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Get tags related to category

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  1. //to go in functions.php
  2.  
  3. function get_category_tags($args) {
  4. 	global $wpdb;
  5. 	$tags = $wpdb->get_results
  6. 	("
  7. 		SELECT DISTINCT terms2.term_id as tag_id, terms2.name as tag_name, null as tag_link
  8. 		FROM
  9. 			wp_posts as p1
  10. 			LEFT JOIN wp_term_relationships as r1 ON p1.ID = r1.object_ID
  11. 			LEFT JOIN wp_term_taxonomy as t1 ON r1.term_taxonomy_id = t1.term_taxonomy_id
  12. 			LEFT JOIN wp_terms as terms1 ON t1.term_id = terms1.term_id,
  13.  
  14. 			wp_posts as p2
  15. 			LEFT JOIN wp_term_relationships as r2 ON p2.ID = r2.object_ID
  16. 			LEFT JOIN wp_term_taxonomy as t2 ON r2.term_taxonomy_id = t2.term_taxonomy_id
  17. 			LEFT JOIN wp_terms as terms2 ON t2.term_id = terms2.term_id
  18. 		WHERE
  19. 			t1.taxonomy = 'category' AND p1.post_status = 'publish' AND terms1.term_id IN (".$args['categories'].") AND
  20. 			t2.taxonomy = 'post_tag' AND p2.post_status = 'publish'
  21. 			AND p1.ID = p2.ID
  22. 		ORDER by tag_name
  23. 	");
  24. 	$count = 0;
  25. 	foreach ($tags as $tag) {
  26. 		$tags[$count]->tag_link = get_tag_link($tag->tag_id);
  27. 		$count++;
  28. 	}
  29. 	return $tags;
  30. }
  31.  
  32. // template tag
  33.  
  34. $args = array('categories' => '12,13,14');
  35. $tags = get_category_tags($args);

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