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public static function getUsers($param)
{
  $userObject = Yii::app()->getModule('user')->getAUsers(array(
    'order'    => 'profile.lastname',
    'condition'=>'profile.department_id IN ('.implode(',', $param).')',
  ));

  $users = CHtml::listData($userObject, 'id', 'profile.lastname');

  return $users;
}