facetwp put zero price last.php

<?php

add_filter( 'facetwp_filtered_post_ids', 'car_zero_priced_last', 10, 2);
function car_zero_priced_last( $post_ids, $class ) {
	
	if (!isset($class->ajax_params['http_params']['get']['fwp_sort'])) {
		return $post_ids;
	}
	if (isset($class->ajax_params['http_params']['get']['fwp_sort']) && $class->ajax_params['http_params']['get']['fwp_sort'] != 'price_asc') {
		return $post_ids;
	}

    global $wpdb;
    // Lookup non-zero priced post IDs
    $sql_non_zero = "
    SELECT post_id
    FROM {$wpdb->prefix}postmeta
    WHERE meta_key = 'price' AND meta_value > 0 AND post_id IN (" . implode( ',', $post_ids ) . ") ORDER BY CAST(meta_value AS int) ASC";
	
    
	$results_non_zero = $wpdb->get_col( $sql_non_zero );
	
	$sql_zero = "
    SELECT post_id
    FROM {$wpdb->prefix}postmeta
    WHERE meta_key = 'price' AND meta_value = 0 AND post_id IN (" . implode( ',', $post_ids ) . ") ORDER BY post_id";
	
    
	$results_zero = $wpdb->get_col( $sql_zero );
		
	// merge the 2 results
    $post_ids = array_merge( $results_non_zero, $results_zero );
		
    return $post_ids;
}