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Before installing symfony, you need to choose the version you want to use for your projects. All legacy versions of symfony are also downloadable.

At a Glance

symfony 1.4 The current Long Term Support stable release (for new projects) - Maintainted until November 2012
This stable version has been released at the end of November 2009. This is the recommended version to use for all new projects. This version is the current LTS release (Long Term Support).
Symfony 2.0 The next major release
Symfony 2.0 is the next major release of the Symfony framework.

The Choice Matrix

symfony 1.4 Symfony 2.0
Stability Stable Stable
Release date 11/2009 07/2011
Latest 1.4.16 2.0.0
Support3 yearsn/a
PHP version>= 5.2.4>= 5.3.2
ORM versions Propel: 1.4
Doctrine: 1.2		 Doctrine: 2.1
End of maintenance11/2012n/a
How to upgrade Changelog for 1.4.X
 n/a
Documentation Documentation Documentation
Installation Detailed instructions Detailed instructions
Download Source .tgz, .zip
Sandbox .tgz, .zip 		Detailed instructions
Main Repository http://svn.symfony-project.com/branches/1.4 http://github.com/symfony/symfony.git
* Stable: The symfony team is commited to fix bugs and security problems for stable releases until the end of the maintenance. In average, we release a bug fix version a month. These versions never contain new features, even small ones, but only bug fixes. So, they are always backward compatible, easy and safe to upgrade to.