【PHP】CI框架原始碼分析核心檔案之Controller.php

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 * @author    EllisLab Dev Team
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 * @copyright    Copyright (c) 2014 - 2016, British Columbia Institute of Technology ()
 * @license      MIT License
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defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Application Controller Class
 *
 * This class object is the super class that every library in
 * CodeIgniter will be assigned to.
 *
 * @package        CodeIgniter
 * @subpackage    Libraries
 * @category    Libraries
 * @author        EllisLab Dev Team
 * @link        /user_guide/general/controllers.html
 */
class CI_Controller {

    /**
     *引用CI單例項
     * Reference to the CI singleton
     *
     * @var    object
     */
    private static $instance;

    /**
     * Class constructor
     *
     * @return    void
     */
    public function __construct()
    {
        self::$instance =& $this;

        // Assign all the class objects that were instantiated by the
        // bootstrap file (CodeIgniter.php) to local class variables
        // so that CI can run as one big super object.
        //指派所有被引導檔案（CodeIgniter.php）例項化的類物件給本地類變數
        //這樣CI就能以超級物件執行
        foreach (is_loaded() as $var => $class)
        {
            //動態賦值屬性--即把is_load()中的例項化的物件賦值給控制器的本地屬性，達到CI超級類的目的
            $this->$var =& load_class($class);
        }
        //載入Loader類
        $this->load =& load_class('Loader', 'core');
        //初始化（autolaod陣列之指定的類，以及config設定）
        $this->load->initialize();
        log_message('info', 'Controller Class Initialized');
    }

    // --------------------------------------------------------------------

    /**
     *獲得CI的單例項
     * Get the CI singleton
     *
     * @static
     * @return    object
     */
    public static function &get_instance()
    {
        return self::$instance;
    }

}