How to save value of a query string parameter then use it in Phase 4?

Hi,

This might be easy but it's not clear to me how to do this from
reading the reference manual (especially 'setvar' and MATCHED_VAR) and
going through all of the rules files that I have at my disposal.

In Phase 2, I want to save the value of a get query string parameter,
say "menu=700".

So the rule might start off as:
SecRule ARGS_GET:menu ...

and somehow I need to set a variable with the value 700.

Then in Phase 4 I want to access the value and invoke a rule if a
match, otherwise bypass the rule
SecRule  ???  "!@eq 700" "t:none,pass,skip:2"
SecRule RESPONSE_BODY "..."  "phase:4:..."

How can I do this?

Any help is appreciated.
Stephen

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