2 Questions..

1. How get chunk on which you stand?
2. How to realize: Player came to spawn territory (or other chunk) and he get message: "Welcome to spawn"?

idk how to, but i know it's possible.

for the second thing: eg look at factionspro, it has areas & notifications on enter

1.

PHP:

/**@var Player $player*/
$player->getLevel()->getChunk($player->getFloorX() >> 4, $player->getFloorZ() >> 4); #thanks PEMapModder
//returns the player chuck object


2. I don't know if this works or if there is a better way to do this

PHP:

private $inSpawn = array();
public function onMove(PlayerMoveEvent $event){
  $p = $event->getPlayer();
  $s = $p->getLevel()->getSpawnLocation();
  $pos = new Vector3($p->getX(), $p->getY(), $p->getZ());
  $spawn = new Vector3($s->getX(), $s->getY(), $s->getZ();
  if($pos->distance($spawn)) <= $this->getServer()->getSpawnRadius()){
    if(!in_array($p->getName(), $this->inSpawn)){
      $p->sendMessage("Welcome to spawn");
      $this->inSpawn[] = $p->getName();
    }
  }else{
    if(($k = array_search($p->getName(), $this->inSpawn)) !== false){
      unset($this->inSpawn[$k]);
    }
  }
}


edit: compressed version of #2

PHP:

private $inSpawn = [];
public function onMove(PlayerMoveEvent $event){
  $s = $event->getPlayer()->getLevel()->getSpawnLocation();
  if((new Vector3($event->getPlayer()->getX(), $event->getPlayer()->getY(), $event->getPlayer()->getZ()))->distance(new Vector3($s->getX(), $s->getY(), $s->getZ())) <= $this->getServer()->getSpawnRadius()){
    if(!in_array($event->getPlayer()->getName(), $this->inSpawn)){
      $event->getPlayer()->sendMessage("Welcome to spawn");
      $this->inSpawn[] = $event->getPlayer()->getName();
    }
  }else{
    if(($k = array_search($event->getPlayer()->getName(), $this->inSpawn)) !== false){
      unset($this->inSpawn[$k]);
    }
  }
}


Thank you!

No. It is $player->getLevel()->getChunk($player->getFloorX() >> 4, $player->getFloorZ() >> 4)

Thank you. And how I can get chunk id? Example: 89,25

Isn't that the chunk ID?

Sorry. I didn't know one thing. I looked at the WorldEdit (CraftBukkit) code - I learned as they get that "ID" of chunks.

PHP:

$x = 500; // Player's X position
$z = -120; // Player's Z position
$chunk_x = (int) round($x / 16);
$chunk_z = (int) round($z / 16);

That's wrong. You should use >> 4 not / 16, because bit shifting is much faster than division. Also, it should be floor not round. And what do you think happens if the $x and/or $z is/are -1? If you use bit shifting, you need to neither call functions (thus prevent some overhead that is fixed in PHP 5.7), nor to do rounding and division. I am not sure if it works well for extreme coordinates like those in the farlands, though.

-1 >> 4 is still -1 which is what you want. If you want to reduce stuff you can skip the round or floor. $x >> 4 is an int operation only so an int stays an int (no need to floor or cast to (int).