title: How can I tell which button was clicked in a PHP form submit?
body: <p>I have several buttons on my page, but I'm not sure how to tell which one was clicked.
  Here's the markup for my two buttons:</p>
  
  <pre><code>&lt;input type="submit" id="btnSubmit" value="Save Changes" /&gt;
  &lt;input type="submit" id="btnDelete" value="Delete" /&gt;
  </code></pre>