I want to add a set of values to the session variable $BOOKS. This is the
code which I used.

                #this seems to be the first book which the user has selected
                $BOOKS = $bookid; #this param comes from the URL
                $BOOKS = $BOOKS+","+$bookid;

Here the 'if..' part gets executed, and because of that I cannot add details
of another book. I have initialised the session and added the registered the
value "BOOKS" in the previous page.

Thanks in advance,

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