Multiple installs can share a single database, as long as each install has a unique table prefix defined in wp-config.php before going through the install process: /** * WordPress Database Table prefix. * * You can have multiple installations in one database if you give each a unique * prefix. Only numbers, letters, and underscores … Read more
Instead of get_option, use home_url which will determine … the appropriate protocol, “https” if is_ssl() and “http” otherwise. If the $scheme argument is “http” or “https” the is_ssl() check is overridden. In fact, network_home_url would be more appropriate since you are talking about Multisite. Those should return the same value that you are trying the … Read more
It appears your sites are not under the same network, and you have network 1 and network 3. Normally this would never happen on an average multisite unless plugins are installed that can change this. Yes 1 WordPress multisite instance can run multiple networks of blogs, you have accidentally stumbled onto this feature, wordpress.com being … Read more
You could hook intop pre_comment_on_post: add_action( ‘pre_comment_on_post’, function(){ if ( empty ( $_SERVER[‘HTTP_REFERER’] ) ) exit; }); But … be aware, not all requests without an referer are actually spam posts. Some firewalls and proxies strip this field. And most automated spam comes with a Referer field filled with the name of the spammed domain. … Read more
If you have a network, you don’t need multiple installs. I would just start researching networks more via the codex. http://codex.wordpress.org/Create_A_Network
To remove the Add Users capability from Administrators (but leave it intact for Super Administrators), you can do this: <?php $role = get_role( ‘administrator’ ); if ( $role->capabilities[‘add_user’] == 1 && ! is_main_site( get_current_blog_id() ) ) { // Because this is saved to the database, we check first // to see if it’s already been … Read more
The signup page has validation hooks. How about something like this? add_filter(‘wpmu_validate_blog_signup’,’set_blog_creation_limit’); function set_blog_creation_limit($result) { $blogs = get_blogs_of_user($result[‘user’]->ID); if (count($blogs) > 2 ) $result[‘errors’]->add(‘blogname’, __(‘You have already registered the maximum amount of blogs!’)); return $result; }
Every front end page request on a WordPress site produces a main query. The template that WordPress decides to load is based on the results of that main query (you can see the order that WordPress does these things by looking at the Action Reference page). Despite the fact that you never output the results … Read more
I understand that your question is about to establish a default role for a site, such as ‘contributor’ or ‘author’, but also when the site does not exists yet. I found a code snippet that changes the role when the user creates a blog: function user_role_to_new_blog($blog_id, $user_id) { add_user_to_blog($blog_id, $user_id, ‘author’ ); } add_action( ‘wpmu_new_blog’, … Read more
No real difference either way, really. Network installs make the most sense when you want all the sites to share a single set of users. But the basic table handling is pretty much the same either way.