/system/core/Controlller.php CI应用控制器类

<?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
 * CI 应用控制器类
 * 
 * This class object is the super class that every library in
 * CodeIgniter will be assigned to.
 *
 * 这个类的对象是超一流的，每个图书馆在笨将被分配到。

 * @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; //私有的静态的变量，instance

	/**
	 * Constructor
	 */
	public function __construct()
	{
		self::$instance =& $this; //将类自己的引用效给自己的静态成员变量
		
		// 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.
		// 将所有的类实例化的对象
		// 自举文件（CodeIgniter.php）局部类变量
		// 所以，CI可以运行一个超级大对象。
		
		//is_loaded需要加载的一些类文件
		foreach (is_loaded() as $var => $class)
		{
			//然后对每个类进行加载，放入到自己的一个成员中，
			//$this->className能运行起来的原因
			$this->$var =& load_class($class);
		}

		//加载Loader类 /core/Loader
		$this->load =& load_class('Loader', 'core');
		

		//初始化装载机 initialize() load还没有看源码
		$this->load->initialize();
		
		log_message('debug', "Controller Class Initialized 控制器类初始化");
	}

	//这里有点像那个单线模式，也就是一个类的对象在整个运行过程中只有一个实例
	public static function &get_instance()
	{
		return self::$instance;
		/*if(empty(self::$instance))
		{
			self::$instance = new CI_Controller();
		}*/
		
	}
}
// END Controller class

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