Iterator w php

https://www.php.net/manual/en/class.iteratoraggregate.php

https://www.php.net/manual/en/class.arrayiterator.php

class CarsIterator implements Iterator {
	private $position = 0;
	private $cars = ['BMW', 'Audi', 'KIA', 'Opel', 'Ford'];

	public function current() {
		return $this->cars[$this->position];
	}

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

	public function next() {
		$this->position++;
	}

	public function rewind() {
		$this->position = 0;
	}

	public function valid() {
		if (isset($this->cars[$this->position])) {
			return true;
		}

		return false;
	}
	public function reverse() {
		$this->cars = array_reverse($this->cars, true);
	}
}

$tests = new CarsIterator();

var_dump($tests->current());

$tests->next();
$tests->next();
$tests->next();
$tests->next();
$tests->next();

var_dump($tests->current());