如何使用PHP将一个SQL命令的返回值插入到另一个表中

I have two servers hosting two different sites with two separate databases. However, some of the data needs to be shared - so there's a CRON that runs to copy that data from the first site to the second site. These two sites used to run on the same server, but now we have separated them so I'm attempting to amend the PHP to be able to handle this. I have two servers hosting two different sites