在Codeigniter中通過ajax調用對象引用

Question

我想通過單獨的AJAX調用使用Codeigniter編寫的同一控制器中調用不同的方法，並在其中一個調用中創建第三個庫的對象，並稍後訪問同一個對象（也自動加載Session庫）在第二個方法，同時使第二AJAX調用：

JavaScript有2個獨立的AJAX調用：

 $.post('http://mysite.com/UserController/controllerA',{Param1:x,Param2:y}); 
    $.post('http://mysite.com/UserController/controllerB'); 

而且控制器的樣子：

 require_once 'FILEPATH/Thirdlibrary.php';   
    class UserController extends CI_Controller { 

    protected $service; 

    public controllerA{ 
     $varA = $this->input->post('Param1'); 
     $varB = $this->input->post('Param2'); 

     $this->service = new ThirdLibray($varA,$varB); 

     $this->service->startCall();//Thirdlibrary has method startCall() and stopCall 
    } 

    public controllerB{ 
     //I want to refer to the same object $this->service here 

     $this->service->stopCall(); 
    } 

現在我知道，PHP每次重新初始化的對象其加載/訪問，我怎麼能做出這樣work.How到ovecome這樣的錯誤：

Call to a member function stopCall() on a non-object 

（使所有的努力後，搜索查詢這裏編碼）

Answer 1

將對象存儲到會話中並使用它。

require_once 'FILEPATH/Thirdlibrary.php';   
class UserController extends CI_Controller { 

protected $service; 

public controllerA{ 
    $varA = $this->input->post('Param1'); 
    $varB = $this->input->post('Param2'); 

    if($this->session->userdata('lib_service')) 
    { 
     $this->service =$this->session->userdata('lib_service'); 
    } 
    else 
    { 
     $this->service = new ThirdLibray($varA,$varB); 
    } 
    $this->service->startCall();//Thirdlibrary has method startCall() and stopCall 
    $this->session->set_userdata('lib_service',$this->service); // Why i am saving the object here?, startCall may update some object properties, so that-also will be saved. Otherwise you can have this line in the else part above, after object creation. 
} 

public controllerB{ 
    //I want to refer to the same object $this->service here 
    if($this->session->userdata('lib_service')) 
    { 
     $this->service =$this->session->userdata('lib_service'); 
     $this->service->stopCall(); 
     // Here after stop if you don't want the object, you can clear from session. 
    } 

} 

Answer 2

你可以嘗試使用單例模式爲PHP。這是爲您的情況實施它的基本代碼，但我不確定它適用於您。讓我們嘗試：

1. 首先創建一個wrraped類的第三方庫：ThirdlibraryWrapped.php，你可以看到更多的單身Best practice on PHP singleton classes

   類ThirdLibraryWrapped {

   public ThirdLibray thirdLibrary; 
   
   public static function Instance($param1=null,$param2 = null) 
   { 
       static $inst = null; 
       if ($inst === null) { 
        $inst = new ThirdlibraryWrapped($param1,$param2); 
       } 
       return $inst; 
   } 
   
   private function __construct($param1,$param2) 
   { 
       if($param1!=null && $param2 != null) 
         thirdLibrary = new ThirdLibrary($param1,$param2); 
       else 
         //default constructor of thirdLibrary 
         thirdLibrary = new ThirdLibrary(); 
   }} 
   

2. 爲您控制器代碼：

   require_once 'FILEPATH/ThirdlibraryWrapped.php';   
   class UserController extends CI_Controller { 
   protected $service; 
   public controllerA{ 
       $varA = $this->input->post('Param1'); 
       $varB = $this->input->post('Param2'); 
   
       $this->service = ThirdlibraryWrapped::Instance($varA,$varB); 
   
       $this->service->thirdLibrary->startCall();//Thirdlibrary has method startCall() and stopCall 
   } 
   
   public controllerB{ 
       //I want to refer to the same object $this->service here 
       $this->service = ThirdlibraryWrapped::Instance(); 
       $this->service->thirdLibrary->stopCall(); 
   }}