Rebuilds the node access database.
This rebuild is occasionally needed by modules that make system-wide changes to access levels. When the rebuild is required by an admin-triggered action (e.g module settings form), calling node_access_needs_rebuild(TRUE) instead of node_access_rebuild() lets the user perform his changes and actually rebuild only once he is done.
Note : As of Drupal 6, node access modules are not required to (and actually should not) call node_access_rebuild() in hook_enable/disable anymore.
$batch_mode: (optional) Set to TRUE to process in 'batch' mode, spawning processing over several HTTP requests (thus avoiding the risk of PHP timeout if the site has a large number of nodes). hook_update_N() and any form submit handler are safe contexts to use the 'batch mode'. Less decidable cases (such as calls from hook_user(), hook_taxonomy(), etc.) might consider using the non-batch mode. Defaults to FALSE.
function node_access_rebuild($batch_mode = FALSE) {
db_delete('node_access')
->execute();
// Only recalculate if the site is using a node_access module.
if (count(module_implements('node_grants'))) {
if ($batch_mode) {
$batch = array(
'title' => t('Rebuilding content access permissions'),
'operations' => array(
array(
'_node_access_rebuild_batch_operation',
array(),
),
),
'finished' => '_node_access_rebuild_batch_finished',
);
batch_set($batch);
}
else {
// Try to allocate enough time to rebuild node grants
drupal_set_time_limit(240);
// Rebuild newest nodes first so that recent content becomes available quickly.
$nids = db_query("SELECT nid FROM {node} ORDER BY nid DESC")
->fetchCol();
foreach ($nids as $nid) {
$node = node_load($nid, TRUE);
// To preserve database integrity, only acquire grants if the node
// loads successfully.
if (!empty($node)) {
node_access_acquire_grants($node);
}
}
}
}
else {
// Not using any node_access modules. Add the default grant.
db_insert('node_access')
->fields(array(
'nid' => 0,
'realm' => 'all',
'gid' => 0,
'grant_view' => 1,
'grant_update' => 0,
'grant_delete' => 0,
))
->execute();
}
if (!isset($batch)) {
drupal_set_message(t('Content permissions have been rebuilt.'));
node_access_needs_rebuild(FALSE);
cache_invalidate_tags(array(
'content' => TRUE,
));
}
}