Quadrille - 10:37 am on Mar 7, 2012 (gmt 0)
I don't see a need to update Google snippet code everytime it chnages - but then, I never, ever worried about 100% validation, that way madness lies.
Google is changing all the time, and code updates reflects this; kudos to them that old code still works!
But if you are a code zealot (and nothing wrong with that, as Seinfeld would say), then you really need to study Server Side Includes - either php or not.
It's really simple stuff - but life changing for we who code pages one-by-one.