获取WordPress当前分类文章所有标签

    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;

    }

    <?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;

    ?>

<?php get_header(); ?>