編輯“WordPress:WPMU Site Wide Categories”

'''Note:''' Site wide tagging is introduced in WPMU version 1.3, so this approach might be considered obsolete.

This solution uses a separate standard single-user wordpress install to read the sitewide feed plugin from MU.

Then using a category plugin, it makes tags.

Please help evolve this documentation

This documentation was gleamed from the thread at http://mu.wordpress.org/forums/topic.php?id=3247&replies=68 : I refactored it here to allow the instructions to evolve without incurring extra complexity.

# On your *wpmu install*, download and install the wpmu-sitewide-feed plugin, and get it working.
## http://www.itdamager.com/plugins/wpmu-sitewide-feed/
# Install a copy of Single User Wordpress somewhere handy. Dr. Mike put his in http://daria.be/tags
## As an aside, make sure you have this name blocked out from your WPMu install or otherwise you're going to have issues.
# Go through your Single User Wordpress install that you have setup for the tags and make the following changes:
## On Admin->Options->General
### uncheck 'Anyone can register' is unchecked
## On Admin->Options->Reading:
### change the Syndication Feeds to Summary (Optional but suggested)
### Bump up the Show the Most Recent: to something like  25. (Again optional but what the hey)
## On Admin->Options->Privacy 
### Change Blog Visibility to 'I would like to block search engines, but allow normal visitors'
### '''VERY IMPORTANT'''! This way you're not sending out pings to the posts you're importing. Did I say how important it was to turn off those options?
## On Admin->Options->Discussion 
### '''VERY IMPORTANT'''! Turn off the first three options under 'Usual settings for an article':
### Turn off "Attempt to notify any Weblogs linked to from the article (slows down posting.)"
### Turn off "Allow link notifications from other Weblogs (pingbacks and trackbacks.)"
### Turn off "Allow people to post comments on the article"
### Turn on "Before a comment appears:An administrator must always approve the comment" (your install is not for original comment 
## On Admin->Options->Permalinks
### Change Permalinks to 'Date and name based'
# On the Single User Wordpress
## Download and enable the tag-replace-post-link.php plugin: http://heftagaub.wordpress.com/2007/03/17/sitewide-tags-for-wpmu-without-core-changes/
# On WPMU, Admin->SiteAdmin->Sitefeed
## Change Trigger Blog Id to such a high number that it does not refer to an active blog. Say 1000. (You will change it back after the first import.)
# Download the reworked WP-Autoblog - http://wpmudev.org/project/wp-autoblog is a copy uploaded by someone. 
## No sign of the version by Dr. Mike, "that I'm going to stick up over in http://wpmudev.org once I get this finished." (http://daria.be/tags/wp-autoblog.phps is a 404 Not Found.)
# Install the wp-autoblog plugin 
# Activate the wp-autoblog plugin 
# Make sure you did remember to stop the pings as above. (Admin->Options->Discussion, above)
# On your tag system install, go Dashboard -> Options -> WP Autoblog
## Enter the URL of your WPMuFeed into the basic settings box on the left. I also have chosen the Excerpt and give them credit options.
# Double check the pings are in fact turned off. :)
# On the Single User Wordpress, Options->WP AutoBlog, Run Script Now. It should import all the posts from MU into the single user worpress. 
# On WPMU, Admin->SiteAdmin->Sitefeed
## Change Trigger Blog Id back to the normal number.

The changes to use the tag-replace-post-link.php plugin (or alternatively, hacks to link-template.php) allows the tag system to load the URL of the individual blog as the permalink instead of what it normally does.


Later:
http://mu.wordpress.org/forums/topic.php?id=3247&replies=68
http://heftagaub.wordpress.com/2007/03/17/sitewide-tags-for-wpmu-without-core-changes/