Project

1. What does the project do

　Business logic -> Add, delete, modify and check

2. What is object-oriented programming and what are its benefits?

　oop：object oriented programming

　<>Core idea: Use the way humans think and solve problems to program.

　<>Three major features of oop

　 Encapsulation: The first level of meaning is to encapsulate properties and methods together to form an object.

　　　The second meaning is to hide the internal implementation details and provide an operable interface (public) to the outside world

　Inheritance: Subclasses can directly use the properties and methods (non-private) defined by the parent class through inheritance. The extend code can be reused.

　　Polymorphism: In different contexts (contexts), its manifestations are different. Php itself is polymorphic.

　<>Why is PHP polymorphic

　　PHP is a weakly typed language

　　$a='php';$a is a string type data

　　$a=100;$a is an integer data

　<>Benefits of oop

　　Reusable

　Maintainable

　　Expandable

　　Relatively high flexibility

3. MVC pattern

　Combined with a single entrance　　index.php?p=admin&c=goods&a=insert　　(Complete the product addition in the background, C corresponds to the controller (class), a corresponds to the method)

4. My knowledge and understanding of MVC

　<>What is MVC?

　　It is a design pattern

　M: model, model, completes specific business logic

　　V: view, view, responsible for displaying information

　　C: controller, controller, is responsible for issuing orders and plays the role of traffic police

　<>The core idea of ??MVC

　　Separate business logic and display

　<>Specific description of the details of MVC

　　

　Note: There are two ways to describe the understanding of the model

　　1. Model in a broad sense: database model and tool model

　　 2. Model in a narrow sense: database model

　<>Advantages and Disadvantages of MVC

Advantages: clear layering, easy communication, easy team development, easy maintenance

Disadvantages: High learning cost, more troublesome for small projects

　<>What is the direct relationship between oop and MVC

　　There is no direct relationship, but using oop to implement MVC is the perfect solution

4. Project structure description

　Every excellent project has a good project structure.

5. Construction process