collection.php

См. документацию.

<?php
namespace Bitrix\Sale\Exchange\Integration\Service\Internal\Container;
 
use Traversable;
 
class Collection
    implements \IteratorAggregate
{
    protected $collection = [];
    static $internalIndex = 0;
 
    public function addItem(Item $item)
    {
        $index = $item->getInternalIndex() == '' ? 'n'.static::$internalIndex++ : $item->getInternalIndex();
 
        $this->collection[$index] = $item;
    }
 
    public function count()
    {
        return count($this->collection);
    }
 
    public function toArray()
    {
        $result = [];
        if(count($this->collection)>0)
        {
            foreach ($this->collection as $index=>$item)
            {
                $result[$index] = $item->getEntity()->getFieldsValues();
            }
        }
        return $result;
    }
 
    public function getIndexes()
    {
        return count($this->collection)>0 ? array_keys($this->collection):[];
    }

    public function getItemByIndex($index)
    {
        $result = null;
        if(count($this->collection)>0)
        {
            foreach ($this->collection as $k=>$item)
            {
                if($index == $k)
                {
                    $result = $item;
                    break;
                }
            }
        }
        return $result;
    }

    public function getIterator()
    {
        return new \ArrayIterator($this->collection);
    }
}