Undefined index in PHP

It's where you test to see that is isn't there. It should be !isset($_POST['SUBMIT']). This is because the index, SUBMIT, won't be set, thus won't have a value such as true to pass the if(...). isset() checks to see if the index/variable is actually set.

Try this:

    if (!isset($_POST['SUBMIT'])){   //ERROR: Undefined index
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    }
    else {
    //code here
    }
?>