How to compare values from two views I have two views, "viewA" and "viewB;" "viewA" contains all the users that post within the day, and "viewB" contains all the users. I need to get the difference between the two so I can get the users that don't have any post. I could use views_get_view_result() and views_get_current_view(), but I don't know how to implement the code.
Instead of trying to compare the result of two views and find the difference, which is highly inefficient and difficult, it will be a lot easier to create a new view that filters out the users that that has posted within a day.

You should be able to duplicate ViewA and reverse it's filter(s). It should at least provide a good starting point.