[Twig] Refreshing modified Templates when OPcache or APC is enabled.

AppBundle.php

<?php

/**
* @file src/AppBundle/AppBundle.php
*/

namespace AppBundle;

use AppBundle\DependencyInjection\Compiler\TwigCacheFileSystemPass;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\HttpKernel\Bundle\Bundle;

class AppBundle extends Bundle
{
    public function build(ContainerBuilder $container)
    {
        $container->addCompilerPass(new TwigCacheFileSystemPass());
    }
}

TwigCacheFileSystemPass.php

<?php 

/**
* @file src/AppBundle/DependencyInjection/Compiler/TwigCacheFileSystemPass.php
*/

/** 
* When using OPcache with opcache.validate_timestamps set to 0 or APC with apc.stat set to 0 and Twig cache enabled, 
* clearing the template cache won't update the cache. To get around this, force Twig to invalidate the bytecode cache. 
*/

namespace AppBundle\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Definition;
use Symfony\Component\DependencyInjection\Reference;

/**
 * Class TwigCacheFileSystemPass
 * @package AppBundle\DependencyInjection\Compiler
 */
class TwigCacheFileSystemPass implements CompilerPassInterface
{
    /**
     * You can modify the container here before it is dumped to PHP code.
     *
     * @param ContainerBuilder $container
     */
    public function process(ContainerBuilder $container)
    {
        if (false === $container->hasDefinition('twig')) {
            return;
        }

        // AppBundle\Twig\Cache\TwigCacheForceByteCodeRefreshFactory factory.
        $container->register(
          'app.twig.fileSystem_cache_refresh_factory',
          'AppBundle\Twig\Cache\TwigCacheForceByteCodeRefreshFactory'
        )
          ->addArgument($container->getParameter('kernel.cache_dir').'/twig')
          ->setPublic(false);

        /** @var Definition $twigCacheFileSystem */
        $twigCacheFileSystem = (
        new Definition(
          'Twig_Cache_Filesystem'
        )
        )
          ->setPublic(false)
          ->setFactory(
            array(
              new Reference('app.twig.fileSystem_cache_refresh_factory'),
              'factory',
            )
          );

        $options = array('cache' => $twigCacheFileSystem);

        /** @var Definition $twigDef */
        $twigDef = $container->findDefinition('twig');

        $twigDef->replaceArgument(
          1,
          array_merge((array)$twigDef->getArgument(0), $options)
        );
    }
}

TwigCacheForceByteCodeRefreshFactory.php

<?php

/**
* @file src/AppBundle/Twig/Cache/TwigCacheForceByteCodeRefreshFactory.php
*/

namespace AppBundle\Twig\Cache;

/**
 * Class TwigCacheForceByteCodeRefreshFactory
 * @package AppBundle\Twig\Cache
 */
class TwigCacheForceByteCodeRefreshFactory
{
    private $cacheDir;

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

    /**
     * @return \Twig_Cache_Filesystem
     */
    public function factory()
    {
        return new \Twig_Cache_Filesystem(
          $this->cacheDir,
          \Twig_Cache_Filesystem::FORCE_BYTECODE_INVALIDATION
        );
    }
}

It's weird that it's not yet a setting inside twig bundle.

I've forked it to work with Symfony 5, but I did not see any improvement: the cache is still not cleared on restart (ap hosted on Platform.sh).

Looking for a trick 😒