State of formatting php with html?

I was just looking for the current status regarding:

```
... Formatting of files that contain mixed PHP and HTML is still considered unstable - please 
see open issues with the tag inline for details.

If you want to use the plugin in production, we recommend limiting its scope to pure PHP files.
```

It looks like some progress has been made but wondering how far a long it is/isn't?

Thanks
Mike