Use Composer to solve dependency injection: application of PSR-11 container interface

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Dependency management is a common but difficult problem when developing large PHP projects. Initially, I tried using global variables and manually injecting dependencies, but this not only increased the complexity of the code, but also easily led to errors. Finally, I successfully solved this problem by using the PSR-11 container interface and with the power of Composer.

PSR-11 (PHP-FIG Standard Recommendation Report 11) defines a common container interface, which is a standardized abstraction of dependency injection containers. Using PSR-11 can ensure that your project is compatible with different container implementations, thereby improving the portability and maintainability of your code.

To use the PSR-11 container interface in your project, you need to first install it through Composer:

 <code>composer require psr/container</code>

After installation, you can use the interface defined by PSR-11 to build your dependency injection system. Here is a simple example showing how to use the PSR-11 container interface:

 <code class="php">use Psr\Container\ContainerInterface; class MyService { private $dependency; public function __construct(DependencyInterface $dependency) { $this->dependency = $dependency; } public function doSomething() { // 使用依赖做一些事情} } class MyContainer implements ContainerInterface { private $entries = []; public function get($id) { if (!$this->has($id)) { throw new NotFoundException('No entry was found for this identifier.'); } return $this->entries[$id]; } public function has($id) { return isset($this->entries[$id]); } public function set($id, $value) { $this->entries[$id] = $value; } } $container = new MyContainer(); $container->set(DependencyInterface::class, new ConcreteDependency()); $myService = new MyService($container->get(DependencyInterface::class)); $myService->doSomething();</code>

By using the PSR-11 container interface, I not only simplified the process of dependency injection, but also ensured that my code is compatible with various container implementations. This greatly improves the flexibility and maintainability of the project.

In general, the PSR-11 container interface provides an efficient and standardized dependency management solution through the installation and use of Composer. If you encounter similar dependency injection problems in development, try using the PSR-11 container interface and Composer to simplify your development process.

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