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   2. drupal7

Recursive helper function for book_get_flat_menu().

Code

modules/book/book.module, line 529

<?php
function _book_flatten_menu($tree, &$flat) {
  foreach ($tree as $data) {
    if (!$data['link']['hidden']) {
      $flat[$data['link']['mlid']] = $data['link'];
      if ($data['below']) {
        _book_flatten_menu($data['below'], $flat);
      }
    }
  }
}
?>