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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>Upgrading from 1.7.1 to 1.7.2 : CodeIgniter User Guide</title>
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<td><h1>CodeIgniter User Guide Version 2.1.4</h1></td>
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Upgrading from 1.7.1 to 1.7.2
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<h1>Upgrading from 1.7.1 to 1.7.2</h1>
<p>Before performing an update you should take your site offline by replacing the index.php file with a static one.</p>
<h2>Step 1: Update your CodeIgniter files</h2>
<p>Replace these files and directories in your "system" folder with the new versions:</p>
<ul>
<li><dfn>system/codeigniter</dfn></li>
<li><dfn>system/database</dfn></li>
<li><dfn>system/helpers</dfn></li>
<li><dfn>system/language</dfn></li>
<li><dfn>system/libraries</dfn></li>
<li><dfn>index.php</dfn></li>
</ul>
<p class="important"><strong>Note:</strong> If you have any custom developed files in these folders please make copies of them first.</p>
<h2>Step 2: Remove header() from 404 error template</h2>
<p>If you are using header() in your 404 error template, such as the case with the default <samp>error_404.php</samp> template shown below, remove that line of code.</p>
<code><?php header("HTTP/1.1 404 Not Found"); ?></code>
<p>404 status headers are now properly handled in the show_404() method itself.</p>
<h2>Step 3: Confirm your system_path</h2>
<p>In your updated index.php file, confirm that the <dfn>$system_path</dfn> variable is set to your application's system folder.</p>
<h2>Step 4: Update your user guide</h2>
<p>Please replace your local copy of the user guide with the new version, including the image files.</p>
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