How to send files via php.

Question

I want my main server to send edit and remove files from the private servers.
Here is a diagram: http://sml.ddns.net/server_dia.PNG

Answer 1

you cannot handle directly the files on a server but you can invoke scripts on that server that create/edit/delete files as defined by the code.

look for basic post requests (including how to upload a file via post request),
file handling in php