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authorDerek Jones <derek.jones@ellislab.com>2011-10-05 20:34:52 +0200
committerDerek Jones <derek.jones@ellislab.com>2011-10-05 20:34:52 +0200
commit8ede1a2ecbb62577afd32996956c5feaf7ddf9b6 (patch)
tree2e960ec3b416b477f40bb546371f2d486f4a22f0 /user_guide/general/core_classes.html
parentd1ecd5cd4ae6ab5d37df9fbda14b93977b9e743c (diff)
replacing the old HTML user guide with a Sphinx-managed user guide
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-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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-<title>Creating Core System Classes : CodeIgniter User Guide</title>
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-<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
-<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
-Creating Core System Classes
-</td>
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-<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>&nbsp; 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 />
-&nbsp;&nbsp;&nbsp;&nbsp;function __construct()<br />
-&nbsp;&nbsp;&nbsp;&nbsp;{<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;parent::__construct();<br />
-&nbsp;&nbsp;&nbsp;&nbsp;}<br />
-}</code>
-
-<p class="important"><strong>Tip:</strong>&nbsp; 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 />
-&nbsp;&nbsp;&nbsp;&nbsp;function __construct()<br />
-&nbsp;&nbsp;&nbsp;&nbsp;{<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;parent::__construct();<br />
-&nbsp;&nbsp;&nbsp;&nbsp;}<br />
-<br />
-&nbsp;&nbsp;&nbsp;&nbsp;function index()<br />
-&nbsp;&nbsp;&nbsp;&nbsp;{<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$this->load->view('welcome_message');<br />
-&nbsp;&nbsp;&nbsp;&nbsp;}<br />
-}</code>
-
-<h3>Setting Your Own Prefix</h3>
-
-<p>To set your own sub-class prefix, open your <dfn>application/config/config.php</dfn> file and look for this item:</p>
-
-<code>$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 -->
-
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-<div id="footer">
-<p>
-Previous Topic:&nbsp;&nbsp;<a href="creating_libraries.html">Creating Your Own Libraries</a>
-&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
-<a href="#top">Top of Page</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
-<a href="../index.html">User Guide Home</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
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