Where and what rights must be set to write to the local server?

Question

linux

I perform some functions in php, but the wrong permissions are set that do not allow recording.

move_uploaded_file($_FILES["filename"]["tmp_name"], "/var/www/image ".$_FILES["filename"]["name"]);

A file with "read-only" rights is created at the root of the local server, as I understand it, a temporary file. But nevertheless, nothing is written to /var/www/image.
mkdir ("/var/www/imagenew", 0777);
A read-only folder is created, without the possibility of writing files there, without specifying 0777, the same thing.
I think the problem is in the wrong setting of linux / apache rights

Answer 1

See what user apache is running under and who owns the directory you are trying to write to. Don't use 777 on directories, use 750 or even 700.