protected function dumpConstants($constants)
    {
        $str = '';
        if ($constants && $this->debug->output->getCfg('outputConstants')) {
            $str = '<dt class="constants">constants</dt>'."\n";
            foreach ($constants as $k => $value) {
                $str .= '<dd class="constant">'
                    .'<span class="constant-name">'.$k.'</span>'
                    .' <span class="t_operator">=</span> '
                    .$this->debug->output->html->dump($value)
                    .'</dd>'."\n";
            }
        }
        return $str;
    }