[Summary] Some commonly used design patterns in ThinkPHP development

ThinkPHP is a popular PHP open source framework that adopts some design patterns to help developers improve the maintainability and reusability of code. Below are some common design patterns used by ThinkPHP.

1. MVC pattern

MVC (Model-View-Controller) is a common design pattern that divides the logic of an application into three parts: model, Views and controllers. In this pattern, the model represents the application's data and business logic, the view represents the user interface, and the controller is responsible for passing data from the model to the view. ThinkPHP is a framework based on the MVC pattern, which separates the business logic and data processing of the application and hands over the processing of views to the template engine.

2. Singleton pattern

The singleton pattern is a design pattern that ensures that a class can only have one instance. In ThinkPHP, the singleton pattern is widely used. For example, the Config class is a singleton pattern that is responsible for reading and processing the application's configuration files. When using the Config class, obtain the only instance through the getInstance() method to avoid creating objects multiple times.

3. Factory Pattern

Factory pattern is a commonly used design pattern for creating objects. In ThinkPHP, the factory pattern is widely used. For example, the Controller class in ThinkPHP is an implementation of the factory pattern, which is responsible for creating objects containing controller logic. When using a controller, create an object through the factory method of the Controller class and pass the controller name and request object as parameters.

4. Strategy Pattern

Strategy pattern is a design pattern that encapsulates algorithms into independent classes so that they can be replaced with each other. In ThinkPHP, the strategy mode is widely used. For example, ThinkPHP's caching operation is implemented through the strategy mode.

5. Observer Pattern

The Observer pattern is a dependency relationship between objects. It establishes a one-to-many dependency relationship, allowing multiple observers to Listen to the same topic object at the same time. In ThinkPHP, the observer pattern is widely used. For example, ThinkPHP's event system is a system based on the observer pattern. When an event occurs in the application, all observers registered for the event will be notified.

In short, ThinkPHP adopts many common design patterns that can help developers improve the maintainability and reusability of code. Understanding these design patterns can help you better understand how the framework works and can also be used in your own applications.

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