WordPress 中没有本地方法可以做到这一点。原因是标签不依赖于类别，它们是分开的。话虽这么说，要使某个特定类别的所有标签都在使用中，唯一的方法是循环浏览该类别的每个帖子并获取每个帖子的标签。
- 原文来源：详情
我已经编写了一个快速功能来做到这一点。
（包括子类别和帖子中的所有标签）
将此函数放入您的 functions.php 文件中。
function get_tags_in_use($category_ID, $type = 'name'){ // Set up the query for our posts $my_posts = new WP_Query(array( 'cat' => $category_ID, // Your category id 'posts_per_page' => -1 // All posts from that category ));
// Initialize our tag arrays $tags_by_id = array(); $tags_by_name = array(); $tags_by_slug = array();
// If there are posts in this category, loop through them if ($my_posts->have_posts()): while ($my_posts->have_posts()): $my_posts->the_post();
// Get all tags of current post $post_tags = wp_get_post_tags($my_posts->post->ID);
// Loop through each tag foreach ($post_tags as $tag):
// Set up our tags by id, name, and/or slug $tag_id = $tag->term_id; $tag_name = $tag->name; $tag_slug = $tag->slug;
// Push each tag into our main array if not already in it if (!in_array($tag_id, $tags_by_id)) array_push($tags_by_id, $tag_id);
if (!in_array($tag_name, $tags_by_name)) array_push($tags_by_name, $tag_name);
if (!in_array($tag_slug, $tags_by_slug)) array_push($tags_by_slug, $tag_slug);
endforeach; endwhile; endif;
// Return value specified if ($type == 'id') return $tags_by_id;
if ($type == 'name') return $tags_by_name;
if ($type == 'slug') return $tags_by_slug;}然后，当您要获取特定类别的标签时，请像下面这样调用此函数：
// First paramater is the category and the second paramater is how to return the tag (by name, by id, or by slug)// Leave second paramater blank to default to name
$tags = get_tags_in_use(59, 'name');希望这可以帮助。
编辑：
这是您需要与其他功能结合使用的功能：
function tag_cloud_by_category($category_ID){ // Get our tag array $tags = get_tags_in_use($category_ID, 'id');
// Start our output variable echo '<div class="tag-cloud">';
// Cycle through each tag and set it up foreach ($tags as $tag): // Get our count $term = get_term_by('id', $tag, 'post_tag'); $count = $term->count;
// Get tag name $tag_info = get_tag($tag); $tag_name = $tag_info->name;
// Get tag link $tag_link = get_tag_link($tag);
// Set up our font size based on count $size = 8 + $count;
echo '<span style="font-size:'.$size.'px;">'; echo '<a href="'.$tag_link.'">'.$tag_name.'</a>'; echo ' </span>';
endforeach;
echo '</div>';}因此，您可以像下面这样简单地使用此功能：
tag_cloud_by_category($cat_id);