Upgrading from 3.0.6 to 3.1.0
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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,
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 page.


Step 3: If you’re using the ‘odbc’ database driver, check for usage of Query Builder
====================================================================================

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 does
not provide a function that allows to safely escape user-supplied
strings for usage inside an SQL query (which our Query Builder relies
on).

Thus, user inputs MUST be bound, as shown in Running Queries, under
the “Query Bindings” section.
