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这里如何理解呢

WBOY
Release： 2016-06-23 13:44:21
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这是discuz中的一段代码，为了是判断php的版本号，我不理解的是，即然版本号都定为一个5.4.0RC6字符串了，哪来的比较呢，就好比，adafasdf这个字段串和wdsfa这个字符串比大小，这不是不伦不类吗，这里面的道理何在？


回复讨论(解决方案)

PHP_VERSION 是预定义常量，不能被覆盖
难道你那里不报错吗？

PHP_VERSION 是预定义常量，不能被覆盖
难道你那里不报错吗？


你的覆盖指的是个啥

指重新定义 

define('PHP_VERSION', '6');
Copy after login
Notice: Constant PHP_VERSION already defined in ....

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