PHP如何设置动态文件夹路径

Question

我想为文件夹设置动态路径，例如，如果用户使用ubuntu，则路径将设置为ubuntu目录(var/www/)；如果用户使用Windows系统，则将根路径设置为窗口的文件夹，例如(xampp/htdocs/project)

Answer 1

<?php 
echo $_SERVER['DOCUMENT_ROOT']; // This  to get root working directory

echo $abs = $_SERVER['DOCUMENT_ROOT'] . '/project_directory/'; 
// This is to add your current working directory folder to  root directory
?>