function is_not_joined_in_group($group_id)
{
require_once WP_PLUGIN_DIR . '/pr-membership/models/group-model.php';
$model = new Group_Model();
$user_id = get_current_user_id();
$result = $model->check_group_joins($group_id, $user_id);
if ($result) {
return true;
} else {
return false;
}
}