function book_menu_subtree_data
book_menu_subtree_data($link)
Gets the data representing a subtree of the book hierarchy.
The root of the subtree will be the link passed as a parameter, so the returned tree will contain this item and all its descendents in the menu tree.
Parameters
$link: A fully loaded menu link.
Return value
A subtree of menu links in an array, in the order they should be rendered.
File
- modules/book/book.module, line 1380
- Allows users to create and organize related content in an outline.
Code
function book_menu_subtree_data($link) { $tree = &drupal_static(__FUNCTION__, array()); // Generate a cache ID (cid) specific for this $menu_name and $link. $cid = 'links:' . $link['menu_name'] . ':subtree-cid:' . $link['mlid']; if (!isset($tree[$cid])) { $cache = cache_get($cid, 'cache_menu'); if ($cache && isset($cache->data)) { // If the cache entry exists, it will just be the cid for the actual data. // This avoids duplication of large amounts of data. $cache = cache_get($cache->data, 'cache_menu'); if ($cache && isset($cache->data)) { $data = $cache->data; } } // If the subtree data was not in the cache, $data will be NULL. if (!isset($data)) { $query = db_select('menu_links', 'ml', array('fetch' => PDO::FETCH_ASSOC)); $query->join('menu_router', 'm', 'm.path = ml.router_path'); $query->join('book', 'b', 'ml.mlid = b.mlid'); $query->fields('b'); $query->fields('m', array('load_functions', 'to_arg_functions', 'access_callback', 'access_arguments', 'page_callback', 'page_arguments', 'delivery_callback', 'title', 'title_callback', 'title_arguments', 'type')); $query->fields('ml'); $query->condition('menu_name', $link['menu_name']); for ($i = 1; $i <= MENU_MAX_DEPTH && $link["p$i"]; ++$i) { $query->condition("p$i", $link["p$i"]); } for ($i = 1; $i <= MENU_MAX_DEPTH; ++$i) { $query->orderBy("p$i"); } $links = array(); foreach ($query->execute() as $item) { $links[] = $item; } $data['tree'] = menu_tree_data($links, array(), $link['depth']); $data['node_links'] = array(); menu_tree_collect_node_links($data['tree'], $data['node_links']); // Compute the real cid for book subtree data. $tree_cid = 'links:' . $item['menu_name'] . ':subtree-data:' . hash('sha256', serialize($data)); // Cache the data, if it is not already in the cache. if (!cache_get($tree_cid, 'cache_menu')) { cache_set($tree_cid, $data, 'cache_menu'); } // Cache the cid of the (shared) data using the menu and item-specific cid. cache_set($cid, $tree_cid, 'cache_menu'); } // Check access for the current user to each item in the tree. menu_tree_check_access($data['tree'], $data['node_links']); $tree[$cid] = $data['tree']; } return $tree[$cid]; }
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https://api.drupal.org/api/drupal/modules!book!book.module/function/book_menu_subtree_data/7.x