src/Container/README.md
The Container library provides a PSR-11 compatible dependency injection container for defining application services and resolving their dependencies.
Services can be defined with concrete classes, shared instances, factory functions, or interface mappings:
use App\Service\AuditLogService;
use App\Service\AuditLogServiceInterface;
use App\Service\ApiClient;
use App\Service\BillingService;
use Cake\Container\Container;
$container = new Container();
// Add a concrete class.
$container->add(BillingService::class);
// Add a singleton service.
$container->addShared('apiClient', fn () => new ApiClient('https://example.com'));
// Add an implementation for an interface.
$container->add(AuditLogServiceInterface::class, AuditLogService::class);
$billing = $container->get(BillingService::class);
Definitions can also have arguments, tags, and service providers attached when your application needs more control over how objects are built.
Please make sure you check the official documentation