dumb php question

#1
I have a client that is interested in running php6. My account is currently using php4.1. I have other clients that do thier own php coding that use 4.1.

Now here is the dumb question.

Can php be upgraded by just certain domains instead of for all my clients?
 
#2
Only if they run it as a CGI module. cPanel will automatically configure itself to run 4 and 5 concurrently if you ask it to, but 6 is nowhere near the radar at the moment.
 
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