I am trying to find a reliable method to clean out all session
variables and start clean.
Running PHP 4.3.1 on Win2K developing a web app to run on Linux.
Session cookies are enabled, register globals is off. I access all
session variables with $_SESSION.
What I have found is that if I use unset($_SESSION), set a single
variable, and redirect, the OLD session data is passed to the new page.
However if I use session_unset() or $_SESSION = array() and set my
single variable, the data is passed properly.
Shouldn't unset($_SESSION) work?
Example:
Delete the session file, run something that leaves other session data
around (or just leave it empty if you prefer), then try this:
test1.php:
<?php
session_start();
# Can also use session_unset() below
$_SESSION = array();
$_SESSION["Test1"] = "test1";
header("Location: http://localhost/test2.php";);
exit;
?>
test2.php:
<?php
session_start();
var_dump($_SESSION);
?>
This will work, the second script will show only the single element
"Test1" in $_SESSION.
However if you replace:
$_SESSION = array();
in test1.php with:
unset($_SESSION);
then test2.php will show whatever session data was present prior to
invoking test1, and will not show the "Test1" array element in
$_SESSION. In other words it not only retains the old values, but
fails to save the new ones.
----------
Tom Rawson
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