Exstatica,
I also use php for my scripted pages. SSIs dont get parsed in php scripts, but if you are running Apache you can use the 'virtual()' php command to sub-request an SSI.
Create a file (slashubb.shtml) that contains only the slashubb ssi script. In the php script where you want slashubb to appear, call the shtml with the virtual() command {}
Make sue that you do have .shtml as server parsed files in the Apache conf.
I am also in the process of converting the slashubb script to a pure php script and once I am done I will try to remember to post it here.
