user_guide_src/source/installation/upgrade_3110.rst
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Upgrading from 3.1.9 to 3.1.10
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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
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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()
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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()`.