$host = '127.0.0.1';
$db   = 'test';
$user = 'root';
$pass = '';

$dsn = "mysql:host=$host;dbname=$db";
$options = [
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    PDO::ATTR_EMULATE_PREPARES   => false,
];
try {
     $pdo = new PDO($dsn, $user, $pass, $options);

    $stmt = $pdo->query('SELECT name FROM users');

    while ($row = $stmt->fetch())
    {
        echo $row['name'] . "\n";
    }
} catch (\PDOException $e) {
     throw new \PDOException($e->getMessage(), (int)$e->getCode());
}