Want to be able to reply to the comments1

Hi, i want be able to reply to the comments.

<?php

session_start();

require_once 'db_conn.php';

if(!isset($_SESSION['user'])){

header("location: login.php?ejlogin");

exit;

}else{

$username = $_SESSION['user'];

}

?>

<!DOCTYPE html>

<html lang="en">

<head>

<meta charset="UTF-8">

<meta http-equiv="X-UA-Compatible" content="IE=edge">

<meta name="viewport" content="width=device-width, initial-scale=1.0">

<title>Welcome</title>

<link rel="stylesheet" type="text/css" href="welcome.css">

</head>

<body>

<main>

    <section class='userInput'>

        <section class="loginInfo">

            <p>Du är inloggad som: <strong><?php echo $username ?></strong></p>

            <div>

                <button><a href="login.php?logout">Logga ut</a></button><br><br>

            </div>

        </section>

       

        <section class="messageArea">

            <form action="" method="post">

                <label for="comment">Meddelande:</label><br>

                <textarea name="comment" id="" cols="30" rows="10" required></textarea>

                <button type="submit" name="submit">Skicka</button>

            </form>

        </section>

        </section class='messages'>

        <?php

if(isset($_POST['submit'])){

    $comments = $_POST['comment'];

    $sql = "INSERT INTO comments (comment, user, date) VALUES ('$comments', '$username', NOW())";

    $query = mysqli_query($conn, $sql) or die('Det gick inte att ansluta till databasen');

}

            $sql = "SELECT user, comment, date FROM comments ORDER BY date DESC";

            $query = mysqli_query($conn, $sql);

            foreach($query as $userComments){

                extract($userComments);

                echo    "<section>

                            <header>$user<h5>$date</h5></header>

                            <p>$comment</p>

                        </section>";

                       

            }

            mysqli_close($conn);

        ?>

    </section>

</main>

</body>

</html>
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