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functions.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：

<?php get_header(); ?>

下面比较合适。

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;
}

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