section.php

<?php
namespace Bitrix\Iblock\Copy\Implement\Children;
 
use Bitrix\Main\Error;
use Bitrix\Main\Result;
 
class Section implements Child
{
    private $result;
 
    private $sectionsRatio = [];
 
    public function __construct()
    {
        $this->result = new Result();
    }
 
    public function getSectionsRatio($iblockId = 0): array
    {
        return (isset($this->sectionsRatio[$iblockId]) ? $this->sectionsRatio[$iblockId] : $this->sectionsRatio);
    }
 
    public function copy($iblockId, $copiedIblockId): Result
    {
        $sectionObject = new \CIBlockSection;
 
        $sections = $this->getSections($iblockId, $copiedIblockId);
        $parentRatioIds = $this->getParentRatioIds($sections);
        $ratioIds = $this->addSections($sectionObject, $sections);
        $this->updateSections($sectionObject, $parentRatioIds, $ratioIds);
        $this->setRatios($iblockId, $ratioIds);
 
        return $this->result;
    }
 
    private function getSections($iblockId, $copiedIblockId)
    {
        $sections = [];
 
        $queryObject = \CIBlockSection::getList([], ["IBLOCK_ID" => $iblockId, "CHECK_PERMISSIONS" => "N"], false);
        while ($section = $queryObject->fetch())
        {
            $section["IBLOCK_ID"] = $copiedIblockId;
            $sections[] = $section;
        }
 
        return $sections;
    }
 
    private function getParentRatioIds(array $sections): array
    {
        $oldRatioIds = [];
        foreach ($sections as $section)
        {
            if (!empty($section["IBLOCK_SECTION_ID"]))
            {
                $oldRatioIds[$section["ID"]] = $section["IBLOCK_SECTION_ID"];
            }
        }
        return $oldRatioIds;
    }
 
    private function addSections(\CIBlockSection $sectionObject, array $sections): array
    {
        $rationIds = [];
        foreach ($sections as $section)
        {
            unset($section["IBLOCK_SECTION_ID"]);
            $rationIds[$section["ID"]] = $this->addSection($sectionObject, $section);
        }
 
        return $rationIds;
    }
 
    private function updateSections(\CIBlockSection $sectionObject, array $parentRatioIds, array $ratioIds)
    {
        foreach ($parentRatioIds as $parentId => $childId)
        {
            if (array_key_exists($parentId, $ratioIds) && array_key_exists($childId, $ratioIds))
            {
                $copiedSectionId = $ratioIds[$parentId];
                $sectionObject->update($copiedSectionId, ["IBLOCK_SECTION_ID" => $ratioIds[$childId]]);
            }
        }
    }
 
    private function addSection(\CIBlockSection $sectionObject, $section)
    {
        $result = $sectionObject->add($section);
        if (!$result)
        {
            if ($sectionObject->LAST_ERROR)
            {
                $this->result->addError(new Error($sectionObject->LAST_ERROR));
            }
            else
            {
                $this->result->addError(new Error("Unknown error while copying section"));
            }
        }
        return $result;
    }
 
    private function setRatios($iblockId, array $ratioIds)
    {
        $this->sectionsRatio[$iblockId] = $ratioIds;
    }
}