So I'm trying to create some custom fields for users. I need to give users access to a 30 day trial of some software and I want to keep track of that in the users page of administration panel. If the user is in the trail I want to add "Trial" at the top and "Yes" or "No" next to the username on the All Users page. I'm assuming this would be a core file somewhere, but I'm not sure which one.
You can hook
manage_users_columns to add (and I suppose remove) columns from the All users display. This tutorial details that.
You might be able to hook
user_edit_form_tag to do the trial vs not trial at the top...but I'm not sure, you'd have to tinker with it. I think you'll probably end up having to use something else (
WP_Error might be a good way to go), but that would be where I started.