OnlinePlayerIterator.php

OnlinePlayerIterator.php

<?php

declare(strict_types=1);

final class Player{

	/** @var int */
	public $id;

	/** @var bool */
	public $connected = true;

	public function __construct(int $id){
		$this->id = $id;
	}

	public function isConnected() : bool{
		return $this->connected;
	}
}

final class OnlinePlayerIterator implements Iterator{

	/**
	 * @var Iterator
	 * @phpstan-var Iterator<Player>
	 */
	private $iterator;

	/**
	 * @param Iterator $iterator
	 *
	 * @phpstan-param Iterator<Player>
	 */
	public function __construct(Iterator $iterator){
		$this->iterator = $iterator;
	}

	public function current() : Player{
		return $this->iterator->current();
	}

	public function rewind() : void{
		$this->iterator->rewind();
	}

	public function next() : void{
		$this->iterator->next();
	}

	public function key(){
		$this->iterator->key();
	}

	public function valid() : bool{
		while($this->iterator->valid()){
			if($this->current()->isConnected()){
				return true;
			}
			$this->next();
		}
		return false;
	}
}


$players = [];
for($i = 0; $i < 10; $i++){
	$players[] = new Player($i);
}

foreach(array_rand($players, 3) as $remove){
	echo "Setting #", $players[$remove]->id, " offline", PHP_EOL;
	$players[$remove]->connected = false;
}

foreach(new OnlinePlayerIterator(new ArrayIterator($players)) as $player){
	echo "Traversed #", $player->id, PHP_EOL;
	assert($player->isConnected());
}

Setting #2 offline
Setting #6 offline
Setting #8 offline
Traversed #0
Traversed #1
Traversed #3
Traversed #4
Traversed #5
Traversed #7
Traversed #9