title: Form field with decimal value shows as empty in $_POST
body: <p>I have a form field that looks like this:</p>
  
  <pre><code>&lt;input type="hidden" name="last_amount_paid" value="&lt;?php echo $amount; ?&gt;"&gt;
  </code></pre>
  
  <p><code>$amount</code> is set to 100.00 and shows up fine if I change the form field from hidden to text.</p>
  
  <p><code>$_POST['last_amount_paid ']</code> is empty when I try and retrieve the value after submit.</p>
  
  <p>I ran <code>var_dump($_POST)</code>; and it's showing up as a string and empty</p>
  
  <pre><code>["last_amount_paid"]=&gt; string(0) ""
  </code></pre>
  
  <p>Any ideas?</p>