Ticket #40201: 40201.3.patch

src/wp-includes/ms-blogs.php

@@ -445 +445 @@
  *
  * @global bool $_wp_suspend_cache_invalidation
  *
- * @param WP_Site $blog The site object to be cleared from cache.
+ * @param WP_Site|int $blog The site object to be cleared from cache.
+ * @return bool True if caches clear succeeds, false otherwise.
  */
 function clean_blog_cache( $blog ) {
         global $_wp_suspend_cache_invalidation;
@@ -454 +455 @@
                 return;
         }
 
+        if ( is_object( $blog ) || is_int( $blog ) ) {
+                $blog = get_site( $blog );
+        }
+
+        if ( ! ( $blog instanceof WP_Site ) ) {
+                return false;
+        }
+
         $blog_id = $blog->blog_id;
         $domain_path_key = md5( $blog->domain . $blog->path );
 
@@ -478 +487 @@
         do_action( 'clean_site_cache', $blog_id, $blog, $domain_path_key );
 
         wp_cache_set( 'last_changed', microtime(), 'sites' );
+
+        return true;
 }
 
 /**