$hash{$id} = [1,2,3]; # [ ... ] creates an anonymous array ref
@temp = (1,2,3);
$hash{$id} = \@temp; # \ makes an explicit reference to @temp

##</code><code>##

$x = ${$hash{$id}}[0];
# or
$x = $hash{$id}[0];
# or
$x = $hash{$id}->[0];

##</code><code>##

my @values = @{$hash{$id}};