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php 实现 dnspod 的监控功能

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Release： 2016-06-02 11:31:37
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dnspod 的监控功能, 他要监控几千万的网站, 用户又在更改监控频率, 他们是怎么实现所有网站都能按要求的频率监控的呢?
有的用户设置的10分钟检查一次, 有的用户5分钟一次

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