title: What keeps a php session alive?
body: <p>Are sessions only kept alive each time you access a page with <code>session_start();</code> or do other pages keep it alive too?</p>
  
  <p>Example (with <strong>30 minute</strong> timeout):</p>
  
  <h2>1</h2>
  
  <blockquote>
    <p>user accesses page with session_start();<br>
    25 mins later they access another session_start();<br>
    page session stays alive</p>
  </blockquote>
  
  <h1>2</h1>
  
  <blockquote>
    <p>user accesses page with session_start();<br>
    25 mins later they access a non-session_start(); page<br>
    session stays alive</p>
  </blockquote>
  
  <p>Is <strong>2</strong> also true ?</p>