Login lgout and login without closing session gives redirection error

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I am stepping through a text book that sets up different websites. The
one I am testing is user registration.

I set up the scripts and this is what I observe:

Login (verifying against a mysql db) - no problem.
Logout                               - no problem.

Close the browser and try again - no problem.

Login > Logout > Login WITHOUT closing browser I get:

An error occurred while loading http://login.php when it should redirect
me to http://localhost/index.php.

I read somewhere on the news group that the
header("Location: http://" . $_SERVER['HTTP_HOST'] . dirname
($_SERVER['PHP_SELF']) . "/index.php") (in my example code) is called
once and so the error?

The logout.php destroys the $_SESSION variables, session itself and any
cookies so I thought it would be "like new" the second time around?

It appears to be linked to sessions but don't know enough to know how to

Please help,

Thank you,
Peter Brown

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