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<?php
/**
* Box packing (3D bin packing, knapsack problem).
*
* @author Doug Wright
*/
declare(strict_types=1);
namespace DVDoug\BoxPacker;
use ArrayIterator;
use IteratorAggregate;
use Traversable;
use function usort;
* List of boxes available to put items into, ordered by volume.
class BoxList implements IteratorAggregate
{
/** @var Box[] */
private array $list = [];
private bool $isSorted = false;
private BoxSorter $sorter;
public function __construct(?BoxSorter $sorter = null)
$this->sorter = $sorter ?: new DefaultBoxSorter();
}
* Do a bulk create.
* @param Box[] $boxes
* @return BoxList
public static function fromArray(array $boxes, bool $preSorted = false): self
$list = new self();
$list->list = $boxes;
$list->isSorted = $preSorted;
return $list;
* @return Traversable<Box>
public function getIterator(): Traversable
if (!$this->isSorted) {
usort($this->list, [$this->sorter, 'compare']);
$this->isSorted = true;
return new ArrayIterator($this->list);
public function insert(Box $item): void
$this->list[] = $item;
dvdoug /
BoxPacker
