AWS PHP SDK不会自动重试分块上传，但可以通过编写代码来实现重试逻辑。下面是一个示例代码，演示如何自动重试分块上传：

 'us-west-2',
    'version' => 'latest',
    'credentials' => [
        'key' => 'YOUR_AWS_ACCESS_KEY',
        'secret' => 'YOUR_AWS_SECRET_ACCESS_KEY',
    ],
]);

// 文件路径
$filePath = 'path/to/file';

// 存储桶名称
$bucketName = 'your-bucket';

// 对象键
$key = 'your-object-key';

// 分块上传参数
$uploadParams = [
    'Bucket' => $bucketName,
    'Key' => $key,
    'SourceFile' => $filePath,
];

try {
    // 开始分块上传
    $initiateResult = $s3Client->createMultipartUpload($uploadParams);
    $uploadId = $initiateResult['UploadId'];

    // 打开文件进行分块上传
    $file = fopen($filePath, 'r');
    $partNumber = 1;
    $parts = [];

    while (!feof($file)) {
        // 读取文件块
        $chunk = fread($file, 5 * 1024 * 1024); // 每块5MB

        // 上传文件块
        $uploadPartParams = [
            'Bucket' => $bucketName,
            'Key' => $key,
            'UploadId' => $uploadId,
            'PartNumber' => $partNumber,
            'Body' => $chunk,
        ];

        $retryCount = 0;
        $maxRetries = 3;
        $isUploadSuccess = false;

        while (!$isUploadSuccess && $retryCount < $maxRetries) {
            try {
                $result = $s3Client->uploadPart($uploadPartParams);
                $parts[] = [
                    'PartNumber' => $partNumber,
                    'ETag' => $result['ETag'],
                ];
                $isUploadSuccess = true;
            } catch (AwsException $e) {
                $retryCount++;
                sleep(2); // 等待2秒后重试
            }
        }

        if (!$isUploadSuccess) {
            // 重试失败，抛出异常或执行其他操作
            throw new Exception('Failed to upload part');
        }

        $partNumber++;
    }

    // 完成分块上传
    $completeParams = [
        'Bucket' => $bucketName,
        'Key' => $key,
        'UploadId' => $uploadId,
        'MultipartUpload' => [
            'Parts' => $parts,
        ],
    ];
    $s3Client->completeMultipartUpload($completeParams);

    echo 'File uploaded successfully';

} catch (Exception $e) {
    echo 'Error: ' . $e->getMessage();
}

在上面的示例代码中，使用uploadPart方法上传每个文件块，并在失败时进行重试。重试次数和等待时间间隔可以根据需求进行调整。完成所有文件块上传后，调用completeMultipartUpload方法完成分块上传过程。

请注意，上述代码仅是一个示例，你可以根据自己的需求进行修改和调整。