title: Caching in Symfony 3 on PHP 5.6
body: <p>As APC is considered deprecated, I'd like to move my Symfony application away from it. However the Symfony documentation still heavily refers to it. </p>
  
  <p>Am I correct in thinking that I still need a caching mechanism such as APCu, as PHP 5.6 opcache <a href="https://serverpilot.io/community/articles/how-to-install-the-php-apcu-extension.html" rel="nofollow">only provides bytecode caching</a> (and not a key-value store)? If so, are these config values still necessary?</p>
  
  <pre><code>doctrine:
     orm:
         metadata_cache_driver: apc
         result_cache_driver: apc
         query_cache_driver: apc
  
  framework:
     serializer:
         cache: serializer.mapping.cache.apc
  </code></pre>
  
  <p>I can't find any mention of APCu in the <a href="http://symfony.com/doc/current/reference/configuration/doctrine.html#caching-drivers" rel="nofollow">caching drivers documentation</a>.</p>