从页面层次结构中获取自定义字段数据

想象一下，我有一个用这种层次结构中的页面设置的站点。。

-Home
-Cars 
 -Volvo 850 
  -Volvo 850 tech spec 
  -Volvo 850 pictures
 -Porsche 911 
  -Porsche 911 tech spec
  -Porsche 911 pictures
 -other cars etc

现在你可以看到我有很多车。在每个汽车页面（沃尔沃850、保时捷911）上，我都有一些自定义字段，在这些字段中输入了有关汽车的各种数据（顺便说一下，我使用Custom Field Template plugin 以便在wp admin中轻松输入此数据）。这些字段显示在页面上。（技术规格和图片页面上未输入字段）

我想做的是在主页（下面）上显示一个汽车列表，从自定义字段中获取数据。（a）访问此自定义字段数据（添加或编辑新车时可能会更改）和（b）按特定顺序显示数据（例如按最高速度）的最佳方式是什么。。？

---------------------------------------
|   Car              |   Top Speed    |
---------------------------------------
| Porsche 911        |   200          |
| Audi 444           |   180          |
| Volvo 840          |   160          |
---------------------------------------

我猜伪代码是

* find all pages which are an immediate descendant of the Cars page (not the tech spec and pictures)
* get the custom data from these pages
* display data in Top Speed order

global $edl_global_join; global $edl_global_orderby; global $wp_query; function edl_posts_join ($join) { global $edl_global_join; if ($edl_global_join) $join .= " $edl_global_join"; return $join; } function edl_posts_orderby ($orderby) { global $edl_global_orderby; if ($edl_global_orderby) $orderby = $edl_global_orderby; return $orderby; } add_filter(\'posts_join\',\'edl_posts_join\'); add_filter(\'posts_orderby\',\'edl_posts_orderby\'); $edl_global_join = "JOIN $wpdb->postmeta meta1 ON (meta1.post_id = $wpdb->posts.ID AND meta1.meta_key = \'TOPSPEED\')" . "JOIN $wpdb->postmeta meta2 ON (meta2.post_id = $wpdb->posts.ID AND meta2.meta_key = \'ANOTHER_THING\')"; $edl_global_orderby = " meta1.meta_value * meta2.meta_value DESC"; $wp_query = new WP_Query($args);

// // specific display for size overviews // function display_meta_size() { $this->mMetaData->GetValuesFromWP(); ?> <table width="100%"> <?php $this->mMetaData->ShowIcon(); $this->mMetaData->ShowSize(); ?> </table> <?php }

// get the values stored in WordPress function GetValuesFromWP() { global $post; $custom = get_post_custom($post->ID); foreach ($this->mArrMetaDataFields as $str_meta_data_field) { $this->MetaDataWpValues[$str_meta_data_field] = $custom[$str_meta_data_field][0]; } $this->MetaDataWpValues[\'SPECIAL\'] = $custom[\'SPECIAL\'][0]; }

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