php-session-demo/index.php at main · ProgrammerZamanNow/php-session-demo · GitHub

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<?php
session_start();

if (isset($_SESSION['user'])) {
    header('Location: user.php');
    exit;
}

$error = '';

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $user = $_POST['user'] ?? '';
    $password = $_POST['password'] ?? '';

    if ($user !== '' && $user === $password) {
        $_SESSION['user'] = $user;
        header('Location: user.php');
        exit;
    }

    $error = 'Login gagal, user dan password tidak cocok.';
}
?>
<!DOCTYPE html>
<html lang="id">
<head>
    <meta charset="UTF-8">
    <title>Login</title>
    <style>
        body { font-family: sans-serif; display: flex; justify-content: center; align-items: center; height: 100vh; margin: 0; background: #f4f4f4; }
        .login-box { background: #fff; padding: 2rem; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,.1); width: 320px; }
        h1 { margin-top: 0; font-size: 1.25rem; }
        label { display: block; margin-top: .75rem; font-size: .9rem; }
        input[type=text], input[type=password] { width: 100%; padding: .5rem; box-sizing: border-box; border: 1px solid #ccc; border-radius: 4px; }
        button { margin-top: 1rem; width: 100%; padding: .6rem; background: #2563eb; color: #fff; border: 0; border-radius: 4px; cursor: pointer; }
        button:hover { background: #1d4ed8; }
        .error { color: #b91c1c; margin-top: .75rem; font-size: .9rem; }
    </style>
</head>
<body>
    <div class="login-box">
        <h1>Login</h1>
        <form method="post" action="index.php">
            <label for="user">User</label>
            <input type="text" id="user" name="user" required>

            <label for="password">Password</label>
            <input type="password" id="password" name="password" required>

            <button type="submit">Login</button>

            <?php if ($error !== ''): ?>
                <div class="error"><?= htmlspecialchars($error) ?></div>
            <?php endif; ?>
        </form>
    </div>
</body>
</html>