如题？这么设计是出于什么样的考虑？
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如题？这么设计是出于什么样的考虑？
DRY 原则。
就相当于我们进入一栋大楼，如果是单一入口的话，就需要一个门卫。2个入口，则需要2个。
对于 HTTP 请求来说，每次的请求模式都一样：分析 URL --> 取得 query 数据 ---> 取得 FORM 数据 ---> 过滤所有的输入以保证安全 ---> 权限判断 ---> ....
其中还有很多，比如加载数据库配置，网站配置，缓存，全局函数等。
这些通用的功能，可以放到一个 前端控制器 里面，前端控制器负责处理框架的逻辑，然后这个控制器根据用户的请求，将 业务逻辑 发送给相应的控制器。
处理url的路由咯，不然你访问了哪个文件是被指定了的，PHP没有像Spring之类的能去配置URL路由的地方
这个问题前段时间我也纠结了一下。
由于自己想学习下php框架，用了smarty。而smarty在每次调用界面模板时都需要用到smarty类。
也就是说每个php文件需要调用模板的时候都需要实例化smarty类，反复实例化我觉得有些无用功了，就想到用一个文件做入口，每次从这个入口进去做完所有的初始化工作，再根据地址所带参数来分配模板会更简单点。
单入口可以把所有配置，初始化的程序统一完成。这是我目前所发现的单入口的优点。
可以 phar 单文件上线
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