title: detect unchecked checkbox php
body: <p>Is there a way to check of a checkbox is unchecked with php? I know you can do a hidden field type in html but what about with just php when the form is submitted? I tried below no luck.</p>
  
  <pre><code>if(!isset($_POST['server'])||$_POST['server']!="yes"){
          $_POST['server']     == "No";
  }
  </code></pre>