$this->resultDB = $this->dbh->prepare("SELECT {$this->params} FROM `order` WHERE `id` = :orderID");вместо этого треша надо использовать обертки.
$this->resultDB->bindParam(':orderID', $this->orderID);
$this->resultDB->execute();
$this->resultDB = $this->resultDB->fetch(PDO::FETCH_OBJ);