（PHP）阿里云OSS断点续传，上传失败

[font='Helvetica Neue', Helvetica, Arial, sans-serif]第一步的initiateMultipartUpload是可以正常运行的，也得到了uploadID。
[font='Helvetica Neue', Helvetica, Arial, sans-serif]但是第二步分片上传时，一运行就显示
[font='Helvetica Neue', Helvetica, Arial, sans-serif]The specified upload does not exist. The upload ID may be invalid, or the upload may have been aborted or completed
上传请求如下
$oss->uploadPart(array(
'Bucket' => Param::get('OSS_BUCKET'),
'Key' => $key
'Content' => '123456789',
'UploadId' => $init_ans->getUploadId(),
'PartNumber' => 1,
'PartSize' => 9,
));
@各位大神@各位大神@各位大神@各位大神@各位大神@各位大神