What does php object-oriented mean?

PHP is an object-oriented programming language. Understanding object-oriented programming ideas is very important for learning PHP development. The following Chuanzhi Podcast will introduce to you what PHP object-oriented thinking is.

#1. The concept of object-oriented

Object-oriented is a programming idea that conforms to human thinking habits. There are various things of different forms in real life, and there are various connections between these things. Using objects in programs to map things in reality and using object relationships to describe the connections between things is object-oriented.

When it comes to object-oriented, you will naturally think of process-oriented. Process-oriented is to analyze the steps required to solve the problem, and then use functions to implement these steps one by one. When using them, just call them one by one. Object-oriented is to divide the problem to be solved into multiple independent objects according to certain rules, and then solve the problem by calling the object's method. Of course, an application will contain multiple objects, and the functions of the application are implemented through the cooperation of multiple objects. In this way, when the application functions change, only individual objects need to be modified, making the code easier to obtain. maintain.

2. Object-oriented characteristics

The characteristics of object-oriented can be summarized as encapsulation, inheritance and polymorphism. Next, we will focus on these three characteristics. a brief introdction.

● Encapsulation

Encapsulation is the core idea of ​​object-oriented. It encapsulates the properties and behaviors of objects without letting the outside world know the specific implementation details. This is the idea of ​​encapsulation. For example, when using a computer, a user only needs to use his fingers to type on the keyboard. There is no need to know how the computer works internally. Even though the user may happen to know how the computer works, he does not completely rely on the details of how the computer works when using it.

● Inheritance

Inheritance mainly describes the relationship between classes. Through inheritance, the functions of the original class can be modified without rewriting the original class. Expand. For example, there is a car class that describes the general features and functions of the car, and the car class should not only include the car's features and functions, but also add car-specific functions. In this case, the car class can inherit For the car class, just add the car characteristics separately to the car class. Inheritance not only enhances code reusability and improves development efficiency, but also facilitates program modification and addition.

●Polymorphism

Polymorphism refers to the phenomenon of duplicate names being allowed in a program. It means that after the properties and methods defined in one class are inherited by other classes, they can Have different data types or exhibit different behaviors, which makes the same properties and methods have different semantics in different classes.

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