Charset

type: string default: UTF-8

This returns the charset that is used in the application. To change it, override the getCharset() method and return another charset, for instance:

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// src/Kernel.php
use Symfony\Component\HttpKernel\Kernel as BaseKernel;
// ...

class Kernel extends BaseKernel
{
    public function getCharset()
    {
        return 'ISO-8859-1';
    }
}

Kernel Name

type: string default: src (i.e. the directory name holding the kernel class)

To change this setting, override the getName() method. Alternatively, move your kernel into a different directory. For example, if you moved the kernel into a foo/ directory (instead of src/), the kernel name will be foo.

The name of the kernel isn't usually directly important - it's used in the generation of cache files - and you probably will only change it when using applications with multiple kernels.

Project Directory

type: string default: the directory of the project composer.json

This returns the root directory of your Symfony project. It's calculated as the directory where the main composer.json file is stored.

If for some reason the composer.json file is not stored at the root of your project, you can override the getProjectDir() method to return the right project directory:

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// src/Kernel.php
use Symfony\Component\HttpKernel\Kernel as BaseKernel;
// ...

class Kernel extends BaseKernel
{
    // ...

    public function getProjectDir()
    {
        return realpath(__DIR__.'/../');
    }
}

Cache Directory

type: string default: $this->rootDir/cache/$this->environment

This returns the path to the cache directory. To change it, override the getCacheDir() method. Read "How to Override Symfony's default Directory Structure" for more information.

Log Directory

type: string default: $this->rootDir/log

This returns the path to the log directory. To change it, override the getLogDir() method. Read "How to Override Symfony's default Directory Structure" for more information.