The following should work as long as all blogs reside in the same database.
First, choose the “primary” blog that will maintain the user-related tables. This is specifically for the table prefix info, which we’ll assume is “wp_”. From there, edit the wp-settings.php file for each secondary blog, changing the following two lines in the Table names section:
$wpdb->users = $table_prefix . 'users';
$wpdb->usermeta = $table_prefix . 'usermeta';
to
$wpdb->users = 'wp_users';
$wpdb->usermeta = 'wp_usermeta';
Again, we’re assuming “wp_” for the primary blog’s table prefix. That should be all you need to do. Source hacking note: Back up the files you are editing, and comment your changes for future reference (especially for upgrades to WordPress).
Turns out there may be a more maintainable method for this. I just looked over wp-settings.php under WordPress 2.0.2, and found these PHP constants are checked for:
CUSTOM_USER_TABLE
CUSTOM_USER_META_TABLE
So instead of the above changes to wp-settings.php, try adding the following to each secondary blog’s wp-config.php (before the include of wp-settings.php):
define ('CUSTOM_USER_TABLE', 'wp_users');
define ('CUSTOM_USER_META_TABLE', 'wp_usermeta');
i have tried both of these edits but with no luck. after doing these edits i was unable to access to blog’s main page, and also unable to login using both the password given to me on the new install and the the one from the orginal install. It tells me I do not have permission to access this page (wp-login). HELP???
