经过搜集资料和多次测试发现，在其他web编程语言中相对路径都是以当前处理文件目录为基准，而在php中并非如此。php中相对路径是以当前工作目录为基准的，并非以当前处理文件目录为基准，这样在开发过程中带来了不少的麻烦。
用include或requice包含文件时，文件路径前都加上dirname(__file__)。例如：现有a.php、b.php、c.php、d.php4个文件，他们关系为：
b.php(与根目录同一级)
根目录/a.php
根目录/c.php
根目录/dir/d.php
现在a.php中要包含b.php、c.php。写法如下：
include_once(dirname(__file__)."/../b.php");
include_once(dirname(__file__)."/c.php");
?> 如果c.php中要包含d.php。写法如下：
include_once(dirname(__file__)."/dir/d.php");
?> 此方式在目前来说是解决路径错位最有效的方法
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