get player in the world

Hello I wanted to know how do I know how many players there are in a world with a variable thanks!

I think it's

PHP:

$this->getServer()->getLevel("name")->getPlayers();

I need to import something?

No

Wrong, it should be "getLevelByName()"
Or if you already have the "Level Object" do:

PHP:

$level->getOnlinePlayers();


This returns a "Player array" type, you can use "count" to count the number of entries, and a "foreach" loop to access each player object

PHP:

public Player[] pocketmine\Server::getOnlinePlayers(): exists;
public Player[] pocketmine\level\Level::getPlayers(): exists;
public * pocketmine\level\Level::getOnlinePlayers(): doesn't exist;

Oops xD