result.php

См. документацию.

<?php
 
use Bitrix\Catalog;
 
class CCatalogResult extends CDBResult
{
    private $entity = null;
 
    private $fields = array();
    private $resultKeys = array();
    private $erasedKeys = array();
 
    public function __construct($entity, $result = null)
    {
        parent::__construct($result);
 
        $this->entity = new $entity;
 
        $this->resultKeys = array();
 
        $this->fields = $this->entity->getCachedFieldList();
        if (!empty($this->fields))
            $this->resultKeys = array_fill_keys($this->fields, true);
    }
 
    public function setResult($result)
    {
        parent::__construct($result);
    }
 
    public function prepareSelect(array $select)
    {
        $this->erasedKeys = array();
        if (
            empty($select)
            || (is_string($select) && $select == '*')
            || (is_array($select) && in_array('*', $select))
        )
            return $select;
        foreach ($this->fields as $field)
        {
            $index = array_search($field, $select);
            if ($index !== false)
                continue;
 
            $select[] = $field;
            $this->erasedKeys[$field] = true;
        }
        unset($index, $field);
 
        return $select;
    }
 
    public function Fetch()
    {
        $row = parent::Fetch();
 
        if (!isset($this) || !is_object($this))
            return $row;
 
        if (empty($row))
        {
            $this->erasedKeys = array();
            return $row;
        }
 
        if (empty($this->fields))
            return $row;
 
        if (isset($row['ID']))
        {
            $this->entity->setCacheItem($row['ID'], $row);
            if (!empty($this->erasedKeys))
                $row = array_diff_key($row, $this->erasedKeys);
        }
 
        return $row;
    }
}