How to display a unique id with $_GET? [duplicate]

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Possible Duplicate:

How to generate unique id in mys开发者_运维知识库ql?

I have a uniqid() php script on my site which generates a unique id for every unique visitor. I would like to give each user a unique link which is displayed in a an input form, in the form of http://website.com/?id=12345 . Does anyone know how to do this?

I saw a different site accomplish this, so I know it's possible. I also know that I have to use the $_GET function since there is a ? after the url. Help.

---

<form action="http://website.com/" method="get">
 <input type="hidden" name="id" value="<?=uniqid()?>" />
 <input type="submit" value="Submit" />
</form>

This should do the trick...

---

Then on the page you submit to...

<?php
 echo $_GET['id'];
?>