sub get_ids {
    my %hash;
    @hash{@{shift()}} = undef;
    print "key:$_\n" for keys %hash;
    return \%hash;
}

# Call it this way
my $hashref = get_ids( [qw/id_one id_two id_three/] );


##</code><code>##

key:id_one
key:id_three
key:id_two