我试图通过meta\\u键查询自定义帖子排序。但是在运行WP\\u查询之后，order子句中的sql查询没有任何更改。

$args = array(
\'post_type\'   => \'event\',
\'post_status\' => \'publish\',

\'meta_key\' => \'_start_eventtimestamp\',
\'orderby\' => \'meta_value_datetime\',
\'order\' => \'ASC\',

\'meta_query\' => array(
    array(
        \'key\' => \'_start_eventtimestamp\',
        \'value\' => date(\'Ymd\'),
        \'compare\' => \'>=\'
    )
),

\'posts_per_page\' => \'7\',
);

$event_query = new WP_Query( $args );

当我得到生成的查询时，我得到了：

SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts
 INNER JOIN wp_postmeta ON ( wp_posts.ID = wp_postmeta.post_id )
 INNER JOIN wp_postmeta AS mt1 ON ( wp_posts.ID = mt1.post_id )
 WHERE 1=1 AND ( wp_postmeta.meta_key = \'_start_eventtimestamp\'
 AND ( ( mt1.meta_key = \'_start_eventtimestamp\' AND mt1.meta_value >= \'20160930\' ) ) )
 AND wp_posts.post_type = \'event\' AND ((wp_posts.post_status = \'publish\'))
 GROUP BY wp_posts.ID ORDER BY wp_posts.menu_order ASC LIMIT 0, 7

订单条款没有变化
我的按meta\\u键排序的脚本中是否有错误？

$args = array( 
         \'post_type\'   => \'event\',
         \'post_status\' => \'publish\',
         \'orderby\' => array(
           \'meta_key\' => \'ASC\'
          ), 
         \'meta_query\' => array(
           array(
             \'key\' => \'_start_eventtimestamp\',
             \'value\' => date(\'Ymd\'),
             \'compare\' => \'>=\'
          ),
       ),
    );