Error adding to database?

Question

PHP

Do not enter any text with an error, it is simply not added to the database

$dsn = 'mysql:host=localhost;dbname=prpr';
$pdo = new PDO($dsn , 'root', '');
  $title = $_POST['title'];
  $txt = $_POST['txt'];
  $sel = $_POST['sel'];
  $sql = "INSERT INTO forum(title,txt,sel) VALUES(:title,:txt,:sel)";
  $query = $pdo->prepare($sql);
  $query->execute(['title' => $title, 'txt' => $txt, 'sel' => $sel]);