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1. drupal
   1. drupal6
   2. drupal7

Traverse 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).

Übergabeparameter

$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.

Rückgabewert

The output generated in visiting each node.

Code

modules/book/book.module, line 906

<?php
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;
}
?>