将其转换为 PDO

/* connect */
$dsn = "mysql:host=localhost;db=test;charset=utf8";
$opt = array(
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
);
$pdo = new PDO($dsn,"user", "passw", $opt);


/* insert */
$query = "INSERT INTO personal (LastName, FirstName) VALUES  (?, ?)";
$stmt  = $pdo->prepare($query);
$stmt->execute(array($_POST['lastName'],$_POST['firstName']));

$query = "INSERT INTO exam (Level, Centre, BackupCentre, etc) VALUES (?, ?, ?, 'etc')";
$stmt  = $pdo->prepare($query);
$stmt->execute(array($_POST['level'], $centre, $backup));