What are the implementation methods of protocol design in PHP7.0?

Protocol design appeared in PHP7.0. For better compatibility and scalability, the main implementation methods of this design are as follows:

1. Define interface: in PHP7.0 , implement protocol design by defining interfaces. An interface is an abstract type that defines a set of abstract methods that will be implemented by classes in the future. Through interfaces, implementations can provide a common way to call methods for different classes and different data types.
2. Using Trait: Trait is a new feature introduced in PHP7.0 that allows code blocks to share methods and attributes between different classes. By using traits, similar methods in a class can be extracted into independent function sets, which also facilitates code maintenance.
3. Use abstract classes: Abstract classes are classes that contain abstract methods. These methods are only declared in the abstract class and do not contain any specific implementation. When you need to implement abstract methods, these methods must be overridden in derived classes. Abstract classes allow you to specify common method implementations and refine and concretize them in derived classes.
4. Use anonymous classes: An anonymous class is a class without a class name that can be created at runtime. Anonymous classes allow you to create a separate class with the code necessary for a single task. Anonymous classes can be used together with interfaces, abstract classes, and traits, and Anonymous Class can be used to implement different dynamic interface implementations.

To sum up, protocol design is a new feature in PHP7.0. It provides a variety of implementation methods such as interfaces, traits, abstract classes and anonymous classes. Through protocol design, more general, standard, flexible and extensible methods can be provided for classes and interfaces. It should be noted that the choice of implementation method should be based on specific business conditions and needs.

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