$group = Group::getFromDB('users');
$group = Group::getFromDB('users', array('id', 'username'));
$group = Group::getFromDB('users', null, "age > 18");This code retrieves records from the "users" table where the "age" column is greater than 18 and stores them in the $group variable. From the above examples, we can determine that the Group getFromDB function is part of a database utility library that provides an easier way of working with database queries.