function menu_tree_page_data in Drupal 6

Same name and namespace in other branches

7 includes/menu.inc \menu_tree_page_data()

Get the data structure representing a named menu tree, based on the current page.

The tree order is maintained by storing each parent in an individual field, see http://drupal.org/node/141866 for more.

Parameters

$menu_name: The named menu links to return

Return value

An array of menu links, in the order they should be rendered. The array is a list of associative arrays -- these have two keys, link and below. link is a menu item, ready for theming as a link. Below represents the submenu below the link if there is one, and it is a subtree that has the same structure described for the top-level array.

File

includes/menu.inc, line 870: API for the Drupal menu system.

Code

function menu_tree_page_data($menu_name = 'navigation') {
  static $tree = array();

  // Load the menu item corresponding to the current page.
  if ($item = menu_get_item()) {

    // Generate a cache ID (cid) specific for this page.
    $cid = 'links:' . $menu_name . ':page-cid:' . $item['href'] . ':' . (int) $item['access'];
    if (!isset($tree[$cid])) {

      // If the static variable doesn't have the data, check {cache_menu}.
      $cache = cache_get($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 tree data was not in the cache, $data will be NULL.
      if (!isset($data)) {

        // Build and run the query, and build the tree.
        if ($item['access']) {

          // Check whether a menu link exists that corresponds to the current path.
          $args = array(
            $menu_name,
            $item['href'],
          );
          $placeholders = "'%s'";
          if (drupal_is_front_page()) {
            $args[] = '<front>';
            $placeholders .= ", '%s'";
          }
          $parents = db_fetch_array(db_query("SELECT p1, p2, p3, p4, p5, p6, p7, p8 FROM {menu_links} WHERE menu_name = '%s' AND link_path IN (" . $placeholders . ")", $args));
          if (empty($parents)) {

            // If no link exists, we may be on a local task that's not in the links.
            // TODO: Handle the case like a local task on a specific node in the menu.
            $parents = db_fetch_array(db_query("SELECT p1, p2, p3, p4, p5, p6, p7, p8 FROM {menu_links} WHERE menu_name = '%s' AND link_path = '%s'", $menu_name, $item['tab_root']));
          }

          // We always want all the top-level links with plid == 0.
          $parents[] = '0';

          // Use array_values() so that the indices are numeric for array_merge().
          $args = $parents = array_unique(array_values($parents));
          $placeholders = implode(', ', array_fill(0, count($args), '%d'));
          $expanded = variable_get('menu_expanded', array());

          // Check whether the current menu has any links set to be expanded.
          if (in_array($menu_name, $expanded)) {

            // Collect all the links set to be expanded, and then add all of
            // their children to the list as well.
            do {
              $result = db_query("SELECT mlid FROM {menu_links} WHERE menu_name = '%s' AND expanded = 1 AND has_children = 1 AND plid IN (" . $placeholders . ') AND mlid NOT IN (' . $placeholders . ')', array_merge(array(
                $menu_name,
              ), $args, $args));
              $num_rows = FALSE;
              while ($item = db_fetch_array($result)) {
                $args[] = $item['mlid'];
                $num_rows = TRUE;
              }
              $placeholders = implode(', ', array_fill(0, count($args), '%d'));
            } while ($num_rows);
          }
          array_unshift($args, $menu_name);
        }
        else {

          // Show only the top-level menu items when access is denied.
          $args = array(
            $menu_name,
            '0',
          );
          $placeholders = '%d';
          $parents = array();
        }

        // Select the links from the table, and recursively build the tree. We
        // LEFT JOIN since there is no match in {menu_router} for an external
        // link.
        $data['tree'] = menu_tree_data(db_query("\n          SELECT m.load_functions, m.to_arg_functions, m.access_callback, m.access_arguments, m.page_callback, m.page_arguments, m.title, m.title_callback, m.title_arguments, m.type, m.description, ml.*\n          FROM {menu_links} ml LEFT JOIN {menu_router} m ON m.path = ml.router_path\n          WHERE ml.menu_name = '%s' AND ml.plid IN (" . $placeholders . ")\n          ORDER BY p1 ASC, p2 ASC, p3 ASC, p4 ASC, p5 ASC, p6 ASC, p7 ASC, p8 ASC, p9 ASC", $args), $parents);
        $data['node_links'] = array();
        menu_tree_collect_node_links($data['tree'], $data['node_links']);

        // Cache the data, if it is not already in the cache.
        $tree_cid = _menu_tree_cid($menu_name, $data);
        if (!cache_get($tree_cid, 'cache_menu')) {
          cache_set($tree_cid, $data, 'cache_menu');
        }

        // Cache the cid of the (shared) data using the page-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];
  }
  return array();
}

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function menu_tree_page_data in Drupal 6

Parameters

Return value

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