What is the Doctrine project?

The Doctrine Project is the collection of PHP libraries that help with working with databases in PHP. The core projects are the Object Relational Mapper (ORM) and the Database Abstraction Layer (DBAL) but there are many others:

• Annotations
• Cache
• Coding Standard
• Collections
• Common
• Data fixtures
• Database Abstraction Layer
• Event Manager
• Inflector
• Instantiator
• Lexer
• Migrations
• MongoDB Object Document Mapper
• Object Relational Mapper
• Persistence
• PHPCR ODM
• Reflection
• RST Parser
• Skeleton Mapper

Sources

• The Doctrine Project – official website