Hashing image names

Question

I'm uploading images to S3 and I wish to create a unique name for each one uploaded.

I'm using intervention to make the image:

$img = Image::make($file->getRealPath());

Then I hash the image:

$name = hash('sha256', $img);

The problem is, when I upload the same image, it's given the same name.

How can I get around this?

Answer 1

You should try to add a salt to it. Even appending the date/time should give you an unique name. Cheers!

PS (edit):

$data = Image::make($file->getRealPath())->encode('data-url'); 

$name = hash('sha256', $data . strval(time()));

First we encode the data in a "string way" so we can concatenate the time value as a string.

If you want extra "randomness" add a user cookie, username etc.

Final solution:

$data = implode('', file($file->getRealPath()));

$name = hash('sha256', $data . strval(time()));

Answer 2

Have you considered using com_create_guid() to create a global unique identifier instead? This would give you a unique name for each file. For example:

$name = com_create_guid();