这个功能的位置就是在于后台系统菜单，就可以看到扩展变量这个功能了 如图所示：
1帝国cms后台系统设置里面的扩展变量是干什么的？ 帝国cms后台系统设置里面的扩展变量是干什么的？
那么这个具体是干什么的呢？那么这个功能站长朋友们通过自定义扩展变量功能，用户可以自定义公共的程序使用变量，为用户扩展系统带来便利。比如可以增加像系统 $public_r[newsurl]这样的变量，还比如扩展了某个系统模型，需要增加设置项都可以用扩展变量来实现。
下面就做一个简单的例子说明一下：
比如我们要实现模板图片的变量地址，那么就点击该功能，再次点击增加扩展变量，然后就填写我们的变量的信息，如图所示：
2帝国cms后台系统设置里面的扩展变量是干什么的？ 帝国cms后台系统设置里面的扩展变量是干什么的？
然后我们需要调用的时候要怎么调用呢，很简单的就如这样的形式$public_r[‘add_变量名’]可取得变量内容，那么我们这里的变量名是temppicpath，那么完整的调用模式是 $public_r[‘add_temppicpath’]，比如我们要调用模板css目录中style.css，那么调用的模式是这样的：
<link href="<?=$public_r['add_temppicpath']?>css/style.css" rel="stylesheet" type="text/css" />
那么这个就很方面把整个模板都写活了 如果改变了路径只需要在扩展变量那里去修改即可。那么这个功能的作用就是这样的。
本教程由 帝通科技原创，转账请注明出处： http://www.ddv.cn/?zpl
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