What are some alternative methods for creating a login window in PHP that do not require JavaScript?

When creating a login window in PHP without using JavaScript, one alternative method is to use HTML forms with PHP for form validation and processing. This can be achieved by submitting the form data to a PHP script that checks the credentials and redirects the user accordingly. 

<?php
session_start();

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Check if the username and password are correct
    $username = $_POST['username'];
    $password = $_POST['password'];

    if ($username == 'admin' && $password == 'password') {
        // Set session variables and redirect to dashboard
        $_SESSION['username'] = $username;
        header('Location: dashboard.php');
        exit();
    } else {
        $error = "Invalid username or password";
    }
}
?>

<!DOCTYPE html>
<html>
<head>
    <title>Login</title>
</head>
<body>
    <h2>Login</h2>
    <?php if(isset($error)) { echo $error; } ?>
    <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
        <label for="username">Username:</label><br>
        <input type="text" id="username" name="username"><br>
        <label for="password">Password:</label><br>
        <input type="password" id="password" name="password"><br>
        <input type="submit" value="Login">
    </form>
</body>
</html>

Keywords

HTML CSS PHP sessions form handling server-side validation

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