title: Numeric Captcha for PHP
body: <h2>Is there a <strong>numeric</strong> captcha available for <strong>PHP</strong>?</h2>
  <p>(<em>which doesn't rely on JavaScript being turned on</em>)</p>
  <hr />
  <p>EDIT:</p>
  <ul>
  <li>I know there are JS-independent
  captchas out there.</li>
  <li>I know there
  are PHP captchas out there.</li>
  <li>I know
  there are numeric captchas out there.</li>
  </ul>
  <p>But I'm looking for a <strong>PHP numeric Javascript-independent</strong> captcha.<br />
  The only numeric captcha's I've found are either for ASP.NET or jQuery/JS based ones.<br />
  I don't want any of those as an answer to the question.</p>
  <p>And I'm not taking about a small website here. In the answer I'd like to know whether your suggestion puts a lot of strain on the server or not.</p>