Cryptography: Simplest Hash
Julien PACHET (contact me)
This class can be used to generate and verify unique hash values.
It can be used to prevent that a form is submitted twice or a link be followed more than once.
It generates a random hash value and store it in a MySQL database table. It assures that the hash is unique among all stored hash values.
It can make the hash value be valid for a limited period of time and not be used more than a given limit of times.
Click here for detailed information about this class on phpclasses.org
Php Handleiding