Ticket #27866: 27866.2.diff

src/wp-includes/ms-settings.php

@@ -53 +53 @@
                         $current_site->blog_id = BLOGID_CURRENT_SITE;
                 }
 
-                if ( $current_site->domain === $domain && $current_site->path === $path ) {
+                if ( $current_site->domain === $domain && 0 === strcasecmp( $current_site->path, $path ) ) {
                         $current_blog = get_site_by_path( $domain, $path );
-                } elseif ( '/' !== $current_site->path && $current_site->domain === $domain && 0 === strpos( $path, $current_site->path ) ) {
+                } elseif ( '/' !== $current_site->path && $current_site->domain === $domain && 0 === stripos( $path, $current_site->path ) ) {
                         // If the current network has a path and also matches the domain and path of the request,
                         // we need to look for a site using the first path segment following the network's path.
                         $current_blog = get_site_by_path( $domain, $path, 1 + count( explode( '/', trim( $current_site->path, '/' ) ) ) );