static function removeInstructor()
 {
     $id = $_POST['id'];
     $cursor = Dispatcher::$mysqli->query("select * from instructor where status='default'");
     $row = $cursor->fetch_assoc();
     $defaultInstructorID = $row['Person_id'];
     $default_calendar_id = $row['calendar_id'];
     Dispatcher::$mysqli->query("update custom_intsructor set instructor_id={$defaultInstructorID} where instructor_id={$id}");
     Dispatcher::$mysqli->query("update instructor_has_hours set instructor_id={$defaultInstructorID} where instructor_id={$id}");
     $cursor = Dispatcher::$mysqli->query("select * from instructor where `Person_id`={$id}");
     $row = $cursor->fetch_assoc();
     $prev_calendar_id = $row['calendar_id'];
     $cursor = Dispatcher::$mysqli->query("select * from event where `instructor_Person_id`={$id}");
     $instructorCalendarEvents = new InstructorCalendarEvents();
     while ($row = $cursor->fetch_assoc()) {
         $instructorCalendarEvents->setDefaultInstructor($prev_calendar_id, $row['clndr_event_id'], $default_calendar_id);
     }
     Dispatcher::$mysqli->query("delete from instructor where `Person_id`='{$id}'");
     Dispatcher::$mysqli->query("delete from person where id='{$id}'");
     print_r(Dispatcher::$mysqli->error);
     $instructors_array = self::getInstructors();
     get_instructors_view($instructors_array);
 }