resultiterator.php

<?php
 
namespace Bitrix\Main\DB;
 
use Bitrix\Main\NotSupportedException;
 
class ResultIterator implements \Iterator
{
    private $result;
    private $counter;
    private $currentData;
 
    public function __construct(Result $result)
    {
        $this->result = $result;
        $this->counter = -1;
    }
 
    #[\ReturnTypeWillChange]
    public function current()
    {
        return $this->currentData;
    }
 
    public function next(): void
    {
        $this->currentData = $this->result->fetch();
        $this->counter++;
    }
 
    #[\ReturnTypeWillChange]
    public function key()
    {
        return $this->counter;
    }
 
    public function valid(): bool
    {
        return $this->currentData !== false;
    }
 
    public function rewind(): void
    {
        if ($this->counter > 0)
        {
            throw new NotSupportedException('Could not rewind the iterator');
        }
 
        $this->next();
    }
}