getting all the blocks above a certain height

I have this:

PHP:

  public function checkVoid(PlayerMoveEvent $event){
    $player = $event->getPlayer();
    $x = $this->getServer()->getDefaultLevel()->getSafeSpawn()->getFloorX();
    $y = $this->getServer()->getDefaultLevel()->getSafeSpawn()->getFloorZ();
    $z = $this->getServer()->getDefaultLevel()->getSafeSpawn()->getFloorZ();
    $level = $this->getServer()->getDefaultLevel();
    if($event->getTo()->getFloorY() < 122){;

so when a player moves above Y 122 I want to get all the blocks in $level above Y 122 and foreach block get id and position,
how can this be done?

 

getting all the blocks in the world above Y 122. this wouldn't have any lag because I know that in the world there are only 2 blocks above Y 122. or is air a block?

 

PHP:

  public function checkVoid(PlayerMoveEvent $event){
    $player = $event->getPlayer();
    $x = $this->getServer()->getDefaultLevel()->getSafeSpawn()->getFloorX();
    $y = $this->getServer()->getDefaultLevel()->getSafeSpawn()->getFloorZ();
    $z = $this->getServer()->getDefaultLevel()->getSafeSpawn()->getFloorZ();
    $level = $this->getServer()->getDefaultLevel();
    if($event->getTo()->getFloorY() < 122){;
    
    foreach($level->getBlock->getId() < 122 as $b){
        $X = $b->getX();
        $Y = $b->getY();
        $Z = $b->getZ();
        $pos = new Vector3($X-1, $Y, $Z);
        $level->setBlock($pos, $b, false, false);

this didn't work

 

whoops, i meant to use '> 122' not '< 122'