WordPress获取某个分类关联的标签

我在WordPress后台某篇文章的编辑页面，给这篇文章选择了分类：WordPress，接着同时选择了标签：php、主题制作，这时分类（WordPress）就与标签（php、主题制作）建立了关联，利用这种关联我们实现很多种需求，最典型的是细化WordPress文章分类功能，在子分类无法达到我们的需求时，可以使用标签来细化。我只需要提供WordPress分类的id，就可以得到它关联的标签：php、主题制作。

文章目录

0.1 调用函数
0.2 函数用法

1 获取某个标签关联的分类
- 1.1 调用范例

调用函数

我们可以先在主题目录的下的functions.php添加以下函数：

function mobantu_get_category_tags($args) {      global $wpdb;      $tags = $wpdb->get_results      ("          SELECT DISTINCT terms2.term_id as tag_id, terms2.name as tag_name          FROM              $wpdb->posts as p1              LEFT JOIN $wpdb->term_relationships as r1 ON p1.ID = r1.object_ID              LEFT JOIN $wpdb->term_taxonomy as t1 ON r1.term_taxonomy_id = t1.term_taxonomy_id              LEFT JOIN $wpdb->terms as terms1 ON t1.term_id = terms1.term_id,                $wpdb->posts as p2              LEFT JOIN $wpdb->term_relationships as r2 ON p2.ID = r2.object_ID              LEFT JOIN $wpdb->term_taxonomy as t2 ON r2.term_taxonomy_id = t2.term_taxonomy_id              LEFT JOIN $wpdb->terms as terms2 ON t2.term_id = terms2.term_id          WHERE              t1.taxonomy = 'category' AND p1.post_status = 'publish' AND terms1.term_id IN (".$args['categories'].") AND              t2.taxonomy = 'post_tag' AND p2.post_status = 'publish'              AND p1.ID = p2.ID          ORDER by tag_name      ");      $count = 0;            if($tags) {        foreach ($tags as $tag) {          $mytag[$count] = get_term_by('id', $tag->tag_id, 'post_tag');          $count++;        }      }      else {        $mytag = NULL;      }            return $mytag; }

函数用法

然后在其他主题文件中，我们可以调用某个分类或某几个分类关联的标签：

// 12,13是分类ID，多个用半角逗号隔开 $args = array( 'categories' => '12,13'); // 调用上面定义的函数，来获取ID为12，13的分类的关联标签 $tags = mobantu_get_category_tags($args); // 输出我们获取到的关联标签，以列表形式打印 $content .= "<ul>"; if(!empty($tags)) {    foreach ($tags as $tag) {      $content .= "<li><a href="".get_tag_link($tag->term_id)."">".$tag->name."</a></li>";    } } $content .= "</ul>"; echo $content;

好了，基本用法就这些，具体其他用法你可以自由地进行扩展。

获取某个标签关联的分类

反过来，我们可能会有这样的需求，既然可以获取某个分类的关联标签，那我能获取某个标签的关联分类吗？答案是可以的，将上面的代码稍微改一下就可以了：

function mobantu_get_tag_categories($args) {      global $wpdb;      $categories = $wpdb->get_results      ("          SELECT DISTINCT terms1.term_id as cat_id          FROM              $wpdb->posts as p1              LEFT JOIN $wpdb->term_relationships as r1 ON p1.ID = r1.object_ID              LEFT JOIN $wpdb->term_taxonomy as t1 ON r1.term_taxonomy_id = t1.term_taxonomy_id              LEFT JOIN $wpdb->terms as terms1 ON t1.term_id = terms1.term_id,              $wpdb->posts as p2              LEFT JOIN $wpdb->term_relationships as r2 ON p2.ID = r2.object_ID              LEFT JOIN $wpdb->term_taxonomy as t2 ON r2.term_taxonomy_id = t2.term_taxonomy_id              LEFT JOIN $wpdb->terms as terms2 ON t2.term_id = terms2.term_id          WHERE              t1.taxonomy = 'category' AND p1.post_status = 'publish' AND terms2.term_id IN (".$args['tags'].") AND              t2.taxonomy = 'post_tag' AND p2.post_status = 'publish'              AND p1.ID = p2.ID          ORDER by cat_id      ");      $count = 0;           if($categories) {        foreach ($categories as $category) {          $mycategory[$count] = get_term_by('id', $category->cat_id, 'category');          $count++;        }      }      else {        $mycategory = NULL;      }           return $mycategory; }

调用范例

// 12,13是标签ID，多个用半角逗号隔开 $args = array( 'tags' => '12,13'); // 调用上面定义的函数，来获取ID为12，13的标签的关联分类 $categories = mobantu_get_tag_categories($args); // 输出我们获取到的关联分类，以列表形式打印 $content .= "<ul>"; if(!empty($categories)) {    foreach ($categories as $category) {      $content .= "<li><a href="".get_category_link( $category->term_id )."">".$category->name."</a></li>";    } } $content .= "</ul>"; echo $content;