Is anyone aware if such a debugging/documentation tool exists?

What is/do I mean by a "cross referencer"?
A tool which will list all of the variables (and function names ?and include files) 
used within a
program/script, together with the line number(s) where they are mentioned - hopefully 
differentiating where the
value is referenced from where it is updated, etc. Such is handy for debugging, 
picking up upper/lower case
naming inconsistencies, etc.

Please advise,

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