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+<title>Upgrading from 1.7.2 to 2.0.0 : CodeIgniter User Guide</title>
+
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+<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
+<tr>
+<td><h1>CodeIgniter User Guide Version 2.0.2</h1></td>
+<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
+</tr>
+</table>
+</div>
+<!-- END NAVIGATION -->
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+<tr>
+<td id="breadcrumb">
+<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
+<a href="../index.html">User Guide Home</a> ›
+Upgrading from 1.7.2 to 2.0.0
+</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>
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+
+<!-- START CONTENT -->
+<div id="content">
+
+<h1>Upgrading from 1.7.2 to 2.0.0</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 all files and directories in your "system" folder <strong>except</strong> your <kbd>application</kbd> folder.</p>
+
+<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: Adjust get_dir_file_info() where necessary</h2>
+
+<p>Version 2.0.0 brings a non-backwards compatible change to <kbd>get_dir_file_info()</kbd> in the <a href="../helpers/file_helper.html">File Helper</a>. Non-backwards compatible changes are extremely rare
+ in CodeIgniter, but this one we feel was warranted due to how easy it was to create serious server performance issues. If you <em>need</em>
+ recursiveness where you are using this helper function, change such instances, setting the second parameter, <kbd>$top_level_only</kbd> to FALSE:</p>
+
+<code>get_dir_file_info('/path/to/directory', <kbd>FALSE</kbd>);</code>
+
+</p>
+
+<h2>Step 3: Convert your Plugins to Helpers</h2>
+
+<p>2.0.0 gets rid of the "Plugin" system as their functionality was identical to Helpers, but non-extensible. You will need to rename your plugin files from <var>filename_pi.php</var> to <var>filename_helper.php</var>, move them to your <kbd>helpers</kbd> folder, and change all instances of:
+
+ <code>$this->load->plugin('foo');</code>
+
+to
+
+ <code>$this->load->helper('foo');</code>
+
+</p>
+
+<h2>Step 4: Update stored encrypted data</h2>
+
+<p class="important"><strong>Note:</strong> If your application does not use the Encryption library, does not store Encrypted data permanently, or is on an environment that does not support Mcrypt, you may skip this step.</p>
+
+<p>The Encryption library has had a number of improvements, some for encryption strength and some for performance, that has an unavoidable consequence of
+ making it no longer possible to decode encrypted data produced by the original version of this library. To help with the transition, a new method has
+ been added, <kbd>encode_from_legacy()</kbd> that will decode the data with the original algorithm and return a re-encoded string using the improved methods.
+ This will enable you to easily replace stale encrypted data with fresh in your applications, either on the fly or en masse.</p>
+
+<p>Please read <a href="../libraries/encryption.html#legacy">how to use this method</a> in the Encryption library documentation.</p>
+
+<h2>Step 5: Remove loading calls for the compatibility helper.</h2>
+<p>The compatibility helper has been removed from the CodeIgniter core. All methods in it should be natively available in supported PHP versions.</p>
+
+<h2>Step 6: Update Class extension</h2>
+<p>All core classes are now prefixed with <kbd>CI_</kbd>. Update Models and Controllers to extend CI_Model and CI_Controller, respectively.</p>
+
+<h2>Step 7: Update Parent Constructor calls</h2>
+<p>All native CodeIgniter classes now use the PHP 5 <kbd>__construct()</kbd> convention. Please update extended libraries to call <kbd>parent::__construct()</kbd>.</p>
+
+<h2>Step 8: Update your user guide</h2>
+<p>Please replace your local copy of the user guide with the new version, including the image files.</p>
+
+</div>
+<!-- END CONTENT -->
+
+
+<div id="footer">
+<p>
+Previous Topic: <a href="index.html">Installation Instructions</a>
+ ·
+<a href="#top">Top of Page</a> ·
+<a href="../index.html">User Guide Home</a> ·
+Next Topic: <a href="troubleshooting.html">Troubleshooting</a>
+</p>
+<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
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+
+</body>
+</html>
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