PHP array merging [on hold]

Hope this will help you :

Working demo : https://eval.in/1014350

$array = array(array(
     'id' => 1,
     'order_id' => 1,
     'image_url' => '/resources/filename1'
     ),array(
     'id' => 2,
     'order_id' => 1,
     'image_url' => '/resources/filename2'
     )
);
foreach ($array as $key => $item) {
  if ($item['id'] == 1)
  {
    $data['id'] = $item['id'];
  }
  $data['order_id'] = $item['order_id'];
  $data['image_url'][$key] = $item['image_url'];
}
print_r($data);

Program Output

Array
(
    [id] => 1
    [order_id] => 1
    [image_url] => Array
        (
            [0] => /resources/filename1
            [1] => /resources/filename2
        )
)

Ok, I am sorry my previous answer was not right, this one does, I assume a couple of things:

• Your input can be more than two rows and can have more than one order ID
• I am assigning to ID the first ID with that order ID (if not you can just only assign the ID key.

Here is the code:

$arrays = [
    [
        "id" => 1,
        "order_id" => 1,
        "image_url" => "/resources/filename1"
    ],
    [
        "id" => 2,
        "order_id" => 1,
        "image_url" => "/resources/filename2"
    ],
    [
        "id" => 3,
        "order_id" => 1,
        "image_url" => "/resources/filename3"
    ],
        [
        "id" => 4,
        "order_id" => 2,
        "image_url" => "/resources/filename4"
    ],
];
foreach($arrays as $array) {
    if(!isset($result[$array['order_id']]['id'])) {
        $result[$array['order_id']]['id']=$array['id'];
    }
    $result[$array['order_id']]['order_id']=$array['order_id'];
    $result[$array['order_id']]['image_url'][]=$array['image_url'];
}
print_r($result);

Tested here.