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Extended Setup
扩展设置

This is a continuation of the basic installation, please read that first!
这是基本安装的继续,请先阅读那个文件!

A slightly more flexible way to setup Smarty is to extend the class and initialize your Smarty environment. So instead of repeatedly setting directory paths, assigning the same vars, etc., we can do that in one place. Lets create a new directory "/php/includes/guestbook/" and make a new file called "setup.php". In our example environment, "/php/includes" is in our include_path. Be sure you set this up too, or use absolute file paths.

一个更灵活一点的配置Smarty的方法是扩展类,和初始化你的smarty环境。
为了避免重复地配置路径,我们可以在一个文件里配置这些变量。
我们创建一个目录 "/php/includes/guestbook/" 建立一个文件"setup.php"
同样先设置好smarty路径。

Example 2-10. Editing /php/includes/guestbook/setup.php
例2-10.编辑 /php/includes/guestbook/setup.php

// load Smarty library
require('Smarty.class.php');

// The setup.php file is a good place to load
// required application library files, and you
// can do that right here. An example:
// require('guestbook/guestbook.lib.php');是一个很好的加载应用程序的类库文件(就是扩展类)
//例如你可以在index文件里包含它

class Smarty_GuestBook extends Smarty {

   function Smarty_GuestBook() {
   
   		// Class Constructor. These automatically get set with each new instance.
               //类构造函数.创建实例的时候自动配置

		$this->Smarty();

		$this->template_dir = '/web/www.mydomain.com/smarty/guestbook/templates/';
		$this->compile_dir = '/web/www.mydomain.com/smarty/guestbook/templates_c/';
		$this->config_dir = '/web/www.mydomain.com/smarty/guestbook/configs/';
		$this->cache_dir = '/web/www.mydomain.com/smarty/guestbook/cache/'; 
		
		$this->caching = true;
		$this->assign('app_name','Guest Book');
   }

}

Now lets alter the index.php file to use setup.php:
现在我们针对setup文件更改一下index文件

Example 2-11. Editing /web/www.mydomain.com/docs/guestbook/index.php
例 2-11.编辑/web/www.mydomain.com/docs/guestbook/index.php

require('guestbook/setup.php');

$smarty = new Smarty_GuestBook;

$smarty->assign('name','Ned');

$smarty->display('index.tpl');

Now you see it is quite simple to bring up an instance of Smarty, just use Smarty_GuestBook which automatically initializes everything for our application.
现在你看到创建一个使用smarty的实例有多么的简单.从Smarty_GuestBook开始,重新构建我们的应用程序吧^_^