I have not got this working yet :/
If I do Ctrl+Shift+B on a .php file, it says: Error…”php” isn’t supported yet.
If I check the ‘format on save’, it saves the file with the Ctrl+Shift+B shortcut but doesn’t format it and does not show an error.
I noticed your blog post quotes:
whereas your screenshot shows:
Notice double hyphen at the start. I thought that was the difference but it does not help.
Could there be any additional steps that I may need?