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wordpress主题如何获取同一标签下的关联分类

高时银博客 wordpress CMS主题制作 点击: 1,418 次 0 1
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  • 在开发wordpress主题的过程中,我们可能会有这样的需求,既然可以获取某个分类的关联标签,那么,我们能获取某个标签的关联分类吗?答案是肯定的。以下提供一个获取同一标签下的关联分类的函数:

    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;
    }

    下面是一个简单的函数调用范例:

    $args = array( 'tags' => '12,13');// 定义一个tag数据,存放多个tagID,12,13是标签ID,多个用英文逗号隔开
    $categories = ludou_get_tag_categories($args);// 调用上面定义的函数,来获取ID为12,13的标签的关联分类
    // 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;

    通过上面的代码,我们在wordpress主题中实现了调用同一标签下的关联分类,并列举了一个简单案例,当然,你还可以更加深入一点。


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