$db = new \PDO('mysql:dbname=db;host=localhost;charset=utf8mb4', 'root', '');
$stmt = $db->prepare("SELECT * FROM table");
$stmt->execute();
while($row=$stmt->fetch())
{
 echo "<tr>
<td>$row['ogrenci']</td>
<td>$row['ders1']</td>
....
 </tr>";
}