php下载文件如何设置文件名

PHP SDK文档：
https://help.aliyun.com/document_detail/32104.html?spm=5176.product8314910_31815.6.378.Yn03UD

PHP下载的代码
function getObjectToLocalFile($ossClient, $bucket)
{
    $object = "a.zip";
    $localfile = "a.zip;
    $options = array(
        OssClient::OSS_FILE_DOWNLOAD => $localfile,
    );
    try{
        $ossClient->getObject($bucket, $object, $options);
    } catch(OssException $e) {
        printf(__FUNCTION__ . ": FAILED\n");
        printf($e->getMessage() . "\n");
        return;
    }
    print(__FUNCTION__ . ": OK, please check localfile: 'upload-test-object-name.txt'" . "\n");
}

用户点击另存为需要在Put的时候设置Content-Disposition", "attachment;filename=b.zip"：

设置在options中
/**
     * 上传内存中的内容
     *
     * @param string $bucket bucket名称
     * @param string $object objcet名称
     * @param string $content 上传的内容
     * @param array $options
     * @return null
     */
    public function putObject($bucket, $object, $content, $options = NULL)
    {
        $this->precheckCommon($bucket, $object, $options);
        OssUtil::validateContent($content);
        $options[self::OSS_CONTENT] = $content;
        $options[self::OSS_BUCKET] = $bucket;
        $options[self::OSS_METHOD] = self::OSS_HTTP_PUT;
        $options[self::OSS_OBJECT] = $object;
        if (!isset($options[self::OSS_LENGTH])) {
            $options[self::OSS_CONTENT_LENGTH] = strlen($options[self::OSS_CONTENT]);
        } else {
            $options[self::OSS_CONTENT_LENGTH] = $options[self::OSS_LENGTH];
        }
        if (!isset($options[self::OSS_CONTENT_TYPE])) {
            $options[self::OSS_CONTENT_TYPE] = $this->getMimeType($object);
        }
        $response = $this->auth($options);
        $result = new PutSetDeleteResult($response);
        return $result->getData();
    }