title: How to delete $_POST variable upon pressing 'Refresh' button on browser with PHP?
body: <p>When I press the 'refresh' button on my browser, it seems that <code>$_POST</code> variable is preserved across the refresh.</p>
  
  <p>If I want to delete the contents of <code>$_POST</code> what should I do? Using <code>unset</code> for the fields of <code>$_POST</code> did not help.</p>
  
  <p>Help? Thanks!</p>