Datatable Not Doesnt Display Ajax Data Correct

I am using DataTables and want to use Ajax to load my data. But I get this error when I load the page: DataTables warning: table id=example - Requested unknown parameter 'DocentID'

Solution 1:

Try removing the first json_encode(). There's no need to encode it twice.

include_once('DB_Handler.php');

$result = mysqli_query($mysqli, "SELECT DocentID FROM gebruiker");

$rows = array();
while ( $row = mysqli_fetch_array($result))
{
    $rows[] = $row;
}

echo json_encode($rows);