############################## Upgrading from 3.1.9 to 3.1.10 ##############################

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 for calls to is_countable()

PHP 7.3 introduces a native is_countable() <https://secure.php.net/is_countable>_ function, which creates a name collision with the is_countable() function we've had in our :doc:Inflector Helpers <../helpers/inflector_helper>.

If you've been using the helper function in question, you should now rename the calls to it to :php:func:word_is_countable().