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For our products, like the trivago [hotel search](https://www.trivago.com/), we are using [Redis](http://redis.io/) a lot. The use cases vary: Caching, temporary storage of data before moving those into another storage or a typical database for hotel meta data including persistence. The main parts of the hotel search are built with PHP and the Symfony Framework for the frontend (web) and Java for the backend part. In this article, we will focus on the collaboration between our PHP application and Redis. Both are running fine, but it was a long and hard way up to the current situation. This is the story of how we learned to use Redis, including our failures and experience.

OpenProject vs. Redmine: A comparison of OpenProject to Redmine shows how both tools now differ in usability even though they have the same roots.