CIntranetUtils::getSubStructure

static function getSubStructure($sectionId, $depth = false)
{
	global $CACHE_MANAGER;

	static $structures;

	if (empty($structures[intval($sectionId)][intval($depth)]))
	{
		$iblockId = COption::GetOptionInt('intranet', 'iblock_structure', false);
		if ($iblockId <= 0)
			return;

		$cacheDir = '/intranet/structure/branches';
		$cacheId = 'intranet|structure|'.$iblockId.'|branch|'.intval($sectionId).'|'.intval($depth);

		$obCache = new CPHPCache();

		if ($obCache->InitCache(30*86400, $cacheId, $cacheDir))
		{
			$subStructure = $obCache->GetVars();
		}
		else
		{
			$obCache->StartDataCache();

			$CACHE_MANAGER->StartTagCache($cacheDir);

			$CACHE_MANAGER->RegisterTag('iblock_id_'.$iblockId);
			$CACHE_MANAGER->RegisterTag('intranet_users');
			$CACHE_MANAGER->RegisterTag('intranet_department_structure');

			$subStructure = array(
				'TREE' => array(),
				'DATA' => array(),
			);

			$arFilter = array(
				'IBLOCK_ID' => $iblockId,
				'ACTIVE'    => 'Y'
			);

			if ($sectionId > 0)
			{
				if ($depth == 1)
				{
					$arFilter['SECTION_ID'] = $sectionId;
				}
				else
				{
					$dbSection = CIBlockSection::GetList(
						array('LEFT_MARGIN' => 'ASC'),
						array('IBLOCK_ID' => $iblockId, 'ID' => $sectionId, 'ACTIVE' => 'Y'),
						false,
						array('DEPTH_LEVEL', 'LEFT_MARGIN', 'RIGHT_MARGIN')
					);
					if (!empty($dbSection) && ($currentSection = $dbSection->fetch()))
					{
						$arFilter['>=LEFT_MARGIN']  = $currentSection['LEFT_MARGIN'];
						$arFilter['<=RIGHT_MARGIN'] = $currentSection['RIGHT_MARGIN'];
						$arFilter['>DEPTH_LEVEL']   = $currentSection['DEPTH_LEVEL'];
						if ($depth > 0)
							$arFilter['<=DEPTH_LEVEL'] = $currentSection['DEPTH_LEVEL'] + $depth;
					}
				}
			}
			else if ($depth > 0)
			{
				$arFilter['<=DEPTH_LEVEL'] = $depth;
			}

			$dbSections = CIBlockSection::GetList(
				array('LEFT_MARGIN' => 'ASC'),
				$arFilter,
				false,
				array('ID', 'NAME', 'IBLOCK_SECTION_ID', 'UF_HEAD')
			);
			if (!empty($dbSections))
			{
				while ($section = $dbSections->fetch())
				{
					if (empty($section['IBLOCK_SECTION_ID']))
						$section['IBLOCK_SECTION_ID'] = 0;

					if (!isset($subStructure['TREE'][$section['IBLOCK_SECTION_ID']]))
						$subStructure['TREE'][$section['IBLOCK_SECTION_ID']] = array();

					$subStructure['TREE'][$section['IBLOCK_SECTION_ID']][] = $section['ID'];
					$subStructure['DATA'][$section['ID']] = array(
						'ID'                => $section['ID'],
						'NAME'              => $section['NAME'],
						'IBLOCK_SECTION_ID' => $section['IBLOCK_SECTION_ID'],
						'UF_HEAD'           => $section['UF_HEAD']
					);
				}
			}

			$CACHE_MANAGER->EndTagCache();
			$obCache->EndDataCache($subStructure);
		}

		if (!is_array($structures))
			$structures = array();
		if (!isset($structures[intval($sectionId)]) || !is_array($structures[intval($sectionId)]))
			$structures[intval($sectionId)] = array();
		$structures[intval($sectionId)][intval($depth)] = $subStructure;
	}

	return $structures[intval($sectionId)][intval($depth)];
}