Domain-Driven Design in PHP

Mapping Entities Using Annotated Code

When Doctrine was released, a catchy way of showing how to map objects in the code examples was by using annotations.

What's an annotation? An annotation is a special form of metadata. In PHP, it's put under source code comments. For example, PHPDocumentor makes use of annotations to build API information, and PHPUnit uses some annotations to specify data providers or to provide expectations about exceptions thrown by a piece of code:

class SumTest extends PHPUnit_Framework_TestCase  {     /** @dataProvider aMethodName */     public function testAddition() {         //...      } }

In order to map the Order Entity to the persistence store, the source code for the Order should be modified to add the Doctrine ...