/** * Returns an array containing, for each field, the arary key used for that * field in self::$_fields. * * @return array */ static function &fieldKeys() { if (!self::$_fieldKeys) { self::$_fieldKeys = array('id' => 'id', 'membership_id' => 'membership_id', 'status_id' => 'status_id', 'start_date' => 'start_date', 'end_date' => 'end_date', 'modified_id' => 'modified_id', 'modified_date' => 'modified_date', 'membership_type_id' => 'membership_type_id', 'max_related' => 'max_related'); } return self::$_fieldKeys; }