CHALLENGE: WordPress multisite root url should redirect to a subsite
SOLUTION: add a wp action and wp_safe_redirect()
Multisite WordPress setup allows to create a multilanguage website. You can set up CMS to have a language version path as a subdirectory, ex: mysite.com/de/ , mysite.com/en/ . But what will happen when trying to access a root site url mysite.com? The main blog multisite homepage will be displayed. We can use the main site as a default landing page / language switcher, or even use it as a separate language version. Another solution will be to redirect every request from the main blog → to the homepage of the sub-site.
Redirect from the main blog
Our multisite uses sub-directories configuration. Every language sub-blog uses 2 letter code as a root path. We decided to redirect traffic from the main blog to the EN version (blog_id = 2). That way, if somebody types a url of a raw domain, he will be redirected to the sub-blog.
// functions.php
// redirection for: mysite.com → mysite.com/en/
function redirect_from_main_blog()
{
$blog_id = get_current_blog_id();
if (is_home() || is_404()):
if ($blog_id == 1 && !is_admin() && !defined('WP_CLI')) {
$url = get_home_url(2); //redirect to EN site from base url
echo $url;
wp_safe_redirect($url, 301);
exit;
}
endif;
}
add_action('wp', 'redirect_from_main_blog');Request Params conflicts
Sometimes the main site root url is used by external integrations, like the Pardot Form. On form submission, the site redirects to the main url with response params added to the request. If wp_safe_redirect() is executed, we will lose data from the response. The solution will be to check if param is set and add a code exception.
function redirect_from_main_blog() {
$blog_id = get_current_blog_id();
if(isset($_POST['ct_success_url'])){
// pardot success redirection fix (HTTP_REFERER)
return false;
}
if(isset($_GET['errorMessage'])){
// pardot errorMsg redirection fix
return false;
}
(...)
}That’s it for today’s tutorial. Make sure to follow us for more useful tips and guidelines.
How do I redirect to the subdirectory when logging in to the main website, only those that have a subsite obviously?
Hello,
simple example of redirecting user on login:
// Add to your theme’s functions.php file or a site-specific plugin
If you would like to detect user subsites:
function get_user_subsites($user_id) { $user_subsites = array(); // Get all sites in the network $sites = get_sites(); foreach ($sites as $site) { // Switch to each site context switch_to_blog($site->blog_id); // Check if the user is a member of the current site if (is_user_member_of_blog($user_id)) { // Optionally, store more detailed information about the site $user_subsites[] = array( 'blog_id' => $site->blog_id, 'siteurl' => get_site_url(), ); } // Restore original site context restore_current_blog(); } return $user_subsites; } // Usage example (replace 'user_id' with the actual user ID you're checking) $user_id = 1; // Example user ID $user_subsites = get_user_subsites($user_id);