optimize code

				$stmt2 = $queryCalendarObjects->execute();

				if ($row2 = $stmt2->fetch(\PDO::FETCH_ASSOC)) {

					$vObject = Reader::read($row2["calendardata"]);

					foreach ($vObject->VEVENT->ATTENDEE as $attendee1) {

						$attendee = substr($attendee1, 7);

						if ($attendee == $sender) {

							$attendeeName = empty($attendee1["CN"])

								? $sender

								: $attendee1["CN"];

							break;

						}

					}