How to generate short filenames for uploaded photos?
<p>While uploading new photos to a linux server with PHP, I'm having to give them unique names (using  it's file name is ruled out). There's no interaction with a DB so getting unique IDs is also not possible. </p>

<p>I thought of using <strong>DATE+TIME.jpg</strong>, but that's just too long. </p>

<p>So what is the best method to create the shortest possible unique names with PHP? </p>
