Here's something that works:
    $xavp(x=>a) = "1";
    $xavp(x[0]=>b) = "2";
    $xavp(x=>a) = "10";
    $xavp(x[0]=>b) = "20";
    $xavp(x=>a) = "100";
    $xavp(x[0]=>b) = "200";


    $var(i) = 0;
    while (pv_isset("$xavp(x[$var(i)])")) {
        xlog("L_INFO", "[$mi] xavp_copy $var(i)\n");
        xavp_copy("x", "$var(i)", "y");
        $var(i) = $var(i) + 1;
    }
    xlog("L_INFO", "[$mi] x is duplicated to y\n");

    $var(i) = 0;
    while (pv_isset("$xavp(y[0])")) {
        xavp_params_implode("y", "$var(out)");
        xlog("L_INFO", "[$mi] xavp(y[$var(i)])=$var(out)\n");
        pv_unset("$xavp(y[0)");
        $var(i) = $var(i) + 1;
    }


The output:
Jan 21 10:18:12 asrock k[29060]: INFO: <script>: [1258] xavp_copy 0
Jan 21 10:18:12 asrock k[29060]: INFO: <script>: [1258] xavp_copy 1
Jan 21 10:18:12 asrock k[29060]: INFO: <script>: [1258] xavp_copy 2
Jan 21 10:18:12 asrock k[29060]: INFO: <script>: [1258] x is duplicated to y
Jan 21 10:18:12 asrock k[29060]: INFO: <script>: [1258] xavp(y[0])=b=200;a=100;
Jan 21 10:18:12 asrock k[29060]: INFO: <script>: [1258] xavp(y[1])=b=20;a=10;
Jan 21 10:18:12 asrock k[29060]: INFO: <script>: [1258] xavp(y[2])=b=2;a=1;

-ovidiu

On Tue, Jan 21, 2020 at 12:54 AM Julien Chavanton <jchavanton@gmail.com> wrote:
>
> This code as it is is useless, unless we print the content or do something before making the copy but can provide a way to to duplicate/reorder stacks.
>
> Maybe looping over
>
>   if (defined $xavp(x[$var(i)]))
>
> Is sufficient, no need to pv_unset
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