Exporting images, attachments, uploads files' actual content bytes

[vadimkantorov]

It would be good to have a way to actually include all files' content in the XML as CDATA/base64 (or data-uri) - maybe could be very easy as iteration over all files in wp-uploads and serializing them as CDATA. The WXR size might implode, but this can be okay for import/export and there is benefit in keeping the full archive in a single, self-contained archive file. An alternative could be optionally also producing a sidecar ZIP file containing all the images, attachments, uploads etc (and allowing to specify it during wp import). But having a single-file export/import feature is super nice, and would be a simpler format for other blog platforms to support for interop.

This is useful for export/import scenarios, and batch importing content from third-party blogging platforms.

If this is already implemented, it would be nice to have a more clear description of what happens with images' bytes to https://developer.wordpress.org/cli/commands/export/ . And even if this is not implemented, it would be great to have some discussion of how to import/export files actual file bytes for the time being...