@rry isn't declared in case 1 because you didn't export anything (@EXPORT = ();).
Case 2 prints zero since you never assign anything to the array named rray in the MyModule namespace. my creates a lexical variable (i.e. one that's only seen in the lexical scope where it's declared), not a package variable (i.e. one that's located in a package and visible everywhere).
Just like your script can't see the lexical variable since it's out of scope, Exporter can't see it either. As such, Exporter exports package variables. Case 3 is therefore exports the same variable that you accessed in case 2, a package variable to which you never assigned anything.
Solutions:
- @MyModule::rray = (1, 2, 3, 4) instead of my @rray = (1, 2, 3, 4);.
- use vars qw( @rray ); @rray = (1, 2, 3, 4) instead of my @rray = (1, 2, 3, 4);.
- our @rray = (1, 2, 3, 4) instead of my @rray = (1, 2, 3, 4);.
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