$criteria = new Criteria(); $criteria->addAscendingOrderByColumn('last_name');
$criteria = new Criteria(); $criteria->addDescendingOrderByColumn('last_name');This would set the sorting order to descending for the "last_name" column. The setOrder method is part of the Propel package, which is a PHP ORM (Object-Relational Mapping) library. It allows you to map database tables to PHP classes and perform CRUD (Create, Read, Update, Delete) operations on them using object-oriented programming techniques.