Cara membuat form pendaftaran dengan PHP Tanpa Database

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    <?php 

        session_start();

     ?>

     <form method="POST" >

        <input type="text" name="username" placeholder="username"> <br><br>

        <input type="password" name="password_kamu" placeholder="password"> <br><br>

        <input type="submit" name="masuk" value="login">

     </form>

    <?php 

        if(isset($_POST['masuk'])){

            $username = $_POST['username'];

            $password_kamu = $_POST['password_kamu'];

            if($username == 'user1'){

                if($password_kamu == '123'){

                    $_SESSION['user'] = $username;

                    header('location: beranda.php');

                }else{

                    echo "

                    <script>

                        alert(' PASSWORD SALAH ... !! ');

                    </script>

                ";

                }

            }else{

                echo "

                    <script>

                        alert(' USERNAME TIDAK TERDAFTAR..!! ');

                    </script>

                ";

            }

        }

     ?>

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    <?php 

        session_start();

        if(!$_SESSION['user']){

            header('location:index.php');

        }

     ?>

     <h2>Selamat Datang, <?php echo $_SESSION['user']; ?> di blog langsungkoding</h2>

     <br>

     <br>

     <form method="POST">

         <input type="submit" name="logout" value="logout">

     </form>

     <?php 

       if (isset($_POST['logout'])) {

           session_unset($_SESSION['user']);

           header("location:index.php");

       }

      ?>