Can one add form validation to a PHP page without changing other elements in it?view story

I have a page on a site that I am changing but which I never wrote. It is a page that is the checkout page on a site selling items (checkout.php). The page does many things and posts to itself. What it does, in terms of eyeballing the page and reading from top to bottom is this: Calls another file require: PHP Code: <?php session_start(); require("./UserSQL.inc.php"); which in turn calls another file: PHP Code: <?php require("./DbSql.inc.php"); which in turn calls another f

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