Kernel Docs

sympress/kernel is a WordPress kernel built on symfony/dependency-injection. It boots exactly one global site-level container, discovers active MU plugins, plugins, and themes as bundles, and imports their Resources/config/ directories into that same container.

The current kernel targets Symfony DependencyInjection ^8.1. It keeps the WordPress-specific pieces small: package discovery, runtime hydration, hook registration, and WP-CLI bridging. Bundle lifecycle, configurable extensions, service locators, tagged iterators, resettable services, and most attributes use the original Symfony component behavior.

Contents

• boot-and-bundles.md
• services-and-autowiring.md
• dependency-injection.md
• attributes.md
• hooks.md
• routing.md
• showcase-plugin.md

Guiding Principles

• bundles instead of service providers
• a global Symfony container instead of isolated plugin containers
• Resources/config/services.yaml as the primary source of truth
• attributes only where they usefully complement YAML definitions
• Symfony DI attributes such as #[AutowireIterator] and #[AutowireLocator] without kernel-specific wrappers
• declarative WordPress hooks through kernel.hook or #[AsHook]
• controller routes through #[Route], with format: 'json' used for WordPress REST endpoint registration