PHP: descending asort doesn't work?

I have this website using arrays and then I have this function which sorts these arrays using asort. It looks like this:

function aasort (&$array, $key) {
    $sorter=array();
    $ret=array();
    reset($array);
    foreach ($array as $ii => $va) {
        $sorter[$ii]=$va[$key];
    }
    asort($sorter);
    foreach ($sorter as $ii => $va) {
        $ret[$ii]=$array[$ii];
    }
    $array=$ret;
}

This algorithm sorts the array from 1-10 but I'll need it to sort descending, from 10-1. I have tried using rsort with no luck, and I have tried array_reverse too without luck. I don't know if I have used them wrong? Or.. Well at least I just need the algorithm to sort them descending. Any idea, advice or suggestions are appreciated. Thanks!

Try usort with defined ordering function as the documentation says.
http://www.php.net/manual/en/function.usort.php

function sortSomething($a, $b){
    if ($a < $b){
        return -1;
    }
    else if ($a > $b){
        return 1;
    }
    else{
        return 0;
    }
};
// Now sort the array using the comparison function
usort($array, 'sortSomething');

This sorts elements in a normal way - just switch the comparison operators and you'll get reverse sorting.