獲取所有基於特定類別的標籤（包括來自子類別和帖子的所有標籤）wordpress

Question

我想在single.php上使用wp_tag_cloud（），它使用從特定類別獲取所有標籤的參數，包括其子類別中的所有標籤，帖子。

Answer 1

我得到這個接近。

<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> 

謝謝大家的貢獻。感謝你的幫助。

Answer 2

在Wordpress中沒有本地的方式來做到這一點。原因是標籤與類別無關，它們是分開的。也就是說，讓特定類別使用所有標籤的唯一方法是循環訪問類別的每個帖子，並獲取每個帖子的標籤。

我已經寫了一個快速的功能來做到這一點。

將此函數放入您的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; 
} 

然後，當你想抓住一個特定類別的標籤，調用這個函數像這樣：

// 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'); 

希望這有助於。

編輯：

這是你需要結合使用與其他功能：

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，你可以使用這個功能只需像這樣：

tag_cloud_by_category($cat_id); 

Answer 3

在你的主題的功能.php插入以下功能：

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; 
} 

在您的主題文檔中調用如下函數。注意它接受多個類別的ID：

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

$tags = get_category_tags($args); 

這將返回一個數組，你可以做以下幾點：

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