function chk_glob($identifiers, $super, $db_escape = 1)
{
    /*
        Using $_GET, $_POST, $_COOKIE, $_SERVER arrays are annoying
        because before you use them you have the check that the value
        exists. Then you have to escape it so there is a lot of code
        duplication and it's boring. There is also no succinct way of
        knowing whether the allocation was successful. This function
        solves that . . . and to stop duplication further it works on
        a list of idenitifers.
    */
    $identifiers = explode(",", $identifiers);
    $status = 1;
    foreach($identifiers as $identifier)
    {
        global $$identifier;
        /*
           Variable variables cannot be used with super globals hence
           we copy it to a non-super global variable and free it.
        */
        if($db_escape)
        {

            $$identifier = empty($super["$identifier"]) ? "" : mysql_escape_string(urldecode($super["$identifier"]));
        }
        else
        {
            $$identifier = empty($super["$identifier"]) ? "" : urldecode($super["$identifier"]);
        }

        if(empty($$identifier))
        {
            $status = 0;
        }
    }
    return $status;
}