for::clearRecycle

static function clearRecycle(?int $days = null): string
{
	Rights::setGlobalOff();

	$days = !is_null($days)
			? $days
			: (int) Manager::getOption('deleted_lifetime_days');

	$date = new DateTime;
	$date->add('-' . $days . ' days');

	// check folders to delete
	$foldersToDelete = [-1];
	$res = Folder::getList([
		'select' => [
			'ID'
		],
		'filter' => [
			'=DELETED' => 'Y',
			' $date
		]
	]);
	while ($row = $res->fetch())
	{
		$foldersToDelete[] = $row['ID'];
		$foldersToDelete = array_merge($foldersToDelete, self::getSubFolders($row['ID']));
	}

	// first delete landings
	$res = Landing::getList([
		'select' => [
			'ID', 'FOLDER_ID'
		],
		'filter' => [
			[
				'LOGIC' => 'OR',
				[
					'=DELETED' => 'Y',
					' $date
				],
				[
					'=SITE.DELETED' => 'Y',
					' $date
				],
				[
					'FOLDER_ID' => $foldersToDelete
				]
			],
			'=DELETED' => ['Y', 'N'],
			'=SITE.DELETED' => ['Y', 'N'],
			'CHECK_PERMISSIONS' => 'N'
		],
		'order' => [
			'DATE_MODIFY' => 'desc'
		]
	]);
	while ($row = $res->fetch())
	{
		Lock::lockDeleteLanding($row['ID'], false);
		Landing::delete($row['ID'], true)->isSuccess();
	}

	// delete folders
	foreach (array_unique($foldersToDelete) as $folderId)
	{
		if ($folderId > 0)
		{
			Folder::delete($folderId)->isSuccess();
		}
	}

	// then delete sites
	$res = Site::getList([
		'select' => [
			'ID'
		],
		'filter' => [
			'=DELETED' => 'Y',
			' $date,
			'CHECK_PERMISSIONS' => 'N'
		],
		'order' => [
			'DATE_MODIFY' => 'desc'
		]
	]);
	while ($row = $res->fetch())
	{
		Lock::lockDeleteSite($row['ID'], false);
		Site::delete($row['ID'])->isSuccess();
	}

	Rights::setGlobalOn();

	return __CLASS__ . '::' . __FUNCTION__ . '();';
}