Logging Users Out

So I am using the following code to log people in.


$uid = $rowlogin["UserID_PK"];
session_register("uid");


where $rowlogin is a query on a database of users.
my code for logging someone out looks like this.


session_unregister("uid");
unset($uid);


the problem is that I have this link that links to login.php when the
session isn't registered and logout.php when the session is registered.
This link doesn't update correctly.

After I logout, the link for logout still appears. I have to manually
refresh the browser (press F5) to have the login link appear instead. The
same happens after I log in. Does anyone know what might be going on?

Here's how I check for user login.

method 1

if(isset($uid))
{
echo " logout link html";
}
else
{
echo " login link html";
}

method 2

if(session_is_registered("uid"))
{
echo " logout link html";
}
else
{
echo " login link html";
}

both methods give me the same problem. I have to actually refresh the
page before the links are changed. I know for certain that the $uid
variable and the session has been properly changed. But it seems that the
browser isn't telling the php server to refresh the page, and loading up a
cached page instead.

Any ideas?


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