WordPress custom search order by date

wordpress-search-order-by-date.php

<?php
/**
 * Custom search order by Date
 *
 * @param string $orderby Orderby string.
 * @param object $query   The query.
 */
function barrd_sort_search_by_date( $orderby, $query ) {
  global $wpdb;
  if ( ! is_admin() && is_search() ) {
 	  $orderby = "{$wpdb->prefix}posts.post_type ASC, {$wpdb->prefix}posts.post_date DESC";
 	}
 	return  $orderby;
}
add_filter( 'posts_orderby', 'barrd_sort_search_by_date', 10, 2 );