calculating checksum when uploading a file

Question

Hi, I am uploading files to server. I found a function like

$sha1 = sha1_file($filename);

at http://www.tuxradar.com/practicalphp/8/15/0

So I was wonder whether or not $filename should point to the actual file with path or just the filename?

$_FILES['upload']['name'] will do it right?

Answer 1

Nope, wrong.
Why can't you just try it and see?

According to manual page, the path to uploaded file is in the $_FILES['upload']['tmp_name'] variable

Answer 2

Read up on the basics of handling file uploads in PHP

Preferably, do a move_uploaded_file() first, then in the target location, fetch the checksum.

Answer 3

The path to uploaded file is $_FILES["upload"]["tmp_name"]

so if you haven't moved the uploaded file the function call would be

$sha1 = sha1_file($_FILES["upload"]["tmp_name"]);