smarty 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
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.
插件文件和函数必须遵循特定的命名约定以便Smarty识别.
type . name .php
其中type是如下插件中的一种：
- function
- modifier
- block
- compiler
- prefilter
- postfilter
- outputfilter
- resource
- insert
name为仅包含字母、数字和下划线的合法标志符
编写插件
Smarty可自动从文件系统装载插件，或者运行时通过register_* API函数装载。可以通过unregister_* API函数卸载已经装载的插件,只在运行时装载的插件的函数名称不需要遵守命名约定。
如果某个插件依赖其它插件内的某些功能（例如某些插件功能捆绑于Smarty内），那么可以通过如下方法装载必须的插件：
require_once $smarty->_get_plugin_filepath('function', 'html_options');
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