The RHS of

                    my @hashval = $res{$key}{$user}{$user1};

doesn't look much like an array to me. Perhaps this is (one place) where you are going wrong? It is however rather hard to tell given the overall poor shape which this code is in. If you tidy it up you might be better situated to do some debugging.

• Run it through perltidy - the inconsistent indenting is just asking for trouble.
• Lose the switch and case statements and replace them with something better supported.
• Choose meaningful variable names: @hashval says very little about its purpose.
• Use comments to explain what is going on and why.
• Use strict.

Once you've done that and have posted some sample code which compiles (the OP sample does not) we stand a better chance of helping you.

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