文件上传期间临时文件名的重点是什么？

Question

What is the point of $_FILES["file"]["tmp_name"]?

I know it is the name of the temporary copy of the file stored on the server but why do we need this when we have $_FILES["file"]["name"]?

I would assume it has to do with preventing name collisons, is that true? Are there other reasons? I'm using PHP syntax but I would guess the concept would apply to all the languages?

Answer 1

1. This is not a PHP syntax.
2. $_FILES['x']['name'] stores the name of the file on the user's filesystem - this is only extra information that is set up by the browser - just like $_FILES['x']['type'].
3. $_FILES['x']['tmp_name'] stores the name of the uploaded file on the server.

EDIT:

When you upload a file, it is phisically stored on the server's hard drive. A name to the file (not the entire path) will be available in your PHP under $_FILES['x']['tmp_name'] variable. You should move the file using move_uploaded_file() function. This function knows the path to the directory where the file is stored, so it's capable of moving the file to its new location.

$_FILE['x']['name'] / ['type'] are actually completely useless as the're being set by the browser during file upload, therefore they could store false information.