注：Yaf 里的init 在下默认理解为__construct()

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();     } }

与以下写法有什么不同吗？

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();     } }

在下小菜鸟一枚，希望有个良好的编程习惯，有些基础不踏实 还望指点