https://www.php.net/manual/tr/pdostatement.fetch.php burayi inceleyin ve veritabani bu sekilde baglamaniz oneriyorum
// Database bilgileri
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// baglanti
$conn = new mysqli($servername, $username, $password, $dbname);
// bağlantıyı test et
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
?>