function BookManager::bookTreeGetFlat

File

core/modules/book/src/BookManager.php, line 775

Class

BookManager

Defines a book manager.

Namespace

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']];
}