How to interrupt a PHP DELETE with a confirm

The following code starts deleting entries after a user presses the Delete button:

if (isset($_POST['action']) and $_POST['action'] == 'Delete')
        $sql = 'SELECT id FROM joke WHERE authorid = :id';
        $s = $pdo->prepare($sql);
        $s->bindValue(':id', $_POST['id']);
        $s->execute(); // -> means to call a method (a function stored in an object)
    catch (PDOException $e) 
        $error = 'Error getting list of jokes to delete.';
        include 'error.html.php';

How do I insert a way to momentarily prevent this code from executing to show a warning notice with an option to cancel, but continue the code if they choose that option? I’m confused because I can do it with JavaScript and HTML, but not this way.

It seems to me that I would insert a JavaScript function so that when the Delete button is clicked, a Confirm popop is seen. In the confirmation button, <?php code is inserted for the deletion page ?> So the deletion is not delayed, but started after the confirm. But then somehow the form contents has to carry through the JavaScript to the next page.

You could post the values of the first form to hidden fields in a new Confirm form then delete when that form is posted.

Thank you!