关于PHP模板
有哪些模板可以将PHP代码与HTML代码分离开。各自的优缺点如何？
------解决方案--------------------
Smarty
1. 速度：采用Smarty编写的程序可以获得最大速度的提高，这一点是相对于其它的模板引擎技术而言的。
2. 编译型：采用Smarty编写的程序在运行时要编译成一个非模板技术的PHP文件，这个文件采用了PHP与HTML混合的方式，在下一次访问模板时将WEB请求直接转换到这个文件中，而不再进行模板重新编译（在源程序没有改动的情况下）
3. 缓存技术：Smarty选用的一种缓存技术，它可以将用户最终看到的HTML文件缓存成一个静态的HTML页，当设定Smarty的cache属性为true时，在Smarty设定的cachetime期内将用户的WEB请求直接转换到这个静态的HTML文件中来，这相当于调用一个静态的HTML文件。
4. 插件技术：Smarty可以自定义插件。插件实际就是一些自定义的函数。
5. 模板中可以使用if/elseif/else/endif。在模板文件使用判断语句可以非常方便的对模板进行格式重排。
不适合使用Smarty的地方
1. 需要实时更新的内容。例如像股票显示，它需要经常对数据进行更新，导致经常重新编译模板，所以这类型的程序使用Smarty会使模板处理速度变慢。
2. 小项目。小项目因为项目简单而美工与程序员兼于一人的项目，使用Smarty会在一定程度上丧失PHP开发迅速的优点
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