Full-stack PHP framework developed by SensioLabs offering modular architecture based on reusable components. Solid design patterns (MVC, Dependency Injection), extensible bundle system, powerful Doctrine ORM and rich ecosystem for building scalable and maintainable web applications.
Modern PHP with strict typing, PHP 8+ attributes and PSR-4 autoloading
MVC architecture with controllers, routes and Twig template engine
Native Dependency Injection with autowiring and YAML/XML/PHP configuration
Doctrine ORM with entities, repositories, migrations and DQL
Reusable bundles for modularity and code organization
Symfony Console for CLI commands and automated scripts
Security component for authentication, authorization and firewall
Form component with validation, CSRF protection and theming
Messenger component for async/queue with transports (RabbitMQ, Redis)
Comprehensive testing (PHPUnit, functional tests, Panther for E2E)
The most important concepts to understand this technology and ace your interviews
PHP: namespaces, PSR-4 autoloading, traits, interfaces, strict typing PHP 8+
Symfony architecture: HttpKernel, Request/Response cycle, events, kernel listeners
Controllers: routing, annotations/attributes, request parameters, response types
Routing: YAML/annotations/attributes, route parameters, requirements, prefixes
Dependency Injection: services, autowiring, service container, compiler passes
Doctrine ORM: entities, annotations/attributes, associations (@OneToMany, @ManyToOne)
Doctrine repositories: custom queries, QueryBuilder, DQL (Doctrine Query Language)
Migrations: DoctrineMigrationsBundle, versioning, up/down migrations
Twig: template syntax, filters, functions, inheritance (extends, block), includes
Forms: FormType, form builders, validation constraints, custom form types
Validation: constraint annotations (@NotBlank, @Email), custom validators, groups
Security: authentication providers, voters, firewalls, role hierarchy, remember me
Events: EventDispatcher, event subscribers, kernel events (request, response, exception)
Serializer: normalization, denormalization, groups, custom normalizers, formats (JSON, XML)
Messenger: message handlers, transports, async processing, retry strategies
Console: commands (Command class), input/output, helpers, progress bars
HTTP Client: HttpClient component, requests, authentication, retry mechanism
Cache: cache pools, cache tags, adapters (Redis, APCu, Filesystem)
Bundles: bundle structure, extension class, configuration, third-party bundles
Testing: PHPUnit, WebTestCase, functional tests, fixtures, mocking
Performance: profiler, caching strategies, lazy loading, opcache, preloading PHP 8
API Platform: REST/GraphQL APIs on top of Symfony, serialization, filters, pagination
Deployment: Symfony CLI, environment variables (.env), Docker, composer optimize
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