smarty是一种模板引擎——即分离后台逻辑和前端样式，源码为PHP编写。官网地址：http://www.smarty.net/
下载最新的3.1版本后，会有demo文件夹，直接在机器的web目录下执行demo就是一个简单的smarty运用。按照文档或者仿照demo里面的配置，使用smarty起来非常简单。
基本的文件目录和代码如下：
templates和templates_c两个文件夹配置必不可少，templates是html模板的目录，templates_c是把HTML编译成可执行的PHP文件目录。
smarty中两个基本函数assign和display，assign是传参（确切应该是：聚合前台需要的数据，并以k-v形式赋值在唯一的一个数组中），display是找到页面显示（接收assign的数组，输出数组数据显示页面）。归根到底smarty最后执行的是编译后的PHP文件，配合PHP的echo、foreach等原生函数和语法输出内容，在templates_c文件夹下面，存放的都是PHP结尾的文件。
smarty2+和smarty3+执行的基本机制如图：
更简单的过程如下：
编译后的index.tpl.php文件：
<html> <head></head> <body> <?php foreach($arr as $key=>$val){ echo "<p>".$key."--".$val."</p>"; } ?> </body> </html> 最后index.php可运行文件：
$arr = array("name"=>"abc","tel"=>"2222","age"=>"2111"); //1、把html编译为PHP（省略掉复杂的smarty标签替换为PHP标签） //2、省略掉中间复杂的编译文件命名、文件引入/写入和cache情况 //3、include 编译后的PHP文件，并执行，注意此时的$arr数组可以在index.tpl.php中使用输出 include "index.tpl.php"; 但是smarty3+版本相比2+而言，“100%重写”，无论是在PHP新语法还是编译执行性能上，下面是2+和3+版本分别执行官方demo中的分析图，左为2.6.18版本，右侧为3.1.30版本：
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