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  1. I understand PRG ("post redirect get") as follows: "index.php" welcomes visitor. Visitor adds data, clicks submit button. A new "Post page" appears and a Chart is displayed. Visitor continues adding data to this "post.php" page via the "Add New Data" button (... as visitor adds data, "post.php" continues posting to itself, and displays updated Chart. ) When visitor is finished, visitor clicks the "Finished" button. if(isset($_POST["finished"])) { // insert all data into mySQL for upcoming INVOICE; header("location:thank-you.php",true,303); exit; } The "thank-you.php" page retrieves and displayes the mySQL data as an invoice. QUESTIONS: 1.) Anything I could do better? 2.) When visitor is on the "thank-you.php" page, reloading (F5) simply reloads the page without resubmitting data. This is good, right? (I understand that's the purpose of PRG, avoiding multiple invoices and resubmittal of data) 3.) BUT....if visitor clicks the Browser Back Button, browser displays "Document Expired: document no longer available." Is this supposed to happen? Is this normal behavior? Thank you, as always, I appreciate the help and the "pushes in the right direction."
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