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    Backing Up through a Form submission


    I have an application written in PHP/MySQL.

    How can I keep users from using the "back" function and accidentally re-submitting a form that they have just submitted?

    Thanks
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    The 6 worst sins of security ē How to (properly) access a MySQL database with PHP

    Why canít I use certain words like "drop" as part of my Security Question answers?
    There are certain words used by hackers to try to gain access to systems and manipulate data; therefore, the following words are restricted: "select," "delete," "update," "insert," "drop" and "null".

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