如何重置drupal7节点作者UID，当节点作者被删除？

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php$nids=db_query('SELECT nid FROM node WHERE NOT EXISTS(SELECT NULL FROM users WHERE users.uid=node.uid)')->fetchCol();foreach ($nids as $nid) { $node=node_load($nid); $node->uid=0; node_save($node);}

$nids = db_query('SELECT nid FROM node WHERE NOT EXISTS(SELECT NULL FROM users WHERE users.uid = node.uid)')->fetchCol(); foreach($nids as $nid) { $node = node_load($nid); $node->uid = 0; node_save($node); }