我正在构建我的网站，这是我的页面控制器，
/**
* this file handles the retrieval and serving of page
*/
class controller_core
{
public $connection = null;
public $page_model = null;
public $authentication_admin = null;
public $authentication_member = null;
public $constant = null;
public function __construct($connection)
{
$this->connection = $connection;
$this->page_model = new __page_model($connection);
$this->authentication_admin = new __authentication_admin($connection);
$this->authentication_member = new __authentication_member($connection);
$this->constant = new __constant_model($connection);
}
public function render_page($authenticated_admin, $authenticated_member, $backbone)
{
# ob_start - Turn on output buffering. It lets you put output into a buffer instead of sending it directly to the client.
# in computing, a buffer is a region of memory used to temporarily hold data while it is being moved from one place to another.
ob_start();
# set variable for users
$user_primary = null;
$user_secondary = null;
$user_tertiary = null;
$user_quartary = null;
# set variable for members
$member_primary = null;
$member_secondary = null;
$member_tertiary = null;
# store the db connection object in the variable
$connection = $this->connection;
# determine it is a root user or a sub user from the class of authentication_admin
$category_admin = $this->authentication_admin->get_admin_category($authenticated_admin);
$category_member = $this->authentication_member->get_member_category($authenticated_member);
# set either one of the user type to true
switch($category_admin)
{
case 'user_primary':
$user_primary = true;
break;
case 'user_secondary':
$user_secondary = true;
break;
case 'user_tertiary':
$user_tertiary = true;
break;
case 'user_quartary':
$user_quartary = true;
break;
}
# set either one of the user type to true
switch($category_member)
{
case 'member_primary':
$member_primary = true;
break;
case 'member_secondary':
$member_secondary = true;
break;
case 'member_tertiary':
$member_tertiary = true;
break;
}
# get the constant values from the class of constant
$cst_value_site_title = $this->constant->get_constant('site_title')->cst_value;
$cst_value_site_slogan = $this->constant->get_constant('site_slogan')->cst_value;
$cst_value_meta_description = $this->constant->get_constant('meta_description')->cst_value;
$cst_value_meta_keywords = $this->constant->get_constant('meta_keywords')->cst_value;
# if $_REQUEST pg exists
if(isset($_REQUEST['pg_url']))
{
# show the requested page
# always send the value of $authentication_admin to the class of page:
# if $authentication_admin has a value, you can see this page even if it is hidden
# if $authentication_admin has a value, you can see this page only if it is published
$page = $this->page_model->get_page($_REQUEST['pg_url'],$category_admin);
$parent = $this->page_model->get_parent($page);
# store the date into the variable
$parent_id = $page->parent_id;
$tmp_path = $page->tmp_path;
# get the main template/ html document
include $backbone;
//print_r($authentication_admin);
}
else
{
# if no special page is requested, we'll show the default page
$page = $this->page_model->get_page(DEFAULT_PAGE,$category_admin);
$parent = $this->page_model->get_parent($page);
#store the date into the variable
$parent_id = $page->parent_id;
$tmp_path = $page->tmp_path;
#get the main template/ html document
include$backbone;
#print_r($parent);
}
#Return the contents of the output buffer.
return ob_get_contents();
#Clean (erase) the output buffer and turn off output buffering.
ob_end_clean();
}
}
是从上面的父控制器类扩展的类，但是你可以看到我正在从父类重复一些（很多！）变量，
class controller_extended extends controller_core
{
function __construct($connection)
{
parent::__construct($connection);
}
public function render_page($authenticated_admin, $authenticated_member, $backbone)
{
# set variable for users
$user_primary = null;
$user_secondary = null;
$user_tertiary = null;
$user_quartary = null;
# set variable for members
$member_primary = null;
$member_secondary = null;
$member_tertiary = null;
# store the db connection object in the variable
$connection = $this->connection;
# determine it is a root user or a sub user from the class of authentication_admin
$category_admin = $this->authentication_admin->get_admin_category($authenticated_admin);
$category_member = $this->authentication_member->get_member_category($authenticated_member);
# if $_REQUEST tag_name exists
if(isset($_REQUEST['tag_name']))
{
# get the value from the request
if(isset($_REQUEST['pg_url'])) $pg_url = $_REQUEST['pg_url'];
if(isset($_REQUEST['tag_name'])) $tag_name = $_REQUEST['tag_name'];
if(isset($_REQUEST['str_id'])) $str_id = $_REQUEST['str_id'];
# show the requested page
# always send the value of $authentication_admin to the class of page:
# if $authentication_admin has a value, you can see this page even if it is hidden
# if $authentication_admin has a value, you can see this page only if it is published
$page = $this->page_model->get_page($pg_url,$category_admin);
$parent = $this->page_model->get_parent($page);
if(empty($str_id))
{
# get the included template
switch($pg_url)
{
case 'publications':
$tmp_path = 'resources_publication_subitem.php';
break;
case 'tender-opportunities':
$tmp_path = 'resources_tender_opportunitie_subitem.php';
break;
case 'research-topics':
$pg_url = $tag_name;
$tmp_path = 'item_content_research_topics.php';
break;
case 'videos':
$tmp_path = 'video_tagged.php';
break;
case 'forum':
$tmp_path = 'forum_subitem.php';
break;
case 'ener-exchange':
$tmp_path = 'exchange_subitem.php';
break;
}
}
else
{
# store the date into the variable
$parent_id = $page->parent_id;
# get the included template
switch($pg_url)
{
case 'forum':
$tmp_path = 'item_forum.php';
break;
case 'ener-exchange':
$tmp_path = 'item_exchange.php';
break;
}
}
# get the main template/ html document
include $backbone;
}
else
{
parent::render_page($authenticated_admin, $authenticated_member, $backbone);
}
}
}
如何处理这些重复变量？也许我错误地控制了控制器？
感谢。
修改
抱歉不清楚。我的扩展类中的render_page方法覆盖了父类中的render_page方法，因此我认为我无法使用parent关键字来获取我存储在其中的变量render_page方法。我该怎么办？感谢。
答案 0 :(得分：-1)
很难了解这些变量在部署中的目的是什么，但仅仅从查看这里有什么可以考虑的事情。
您可以将用于确定用户级别的开关放在父类的受保护方法中。这样，用于检查用户级别的逻辑可以由任何后代控制器中的render_page调用。您可以传入get_admin_category中的值并返回一个字符串，以便可以重用switch语句。
此外，您的示例中输出缓冲背后的意图是什么？我发现你最后在include $backbone包含了你的模板，但是你为什么要做缓冲呢？在大多数发布的MVC中，控制器执行一些预处理，调用模型方法并排列数据，然后将其传递给视图，这是向客户端呈现的唯一内容（例如，我知道CodeIgniter通过传递'来实现这一点'输出'数组到视图，可以包含通过回显等输出的值）。不应该将输出延迟到客户端，因为在大多数MVC中，只有在加载视图后才会出现这种情况。
从你使用$ _REQUEST超全局的外观来看，你依靠这个来执行请求到服务器上实际脚本的路由（我可能会误解，只是试图解释给出的内容。）许多MVC还将利用mod_rewrite（）执行到一个入口点（前端控制器）的所有路由，然后依靠脚本通过调用url中路径的子构造函数来处理所有路由。这是一个很好的练习教程，而不是部署，目的： http://www.phpaddiction.com/tags/axial/url-routing-with-php-part-one/
如果您是在理解Front Controller模式的练习中，那么您可以查看很多很棒的框架并从中学习一些技巧。 CodeIgniter和Kohanna非常棒，相对轻巧，可以很容易地看到引擎盖下。显然，Zend也非常受欢迎。