Removes capability from user.

Removes role from user.

Sets the role of the user.

Converts numeric level to level capability name.

Updates the maximum user level for the user.

Add a link to using values provided in $_POST.

Adds a role, if it does not exist.

Adds a submenu page to the Appearance main menu.

Creates a new user from the “Users” form using $_POST information.

Check whether a category exists.