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 ludou_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 $categories = ludou_get_tag_categories($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;