Chapter 16. Extending Smarty With Plugins[第十六章.以插件扩展Smarty]

Table of Contents
How Plugins Work 插件如何工作
Naming Conventions 命名约定
Writing Plugins 编写插件
Template Functions 模板函数插件
Modifiers 修饰插件
Block Functions 区块函数插件
Compiler Functions 编译函数插件
Prefilters/Postfilters 预滤器/补滤器插件
Output Filters 输出过滤插件
Resources 资源插件
Inserts 嵌入插件

Version 2.0 introduced the plugin architecture that is used for almost all the customizable functionality of Smarty. This includes:

2.0版本引入了被广泛应用于自定义Smarty功能的插件机制。它包括如下类型：

functions 函数插件
modifiers 修饰插件
block functions 区块函数插件
compiler functions 编译函数插件
prefilters 预滤器插件
postfilters 补滤器插件
outputfilters 输出过滤插件
resources 资源插件
inserts 嵌入插件

With the exception of resources, backwards compatibility with the old way of registering handler functions via register_* API is preserved. If you did not use the API but instead modified the class variables $custom_funcs, $custom_mods, and other ones directly, then you will need to adjust your scripts to either use the API or convert your custom functionality into plugins.

为了与旧有方式保持向后兼容，除资源插件外，保留了通过register_* API方式装载函数的处理方法。如果你不是使用API方式而是使用直接修改类变量 $custom_funcs, $custom_mods 等的方法，那么你就需要修改你的程序了。或者使用API的方法，或者将你的自定义功能转换成插件。

How Plugins Work插件如何工作

Plugins are always loaded on demand. Only the specific modifiers, functions, resources, etc invoked in the templates scripts will be loaded. Moreover, each plugin is loaded only once, even if you have several different instances of Smarty running within the same request.

插件总在需要的时候被装载。只有在模板脚本里调用的特定修饰、函数、资源插件等会被装载。此外，即便在同一个请求中有几个不同的Smarty实体运行，每个插件也只被装载一次。

Pre/postfilters and output filters are a bit of a special case. Since they are not mentioned in the templates, they must be registered or loaded explicitly via API functions before the template is processed. The order in which multiple filters of the same type are executed depends on the order in which they are registered or loaded.

预/补过滤器插件和输出过滤器插件的装载方式有些不同。由于在模板中未被提及，它们必须在模板被处理前通过API函数明确地装入系统。同类型的多个过滤器插件依据被装载的次序先后不同分别先后执行。

The plugins directory can be a string containing a path or an array containing multiple paths. To install a plugin, simply place it in one of the directories and Smarty will use it automatically.

插件目录是包含一条路径信息的字符串或包含多条路径信息的字符串数组。安装插件的时候，将插件置于其中一个目录下，Smarty会自动识别使用。