PHP Sessions : Error?!?

[Zenax]

Warning: Unknown: Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively. in Unknown on line 0

Warning: session_register() [function.session-register]: Cannot send session cache limiter - headers already sent (output started at /home/zenax/public_html/index.php:17) in /home/zenax/public_html/index.php on line 45

Both appear after loggin in:

I recieved this when running a script. I am not entirely sure what it means or anything. All I know is that my script ran fine, and this is the first time I have updated the script, even though I have not changed anything regarding the sessions.

I am not complaining as I can run it on my machine, I was just letting you know what I recieved.

Many Kind regards,
Zenax

EDIT: Amended script using a different way of creating the sessions. This removed the error messages. They only seem to appear when using the session_register function.

Original Script:

            <?php

        // Require once the DB script
        require_once('connect_db.php');

        $username = $_POST['username'];
        $password = $_POST['password'];

        // Creating an SQL Query
        $q = "SELECT * FROM users WHERE  users = '$username' and password = '$password'";
        $check = mysql_query($q);

        // Counting the table row
        // If the result is matched then $username, $password must be row 1
        $count = mysql_num_rows($check);

        // Performing login
        if ($count == 1)    {

            session_register('username');
            session_register('password');
            echo 'Welcome '. $_SESSION['username'] .'You are now logged in!';

            }    else    {

                echo 'Wrong username or password specified';
    }
            
?>

Fixed with:

            <?php
        // Require once the DB script
        require_once('connect_db.php');

        $username = $_POST['username'];
        $password = $_POST['password'];

        // Creating an SQL Query
        $q = "SELECT * FROM users WHERE  users = '$username' and password = '$password'";
        $check = mysql_query($q);

        // Counting the table row
        // If the result is matched then $username, $password must be row 1
        $count = mysql_num_rows($check);

        // Performing login
        if ($count == 1)    {

            $_SESSION['username'] = $username;
            $_SESSION['password'] = $password;
            echo 'Welcome '. $_SESSION['username'] .'You are now logged in!';

            }    else    {

                echo 'Wrong username or password specified';
                      }
            
?>

Just in case you wanted to know how I fixed the problem.

[Chris Z]

<?php
session_start();
?>

You didn't need that?

[Zenax]

nope, for some strange reason it works.

Try here:
http://zenax.x10hosting.com/

use madman as username and the password

Just thought I would let you know about the session_registered() function not working. It is not essential, as there are other ways around it. Just thought you might want to know this.