Ok. First off, I'd like to congratulate you for using warnings (or -w, as you may know it).

Secondly, you don't have a syntax or run-time error, you have a warning. What htat means is that some variable you're attempting to use in "" is set to undef, not '' as you might think.

Doing a my $varname; just allocates the name ... it doesn't initialize it to a defined value. So, if nothing was assigned to $category (for instance), then that's what would cause your warning.

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