title: html/php form at least 1 field required
body: <p>I’m making a form which is used to order some products.</p>
  
  <p>However I have 11 fields where the customer can enter how many of that product they would like.</p>
  
  <pre><code> &lt;tr&gt;
      &lt;td&gt;Pizza Fungi&lt;/td&gt;
      &lt;td&gt;&lt;input type="text" name="PizzaFungi" size="3" maxlength="3"&gt;&lt;/td&gt;
   &lt;/tr&gt;
  </code></pre>
  
  <p>When they press submit it redirects to another page where all their info is shown – name, address, phone number, and finally the products they filled in.</p>
  
  <p>But that is my problem, when they fill in nothing it just redirects to the other page where nothing will show (obviously). </p>
  
  <p>What I need is some kind of validator in which I can select a group of fields. (only the items and not name, phone number etc.) And it will return an error of some kind.</p>
  
  <p>Thanks a lot in advance and if you miss any information, I’ll edit.</p>
  
  <p>EDIT: It’s not only 1 pizza – that is just 1 of the 11 products. How do I make it so that only 1 of those 11 is required?</p>