// nie script loginnya
<?php
include "konek.php";
$username = $_POST['username'];
$password = $_POST['password'];
$perintah="SELECT * FROM anggota WHERE username='".$_POST
['username']."' and password='".$_POST['password']."'";
$hasil=mysql_query($perintah);
$row=mysql_fetch_array($hasil);
$id="$row[no]";
if($username==""||$password=="")
{
        $pesan="<center>Username atau Password belum diisi.<br>";
        header("location:./index.php?err=$pesan");
}
else
{
        if ($row['username']==$username and $row['password']
==$password)
        {
                if ($row[level]=='1')
                {session_register("namauser");
                session_register("passuser");
                $namauser=$row[username];
                $passuser=$row[password];
                header("location: manag_sys.php");
        }
        else
        {
                session_register("namauser");
                session_register("passuser");
                session_register("iduser");
                $namauser=$row[username];
                $passuser=$row[password];
                $iduser=$row[no];
                header("location: pelanggan.php");
        }
}
else
{
        $pesan1="<center>Username/Password tidak benar";
        header("location:./index.php?err=$pesan1");
}
}
?>



//nie script yang ada disetipa halaman yang bila ingin masuk 
memerlukan login


<?php
session_start();
if (!empty ($_SESSION['namauser']) && !empty ($_SESSION['passuser']))
{
?>

Bila saya hapus "if" diatas baru script tersebut jalan...
Bila tidak maka akan tetap di form login...

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