note 100409 deleted from function.isset by danbrown

Note Submitter: dbergan at gmail dot com ---- I ran into issues with isset() behaving counter-intuitively when I was checking user-input via forms... so I spent a few hours testing isset() and its siblings empty(), is_null(), and strlen() and put the results in a large table on my site to clarify their behavior and highlighted the areas that might get a programmer in trouble. Hope you find this useful. http://www.davidbergan.com/Summa/Php Kind regards, David