آموزش ساخت صفحه لاگین ساده با php همراه با فیلم

 <div id="login">
   <div class="form">Login Form</div>
      <form action="login.php" method="post">
         <input type="email" name="email" placeholder="Email">
         <input type="password" name="password" placeholder="password">
         <input type="submit" value="Login">
      </form>
</div>

 body {
            background: #133751;
        }
        #login {
            width: 400px;
            margin-left: -200px;
            background: #359ace;
            position: absolute;
            top: 25%;
            left: 50%;
            padding: 10px;
            border: 1px solid black;
        }
        #login input[type=email],
        #login input[type=password] {
            display: block;
            width: 90%;
            margin-top: 5px;
            padding: 5px;
        }
        #login input[type=submit] {
            width: 50%;
            margin-left: 25%;
            margin-top: 10px;
            padding: 7px;
            cursor: pointer;
            background: #666666;
            color: #ffffff;
            border: none;
        }
        .form {
            text-align: center;
            font-size: 20px;
            color: #ffffff;
            border-bottom: 1px solid #ffffff;
            padding-bottom: 10px;
            margin-bottom: 20px;
        }

 session_start();
if($_SERVER['REQUEST_METHOD'] == 'POST') {
    if($_POST['email'] == 'alireza@yahoo.com' && $_POST['password'] == '1234') {
       $_SESSION['is_login'] = true;
    } else {
        header('Location: form.php');
    }
} elseif (!isset($_SESSION['is_login'])) {
    header('Location: form.php');
}

 <a href="?action=logout">Logout</a>

 if(isset($_GET['action'])) {
    $_SESSION = [];
}