Question

For example, if these were my arrays:

array (4) {
  [0] => 6,
  [1] => 7,
  [2] => 8,
  [3] => 9
}

And:

array (4) {
  [0] => 10,
  [1] => 1,
  [2] => 3,
  [3] => 5
}

And this array, which I want to sort:

array (4) {
  [0] => 'foo1',
  [1] => 'foo2',
  [2] => 'foo3',
  [3] => 'foo4'
}

I would get this for the final result (after sorting):

array (4) {
  [0] => 'foo1',
  [1] => 'foo4',
  [2] => 'foo3',
  [3] => 'foo2'
}

Is this possible? Note that I got this final array by sorting the 3rd array provided by the sums of the same keys of the first two arrays.

Any help?

Answer 1

$arr1 = array(6,7,8,9);
$arr2 = array(10,1,3,5);
$arr3 = array('foo1','foo2','foo3','foo4');
$arr = array();

foreach($arr1 as $key => $item){
    $arr[] = $arr1[$key]  + $arr2[$key];
}
arsort($arr);

$res = array();
foreach($arr as $key => $value){
    $res[] = $arr3[$key];
}

print_r($res);