WordPress获取某个分类所有的标签

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所属分类:建站日志

获取指定分类的标签。

1.在functions.php中添加以下函数:

//标签云自定义函数
function ludou_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;
}
 

2.在边栏sidebar中添加如下代码

// 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
$tags = ludou_get_category_tags($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;

来自:http://www.ludou.org/wordpress-get-tags-specific-to-category.html

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