code: private function _rightStr($n, $txt)
      {
          $rv = '';
          $length = mb_strlen($txt, 'UTF-8');
          for ($i = $n; $i < $length; $i++) {
              $rv .= mb_substr($txt, $i, 1, 'UTF-8');
          }
  
          return $rv;
      }
docs: Vrati pravou cast retezce od urcite pozice
  
  @param int $n Index
  @param string $txt Vstupni text
  
  @return string Oriznuty retezec