title: The memcache extension must be loaded for using this backend
body: <p>I got memcached installed. This is from phpinfo():</p>
  
  <p><img src="https://i.stack.imgur.com/NUnIw.png" alt="enter image description here"></p>
  
  <p>But when using it like this:</p>
  
  <pre><code>private static function getZendCacheMemcachedObject()
  {
      $frontendOpts = array(
          'caching' =&gt; true,
          'lifetime' =&gt; 3600,
          'automatic_serialization' =&gt; true
      );
  
      $backendOpts = array(
          'servers' =&gt;array(
              array(
              'host'   =&gt; 'localhost',
              'port'   =&gt; 11211,
              'weight' =&gt; 1
              )
          ),
          'compression' =&gt; false
      );
  
      return Zend_Cache::factory('Core', 'Memcached', $frontendOpts, $backendOpts);
  }
  
  public function foo($id)
  {
      $cache = self::getZendCacheMemcachedObject();
      $cacheKey = 'foo_'.$id;
      $xml = $cache-&gt;load($cacheKey);
  
      if (false === $xml) {
          $xml = $this-&gt;httpClient-&gt;foo();
          $cache-&gt;save($xml, $cacheKey);
      }
  
      return $xml;
  }
  </code></pre>
  
  <p>I get this error:</p>
  
  <pre><code>The memcache extension must be loaded for using this backend
  </code></pre>
  
  <p>Any ideas?</p>