title: What happens if you assign a value to $_REQUEST?
body: <p>I recently came across this line in a PHP script:</p>
  
  <pre><code>$_REQUEST['start_date']=$date;
  </code></pre>
  
  <p>Is it allowed or useful in any way to assign something to the super global $_REQUEST variable?
  If there is a $_COOKIE['start_date'] will this change the cookie value?  </p>