move_uploaded_file是如何工作的？

Question

I'm learning about the file uploading in php. For that I referred some links. In that they said inside the upload code we have to use:

move_uploaded_file(upload_file_name, 'path to move')

function for move the file to our desired directory.

But in move_uploaded_file function they pass the temp name as a first argument.

Why they are using the temp name as a first argument? Why not they used original name?

move_uploaded_file($_FILES['photo']['tmp_name'], 'uploads/'.$new_file_name);

Why we have to use this temp_name? Is there any reasons available for that?

Answer 1

When uploading a file, that file will be saved in your server`s temporary files directory, having a filename like /tmp/somefilename.

Using move_uploaded_file you will move that file to any destiation you like / you are allowed to.

The original filename like it was on the users computer is stored in$_FILES['userfile']['name']`.