Why can’t a WordPress network (multisite) in it’s own folder use subdomains?

I figured it out. The fact is, a network can use subdomains or subfolders, even when WordPress is installed in it’s own folder as long as the main site’s HOME URL is set to domain.com and not to the sub folder location.

Here’s an example:

I setup a clean install of WordPress using Mark Jaquith’s WordPress Skeleton which places WordPress’s core files at domain.com/wp/. However, when trying to run the initial install script, WordPress chokes on its own redirects. (It keeps trying to load domain.com/wp-admin/install.php instead of domain.com/wp/wp-admin/install.php. Maybe a bug report for another day?)

To get around that, I manually typed in the correct path to the install script (domain.com/wp/wp-admin/network.php). By doing this, WordPress sets the HOME URL to domain.com/wp instead of just domain.com. (Which makes sense, really.)

By changing the site’s HOME URL to domain.com, I am now able to choose a subdomain or subfolder installation when setting up the multisite.

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