In modern PHP development, dependency injection is an indispensable technology. It allows us to manage code complexity more easily and promotes code reuse and maintainability. As a popular PHP framework, ThinkPHP6 also provides a simple way to implement dependency injection-Ioc container.

Ioc container is Inversion of Control (Container), which is a general factory pattern used to implement dependency injection of objects. Through the Ioc container, we can separate the creation of objects and the dependency injection of objects. In ThinkPHP6, the IoC container is integrated into the core components of the framework and can be used throughout the application.

So, how to use the Ioc container in ThinkPHP6 to implement dependency injection? We will explain it in detail below.

Step 1: Create a class that needs to be instantiated

First, we need to create a class that needs to be instantiated, and define the dependencies that need to be injected in this class. As an example, here we create a UserService class and inject an instance of the UserRepository class in the constructor.

namespace appservice;

use appepositoryUserRepository;

class UserService
{
    protected $userRepository;

    public function __construct(UserRepository $userRepository)
    {
        $this->userRepository = $userRepository;
    }

    public function getUserList()
    {
        return $this->userRepository->getList();
    }
}

Step 2: Create dependent classes

Next, we need to create the dependent class UserRepository first. In the example, we simply define a getList method that returns a list of all users.

namespace appepository;

class UserRepository
{
    public function getList()
    {
        return ['user1', 'user2', 'user3'];
    }
}

Step 3: Configure the Ioc container

Now, we need to configure the Ioc container in the application's configuration file. In ThinkPHP6, the configuration file is located in the config directory. It is recommended that we create a new container.php configuration file.

In this configuration file, we need to register the classes that need to be instantiated and the classes they depend on so that the Ioc container can correctly inject dependencies.

Assuming that we have created two classes, UserService and UserRepository, we need to register them in the container as follows:

use appserviceUserService;
use appepositoryUserRepository;

return [
    'services' => [
        UserService::class => function($container) {
            return new UserService(
                $container->get(UserRepository::class)
            );
        },
    ],
    'repositories' => [
        UserRepository::class => new UserRepository(),
    ],
];

In the above code, we first add the UserService class and its dependent The UserRepository class is registered with the services ('services') and repository ('repositories') types. The service can be injected, but the warehouse does not need to be injected, so the service needs to use a callback function to create an object and inject dependencies, while the warehouse is directly instantiated and registered.

Step 4: Use the Ioc container

Finally, we need to use the Ioc container to instantiate the service registered in the container.

In our example, we can use the Ioc container in the controller to inject UserService and call methods. In the specific code, we can write like this:

namespace appcontroller;

use appserviceUserService;
use thinkacadeContainer;

class UserController
{
    public function index()
    {
        $userService = Container::get(UserService::class);
        $userList = $userService->getUserList();
        return json($userList);
    }
}

In the above code, we first use the get method of the container to get the instance of UserService, then call the getUserList method to get the user list, and return the list in json format .

After completing the above configuration, we successfully used ThinkPHP6's Ioc container to implement dependency injection.

Summary

In this article, we explain in detail how to use ThinkPHP6's Ioc container to implement dependency injection. Through the Ioc container, we can separate the dependency injection of objects from the creation of objects, making the code easier to manage and maintain. At the same time, Ioc containers can also greatly simplify our code logic and improve the reusability and testability of the code.

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