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将多个 RSS 地址合并成一个

一、PHP实现

可以从【这里】下载

来源：[php] 将多个 RSS 地址合并成一个 – fivestone

二、第三方

With no limits on the number of combined feeds you can create or how many requests can be made on each. Create combined RSS feeds from multiple sources.

https://feederss.com/index.html