你应该使用原生常量 DIRECTORY_SEPARATOR 而不是自己输入(反)斜杠，这样你的代码就可以在任何平台上运行.

You should be using the native constant DIRECTORY_SEPARATOR instead of entering the (back)slash yourself, this way your code will work on any platform.

$path = '.'.DIRECTORY_SEPARATOR.'mydir'.DIRECTORY_SEPARATOR.'myfile';

另外，windows 支持反斜杠和正斜杠，所以你可以简单地在任何地方使用正斜杠.

Also, windows support both back and forward slashes, so you can simply uses forward slashes everywhere.

例如这两个都适用于窗口:

eg both of these work on window:

$path = './mydir/myfile';
$path = '.\mydir\myfile';