AppKernel.php

<?php

use Symfony\Component\Config\Loader\LoaderInterface;
use Symfony\Component\HttpKernel\Kernel;

abstract class AppKernel extends Kernel
{
    /**
     * Returns unique app name
     * @return string
     */
    abstract public function getAppName();

    public function registerBundles()
    {
        $bundles = [
            new Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
            new Symfony\Bundle\SecurityBundle\SecurityBundle(),
            new Symfony\Bundle\MonologBundle\MonologBundle(),
            new Doctrine\Bundle\DoctrineBundle\DoctrineBundle(),
            new Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle(),
            new AppBundle\AppBundle(),
        ];

        if (in_array($this->getEnvironment(), ['dev', 'test'], true)) {
            $bundles[] = new Symfony\Bundle\DebugBundle\DebugBundle();
            $bundles[] = new Symfony\Bundle\WebProfilerBundle\WebProfilerBundle();
            $bundles[] = new Sensio\Bundle\DistributionBundle\SensioDistributionBundle();
            $bundles[] = new Sensio\Bundle\GeneratorBundle\SensioGeneratorBundle();
        }

        return $bundles;
    }

    public function getRootDir()
    {
        return __DIR__;
    }

    public function getCacheDir()
    {
        return dirname(__DIR__) . '/var/cache/' . $this->getAppName() . '/' . $this->getEnvironment();
    }

    public function getLogDir()
    {
        return dirname(__DIR__) . '/var/logs/' . $this->getAppName();
    }

    protected function getKernelParameters()
    {
        $parameters = parent::getKernelParameters();

        return array_merge_recursive($parameters, [
            'kernel.multiple_root_dir' => $parameters['kernel.root_dir'] . '/config/' . $this->getAppName(),
            'kernel.app_name' => $this->getAppName(),
        ]);
    }

    public function registerContainerConfiguration(LoaderInterface $loader)
    {
        $configurationPath = sprintf(
            '%s/config/%s/config_%s.yml',
            $this->getRootDir(),
            $this->getAppName(),
            $this->getEnvironment()
        );

        $loader->load($configurationPath);
    }
}