CodeIgniter庫：訪問CodeIgniter Superobject導致PHP錯誤的嚴重性：通知

Question

我有一個CodeIgniter庫。當我從我的控制器訪問它時，會生成嚴重性：Notice的PHP錯誤。但是，調試器顯示超級對象存在於庫中，並且是超級對象。

這裏是圖書館類：

class Auth_lib { 

    protected $CI; 

    public function __construct() 
    { 
     $this->$CI =& get_instance(); 
     $this->$CI->load->model('auth_model'); 
     $this->$CI->load->library('session'); 
    } 

    /** 
    * checks if the current user is logged into a session 
    * @param 
    * @return boolean 
    */ 
    public function is_logged_in(){ 
     $result = $this->$CI->session->userdata('is_logged_in'); 
     return $result; 
    } 
} 

這是怎樣的庫是從我的控制器稱爲：

 public function __construct() 
     { 
      parent::__construct(); 
      $this->load->helper('url_helper'); 
      $this->load->library('auth_lib'); 

      // test if user is logged in and authorised, if not redirect to login controller 

      if($this->auth_lib->is_logged_in() != null){ 
       // check if is admin 
       } 
      } else { 
       // not logged in, redirect to login controller 
      } 

     } 

那麼，爲什麼我收到此錯誤：

A PHP Error was encountered Severity: Notice Message: Undefined variable: CI Filename: libraries/Auth_lib.php Line Number: 20

Answer 1

1. 使用$this->CI而不是$this->$CI。

2. return isset($result)?TRUE:FALSE;來自庫的is_logged_in()函數。

   庫/ Auth_lib.php

   class Auth_lib { 
   
       protected $CI; 
   
       public function __construct() 
       { 
       $this->CI =& get_instance(); 
       $this->CI->load->model('auth_model'); 
       $this->CI->load->library('session'); 
       } 
   
   /** 
   * checks if the current user is logged into a session 
   * @param 
   * @return boolean 
   */ 
       public function is_logged_in(){ 
       $result = $this->CI->session->userdata('is_logged_in'); 
       return isset($result)?TRUE:FALSE;//make sure that you have set session or not 
       } 
   } 
   

   控制器

   public function __construct() 
       { 
        parent::__construct(); 
        $this->load->helper('url_helper'); 
        $this->load->library('auth_lib'); 
   
        // test if user is logged in and authorised, if not redirect to login controller 
   
        if($this->auth_lib->is_logged_in()){ 
         // check if is admin 
         } 
        else { 
         // not logged in, redirect to login controller 
        } 
   
       }