/** * Returns an array containing, for each field, the arary key used for that * field in self::$_fields. * * @access public * @return array */ static function &fieldKeys() { if (!self::$_fieldKeys) { self::$_fieldKeys = array('id' => 'id', 'booking_id' => 'booking_id', 'item_id' => 'item_id', 'quantity' => 'quantity', 'is_cancelled' => 'is_cancelled', 'is_deleted' => 'is_deleted'); } return self::$_fieldKeys; }