title: How to check if user is logged with Zend Framework?
body: <p>I'm learning Zend Framework, but I have some doubts about the usage and the concepts. </p>
  
  <p>I want to check if the user is logged to allow access to all the pages. If it is, show the page, if not, display the login the page.</p>
  
  <p>My main doubts are <strong>what I need to use to do this</strong> (Zend_Auth, Zend_Acl, etc) and <strong>where to check if the user is logged</strong> (in each controller or the framework automatically checks this for each requisition). </p>