set() public static méthode

public static set ( $index, $data, $data2 = 'NODATAWASSENT' )
 /**
  * Ajax method to store theatre search options to the session.
  *
  * @TODO: should the keys for this not be validated?
  */
 public function actionSetDiaryFilter()
 {
     foreach ($_POST as $key => $value) {
         YiiSession::set('theatre_searchoptions', $key, $value);
     }
 }
 /**
  * Store the filter item in the user session.
  *
  * @param $field
  * @param $value
  */
 public function setFilter($field, $value)
 {
     YiiSession::set('waitinglist_searchoptions', $field, $value);
 }