/** * Validate * * Determines if the UPC value is valid, IE the check digit * matches. * * @param string $upc UPC to be inspected * @throws UpcException If the UPC value is less than 12 digits. * @return Returns TRUE if the UPC matches the UPC standard, * FALSE otherwise. */ public static function validate($upc) { $upc = trim($upc); $length = strlen($upc); // Attempt to validate a UPC-E Code if ($length > 12) { throw new UpcException\UpcException('UPC Value is more than 12 digits in length. UPC: ' . $upc . ' ( length = ' . strlen($upc) . ')', UpcException\UpcException::CODE_INVALID); } if ($length < 12) { throw new UpcException\UpcException('UPC Value is less than 12 digits in length. Try using UpcEvalidator. UPC: ' . $upc . ' ( length = ' . strlen($upc) . ')', UpcException\UpcException::CODE_INVALID); } if (!is_numeric($upc)) { throw new UpcException\UpcException('UPC Value can only contain numbers. UPC: ' . $upc, UpcException\UpcException::CODE_CONTAINS_CHARACTERS); } // If the UPC is 6, 7 or 8 digits, validate as UPC-E $checkDigit = UpcValidator::getCheckDigit($upc); return intval($upc[$length - 1]) === intval($checkDigit); }
/** * Epand 8 * * Expand a 8-digit UPC-E code to UPC-A 12 digit code. * The first digit becomes the UPC-E Check Number and then the * first and last digits are stripped. The last digit is then * re-appended as the check digit; * * @param string $upc UPC-E Code to expand * @return Returns the expanded UPC code */ private static function expand8($upc) { // Get literal first and last digits $first = substr($upc, 0, 1); $last = substr($upc, 7, 1); // Strip UPC to middle 6 digits $upc = substr($upc, 1, 6); // Create UPC from 6 digit value $upc = UpcEExpander::createUpcA($upc, $last, $last); // Get new check digit and append $checkDigit = \ProductValidator\UpcValidator\UpcValidator::getCheckDigit($upc); $upc = substr($upc, 0, 11) . $checkDigit; return $upc; }
/** * Check UPC Code * * @param string $code UPC-E Code to validate * @return Returns TRUE if the UPC validates, otherwise FALSE */ public static function checkUpcA($code) { return UpcValidator\UpcValidator::validate($code); }