Explanation : some php handler issue occurred at server-side, which made all of my php file getting downloaded from server on 8-10 of my domains (hosted on same hosting) instead of parsing and displaying.
Server people claim that they have corrected, if i visit the sites now from my regular PC & browser the url is still giving me files to download. if from anyother PC or Browser its parsing the page and not downloading.
It 99% seems cached content issue after their efforts.
Problem : All of my OLD-regular users are now getting the files download rather parse. I cannot contact every user to clear their browser cache (if it is cache issue).
What can i do to resolve issue as a webmaster and make all my users get files parsed rather download.