woocommerce show out of stock products last

1/**
2* Sorting out of stock WooCommerce products - Order product collections by stock status, in-stock products first.
3*/
4class iWC_Orderby_Stock_Status
5{
6public function __construct()
7{
8// Check if WooCommerce is active
9if (in_array('woocommerce/woocommerce.php', apply_filters('active_plugins', get_option('active_plugins')))) {
10add_filter('posts_clauses', array($this, 'order_by_stock_status'), 2000);
11}
12}
13public function order_by_stock_status($posts_clauses)
14{
15global $wpdb;
16// only change query on WooCommerce loops
17if (is_woocommerce() && (is_shop() || is_product_category() || is_product_tag())) {
18$posts_clauses['join'] .= " INNER JOIN $wpdb->postmeta istockstatus ON ($wpdb->posts.ID = istockstatus.post_id) ";
19$posts_clauses['orderby'] = " istockstatus.meta_value ASC, " . $posts_clauses['orderby'];
20$posts_clauses['where'] = " AND istockstatus.meta_key = '_stock_status' AND istockstatus.meta_value <> '' " . $posts_clauses['where'];
21}
22return $posts_clauses;
23}
24}
25new iWC_Orderby_Stock_Status;
26/**
27* END - Order product collections by stock status, instock products first.
28*/
29