Sto faticosamente cercando di capire qualcosa di PHP, prendendo esempio da un libro ma...

login.php

codice:
<?php
session_unset();
?>
<html>
 <head>
  <title>Please Log In</title>
 </head>
 <body>
<?php include 'header.php'; ?>
  <form method="post" action="movie1.php">
   

Enter your username: 
    <input type="text" name="user"/>
   </p>
   

Enter your password: 
    <input type="password" name="pass"/>
   </p>
   


    <input type="submit" name="submit" value="Submit"/>
   </p>
  </form>
 </body>
</html>
movie1.php
codice:
<?php
session_start();
$_SESSION['username'] = $_POST['user'];
$_SESSION['userpass'] = $_POST['pass'];
$_SESSION['authuser'] = 0;

//Check username and password information
if (($_SESSION['username'] == 'Joe') and
    ($_SESSION['userpass'] == '12345')) {
    $_SESSION['authuser'] = 1;
} else {
    echo 'Sorry, but you don\'t have permission to view this page!';
    exit();     
}
?>
<html>
 <head>
  <title>Find my Favorite Movie!</title>
 </head>
 <body>
<?php include 'header.php'; ?>
<?php
$myfavmovie = urlencode('Life of Brian');
echo "<a href=\"moviesite.php?favmovie=$myfavmovie\">";
echo "Click here to see information about my favorite movie!";
echo "</a>";
?>
  


  

  Or choose how many movies you would like to see:
  

  <form method="post" action="moviesite.php">
   

Enter number of movies (up to 10): 
    <input type="text" name="num" maxlength="2" size="2"/>
    

    Check to sort them alphabetically: 
    <input type="checkbox" name="sorted" />
   </p>     
   <input type="submit" name="submit" value="Submit"/>
  </form>
 </body>
</html>
Mi saltano fuori errori quando provo dalla pagina login.php a "lanciare" la movie1.php

L'errore è questo
Notice: Undefined index: user in C:\nginx\html\script\movie1.php on line 3

Notice: Undefined index: pass in C:\nginx\html\script\movie1.php on line 4
Sorry, but you don't have permission to view this page!

che in pratica dovrebbe voler dire che manca il controllo "isset" sui parametri, ma i parametri... non arrivano a movie1.php

Come mai? HELLLPPPPP!!!