在Windows操作系统中包含文件时，PHP获取绝对路径

Question

How do I get absolute path when including a file on Windows.

I tried follow methods:

require_once $_SERVER['DOCUMENT_ROOT']. '../module/account.php';
require_once realpath(dirname(__FILE__)) . '../module/account.php';
require_once __DIR__. '../module/account.php';

and all returned this error:

Warning: require_once(E:\Websites\Xampp\htdocs\protected\views../module/account.php): failed to open stream: No such file or directory in E:\Websites\Xampp\htdocs\minetendo\protected\views\index.php on line 20

Fatal error: require_once(): Failed opening required 'E:\Websites\Xampp\htdocs\protected\views../module/account.php' (include_path='.;E:\Websites\Xampp\php\PEAR') in E:\Websites\Xampp\htdocs\protected\views\index.php on line 20

I see tha path here is incorrect E:\Websites\Xampp\htdocs\protected\views../module/account.php

But I'm only coding using Windows Operating system. Website will be published on Linux environment.

What can I do to fix this?

Thanks in advance.