How to use include_once in php with subdomains

Hello folks I have a file in http://mydomain.com/user/classes/check.class.php and would like it to be used in https://subdomain.mydomain.com using include_once How can I achieve this?
Genesis5150Asked:
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Dave BaldwinFixer of ProblemsCommented:
Just use the root-relative version of the path and filename.
include_once "/user/classes/check.class.php";

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Julian HansenCommented:
The include function doesn't know about domains or sub-domains. If your sub-domain is hosted on different server say then include won't work (unless the PHP setting allow_url_include is enabled - which it shouldn't be).

So, assuming they are on the same server then as Dave pointed out using a local path to the file will allow you to include that file.
Folder structure
Websites
      Main Domain
            Classes
                  check.class.php
      Sub Domain
            index.php

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Then in index.php the relative path
include_once(../Main Domain/Classes/check.class.php');

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Or the absolute path
include_once('/Websites/Main Domain/Classes/check.class.php');

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Ray PaseurCommented:
Sidebar note:  You may also want to know about this function:
http://php.net/manual/en/function.getcwd.php

And if you want to write your code in a way that allows for cross-platform functionality, consider using the context-aware predefined constant: DIRECTORY_SEPARATOR
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Ray PaseurCommented:
I don't know about the soon-to-be-extinct list.  My use of PHP goes back to 1999, so I encountered PHP on Windows 98, 2000, XP, ME, etc.  I have encountered the '/' problem in the past, when building a church web site circa 2000, and that was when I started using the constant.  Never looked back.
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Ray PaseurCommented:
I can't remember the exact timeline.  I changed to DIRECTORY_SEPARATOR long ago because the '/' did not work as desired on Windows hosting.   I can't really say when Microsoft made a change because DIRECTORY_SEPARATOR has worked perfectly from day one, and I never had any reason to change back.  IIRC, this was in the days of PHP4, but it's been a long time.

This page has some copyright information that seems to point to 2004, since PHP 4.0.6.  So I guess Microsoft changed behaviors some time after that.
https://pear.php.net/reference/PHP_Compat-latest/PHP_Compat/_PHP_Compat-1.6.0a3---Compat---Constant---DIRECTORY_SEPARATOR.php.html
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