At our January monthly meetup MemphisPHP founder Jeremy Kendall will be talking about the Password Validator package that he wrote to ‘…make it (more) trivial to use the new password hash functions in your application. Just add the validator to your authentication script and you’re up and running.’
RSVP here: http://www.meetup.com/memphis-technology-user-groups/events/158306042/
Password Validator validates password_hash generated passwords, rehashes passwords as necessary, and will upgrade legacy passwords.
Read the introductory blog post: PHP Password Hashing: A Dead Simple Implementation
Password Validator is available for all versions of PHP >= 5.3.7.