title: How to judge whether <input type="checkbox" /> is checked on with PHP?
body: <pre><code>&lt;form method="POST"&gt;
  
      &lt;input type="checkbox" id="hrm" name="hrm" /&gt;
  
  &lt;/form&gt;
  </code></pre>
  
  <p>I mean when the form is posted.</p>