I don't understand your question but maybe this will help.
PHP Code:
//#CLIENTSIDE
function onCreated() {
temp.dumbarray = {1, 2, 3, 4, 5};
swapElement(temp.dumbarray.link(), 0, 4);
echo(temp.dumbarray[0]); // echos 5
}
function swapElement(temp.arr, a, b) {
temp.old = temp.arr[b];
temp.arr[b] = temp.arr[a];
temp.arr[a] = temp.old;
}