function ISBN_classifier in ISBN Field 6

File

./isbn.inc, line 432

Code

function ISBN_classifier($clean) {
  if (strlen($clean) == 13 && substr($clean, 0, 3) == '978' && bad_ISN_char_count($clean) == 0) {
    return "bookland";
  }
  else {
    return ISN_classifier($clean, 10);
  }
}