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defined的用法

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Release： 2016-06-23 14:18:33
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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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