public function BookManager::bookTreeGetFlat in Drupal 10

Same name and namespace in other branches

1. 8 core/modules/book/src/BookManager.php \Drupal\book\BookManager::bookTreeGetFlat()
2. 9 core/modules/book/src/BookManager.php \Drupal\book\BookManager::bookTreeGetFlat()

File

core/modules/book/src/BookManager.php, line 773

Class

BookManager

Defines a book manager.

Namespace

Drupal\book

Code

public function bookTreeGetFlat(array $book_link) {
  if (!isset($this->bookTreeFlattened[$book_link['nid']])) {

    // Call $this->bookTreeAllData() to take advantage of caching.
    $tree = $this
      ->bookTreeAllData($book_link['bid'], $book_link, $book_link['depth'] + 1);
    $this->bookTreeFlattened[$book_link['nid']] = [];
    $this
      ->flatBookTree($tree, $this->bookTreeFlattened[$book_link['nid']]);
  }
  return $this->bookTreeFlattened[$book_link['nid']];
}