实现多个接口的类如何被Doctrine中的任一接口引用？

• Class A implements Foo and Bar.
• Class P references a collection of Foos.
• Class Q references a collection of Bars.

How can class A be referred to as a Foo by P and a Bar by Q using Doctrine association mapping annotations?

Problems:

• Interfaces and traits cannot be the target of entity relationships: only abstract or concrete classes are treated as entities by Doctrine.
• We cannot convert both interfaces to abstract classes because PHP does not support multiple inheritance.
• The interfaces cannot be merged into one because other classes (not shown) may implement only one of the interfaces.