symfony 4 : How to get "/public" from RootDir - symfony

Question

I have an image under the public folder.
How can I get my image directory in symfony4 ?
In symfony 3, it's equivalent is :
$webPath = $this->get('kernel')->getRootDir() . '/../web/';

Answer 1

It is a bad practice to inject the whole container, just to access parameters, if you are not in a controller. Just auto wire the ParameterBagInterface like this,
protected $parameterBag;
public function __construct(ParameterBagInterface $parameterBag)
{
$this->parameterBag = $parameterBag;
}
and then access your parameter like this (in this case the project directory),
$this->parameterBag->get('kernel.project_dir');
Hope someone will find this helpful.
Cheers.

Answer 2

You can use either
$webPath = $this->get('kernel')->getProjectDir() . '/public/';
Or the parameter %kernel.project_dir%
$container->getParameter('kernel.project_dir') . '/public/';

Answer 3

In Controller (also with inheriting AbstractController):
$projectDir = $this->getParameter('kernel.project_dir');

Answer 4

In config/services.yaml:
parameters:
webDir: '%env(DOCUMENT_ROOT)%'
In your controller:
use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
...
public function yourFunction(Parameterbag $parameterBag)
{
$webPath = $parameterBag->get('webDir')
}
If you need to access a directory within public, change the last line to the following:
$webPath = $parameterBag->get('webDir') . '/your/path/from/the/public/dir/'

Answer 5

You can inject KernelInterface to the service or whatever and then get the project directory with $kernel->getProjectDir():
<?php
namespace App\Service;
use Symfony\Component\HttpKernel\KernelInterface;
class Foo
{
protected $projectDir;
public function __construct(KernelInterface $kernel)
{
$this->projectDir = $kernel->getProjectDir();
}
public function showProjectDir()
{
echo "This is the project directory: " . $this->projectDir;
}
}

Answer 6

Starting from Symfony 4.3 we can generate absolute (and relative) URLs for a given path by using the two methods getAbsoluteUrl() and getRelativePath() of the new Symfony\Component\HttpFoundation\UrlHelper class.
New in Symfony 4.3: URL Helper
public function someControllerAction(UrlHelper $urlHelper)
{
// ...
return [
'avatar' => $urlHelper->getAbsoluteUrl($user->avatar()->path()),
// ...
];
}

Answer 7

All above answers seems valid, but I think it's simplier if you configure it as parameter in services.yaml
If you need to use it in serveral services, you can bind it like this:
# services.yaml
services:
_defaults:
autowire: true
autoconfigure: true
bind:
$publicDir: "%kernel.project_dir%/public"
# src/Services/MyService.php
class MyService
{
public function __construct(
private string $publicDir,
) {
}
// …
}
This way, this is configured at one place only, and if later you decide to change /public to something else, you will have to change it only in .yaml file.
If you don't need the root directory but a subdirectory, it might be better to define the final target path: This way you will be more flexible if you need later to move only that directory, like $imageDir or $imagePath (depends if you will use the full directory or only the public path).
Note also the default public path is defined in composer.json file, in the extra.public-dir key