That depends on ones definition of 'best'. One could also write: 
sub copy_hash {
    my $hr = shift // return {};
    my $copy;
    @$copy{keys %$hr} = value %$hr;
    $copy;
}

[download]
or just: 
sub copy_hash {{%{$_[0]//{}}}}

[download]
Or without a sub: 
my %copy = %+;

[download]

In reply to Re^3: %+ and cloning by JavaFan
in thread %+ and cloning by PetaMem

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