$stmt = $conn->query("SELECT * FROM notifications LIMIT 0 ; SHOW META ;");
$stmt->nextRowset();
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);
print_r($result);

foreach ($result as $element => $value) {
    echo "element $element, value $value \n";

//  if ($result['Variable_name'] == 'total_found') {
//      $total_found = $result['Value'];
//  }
}