unset($esctype);
if (preg_match_all('/\%([A-Fa-f0-9]{2})/',$_SERVER['QUERY_STRING'], $cmat)) {
    foreach($cmat[1] as $c) {
        if (!ctype_digit($c)) {
            if (strtoupper($c) == $c) {
                if (!isset($esctype) || $esctype == 'up')
                    $esctype = 'up';
                elseif ($esctype == 'low') {
                    $esctype = 'mix';
                    break;
                }
            }
            elseif (strtolower($c) == $c) {
                if (!isset($esctype) || $esctype == 'low')
                    $esctype = 'low';
                elseif ($esctype == 'up') {
                    $esctype = 'mix';
                    break;
                }
            }
            else {
                $esctype = 'mix';
                break;
            }
        }
    }
}