register.php

<?php

// Database connection
$conn = mysqli_connect("localhost", "root", "", "example_db");

// Register logic
if(isset($_POST['register'])) {
    $username = $_POST['username'];
    $password = $_POST['password'];
    $role = 'student';

    // Check if username is already taken
    $query = "SELECT * FROM users WHERE username='$username'";
    $result = mysqli_query($conn, $query);
    $isUsernameTaken = mysqli_num_rows($result) > 0;

    if(!$isUsernameTaken) {
        // Insert user into database
        $query = "INSERT INTO users (username, password, role) VALUES ('$username', '$password', '$role')";
        mysqli_query($conn, $query);
        echo "Registration successful. You can now login as a student.";
    } else {
        echo "Username is already taken";
    }
}

?>

<!DOCTYPE html>
<html>
<head>
    <title>Login and Register Form</title>
</head>
<body>

    <h1>Register</h1>
    <form method="POST">
        <input type="text" name="username" placeholder="Username" required><br>
        <input type="password" name="password" placeholder="Password" required><br>
        <button type="submit" name="register">Register</button>
    </form>
    <h1><a href="index.php">Beranda</a></h1>
</body>
</html>