/**
* Test Invalid ISBN-10.
*
* @return void
*/
public function testInvalidISBN10()
{
// Invalid ISBN-10:
$isbn = new ISBN('2314346323');
$this->assertFalse($isbn->get10());
$this->assertFalse($isbn->get13());
$this->assertFalse($isbn->isValid());
}
/**
* Return the first valid ISBN found in the record (favoring ISBN-10 over
* ISBN-13 when possible).
*
* @return mixed
*/
public function getCleanISBN()
{
// Get all the ISBNs and initialize the return value:
$isbns = $this->getISBNs();
$isbn13 = false;
// Loop through the ISBNs:
foreach ($isbns as $isbn) {
// Strip off any unwanted notes:
if ($pos = strpos($isbn, ' ')) {
$isbn = substr($isbn, 0, $pos);
}
// If we find an ISBN-10, return it immediately; otherwise, if we find
// an ISBN-13, save it if it is the first one encountered.
$isbnObj = new ISBN($isbn);
if ($isbn10 = $isbnObj->get10()) {
return $isbn10;
}
if (!$isbn13) {
$isbn13 = $isbnObj->get13();
}
}
return $isbn13;
}
