Ticket #13793: patch_menu_child_of.patch

wp-includes/nav-menu-template.php

@@ -134 +134 @@
 
         $defaults = array( 'menu' => '', 'container' => 'div', 'container_class' => '', 'container_id' => '', 'menu_class' => 'menu', 'menu_id' => '',
         'echo' => true, 'fallback_cb' => 'wp_page_menu', 'before' => '', 'after' => '', 'link_before' => '', 'link_after' => '',
-        'depth' => 0, 'walker' => '', 'theme_location' => '' );
+        'depth' => 0, 'walker' => '', 'theme_location' => '', 'child_of'=>0 );
 
         $args = wp_parse_args( $args, $defaults );
         $args = apply_filters( 'wp_nav_menu_args', $args );
@@ -187 +187 @@
         // Set up the $menu_item variables
         _wp_menu_item_classes_by_context( $menu_items );
 
+        if($args->child_of) $menu_items = & _wp_nav_menu_item_children( $args->child_of, $menu_items );
+    
         $sorted_menu_items = array();
         foreach ( (array) $menu_items as $key => $menu_item )
                 $sorted_menu_items[$menu_item->menu_order] = $menu_item;
@@ -357 +359 @@
 }
 
 /**
+ * Retrieve child menu items from list of menus matching menu ID.
+ *
+ * Matches against the menus parameter against the page ID. Also matches all
+ * children for the same to retrieve all children of a menu. Does not make any
+ * SQL queries to get the children.
+ *
+ * @since 1.5.1
+ *
+ * @param int $menu_id Menu Item ID.
+ * @param array $items List of menu items' objects.
+ * @return array
+ */
+function &_wp_nav_menu_item_children($item_id, $items) {
+    
+    $item_list = array();
+    foreach ( (array) $items as $item ) {
+        if ( $item->menu_item_parent == $item_id ) {
+            $item_list[] = $item;
+            
+            $children = _wp_nav_menu_item_children($item->db_id, $items);
+            if ( $children ) {
+                $item_list = array_merge($item_list, $children);
+            }
+        }
+    }
+    
+    return $item_list;
+}
+
+/**
  * Retrieve the HTML list content for nav menu items.
  *
  * @uses Walker_Nav_Menu to create HTML list content.