用 PHP 如何查询 MySQL 数据库？

$dbDatas = parse_ini_file(DB_FILE);
$dbOptions = [
    \PDO::ATTR_DEFAULT_FECTH_MODE => \PDO::FETCH_OBJ,
    \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION
];

$dsn = sprintf(
    'mysql:dbname=%s;host=%s',
    $dbDatas['dbname'],
    $dbDatas['host']
);

$this->cn = new \PDO($dsn, $dbDatas['user'], $dbDatas['password'],
$dbOptions);
$this->cn->exec('SET CHARACTER SET UTF8');

$sql = "SELECT * FROM table_name";

$stmt = $pdo->prepare($sql) ;
$stmt->execute();

 $row = $stmt->fetchAll();