Cara membuat login member

1.CREATE TABLE user ( 2.username varchar(20), 3.password varchar(20), 4.level varchar(20), 5.PRIMARY KEY(username) 6.); 1.INSERT INTO `user` VALUES ('a', 'pass1', 'admin'); 2.INSERT INTO `user` VALUES ('b', 'pass2', 'admin'); 3.INSERT INTO `user` VALUES ('c', 'pass3', 'user'); 4.INSERT INTO `user` VALUES ('d', 'pass4', 'user'); 5.INSERT INTO `user` VALUES ('e', 'pass5', 'user'); <form method="post" action="loginsubmit.php"> <table border="0"> <tr> <td>Masukkan Username </td> <td><input name="username" type="text"></td> </tr> <tr> <td>Masukkan Password </td> <td><input name="pass" type="password"></td> </tr> <tr> <td> </td> <td><input type="submit" name="Submit" value="Submit"></td> </tr> </table> </form> mysql_connect('dbhost', 'dbuser', 'dbpass'); mysql_select_db('dbname'); $username = $_POST['username']; $password = $_POST['pass']; $query = "SELECT * FROM user WHERE username = '$username'"; $hasil = mysql_query($query); $data = mysql_fetch_array($hasil); if ($password == $data['password']) { echo "<h1> Login Sukses</h1> "; $_SESSION['level'] = $data['level']; $_SESSION['username'] = $data['username']; include "menu.php"; } else echo "<h1> Login gagal</h1> "; ?> <?php session_start(); if ($_SESSION['level'] == "admin") { echo "<a href='hal1.php'>Halaman 1</a> "; echo "<a href='hal2.php'>Halaman 2</a> "; echo "<a href='hal3.php'>Halaman 3</a> "; echo "<a href='logout.php'>Logout</a> "; } else if ($_SESSION['level'] == "user") { echo "<a href='hal3.php'>Halaman 3</a>"; echo "<a href='logout.php'>Logout</a> "; } ?> if (isset($_SESSION['level']) && isset($_SESSION['username'])) { include "menu.php"; if ($_SESSION['level'] == "admin") { echo "<h1> Halaman 1</h1> "; echo "<p> Selamat datang di halaman satu wahai user : ".$_SESSION['username']."</p> "; echo "<p> Ini adalah konten halaman 1</p> "; } else { echo "<h1> Maaf.. Anda bukan user berlevel Administrator</h1> "; } } else { echo "<h1> Nah.. Anda pasti mencoba akses halaman ini tanpa login ya?</h1> "; } ?> session_start(); if (isset($_SESSION['level']) && isset($_SESSION['username'])) { include "menu.php"; if (($_SESSION['level'] == "admin") || ($_SESSION['level'] == "user")) { echo "<h1> Halaman 3</h1> "; echo "<p> Selamat datang di halaman tiga wahai user : $_SESSION['username']."</p> "; echo "<p> Ini adalah konten halaman 3</p> "; } } else { echo "<h1> Nah.. Anda pasti mencoba akses halaman ini tanpa login ya?</h1> "; } ?> session_start(); session_destroy(); echo "<h1> Anda sudah logout</h1> "; echo "<p> <a href='formlogin.htm'>Login Kembali</a></p> "; ?>