I've decided to share with you a very old project, which I built while learning phalcon 2 years ago. It's a RSS aggegator for student newspapers, but can be used with any rss feed. It implements cosine similarity for finding articles covering the same topic.
The code is messy, ugly and doesn't follow any standards or logic but shows different features of phalcon, again - it was a learning project.
Maybe someone will find it useful one day!