Can third-party php scripts change hosting files?

Question

Information Security

Can third-party php scripts change files on my site through for example
fwrite()

Answer 1

If you have access, of course you can.

Answer 2

still as they can, that's why he shared

Answer 3

For some reason, in the question it seemed to me that the author meant changing files, sort of like with the allow_url_include option. If this is the case, then third-party scripts will not be able to write or change something on the site via http.
Or explain what you mean by "third-party PHP scripts"

Answer 4

On your site, only scripts uploaded to your site can write to files, no more, no less. Well, plus the hosting admin himself, of course, can also do this if he suddenly needs it.