On PHPMaster.com today there's a new tutorial about using a feature in the upcoming PHP release (5.4) to make it easier to work with more modular code - using traits.
In this article I will discuss traits, a new feature introduced in PHP 5.4 to overcome [issues where multiple inheritance is needed]. The concept of traits itself is nothing new to programming and is used in other languages like Scala and Perl. They allows us to horizontally reuse code across independent classes in different class hierarchies.
Included in the post is example code showing what the use of a trait looks like and a method for creating a Singleton that can spawn instances of two classes. Also included are examples of:
- using multiple traits at once,
- traits made up of traits,
- the importance of order,
- aliasing to avoid conflicts,
- and a few other features that come along with their use.