php mysql get data in array

Hello i want get data in array from the database, i have this code:

$sql = "SELECT * FROM nat WHERE village = '$village'";
$result = $conn->query($sql);


$prname1=array();

while($row = $result->fetch_array()) {
 
    $prname1[]=$row['id_source'];

  }

if call print_r

print_r($prname1);

get back this value:

Array ( [0] => 30000 [1] => 30002 [2] => 30003 )

I need values like this:

[ [0 => 30000], [0 => 30002], [0 => 30003], ]

how to?
Thanks

I try more solutions

>Solution :

Wrap another array around the value when pushing onto the result array.

$prname1[] = [$row['id_source']];