Error Menampilkan Data dari database dengan koneksi pdo

Selamat Siang gan ane lagi belajar php.. koneksi database sudah berhasil tapi ane dapet error pas mau nampilin data. tolong dibantu :)

Fatal error: Uncaught PDOException: SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected in C:\xampp\htdocs\portalberita\index.php:56 Stack trace: #0 C:\xampp\htdocs\portalberita\index.php(56): PDO->query('SELECT *FROM is...') #1 {main} thrown in C:\xampp\htdocs\portalberita\index.php on line 56

koneksi.php

<?php
//variabel
$server="localhost";
$user="root";
$password="";
$nmdatabase="newspaper";
//variabel koneksi

try {
  $conn=new PDO ("mysql:host=$server;nmdatabase=$nmdatabase", $user, $password);
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  //echo "Berhasil Konek Database!!!";
} catch (PDException $e) {
  echo 'Error : '.$e->getMessage();
}

?>

index.php

<?php
 include 'koneksi.php';

$result = $conn->query('SELECT * FROM isiberita');
//die(var_dump($result->fetch()));

while ($row = $result->fetch()) {
     echo $row['judul'] . '<br>';
}
?>