这么做是为什么,帮忙看看好么 -
这样做是为什么,帮忙看看好么 - -
defined ( 'IN' ) or die ( 'Access Denied' );
这句话。在前台控制器文件都有,但是为什么要这么做,他在index.php文件定义了这个常量,然后来检查他是否被定义,但是前台控制器本来就是用来访问的,为什么要加这个定义啊。不是根本没有用吗?
------解决方案--------------------
如果IN没有定义,则退出执行,并输出Access Denied
作用是当IN没有定义时,不执行后面的程序。
这样就会输出ok
define('IN', 123);
defined ( 'IN' ) or die ( 'Access Denied' );
echo 'ok';
如果define('IN', 123);这句不存在,就输出AccessDenied
------解决方案--------------------
这样做目的是控制入口,你的程序应该是只能用index.php?controller=xxx&action=xxx 形式访问的吧。
如果用户直接访问 controller.php 要被禁止。所以加了这段判断。
例如你的目录结构
app/controller/c.php
index.php
define('IN','xxx'); 这句在index.php定义
如果用户直接访问 index.php?controller=c 会执行 app/controller/c.php 因为IN有定义了,所以可以执行。
但用户直接访问app/controller/c.php 因为IN没有定义,所以不能执行。
------解决方案--------------------
凡是有这句的程序文件,都不能直接访问到
而只能在 index.php 中包含

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