Talking about Service Container in laravel

[laravel] What is a Service Container? The laravel service container is a powerful tool for managing class dependencies and performing dependency injection.

From the explanation of Service Container in Laravel's official document, we can see that its function is to help us manage and inject dependencies.

Why use Service Container In Dependency Injection, we see that using dependency injection can greatly reduce the coupling degree of code, but it also brings a disadvantage, that is, we need to manage the injected objects ourselves. If a component has many dependencies, we need to create a setter method with multiple parameters to pass the dependencies, or a constructor with multiple parameters to pass them. In addition, we need to create dependencies every time before using the component, which makes our code difficult to maintain like this. Therefore, it is a practical and elegant method to provide a Service Container for dependent instances. For example, the following is laravel's entry file (comments removed):

// public/index.php