PHP 7 Programming Cookbook

Using Traits and Interfaces

It is considered a best practice to make use of interfaces as a means of establishing the classification of a set of classes, and to guarantee the existence of certain methods. Traits and Interfaces often work together, and are an important aspect of implementation. Wherever you have a frequently used Interface that defines a method where the code does not change (such as a setter or getter), it is useful to also define a Trait that contains the actual code implementation.

How to do it...

1. For this example, we will use ConnectionAwareInterface, first presented in Chapter 4, Working with PHP Object-Oriented Programming. This interface defines a setConnection() method that sets a $connection property. Two classes in the ...