如何使用新的 AWS S3 PHP 开发工具包使用"公共读取"更新 S3 中的项目：似乎只能进行 GET 和 PUT？ http://docs.aws.amazon.com/aws-sdk-php/latest/class-Aws.S3.S3Client.html
迭代器返回一个数组，而不是一个类。 get 对象返回一个类，但没有明显的更新方法。CopyObject似乎有点黑客？
$s3->copyObject(array(
'Bucket' => 'media',
'Key' => $k,
'CopySource' => 'media'.'/'.$k,
'ACL' => 'public-read',
));
返回：
PHP Fatal error: Uncaught Aws'S3'Exception'InvalidRequestException: AWS Error Code: InvalidRequest, Status Code: 400, AWS Request ID: FC630F89A049823A, AWS Error Type: client, AWS Error Message: This copy request is illegal because it is trying to copy an object to itself without changing the object's metadata, storage class, website redirect location or encryption attributes., User-Agent: aws-sdk-php2/2.5.3 Guzzle/3.8.1 curl/7.35.0 PHP/5.5.9-1ubuntu4.4 thrown in /.../vendor/aws/aws-sdk-php/src/Aws/Common/Exception/NamespaceExceptionFactory.php on line 91
迟到总比没有好。
$s3Client->putObjectAcl(array(
'Bucket' => 'yourbucket',
'Key' => 'yourkey',
'ACL' => 'public-read'
));