/**
* Guesses ISBN version of passed string
*
* Note: This is not Validation. To get the validated
* version of an ISBN Number use ISBN::validate();
*
* @param string $isbn ISBN Number to guess Version of
*
* @return integer|false Version Value or false if failed
*
* @see validate();
*/
function guessVersion($isbn)
{
$r = ISBN::_isbnVersionGuess($isbn);
return $r;
}
