my %hash = (doc1 => 2345, doc2 => 1234, 
            doc3 => 5678, doc4 => 4567);

##</code><code>##

my @keys = sort {$hash{$a} <=> $hash{$b} }(keys %hash);

##</code><code>##

 my @array = (["doc1", 2345], ["doc2", 1234], 
              ["doc3", 5678], ["doc4", 4567]);