collection.php

<?php
 
namespace Bitrix\Location\Entity\Generic;
 
class Collection
    implements \ArrayAccess, \Countable, \Iterator
{
    protected $items = [];
 
    public function  __construct(array  $items = [])
    {
        $this->setItems($items);
    }
 
    public function setItems(array $items): void
    {
        foreach($items as $item)
        {
            $this->addItem($item);
        }
    }
 
    public function getItems(): array
    {
        return $this->items;
    }
 
    public function offsetSet($offset, $value): void
    {
        if ($offset === null)
        {
            $this->items[] = $value;
        }
        else
        {
            $this->items[$offset] = $value;
        }
    }
 
    public function offsetExists($offset): bool
    {
        return isset($this->items[$offset]);
    }
 
    public function offsetUnset($offset): void
    {
        unset($this->items[$offset]);
    }
 
    #[\ReturnTypeWillChange]
    public function offsetGet($offset)
    {
        return isset($this->items[$offset]) ? $this->items[$offset] : null;
    }
 
    public function count(): int
    {
        return count($this->items);
    }
 
    public function rewind(): void
    {
        reset($this->items);
    }
 
    #[\ReturnTypeWillChange]
    public function current()
    {
        return current($this->items);
    }
 
    #[\ReturnTypeWillChange]
    public function key()
    {
        return key($this->items);
    }
 
    public function next(): void
    {
        next($this->items);
    }
 
    public function valid(): bool
    {
        return $this->current() !== false && isset($this->items[$this->key()]);
    }
 
    public function clear()
    {
        $this->items = [];
    }
 
    public function addItem($item): int
    {
        $this->items[] = $item;
        end($this->items);
        return key($this->items);
    }
}