zf direct的问题

$this->_redirect (string $url, array $options);
这其中的options指的到底是什么参数？？

[php]    /**
     * Set a redirect URL string
     *
     * By default, emits a 302 HTTP status header, prepends base URL as defined
     * in request object if url is relative, and halts script execution by
     * calling exit().
     *
[b]    * $options is an optional associative array that can be used to control
     * redirect behaviour. The available option keys are:
     * - exit: boolean flag indicating whether or not to halt script execution when done
     * - prependBase: boolean flag indicating whether or not to prepend the base URL when a relative URL is provided
     * - code: integer HTTP status code to use with redirect. Should be between 300 and 307.[/b]
     *
     * _redirect() sets the Location header in the response object. If you set
     * the exit flag to false, you can override this header later in code
     * execution.
     *
     * If the exit flag is true (true by default), _redirect() will write and
     * close the current session, if any.
     *
     * @param  string $url
     * @param  array  $options
     * @return void
     */
    public function setGotoUrl($url, array $options = array())
    {
        // prevent header injections
        $url = str_replace(array("\n", "\r"), '', $url);

        $exit        = $this->getExit();
        $prependBase = $this->getPrependBase();
        $code        = $this->getCode();
        if (null !== $options) {
            if (isset($options['exit'])) {
                $this->setExit(($options['exit']) ? true : false);
            }
            if (isset($options['prependBase'])) {
                $this->setPrependBase(($options['prependBase']) ? true : false);
            }
            if (isset($options['code'])) {
                $this->setCode($options['code']);
            }
        }

        // If relative URL, decide if we should prepend base URL
        if (!preg_match('|^[a-z]+://|', $url)) {
            $url = $this->_prependBase($url);
        }

        $this->_redirect($url);
    }[/php]