/**
  * Deletes already delivered files
  * @param array $file_id_array An array containing database ids of the delivered files
  * @param numeric $user_id The database id of the user
  * @access	public
  */
 function deleteDeliveredFiles($a_eph_id, $a_ass_id, $file_id_array, $user_id)
 {
     ilEphAssignment::deleteDeliveredFiles($a_eph_id, $a_ass_id, $file_id_array, $user_id);
     // Finally update status 'returned' of member if no file exists
     if (!count(ilEphAssignment::getDeliveredFiles($a_eph_id, $a_ass_id, $user_id))) {
         ilEphAssignment::updateStatusReturnedForUser($a_ass_id, $user_id, 0);
     }
 }