The core difference is the minimum PHP version and a cleanup of deprecated code: Symfony 6 requires PHP 8.0 or higher, while Symfony 5 supported PHP starting from 7.2.5. Because Symfony marks features as deprecated one major version before removing them, Symfony 6 strips out everything that was flagged as deprecated throughout the 5.x line, which is the change that breaks upgrades if it is skipped. Symfony also follows a time-based release cycle, with a new minor version roughly every six months, so Symfony 6 arrived as the regular next major step rather than a rewrite.
Related Symfony Questions And Answers
- What is Symfony used for?
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