Symfony 4 has been released a month ago; the latest major version of symfony 1 was released
8 years ago.
Its end of life was reached 5 years ago.
Why a blog post about symfony 1 then? Because SensioLabs is still maintaining
the symfony 1 infrastructure: mainly the subversion server and the plugin
platform. I think it's time to move on and sunset the platform. We will shut
down the Symfony 1 infrastructure at the end of February 2018. If there is
enough interest, we will probably keep the API documentation and downloadable
artefacts somewhere on symfony.com. But you won't be able to start new projects
via Subversion or install new plugins. Note that existing projects won't be
affected in any way.