I have some code which will loop over the whole $_POST array, runs it
through mysql_real_escape_string and then writes it all back to the array
again, which seams to work. Are there any incompatibility problems or such
like with writing into the $_POST or $_GET array?

    function clean_post()
        $npost = array();

        while ($value = current($_POST))
            $key = key($_POST);
            $npost += array("$key" => mysql_real_escape_string($value));

        $_POST = $npost;

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