I wrote a plugin that allows people to Join A Multisite on a Per-Site Basis.
There are some things it doesn’t do that I have no intention of adding into the plugin, but people often ask me how to do them. Personally, I think people should always know they’re on a network, and hiding this will only lead to complaints later one, but my way is not the only way.
That said. I am aware of things people try to do that my plugin won’t. All of these snippets should go in a file in mu-plugins. I’d name it multisite-registration.php personally. That way I know what it is right away.
Emails By Site
When you register for a network site, you always get emailed from the network. This means even if I go to halfelf.org to reset my password, the email always comes from ipstenu.org. To change the password reset emails to be from the one where you’ve actually pressed the reset link is pretty easy:
add_filter( 'retrieve_password_message', function ($message, $key) {
return str_replace(get_site_url(1), get_site_url(), $message);
}, 10, 2);
add_filter( 'retrieve_password_title', function($title) {
return "[" . wp_specialchars_decode(get_option('blogname'), ENT_QUOTES) . "] Password Reset";
});
But when we talk about the activation it’s a little messier. If you’re using my plugin, you can have users sign up on a specific site. You probably want to have new user activations come from that site and if you do, you need to do this:
add_filter( 'wpmu_signup_blog_notification_subject', function($subject) {
return "[" . wp_specialchars_decode(get_option('blogname'), ENT_QUOTES) . "] Activate Your Account";
});
add_filter( 'wpmu_signup_blog_notification_subject', function($subject) {
return "[" . wp_specialchars_decode(get_option('blogname'), ENT_QUOTES) . "] Activate Your Account";
});
That subject can, obviously, be changed.
Redirect Lost Password Pages
So you may have noticed that the lost password page on a network always points to the network and never the site you’re on.
That can actually be fixed by doing this:
add_filter( 'lostpassword_url', function ($url, $redirect) {
$args = array( 'action' => 'lostpassword' );
if ( !empty($redirect) )
$args['redirect_to'] = $redirect;
return add_query_arg( $args, site_url('wp-login.php') );
}, 10, 2);
add_filter( 'network_site_url', function($url, $path, $scheme) {
if (stripos($url, "action=lostpassword") !== false)
return site_url('wp-login.php?action=lostpassword', $scheme);
if (stripos($url, "action=resetpass") !== false)
return site_url('wp-login.php?action=resetpass', $scheme);
return $url;
}, 10, 3 );
This simply filters the URL and if you’re on a site’s login page, use that site for the URL.
Redirect Logins to Their Site
This one is messier. If you always want a user to be redirected to ‘their’ site, you have to know what their primary blog is on the network. You can do this, and for the most part, this works:
add_filter('login_redirect', function ( $redirect_to, $request_redirect_to, $user ) {
if ($user->ID != 0) {
$user_info = get_userdata($user->ID);
if ($user_info->primary_blog) {
$primary_url = get_blogaddress_by_id($user_info->primary_blog) . 'wp-admin/';
if ($primary_url) {
wp_redirect($primary_url);
die();
}
}
}
return $redirect_to;
}, 100, 3);
If they don’t have a primary_blog, they’ll be punted to the main for the network, as it should be.
