The plugin works, but returned the following errors on the results page:
Warning: Missing argument 2 for wpdb::prepare(), called in /home/macdnet/public_html/wp-content/plugins/multisite-global-search/inc/shortcodes.php on line 223 and defined in /home/macdnet/public_html/wp-includes/wp-db.php on line 1210
It also broke the layout of one of my widgets (but not the plugin widget, ironically.)
Search results page definitely needs some customization before going live, but I think the plugin will be useful.
It certainly gives you a search over multiple WordPress sites and is probably the easiest way to do this, but it's missing some key features such as controlling which sites it searches (the default is all), pagination of results and customising the search form and search results.
In excerpt mode it also doesn't strip HTML out, so you can end up with an opening of an HTML tag in your search results, but if the close if not part of the excerpt your search results screw up.
All of this means that whilst there's the potential to have a truly great plugin here (and boy do we NEED a good solution for multisite search - it's appalling that it doesn't exist as part of the core WordPress if you ask me), at the minute it's not quite there.
However if you can put up with its flaws, or are prepared to do some hacking of the plugin code, this could be idea for you.
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