What are the OOP design principles in PHP7.0?

What are the OOP design principles in PHP7.0?

As Web applications become more complex and have more functions, OOP (Object-Oriented Programming) has become the basic programming style of modern Web development. In OOP programming, PHP7.0 provides many principles to guide programmers to write more efficient, maintainable and scalable code. The following are the main principles of OOP programming in PHP7.0:

1. Single Responsibility Principle

The single responsibility principle requires that a specific part of a class is only responsible for one kind of responsibility. This principle is the core one of the OOP design principles. If a class has multiple responsibilities, it can lead to huge code clutter and difficulty in maintaining. Design patterns such as inheritance, interfaces, and dependency injection can help follow the single responsibility principle.

2. Open-Closed Principle

The Open-Closed Principle requires that a class be open for extension and closed for modification. This principle means that the code should be very easy to extend, but it should not be easy to modify. When requirements change, we should extend existing code rather than modify it. This can be achieved by using design patterns such as Strategy Pattern, Template Method Pattern, or Observer Pattern.

3. Dependence Inversion Principle

The Dependency Inversion Principle emphasizes that high-level modules in the system should not depend on low-level modules, but should rely on module interfaces or abstract classes . This principle can be achieved by using design patterns such as dependency injection (DI) or reverse control containers.

4. Liskov Substitution Principle (Liskov Substitution Principle)

The Liskov Substitution Principle believes that a derived class should be able to replace its superclass. The Liskov replacement principle is based on the concept of polymorphism. This principle can help follow the single responsibility principle and the dependency inversion principle, improving the scalability and maintainability of the code while maintaining the consistency of the code.

5. Interface Segregation Principle

The Interface Segregation Principle believes that clients should not be forced to implement methods that they do not care about. This principle emphasizes that large interfaces should be split into smaller interfaces to avoid unnecessary dependencies. This can be achieved by using the Adapter pattern or the Adapter pattern of tricks.

6. Composition/Aggregation Reuse Principle

Composition/Aggregation Reuse Principle believes that reusability should be achieved through composition or aggregation rather than inheritance . That is, we should use objects of other classes as member variables instead of inheriting this class. This principle can help reduce code duplication and reduce the complexity of inheritance.

To sum up, if you want to write maintainable, extensible and reusable OOP code, it is very necessary to follow these principles. PHP7.0 provides a variety of OOP programming models to support the implementation of these principles and help programmers write better code.

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