WP_User::remove_all_caps()
Method: Removes all of the capabilities of the user.
Source: wp-includes/class-wp-user.php:738
WP_User::has_prop()
Method: Determines whether a property or meta key is set.
Source: wp-includes/class-wp-user.php:428
WP_User::has_cap()
Method: Returns whether the user has the specified capability.
Source: wp-includes/class-wp-user.php:773