我需要这样做：

        $postsOrder = get_sub_field(\'posts-ordering\');

        if ($postsOrder = \'post_views_count\') {
            $queryPopular = array (
                \'meta_key\' => \'post_views_count\',
                \'orderby\' => \'meta_value_num\',
            );
        }

        $query = new WP_Query(
            array(
            \'posts_per_page\' => $postsCount,
            \'post_type\' => $postsType->name,
            \'order\' => \'DESC\',
            \'orderby\' => $postsOrder,
            \'taxonomy\' => $postsTaxonomy,
            $queryPopular
            ),
        );

关键是，如果$postsOrder等于“post\\u views\\u count”，那么在$query中应该添加另外两个参数。如何正确操作？

  $args = array(
      \'posts_per_page\' => $postsCount,
      \'post_type\' => $postsType->name,
      \'order\' => \'DESC\',
      \'orderby\' => $postsOrder,
      \'taxonomy\' => $postsTaxonomy,
  );

  $postsOrder = get_sub_field(\'posts-ordering\');

  if ($postsOrder == \'post_views_count\') {
      $args[\'meta_key\'] = \'post_views_count\';
      $args[\'orderby\'] = \'meta_value_num\';
  }
  $query = new WP_Query($args);