bcit-ci/CodeIgniter

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Upgrading from 2.1.4 to 2.2.x
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.. note:: The **Encrypt Class** now requires the Mcrypt extension. If you
    were previously using the Encrypt Class without Mcrypt, then this
    is a breaking change.  You must install the Mcrypt extension in
    order to upgrade. For information on installing Mcrypt please see
    the PHP `documentation <https://secure.php.net/manual/en/mcrypt.setup.php>`.

Before performing an update you should take your site offline by
replacing the index.php file with a static one.

Step 1: Update your CodeIgniter files
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Replace all files and directories in your "system" folder.

.. note:: If you have any custom developed files in these folders please
    make copies of them first.