>  so when
> you're using $_SERVER variables there's no call back to the server, as the
> code is still being run on the server at that point.

This is something I actually do understand.  I was wondering if the
code running on the server had to query the server for the information
every time a $_SERVER var was referenced, but like Daniel explained,
the contents of the $_SERVER array are populated at runtime and so no
further "hey server, what version of apache are you running?"
questions need to be asked of it.


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