Ticket #16802: 16802.2.patch

query.php

@@ -3632 +3632 @@
          *
          * @since 3.1.0
          *
-         * @param mixed $page Page ID, title, slug, or array of such.
+         * @param mixed $page Page ID, title, slug, path, or array of such.
          * @return bool
          */
         function is_page( $page = '' ) {
@@ -3652 +3652 @@
                         return true;
                 else if ( in_array( $page_obj->post_name, $page ) )
                         return true;
+                else {
+                        foreach ( $page as $index => $pagepath ) {
+                                $pagepath_page_obj = get_page_by_path( $pagepath );
+                                
+                                if ( ( $pagepath_page_obj = get_page_by_path( $pagepath ) ) && $pagepath_page_obj->ID == $page_obj->ID )
+                                        return true;
+                        }
+                }
 
                 return false;
         }