1 book.module _book_toc_recurse($tree, $indent, &$toc, $exclude, $depth_limit)

Recursively processes and formats menu items for book_toc().

This helper function recursively modifies the table of contents array for each item in the menu tree, ignoring items in the exclude array or at a depth greater than the limit. Truncates titles over thirty characters and appends an indentation string incremented by depth.


$tree: The data structure of the book's menu tree. Includes hidden links.

$indent: A string appended to each menu item title. Increments by '--' per depth level.

$toc: Reference to the table of contents array. This is modified in place, so the function does not have a return value.

$exclude: (optional) An array of menu link ID values. Any link whose menu link ID is in this array will be excluded (along with its children). Defaults to an empty array.

$depth_limit: Any link deeper than this value will be excluded (along with its children).


core/modules/book/book.module, line 1093
Allows users to create and organize related content in an outline.


function _book_toc_recurse($tree, $indent, &$toc, $exclude, $depth_limit) {
  foreach ($tree as $data) {
    if ($data['link']['depth'] > $depth_limit) {
      // Don't iterate through any links on this level.

    if (!in_array($data['link']['mlid'], $exclude)) {
      $toc[$data['link']['mlid']] = $indent . ' ' . truncate_utf8($data['link']['title'], 30, TRUE, TRUE);
      if ($data['below']) {
        _book_toc_recurse($data['below'], $indent . '--', $toc, $exclude, $depth_limit);