Membuat Batasan Akses

<?php
    session_start();

    // Cek apakah pengguna sudah login
    $is_logged_in = isset($_SESSION['user_id']);

    // Jika belum login, arahkan ke halaman login
    if (!$is_logged_in) {
        header('Location: /auth/login.php');
        exit(); // Pastikan script berhenti dieksekusi setelah pengalihan
    }

    $currentPage = basename($_SERVER['PHP_SELF']);
?>

<!DOCTYPE html>
<html lang="en">
    <head>
        <title>My Project</title>
        <link href="/assets/vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">
        <link href="/assets/css/style.css" rel="stylesheet">
    </head>
    <body>

        <nav class="navbar bg-dark navbar-expand-lg bg-body-tertiary" data-bs-theme="dark">
            <div class="container">
                <a class="navbar-brand" href="#">
                    <img src="/assets/img/kitakale-white-logo.png" width="100" alt="">
                </a>
                <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarText" aria-controls="navbarText" aria-expanded="false" aria-label="Toggle navigation">
                    <span class="navbar-toggler-icon"></span>
                </button>
                <div class="collapse navbar-collapse" id="navbarText">
                    <ul class="navbar-nav me-auto mb-2 mb-lg-0">
                        <li class="nav-item">
                            <a class="nav-link <?= ($currentPage == 'index.php') ? 'active' : ''; ?>" aria-current="page" href="/index.php">Home</a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link <?= ($currentPage == 'data-pengguna' || $currentPage == 'create.php' || $currentPage == 'edit.php'  || $currentPage == 'detail.php') ? 'active' : ''; ?>" href="/views/data-pengguna">Data Pengguna</a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link" href="#">Data Barang</a>
                        </li>
                    </ul>
                    <div class="navbar-text">
                        <a class="nav-link" href="/auth/logout.php">Sign Out</a>
                    </div>
                </div>
            </div>
        </nav>
        <main>
            <div class="container mt-5">

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