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How do I reopen a session in PHP without getting header already sent warnings? After setting all the session vars I like to set, I close the session with session_write_close() . I do this, because as long as the session is open, there may be only one active connection from the same client. But I like to have multiple parallel ones. However if I like to set another session variable at a later point, I need to reopen the session with session_start() once again. This works, but as I already send code to the client it prints "headers already sent"-warnings. Why is it trying to set the cookie again? The cookie is already set. Only thing I need is to gain access to writing the session files on the server again. Well, I can suppress them. But is there a way of reopening a session, that has been closed with session_write_close without re-sending the Cookie-header? The Cookie-header is already sent correctly by the first session_start(). So the second one just needs to give me back access to writing to the session files stored on the web server. <?php session_start(); // setting all the session vars I like to set session_write_close(); // <-- // To allow parallel requests by the same user, while this script is still running // Code that takes some time to execute // It also prints output, so no more cookie headers after this point @session_start(); // <-- works, but I like to use it without suppressing warnings $_SESSION['key'] = 'new value I like to store'; session_write_close(); ?>

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