listVersionNumbers() абстрактный публичный Метод

Returns all version numbers for the given $contentId.
abstract public listVersionNumbers ( mixed $contentId ) : int[]
$contentId mixed
Результат int[]
 /**
  * Returns all version numbers for the given $contentId
  *
  * @param mixed $contentId
  *
  * @return int[]
  */
 public function listVersionNumbers($contentId)
 {
     try {
         return $this->innerGateway->listVersionNumbers($contentId);
     } catch (DBALException $e) {
         throw new RuntimeException('Database error', 0, $e);
     } catch (PDOException $e) {
         throw new RuntimeException('Database error', 0, $e);
     }
 }