Thanks for the quick reply! I was especially thinking about cases where not the name, but whole parameters were added or removed, which happens frequently in early development changes. In this case the PHPDoc is outdated and must be rewritten manually, while it should be possible to auto-update or fully re-generate (simple first step)
The refactoring is fine and great already.
I know this is not an easy task, but it will help a lot in coding! Hopefully I was now able to explain the key idea?