Session lost after 302 redirection

[maxwell44]

Hi,

I have a very strange issue.
I add a rule into my htaccess, which is the following one:

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# Session rule
RewriteRule ^([0-9]+)/(.*) session_script.php?source_traffic=$1&page_name=$2 [L]

Into the script "session_script.php" I have this code :

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<?php
if(!isset($_SESSION))session_start();

include(dirname(__FILE__).'/config.php');

if ( isset($_GET['source_yad']) && isset($_GET['page_yad']) ){

	if (isset($_SESSION['s_landing_page']))	unset('s_landing_page']);
	if (isset($_SESSION['i_source_id']))	unset('i_source_id']);

	$_SESSION['i_source_id'] = $_GET['source_traffic'];
	$_SESSION['s_landing_page'] = $_GET['page_name'];

	header("Location:http://".$_SERVER['HTTP_HOST']."/".$_GET['page_name']);
}
else{
	header("Location:http://".$_SERVER['HTTP_HOST']);
}

?>

At this point if I check the value of the session variable I get the right data.

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<?php
[...]
	$_SESSION['i_source_id'] = $_GET['source_traffic'];
	$_SESSION['s_landing_page'] = $_GET['page_name'];

	var_dump($_SESSION['i_source_id']);

	//header("Location:http://".$_SERVER['HTTP_HOST']."/".$_GET['page_name']);
[...]
?>

result :

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int(2)

Now if I uncomment the redirection. let day the page alias is test, and the template name used is test also.
http://www.mywebsite.com/test


into the template I call just one tag and that's it. the tag name is "session_test"
into this tag I have the following code:

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sesssion_start();
var_dump($_SESSION['i_source_id']);

and the result is:

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NULL

I don't understand. I am loosing the data after the redirection. Maybe the CMS destroy the session ?
Have you got the same problem ? Where it comes from ?

thanks guys.

[maxwell44]

I fix the issue, but I still don't know where it comes from.

I have added this line into the index.php (first line):

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if(!isset($_SESSION)){session_start();}

and now it's working.