foreach my $key (sort { ... } keys $HoH{0}) { ... }

Note that keys can be passed  $HoH{0} (assuming  @HoH as given in the OP), i.e., passed a hash reference, only with Perl version 5.14+.

In reply to Re: Sorting hash of hashes by values by AnomalousMonk
in thread Sorting hash of hashes by values by winnie_pooh

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