memcache.php

$app['cache'] = $app->share(
  function (Application $app) {
      $memcache = new Memcache();
      $memcache->connect('127.0.0.1', 11211);
      $cacheDriver = new \Doctrine\Common\Cache\MemcacheCache();
      $cacheDriver->setMemcache($memcache);
      
      return $cacheDriver;
    }
  );
);