Error:Unknown: Your script possibly relies on a session side-effect which existed unt

[ghjk]

I developed web application using php. But some pages display a error message.

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

Could some one help me? Still I couldn't find what is the wrong with my code.

[pbmods]

Heya, ghjk.

Check out the comments on the Sessions page of the PHP Manual (http://php.net/manual/en/ref.session.php#55239).

[samatair]

The error only appears when you try to update a session variable using 'NULL' value
and try to assign a value to the same named variable in the global scope.
like below. I found this in another site. It worked for me.

<?php
    session_start();
    $_SESSION['sample'] = NULL;
    $sample ="simple";
?>
 

[ghjk]

The error only appears when you try to update a session variable using 'NULL' value
and try to assign a value to the same named variable in the global scope.
like below. I found this in another site. It worked for me.
[PHP]
<?php
session_start();
$_SESSION['sample'] = NULL;
$sample ="simple";
?>
[/PHP]

yes. That's the error. Thanx a lot .

[OfficeTech]

We had just come across this problem with a particular website we are developing and believe that we know of the main cause as we have never received this error before and try to test most limits on development.

The Problem Code:

<?php
  $orderItem = $_SESSION["orderItem"];
  $orderPrice = $_SESSION["orderPrice"];
?>

The Fixed Code:

<?php
  $SorderItem = $_SESSION["orderItem"];
  $SorderPrice = $_SESSION["orderPrice"];
?>

Basiclly we have until now used the exact same name for a session variable in this way, But seems this was the cause of the error for us.

Hope this helps a few people around?
<link removed - no unnecessary links please>

[cell1]

I am getting this error in my Joomla based web site, skicow.com. I can't see any direct assignments to/from $_SESSION using the same key as the assigned variable, however, there are assignments such as the following in the Joomla code:

$session_id = mosGetParam( $_SESSION, 'session_id', '' );

Can anyone tell me if this will cause the errors?

[Markus]

@cell1
Based on the previous replies to this thread, I guess it will cause the error. I suspect the code you posted would expand to something like

$session_id = $_SESSION['session_id'];

which seems to be problematic.

I think if you turn register_globals off, you will circumvent this issue.

[cell1]

Well the code in the mosGetParam function assigning the variable is:

$return = $arr[$name];

where $arr is a parameter taking $_SESSION (or anything else) and return is passed back as the function's result.

Obviously the effect is the same as $session_id = $_SESSION['session_id'], however, I was wondering if the intermediate variables would fool the PHP runtime enough to prevent the warnings.