Need small webbased php script

I need to get a small php script made that is web based the script needs to (on push of button) go to pull from a url list in the same directory called [login to view URL] (sample file uploaded) then create a properly formatted rss feed called [login to view URL] then save this file to the same directory with permission 644 then go to button to ping the feed to rss feed directories on second button push.