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#############################
Upgrading from 3.0.6 to 3.1.0
#############################
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
=====================================
Replace all files and directories in your *system/* directory.
.. note:: If you have any custom developed files in these directories,
please make copies of them first.
Step 2: Check your PHP version
==============================
We recommend always running versions that are `currently supported
<https://secure.php.net/supported-versions.php>`_, which right now is at least PHP 5.6.
PHP 5.2.x versions are now officially not supported by CodeIgniter, and while 5.3.7+
may be at least runnable, we strongly discourage you from using any PHP versions below
the ones listed on the `PHP.net Supported Versions <https://secure.php.net/supported-versions.php>`_
page.
Step 3: If you're using the 'odbc' database driver, check for usage of Query Builder
====================================================================================
:doc:`Query Builder <../database/query_builder>` functionality and ``escape()`` can
no longer be used with the 'odbc' database driver.
This is because, due to its nature, the `ODBC extension for PHP <https://secure.php.net/odbc>`_
does not provide a function that allows to safely escape user-supplied strings for usage
inside an SQL query (which our :doc:`Query Builder <../database/query_builder>` relies on).
Thus, user inputs MUST be bound, as shown in :doc:`Running Queries <../database/queries>`,
under the "Query Bindings" section.
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