我的设置

我有一个关于管理面板中用户过滤器过滤的问题。我添加了显示“registration\\u date”过滤器的代码，该过滤器工作正常。I found this website to describe the process. This part works fine.

现在，我正在尝试按最近注册的用户实现默认排序。在我的功能中。php，我尝试过这种方法which I\'ve found here. This part works partially only. 这是我的代码：

add_action(\'pre_get_users\', \'change_user_order\');

function change_user_order($query) {
    $screen = get_current_screen();
    if( is_admin() && \'users\' == $screen->base) {
        if( !isset($query->query[\'orderby\']) ) {
            $query->set(\'orderby\', \'registered\');
            $query->set(\'order\', \'DESC\');
        }
    }

   // We need to remember to return the altered query.
   return $query;
}

默认情况下，此部分工作正常，因为过滤是由最新版本完成的。现在，它似乎还取消了对其他可排序列进行排序的所有其他可能性（例如asc登录）。例如，此urlwp-admin/users.php?orderby=login&order=asc 不会显示按登录名排序的用户字段。What did I do wrong?

Update - Accepted solution & final code

为完整起见，用户面板中此默认选择的可排序列和订单列的最终代码附在此处：

add_action(\'pre_get_users\', \'change_user_order\');

function change_user_order($query) {
    $screen = get_current_screen();
    if( is_admin() && \'users\' == $screen->base) {
        // Set default `orderby` to \'registered\'.
        if( empty( $_REQUEST[\'orderby\'] ) || !isset($query->query_vars[\'orderby\']) ) {
            $query->set(\'orderby\', \'registered\');
        }
        // Set default `order` to \'DESC\'.
        if( empty( $_REQUEST[\'order\'] ) || !isset($query->query_vars[\'order\']) ) {
            $query->set(\'order\', \'DESC\');
        }       
    }

   // We need to remember to return the altered query.
   return $query;
}

empty( $_REQUEST[\'{VAR}\'] ) || !isset($query->query_vars[\'{VAR}\'])

// Set default `orderby` to \'registered\'.
if( empty( $_REQUEST[\'orderby\'] ) || !isset($query->query_vars[\'orderby\']) ) {
    $query->set(\'orderby\', \'registered\');
}

// Set default `order` to \'DESC\'.
if( empty( $_REQUEST[\'order\'] ) || !isset($query->query_vars[\'order\']) ) {
    $query->set(\'order\', \'DESC\');
}

if( !isset($query->query[\'orderby\']) ) {
    $query->set(\'orderby\', \'registered\');
    $query->set(\'order\', \'DESC\');
}