Returns an array with default values for a book page's menu link.
$nid: The ID of the node whose menu link is being created.
The default values for the menu link.
function _book_link_defaults($nid) {
return array(
'original_bid' => 0,
'menu_name' => '',
'nid' => $nid,
'bid' => 0,
'router_path' => 'node/%',
'plid' => 0,
'mlid' => 0,
'has_children' => 0,
'weight' => 0,
'module' => 'book',
'options' => array(),
);
}