error using login with sessions

[thejoester]

OK so I wrote this login code a while ago and it has been working great until recently.

I use sessions to hold the login information. Trouble is suddenly I get this error

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

If I simply enter the username/password again, it connects fine. but I always have to log in twice now. and I want to make sure my code is working right.

I do have a php.ini with "register_globals=on" and it doesnt matter.

Here is my code, maybe you can suggest a better way?

//Convert formpass to md5
$securepass=md5($_POST['formpass']);

//Convert username
$uname = $_POST['uname'];

//Connect to the database
include("inc/db.php");

//Get See if there are any matches for the login used
$sql="###SELECT STATEMENT###";
$result = mysql_query($sql,$db);
$myrow = mysql_fetch_assoc($result) or die ("Index.php: There was an Error with the Database, ".mysql_error()."\n");;
	$row_count = mysql_num_rows($result);


//Check if login retuned results
if($row_count > 0)
{
	//Login was sucsessful
	//register the userid and Admin level
	$userid=$myrow["username"];
	$adminaccess=$myrow["admin"];
	session_register("userid");
	session_register("adminaccess");

//Update last access
$logindate = date("Y-m-d");
$result=mysql_query("UPDATE billuser SET lastaccess='$logindate' WHERE username='$uname'") or die ("Failed to enter Last Login, ".mysql_error()."\n");;

//Inlude main page
include("page.php");

}else{ //password does not match, 

//display error
echo "<br><br><center>Incorrect Login, try again</center>";
include("login.htm"); //display login form
exit(); //stop
}

my PHP version is 4.3.11

thanks in advance!

[devinemke]

from the manual (http://www.php.net/manual/en/ref.session.php)

session.bug_compat_42
PHP versions 4.2.3 and lower have an undocumented feature/bug that allows you to initialize a session variable in the global scope, albeit register_globals is disabled. PHP 4.3.0 and later will warn you, if this feature is used, and if session.bug_compat_warn is also enabled. This feature/bug can be disabled by disabling this directive.

session.bug_compat_warn
PHP versions 4.2.3 and lower have an undocumented feature/bug that allows you to initialize a session variable in the global scope, albeit register_globals is disabled. PHP 4.3.0 and later will warn you, if this feature is used by enabling both session.bug_compat_42 and session.bug_compat_warn.

[thejoester]

yes but register globals should be on,
and I have tried setting session.bug_compat_warn to off.

[halojoy]

refering to devinemke post here

if you have access to php.ini - you can change those 2 settings to "0"
session.bug_compat_42
session.bug_compat_warn
(remember you have to RESTART SERVER, if you change php.ini)

you can turn off that check and warning
by using ini_set() somewhere in beginning of your script and set
session.bug_compat_42 = "0"

ini_set( "session.bug_compat_42", "0" );