According to https://www.gs1.org/services/how-calculate-check-digit-manually <http://url> the multiplier is based on code length. If you change this method to: protected static function calculateEANCheckDigit($code){ // Split odd-/even-positioned digits (except the last one). preg_match_all('/(\d)(\d){0,1}/', $code, $digits); $oddDigits = array_sum($digits[1]); $evenDigits = array_sum($digits[2]); if (strlen($code) % 2 == 0) { $evenDigits *= 3; } else { $oddDigits *= 3; } $sum = $oddDigits + $evenDigits; // nearest equal or higher multiple of ten $multiple = ceil($sum / 10) * 10; $checkDigit = $multiple - $sum; return $checkDigit;} I have tested this on the codes submitted in this issue thread and it seems to fix the issue. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#2?email_source=notifications&email_token=AA5PTPXWY6COCUWN2DPEOBDQGWIXPA5CNFSM4FPJLIRKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD5JDIQQ#issuecomment-525481026>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AA5PTPSML2MSLC3PEW2RQPTQGWIXPANCNFSM4FPJLIRA> .