public function getPort($id) {
    $sql = "SELECT c.id, c.port as number, d.type, d.spec, d.transfer as speed
            FROM details a
            LEFT JOIN port_to_drive b ON a.drive_id = b.drive_id
            LEFT JOIN port c ON b.port_id = c.id
            LEFT JOIN port_type d ON c.port_type = d.id
            WHERE a.id = $id";

    $stmt = $this->db->query($sql);

    return $stmt->fetchObject();
}

object(stdClass)[116]
public 'id' => null
public 'number' => null
public 'type' => null
public 'spec' => null
public 'speed' => null

PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
PDO::ATTR_EMULATE_PREPARES => false