Get Tags For Posts In Selected Categories

The code below will return all Terms that are in the taxonomy ‘post_tags’ and are associated with Posts in selected categories.

 

<?php
/* Retrieve all tags from posts in selected categories */

$cats = array('beaches','mountains');  // Must be an array even if only one category
$cats_string = "'" . implode($cats,"','") . "'";
$sql = <<<EOSQL
SELECT DISTINCT t.*
FROM $wpdb->posts p
JOIN $wpdb->term_relationships tr ON p.ID = tr.object_id
JOIN $wpdb->term_taxonomy tt ON (tr.term_taxonomy_id = tt.term_taxonomy_id
       AND tt.taxonomy = 'post_tag')
JOIN $wpdb->terms t ON tt.term_id = t.term_id
WHERE
   p.ID IN (
      SELECT p2.ID
      FROM $wpdb->posts p2
      JOIN $wpdb->term_relationships tr2 ON p2.ID = tr2.object_id
      JOIN $wpdb->term_taxonomy tt2 ON (tr2.term_taxonomy_id = tt2.term_taxonomy_id AND tt2.taxonomy = 'category')
      JOIN $wpdb->terms t2 ON (tt2.term_id = t2.term_id AND t2.name IN ($cats_string))
      WHERE p2.post_type = 'post'
      AND p2.post_status = 'publish'
      AND p2.post_date <= NOW()
   )
EOSQL;

$terms = $wpdb->get_results($sql);

// print_r($terms);

echo "<br />";
foreach ($terms as $term) {
   echo "ID:$term->term_id NAME:$term->name SLUG:$term->slug<br />";
}

?>

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