note 9506 added to isset

Maybe it was my inexperience that got the best of me in not using this function. if ($foo) seemed to have worked up until we installed PHP4.0.3 Patch level one. When we upgraded, we started getting a warning Undefined variable foo in D:\\path\dir\file.php. This had us stumped for a good while and now we are having to go through and clean the code back up. Couldn't have just been my inexperience though, the creator of the phpPoll seems to have done that same thing. Few other errors showed up that had to be fixed as well. My advice, use this function even if you haven't upgraded yet, you will be glad you did. Hope this helps somebody that is either running into this same problem or that person who sees this function as unnecessary. http://www.php.net/manual/function.isset.php