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php-PHP中require_once不同目录下引用文件出错

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Release： 2016-06-02 11:32:26
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引用phprequire once

目录结构是这样的：
1.php
3.php
文件夹2
2.php
1.php中require_once 2和3文件
2.php中又require_once 3.php
报错Fatal error: require_once(): Failed opening required '../3.php'
当2.php放置在与13同一目录下则不会出错
不懂这是怎么回事？

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引用 php require once
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