Backend DevelopmentPHP TutorialWhat is php object-oriented? Introduction to the meaning of object-oriented php
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The meaning is summarized through Baidu.
The key concept of object-oriented programming technology is that it puts data and operations on data together as an interdependent and indivisible whole - an object. After classifying and abstracting objects of the same type, common characteristics are derived to form classes. Object-oriented programming is all about defining these classes. A class is a collection of objects that describe the same type. After the class is defined, it will be used as a data type to create objects of the class. The execution of a program is represented by interactive communication between a set of objects. Objects communicate with each other through public interfaces to complete system functions. The public members declared in the class constitute the external public interface of the object
OOP achieves the three main goals of software engineering: reusability, flexibility and scalability
Process-oriented is to put an A project is decomposed into small functions and implemented one by one.
Object-oriented is to regard things as consisting of small objects, or small parts. The interrelationships between them constitute the entire project. . . . . These are two completely different design ideas:
Case:
We have guests at home, we need to boil water to make tea
Process-oriented design method: One wash the cup 2 Boil water. Put tea leaves in three cups. Boil four water. Pour boiling water into the cups.
Object-oriented design method: two objects: kettle and cup
Attributes of the cup: material: glass, stainless steel, or ceramic
Cleanliness
##What is a class?
A class is a collection of objects with the same properties and services. It provides a unified abstract description for all objects belonging to the class.
In object-oriented programming languages, a class is an independent program unit. It should have a class name and include both
attribute descriptionand
service descriptionmain part. What is an object? An object is an entity used to describe objective things in the system. It is a basic unit that constitutes the system.
An object consists of a set of properties and a set of services that operate on such properties.
1. Easy to maintain
The structure is designed with object-oriented thinking and has high readability. Due to the existence of inheritance, even if the requirements change, the maintenance will only be in the local module, so it is very convenient and easy to maintain. Lower cost.2. High quality
When designing, existing classes that have been tested in the field of previous projects can be reused to make the system meet business needs and have high quality.3. High efficiency
During software development, things in the real world are abstracted and classes are generated according to the needs of the design. Using this method to solve problems is close to daily life and natural way of thinking, which will inevitably improve the efficiency and quality of software development.
4. Easy to Expand
Due to the characteristics of inheritance, encapsulation, and polymorphism, a system structure with high cohesion and low coupling is naturally designed, making the system more flexible, easier to expand, and lower in cost.
Related recommendations:
php object-oriented programming (2), php Object-Oriented Programming
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