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I am an experienced PHP programmer, but I have been looking into Ruby lately, and it seems there are some neat features that I have been missing out on. I want to use PHP for all my important things, but then throw in a nice dash of Ruby on Rails when it makes things convenient (for, let's say, working with a Cassandra database, something not easily accomplished with PHP.)
Is there any harm in running PHP and Ruby simultaneously on one Apache setup? I would like to use some of the finer features of Rails, but I'm addicting to PHP and cannot give it up.