Is there any difference between the init method in Yaf that instantiates multiple classes at the beginning and stores them in private properties and the need to create a new class again?

Note: init in Yaf is understood by default as __construct()

<code>class Order{
    private $extend     = '';
    private $order      = '';
    public function init(){
        parent::init();
        $this->order      = new Order();
        $this->extend     = new OrderEx();
    }

    public function listAction(){
        $this->order->public();
    }
    
    public function makeAction(){
        $this->extend->public();
    }
}</code>

Is

any different from the following writing?

<code>class Order{
    private $extend     = '';
    private $order      = '';
    public function init(){
        parent::init();
    }

    public function listAction(){
        $order = new Order();
        $order->public();
    }
    
    public function makeAction(){
        $extend= new extend();
        $extend->public();
    }
}</code>

I’m a newbie, I hope to have good programming habits, but some basics are not solid, so I hope you can give me some advice