Checks if a user is activated when moderated registration is used.
(int) (optional) The user ID. If not ID is passed, the current user ID will be used.
(boolean) Returns true if user is activated, otherwise false.
Introduced in version 3.1.7
Added as an alias of WP_Members_Users::is_user_activated() in 3.2.3
wpmem_is_user_activated() is located in /includes/api-users.php.