CWizardStep::SaveFile

function SaveFile($name, $arRestriction = Array())
{
	$wizard = $this->GetWizard();
	$deleteFile = $wizard->GetVar($name."_del");
	$wizard->UnSetVar($name."_del");
	$oldFileID = $wizard->GetVar($name);
	$fileNew = $wizard->GetRealName($name."_new");

	if (!array_key_exists($fileNew, $_FILES) || ($_FILES[$fileNew]["name"] == '' && $deleteFile === null))
		return;

	if ($_FILES[$fileNew]["tmp_name"] == '' && $deleteFile === null)
	{
		$this->SetError(GetMessage("MAIN_WIZARD_FILE_UPLOAD_ERROR"), $name."_new");
		return;
	}

	$arFile = $_FILES[$fileNew] + Array(
		"del" => ($deleteFile == "Y" ? "Y" : ""),
		"old_file" => (intval($oldFileID) > 0 ? intval($oldFileID): 0 ),
		"MODULE_ID" => "tmp_wizard"
	);

	$max_file_size = (array_key_exists("max_file_size", $arRestriction) ? intval($arRestriction["max_file_size"]) : 0);
	$max_width = (array_key_exists("max_width", $arRestriction) ? intval($arRestriction["max_width"]) : 0);
	$max_height = (array_key_exists("max_height", $arRestriction) ? intval($arRestriction["max_height"]) : 0);
	$extensions = (array_key_exists("extensions", $arRestriction) && $arRestriction["extensions"] <> '' ? trim($arRestriction["extensions"]) : false);
	$make_preview = (array_key_exists("make_preview", $arRestriction) && $arRestriction["make_preview"] == "Y" ? true : false);

	$error = CFile::CheckFile($arFile, $max_file_size, false, $extensions);
	if ($error <> '')
	{
		$this->SetError($error, $name."_new");
		return;
	}

	if ($make_preview && $max_width > 0 && $max_height > 0)
	{
		$info = (new BitrixMainFileImage($arFile["tmp_name"]))->getInfo();
		if($info)
		{
			if ($info->getWidth() > $max_width || $info->getHeight() > $max_height)
			{
				$success = CWizardUtil::CreateThumbnail($arFile["tmp_name"], $arFile["tmp_name"], $max_width, $max_height);
				if ($success)
					$arFile["size"] = @filesize($arFile["tmp_name"]);
			}
		}
	}
	elseif ($max_width > 0 || $max_height > 0)
	{
		$error = CFile::CheckImageFile($arFile, $max_file_size, $max_width, $max_height);
		if ($error <> '')
		{
			$this->SetError($error, $name."_new");
			return;
		}
	}

	$fileID = (int)CFile::SaveFile($arFile, "tmp");
	if ($fileID > 0)
		$wizard->SetVar($name, $fileID);
	else
		$wizard->UnSetVar($name);

	return $fileID;
}