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

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

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