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Get Main Site URL in WordPress Multisite Network
* Get the home URL of the main site in a multisite network.
* @return string The home URL of the main site.
function km_get_main_site_url() {
// This is the current network's information; 'site' is old terminology.
global $current_site;
if ( is_multisite() && $current_site ) {
$main_site_blog_id = $current_site->blog_id;
return get_home_url( $main_site_blog_id );
return home_url();
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