关于文件路径
文件的路径有相对路径和绝对路径。但有些文章有时让我感到困惑：
/a/b/c.php //relative document root
./a/b/c.php //what does this mean? equals to '/a/b/c.php' or a/b/c.php?
a/b/c.php //relative to current directory
../a/b/c.php //parent folder relative to current directory
/../a/b/c.php //what does this mean? parent folder of document root?
还有其他写法吗？
谢谢。
There are relative path and absolute path of the a file. But some of the writings confuse me sometimes:
/a/b/c.php //relative document root
./a/b/c.php //what does this mean? equals to '/a/b/c.php' or a/b/c.php?
a/b/c.php //relative to current directory
../a/b/c.php //parent folder relative to current directory
/../a/b/c.php //what does this mean? parent folder of document root?
Are there other ways of writing this?
Thank you.
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这里有一些基本的目录符号：
.（点）是当前目录..（双点）是当前目录的父目录~（波形符）是您的主目录。/（斜杠）如果它出现在第一个字符，通常称为根目录。这些都来自linux/unix术语（这里是CMIIW）。
现在，让我们看一下实现：
/home/username/上./wwwroot/somedir/=>/home/用户名/wwwroot/somedir/../wwwroot/somedir/=>/home/wwwroot/somedir//../wwwroot/somedir/=>/wwwroot/somedir您可能会对示例 #3 感到困惑。如果在路径信息前面加上
/，则表示您位于根目录。因此，如果你写/../somedir/则意味着你指向 /somedir/。为什么？因为根目录没有父目录。Here's some basic directory symbol for you:
.(dot) is your current directory..(double-dot) is the parent of your current directory~(tilde) is your home directory./(slash) if it present at first character, it usually is called root directory.These all came from linux / unix terminology (CMIIW here).
Now, let's take a look at the implementation:
/home/username/./wwwroot/somedir/=>/home/username/wwwroot/somedir/../wwwroot/somedir/=>/home/wwwroot/somedir//../wwwroot/somedir/=>/wwwroot/somedirYou might get confused on example #3. If you put
/in front of path info, it mean you are at the root directory. Therefore, if you write/../somedir/it mean, you are pointing to /somedir/. Why? because root directory doesn't have parent.。 = 当前目录。因此
./a/b/c.php相当于a/b/c.php。/../a/b/c.php表示先到根目录，然后上一层，再到目录a，再到目录b，然后是c.php。. = current directory. So
./a/b/c.phpwould be equivalent toa/b/c.php./../a/b/c.phpmeans go to the root directory, then up one, then directorya, then directoryb, thenc.php.