The Doctrine Project is the home to several PHP libraries primarily focused on database storage and object mapping. The core projects are a Object Relational Mapper (ORM) and the Database Abstraction Layer (DBAL) it is built upon.
-Around since 2006 with very stable, high-quality codebase.
-Extremely flexible and powerful object-mapping and query features.
-Support for both high-level and low-level database programming for all your use-cases.
-Large Community and integrations with many different frameworks (Symfony, Zend Framework, CodeIgniter, FLOW3, Lithium and more)