Symfony AppKernel cache and log directories change

AppKernel.php

<?php

public function getCacheDir()
{
    if (in_array($this->environment, array('dev', 'test'))) {
        return '/dev/shm/votre_appli/cache/' .  $this->environment;
    }

    return parent::getCacheDir();
}

public function getLogDir()
{
    if (in_array($this->environment, array('dev', 'test'))) {
        return '/dev/shm/votre_appli/logs';
    }

    return parent::getLogDir();
}