如何根据库存对 WordPress 网站产品进行排序

hi
I have a WooCommerce store website. I use this code to sort products based on inventory. But the code has an error. It dosent work corretct.please guide me. How to sort WordPress site products based on inventory?

我尝试过的：

add_action('init', function() {
	if( isset($_GET['update_products_arv']) ) {
		$products = wc_get_products( [ 'limit' => 500,'offset' => 200] );
		foreach( $products as $product ){
			$total_stock = $product->get_stock_quantity() ? : 0;
			if( $product->is_type( 'variable' ) ){
				$variations = $product->get_children();
				if( !$variations ) continue;
				foreach ($variations as $variation_id) {
					$variation = wc_get_product( $variation_id );
					$total_stock += $variation->get_stock_quantity() ? : 0;
				}
			}
			update_post_meta($product->get_id(), 'xx_stock', $total_stock);
		}
	}
});

add_action('woocommerce_product_query', function($q) {
	if( ! is_admin() ) {
		$q->set('orderby', 'meta_value_num');
		$q->set('meta_key', 'xx_stock');
		$q->set('order', 'DESC');
	}
});