login2.php

<?php
session_start();
include "inc/koneksi.php";

if(@$_SESSION['admin'] || @$_SESSION['operator']) {
    header("location: index.php");
} else {
?>

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <title>NF Jati Mekar</title>

    <!-- Bootstrap -->
    <link href="css/bootstrap.min.css" rel="stylesheet">

    <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
      <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
      <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
  <style type="text/css">
  body{
    background-color: #eee;
  }
  </style>
  </head>
  <body>

  <div class="container">
      <p><br/></p>
      <div class="row">
          <div class="col-xs-6 col-sm-4"></div>
          <div class="col-xs-6 col-sm-4"></div>
          <div class="clearfix visible-xs-block"></div>
          <div class="col-xs-6 col-sm-4">
              <div class="panel panel-info">
                 <div class="panel-body">
                      <div class="page-header">
                            <h3><p class="text-center">Login Area</p></h3>
                      </div>
                      <form role="form" action="" method="post">

                      <?php
                      $user = @$_POST['user'];
                      $pass = @$_POST['pass'];
                      $login = @$_POST['login'];

                      if($login)  {
                          if($user == "") {
                              echo "Username tidak boleh Kosong";
                          } else if($pass == "") {
                              echo "Password tidak boleh kosong";
                          } else {
                              $sql = mysql_query("select * from tb_login where username = '$user' and password = md5('$pass')") or die (mysql_error());
                              $data = mysql_fetch_array($sql);
                              $cek = mysql_num_rows($sql);
                              if($cek >= 1) {
                                  if($data['level'] == "admin") {
                                      @$_SESSION['admin'] = $data['kode_user'];
                                      header("location: index.php");
                                  } else if($data['level'] == "operator") {
                                      @$_SESSION['operator'] = $data['kode_user'];
                                      header("location: index.php");
                                  }
                              } else {
                                 echo "login gagal";
                              }
                          }
                      }
                      ?>
                          <div class="form-group">
                              <label for="exampleInputEmail1">Username</label>
                              <div class="input-group">
                                  <span class="input-group-addon"><span class="glyphicon glyphicon-user"></span></span>
                                  <input type="text" name="user" class="form-control" id="exampleInputEmail1" placeholder="username">
                              </div>
                          </div>
                          <div class="form-group">
                              <label for="exampleInputPassword1">Password</label>
                              <div class="input-group">
                                  <span class="input-group-addon"><span class="glyphicon glyphicon-lock"></span></span>
                                  <input type="password" name="pass" class="form-control" id="exampleInputPassword1" placeholder="Password">
                              </div>
                          </div>
                          <hr/>
                          <button type="button" class="btn btn-success"><span class="glyphicon glyphicon-plus"></span> Daftar</button>
                          <button type="submit" name="login" value="Login" class="btn btn-primary"><span class="glyphicon glyphicon-log-in"></span> Login</button>
                          <p><br/></p>
                      </form>
                  </div>
              </div>
          </div>
      </div>
  </div>

    <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
    <script src="https://ajax.googleapis.com/ajax/li/jquery/1.11.3/jquery.min.js"></script>
    <!-- Include all compiled plugins (below), or include individual files as needed -->
    <script src="js/bootstrap.min.js"></script>
  </body>
</html>

<?php
}
?>