<!DOCTYPE html>
<html lang="en">

<head>
    <title>Bootstrap 4 Website Example</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css">
    <script src="https://cdn.jsdelivr.net/npm/jquery@3.7.1/dist/jquery.slim.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js"></script>
    <style>
        .fakeimg {
            height: 200px;
            background: #aaa;
        }
    </style>
</head>

<body>

    <div class="jumbotron text-center" style="margin-bottom:0">
        <h1>Ders Seçim Ekranı</h1>
    </div>

    <nav class="navbar navbar-expand-sm bg-dark navbar-dark">
        <a class="navbar-brand" href="#">Ders Seçim Ekranı</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="collapsibleNavbar">
            </ul>
        </div>
    </nav>

    <div class="container" style="margin-top:30px">
        <div class="row">
            <div class="col-sm-12">

                <?php if (empty($_POST["DersA1"])) { ?>
                    <form action="">
                        <div class="form-group">
                            <label for="ogrenciNo">Öğrenci No:</label>
                            <input type="number" class="form-control" name="ogrenciNo">
                        </div>
                        <div class="form-group">
                            <label for="pwd">Öğrenci Adı Soyadı:</label>
                            <input type="text" class="form-control" name="OgrenciAdSA">
                        </div>
                        <div class="form-group">
                            <label for="DersS">Ders Sayısı:</label>
                            <input type="number" class="form-control" name="DersS">
                        </div>
                        <button type="submit" class="btn btn-primary">İlerle</button>
                    </form>

                <?php } ?>

                <?php if (!empty($_GET["DersS"]) && empty($_POST["DersA1"])) { ?>

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

                        <?php
                        $dersS = $_GET["DersS"];

                        for ($i = 1; $i <= $dersS; $i++) { ?>

                            <div class="form-group">
                                <label for="pwd"><?= $i ?>.Ders Adı </label>
                                <input type="text" class="form-control" name="DersA<?= $i ?>">
                            </div>

                        <?php } ?>

                        <button type="submit" class="btn btn-primary">Kaydet</button>
                    </form>

                <?php } ?>

                <?php if (!empty($_POST["DersA1"])) { ?>

                    <table class="table table-bordered">
                        <thead>
                            <tr>
                                <th>Öğrenci No</th>
                                <th>Adı Soyadı</th>
                                <th>Dersler</th>
                            </tr>
                        </thead>
                        <tbody>
                            <tr>
                                <td><?= $_GET["ogrenciNo"] ?></td>
                                <td><?= $_GET["OgrenciAdSA"] ?></td>
                                <td>
                                    <?php 
                                    
                                    for ($x = 1; $x <= $_GET["DersS"]; $x++) {
                                        echo $_POST["DersA" . $x];
                                        echo "<br>";
                                    }

                                    ?>

                                </td>
                            </tr>
                        </tbody>
                    </table>
                    <a href="?" class="btn btn-info" role="button">Yeni Kayıt</a>
                <?php } ?>


            </div>
        </div>
    </div>

    <div class="jumbotron text-center" style="margin-bottom:0">
        <p>Footer</p>
    </div>

</body>

</html>