Warning: You are browsing the documentation for Symfony 2.8, which is no longer maintained.
Read the updated version of this page for Symfony 5.3 (the current stable version).
Requirements for Running Symfony
Symfony 2.8 requires PHP 5.3.9 or higher to run, in addition to other minor requirements. To make things simple, Symfony provides a tool to quickly check if your system meets all those requirements.
Beware that PHP can define a different configuration for the command console and the web server, so you need to check requirements in both environments.
Checking Requirements for the Web Server
Symfony includes a config.php file in the web/ directory of your project.
Open that file with your browser to check the requirements.
Once you've fixed all the reported issues, delete the web/config.php file
to avoid leaking internal information about your application to visitors.
Checking Requirements for the Command Console
Open your console or terminal, enter in your project directory, execute this command and fix the reported issues:
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$ cd my-project/
$ php app/check.php