Symfony 4, get the root path of the project from a custom class (not a controller class)

Question

In the src/Utils directory, I created a custom class Foo for various things. I\'m looking for a way to get the absolute root path of the symfony 4 project <

Answer 1

If your class is extending: Symfony\Bundle\FrameworkBundle\Controller\AbstractController, then you can get the root dir as

$projectRoot = $this->getParameter('kernel.project_dir');

or

Inject ContainerBagInterface to your controller

protected $projectRoot;

public function __construct(ContainerBagInterface $containerBag)
{
    $this->projectRoot = $containerBag->get('kernel.project_dir');;
}

or

Even better and the recommended approach

Inject the root_dir to your Foo class. Add the following to your config under services

services:
    foo:
        class:     App\Path\To\Foo
        arguments: ['%kernel.root_dir%']

The container should pass the argument to your class on resolving, the Foo class should look like this

rootDir = $rootDir;
  }
}