login.php

<!DOCTYPE html>
<html class="bg-black">
    <head>
        <meta charset="UTF-8">
        <title>Login Aplikasi Web Programming</title>
        <meta content='width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no' name='viewport'>

        <link href="css/bootstrap.min.css" rel="stylesheet" type="text/css" />

        <link href="css/font-awesome.min.css" rel="stylesheet" type="text/css" />

        <link href="css/AdminLTE.css" rel="stylesheet" type="text/css" />

        <link href="vendors/bower_components/animate.css/animate.min.css" rel="stylesheet">

        <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>

        <script src="https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>

    </head>
    <body class="bg-black">
<center><h1>SISTEM INFORMASI TANPA JUDUL</h1></center>
<center><small>By.Kel.Titis Kasania Putri From Web Developer</small></center>
        <div class="form-box" id="login-box">
            <div class="header">Login</div>
         <div class="body bg-gray">

         <form action="" method="post">
          <div class="form-group has-feedback">
            <select name='level' class="form-control" required>
              <option value='0' selected>- Pilih Level -</option>
              <option value='admin'> Admin</option>
              <option value='user'> User</option>

            </select>
          </div>

          <div class="form-group">
            <input type="text" class="form-control" name='a' placeholder="Username" required>
          </div>
          <div class="form-group">
            <input type="password" class="form-control" name='b' placeholder="Password" required>

          </div>
          </div>
            <div class="footer">
              <button name='login' type="submit" class="btn bg-olive btn-block">Masuk</button>
              <a href="#" class="text-center">Registrasi</a>

          </div>
        </form>
      </div>
    </div>

        <script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.2/jquery.min.js"></script>

        <script src="../../js/bootstrap.min.js" type="text/javascript"></script>

    </body>
</html>


<?php
  if(isset($_POST[login])){

    if ($_POST[level]=='admin'){
      $pass=md5($_POST[b]);
      $login=mysql_query("SELECT * FROM tb_pengguna WHERE username='".mysql_real_escape_string($_POST[a])."' AND password='$pass' AND level='admin'");
      $cocok=mysql_num_rows($login);
      $r=mysql_fetch_array($login);

        if ($cocok > 0){

          session_start();
          $_SESSION[id]           = $r[id_user];
          $_SESSION[namalengkap]  = $r[nama_lengkap];
          $_SESSION[level]        = $r[level];

          echo "<script>window.alert('Sukses Login Sebagai Administrator.');
                window.location='index.php'</script>";
        }else{
          echo "<script>window.alert('Username atau Password anda salah.');
                window.location='index.php?act=gagal'</script>";
           }
        }elseif($_POST[level]=='user'){
      $pass=md5($_POST[b]);
      $login=mysql_query("SELECT * FROM tb_pengguna WHERE username='".mysql_real_escape_string($_POST[a])."' AND password='$pass' AND level='user'");
      $cocok=mysql_num_rows($login);
      $r=mysql_fetch_array($login);

        if ($cocok > 0){
          session_start();
          $_SESSION[id]           = $r[id_user];
          $_SESSION[namalengkap]  = $r[nama_lengkap];
          $_SESSION[level]        = $r[level];

          echo "<script>window.alert('Sukses Login Sebagai User.');
                window.location='index.php'</script>";
        }else{
          echo "<script>window.alert('Username atau Password anda salah.');
                window.location='index.php?act=gagal'</script>";
        }

    }
  }
?>