title: zend2: how to destroy exact session?
body: <p>I am new to Zend2. I dont know how to destroy the particular session.</p>
  
  <pre><code>$check_username = $session-&gt;offsetExists('sess_chk_usr_name');
  if(empty($check_username))
  {
     $session-&gt;offsetSet('sess_chk_usr_name', 'test user');
  }
  </code></pre>
  
  <p>I need to remove the session sess_chk_usr_name, please help. </p>