PHP Error - "Warning"

I created a test server on my computer and when tring to test my login script, it woulnt work, so i create a "auto login" page that would set the session so i would be loged in without loging in. apon loading this page, i got this error:

Code:

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<b>Warning</b>:  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 <b>Unknown</b> on line <b>0</b><br />

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i'm not completely sure what it means, but i gather that you're using a method that isn't used anymore, and seems to rely on register_globals being enabled.

post the code you're using.

Here is what it on the "auto login" page

PHP Code:

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<?PHP
$logged_in_admin = "dclamp";
session_register("logged_in_admin");
?>

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Here is the actual login code:

PHP Code:

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<?PHP
            $links = "<A HREF='main.php'>Click here to proceed to the main page</A><BR>
                  You Will Be Redirected In 2 Seconds.<br>
                  <META HTTP-EQUIV='refresh' content='2;URL=http://www.homtek.net/admin/main.php'>";
            if ($admin && $pass) {
                if ($logged_in_admin == $admin) {
                    echo $admin.", you are already logged in.<BR><BR>";
                    echo $links;
                    exit;
                } 

                $result = mysql_query("SELECT * FROM admin_login WHERE username = '".$admin."'
                            AND password = PASSWORD('".$pass."')");

                if (!$result) {
                    echo "Sorry, there has been an error. Please try again, or contact technical support.";
                    exit;
                }

                if (mysql_num_rows($result) > 0) {
                    $logged_in_admin = $admin;
                    session_register("logged_in_admin");
                    echo "Welcome, ".$logged_in_admin.". <BR><BR>";
                    echo $links;
                    exit;

                } else {
                    echo "<font color=red>Invalid login. Please try again.</font><BR><BR>";
                }

            } else if ($admin || $pass) {
                echo "<font color=red>Please fill in both fields.</font><BR><BR>";
            }
             ?>
             <FORM METHOD=POST ACTION="login.php">
             Your username:
             <INPUT NAME="admin" TYPE=TEXT MAXLENGTH=20 SIZE=20>
             <BR>
             Your password:
             <INPUT NAME="pass" TYPE=PASSWORD MAXLENGTH=10 SIZE=10>
             <BR>
             <INPUT TYPE=SUBMIT VALUE="Login">
             </FORM>

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