I wonder if a question like this one is on topic, at programmers.stackexchange.com. (If not, do you know some other StackExchange site where I could ask?)
The question is something like this:
"To which PHP frameworks would you port a better discussion system?
I suppose that popular and growing/non-declining frameworks would be appropriate. However I don't know much about the PHP world.
The discussion system would manage the comments following a blog post, or forum thread.
(I've ported to one PHP framework already.)"
"What kind of questions can I ask here?" — "[...] business concerns [...]"