arrow_back How to combine arrays with the same keys?

Question

I have two arrays of products that have the same articles, but a different quantity, and different cities.
But there are products that do not repeat themselves.

Array

$arr1 = array(
    [0] => Array
        (
            [article] =>  А6-01-05
            [name] => Example
            [price] => 9 700
            [quantity] => 3
            [brand] => Oktan
            [code] => УТ-00024246
            [city] => Nur-Sultan
        )
      )
$arr2 = array(
    [0] => Array
        (
            [article] =>  А6-01-05
            [name] => Example
            [price] => 9 700
            [quantity] => 5
            [brand] => Oktan
            [code] => УТ-00024246
            [city] => Almaty
        )
      )

I need something like

$arr = array(
    [0] => Array
        (
            [article] =>  А6-01-05
            [name] => Example
            [price] => 9 700
            [quantity] => 
                         [0] => 3
                         [1] => 5
            [brand] => Oktan
            [code] => УТ-00024246
            [city] => 
                         [0] => Nur-Sultan
                         [1] => Almaty
        )
      )

and the goods that do not repeat were also in a new array as usual.

Comments

round

Answer 1

function merge($idKey, $mergeKeys, ...$data) {
  $merged = [];

  foreach (array_merge(...$data) as $item) {
    $id = $item[$idKey];

    if (!array_key_exists($id, $merged)) {
      $merged[$id] = [
        'unique' => true,
        'item' => $item,
      ];
    } else {
      if ($merged[$id]['unique']) {
        $merged[$id]['unique'] = false;
        foreach ($mergeKeys as $k) {
          $merged[$id]['item'][$k] = [ $merged[$id]['item'][$k] ];
        }
      }

      foreach ($mergeKeys as $k) {
        $merged[$id]['item'][$k][] = $item[$k];
      }
    }
  }

  return array_column($merged, 'item');
}


$merged = merge('code', [ 'quantity', 'city' ], $arr1, $arr2);