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I have a problem in following situation:

I have 2 separate Wordpress 3.3.1 instances, main at domain.com and one of them (which consists of simple Q&A type site) is available from subdomain forum.domain.com. Now I have to merge them into one instance - to be able to share plugins, theme and posts (<-- that's important).

At this moment, forum.domain.com points to that second instance. I can quite easily get rid of it just by creating post categories for questions and displaying them accordingly. But then, my questions will have links like domain.com/category/forum/question-subcategory/question and I want them to be like forum.domain.com/question-subcategory/question. I've seen that there is a WP Subdomains plug-in that does exactly that but it's not compatible with WP 3.3.1. I thought that should be possible with .htaccess rules but this post seems to explain that it's not.

I considered using WP Multi-site feature but as far as I know, separate sites have separate tables in DB, thus they can't share posts (which is needed, as previously said).

Does anybody have any clue how to fix this problem ?

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Can't vote up but really interested in replies to this! - Thanks –  user15070 Apr 11 '12 at 10:10
    
Sites in a multisite instance can interact with eachother. Refer to these functions: get_current_blog_id(), switch_to_blog() and restore_current_blog() –  Tom J Nowell Apr 11 '12 at 10:49
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1 Answer

Well, thanks for hints but finally, I had to abandon the idea of subdomain due to lack of working solution for this. I made separate categories for questions and used some hooks to display&operate on them properly. Thanks to the Custom Permalinks plugin, I now have domain.com (main blog) and domain.com/forum/ (Q&A), and the latter seems to be different site - with different headers, sidebars, logic, etc. from user's point of view (it's all on one instance, of course).

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