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<?php
namespace Nayjest\Collection\Extended;
use Nayjest\Collection\CollectionInterface;
use Nayjest\Collection\CollectionTrait;
use Nayjest\Collection\Collection;
/**
* Collection with deferred initialization (lazy load).
*
* Initialization callback executes when accessing collection items first time.
*/
class LazyLoadCollection implements CollectionInterface
{
use CollectionTrait {
CollectionTrait::items as private itemsInternal;
}
private $initialized = false;
private $initializer;
* Constructor.
* Callback passed to $initializer argument
* will be executed when accessing collection items first time.
* @param callable $initializer callable that returns collection items
public function __construct(callable $initializer)
$this->initializer = $initializer;
protected function &items()
if (!$this->initialized) {
$data = &$this->itemsInternal();
$data = call_user_func($this->initializer);
$this->initialized = true;
return $this->itemsInternal();
* Creates collection of items.
* Override it if you need to implement
* derived collection that requires specific initialization.
* @param array $items
* @return static
protected function createCollection(array $items)
return new Collection($items);
Nayjest /
Collection
