Analyze-Codeigniter/controller.html at master · howtomakeaturn/Analyze-Codeigniter · GitHub

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<!DOCTYPE html>
<!--[if lt IE 7]>      <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
<!--[if IE 7]>         <html class="no-js lt-ie9 lt-ie8"> <![endif]-->
<!--[if IE 8]>         <html class="no-js lt-ie9"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js"> <!--<![endif]-->
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title></title>
        <meta name="description" content="">
        <meta name="viewport" content="width=device-width, initial-scale=1">

        <!-- Place favicon.ico and apple-touch-icon.png in the root directory -->

        <link rel="stylesheet" href="css/normalize.css">
        <link rel="stylesheet" href="css/main.css">
        <script src="js/vendor/modernizr-2.6.2.min.js"></script>

        <link rel="stylesheet" href="css/bootstrap.css">
        <link rel="stylesheet" href="css/shCore.css">
        <link rel="stylesheet" href="css/shThemeDefault.css">
        <script src="js/shCore.js"></script>
        <script src="js/shBrushPhp.js"></script>

    </head>
    <body>
        <!--[if lt IE 7]>
            <p class="browsehappy">You are using an <strong>outdated</strong> browser. Please <a href="http://browsehappy.com/">upgrade your browser</a> to improve your experience.</p>
        <![endif]-->

        <!-- Add your site or application content here -->
        <div class='alert alert-success'>
            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/>

        </div>

        <!-- You also need to add some content to highlight, but that is covered elsewhere. -->
        <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>

        <!-- You also need to add some content to highlight, but that is covered elsewhere. -->
        <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>

        <!-- You also need to add some content to highlight, but that is covered elsewhere. -->
        <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>

        <div class='alert alert-danger'>

        </div>


        <!-- Finally, to actually run the highlighter, you need to include this JS on your page -->
        <script type="text/javascript">
             SyntaxHighlighter.all()
        </script>

    </body>
    <style>
        body{
            width: 960px;
            margin: 0 auto;
            background-color: #444;
        }
        .alert{
            line-height: 2;
        }

    </style>
</html>