[ci skip] Close #5482

2 files changed, 16 insertions, 2 deletions

diff --git a/user_guide_src/source/helpers/inflector_helper.rst b/user_guide_src/source/helpers/inflector_helper.rst
index df0c568c0..e3c014939 100644
--- a/user_guide_src/source/helpers/inflector_helper.rst
+++ b/user_guide_src/source/helpers/inflector_helper.rst
@@ -85,7 +85,7 @@ The following functions are available:
 
 		echo humanize('my-dog-spot', '-'); // Prints 'My Dog Spot'
 
-.. php:function:: is_countable($word)
+.. php:function:: word_is_countable($word)
 
 	:param	string	$word: Input string
 	:returns:	TRUE if the word is countable or FALSE if not
@@ -93,4 +93,7 @@ The following functions are available:
 
 	Checks if the given word has a plural version. Example::
 
-		is_countable('equipment'); // Returns FALSE
\ No newline at end of file
+		word_is_countable('equipment'); // Returns FALSE
+
+	.. note:: This function used to be called ``is_countable()`` in
+		in previous CodeIgniter versions.
diff --git a/user_guide_src/source/installation/upgrade_3110.rst b/user_guide_src/source/installation/upgrade_3110.rst
index a19f1e68e..0e3b7c676 100644
--- a/user_guide_src/source/installation/upgrade_3110.rst
+++ b/user_guide_src/source/installation/upgrade_3110.rst
@@ -12,3 +12,14 @@ 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()`.