user_guide_src/source/installation/upgrade_306.rst
############################# Upgrading from 3.0.5 to 3.0.6 #############################
Before performing an update you should take your site offline by replacing the index.php file with a static one.
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.
We've made some tweaks to the index.php file, mostly related to proper
usage of directory separators (i.e. use the DIRECTORY_SEPARATOR
constant instead of a hard coded forward slash "/").
Nothing will break if you skip this step, but if you're running Windows or just want to be up to date with every change - we do recommend that you update your index.php file.
Tip: Just copy the ENVIRONMENT, $system_path, $application_folder
and $view_folder declarations from the old file and put them into the
new one, replacing the defaults.
The :doc:Form Validation Library <../libraries/form_validation> has a
prep_for_form() method, which is/can also be used as a rule in
set_rules() to automatically perform HTML encoding on input data.
Automatically encoding input (instead of output) data is a bad practice in
the first place, and CodeIgniter and PHP itself offer other alternatives
to this method anyway.
For example, :doc:Form Helper <../helpers/form_helper> functions will
automatically perform HTML escaping when necessary.
Therefore, the prep_for_form method/rule is pretty much useless and is now deprecated and scheduled for removal in 3.1+.
.. note:: The method is still available, but you're strongly encouraged to remove its usage sooner rather than later.