index.php

<!DOCTYPE html>
<!--[if lt IE 7 ]> <html lang="en" class="ie6 ielt8"> <![endif]-->
<!--[if IE 7 ]>    <html lang="en" class="ie7 ielt8"> <![endif]-->
<!--[if IE 8 ]>    <html lang="en" class="ie8"> <![endif]-->
<!--[if (gte IE 9)|!(IE)]><!--> <html lang="en"> <!--<![endif]-->
<head>
<meta charset="utf-8">
<title>ZyroLabs Login</title>
<link rel="stylesheet" type="text/css" href="assets/css/style.css" />

</head>
<body>
<div class="container">
	<section id="content">
		<form action="" method="POST">
			<h1>Login</h1>
			<div>
				<input type="text" placeholder="Username" required="" id="username" name="username" />
			</div>
			<div>
				<input type="password" placeholder="Password" required="" id="password" name="password" />
			</div>
			<div>
				<input type="submit" value="Log in" name="login" />

			</div>
		</form><!-- form -->

	</section><!-- content -->
</div><!-- container -->
</body>
</html>


<?php
include ("koneksi.php");
session_start();
error_reporting(0);

if(isset ($_POST['login'])){

$username = $_POST['username'];
$password = md5($_POST['password']);
$md5=md5($password);
$sql = mysql_query("SELECT * FROM tbl_akun WHERE username='$username' && password='$password'");
$num = mysql_num_rows($sql);

if ($num==1) {
	// login benar //
	// memulai session
if (isset($_SESSION['level']))
{
  // jika level admin
  if ($_SESSION['level'] == "1")
   {
    header('location: admin/db.php');
   }
   // jika kondisi level user maka akan diarahkan ke halaman lain
   else if ($_SESSION['level'] == "2")
   {
       header('location: kasir/kasir.php');
   }
}
	$_SESSION['username'] = $username;
	$_SESSION['password'] = $password;
	header("Location: admin/db.php");
}else {
	//JIka Login Salah //
?>

<script languange="javascript">
	{
		alert("Username atau Password Salah");
		javascript:history.back();
	}
</script>
<?php
}
mysql_close();
}
?>