How to add data to database from select?

Question

PHP

I have two inputs from which I add data to the database in this way

Add form

<form action="" method="post">
          <div class="form-group">
            <small>Title</small>
            <input type="text" class="form-control" name="name" value="" placeholder="Name">
          </div>
          <div class="form-group">
            <small>Url</small>
            <input type="text" class="form-control" name="url" value="" placeholder="Url">
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
            <button type="submit" name="add" class="btn btn-primary">Save</button>
          </div>
        </form>

Adding to the database

$title = $_POST['name'];
$url = $_POST['url'];
$get_id_type = $_GET['id'];

if (isset($_POST['add'])) {
  $sql = ("INSERT INTO `xf_type` (`title`, `url`) VALUES (?,?)");
  $query1 = $pdo->prepare($sql);
  $query1->execute([$title, $url]);
  if($query1){
    header("Location: ". $_SERVER['HTTP_REFERER']);
  }
}

But besides the form, I also need data to be added from two selectors.
An example of my form with selectors

<form action="" method="post">
          <div class="form-group">
          <small>MicroWallets Name</small>
            <select class="form-select" aria-label="Default select example">
              <option selected>MicroWallets</option>
              <?php foreach ($type as $value) { ?>
              <option value="<?=$value->id ?>"><?=$value->title ?></option>
              <?php } ?>
            </select>
          </div>
          <div class="form-group">
          <small>Category Name</small>
            <select class="form-select" aria-label="Default select example">
              <option selected>Category</option>
              <?php foreach ($category as $value) { ?>
              <option value="<?=$value->id ?>"><?=$value->title ?></option>
              <?php } ?>
            </select>
          </div>
          <div class="form-group">
            <small>Title</small>
            <input type="text" class="form-control" name="title">
          </div>
          <div class="form-group">
            <small>Url</small>
            <input type="text" class="form-control" name="url">
          </div>
          <div class="form-group">
            <small>Time</small>
            <input type="text" class="form-control" name="time">
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
            <button type="submit" class="btn btn-primary" name="add">Save</button>
          </div>
        </form>

Answer 1

<select class="form-select"  name="select_1"
<select class="form-select"  name="select_2"

$title = $_POST['name'];
$url = $_POST['url'];
$get_id_type = $_GET['id'];
$select_1 = $_POST['select_1'];
$select_2 = $_POST['select_2'];

 $sql = ("INSERT INTO `xf_type` (`title`, `url`,`select_1`, `select_2`) VALUES (?,?,?,?)");