extraMetadata example

public function listContents(string $location, bool $deep = self::LIST_SHALLOW): DirectoryListing
    {
        $location = $this->preparePath($location);

        return new DirectoryListing(array_map(
            function DStorageAttributes $info) {
                if ($info instanceof DirectoryAttributes) {
                    return new DirectoryAttributes(
                        $this->stripPath($info->path()),
                        $info->visibility(),
                        $info->lastModified(),
                        $info->extraMetadata()
                    );
                }

                if ($info instanceof FileAttributes) {
                    return new FileAttributes(
                        $this->stripPath($info->path()),
                        $info->fileSize(),
                        $info->visibility(),
                        $info->lastModified(),
                        $info->mimeType(),
                        $info->extraMetadata()
                    );