如何在PHP中更改对象中JSON数组的输出？

Question

I have an issue regarding the API JSON output. I am getting stuck into JSON output when in a loop, it is making its own index when i am forcing the array format to change into the index array.

PHP Code:

$sql = "SELECT name,fname,address FROM user_management";
$array = array();

$result = $conn->query($sql);
$i=1;

if ($result->num_rows > 0) {
    // output data of each row
    $array=["message"=>"success"];
    while($row = $result->fetch_assoc()) {

    $array[] = ["Hello" => $row];

 } 

} 
else 
{
    echo "0 results";
}
 //echo implode(',', $array);
 // Take output array glue it with the
echo json_encode($array);
$conn->close();
?>

I am getting the response as:

{
  "message": "success",
  "0": {
    "Hello": {
      "name": "harjot",
      "fname": "tejinder",
      "address": "noida"
    }
  },
  "1": {
    "Hello": {
      "name": "regret",
      "fname": "egegrregeger",
      "address": "gegreg"
    }
  },
  "2": {
    "Hello": {
      "name": "harjot1",
      "fname": "harjot2",
      "address": "noida"
    }
  },
  "3": {
    "Hello": {
      "name": "har",
      "fname": "har1",
      "address": "Punjab"
    }
  }
}

I want the response as without the 0,1,2,3 that array is making on its own.Is there a way to access the index of an arrays?

Expected output:

{   "message": "success",
    "Hello": {
      "name": "harjot",
      "fname": "tejinder",
      "address": "noida"   },
    "Hello1": {
      "name": "regret",
      "fname": "egegrregeger",
      "address": "gegreg"   },
    "Hello2": {
      "name": "harjot1",
      "fname": "harjot2",
      "address": "noida"   },
    "Hello3": {
      "name": "har",
      "fname": "har1",
      "address": "Punjab"
    }   
}