Битрикс – Построить навигацию для разделов и подразделов

Bitrix - NavChain Sections

$rsSect = CIBlockSection::GetList(
	array(),
	array('IBLOCK_ID' => $arParams["IBLOCK_ID"], '=CODE' => $arResult['VARIABLES']['SECTION_CODE']),
	false,
	array('ID', 'NAME', 'DEPTH_LEVEL', 'SECTION_PAGE_URL')
);
if ( $arSect = $rsSect->GetNext() ) {
	$SEC_LVL = $arSect['DEPTH_LEVEL'];
	$SEC_NAME = $arSect['NAME'];
	$SEC_URL = $arSect['SECTION_PAGE_URL'];
}


if ($SEC_LVL >= 2) {
	$rsSect = CIBlockSection::GetList(
		array(),
		array('IBLOCK_ID' => $arParams["IBLOCK_ID"], '=CODE' => $arResult['VARIABLES']['SECTION_CODE']),
		false,
		array('ID', 'NAME', 'SECTION_PAGE_URL')
	);
	while ( $arSect2 = $rsSect->GetNext() ) {
		$SEC_NAME = $arSect2['NAME'];
		$SEC_URL = $arSect2['SECTION_PAGE_URL'];
		break;
	}

	$result = array();
	$ibsTreeResource = CIBlockSection::GetNavChain( false, $arSect2['ID'], array( "ID", "NAME") );
	$c = 0;
	while($sectionItem = $ibsTreeResource->Fetch()){
		$result[$c]['NAME'] = $sectionItem['NAME'];
		$res = CIBlockSection::GetByID($sectionItem["ID"]);
		if($ar_res = $res->GetNext()) {
			$url = $ar_res['SECTION_PAGE_URL'];
		}
		$result[$c]['URL'] = $url;
		$c++;
	}

	foreach ($result as $arItem) {
		$APPLICATION->AddChainItem($arItem['NAME'], $arItem['URL']);
	}
} else {
	$APPLICATION->AddChainItem($SEC_NAME, $SEC_URL);
}