Of course it's more fun to do it yourself. Try this:

my @ary = (1, ['a', 'b', [], [3, [0], 5]]);

print_deep_array(\@ary);
print "\n";

sub print_deep_array($)
{
    my $arrRef = shift;
    for (my $i = 0; $i < scalar(@$arrRef); ++$i) {
        if (ref($arrRef->[$i]) eq 'ARRAY') {
            print ', ' if ($i);
            print '[';
            print_deep_array($arrRef->[$i]);
            print ']';
        } else {
            print ', ' if ($i);
            print $arrRef->[$i];
        }
    }
    print ' ' if (!scalar(@$arrRef));
}
[download]