MongoClient::dropDB PHP Метод

    public function dropDB($db)
    {
        throw new Exception('Not Implemented');
    }

 /**
  * @deprecated
  * @see MongoClient#dropDB
  */
 public function dropDB($db)
 {
     if (empty($db)) {
         $db = $this->dbname;
     }
     return parent::dropDB($db);
 }