Markdownify\Converter::indent PHP Method

    protected function indent($str, $output = true)
    {
        if ($this->parser->isStartTag) {
            $this->indent .= $str;
            if ($output) {
                $this->out($str, true);
            }
        } else {
            $this->indent = substr($this->indent, 0, -strlen($str));
        }
    }