//因?yàn)檫B接SQLite數(shù)據(jù)庫(kù)不需要用戶名和密碼，所以，DSN 中僅指定了驅(qū)動(dòng)和數(shù)據(jù)源位置（文件路徑）
$db = new PDO('sqlite:/path/to/database.sq3');
//MySQL 連接
$db = new PDO('mysql:host=hostname;dbname=databasename;charset=utf8', 'username', 'password');
//PostgreSQL 連接
$db = new PDO('pgsql:host=hostname;port=portnumber;dbname=databasename;user=username;password=password');

$dsn = 'mysql:host=localhost;dbname=test';
$username = 'testuser';
$password = 'testpass';
try {
$dbh = new PDO($dsn, $username, $password);
echo "連接成功\n";
} catch (PDOException $e) {
echo "連接失敗：" . $e->getMessage() . "\n";
}