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Asked: 2026-05-22T16:56:47+00:00

Basically, I have a class Avian that contains logic for some basic things such

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Basically, I have a class Avian that contains logic for some basic things such as:

  1. Connecting to MySQL
  2. Checking login status
  3. Displaying the navigation bar

These files are stored in “projectavian” which is a folder within my host’s root directory and is the folder for all files that will display on mydomain.com.

I’ve gone and set up a few subdomains such as dev.mydomain.com. My host creates folders for subdomains in the root directory alongside the “projectavian” folder. The furthest back that I seem to be able to go from within a HTML/PHP page in “projectavian” or the folder for my subdomain is up to this folder only (ie I can’t actually access the root by going "/subdomain_folder" or adding as many "../"s as I want.

All I need to do is use include or require to get my PHP class from mydomain.com on a page that’s at dev.mydomain.com. Obviously you can’t do include "http://somedomain.com/file.php". Is there maybe a PHP function that can access the server root directory?

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1 Answer

  1. Editorial Team

    You can use magic constants combined with dirname like this:

    $root = dirname(dirname(__FILE__));

    which lets you access your root directory and from there you can do something like:

    $path = $root . '/subdomain_folder/' . $filename;

    check out these references for both dirname and the magic constant

    http://php.net/manual/en/function.dirname.php

    http://php.net/manual/en/language.constants.predefined.php

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