Making a plugin or theme work on multisite with shared global database tables
Use $wpdb->base_prefix everywhere instead of $wpdb->prefix
$wpdb->prefix and $wpdb->base_prefix
Shared database tables or individual tables per individual sub-site
Single Site
$wpdb->prefix and $wpdb->base_prefix are identical on a standard WordPress install
Multisite Subsite:
$wpdb->prefix – if you want seperate tables that belong to individual sub sites.
$wpdb->base_prefix – if you want table shared by all the sub sites (site 1, site 2, etc) (Multisite global).
USEFUL?
We benefit hugely from resources on the web so we decided we should try and give back some of our knowledge and resources to the community by opening up many of our company’s internal notes and libraries through resources like this. We hope you find it helpful.
Please feel free to comment if you can add help to this page or point out issues and solutions you have found, but please note that we do not provide support here. If you need help with a problem please use one of the many online forums.