Index.
php
<?php
session_start();
include "function.php";
$koneksi = new mysqli ("localhost","root","","db_perpustakaan");
if ($_SESSION['admin'] || $_SESSION['user']){
?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Perpustakaan</title>
         <!-- BOOTSTRAP STYLES-->
   <link href="assets/css/bootstrap.css" rel="stylesheet" />
   <!-- FONTAWESOME STYLES-->
   <link href="assets/css/font-awesome.css" rel="stylesheet" />
   <!-- MORRIS CHART STYLES-->
   <link href="assets/js/morris/morris-0.4.3.min.css" rel="stylesheet" />
      <!-- CUSTOM STYLES-->
   <link href="assets/css/custom.css" rel="stylesheet" />
   <!-- GOOGLE FONTS-->
  <link href='http://fonts.googleapis.com/css?family=Open+Sans' rel='stylesheet'
type='text/css' />
  <link href="assets/js/dataTables/dataTables.bootstrap.css" rel="stylesheet" />
</head>
<body>
   <div id="wrapper">
      <nav class="navbar navbar-default navbar-cls-top " role="navigation" style="margin-
bottom: 0">
         <div class="navbar-header">
           <button type="button" class="navbar-toggle" data-toggle="collapse" data-
target=".sidebar-collapse">
              <span class="sr-only">Toggle navigation</span>
              <span class="icon-bar"></span>
              <span class="icon-bar"></span>
              <span class="icon-bar"></span>
           </button>
           <a class="navbar-brand" href="index.html">Admin</a>
         </div>
  <div style="color: white;
padding: 15px 50px 5px 50px;
float: right;
font-size: 16px;"> Last access : <?php echo date('l, d-m-Y'); ?>   <a href="logout.php"
class="btn btn-danger square-btn-adjust">Logout</a> </div>
      </nav>
        <!-- /. NAV TOP -->
           <nav class="navbar-default navbar-side" role="navigation">
         <div class="sidebar-collapse">
           <ul class="nav" id="main-menu">
                                <li class="text-center">
               <img src="assets/img/buku.jpg" class="user-image img-responsive"/>
                                        </li>
          <li>
             <a class="active-menu" href="index.php"><i class="fa fa-dashboard fa-3x"></i>
Dashboard</a>
          </li>
           <li>
              <a class="active-menu" href="?page=anggota"><i class="fa fa-users fa-3x"></i>
Data Anggota</a>
           </li>
          <li>
             <a class="active-menu" href="?page=buku"><i class="fa fa-book fa-3x"></i>
Data Buku</a>
          </li>
            <li>
               <a class="active-menu" href="?page=transaksi"><i class="fa fa-table
fa-3x"></i> Transaksi</a>
            </li>
         </ul>
       </div>
    </nav>
    <!-- /. NAV SIDE -->
    <div id="page-wrapper" >
      <div id="page-inner">
<div class="row">
  <div class="col-md-12">
    <?php
      $page = $_GET['page'];
      $aksi = $_GET['aksi'];
      if ($page == "buku")
      {
          if ($aksi == ""){
             include "page/buku/buku.php";
          }elseif ($aksi == "tambah"){
             include "page/buku/tambah.php";
          }elseif ($aksi == "ubah"){
             include "page/buku/ubah.php";
          }elseif ($aksi == "hapus"){
             include "page/buku/hapus.php";
          }
      }elseif ($page == "anggota"){
         if ($aksi == ""){
          include "page/anggota/anggota.php";
          }elseif ($aksi == "tambah"){
             include "page/anggota/tambah.php";
          }elseif ($aksi == "ubah"){
             include "page/anggota/ubah.php";
          }elseif ($aksi == "hapus"){
             include "page/anggota/hapus.php";
          }
          }elseif ($page == "transaksi"){
          if ($aksi == "")
          {
             include "page/transaksi/transaksi.php";
          }elseif ($aksi == "tambah"){
             include "page/transaksi/tambah.php";
          }elseif ($aksi == "kembali"){
             include "page/transaksi/kembali.php";
          }elseif ($aksi == "perpanjang"){
             include "page/transaksi/perpanjang.php";
          }
      }elseif ($page=="") {
          include "home.php";
      }
    ?>
             </div>
           </div>
           <!-- /. ROW -->
            <!-- /. ROW -->
    </div>
          <!-- /. PAGE INNER -->
         </div>
       <!-- /. PAGE WRAPPER -->
      </div>
    <!-- /. WRAPPER -->
    <!-- SCRIPTS -AT THE BOTOM TO REDUCE THE LOAD TIME-->
    <!-- JQUERY SCRIPTS -->
    <script src="assets/js/jquery-1.10.2.js"></script>
     <!-- BOOTSTRAP SCRIPTS -->
    <script src="assets/js/bootstrap.min.js"></script>
    <!-- METISMENU SCRIPTS -->
    <script src="assets/js/jquery.metisMenu.js"></script>
    <!-- MORRIS CHART SCRIPTS -->
    <script src="assets/js/morris/raphael-2.1.0.min.js"></script>
    <script src="assets/js/morris/morris.js"></script>
     <!-- CUSTOM SCRIPTS -->
    <script src="assets/js/dataTables/jquery.dataTables.js"></script>
    <script src="assets/js/dataTables/dataTables.bootstrap.js"></script>
      <script>
         $(document).ready(function () {
            $('#dataTables-example').dataTable();
         });
    </script>
       <!-- CUSTOM SCRIPTS -->
    <script src="assets/js/custom.js"></script>
</body>
</html>
<?php
}else {
header("location: login.php");
}
?>