/**
* 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);
}
