defined的用法
if (!defined('IN_CB')) { die('不允许访问此页.'); }
请问这句是什么意思呢，我知道define，但是不知道defined，
回复讨论(解决方案)
http://php.net/manual/zh/function.defined.php
嗯，谢谢，我明白了，我是在一个开源的程序里看看到的，这个我学到了，如果一个页面不想被其他人直接访问，那么就用这个函数，这个好使~
if (!defined('IN_CB')) { die('不允许访问此页.'); }
如果这个常量不存在就不执行下面的，并且抛出“不允许访问此页”
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