将查询传递给PDO时出错

Question

Whenever I pass a query after a PDO connection the page returns an 500 error. I don't know whats causing the issue. I am using LAMP server. Here is the code:

$user = 'root';
$database = 'mysql';
$password = 'root';
$dbname = 'pdotest';
$host = 'localhost';

$dsn = $database . ":" . $host . ";dbname=" . $dbname;

$opt = array(
    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ,
);

$pdo = new PDO($dsn, $user, $password, $opt) or die('Can\'t establish connection');

// This is where it gives 500 error

$stmt = $pdo->query("SELECT * FROM pdo");

Answer 1

Seems like I made a silly mistake. Just missed a host in dsn. Changing dsn from:

$dsn = $database . ":" . $host . ";dbname=" . $dbname;

To:

$dsn = $database . ":host=" . $host . ";dbname=" . $dbname;

solved my problem.