Markdownify\Converter::unstack PHP Method

    protected function unstack()
    {
        if (!isset($this->stack[$this->parser->tagName]) || !is_array($this->stack[$this->parser->tagName])) {
            trigger_error('Trying to unstack from empty stack. This must not happen.', E_USER_ERROR);
        }
        return array_pop($this->stack[$this->parser->tagName]);
    }