prepare('SELECT `places`.`slug`, `districts`.`slug` as `district`, `cities`.`slug` as `city` FROM `places` INNER JOIN `districts` ON `districts`.`id`=`places`.`district_id` INNER JOIN `cities` ON `districts`.`city_id`=`cities`.`id` UNION SELECT "" as `slug`, `districts`.`slug` as `district`,`cities`.`slug` as `city` FROM `districts` INNER JOIN `cities` ON `districts`.`city_id`=`cities`.`id`'); $sth->bindParam(':sub', $sub,PDO::PARAM_STR); $sth->execute(); $results=$sth->fetchAll(PDO::FETCH_ASSOC); foreach($results as $result){ echo << https://{$config['domain']}/{$result['city']}/{$result['district']}/{$result['slug']} 2018-11-11 monthly 0.9 XML; } ?>