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这个常量怎么理解

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Release： 2016-06-13 11:44:50
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这个常量如何理解
define('DISCUZ_ROOT', substr(dirname(__FILE__), 0, -12));

这个常量定义看不明白，怎么有四个参数呢，都各是代表啥的。

Related labels：
dirname discuz file nbsp substr
source：php.cn
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