title: PHP form that loads content based on dropdown option
body: <p>I have already asked a question regarding this issue <a href="https://stackoverflow.com/questions/24598569/mutilple-pages-in-a-form">here</a>, for a client project. Those answers may not be what I am looking for, so I will try to make this question as detailed as possible.</p>
  
  <p>I have a form which has 4 main pages. The first page asks for personal information. Clicking on Submit takes you to a second page. Second page has a dropdown list containing item numbers. Let's say they are A, B, C, D, E.</p>
  
  <p>When a visitor chooses an item and clicks submit, I want the next page to show content based on the item chosen above:</p>
  
  <ul>
  <li>If visitor chooses option A, the page should load the html page <strong>a.html</strong> or php page <strong>a.php</strong>.</li>
  <li>If he selects option B, the page should load the html page <strong>b.html</strong> or php page <strong>b.php</strong>. And so on for other items, each one having a different page.</li>
  </ul>
  
  <p>I don't know PHP in detail. I am building this form in a website on WordPress.</p>