PHP 함수 라이브러리를 생성하고 종속성 주입을 지원하도록 만드는 방법은 무엇입니까?

composer init

composer install

php
└── vendor
└── my-library
    └── src
        └── FunctionLibrary.php

namespace MyLibrary;

class FunctionLibrary
{
    public function greet(string $name): string
    {
        return "Hello, $name!";
    }
}

composer require php-di/phpdi

$containerBuilder = new \DI\ContainerBuilder();
$containerBuilder->addDefinitions([
    'MyLibrary\FunctionLibrary' => \DI\factory(function () {
        return new FunctionLibrary();
    })
]);

$container = $containerBuilder->build();

use MyLibrary\FunctionLibrary;
use DI\Container;

$container = new Container();

$functionLibrary = $container->get(FunctionLibrary::class);

echo $functionLibrary->greet('John'); // 输出：Hello, John!

namespace MyLibrary;

class UserRepository
{
    private $connection;

    public function __construct(\PDO $connection)
    {
        $this->connection = $connection;
    }

    public function persist(User $user): void
    {
        // 保存用户到数据库
    }
}

$containerBuilder->addDefinitions([
    \PDO::class => \DI\factory(function () {
        return new \PDO('mysql:host=localhost;dbname=my_database', 'username', 'password');
    }),
    'MyLibrary\UserRepository' => \DI\factory(function (Container $container) {
        return new UserRepository($container->get(\PDO::class));
    })
]);