controller.html

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            我們開始分析core/Controller.php。<br/>
              在開發application時，在model、controller等地方會寫到的$this就是繼承這個本體物件。<br/>
              甚至在撰寫library時，常常為了使用ci本身的helper、model等功能，寫出 $this->ci =& get_instance() 這樣的程式碼。<br/>
            
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        <pre class="brush: php">
<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

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

/**
 * CodeIgniter 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		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/general/controllers.html
 */
class CI_Controller {

	private static $instance;

	/**
	 * Constructor
	 */
	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.
		foreach (is_loaded() as $var => $class)
		{
			$this->$var =& load_class($class);
		}
    </pre>
        <div class='alert alert-success'>
            將之前載入的類別全部與這個物件接在一起。<br/>
            開發者因而可以使用$this->router、$this->uri、$this->config等成員變數。<br/>
            不過，開發者想要繼續用$RTR =& load_class('Router', 'core')以及$URI =& load_class('URI', 'core')這種寫法，也是可以啦。
        </div>

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        <pre class="brush: php">
    
    
		$this->load =& load_class('Loader', 'core');

		$this->load->initialize();
		
		log_message('debug', "Controller Class Initialized");
	}
    </pre>
        <div class='alert alert-success'>
            最後載入Loader類別，開發者讀取model、library、helper等類別都靠它。<br/>
            參見：<a href='loader.html'>統一的載入介面：core/Loader.php</a>
        </div>
        <div class='alert alert-danger'>
            那一行$this->load->initialize()很莫名其妙。前面用load_class載入類別，並不會在之後呼叫任何初始化函數，而是直接寫在建構式內。<br/>
            這邊卻是在Loader類別的建構式執行一些動作，之後呼叫initialize再執行一些動作。<br/>
            也就是說「load_class」到底是純粹載入類別？還是載入的同時順便執行初始工作？<br/>
            可說是多此一舉，並且意義不一致。<br/>
        </div>

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        <pre class="brush: php">


	public static function &get_instance()
	{
		return self::$instance;
	}
}
// END Controller class

/* End of file Controller.php */
/* Location: ./system/core/Controller.php */

          
          </pre>

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