use Aws\S3\S3Client;
use League\Flysystem\AwsS3v3\AwsS3Adapter;
use League\Flysystem\Filesystem;
use S3Metadata\AwsS3MetadataPlugin;

$s3Client = new S3Client(['version' => '2006-03-01', 'region' => 'eu-central-1']);
$filesystem = new Filesystem(new AwsS3Adapter($s3Client));
$filesystem->addPlugin(new AwsS3MetadataPlugin());

$metaData = $filesystem->getAwsMetaData('key/to/object');

如果插件添加到了S3之外的另一个文件系统，则 getAwsMetaData 函数将简单地返回一个空数组。