Execute plugin outside dashboard

If you’re good with PHP and programming concepts you probably could. As in it’s not out of the realm of possibility.

The tricky parts as I see it would be:
1) Figuring out what would trigger your PHP code to run
2) Communicating between two servers on possibly two different domains (cross domain communication)
3) Making sure your code is secure (you don’t need someone to trick your code into loading up a malicious XML file)
4) Making sure your code has proper error checks and validation to make sure everything runs correctly (so it doesn’t crash your server if something fails or goes wrong)

And of course, the search engine penalty for having the same content posted on two different websites (i.e. if Google and other search engines catch you trying to bump up your rankings this way – your sites may be delisted from Google).

Thank you for your reply!

This is only for internal use to update or merge a release version of the blog with a test (new design) version of the same blog (same server; just two completely separate WordPress sites). The test version is excluded from search engines, so duplicate content is not a problem.

I can handle the trigger for when to run it. I just don’t know how to do it in PHP. Can you suggest some code to get me started? Thanks!