A continuación te adjuntamos una rutina imprescindible para cuando hagas tus themes de wordpress. Con esta función, el theme cogerá las categorias como tags automáticamente.
Pega el siguiente código en tu archivo function.php
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;
}
Ahora ya puedes usar estas entradas en tu theme.
$args = array('categories' => '12,13,14');
$tags = get_category_tags($args);
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