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controller class and loader class
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‎codeigniter.html

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</pre>
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<div class='alert alert-success'>
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<div class='alert alert-danger'>
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讀取Input類別。在這邊執行建構式的同時，也對PHP的$_GET等變數進行了「消毒」。<br/>
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參見<a href='input.html'>資訊安全護城河：core/Input.php</a>
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<pre class="brush: php">
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<div class='alert alert-success'>
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載入controller類別，接著定義一個全域函數，可以接觸ci本體物件。<br/>
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在開發application時，在model、controller等地方會寫到的$this就是繼承這個本體物件。<br/>
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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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參見：<a href='controller.html'>組裝在一起：core/Controller.php</a>
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在core資料夾的類別，幾乎都是用load_class全域函數載入，這邊卻是用require與include。<br/>
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載入各個類別的機制顯得很混亂。
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<pre class="brush: php">

‎controller.html

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<!DOCTYPE html>
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<!--[if lt IE 7]> <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
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<!--[if IE 7]> <html class="no-js lt-ie9 lt-ie8"> <![endif]-->
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<!--[if IE 8]> <html class="no-js lt-ie9"> <![endif]-->
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<!--[if gt IE 8]><!--> <html class="no-js"> <!--<![endif]-->
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<title></title>
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<meta name="description" content="">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<!-- Place favicon.ico and apple-touch-icon.png in the root directory -->
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<link rel="stylesheet" href="css/normalize.css">
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<link rel="stylesheet" href="css/main.css">
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<script src="js/vendor/modernizr-2.6.2.min.js"></script>
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<link rel="stylesheet" href="css/bootstrap.css">
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<link rel="stylesheet" href="css/shCore.css">
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<link rel="stylesheet" href="css/shThemeDefault.css">
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<script src="js/shCore.js"></script>
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<script src="js/shBrushPhp.js"></script>
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</head>
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<body>
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<!--[if lt IE 7]>
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<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>
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<![endif]-->
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<!-- Add your site or application content here -->
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<div class='alert alert-success'>
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我們開始分析core/Controller.php。<br/>
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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/>
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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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</div>
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<!-- You also need to add some content to highlight, but that is covered elsewhere. -->
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<pre class="brush: php">
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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* CodeIgniter Application Controller Class
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*
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* This class object is the super class that every library in
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* CodeIgniter will be assigned to.
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*
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* @package CodeIgniter
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* @subpackage Libraries
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* @category Libraries
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/general/controllers.html
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*/
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class CI_Controller {
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private static $instance;
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/**
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* Constructor
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*/
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public function __construct()
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{
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self::$instance =& $this;
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// Assign all the class objects that were instantiated by the
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// bootstrap file (CodeIgniter.php) to local class variables
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// so that CI can run as one big super object.
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foreach (is_loaded() as $var => $class)
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{
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$this->$var =& load_class($class);
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}
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</pre>
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<div class='alert alert-success'>
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將之前載入的類別全部與這個物件接在一起。<br/>
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開發者因而可以使用$this->router、$this->uri、$this->config等成員變數。<br/>
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不過，開發者想要繼續用$RTR =& load_class('Router', 'core')以及$URI =& load_class('URI', 'core')這種寫法，也是可以啦。
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</div>
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<!-- You also need to add some content to highlight, but that is covered elsewhere. -->
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<pre class="brush: php">
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$this->load =& load_class('Loader', 'core');
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$this->load->initialize();
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log_message('debug', "Controller Class Initialized");
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}
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</pre>
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<div class='alert alert-success'>
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最後載入Loader類別，開發者讀取model、library、helper等類別都靠它。<br/>
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參見：<a href='loader.html'>統一的載入介面：core/Loader.php</a>
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</div>
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<div class='alert alert-danger'>
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那一行$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/>
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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/>
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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/>
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可說是多此一舉，並且意義不一致。<br/>
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</div>
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<!-- You also need to add some content to highlight, but that is covered elsewhere. -->
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<pre class="brush: php">
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public static function &get_instance()
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{
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return self::$instance;
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}
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}
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// END Controller class
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/* End of file Controller.php */
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/* Location: ./system/core/Controller.php */
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</pre>
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<div class='alert alert-danger'>
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</div>
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<!-- Finally, to actually run the highlighter, you need to include this JS on your page -->
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<script type="text/javascript">
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SyntaxHighlighter.all()
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</script>
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</body>
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<style>
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body{
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width: 960px;
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margin: 0 auto;
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background-color: #444;
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}
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.alert{
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line-height: 2;
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}
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</style>
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</html>

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