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+<td><h1>Code Igniter User Guide Version 1.4.0</h1></td>
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+<a href="http://www.codeigniter.com/">Code Igniter Home</a> ›
+<a href="../index.html">User Guide Home</a> ›
+Replacing System Classes
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+
+<h1>Replacing System Classes</h1>
+
+<p>Every time Code Igniter 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 files with your own versions. Most users will never have any need to do this,
+but the option to replace them does exist for those that would like to significantly alter the Code Igniter core.
+</p>
+
+<p class="important"><strong>Note:</strong> Replacing a core system class with your own version 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 Code Igniter runs:</p>
+
+<ul>
+<li>Benchmark</li>
+<li>Input</li>
+<li>Config</li>
+<li>Hooks</li>
+<li>Router</li>
+<li>URI</li>
+<li>Language</li>
+<li>Loader</li>
+<li>Controller</li>
+<li>Output</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>libraries</dfn> directory:</p>
+
+<code>application/libraries/<dfn>some-class.php</dfn></code>
+
+<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>
+
+
+
+
+
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