This throws back to the "register globals" feature of the original PHP ... which turned out to be an extreme security problem and was later scrapped. Any variables listed in the GET or POST data simply became global variables ... "very convenient, no?" Well, no. The problem was that variables could be
arbitrarily inserted, or changed. As others have noted already, you should have a table which lists each name and contains a reference to the proper subroutine. Only entries which actually appear in that table can be considered, and this gives you control over what may actually happen.
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