I want to compute the sum of all possible sub-set form array.

```
$array= Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 6 ); //changing
function powerSet($array) {
// add the empty set
$results = array(array());
foreach ($array as $element) {
foreach ($results as $combination) {
$results[] = array_merge(array($element), $combination);
$total= array_sum($results); // I try this
}
echo $total; // I try this
}
return $results;
}
```

The above code is used to find subsets. I found this code from here. I just add `array_sum`

but show 0's how to find each subset total? any way ?