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<td><h1>CodeIgniter User Guide Version 1.6.3</h1></td>
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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;
Upgrading from 1.3.3 to 1.4.0
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<h1>Upgrading from 1.3.3 to 1.4.0</h1>

<p class="important"><strong>Note:</strong> The instructions on this page assume you are running version 1.3.3.  If you
have not upgraded to that version please do so first.</p>

<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 the following directories in your "system" folder with the new versions:</p>

<p class="important"><strong>Note:</strong> If you have any custom developed files in these folders please make copies of them first.</p>

<ul>
<li>application/config/<strong>hooks.php</strong></li>
<li>application/config/<strong>mimes.php</strong></li>
<li>codeigniter</li>
<li>drivers</li>
<li>helpers</li>
<li>init</li>
<li>language</li>
<li>libraries</li>
<li>scaffolding</li>
</ul>


<h2>Step 2: Update your config.php file</h2>

<p>Open your <dfn>application/config/config.php</dfn> file and add these new items:</p>

<pre>

/*
|--------------------------------------------------------------------------
| Enable/Disable System Hooks
|--------------------------------------------------------------------------
|
| If you would like to use the "hooks" feature you must enable it by
| setting this variable to TRUE (boolean).  See the user guide for details.
|
*/
$config['enable_hooks'] = FALSE;


/*
|--------------------------------------------------------------------------
| Allowed URL Characters
|--------------------------------------------------------------------------
|
| This lets you specify which characters are permitted within your URLs.
| When someone tries to submit a URL with disallowed characters they will
| get a warning message.
|
| As a security measure you are STRONGLY encouraged to restrict URLs to
| as few characters as possible.  By default only these are allowed: a-z 0-9~%.:_-
|
| Leave blank to allow all characters -- but only if you are insane.
|
| DO NOT CHANGE THIS UNLESS YOU FULLY UNDERSTAND THE REPERCUSSIONS!!
|
*/
$config['permitted_uri_chars'] = 'a-z 0-9~%.:_-';
</pre>


<h2>Step 3: Update your user guide</h2>

<p>Please also replace your local copy of the user guide with the new version.</p>

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