/**
* Counts the digit for the given ISBN number. Works with both
* ISBN-10 and ISBN-13.
* @param string $identifier ISBN which check digit needs to be calculated
* @return character check digit of the given ISBN
*/
public function getCheckDigit($identifier)
{
// Include ISBN helper class
require_once JPATH_ADMINISTRATOR . '/components/com_isbnregistry/helpers/publisherisbnrange.php';
// Calculate check digit - use same algorithm that's used with ISBN-13
return PublishersisbnrangeHelper::countIsbnCheckDigit($identifier);
}
/**
* Counts the digit for the given ISBN number. Works with both
* ISBN-10 and ISBN-13.
* @param string $identifier ISBN which check digit needs to be calculated
* @return character check digit of the given ISBN
*/
public function getCheckDigit($identifier)
{
// Include helper class
require_once JPATH_ADMINISTRATOR . '/components/com_isbnregistry/helpers/publisherisbnrange.php';
// Calculate check digit
return PublishersisbnrangeHelper::countIsbnCheckDigit($identifier);
}