Hello my friends at Chegg, it's me once again. I need your expert input on a few things. Can you give me your insight on the following in regards to PHP:

-Post and answer to each of the following questions:

-What would you consider the basic rule for granting permissions to users?

-What are some issues that may arise from writing to files?

-What functions in PHP can help avoid this?

-What are some example of functions that help you obtain file and directory information?