[php/mysql] edytowanie rekordow Opcje

[dirtyhustlaz]

skrypt pobiera mi dane z bazy i pokazuje je w formularzu, ale jak chce je zminie i chce zaktualizowac to wywala mi blad:

[PHP] pobierz, plaintext 
Notice: Undefined index: id in F:\EasyPHP-12.1\www\glencaldy\editstudent.php on line 33
[PHP] pobierz, plaintext 

w tabeli 'student' mam pola: studentid, firstname, surname, username, password. chce zeby moliwa byla edycja wsyzstkich poza studentid.
jak zmienialem w tej 33 lini id na student id to wogole nie pobiera danych i nie wyskakuje ten blad juz na glownej stronie. oto kod mojego skryptu edycji danych. moglby ktos mi pomoc z tym albo dac jakies wskazowki? musze to skonczyc do szkoly w tym tygodniiu

[PHP] pobierz, plaintext 
 <?php
 
// Connects to your Database
 
mysql_connect("localhost", "root", "") or die(mysql_error());
 
mysql_select_db("glencaldy") or die(mysql_error());
 
 
//checks cookies to make sure they are logged in
 
if (isset($_COOKIE['ID_my_site'])) {
    $username = $_COOKIE['ID_my_site'];
 
    $pass = $_COOKIE['Key_my_site'];
 
    $check = mysql_query("SELECT * FROM student WHERE username = '$username'") or die(mysql_error());
 
    while ($info = mysql_fetch_array($check)) {
        //if the cookie has the wrong password, they are taken to the login page
 
        if ($pass != $info['password']) {
            header("Location: login.php");
 
        }
 
 
 
        //otherwise they are shown the admin area   
 
        else {
            $a  = trim($_REQUEST['a']);
            $id = trim($_GET['id']);
            if ($a == 'edit' and !empty($id)) {
                $result = mysql_query("SELECT * FROM student WHERE
    studentid='$id'") or die('Error');
 
                if (mysql_num_rows($result) > 0) {
                    // read content of table
                    $r = mysql_fetch_assoc($result);
                    echo "<h1>EDIT STUDENT</h1><p>";
                    echo '<form action="editstudent.php" method="post">
        <input type="hidden" name="a" value="save" />
        <input type="hidden" name="studentid" value="' . $id . '" />
        First name:<br />
        <input type="text" name="firstname"
        value="' . $r['firstname'] . '" /><br />
        Surname:<br />
        <input type="text" name="surname"
        value="' . $r['surname'] . '" /><br />
      Username:<br />
        <input type="text" name="username"
        value="' . $r['username'] . '" /><br />
      Password:<br />
        <input type="text" name="password"
        value="' . $r['password'] . '" /><br />
        <input type="submit" value="Update Record" />
        </form>';
                    echo "<a href=deletestudent.php><< Back to delete/edit menu</a><p>";
                    echo "<a href=menu.php><< Back to main menu</a><p>";
 
                }
 
            }
        }
 
    }
} elseif ($a == 'save') {
    // get the new records from form
    $id        = $_POST['studentid'];
    $firstname = trim($_POST['firstname']);
    $surname   = trim($_POST['surname']);
    $username  = trim($_POST['username']);
    $password  = trim($_POST['password']);
    // update table
    mysql_query("UPDATE studnet SET firstname='$firstname',
    surname='$surname', username='&username', password='$password' WHERE studentid='$id'") or die('Error');
    echo 'records updated';
}
 
else
//if the cookie does not exist, they are taken to the login screen
    {
    header("Location: login.php");
 
}
 
?>
[PHP] pobierz, plaintext 

tutaj wrzucam paczke z calym skryptem: https://dl.dropbox.com/u/63492647/glencaldy_dp.zip