If the function of people near WeChat is realized

If the function of people near WeChat is implemented:
the first one can use the redis-geo extension;
the second one can use the mysql5.7 geo extension; the
third one can use the es geo extension; the
fourth one can use Baidu's API or API of WeChat;
the fifth advanced feature that can use Lucene;
implementation principle: find points in the inscribed circle of coordinates