title: Zend how to use cache component
body: <p>Let's say you have this scenario:a simple blog home-page that loads both static content as well as dynamic content.
  The static content is composed of images that rarely changes.I also have database-driven,dynamic content.The dynamic content consists in all of your blog posts (text and image) and related users comments.The dynamic content changes periodically from every hour to every day.</p>
  
  <p>How would you go with caching?And in particular supposing a user is leaving a comment or the admin is adding/editing a post to you would want to manually trigger the cache clearing to have the update version of this blog home-page?</p>
  
  <p>thanks for your patience.</p>
  
  <p>Luca</p>
  
  <p>thanks again</p>