collectionbase.php

См. документацию.

<?php
 
namespace Bitrix\Sale\Internals;
 
use Bitrix\Main\Localization\Loc;
 
Loc::loadMessages(__FILE__);

abstract class CollectionBase
    implements \ArrayAccess, \Countable, \IteratorAggregate
{
    protected $collection = array();

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

    public function offsetExists($offset): bool
    {
        return isset($this->collection[$offset]) || array_key_exists($offset, $this->collection);
    }

    #[\ReturnTypeWillChange]
    public function offsetGet($offset)
    {
        if (isset($this->collection[$offset]) || array_key_exists($offset, $this->collection))
        {
            return $this->collection[$offset];
        }
 
        return null;
    }

    public function offsetSet($offset, $value): void
    {
        if($offset === null)
        {
            $this->collection[] = $value;
        }
        else
        {
            $this->collection[$offset] = $value;
        }
    }

    public function offsetUnset($offset): void
    {
        unset($this->collection[$offset]);
    }

    public function count(): int
    {
        return count($this->collection);
    }

    public function current()
    {
        return current($this->collection);
    }

    public function next()
    {
        return next($this->collection);
    }

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

    public function valid()
    {
        $key = $this->key();
        return $key !== null;
    }

    public function rewind()
    {
        return reset($this->collection);
    }

    public function isEmpty()
    {
        return empty($this->collection);
    }
 
    public function toArray()
    {
        $result = [];
 
        foreach ($this->collection as $entity)
        {
            $result[] = $entity->toArray();
        }
 
        return $result;
    }
}