ThinkPHP 5.1 is one of the most popular PHP frameworks in China. Its container is one of the important components. Containers are a technology for handling dependency injection. This article will discuss what containers are, why you need them, and how to use containers in ThinkPHP 5.1.

1. What is a container?

Container is a pattern used to manage and organize the creation, destruction and life cycle of objects. It can also handle dependencies between objects. The container maintains a registry of objects that stores instances of all objects and provides applications with access to these instances. If an application needs an object, it can get it from the container instead of creating the object directly.

2. Why do we need containers?

In traditional PHP development, in order to use an object, we usually create an instance object in the code and then directly call the method of this object. We can also use global variables to manage objects and then use this object anywhere. This approach may lead to problems such as code testability, scalability, and maintainability. The emergence of containers can solve these problems. Containers manage the network of object instances and introduce IOC (Inversion of Control) understanding to handle objects. Dependency injection, which is more interface-oriented in architecture, has better testability, scalability, maintainability and other advantages.

3. How to use ThinkPHP5.1 container?

Containers are widely used in ThinkPHP 5.1. In the process of using containers to create objects and dependency injection, here is an example so that everyone can better understand how containers work:

1. Add a configuration file, such as container.php, in the application/extra directory.

<?php

return [
    &#39;foo&#39; =>?function?()?{
????????return?new?\app\common\Foo();
????}
];

2. Wherever you need to use the Foo class, use the container to look for it in the configuration.

<?php

namespace app\index\controller;

use think\App;
use think\facade\Container;

class Index
{
    protected $foo;

    public function __construct(App $app)
    {
        $this->foo?=?Container::get('foo');
????}

????public?function?index()
????{
????????return?$this->foo->bar();
????}
}

In this example, we add an item named "foo" to the container. When we need to use the Foo class, we can access this object in the container.

Containers make code more readable, testable, scalable and maintainable. Using containers, we can more easily manage and organize objects in the application, and can also easily perform dependency injection.

Summary

Containers are an important technology that can help us solve some problems in traditional PHP development. By using containers, we can better organize and manage objects and build applications that are testable, scalable, and maintainable. In ThinkPHP 5.1, containers are widely used and dependency injection can be done easily. The above is a less in-depth container case. In actual applications, considering the needs of system architecture and business logic, more beautiful coding is used for container applications.

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