Zend_Controller_Router_Route_Hostname和端口

最近在配置zend的路由，需要根据不同的二级域名进行权限控制。其中使用到了Zend_Controller_Router_Route_Hostname这个路由。并使用了路由链，配置代码如下：

routes.hostname.type  = "Zend_Controller_Router_Route_Hostname"
routes.hostname.route = ":instance"

routes.hostname.chains.static.route = ":action"
routes.hostname.chains.static.defaults.controller = index

routes.hostname.chains.objects.type = "Zend_Controller_Router_Route_Regex"
routes.hostname.chains.objects.route = "([a-z]+(?:-[a-z]+)?)s(?:/([a-z]+)?)?"
routes.hostname.chains.objects.defaults.action = list
routes.hostname.chains.objects.map.1 = "controller"
routes.hostname.chains.objects.map.2 = "action"
routes.hostname.chains.objects.reverse = "%ss/%s"

routes.hostname.chains.object.type = "Zend_Controller_Router_Route_Regex"
routes.hostname.chains.object.route = "([a-z]+(?:-[a-z]+)?)s/([0-9a-f]{32})(?:/([a-z]+))?"
routes.hostname.chains.object.defaults.action = view
routes.hostname.chains.object.map.1 = "controller"
routes.hostname.chains.object.map.2 = "id"
routes.hostname.chains.object.map.3 = "action"
routes.hostname.chains.object.reverse = "%ss/%s/%s"

routes.hostname.chains.children.type = "Zend_Controller_Router_Route_Regex"
routes.hostname.chains.children.route = "((?:[a-z]+s/[1-9]\d*/)*)([a-z]+(?:-[a-z]+)?)s/([0-9a-f]{32})/([a-z]+(?:-[a-z]+)?)s(?:/([a-z]+))?"
routes.hostname.chains.children.defaults.action = list
routes.hostname.chains.children.map.1 = "ancestors"
routes.hostname.chains.children.map.2 = "parent_cls"
routes.hostname.chains.children.map.3 = "parent_id"
routes.hostname.chains.children.map.4 = "controller"
routes.hostname.chains.children.map.5 = "action"
routes.hostname.chains.children.reverse = "%s%ss/%s/%ss/%s"

 发现程序中生成的url的端口号全部丢失。仔细看代码源码发现Zend_Controller_Router_Route_Chain中的assemble方法

   public function assemble($data = array(), $reset = false, $encode = false)
    {
        $value = '';

        foreach ($this->_routes as $key => $route) {
            if ($key > 0) {
                $value .= $this->_separators[$key];
            }
            
            $value .= $route->assemble($data, $reset, $encode);
            
            if (method_exists($route, 'getVariables')) {
                $variables = $route->getVariables();
                
                foreach ($variables as $variable) {
                    $data[$variable] = null;
                }
            }
        }

        return $value;
    }

 循环调用路由，但是在Zend_Controller_Router_Route_Hostname中的match方法中

 // Get the host and remove unnecessary port information
        $host = $request->getHttpHost();
        if (preg_match('#:\d+$#', $host, $result) === 1) {
            $host = substr($host, 0, -strlen($result[0]));
        }

 这段去掉了端口号，而Zend_Controller_Router_Route_Chain中有将这里返回的url与后面的url拼接，这样产生的url端口自然就丢失了。不知道当时作者为什么要这样写，是不是因为有其他的原因？返回带端口的url有何不可？希望对PHP熟悉的人给予解释。