title: How do I negate this if/else comparison to just if?
body: <p>I'm trying to set the class hidden, unless two factors are met. Currently, I'm using the code below:</p>
  
  <pre><code>&lt;?php 
  if (isset($_POST['prerequisite']) &amp;&amp; $form == "CheckingIn")
  {
  
  }
  else
  {
      echo "hidden";
  }
  ?&gt;
  </code></pre>
  
  <p>How can I fix this to just be an if statement instead of an if/else?</p>