Getting Started

Install the 2.0 release with composer require vendor/package:^2.0. Laravel package auto-discovery should register the service provider; if not, add it to config/app.php.
Publish any package configuration with php artisan vendor:publish --provider="Vendor\Package\ServiceProvider" and review config/symfony.php (or similarly named config) for Symfony‑specific parameters.
First use case: bridge Symfony 3 components into Laravel. For example, resolve a Symfony service from Laravel’s container, dispatch a Symfony event alongside Laravel events, or register a Symfony Console command. Start by reading the package’s README and the service provider to see which Symfony services are bound.
Confirm your environment meets Symfony 3 requirements: PHP >= 5.5.9 (Laravel 5.1+ is fine). If you are upgrading from 1.x, treat 2.0 as a breaking change because Symfony 2 components are no longer supported.

Implementation Patterns

Container bridging: Use Laravel’s service container to resolve Symfony services. The package typically binds Symfony classes as singletons or aliases. Inject them into controllers, jobs, or commands via constructor injection.
Event integration: If the package provides an event dispatcher bridge, dispatch Symfony events from Laravel code and listen to them using Laravel’s event system (or vice versa). Register listeners in EventServiceProvider as usual.
Console commands: Register Symfony Console commands through the package’s service provider or by tagging them in Laravel’s container. This is useful when reusing existing Symfony commands inside Laravel’s artisan workflow.
Configuration mapping: Map Laravel config values to Symfony parameters in a service provider’s register or boot method. Use config('symfony.*') to feed Symfony components that expect parameter bags.
Workflow tip: Keep Symfony‑specific logic behind interfaces or dedicated service classes. This makes it easier to swap implementations or upgrade Symfony versions later without scattering Symfony types across your Laravel codebase.
Integration tip: When mixing Laravel and Symfony components, prefer Laravel’s facades and helpers for framework concerns (config, logging, HTTP) and use Symfony components only for the specific functionality they provide (e.g., Process, Console, EventDispatcher).

Upgrade pitfall: 2.0 adds Symfony 3 support but drops Symfony 2. If your code or other dependencies rely on Symfony 2 APIs, you must update them. Check for removed or renamed methods in Symfony components you use (e.g., Console, Process).
PHP version: Symfony 3 requires PHP >= 5.5.9. Ensure your Laravel version and hosting environment meet this. Older Laravel 5.0 projects may need an upgrade.
Config caching: After publishing config or changing Symfony parameters, run php artisan config:clear. Symfony components may read parameters at container build time, so stale config can cause confusing errors.
Debugging: If a Symfony service is not resolvable, inspect the package’s service provider bindings with php artisan tinker and app()->make(YourSymfonyClass::class). Check provider registration order—Laravel resolves bindings in the order they are registered.
Extension points: You can override package bindings by re‑binding interfaces in your own service provider’s register method. Use Laravel’s $this->app->extend() to decorate Symfony services without forking the package.
Long‑term note: Symfony 3 is end‑of‑life. Plan for a future upgrade path if the package adds Symfony 4/5 support, or isolate Symfony usage so it can be replaced.