获取wordpress文章标签关联的分类

yibin 2016-06-01 WordPress 577

前面介绍的《WordPress获取某分类文章使用过的标签》满足了获取分类关联标签的需求,现在反过来要获取标签关联的分类怎么办?既然可以通过分类获取关联标签,那么也可以通过标签获取关键的分类。通过对前面的函数代码进行简单的修改就可以实现该功能效果

functions.php文件代码:

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<?php
    function ludou_get_tag_categories($args) {
        global $wpdb;
        $categories = $wpdb->get_results
        ("
SELECT DISTINCT terms1.term_id as cat_id
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 $wpdb->terms as terms2 ON t2.term_id = terms2.term_id
WHERE
t1.taxonomy = 'category' AND p1.post_status = 'publish' AND terms2.term_id IN ("
.$args['tags'].") AND
t2.taxonomy = 'post_tag' AND p2.post_status = 'publish'
AND p1.ID = p2.ID
ORDER by cat_id
"
); $count = 0;   if($categories) { foreach ($categories as $category) { $mycategory[$count] = get_term_by('id', $category->cat_id, 'category'); $count++; } } else { $mycategory = NULL; }   return $mycategory; } ?>

调用代码:

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<?php
    // 12,13是标签ID,多个用半角逗号隔开
    $args = array( 'tags' => '12,13');
    // 调用上面定义的函数,来获取ID为12,13的标签的关联分类
    $categories = ludou_get_tag_categories($args);
    // 输出我们获取到的关联分类,以列表形式打印
    $content .= "<ul>";
    if(!empty($categories)) {
      foreach ($categories as $category) {
        $content .= "<li><a href=\"".get_category_link( $category->term_id )."\">".$category->name."</a></li>";
      }
    }
    $content .= "</ul>";
    echo $content;
?>

代码来自:露兜博客

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