PHP数组分页中如何实现懒加载？

class ArrayPaginator implements Iterator
{
    private $array;
    private $pageSize;
    private $currentPage;

    public function __construct(array $array, int $pageSize)
    {
        $this->array = $array;
        $this->pageSize = $pageSize;
        $this->currentPage = 0;
    }

    public function current()
    {
        return $this->array[$this->currentPage * $this->pageSize];
    }

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

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

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

    public function valid()
    {
        return ($this->currentPage * $this->pageSize) < count($this->array);
    }
}

// 实战案例
$array = range(1, 1000);
$paginator = new ArrayPaginator($array, 10);

foreach ($paginator as $page) {
    // 在此处处理页面数据
    print_r($page);
}