开发一个web项目，通常分为两部分，一部分是gui，即界面、美工，使用html,css,js编写，另一部分则是业务逻辑，即程序、功能，使用php编写。而模板引擎则是联系这两部分的“桥梁”，可理解成一个php类，里面定义了许多方法，实现了将php的原始输出加载上界面样式后再输出。
没用模板之前的编写的代码是这样的：
<?php echo $title; ?>
这样的话美工与逻辑没有分离，简单的说就是PHP程序员不仅要写程序还要精通美工，这往往十分困难，因此需要将这两部分工作分开。
在此通过自己创建一个简单的模板引擎为例子，更好的体会模板引擎的原理。
之前说了开发一个web项目分成GUI与业务逻辑两部分，因此我们创建两个文件夹，一个命名为“templates”，里边存放模板，新建一个tpl.html文件，另一个命名为“PHP”，里边存放业务逻辑，新建一个index.php文件。
tpl.html文件代码通常是这样：
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<{$title}> <{ $content;}>
可以看出来，和之前的代码相比，tpl.html中只有html代码，没有php代码，但是增加了新的标签，这类标签是自己定义的，里面的内容只有经过模板引擎编译后才能被识别，编译后的文件存放在“templates_c”文件夹下。这个文件主要是界面设计用的，将大量使用到CSS，JS等技术。
这时候tpl.html和index.php仍旧是分离的，互不干扰，因此需要一个“桥梁”连接，即模板引擎，其实就是一个PHP类，故在此可以创建一个mytpl.class.php的PHP文件。
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SDCMS-B2C商城网站管理系统是一个以php+MySQL进行开发的B2C商城网站源码。 本次更新如下： 【新增的功能】 1、模板引擎增加包含文件父路径过滤； 2、增加模板编辑保存功能过滤； 3、增加对统计代码参数的过滤 4、新增会员价设置（每个商品可以设置不同级不同价格） 5、将微信公众号授权提示页单独存放到data/wxtemp.php中，方便修改 【优化或修改】 1、修改了check_b
mytpl.class.php文件通常定义一个类MyTpl，类中需定义一个数组tpl_var[]用于存放tpl.html中自定义内容标签的参数，此外还需定义一些方法，这些方法最主要的目的是将tpl.hml中无法识别的的内容标签转换成PHP语句，然后再写到一个“templates_c”文件夹下的tpl_c.html中，这个过程就是所谓的编译。
通常tpl_c.html文件的代码是这样的：
<?php echo $this->tpl_var[“title”]; ?></head> <body><?php echo $this->tpl_var[“content”]; ?}></body> </html></pre><p>可以看出上面的代码是可以被识别的，因为自定义的内容标签已经被替换成PHP语句了，但是title和content的值是多少我们还不得而知，这时候之前创建的index.php要上场了.<br></p> <h3 id="indexphp通常它代码是这样的">index.php通常它代码是这样的：</h3><pre class="brush:php;toolbar:false;">include “tpl.class.php文件”;//加载模板引擎 $tpl = new MyTpl();//实例化一个模板类 $title = “标题”; $content = “内容”; $tpl->assign(“title”,$title);//调用模板类中的方法，分配变量 $tpl->assign(“content”,$content); $tpl->display(“tpl.html”);//调用模板类中的方法，用于显示编译后的内容</pre><p>上面的代码只是一些简单的描述代码，其中的变量的值可以是直接定义的也可以是从数据库中获取的，此外该文件还可以编写一些复杂的PHP程序，这也就是之前说的业务逻辑。</p> <p>这样GUI和业务逻辑的工作就分离了，美工设计人员只需要编写模板文件就可以改变web的界面，而PHP程序员则可以专心编写自己的程序。</p> <p>公司内部一般都有自己的模板引擎，而通常模板引擎自己写的话完全没有必要，因为市面上已经有一些很成熟的模板引擎了，比如Smarty，我们只需要懂得如何使用它就好了。</p> <p>推荐学习：《<a href="https://www.php.cn/course/list/29.html" target="_blank">PHP视频教程</a>》<br></p> </div> <div class="artmoreart "> <div class="artdp artptit"><span></span> <p>相关文章</p> </div> <div class="artmores 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