Yii is a popular object-oriented PHP framework. Its full name is "Yes It Is", which means "Yes, it is like this". It is designed to be efficient, fast, secure and easy to use, so it is widely used in the development of large-scale web applications. In this article, we will introduce some basic knowledge of Yii framework to help novices better understand this framework.

1. MVC Architecture

The Yii framework adopts a design pattern based on MVC (Model-View-Controller), which divides the application into three parts: Model ( Model represents data and business logic, View implements user interface, and Controller is responsible for managing process control and data exchange.

The advantage of the MVC architecture is that it separates different parts of the application, making the code easier to maintain and extend. In addition, MVC also provides better reusability, making the code more modular and clear.

2. Gii code generator

The Yii framework has a built-in powerful code generator Gii, which can help programmers generate code for models, controllers, views, etc., thus Improve development efficiency. Gii can automatically generate some common CRUD (Create, Read, Update, Delete) operations, allowing programmers to quickly generate basic functions.

Using Gii to generate code can avoid repeated coding and inefficient development processes while ensuring readability and maintainability.

3. Database Operation

The Yii framework has built-in powerful Active Record class for managing database operations. It provides programmers with a convenient data structure that maps database tables into objects.

By using the Active Record class, programmers can easily perform CRUD operations on the database without manually writing SQL statements. In addition, data access through the Active Record class also has better security because it automatically prevents SQL injection attacks.

4. Modular design

Yii framework is a very flexible framework that supports modular design. Programmers can break down functionality into several modules, which can be developed and tested independently. Finally, modules are combined into applications to form complete applications.

The advantage of modularity is that it makes code more reusable and extensible. If you need to modify a certain function, you only need to modify the corresponding module, not the entire application.

5. Extensibility

The Yii framework is highly scalable and can quickly adapt to various needs. The Yii framework integrates many already developed extension plug-ins, which can quickly extend the functionality of the framework. Extension packages can be easily installed through Composer, allowing for quick reference to third-party plug-in libraries.

In addition to these already developed extension plug-ins, the Yii framework also allows programmers to develop their own plug-ins and publish them to various code libraries through Composer. This provides great flexibility for programmers who require higher-level functionality.

Summary

The above are some basic knowledge of Yii framework. In actual development, programmers can learn more features and functions of the Yii framework based on actual needs, and combine them with their own experience to quickly develop efficient, secure, and easy-to-maintain Web applications.

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