class Controller
{
    protected $db;
    private $article;
    private $nav;

    public function __construct($db)
    {
        $this->db = $db;
        $this->article = new Article($this->db);
        $this->nav = new Nav($this->db);
    }

    public function render($template)
    {
        var_dump($this->article->getRow());
        var_dump($this->nav->getRows());
    }

}

class Controller
{
    private $container;

    public function __construct()
    {
    }

    public function render($container,$template)
    {
        $this->container = $container;
        var_dump($this->container->getArticle($url = 'home'));
        var_dump($this->container->getNav());
    }

}

class Container
{
    protected $db;
    private $article;
    private $nav;

    public function __construct($db)
    {
       $this->db = $db;
    }

    public function setArticle()
    {
        if (is_null($this->article))
        {
            $this->article = new Article($this->db);
        }
        return $this->article;
    }

    public function setNav()
    {
        if (is_null($this->nav))
        {
            $this->nav = new Nav($this->db);
        }
        return $this->nav;
    }

    public function getArticle($url)
    {
        return $this->setArticle()->getRow($url);
    }

    public function getNav()
    {
        return $this->setNav()->getRows();
    }
}

class Article
{
    public function __construct($db)
    {

    }

    public function getRow($url)
    {
        return "row 1";
    }
}

class nav
{
    public function __construct($db)
    {

    }

    public function getRows()
    {
        return "rows nav";
    }
}

$db = 'pdo connection';
$template = 'template.phtml';
$container = new Container($db);
$controller = new Controller();
$controller->render($container,$template);