Turn warnings on: 
"my $a" used in sort comparison at ./1.pl line 7.

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That's why you should never use $a and $b as variable names. sort needs access to the package variable $a (documented at $a).

Update: link to perlvar added.

لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: question about: my $a AND sort {$a <=> $b} keys %hash by choroba
in thread question about: my $a AND sort {$a <=> $b} keys %hash by rsFalse

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