MenuTreeStorage::rebuild

public MenuTreeStorage::rebuild(array $definitions)

public function rebuild(array $definitions) {
  $links = array();
  $children = array();
  $top_links = array();
  // Fetch the list of existing menus, in case some are not longer populated
  // after the rebuild.
  $before_menus = $this->getMenuNames();
  if ($definitions) {
    foreach ($definitions as $id => $link) {
      // Flag this link as discovered, i.e. saved via rebuild().
      $link['discovered'] = 1;
      // Note: The parent we set here might be just stored in the {menu_tree}
      // table, so it will not end up in $top_links. Therefore the later loop
      // on the orphan links, will handle those cases.
      if (!empty($link['parent'])) {
        $children[$link['parent']][$id] = $id;
      }
      else {
        // A top level link - we need them to root our tree.
        $top_links[$id] = $id;
        $link['parent'] = '';
      }
      $links[$id] = $link;
    }
  }
  foreach ($top_links as $id) {
    $this->saveRecursive($id, $children, $links);
  }
  // Handle any children we didn't find starting from top-level links.
  foreach ($children as $orphan_links) {
    foreach ($orphan_links as $id) {
      // Check for a parent that is not loaded above since only internal links
      // are loaded above.
      $parent = $this->loadFull($links[$id]['parent']);
      // If there is a parent add it to the links to be used in
      // ::saveRecursive().
      if ($parent) {
        $links[$links[$id]['parent']] = $parent;
      }
      else {
        // Force it to the top level.
        $links[$id]['parent'] = '';
      }
      $this->saveRecursive($id, $children, $links);
    }
  }
  $result = $this->findNoLongerExistingLinks($definitions);

  // Remove all such items.
  if ($result) {
    $this->purgeMultiple($result);
  }
  $this->resetDefinitions();
  $affected_menus = $this->getMenuNames() + $before_menus;
  // Invalidate any cache tagged with any menu name.
  $cache_tags = Cache::buildTags('config:system.menu', $affected_menus, '.');
  $this->cacheTagsInvalidator->invalidateTags($cache_tags);
  $this->resetDefinitions();
  // Every item in the cache bin should have one of the menu cache tags but it
  // is not guaranteed, so invalidate everything in the bin.
  $this->menuCacheBackend->invalidateAll();
}