获取基于特定类别的所有标签（包括来自子类别和帖子的所有标签）wordpress

Question

我想在 single.php 上使用 wp_tag_cloud() 使用参数来获取来自特定类别的所有标签，包括来自其子类别和帖子的所有标签。

Answer 1

Wordpress 中没有本地方式来执行此操作。原因是标签与类别无关，它们是独立的。话虽如此，获取特定类别的所有标签的唯一方法是循环浏览该类别的每个帖子并获取每个帖子的标签。

为此，我编写了一个快速函数。

将此函数放入您的functions.php文件中。

function get_tags_in_use($category_ID, $type = 'name'){
    // Set up the query for our posts
    $my_posts = new WP_Query(array(
      'cat' => $category_ID, // Your category id
      'posts_per_page' => -1 // All posts from that category
    ));

    // Initialize our tag arrays
    $tags_by_id = array();
    $tags_by_name = array();
    $tags_by_slug = array();

    // If there are posts in this category, loop through them
    if ($my_posts->have_posts()): while ($my_posts->have_posts()): $my_posts->the_post();

      // Get all tags of current post
      $post_tags = wp_get_post_tags($my_posts->post->ID);

      // Loop through each tag
      foreach ($post_tags as $tag):

        // Set up our tags by id, name, and/or slug
        $tag_id = $tag->term_id;
        $tag_name = $tag->name;
        $tag_slug = $tag->slug;

        // Push each tag into our main array if not already in it
        if (!in_array($tag_id, $tags_by_id))
          array_push($tags_by_id, $tag_id);

        if (!in_array($tag_name, $tags_by_name))
          array_push($tags_by_name, $tag_name);

        if (!in_array($tag_slug, $tags_by_slug))
          array_push($tags_by_slug, $tag_slug);

      endforeach;
    endwhile; endif;

    // Return value specified
    if ($type == 'id')
        return $tags_by_id;

    if ($type == 'name')
        return $tags_by_name;

    if ($type == 'slug')
        return $tags_by_slug;
}

然后当你想抓取特定类别的标签时，像这样调用这个函数：

// First paramater is the category and the second paramater is how to return the tag (by name, by id, or by slug)
// Leave second paramater blank to default to name

$tags = get_tags_in_use(59, 'name');

希望这会有所帮助。

编辑：

这是您需要与其他功能一起使用的功能：

function tag_cloud_by_category($category_ID){
    // Get our tag array
    $tags = get_tags_in_use($category_ID, 'id');

    // Start our output variable
    echo '<div class="tag-cloud">';

    // Cycle through each tag and set it up
    foreach ($tags as $tag):
        // Get our count
        $term = get_term_by('id', $tag, 'post_tag');
        $count = $term->count;

        // Get tag name
        $tag_info = get_tag($tag);
        $tag_name = $tag_info->name;

        // Get tag link
        $tag_link = get_tag_link($tag);

        // Set up our font size based on count
        $size = 8 + $count;

        echo '<span style="font-size:'.$size.'px;">';
        echo '<a href="'.$tag_link.'">'.$tag_name.'</a>';
        echo ' </span>';

    endforeach;

    echo '</div>';
}

所以你可以像这样使用这个函数：

tag_cloud_by_category($cat_id);

Answer 2

在你的主题的functions.php中插入以下函数：

function get_category_tags($args) {
    global $wpdb;
    $tags = $wpdb->get_results
    ("
        SELECT DISTINCT terms2.term_id as tag_id, terms2.name as tag_name, null as tag_link
        FROM
            wp_posts as p1
            LEFT JOIN wp_term_relationships as r1 ON p1.ID = r1.object_ID
            LEFT JOIN wp_term_taxonomy as t1 ON r1.term_taxonomy_id = t1.term_taxonomy_id
            LEFT JOIN wp_terms as terms1 ON t1.term_id = terms1.term_id,

            wp_posts as p2
            LEFT JOIN wp_term_relationships as r2 ON p2.ID = r2.object_ID
            LEFT JOIN wp_term_taxonomy as t2 ON r2.term_taxonomy_id = t2.term_taxonomy_id
            LEFT JOIN wp_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
    ");
    $count = 0;
    foreach ($tags as $tag) {
        $tags[$count]->tag_link = get_tag_link($tag->tag_id);
        $count++;
    }
    return $tags;
}

在您的主题文档中调用该函数，如下所示。请注意，它接受多个类别 ID：

 $args = array(
        'categories'                => '12,13,14'
    );

$tags = get_category_tags($args);

这将返回一个数组，您可以使用它执行以下操作：

$content .= "<ul>";
foreach ($tags as $tag) {
    $content .= "<li><a href=\"$tag->tag_link\">$tag->tag_name</a></li>";
}
$content .= "</ul>";
echo $content;

Answer 3

我越来越接近这个了。

<div class="tag_cloud_on_single">

    <h2>Popular Topics</h2>

    <?php

    $category = get_the_category();
    $root_cat_of_curr =  $category[0]->category_parent;

    function get_cat_slug($cat_id) {
        $cat_id = (int) $cat_id;
        $category = &get_category($cat_id);
        return $category->slug;
    }

    $my_cat = get_cat_slug($root_cat_of_curr);

    $custom_query = new WP_Query('posts_per_page=-1&category_name='.$my_cat.'');
    if ($custom_query->have_posts()) :
        while ($custom_query->have_posts()) : $custom_query->the_post();
            $posttags = get_the_tags();
            if ($posttags) {
                foreach($posttags as $tag) {
                    $all_tags[] = $tag->term_id;
                }
            }
        endwhile;
    endif;

    $tags_arr = array_unique($all_tags);
    $tags_str = implode(",", $tags_arr);

    $args = array(
        'smallest'                  => 12, 
        'largest'                   => 24,
        'unit'                      => 'pt', 
        'number'                    => 0,  
        'format'                    => 'flat',
        'separator'                 => "&nbsp;&nbsp;&nbsp;",
        'orderby'                   => 'name', 
        'order'                     => 'RAND',
        'exclude'                   => null,  
        'topic_count_text_callback' => default_topic_count_text,
        'link'                      => 'view', 
        'echo'                      => true,
        'include'                   => $tags_str
    );

    wp_tag_cloud($args);

    ?>

</div>

感谢大家的贡献。感谢您的帮助。