234      * @param string $string
238     protected function pad($string, $len)  argument
240         $strlen = $this->strlen($string);
241         if ($strlen > $len) return $string;
244         return $string . str_pad('', $pad, ' ');
253     protected function strlen($string)  argument
256         $string = preg_replace("/\33\\[\\d+(;\\d+)?m/", '', $string);
259             return mb_strlen($string, 'utf-8');
262         return strlen($string);
266      * @param string $string
271     protected function substr($string, $start = 0, $length = null)  argument
274             return mb_substr($string, $start, $length);
278                 return substr($string, $start, $length);
280                 return substr($string, $start);