Question

array(2) {
  [0]=>
  object(stdClass)#144 (2) {
    ["id"]=>
    string(1) "2"
    ["name"]=>
    string(5) "name1"
  }
  [1]=>
  object(stdClass)#145 (2) {
    ["id"]=>
    string(1) "4"
    ["name"]=>
    string(5) "name2"
  }
}

I want to add key and value (for example [distance] = 100;) to the objects in the array. After this I want to sort on the distance values. How can I achieve this?

Answer 1

To get structure such as yours you can do:

$arr = array();
$arr[0]->id = "2";
$arr[0]->name = "name1";
$arr[1]->id = "4";
$arr[1]->name = "name2";

To add “distance” you can do:

$arr[0]->distance = 100;
$arr[1]->distance = 200;

To sort you can use decorate/sort/undecorate pattern:

$arr = array_map(create_function('$o', 'return array($o->distance, $o);'), $arr); // transform array of objects into array of arrays consisted of sort key and object
sort($arr); // sort array of arrays
$arr = array_map('end', $arr); // take only last element from each array

Or you can use usort() with custom comparison function like this:

function compareDistanceFields($a, $b) {
  return $a->distance - $b->distance;
}
usort($arr, "compareDistanceFields");