Please help with PHP Sessions!! Ah!!!

[dloeppky]

Hi all,

Can someone please explain how sessions work in PHP v4+? Here is what I have.

I have a logout page:

session_destroy();
echo "<script language='javascript'>";
echo "document.location='login.php';";
echo "</script>";

I get the error message:
Trying to destroy uninitialized session in

I have a login page: (at the very top)
session_start();
session_register("SESSION");

I initialize later with:
$row = mysql_fetch_array($sql_result);
$SESSION["var1"] = $row[0];

Later in my code I have this... I want I logout link to display so long as the session is still active.
<?PHP
if (isset($SESSION))
{ echo " | <a href='logout.php'>Logout</a>"; }
?>

It doesn't work. When I click the logout button
1 -get that error
2 -the logout link always displays.

Thanks a bunch,
David

[planetsim]

try if(session_is_registered("session_name"))

also use $_SESSION['session_name'];

[corporateboy]

remember to run

session_start()

at the top of your logout page

[wama_tech]

Also u don't have to register a varriable to the session first ..u may use this directly

$_SESSION['var1']=$whatever;

and to check if it is registered u may also use

if( isset($_SESSION'var1']) ){

 print("hey i am watching u");

}

good luck