title: Passing POST variable into two pages back and forth
body: <p>I have a scenario here in which I am confused to solve. So here is the matter,</p>
  
  <ol>
  <li>I have a PHP page with the project selector that gives the value into monitorIndex.php</li>
  <li><p>And in the monitorIndex.php im using that given value with this </p>
  
  <p>if(isset( $_POST['cd-dropdown'])) $_SESSION['cd-dropdown'] = $_POST['cd-dropdown'];</p></li>
  </ol>
  
  <p>in which I use $_POST['cd-dropdown'] as the value used everywhere</p>
  
  <p>now my question is, when user click on the navigation menu to go to a page called monitorTable.php, how do I still use the $_POST['cd-dropdown'] ? and how to make variable alive when user navigate out from that page and go back to monitorIndex.php and keeping the $_POST['cd-dropdown'] alive</p>
  
  <p>thank you so much</p>