ThinkPHP6 Container Usage Guide: Dependency Injection Practice

ThinkPHP6 Container Usage Guide: The Practice of Dependency Injection

Introduction:
In modern PHP development, it is common to use containers to implement dependency injection. technical means. In the latest version of the ThinkPHP framework, ThinkPHP6, container components are also integrated to facilitate developers to practice dependency injection. This article will introduce in detail how to use containers correctly in ThinkPHP6, and use sample code to help readers better understand.

1. What is a container?
A container is an object that is responsible for managing the instantiation and dependency injection of classes. It automatically injects dependencies between objects by parsing and generating object instances.

In ThinkPHP6, container components are implemented through Symfony's dependency injection component. It provides developers with a concise and fast way to implement class instantiation and dependency injection.

2. How to use the container

1. Configuring the container
   In ThinkPHP6, the container configuration file is located in the provider.php file in the config directory. We can define how the class is instantiated and its dependencies in this file.

For example, we need to configure a class named "demo", which depends on another class named "example", we can configure it like this:

return [
    'demo'    => [
        ppdemoDemo::class, // 类名
        ['example'], // 依赖的其他类
        true, // 是否为单例
    ],
];

In the above In the configuration, we define the class ppdemoDemo as "demo", depend on the class "example", and specify it as a singleton mode (true means singleton, false means non-singleton).

2. Instantiate objects
   After the container configuration is completed, we can use the container to instantiate the objects we need. First, we need to introduce the container class where we need to use the class:

use thinkContainer;

Then, we can use the container to instantiate the object in the following way:

$demo = Container::pull('demo');

In the above code, We use the Container::pull() method to instantiate an object named "demo" and assign it to the $demo variable.

3. Register container
   After we complete the configuration in the container configuration file provider.php, we also need to register the container during the initial process. We can add the following code after "Define Framework Directory" in the project's entry file public/index.php:

require __DIR__ . '/../vendor/autoload.php';

// 注册容器
    hinkContainer::getInstance()->register();

In the above code, we use the Container::getInstance() method to obtain the container instance, and register the container using the register() method.

3. Summary
Through the introduction of this article, we have learned about the method of using containers to implement dependency injection in ThinkPHP6. First we need to configure the container in the configuration file provider.php, and then instantiate the object through the Container::pull() method. Finally, just register the container in the entry file.

This method of using containers can help developers manage dependencies between classes more standardized and flexibly, and improve the reusability and maintainability of code. I believe that through studying this article, readers will have a deeper understanding of the use of ThinkPHP6 containers.

Reference code:

<?php
// 容器配置文件config/provider.php

return [
    'demo'    => [
        ppdemoDemo::class,
        ['example'],
        true,
    ],
];

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