PHP 觀察者模式

 Observed   
     ->_observers = 
      attach(SplObserver ->_observers->attach(
      detach(SplObserver ->_observers->detach(
     (->_observers  ->showMessage(
      setName(->_name = ->
      ->
      setAge(->age = (->_observers  ->showAge(->_name,->
 Observer 
      showMessage(SplSubject  = ->(==='admin' '您好, ',,'歡迎您進入管理後台<br/>' "你好, '' 你已經被添加到了用戶列表<br/>"
      update(SplSubject 
      showAge(, "<script>alert(' 的年齡是: ')</script>" =  Observed();  
 =  Observer(); 
->attach();
->setName('張三'); 
->setName('admin'->setAge(24);