Help Center/ OBS PHP SDK/ API Reference/ Objects-Related APIs/ PUT Part
Updated on 2025-12-22 GMT+08:00
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PUT Part

API Description

After a multipart upload is initialized, you can use this API to upload a part to a specified bucket by using the multipart upload ID. Except for the part last uploaded whose size ranges from 0 to 5 GB, sizes of the other parts range from 100 KB to 5 GB. The upload part ID ranges from 1 to 10000.

Method Definition

1. ObsClient->uploadPart(array $parameter)
2. ObsClient->uploadPartAsync(array $parameter, callable $callback)

Request Parameter

Field

Type

Optional or Mandatory

Description

Bucket

string

Mandatory

Bucket name

Key

string

Mandatory

Object name

PartNumber

integer

Mandatory

Part number, which ranges from 1 to 10000

UploadId

string

Mandatory

Multipart upload ID

ContentMD5

string

Optional

Base64-encoded MD5 value of the part to be uploaded. It is provided for the OBS server to verify data integrity.

Body

string

or

resource

or

GuzzleHttp\Psr7\StreamInterface

Optional

Part content to be uploaded

SourceFile

string

Optional

Path to the source file of the part

Offset

integer

Optional

Start offset (in bytes) of a part in the source file. The default value is 0.

PartSize

integer

Optional

Size (in bytes) of a part in the source file. The default value is the file size minus Offset. Except for the part last uploaded whose size ranges from 0 to 5 GB, sizes of the other parts range from 100 KB to 5 GB.

SseC

string

Optional

Algorithm used in SSE-C encryption. The value can be AES256.

SseCKey

string

Optional

Custom key used in SSE-C encryption. The value is a Base64-encoded 256-bit key.
  • Body and SourceFile cannot be used together.
  • If both Body and SourceFile are null, the size of the object to be uploaded is 0 bytes.
  • Offset, PartSize, and SourceFile are used together to specify a part of the source file to be uploaded.

Returned Result

Field

Type

Description

HttpStatusCode

integer

HTTP status code

Reason

string

Reason description

RequestId

string

Request ID returned by the OBS server

ETag

string

ETag of the uploaded part

SseKms

string

Algorithm used in SSE-KMS encryption

SseKmsKey

string

ID of the KMS master key used in SSE-KMS encryption. If this parameter is left blank, the default key is used. To obtain the key ID, see Viewing a Key.

SseC

string

Algorithm used in SSE-C encryption

SseCKeyMd5

string

MD5 value of the key used in SSE-C encryption

Sample Code

try {
       $resp = $obsClient->uploadPart( [ 
              'Bucket' => 'bucketname',
              'Key' => 'objectkey',
              'UploadId' => 'uploadid',
              'PartNumber' => 1,
              'Body' => 'Hello OBS'
       ] );
       printf ( "RequestId:%s\n", $resp ['RequestId'] );
       printf ( "ETag:%s\n", $resp ['ETag'] );
} catch ( Obs\Common\ObsException $obsException ) {
       printf ( "ExceptionCode:%s\n", $obsException->getExceptionCode () );
       printf ( "ExceptionMessage:%s\n", $obsException->getExceptionMessage () );
}
Parent topic: Objects-Related APIs