PHP: give alert popup then redirect the page

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Do something like
header("Location: index.php?Message=" . urlencode($Message));
Then on index.php...
if (isset($_GET['Message'])) {
    print $_GET['Message'];
}
In other words, index.php will always check if it's being passed a message in the url. If there is one, display it. Then, just pass the message in the redirect
if you really want to use a modal popup, generate the js...
if (isset($_GET['Message'])) {
    print '<script type="text/javascript">alert("' . $_GET['Message'] . '");</script>';
}

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