title: changing value of isset
body: <p>I'm wondering if it's possible to manually change the value of an isset value. That is, to do something like this: </p>
  
  <pre><code>isset($_POST['search_user']) = true;
  </code></pre>
  
  <p>Why I want to do this: I have two different "submit" forms on one page. When one form is submitted, I want to capture all the values of that form into SESSION variables. However, when the other form is submitted, the SESSION variables are wiped out (since the first form is not, technically, submitted anymore).</p>
  
  <p>My idea was that, if the second form is submitted, then automatically set the value of the first form to true</p>