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These are the technical requirements to run Symfony 4 applications:
- PHP version: 7.1.3 or higher
PHP extensions: (all of them are installed and enabled by default in PHP 7+)
Writable directories: (must be writable by the web server)
To make things simple, Symfony provides a tool to quickly check if your system meets these requirements. In addition, the tool provides recommendations if applicable.
Run this command to install the tool:
$ cd your-project/ $ composer require symfony/requirements-checker
Beware that PHP may use different configurations for the command console and the web server, so you need to check the requirements in both environments.
The requirements checker tool creates a file called
check.php in the
public/ directory of your project. Open that file with your browser to check
Once you've fixed all the reported issues, uninstall the requirements checker to avoid leaking internal information about your application to visitors:
$ cd your-project/ $ composer remove symfony/requirements-checker
The requirements checker tool adds a script to your Composer configuration to check the requirements automatically. There's no need to execute any command; if there are any issues, you'll see them in the console output.