Chris M.

I’ve updated the gist to fix that bug: https://gist.github.com/1215001

Hmm… here’s a gist of the plugin I’m using to test my code, since the forums don’t handle large blocks of code very well.

https://gist.github.com/1215001

That’s the issue—the domain mapping plugin doesn’t treat domains in a case insensitive way. If you look at the function domain_mapping_siteurl() (lines 529 and 536) you can see that it simply pulls the domain from the database as is, and in dm_domains_admin() it inserts the domain directly as it is sent from $_POST (lines 163 and 166). So if I enter “MyDomain.com” on the domain mapping admin page, it gets saved in the database as “MyDomain.com” — not “mydomain.com”. Finally, if you look at redirect_to_mapped_domain() (line 707), you’ll see that it simply checks if the domain in the database matches the domain in the $current_blog global variable. $current_blog->domain should always be lower case, but domain_mapping_siteurl() does not always return a lower case domain, so that check will always return false if the domain is not entered as all lower case in the admin panel.

A better fix might be changing the dm_domains_admin() function so that it performs strtolower() on $_POST['domain'] before inserting it into the database.