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.
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