$user_id = 1;
    // connect to database
    $db = mysqli_connect("localhost", "root", "", "comment-reply-system");
    // get post with id 1 from database
    $post_query_result = mysqli_query($db, "SELECT * FROM posts WHERE id=1");
    $post = mysqli_fetch_assoc($post_query_result);

    // Get all comments from database
    $comments_query_result = mysqli_query($db, "SELECT * FROM comments WHERE post_id=" . $post['id'] . " ORDER BY created_at DESC");
    $comments = mysqli_fetch_all($comments_query_result, MYSQ