我有一个关于 PHP 包含路径的问题，它在两个环境中的行为不同。
文件夹结构：
视窗
|-C:\wamp\www\cms\themes\child
|-C:\wamp\www\cms\themes\parent
Linux
|-/var/www/html/cms/themes/child
|-/var/www/html/cms/themes/parent
Linux 环境
var_dump(realpath('/')); // means /
var_dump(realpath('/../parent/scripts/import.php')); //boolean false
include('/../parent/scripts/import.php'); //it will not work
include('../parent/scripts/import.php'); //it will not work, except it will reference parent folder
视窗环境
var_dump(realpath('/')); //C:\
var_dump(realpath('/../parent/scripts/import.php')); //boolean false
include('../parent/scripts/import.php'); //am thinking it will work at first, but it does not work in windows (feel weird)
include('/../parent/scripts/import.php'); //it work in windows (feel weird)
我知道最好的做法是，它适用于两个平台
include(realpath(dirname(__FILE__)).'/../parent/scripts/import.php');
但我想知道这一点，它是 PHP 错误还是什么原因造成的？