php中关于路径的函数
1，string realpath ( string $path )Returns canonicalized absolute pathname（返回标准化绝对路径）
//will out put e:\MyWork\oDesk\canlendar\calendar_dev\calendar_dev\test
echorealpath ( '.' )
//will out put E:\MyWork\oDesk\canlendar\calendar_dev\calendar_dev\
echorealpath('../');
//will out put E:\MyWork\oDesk\canlendar\calendar_dev\calendar_dev\res
echo realpath('../res');
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