Get all Tags by product_cat woocomerce

In function.php

function get_category_tags($args) {
global $wpdb;
$tags = $wpdb->get_results
SELECT DISTINCT terms2.term_id as tag_id, as tag_name, null as tag_link
wp_posts as p1
LEFT JOIN wp_term_relationships as r1 ON p1.ID = r1.object_ID
LEFT JOIN wp_term_taxonomy as t1 ON r1.term_taxonomy_id = t1.term_taxonomy_id
LEFT JOIN wp_terms as terms1 ON t1.term_id = terms1.term_id,
wp_posts as p2
LEFT JOIN wp_term_relationships as r2 ON p2.ID = r2.object_ID
LEFT JOIN wp_term_taxonomy as t2 ON r2.term_taxonomy_id = t2.term_taxonomy_id
LEFT JOIN wp_terms as terms2 ON t2.term_id = terms2.term_id
t1.taxonomy = 'product_cat' AND p1.post_status = 'publish' AND terms1.term_id IN (".$args['categories'].") AND
t2.taxonomy = 'product_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; }

in theme

$args = array('categories'=> '3');
$tags = get_category_tags($args);
$content .= "<ul>";
foreach ($tags as $tag) {
$content .= "<li><a href=\"$tag->tag_link\">$tag->tag_name</a></li>";
$content .= "</ul>";
echo $content;

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