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为啥不能输出反斜杠

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Release： 2016-06-13 12:17:50
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为什么不能输出反斜杠？
 define('__DIR__', dirname(__FILE__)."\\");
 echo __DIR__;


------解决思路----------------------
__DIR__ 是魔术常量，能被你定义

__DIR__ 文件所在的目录。如果用在被包括文件中，则返回被包括的文件所在的目录。它等价于 dirname(__FILE__)。除非是根目录，否则目录中名不包括末尾的斜杠。（PHP 5.3.0中新增）

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define dir dirname file nbsp
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