function book_export_traverse
book_export_traverse($tree, $visit_func)
Traverses the book tree to build printable or exportable output.
During the traversal, the $visit_func() callback is applied to each node and is called recursively for each child of the node (in weight, title order).
Parameters
$tree: A subtree of the book menu hierarchy, rooted at the current page.
$visit_func: A function callback to be called upon visiting a node in the tree.
Return value
The output generated in visiting each node.
File
- modules/book/book.module, line 1240
- Allows users to create and organize related content in an outline.
Code
function book_export_traverse($tree, $visit_func) { $output = ''; foreach ($tree as $data) { // Note- access checking is already performed when building the tree. if ($node = node_load($data['link']['nid'], FALSE)) { $children = ''; if ($data['below']) { $children = book_export_traverse($data['below'], $visit_func); } if (function_exists($visit_func)) { $output .= call_user_func($visit_func, $node, $children); } else { // Use the default function. $output .= book_node_export($node, $children); } } } return $output; }
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Licensed under the GNU General Public License, version 2 and later.
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https://api.drupal.org/api/drupal/modules!book!book.module/function/book_export_traverse/7.x