"I know that's not an ARRAY ref, but since I want to learn the appear order"
Hashes in Perl aren't ordered. As soon as you put things in a hash, whatever order the keys and values were listed in has already gone.
The workaround you describe is the best option. Passing a tied hash which maintains order is also a possibility, but results in more work for your caller, and slower performance.
Are you posting in the right place? Check out Where do I post X? to know for sure.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.