php设置s3内容 - 配置作为附件

I want to set the content-disposition as attachment in a s3 bucket while

uploading file to S3 bucket ,below is my code im using.

$s3 = new S3(AWS_KEY, AWS_SECRET_KEY);

 if ($s3->putObjectFile("$uploadDir/$file", AWS_BUCKET, "$targetDir/$file", S3::ACL_PUBLIC_READ)) {
$syncSize = $s3->getObjectInfo(AWS_BUCKET, "$targetDir/$file");

}

Add contentDisposition in putobject in php as **'ContentDisposition' => 'attachment',**
<pre>
$result = $client->putObject(array(
'Bucket'     => $bucket,
'Key'        => $fileName,
'SourceFile' => $fileTempName,
'ContentDisposition' => 'attachment',
'Metadata'   => array(
   'Foo' => 'abc',
 'Baz' => '123'
    )
 ));
</pre>