mmm-mode in emacs 22

[Perry Smith]

I am having problems with mmm-mode in emacs 22 running on a Mac.  I'm  
about to dive off and see if I can fix them.  But before I do, I  
wanted to ask this group if there is a more supported method of  
having a buffer with multiple editing submodes mixed into it that has  
been implemented in emacs 22 that emacs 21 did not have.

I also wanted to ask if anyone in this group has a suggestion of how  
would be best to implement such a concept given emacs 22 current design.

The particular problem I have having is around the php submode.  php  
mode is based upon cc-mode.  There are a number of buffer local  
variables that are not being set up.  I am not sure (yet) if they are  
getting set up and then clobbered or if they are just never getting  
set up at all.  The cc-mode elisp from emacs 21 works (or appears to  
work).

Thank you for your time,
Perry Smith