将变量传递并设置给所有控制器- Symfony4

<?php

namespace App\Event;

use Symfony\Component\EventDispatcher\Event;

class VariableEvent extends Event
{
    private $variable;

    public function __construct($variable)
    {
        $this->variable = $variable;
    }

    public function getVariable()
    {
        return $this->variable;
    }
}

<?php

namespace App\EventListener;

use App\Event\VariableEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\ControllerEvent;
use Symfony\Component\HttpKernel\KernelEvents;

class VariableListener implements EventSubscriberInterface
{
    private $variable;

    public function __construct($variable)
    {
        $this->variable = $variable;
    }

    public function onKernelController(ControllerEvent $event)
    {
        $controller = $event->getController();
        $this->setVariable($controller);
    }

    public function setVariable($controller)
    {
        if (is_array($controller)) {
            $controller[0]->setVariable($this->variable);
        } else {
            $controller->setVariable($this->variable);
        }
    }

    public static function getSubscribedEvents()
    {
        return [
            KernelEvents::CONTROLLER => 'onKernelController',
        ];
    }
}

services:
    App\EventListener\VariableListener:
        arguments:
            $variable: 'your_variable_value'
        tags:
            - { name: kernel.event_subscriber }

    App\Event\VariableEvent: ~