获取磁盘 PHP 的根 url

Question

How can I get the root of the disk on my server? Like for example in windows I would like to get into the root of the drive C:/ but I want my code to be dynamic if we ever decide to use linux.

I have tried $_SERVER['DOCUMENT_ROOT'] but it only returns the root folder of the project.

Is there any way to do this in PHP?

Answer 1

You don't need to manually construct that / worry about it.

A better approach is to have a constant in your project that marks the path to it from the root.

To do this you can do something like

define('PROJECT_ROOT', __DIR__);

See more about __DIR__ here: https://www.php.net/manual/en/language.constants.predefined.php

Basically this takes care of the OS context for you so if your project is on windows it'll be C:\... and on Linux based systems just /...