You can use 

$this->data['User']['confirm_code'] = string::uuid(); 

"The uuid is a 128bit string in the format of
485fc381-e790-47a3-9794-1337c0a8fe68"

http://book.cakephp.org/view/573/uuid

Dave

-----Original Message-----
From: Jas [mailto:[email protected]] 
Sent: October-05-09 11:15 PM
To: CakePHP
Subject: Are Hashed values unique?


I've got an Email confirmation/validation process working for new users, the
user receives an email with a link and this link has a hash value. I am just
wondering if it were possible that one word could have the same hash as
another?

Using either of these hash methods sha1/sha256/md5?
If so what are other people using to generate a unique code? apart from
date/time as that would be guessable.

Thanks


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