获取WordPress当前分类文章所有标签

2016-4-3 23:37 来自知更鸟 8,498 抢沙发 1

[摘要]

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;
}

源代码出自：http://www.ludou.org/wordpress-get-tags-specific-to-category.html

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;
?>