🎯 Features:

• Login system
• Form validation
• Role-based dashboard
• Status using ternary
• Match (modern PHP)

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📁 1. index.php (Login Form)

<form method="POST" action="login.php">
    <h2>Login</h2>
    
    <input type="text" name="username" placeholder="Enter Username"><br><br>
    <input type="password" name="password" placeholder="Enter Password"><br><br>
    
    <button type="submit">Login</button>
</form>

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🔐 2. login.php (Validation + Login Logic)

<?php
$username = $_POST['username'] ?? '';
$password = $_POST['password'] ?? '';// ✅ Form Validation (if-else)
if (empty($username) || empty($password)) {
    echo "All fields are required ❗";
    exit;
}// ✅ Dummy Users (Database simulation)
$users = [
    "admin" => ["password" => "1234", "role" => "admin"],
    "john"  => ["password" => "1111", "role" => "user"],
    "editor"=> ["password" => "2222", "role" => "editor"]
];// ✅ Login Check
if (isset($users[$username]) && $users[$username]['password'] === $password) {
    
    $role = $users[$username]['role'];    // ✅ Ternary (status message)
    $status = ($role === "admin") ? "High Privilege User" : "Normal User";    echo "Login Successful ✅<br>";
    echo "Status: $status <br>";    // Redirect to dashboard
    header("refresh:2;url=dashboard.php?role=$role");} else {
    echo "Invalid Credentials ❌";
}
?>

---

🧠 3. dashboard.php (Switch + Match)

<?php
$role = $_GET['role'] ?? 'guest';echo "<h2>Dashboard</h2>";// ✅ Switch Case (old method)
switch ($role) {
    case "admin":
        echo "Welcome Admin 👑<br>";
        break;
    case "editor":
        echo "Welcome Editor ✍️<br>";
        break;
    case "user":
        echo "Welcome User 👤<br>";
        break;
    default:
        echo "Welcome Guest 🚫<br>";
}// ✅ Match Expression (modern PHP 8+)
$access = match($role) {
    "admin" => "You have FULL access",
    "editor" => "You can EDIT content",
    "user" => "You can VIEW content",
    default => "No Access",
};echo "<br>Access Level: $access";
?>

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🧪 What Students Learn

✔ If-Else → form validation & login
✔ Ternary → quick status logic
✔ Switch → role-based UI
✔ Match → modern cleaner logic
✔ Real-world structure (multi-file project)

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💡 Extra Improvements (Homework)

Ask students to:

• Add logout button
• Use sessions instead of GET
• Add registration page
• Store users in database (MySQL)

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🎯 Teaching Tip

Run this project locally (XAMPP/WAMP):

http://localhost/project-folder/