Not going well for php so far. I see issues with how to edit and save a file with extra formatting so it looks like that problem still exists,just need to see if some of the save formats work better. I believe fp2003 has some features that may be better suited for php but has some very limited WYSIWYG features for php.
We will see.
BTW I don't use the subscription feature at all so I don't know about a alternative to your situation. But I know Basil uses it.