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);

}

?>