Upload image with unique name

Question

So I am trying to upload some images to a folder on my server with the script below,but it saves every image as \"image.jpg\" and it overwrites the last uploaded image if I

Answer 1

A simple way to get a unique filename is to get the current Unix time in milliseconds and append (or prepend) that to the filename. The command to use is microtime().

For example:

$target_file = $target_dir . microtime() . basename($_FILES["fileToUpload"]["name"]);

You could also try things like hashing the file to get a unique hash with low probability of collisions, but this is faster and just as effective.