Function: Recalcuates the length of string vars within serialized data.
Function: Adds custom classes to the body.
Filter Hook: Remove the hook into the WP ‘the_content’ filter once we are in our handler. This will allow other templates to call the ‘the_content’ filter without causing recusion.
Function: Updates the essays post meta with a reference to the quiz attempt user meta.
Filter Hook: Filters the quiz attempts left for a user.