First,
@$foo is an arrayref, not a hashref. You can make it seem like a hashref by the
@{$foo} thingies.
Second, just do this.
my @bar = sort{@{$foo->{$a}} cmp @{$foo->{$b}}} @$foo;
I might be wrong on this because I am not too familiar in the area, please point it out to me if I am. Thank you.
UPDATE:jeffa has pointed out to me how I could fix this...
my @bar = sort{$foo->{$a} cmp $foo->{$b}} @$foo;
$_.=($=+(6<<1));print(chr(my$a=$_));$^H=$_+$_;$_=$^H;
print chr($_-39); # Easy but its ok.
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