Symfony2 is a PHP 5.3 full-stack web framework. It is written with speed and flexibility in mind. It allows developers to build better and easy to maintain websites with PHP.
Symfony can be used to develop all kind of websites, from your personal blog to high traffic ones like Dailymotion or Yahoo! Answers.
Symfony2 is only supported on PHP 5.3.3 and up.
Be warned that PHP versions before 5.3.8 are known to be buggy and might not work for you:
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before PHP 5.3.4, if you get "Notice: Trying to get property of non-object", you've hit a known PHP bug (see https://bugs.php.net/bug.php?id=52083 and https://bugs.php.net/bug.php?id=50027);
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before PHP 5.3.8, if you get an error involving annotations, you've hit a known PHP bug (see https://bugs.php.net/bug.php?id=55156).
The best way to install Symfony2 is to download the Symfony Standard Edition available at http://symfony.com/download.
The "Quick Tour" tutorial gives you a first feeling of the framework. If, like us, you think that Symfony2 can help speed up your development and take the quality of your work to the next level, read the official Symfony2 documentation.
Symfony2 is an open source, community-driven project. If you'd like to contribute, please read the Contributing Code part of the documentation. If you're submitting a pull request, please follow the guidelines in the Submitting a Patch section.
Information on how to run the Symfony2 test suite can be found in the Running Symfony2 Tests section.