title: session_start() is generating the same session id everytime
body: <p>I am trying to implement simple login and logout mechanism. When the user logs in I am creating the session by using <code>session_start()</code>. and upon the user logging out I am calling</p>
  
  <pre><code>session_unset();
  session_destroy();
  </code></pre>
  
  <p>but the problem is that after logging out next time if again login. <code>the session_id()</code> is same as previous. No matter how much I do the <code>session_destroy()</code>, the <code>session_id()</code> is always the same. Does it mean <code>session_destroy()</code> is not working? Or there is some other reason?</p>