collectionfilteriterator.php

См. документацию.

<?php
 
namespace Bitrix\Sale\Internals;
class CollectionFilterIterator extends \FilterIterator
{
    protected $callback = null;

    public function __construct(\Iterator $iterator, $callback)
    {
        $this->callback = $callback;
 
        parent::__construct($iterator);
    }

    #[\ReturnTypeWillChange]
    public function accept()
    {
        return call_user_func($this->callback, parent::current());
    }

    public function count()
    {
        return iterator_count($this);
    }
}