PHP full-stack web framework
Symfony is a full-stack PHP framework (with reusable components) for building web and console applications.
Same problem, same approach. Swapping one for another is a config change, not a rewrite.
A full-stack PHP framework of the same class; choose it if you prefer integrated ActiveRecord and Gii scaffolding over Symfony's component-based setup.
Yii 2: The Fast, Secure and Professional PHP Framework
Solves the same problem with a different architecture or at a different layer. Expect to rewrite the integration.
A Ruby full-stack web framework; choose it only if you are willing to develop in Ruby instead of PHP, gaining strong convention-over-configuration.
Ruby on Rails
A lightweight PHP micro-framework; choose it for small APIs or apps that don't need Symfony's full stack and want a far lighter runtime.
Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs.
These projects were analysed and named symfony among their alternatives. The relationship is not symmetric — how symfony rates them is a separate judgement, made when symfony is analysed in its own right.
calls symfony “Full-stack PHP framework with component-based architecture; choose if you need long-term enterprise conventions and don't mind a steeper learning curve.”
Laravel is a web application framework with expressive, elegant syntax. We’ve already laid the foundation for your next big idea — freeing you to create without sweating the small things.
calls symfony “same full-stack PHP role; choose if you prefer Symfony's modular components and DI ecosystem over Yii's integrated approach.”
Yii 2: The Fast, Secure and Professional PHP Framework
calls symfony “Same job as a PHP MVC framework but with different architecture and bundles; choose for Symfony-style projects.”
Laravel is a web application framework with expressive, elegant syntax.
calls symfony “Choose Symfony for a full-stack PHP ecosystem with reusable components and more structure than Slim's micro core.”
Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs.