function get_order_ids_from_bought_items( $product_ids = 0, $customer_id = 0 ) {
global $wpdb;
$customer_id = $customer_id == 0 || $customer_id == '' ? get_current_user_id() : $customer_id;
$statuses = array_map( 'esc_sql', wc_get_is_paid_statuses() );
if ( is_array( $product_ids ) )
$product_ids = implode(',', $product_ids);
if ( $product_ids != ( 0 || '' ) )
$meta_query_line = "AND woim.meta_value IN ($product_ids)";
else
$meta_query_line = "AND woim.meta_value != 0";
// Get Orders IDs
$results = $wpdb->get_col( "
SELECT DISTINCT p.ID FROM {$wpdb->prefix}posts AS p
INNER JOIN {$wpdb->prefix}postmeta AS pm ON p.ID = pm.post_id
INNER JOIN {$wpdb->prefix}woocommerce_order_items AS woi ON p.ID = woi.order_id
INNER JOIN {$wpdb->prefix}woocommerce_order_itemmeta AS woim ON woi.order_item_id = woim.order_item_id
WHERE p.post_status IN ( 'wc-" . implode( "','wc-", $statuses ) . "' )
AND pm.meta_key = '_customer_user'
AND pm.meta_value = $customer_id
AND woim.meta_key IN ( '_product_id', '_variation_id' )
$meta_query_line
" );
// Return an array of Order IDs or an empty array
return sizeof($results) > 0 ? $results : array();
}