diff options
| author | Derek Jones <derek.jones@ellislab.com> | 2011-10-05 20:34:52 +0200 |
|---|---|---|
| committer | Derek Jones <derek.jones@ellislab.com> | 2011-10-05 20:34:52 +0200 |
| commit | 8ede1a2ecbb62577afd32996956c5feaf7ddf9b6 (patch) | |
| tree | 2e960ec3b416b477f40bb546371f2d486f4a22f0 /user_guide/general/core_classes.html | |
| parent | d1ecd5cd4ae6ab5d37df9fbda14b93977b9e743c (diff) | |
replacing the old HTML user guide with a Sphinx-managed user guide
Diffstat (limited to 'user_guide/general/core_classes.html')
| -rw-r--r-- | user_guide/general/core_classes.html | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/user_guide/general/core_classes.html b/user_guide/general/core_classes.html deleted file mode 100644 index b8917864f..000000000 --- a/user_guide/general/core_classes.html +++ /dev/null @@ -1,186 +0,0 @@ -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> -<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> -<head> - -<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> -<title>Creating Core System Classes : CodeIgniter User Guide</title> - -<style type='text/css' media='all'>@import url('../userguide.css');</style> -<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' /> - -<script type="text/javascript" src="../nav/nav.js"></script> -<script type="text/javascript" src="../nav/prototype.lite.js"></script> -<script type="text/javascript" src="../nav/moo.fx.js"></script> -<script type="text/javascript" src="../nav/user_guide_menu.js"></script> - -<meta http-equiv='expires' content='-1' /> -<meta http-equiv= 'pragma' content='no-cache' /> -<meta name='robots' content='all' /> -<meta name='author' content='ExpressionEngine Dev Team' /> -<meta name='description' content='CodeIgniter User Guide' /> - -</head> -<body> - -<!-- START NAVIGATION --> -<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div> -<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div> -<div id="masthead"> -<table cellpadding="0" cellspacing="0" border="0" style="width:100%"> -<tr> -<td><h1>CodeIgniter User Guide Version 2.0.3</h1></td> -<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td> -</tr> -</table> -</div> -<!-- END NAVIGATION --> - - -<!-- START BREADCRUMB --> -<table cellpadding="0" cellspacing="0" border="0" style="width:100%"> -<tr> -<td id="breadcrumb"> -<a href="http://codeigniter.com/">CodeIgniter Home</a> › -<a href="../index.html">User Guide Home</a> › -Creating Core System Classes -</td> -<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td> -</tr> -</table> -<!-- END BREADCRUMB --> - -<br clear="all" /> - - -<!-- START CONTENT --> -<div id="content"> - -<h1>Creating Core System Classes</h1> - -<p>Every time CodeIgniter runs there are several base classes that are initialized automatically as part of the core framework. -It is possible, however, to swap any of the core system classes with your own versions or even extend the core versions.</p> - -<p><strong>Most users will never have any need to do this, -but the option to replace or extend them does exist for those who would like to significantly alter the CodeIgniter core.</strong> -</p> - -<p class="important"><strong>Note:</strong> Messing with a core system class has a lot of implications, so make sure you -know what you are doing before attempting it.</p> - - -<h2>System Class List</h2> - -<p>The following is a list of the core system files that are invoked every time CodeIgniter runs:</p> - -<ul> -<li>Benchmark</li> -<li>Config</li> -<li>Controller</li> -<li>Exceptions</li> -<li>Hooks</li> -<li>Input</li> -<li>Language</li> -<li>Loader</li> -<li>Log</li> -<li>Output</li> -<li>Router</li> -<li>URI</li> -<li>Utf8</li> -</ul> - -<h2>Replacing Core Classes</h2> - -<p>To use one of your own system classes instead of a default one simply place your version inside your local <dfn>application/core</dfn> directory:</p> - -<code>application/core/<dfn>some-class.php</dfn></code> - -<p>If this directory does not exist you can create it.</p> - -<p>Any file named identically to one from the list above will be used instead of the one normally used.</p> - -<p>Please note that your class must use <kbd>CI</kbd> as a prefix. For example, if your file is named <kbd>Input.php</kbd> the class will be named:</p> - -<code> -class CI_Input {<br /><br /> - -} -</code> - - - -<h2>Extending Core Class</h2> - -<p>If all you need to do is add some functionality to an existing library - perhaps add a function or two - then -it's overkill to replace the entire library with your version. In this case it's better to simply extend the class. -Extending a class is nearly identical to replacing a class with a couple exceptions:</p> - -<ul> -<li>The class declaration must extend the parent class.</li> -<li>Your new class name and filename must be prefixed with <kbd>MY_</kbd> (this item is configurable. See below.).</li> -</ul> - -<p>For example, to extend the native <kbd>Input</kbd> class you'll create a file named <dfn>application/core/</dfn><kbd>MY_Input.php</kbd>, and declare your class with:</p> - -<code> -class MY_Input extends CI_Input {<br /><br /> - -}</code> - -<p>Note: If you need to use a constructor in your class make sure you extend the parent constructor:</p> - -<code> -class MY_Input extends CI_Input {<br /> -<br /> - function __construct()<br /> - {<br /> - parent::__construct();<br /> - }<br /> -}</code> - -<p class="important"><strong>Tip:</strong> Any functions in your class that are named identically to the functions in the parent class will be used instead of the native ones -(this is known as "method overriding"). -This allows you to substantially alter the CodeIgniter core.</p> - -<p>If you are extending the Controller core class, then be sure to extend your new class in your application controller's constructors.</p> - -<code>class Welcome extends MY_Controller {<br /> -<br /> - function __construct()<br /> - {<br /> - parent::__construct();<br /> - }<br /> -<br /> - function index()<br /> - {<br /> - $this->load->view('welcome_message');<br /> - }<br /> -}</code> - -<h3>Setting Your Own Prefix</h3> - -<p>To set your own sub-class prefix, open your <dfn>application/config/config.php</dfn> file and look for this item:</p> - -<code>$config['subclass_prefix'] = 'MY_';</code> - -<p>Please note that all native CodeIgniter libraries are prefixed with <kbd>CI_</kbd> so DO NOT use that as your prefix.</p> - - - - -</div> -<!-- END CONTENT --> - - -<div id="footer"> -<p> -Previous Topic: <a href="creating_libraries.html">Creating Your Own Libraries</a> - · -<a href="#top">Top of Page</a> · -<a href="../index.html">User Guide Home</a> · -Next Topic: <a href="hooks.html">Hooks - Extending the Core</a> -</p> -<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p> -</div> - -</body> -</html>
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