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/**
* 定期清理已读通知
*
* @param $period 周期, 单位: 秒
*/
public function clean_mark_read_notifications($period)
{
while ($notifications = $this->fetch_all('notification', 'read_flag = 1 AND add_time < ' . (time() - $period), 'notification_id ASC', 1000))
{
foreach ($notifications AS $k => $v)
{
$this->delete('notification', 'notification_id = ' . $v['notification_id']);
$this->delete('notification_data', 'notification_id = ' . $v['notification_id']);
}
}
return true;
}
加在计划任务里即可，一个月是 2592000 秒 
