arrayresult.php

См. документацию.

<?php
namespace Bitrix\Main\DB;
class ArrayResult extends Result
{
    protected $resource;

    public function __construct($result)
    {
        parent::__construct($result);
    }

    public function getSelectedRowsCount()
    {
        return count($this->resource);
    }

    public function getFields()
    {
        return null;
    }

    protected function fetchRowInternal()
    {
        $val = current($this->resource);
        next($this->resource);
        return $val;
    }
}