<?php

/**
 * Implements hook_uninstall(). 
 */
function node_view_permissions_uninstall() {
  // Remove variables for all node types, which are set by our module.
  $query = db_delete('variable');
  $query->condition('name', 'node_view_permissions_%', 'LIKE');
  $query->execute();
  
  if (count(module_implements('node_grants'))) {
    node_access_needs_rebuild(TRUE);
  }
}