关于Drupal 8基础框架的技术问询：基于Symfony、自定义还是融合？
Awesome question—this is a common point of confusion for developers new to Drupal 8, especially if you’re coming from older Drupal versions. Let’s break it down clearly:
Symfony is the foundational backbone
Drupal 8 made a massive shift from Drupal 7’s entirely custom stack by building core around key Symfony components. Critical systems like the HTTP kernel, routing engine, dependency injection container, and event dispatcher are directly pulled from Symfony. This wasn’t just a small tweak—it meant Drupal could leverage Symfony’s mature, enterprise-grade tools to improve performance, security, and extensibility right out the gate.Custom Drupal components handle CMS-specific needs
That doesn’t mean Drupal abandoned its own identity, though. It retained and evolved custom-built components tailored to solve the unique challenges of a content management system, including:- The entity system (for managing nodes, users, taxonomy terms, and other content types)
- The plugin system (a flexible way to add functionality across modules, themes, and core)
- Drupal’s extended Twig theming layer (Twig is a Symfony component, but Drupal adds custom filters, functions, and structure made for CMS workflows)
- A refined hook system (still used for certain CMS-specific tasks, even as Symfony’s event system took over many cross-cutting responsibilities)
The short answer: It’s a hybrid framework
To put it simply, Drupal 8 isn’t purely a Symfony-based app, nor is it a fully custom framework. It’s a blend—using Symfony as its core foundation to avoid reinventing the wheel, then layering on Drupal’s own specialized tools to deliver the content management features that make it a go-to CMS.
As you noticed in that article you read, Symfony plays a huge role here, but it’s far from the entire story.
内容的提问来源于stack exchange，提问作者Varun Malhotra
