Symfony 7.3 adds better exception logging, enum support in config, native PHP 8.4 lazy objects, and key-based query mapping for improved DX.

Symfony 7.3 brings DX improvements like full Twig deprecation reporting, PascalCase string support, new form helpers, union types in OptionsResolver and a DatePoint Doctrine Type.

Symfony 7.3 introduces validation improvements including better When constraint, deprecations for array-based options, and enhanced file, image, and uniqueness constraints.

Symfony 7.3 improves the Serializer component with new features like number normalization, discriminator defaults, and better debug output.

Symfony 7.3 introduces new bridges and improves existing integrations with services like Amazon SES, Beanstalkd, Redis, and more.

Symfony 7.3 improves Messenger with deduplication middleware, running processes using the shell, and keepalive for Doctrine transport.

Symfony 7.3 routing simplifies controller detection, adds route aliases in attributes, and introduces parameter aliases.

In Symfony 7.3, the new JsonStreamer component provides a high-performance, low-memory solution for encoding and decoding JSON at scale.

Symfony 7.3 adds YAML flags to force quoted strings, compact nested maps, and dump empty entries.

Symfony 7.3 adds service closure shortcuts, resource tags, and environment-aware aliases to streamline your service configuration.