如果需要在分类列表页面，显示当前分类文章中添加的所有标签，方便读者阅读自己喜欢的内容，下面的代码可以帮你实现这个功能。首先，在主题 unctions.php 模板文件中添加以下函数：
- function 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;
- }
其次，将下面调用输出代码，添加到主题 archive.php 模板适当位置：
- <?php
- $cat= single_cat_title('', false);
- $args = array( 'categories' => get_cat_ID($cat));
- $tags = get_category_tags($args);
- $content .= "<ul class='cat-tag'>";
- if(!empty($tags)) {
- foreach ($tags as $tag) {
- $content .= "<li><a href=\"".get_tag_link($tag->term_id)."\">".$tag->name."</a></li>";
- }
- }
- $content .= "</ul>";
- echo $content;
- ?>
个人感觉放到头部调用函数下面比较合适：
- <?php get_header(); ?>
最后，再适当加上样式即可：
- .cat-tag{
- float: left;
- width: 100%;
- }
- .cat-tag li a{
- float: left;
- margin: 0 5px;
- }
获取 WordPress 当前分类文章所有标签
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