Using WordPress ‘auth_redirect()’ PHP function
Checks if a user is logged in, if not it redirects them to the login page.
Users
Using WordPress ‘add_utility_page()’ PHP function
Add a top-level menu page in the ‘utility’ section.
Using WordPress ‘delete_user_option()’ PHP function
The `delete_user_option()` function in WordPress allows deleting user options with a global blog capability
Using WordPress ‘count_many_users_posts()’ PHP function
Gets the number of posts written by a list of users.