WPMU – Add ALL New Users to Main Site

In WordPress MU there are two levels of users. There are users who have a blog and users who do not have a blog. This option is usually chosen when the user creates their account. If they choose to have just a username only (no blog), then the user is added as a subscriber to the main site (default setting). If they chose to have a blog, WPMU adds a subsite for them with an administrator user for that subsite. However, it does not give them subscriber permissions to the main site.

This became an issue with a site I was working on recently. The main site had a calendar that any logged in user needed to be able to add an event to. To do this I had to create a custom group that allowed users to post in a specific category only, which worked great, except for blog users. Since blog users are not given any rights on the main blog, I needed to find a way to automatically create the same functionality that normal users have on the main site.

This is what I came up with:

function ft_new_user_meta($blog_id, $user_id) {
add_user_to_blog('1', $user_id, 'calendar' );
add_action( 'wpmu_new_blog', 'ft_new_user_meta', 10, 2 );

Basically, I hook onto the wpmu_new_blog function, so whenever it is called, it calls my ft_new_user_meta function. Which passes in the two variables $blog_id and $user_id. Then I run the function, add_user_to_blog with 1 as the blog_id for the main site, the $user_id that I’m adding, and the role that I want to give. In this case it is my custom “calendar” role.

I added that into a file named new_user.php which I placed in the mu-plugins directory. Now, whenever a user goes to the site and creates their own blog, it gives them access to the main site with rights to add events to the calendar.

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